Power Factor Correction Using Boost Converter Technique Engineering Essay

Power Factor Correction Using Boost Converter Technique Engineering Essay This paper researches a design a single phase rectifier with improved power factor by using the boost converter technique. This paper presents the use of boost converter technique can improve the power factor. By designing the needs of the techniques, the overall Power Factor (PF) would be improved to the expectation. The low power factor is caused by non-linearity of the input current. Boost converter is one of method of re-shaping the input waveform to be same pattern with the sinusoidal input voltage. The connected controls that act as a Power Factor Correction (PFC) circuit. The results were compared without PFC and passive PFC and active PFC. Finally the simulation results are shown to verify the performance of this modified the PFC. Keywords : rectifier , boost converter , active PFC , passive PFC , power factor correction (PFC) , power factor Introduction In most electrical and electronic power supplies, the AC input is rectified is connected directly after the diode rectifier bridge. The AC mains are common and extended source of energy. DC power supply is needed for operation of electronic equipments such as in computers, televisions, monitors and others. A simple circuit consisting of diode rectifiers and bulk capacitor can possible to obtain DC voltage. The problem of the input circuit, the high harmonic distortions on the line and excessive peak input currents are produced and the result of power factor in the system is poor. [1] In order to improve these problems, many power factor corrections of ac dc converters are presented to achieve high power factor and low harmonics distortion by modifying the input stage of the diode rectifier and the filter capacitor circuit. Power factor is defined as the ratio of the real power (P) to the apparent power (S) or cosine for pure sine wave for both current and voltage that represent s the phase angle between the current and voltage waveform. Figure 1.0a shows the power factor triangle.[2] Power factor is measure how efficiently electrical power is consumed. The power factor can vary between 0 to 1. It can be either lagging (inductive) or leading (capacitive). The poor power factor result in reduced efficiency which increases cost electricity.[2] Many utilities companies call upon penalties for the low power factor. When a converter has less than unity power factor, it means that the converter absorbs apparent power that is higher the active power it consumes. A higher VA rating than the load needed from the power source should be rated. Figure 1.0a: Power factor triangle The boost converter most widely used topology for achieving power factor correction. The figure shows the PFC boost converter circuit. [3] The process of reshaping the input current is done by boost converter. The bulk energy storage capacitor sits on the output side of the boost converter rather than just after the diode bridge. The control circuit for this project used low-cost components and satisfactory results. Figure 1.0b: relationship of Ac input voltage and current Figure 1.0b is show the waveform of relationship between Ac input voltage and current. The waveform is due the purely resistive non linear load. SYSTEM DESRIPTION A single phase rectifier with boost converter is shown in figure 1. Boost converter is used for reshaping input current. Figure 1.1a: Boost PFC converter Figure 1.1b: Voltages and currents waveforms Figure 1.1a and 1.1b shows that the basic configuration of rectifier that uses Boost converter technique as PFC with its respective voltages and currents. The input current would be highly non-linear for rectifier without PFC. It happened when the capacitor is having large value. [4] The boost converter involves a switch, a diode, an inductor and a capacitor. The switch and diode are depending on the voltage and current stress that they must handle for all the possible operating conditions. The boost converter also called step up converter which is the output voltage always greater than the input voltage. POWER FACTOR CORRECTION Power factor correction (PFC) is one of the methods to improve the low power factor of a system by using suitable devices. There are two type of the PFC namely the passive and active power factor correction. The aim of the power factor correction circuits is to make the input of the power supply behave like purely resistive or a resistor.