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S K Panda - One of the best experts on this subject based on the ideXlab platform.
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analysis of the Instantaneous Power flow for three phase pwm boost rectifier under unbalanced supply voltage conditions
IEEE Transactions on Power Electronics, 2008Co-Authors: S K PandaAbstract:This paper proposes the analysis of the Instantaneous Power flow of three-phase pulse-width modulation (PWM) boost rectifier under unbalanced supply voltage conditions. An analytical expression for the Instantaneous output Power has been derived, which provides the link between the output dc link voltage and the Instantaneous output Power. A direct relationship between the dc link voltage ripples and the second harmonic component in the Instantaneous output Power has been established. Based on the input and output Instantaneous Power analytical expressions provided, the presence of the odd order harmonic components in the ac line currents can be explained. A simple cascaded PI control scheme has been developed for the dc output voltage control. The controller ensures that the dc link voltage is maintained constant and the supply side Power factor is kept close to unity under the unbalanced supply voltage operating conditions. Simulation and experimental test results are provided on a 1.6-kVA laboratory-based PWM rectifier to validate the proposed analysis and control scheme.
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an output Power control strategy for a three phase pwm rectifier under unbalanced supply conditions
IEEE Transactions on Industrial Electronics, 2008Co-Authors: R Oruganti, S K Panda, A K S BhatAbstract:Instantaneous Power regulation is an effective way to improve the performance of a pulsewidth-modulation rectifier operating under unbalanced supply-voltage conditions. By properly setting current commands, this approach aims to achieve performance features that are normally achievable only under ideal balanced operating conditions. This paper proposes an Instantaneous Power-regulation strategy called output-Power-control method, in which the current commands are determined so as to appropriately distribute the input Power to maintain a constant dc output voltage and sinusoidal line currents. Although the Power factor is not directly controlled, it is shown that the proposed scheme results in near unity vector Power factor. The current commands are given by a set of simple linear equations in which the proposed control scheme can be easily implemented. Experimental results obtained with a 1-kW laboratory prototype demonstrate that the proposed scheme fulfils all the main objectives of a high-performance rectifier.
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analysis and control of the output Instantaneous Power for three phase pwm boost rectifier under unbalanced supply voltage conditions
Conference of the Industrial Electronics Society, 2006Co-Authors: S K PandaAbstract:This paper proposes a new method to analyze the output Instantaneous Power of the three phase PWM boost rectifier under unbalanced supply voltage conditions. An analytical expression for the output Instantaneous Power has been derived and presented, which provides the link between the output dc linkage voltage and the Instantaneous output Power. Based on the mathematical model of the three phase PWM rectifier in the rotating synchronous frame, the physical concept of the output Instantaneous Power has been explained from the analytical point of view. A direct relationship between the dc link voltage ripples and the second harmonic component in the Instantaneous output Power has been derived. A simple cascaded PI control scheme has been developed for the dc output voltage control. The controller ensures that the dc link voltage is maintained constant and the supply side Power factor is kept close to unity under the unbalanced supply voltage operating conditions. Simulation and experimental test results are provided on a 1.6 kVA laboratory based PWM rectifier to validate the proposed analysis and control scheme.
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a novel Instantaneous Power control strategy for a pwm rectifier under unbalanced input voltage conditions
Conference of the Industrial Electronics Society, 2004Co-Authors: Bo Yin, S K Panda, R Oruganti, A K S BhatAbstract:Instantaneous Power regulation is an effective way to improve the performance of a PWM rectifier operating under unbalanced input voltage. By properly presetting current commands, this approach can maintain the desired performance features normally achieved only under ideal balanced operating conditions. These desirable performance features include sinusoidal input current at a near unity Power factor, nearly constant DC output voltage with a small output capacitor and also fast dynamic response. However, the relationship between Power and current in an AC to DC PWM rectifier is highly nonlinear under unbalanced operating conditions and it is not normally clear that a solution to the nonlinear system fulfilling all of the desirable requirements exists. The uniqueness and existence of a solution for such a nonlinear system is difficult to demonstrate. This paper presents a novel Instantaneous Power control strategy in which current commands are well regulated so as to distribute input Power Instantaneously and appropriately to the DC load and to the synchronous inductances while maintaining a constant DC voltage and sinusoidal input currents. A good feature of the proposed method is that the current commands are given by a set of simple equations, which can be easily implemented. Also, the simplicity of the equations avoids complex mathematical arguments for demonstrating uniqueness and existence of the solutions. It is shown also that near unity Power factor operation can be achieved with the proposed scheme. Experimental results demonstrate that the scheme fulfils all the objectives of a high performance controller.