[4,5] By using the passive PFC, it can achieve the objective of the low power factor applications. The addition of a filter inductor which is connected to the series with the input circuit, the passive elements is introduced to improve the line current. This passive element will increased to a value of 0.7 approximately. The achievement is degraded with the smaller values of inductance. The passive PFC is more suitable at lower power levels. The active power factor correction results are more suitable option for achieving the nearest unity power factor and the sinusoidal input current waveform. The active PFC design functions by controlling the input current in order to make the current waveform behave like the supply voltage. A converter and switching frequencies higher than the AC line frequency is added between the output of the diode bridge rectifier and the bulk capacitor in the active power factor correction. NON ISOLATED ISOLATED BOOST/BUCK, BUCK+BOOST PWM RECTIFIER FLYBACK FORWARD PWM RECTIFIER HIGH FREQUENCY LOW FREQUENCY P.W.M RESONANT Singe phase OFFLINE PDC circuit ACTIVE PFC PASSIVE PFC Figure 1.2: singe phase offline PFC topologies. PASSIVE POWER FACTOR CORRECTION The AC-DC converter comprises of a full bridge rectifier followed by a large filter capacitor for the input stage. The input current for the rectifier circuit comprises of the largest discontinuous peak current pulses. The high distortion of the input current occurs due to the diode rectifier conduct for the short period.[7] By using this passive power factor correction, the value of the power factor can be increased of the 0.7 approximately. Increasing power factor due to the idea of passive PFC which is to filter out the harmonic currents by using low pass filter. Thus, this passive power factor correction has the following main advantages and disadvantages: Advantages à ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬ it has a simple structure, it is reliable and rugged. The cost was very low and the high frequency switching losses are not sensitive to noises. Disadvantages à ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬ it create harmonic, it has poor power factor, it produces high losses and it reduces power maximum power capability from the load. In the passive PFC, the use of the inductor in the input circuit is simply used. . ACTIVE POWER FACTOR CORRECTION An active PFC is a power electronic device designed to control the amount of power drawn by a load and obtain a power factor as close as possible to unity. In an active PFC, the function was by controlling the input current and make the current behave like supply voltage. There are two classes of the active PFC solutions which are the low frequency and the high frequency active power factor correction. METHODOLOGY The simulation process is carried out by using PSIM software. The PSIM simulation model for overall system is shown in figure 2.0. The simulation circuit can be divided to three sections which are the main source (input), the PFC (rectifier) and the load (output). Figure 2.0: PSIM simulation model for overall system The software simulation process is divided into three steps which are non linear load, passive PFC and active PFC (boost converter). Start Without PFC. Simulation process using PSIM With PFC by using active filter (boost converter) With PFC by using passive PFC 1 2 3 Figure 2.1: flowchart of the simulation process First, a non-linear load without PFC is simulated for proof of concept using PFC. Figure 2.1.1 shows the flowchart of the process of the first simulation step. 1 Circuit modeling Connect a non linear load Desired result End Yes No Circuit simulation Figure 2.2: flowchart without PFC circuit In the next step, passive PFC is added in the circuit. The passive PFC which is additional to the diode bridge rectifier. The passive elements are introduced to improve the nature of line current. As the voltage increases, the sizes of PFC components increase too. Figure 2.1.2 shows the flowchart of the process of the second simulation step. 2 Circuit modeling Connect a non linear load Add passive element to the circuit Desired result End Yes No Circuit simulation Desired result End Yes No Circuit simulation 3 Circuit modeling Connect a non linear load Add boost converter after bridge diode in the circuit Add control circuit Figure 2.1.2 : flowchart for third simulation Figure 2.1.2: flowchart for second simulation In the third step, an active PFC replaced the passive PFC. The boost converter is added in this circuit. An active PFC can control the amount of power drawn by a load and obtains the power factor as close as possible to unity. Then the control circuit also added to the boost converter. Mosfet is used in the boost converter circuit which is a switching. RESULT AND DISCUSSION Without Power Factor Correction For the non linear load which is the circuit without the PFC , the power factor is low compares to the the using of power factor correction. From the waveforms , as we can see the power factor is 0.6 from 0.1 seconds onwards. The shape of input current is not likely the the shape of input voltage. It it because there are some disturbance happened in system. Figure 3.1 : without PFC Figure 3.2 : PF , Vin and Iin waveforms With Passive Power Factor The first step of the simulation is designed for non linear load. In the next step, a passive element which is the inductor is added to improve the nature of the line current. From these figure, the power factor increased to 0.7. The shape of input current also not behave like the input voltage. But it was better compare to using without PFC. Figure 3.3: Passive Power Factor Correction Figure 3.4: PF, Vin and Iin waveforms With Active Power Factor Correction by using Boost Converter In