Nashiren Farzilah Mailah - One of the best experts on this subject based on the ideXlab platform.
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A Dual-Function Instantaneous Power Theory for Operation of Three-Level Neutral-Point-Clamped Inverter-Based Shunt Active Power Filter
MDPI AG, 2018Co-Authors: Yap Hoon, Mohd Amran Mohd Radzi, Mohd Khair Hassan, Nashiren Farzilah MailahAbstract:This paper proposes a simple yet effective reference current generation algorithm based on Instantaneous Power pq theory to enhance mitigation performance of a three-phase three-level neutral-point-clamped (NPC) inverter-based shunt active Power filter (SAPF). The proposed algorithm is developed for dual functionality: generate reference current and synchronization phase to effectively govern operation of SAPF in mitigating harmonic current and compensating reactive Power. Three key modifications are implemented: (1) replacement of numerical low-pass filter (LPF) with an average Power detector to improve mitigation performance; (2) removal of needless reactive element to reduce algorithm complexity; and (3) integration of phase tracking feature to eliminate the needs of phase-locked loop (PLL). Simulation work of SAPF with the proposed algorithm was conducted and assessed in MATLAB–Simulink. In addition, to verify feasibility of the proposed algorithm, a laboratory prototype as constructed with TMS320F28335 digital signal processor (DSP) programmed as the controller. Performance of SAPF achieved by utilizing the proposed algorithm was thoroughly investigated and benchmarked with that demonstrated using the existing pq theory algorithm to evaluate the inherent advantages. Simulation and experimental results are obtained for different nonlinear loads and test conditions. Responses demonstrated by SAPF in both simulation and experimental works reveal superiority of the proposed algorithm over the existing algorithm
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a refined self tuning filter based Instantaneous Power theory algorithm for indirect current controlled three level inverter based shunt active Power filters under non sinusoidal source voltage conditions
Energies, 2017Co-Authors: Yap Hoon, Mohd Amran Mohd Radzi, Mohd Khair Hassan, Nashiren Farzilah MailahAbstract:In this paper, a refined reference current generation algorithm based on Instantaneous Power (pq) theory is proposed, for operation of an indirect current controlled (ICC) three-level neutral-point diode clamped (NPC) inverter-based shunt active Power filter (SAPF) under non-sinusoidal source voltage conditions. SAPF is recognized as one of the most effective solutions to current harmonics due to its flexibility in dealing with various Power system conditions. As for its controller, pq theory has widely been applied to generate the desired reference current due to its simple implementation features. However, the conventional dependency on self-tuning filter (STF) in generating reference current has significantly limited mitigation performance of SAPF. Besides, the conventional STF-based pq theory algorithm is still considered to possess needless features which increase computational complexity. Furthermore, the conventional algorithm is mostly designed to suit operation of direct current controlled (DCC) SAPF which is incapable of handling switching ripples problems, thereby leading to inefficient mitigation performance. Therefore, three main improvements are performed which include replacement of STF with mathematical-based fundamental real Power identifier, removal of redundant features, and generation of sinusoidal reference current. To validate effectiveness and feasibility of the proposed algorithm, simulation work in MATLAB-Simulink and laboratory test utilizing a TMS320F28335 digital signal processor (DSP) are performed. Both simulation and experimental findings demonstrate superiority of the proposed algorithm over the conventional algorithm.
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enhanced Instantaneous Power theory with average algorithm for indirect current controlled three level inverter based shunt active Power filter under dynamic state conditions
Mathematical Problems in Engineering, 2016Co-Authors: Yap Hoon, Mohd Amran Mohd Radzi, Mohd Khair Hassan, Nashiren Farzilah MailahAbstract:An enhanced harmonics extraction algorithm based on Instantaneous Power (PQ) Theory is proposed for indirect current controlled (ICC) three-level neutral point diode clamped (NPC) inverter-based shunt active Power filter (SAPF). SAPF is famous in current harmonics mitigation for its flexibility in dealing with dynamic state conditions. As for its controller, PQ Theory has served the major role in harmonics extraction algorithm due to its simple implementation features. However, it suffers from serious time delay due to its dependency on sluggish numerical filters. Furthermore, the algorithm is mostly designed to suit the operation of direct current controlled (DCC) SAPF which requires the knowledge of actual SAPF current (injection current). This leads to inaccurate mitigation as the injection current does not possess the exact information on actual source current which suffers from switching ripples problems. Therefore, two major modifications are introduced involving the development of mathematical average algorithm to replace numerical filter for fundamental real Power computation and the formation of mathematical current relationship to change DCC to ICC based operation. The proposed algorithm is developed and evaluated in MATLAB/Simulink. From the simulation results, significant improvement in terms of Total Harmonic Distortion (THD) and response time is presented in comparison to conventional algorithm.