this step, the boost converter replaced the passive element which is using the Mosfet as the switch. Through the simulation, the power factor is improved to 0.9 from 0.1 seconds onwards. The process of reshaping the input current happened. The shape of input current also likely of the shape input voltage. From this simulation, by using the boost converter is obtained to get the power factor as close as possible to unity. The main of AC input voltage is rectified to the boost converter that mainly consisting of an inductor, Mosfet, a power diode, and a bulk capacitor. The boost converter is one of the high switching frequency topologies. Figure 3.5: PF, input current and input voltage waveforms Types Power factor Without PFC 0.6 Passive PFC 0.7 Acvtive PFC 0.9 Table 1: the value of power factor from simulation The table 1 shows that the power factor increase from 0.6 to 0.9. We get these values from the simulation of the three circuits. The rectifier with power factor correction was developed to realize the performance of this project. The power factor improvement by using active PFC was get good result compare to using passive filter. It is because the active PFC is more complex than passive PFC. the power factor correction makes the load look likely resistive element compare to a nonlinear load one without PFC. CONCLUSION In conclusion, the simulation results matched to the theories involved. This paper presents a research about power factor improvement by using power factor correction. The use of the power factor correction is to improve the low power factor and to make the input of power supply behave like to the purely resistive. The PFC circuitry that the controls the Boost converter is having the limitation when the loads current are smaller. The circuit will avoid the AC current to flow exceeding to the load demand. From the simulation results , the power factor is almost unity and purely sinusoidal input current followed the input voltage. ACKNOWLEDGMENT I would like to sincere thank you to my supervisor PM Pauziah bt Mohd Arsad , deparment of Electrical Engineering , UiTM Shah Alam for providing me the necessary guidance to carry out this project. I would like to take this opportunity to thank her for her constant support and guiding me throughout my work. Besides, I also would like to sincere thanks to my parents because always support me. Then thanks to all my friends who are help me during my project was running.

Pschological assessment Essay

Section A Write an essay on the process you would follow in developing a psychological assessment measure. Discuss the steps that you would take in this process, including how you would choose items for your test, how you would evaluate the reliability and validity of your test, and the issue of establishing norms. Discuss the theory comprehensively and illustrate your understanding with an example or examples. Introduction The process of developing a psychological test is a complex and lengthy one. ( Foxcroft & Roodt, 2001) but aspects related to the planning of a psychological test are not always sufficiently emphasised and sometimes not mentioned at all ( Kaplan & Saccuzzo, 1997). When the test is to be used in a multicultural context, attention needs to be paid to the cultural relevance (and potential bias) of the test right from the planning and design phase instead of only being sensitive to cultural aspects from the item writing phase onwards. Also given that we do not have a long history of developing culturally appropriate tests applicable to diverse groups in South Africa, test developers need to grapple with basic issues such as what methods of test administration might be appropriate or inappropriate for certain cultural groups and what language to develop the test in, for example. More time needs to be spent in the planning phase exploring and critically considering test design issues. Planning phase The first and most important step in developing psychological measures is the planning phase. Planning involves writing out the skeleton of what one aims to achieve. Careful though needs to go into deciding on the aim of the measure, defining the content of the measure and key elements of the test plan. a test plan consists of the following aspects: (a) specifying the purpose and rationale for the test as well as the intended target population, (b) defining the construct (content domain) and creating a set of test specifications to guide item writing, (c) choosing the test format, (d) choosing the item format, and (e) specifying the administration and scoring methods (Robertson, 1990). Specifying the aim of the measure The first step is to state the aim of the measure, the construct I will use and how the outcome will be used. If I am conducting this study in South Africa I will also need to mention that the measure will be used in a multicultural society. I would need to elaborate on what I mean by multicultural by highlighting the context. I would state the age of the test takers and their educational status. The information concluded above is important because it may have an impact on the test specifications and design. I would need to state whether the test would be paper-based or computer-based. When that decision is made I would need to consider whether the test-takers are familiar with such tests. The test takers may underperform on the evaluation because they are not proficient in the instrument of measure. This may impact the validity of the study to be conducted. I would also need to ascertain whether the test will be administered individually or in a group setting. Because psychological constructs are brewed in western societies, the emphasis is on individualism. When working in a multicultural society, however, it is important to consider the norms of the society I would be working in. In some cultures, for example, the group identity is valued over the individual identity. This could have an effect on the content of the measure. Defining the content of the measure Here I need to figure out what I want to measure and why. This will show me what to focus on during the other steps. A working definition of the construct is needed. This includes identifying exactly what I aim to get out of this research study. To do this I need to embark on a comprehensive literature review. I will see how my topic has been investigated in the past and spot the gaps. I can now make the decision on whether I am conducting a new study or adapting an existing study into the South African context. Later I will need to make the same decision on the instrument I will use for data gathering. Since I would be working in South Africa, I need to decide on whether separate norms should be developed for test takers from advantaged and disadvantaged schooling backgrounds and/or for urban and rural areas. I would assemble a team of content, language and cultural experts to scrutinise the content being developed. Nell (1994) states that  language is a critical moderator variable of test performance. If the test taker is not proficient in that language, it is difficult to ascertain whether poor performance is due to language or communication difficulty or that the test-taker has a low level of the construct being measured. I would produce the test in a bilingual format and specify the source language. Work would need to be done to ensure that the construct is meaningful for each group. Developing the test plan (specifications) Once the construct to be assessed has been defined and operationalised, a decision needs to be reached regarding what approach will be employed to guide the development of the test content and specifications. Decisions will be made regarding the format to be used (open-ended items, forced-choice items etc.), how they will be scored (objective or subjective tests), and whether time limits will be imposed. The language and cultural experts are once again needed during this step. Sometimes psychological constructs, conceptualised in western society, do not have a known equivalent in African discourse. For such constructs the translated version would need to explain the construct in a way that is closest to the English meaning. This will require more time for the African language test taker. The test specification should eliminate the possibility of construct bias. The format therefore needs to be standardised for a variety of cultural groups or it should at least include items that will be considered easy, moderate and difficult by all groups. Although these steps follow after each other, I will need to go backwards and forwards to ensure content and construct validity. Item writing The second step is item writing. Once the test specifications have been finalised, the team of experts writes or develops the items. The trend in South Africa has been to simply adapt an already made test to accommodate South African test takers. This is not necessarily the easier option. Firstly, concepts are not always understood in the same way in different societies. For example, the term depression is sometimes taken to mean with  very sad in some societies. It is therefore important to ensure construct validity even for an English test given to English mother tongue speakers of a different society to that of the tests’ origin. If the assessment measure will be administered to children, face validity will be ensured through the use of big writing, use of colour and drawings. The length of the items should also be considered. With every step of items writing reliability is ensured. Reviewing the items An item bank is then developed and items reviewed in terms of whether they meet the content specification and whether they are well written. Items which do not meet the specifications are removed from the bank before it can be used to generate criteria-referenced tests. The team of experts should focus on both content validity and indicate whether the items are from stereotyping and potential bias. The experts will then return the item list with recommendations. They will need to be re-written or revised. Assembling and pre-testing the experimental version of the measure Items need to be arranged in a logical way. Since we are dealing with a multicultural society, we need to ensure that the items are balanced and on