Birgitte Bak-jensen - One of the best experts on this subject based on the ideXlab platform.
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Instantaneous Power compensation in three phase systems by using p q r theory
IEEE Transactions on Power Electronics, 2002Co-Authors: Hyosung Kim, Frede Blaabjerg, Birgitte Bak-jensen, Jaeho ChoiAbstract:This paper proposes a novel Power compensation algorithm in three-phase four-wire systems by using p-q-r theory. The p-q-r theory is compared with two previous Instantaneous Power theories, p-q theory and cross vector theory. The p-q-r theory provides two-degrees of freedom to control the system currents by only compensating the Instantaneous imaginary Power without using any energy storage element. The definition of Powers maintains Power conservation, and agrees well with the general understanding of Power. Simulation results show the superiority of p-q-r theory both in definition and compensation.
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Spectral analysis of Instantaneous Powers in single-phase and three-phase systems with use of p-q-r theory
IEEE Transactions on Power Electronics, 2002Co-Authors: Hyosung Kim, Frede Blaabjerg, Birgitte Bak-jensenAbstract:Three linearly independent Instantaneous Powers have been defined in the time domain in three-phase four-wire systems with the use of p-q-r theory. Any three-phase circuit can be transformed into three single-phase circuits by the p-q-r transformation. Thus the Instantaneous Powers in any three-phase systems can be analyzed as the same way of Instantaneous Power in single-phase systems. This paper analyzes the Instantaneous Powers spectrally in the frequency domain for single-phase systems and three-phase systems. Each Instantaneous Power in three-phase systems has its own spectral pattern that is characterized by the spectral distribution of the system voltages and currents. The Instantaneous Power in single-phase systems has its own spectral pattern different from that of three-phase systems. From the spectral analysis of the Instantaneous Powers, Powers are newly defined in the frequency domain. The definition of the Powers is consistent through single-phase systems and three-phase systems and agrees well with the traditional definition of Powers in sinusoidal single-phase systems. Based on the defined Powers, some useful Power quality factors are defined to evaluate Power qualities for various circuit conditions.
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Instantaneous Power compensation in three phase systems by using p q r theory
Power Electronics Specialists Conference, 2001Co-Authors: Hyosung Kim, Frede Blaabjerg, Birgitte Bak-jensen, Jaeho ChoiAbstract:This paper proposes a novel Power compensation algorithm in three-phase four-wire Power systems by using p-q-r theory. P-q-r theory is compared with two previous Instantaneous Power theories, p-q theory and cross-vector theory. P-q-r theory provides two-degrees of freedom to control the system currents by only compensating the Instantaneous imaginary Power without using any energy storage element. The definition of Powers maintains conservatism, and agrees well with the general understanding of Power. Simulation results show the superiority of p-q-r theory both in definition and compensation.
Yap Hoon - One of the best experts on this subject based on the ideXlab platform.