appropriate pages. The length of the items in each category needs to be finalised. For long problems based items, time adjustments need to be made. A decision would have been made with regards to whether the test is paper-based or computer-based. The appropriate apparatus needs to be made available. The  Pre-testing the experimental version of the measure The test items have to be administered to a large group of examinees. This sample should be representative of the population for which the eventual test is intended. This will be the norm group. Items analysis phase During this phase items are checked for relevance. Again we see if each item is reliable and valid to the study. The characteristics of the items can be evaluated using the classical test theory or the item response theory. At the item level, the CTT model is relatively simple. CTT does not invoke a complex theoretical model to relate an examinee’s ability to success on a particular item. Instead, CTT collectively considers a pool of examinees and empirically examines their success rate on an item (assuming it is dichotomously scored). This success rate of a particular pool of examinees on an item, well known as the p value of the item, is used as the index for the item difficulty (actually, it is an inverse indicator of item difficulty, with higher value indicating an easier item). The ability of an item to discriminate between higher ability examinees and lower ability examinees is known as item discrimination, which is often expressed statistically as the Pearson product-moment correlation coefficient between the scores on the item (e.g., 0 and 1 on an item scored right-wrong) and the scores on the total test. When an item is dichotomously scored, this estimate is often computed as a point-biserial correlation coefficient. IRT, on the other hand, is more theory grounded and models the probabilistic distribution of examinees’ success at the item level. As its name indicates, IRT primarily focuses on the item-level information in contrast to the CTT’s primary focus on test-level information. The IRT framework encompasses a group of models, and the applicability of each model in a particular situation depends on the nature of the test items and the viability of different theoretical assumptions about the test items. Revising and standardizing the final version of the measure Once the qualitative and quantitative information has been gathered, the test is administered to the large sample for standardization. All the items that were found to be unclear are simplified. Vocabulary and grammar is corrected. Split-half reliability is assessed. The translated version is checked through back translation (into the source language). The items are finalised for the test. The final database is used to check on reliability  and validity. The administration and scoring instruction may need to be modified. Then the final version is administered. Technical evaluation and establishing norms The items can be analysed using the item response theory. The characteristics of each item may be represented graphically be means of a graph which relates an individuals’ ability score with their probability of passing the items. Items with large variances are selected. The scores obtained by the norm group in the final test form are referred to as the norms of the test. To compare an individual’s score with the norms, their raw score will be converted to the same kind of derived score as that in which the test norms are reported (e.g. percentile ranks, McCall’s T scores etc). Publishing and ongoing refinements A test manual is compiled before a measure published. The manual should make information on the psychometric properties of the test easily understandable. It will be updated from time to time as more information becomes available. Section B List the steps that should be followed in the adaption of an assessment measure for cross-cultural application and briefly explain what each step means. 1. Reasons for adapting measures  Cross-cultural assessment has become a sensitive issue due to specific concerns regarding the use of standardized tests across cultures. By adapting an instrument, the researcher is able to compare the already-existing data with newly acquired data, thus allowing for cross-cultural studies both on the national and international level. Adaptations also can conserve time and expenses (Hambleton, 1993). Test adaptation can lead to increased fairness in assessment by allowing individuals to be assessed in the language of their choice (Hambleton & Kanjee, 1995). 2. Important considerations when adapting measures The test can be compromised if there are problems between the test takers and the administrator. The administrator should therefore familiar with the culture of the test-taker. They cannot take it for granted that the test taker will be exposed to the format of the test. This could lead to the score representing a lack of skill with regards to the format of the test instead of measuring the construct being assessed. Some languages, like isiZulu, require more time to be spent reading therefore would require more time to complete. 3. Designs for adapting measures Before selecting an assessment instrument for use in counseling or research, counselors and researchers are trained to verify that the test is appropriate for use with their population. This includes investigation of validity, reliability, and appropriate norm groups to which the population is to be compared. Validity and reliability take on additional dimensions in cross-cultural testing as does the question of the appropriate norm group. The instrument must be validly adapted, the test items must have conceptual and linguistic equivalence, and the test and the test items must be bias free (Fouad, 1993; Geisinger, 1994). Two basic methods for test adaptation have been identified: forward translation and back-translation. In forward translation, the original test in the source language is translated into the target language and then bilinguals are asked to compare the original version with the adapted version (Hambleton, 1993; 1994). In back-translation, the test is translated into the target language and then it is re-translated back to the source language. This process can be repeated several times. Once the process is complete, the final back-translated version is compared to the original version (Hambleton, 1994). Each of these adaptation processes has their strengths and limitations. 4. Bias analysis and differential item functioning Another issue that must be considered in cross-cultural assessment is test bias. The test user must ascertain that the test and the test items do not systematically discriminate against one cultural group or another. Test bias  may occur when the contents of the test are more familiar to one group than to another or when the tests have differential predictive validity across groups (Fouad, 1994). Culture plays a significant role in cross-cultural assessment. Whenever tests developed in one culture are used with another culture there is the potential for misinterpretation and stagnation unless cultural issues are considered. Issues of test adaptation, test equivalence and test bias must be considered in order to fully utilize the benefit of cross-cultural assessment. 5. Steps for maximizing success in test adaption Hembleton (2004) summarised nine key steps that should be addressed when adapting or translating assessment instruments. 6. Challenges related to test adaption in south Africa A disadvantage of adaptation includes the risk of imposing conclusions based on concepts that exist in one culture but may not exist in the other. There are no guarantees that the concept in the source culture exists in the target culture (Lonner & Berry, 1986). Another disadvantage of adapting existing tests for use in another culture is that if certain constructs measured in the original version are not found in the target population, or if the construct is manifested in a different manner, the resulting scores can prove to be misleading (Hambleton, 1994). Despite the difficulties associated with using adapted instruments, this practice is important because it allows for greater generalizability and allows for investigation of differences among a growing diverse population. Once the test has been adapted, test equivalence must be determined. Reference Foxcroft, C.D. & Roodt, G. (2009). An introduction to psychological assessment in South Africa. Johannesburg: Oxford University Press Hambleton, R. K. (2001). The next generation of the ITC Test Translation and Adaptation Guidelines. European Journal of Psychological Assessment, 17, 164-172. Hambleton, R. K. (2004). Issues, designs, and technical guidelines for adapting tests into multiple languages and cultures. In R. K. Hambleton, P. F. Merenda, & C. D. Spielberger (Eds.), Adapting educational and psychological tests for cross-cultural assessment (pp. 3-38). Mahwah,NJ: Lawrence Erlbaum Associates Van Ede, D.M. (1996). How to adapt a measuring instrument for use with various cultural groups: a practical step-by-step introduction. South African Journal of Higher Education, 10, 153-160.

The Number One Question You Must Ask for Samples of Essay on the Birthmark by Nathaniel Hawthorne

The Number One Question You Must Ask for Samples of Essay on the Birthmark by Nathaniel Hawthorne After all, the youthful lady accepts the help of a witch rather than seeking a reverend. Lots of people who had nevuss were thought to be enchantresss. Lots of people who had birthmarks were thought to be witches. Atwood notices that they tend to not think quite like this (1). For people who believe themselves to be good are not and those who don't are. Aylmer attempts to take out the mark severally but fails. Aylmer is the sole person who isn't able to locate the beauty within it. Top Samples of Essay on the Birthmark by Nathaniel Hawthorne Secrets Everything in the essay has to be directly regarding the central idea and have to add to the reader's understanding of that central idea. Fortunately, you've come to the correct place to discover the greatest remedy to every single academic writing problem that you're currently facing with your essay. 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