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A Dual-Function Instantaneous Power Theory for Operation of Three-Level Neutral-Point-Clamped Inverter-Based Shunt Active Power Filter
MDPI AG, 2018Co-Authors: Yap Hoon, Mohd Amran Mohd Radzi, Mohd Khair Hassan, Nashiren Farzilah MailahAbstract:This paper proposes a simple yet effective reference current generation algorithm based on Instantaneous Power pq theory to enhance mitigation performance of a three-phase three-level neutral-point-clamped (NPC) inverter-based shunt active Power filter (SAPF). The proposed algorithm is developed for dual functionality: generate reference current and synchronization phase to effectively govern operation of SAPF in mitigating harmonic current and compensating reactive Power. Three key modifications are implemented: (1) replacement of numerical low-pass filter (LPF) with an average Power detector to improve mitigation performance; (2) removal of needless reactive element to reduce algorithm complexity; and (3) integration of phase tracking feature to eliminate the needs of phase-locked loop (PLL). Simulation work of SAPF with the proposed algorithm was conducted and assessed in MATLAB–Simulink. In addition, to verify feasibility of the proposed algorithm, a laboratory prototype as constructed with TMS320F28335 digital signal processor (DSP) programmed as the controller. Performance of SAPF achieved by utilizing the proposed algorithm was thoroughly investigated and benchmarked with that demonstrated using the existing pq theory algorithm to evaluate the inherent advantages. Simulation and experimental results are obtained for different nonlinear loads and test conditions. Responses demonstrated by SAPF in both simulation and experimental works reveal superiority of the proposed algorithm over the existing algorithm
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a refined self tuning filter based Instantaneous Power theory algorithm for indirect current controlled three level inverter based shunt active Power filters under non sinusoidal source voltage conditions
Energies, 2017Co-Authors: Yap Hoon, Mohd Amran Mohd Radzi, Mohd Khair Hassan, Nashiren Farzilah MailahAbstract:In this paper, a refined reference current generation algorithm based on Instantaneous Power (pq) theory is proposed, for operation of an indirect current controlled (ICC) three-level neutral-point diode clamped (NPC) inverter-based shunt active Power filter (SAPF) under non-sinusoidal source voltage conditions. SAPF is recognized as one of the most effective solutions to current harmonics due to its flexibility in dealing with various Power system conditions. As for its controller, pq theory has widely been applied to generate the desired reference current due to its simple implementation features. However, the conventional dependency on self-tuning filter (STF) in generating reference current has significantly limited mitigation performance of SAPF. Besides, the conventional STF-based pq theory algorithm is still considered to possess needless features which increase computational complexity. Furthermore, the conventional algorithm is mostly designed to suit operation of direct current controlled (DCC) SAPF which is incapable of handling switching ripples problems, thereby leading to inefficient mitigation performance. Therefore, three main improvements are performed which include replacement of STF with mathematical-based fundamental real Power identifier, removal of redundant features, and generation of sinusoidal reference current. To validate effectiveness and feasibility of the proposed algorithm, simulation work in MATLAB-Simulink and laboratory test utilizing a TMS320F28335 digital signal processor (DSP) are performed. Both simulation and experimental findings demonstrate superiority of the proposed algorithm over the conventional algorithm.
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enhanced Instantaneous Power theory with average algorithm for indirect current controlled three level inverter based shunt active Power filter under dynamic state conditions
Mathematical Problems in Engineering, 2016Co-Authors: Yap Hoon, Mohd Amran Mohd Radzi, Mohd Khair Hassan, Nashiren Farzilah MailahAbstract:An enhanced harmonics extraction algorithm based on Instantaneous Power (PQ) Theory is proposed for indirect current controlled (ICC) three-level neutral point diode clamped (NPC) inverter-based shunt active Power filter (SAPF). SAPF is famous in current harmonics mitigation for its flexibility in dealing with dynamic state conditions. As for its controller, PQ Theory has served the major role in harmonics extraction algorithm due to its simple implementation features. However, it suffers from serious time delay due to its dependency on sluggish numerical filters. Furthermore, the algorithm is mostly designed to suit the operation of direct current controlled (DCC) SAPF which requires the knowledge of actual SAPF current (injection current). This leads to inaccurate mitigation as the injection current does not possess the exact information on actual source current which suffers from switching ripples problems. Therefore, two major modifications are introduced involving the development of mathematical average algorithm to replace numerical filter for fundamental real Power computation and the formation of mathematical current relationship to change DCC to ICC based operation. The proposed algorithm is developed and evaluated in MATLAB/Simulink. From the simulation results, significant improvement in terms of Total Harmonic Distortion (THD) and response time is presented in comparison to conventional algorithm.
Hyosung Kim - One of the best experts on this subject based on the ideXlab platform.
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Instantaneous Power compensation in three phase systems by using p q r theory
IEEE Transactions on Power Electronics, 2002Co-Authors: Hyosung Kim, Frede Blaabjerg, Birgitte Bak-jensen, Jaeho ChoiAbstract:This paper proposes a novel Power compensation algorithm in three-phase four-wire systems by using p-q-r theory. The p-q-r theory is compared with two previous Instantaneous Power theories, p-q theory and cross vector theory. The p-q-r theory provides two-degrees of freedom to control the system currents by only compensating the Instantaneous imaginary Power without using any energy storage element. The definition of Powers maintains Power conservation, and agrees well with the general understanding of Power. Simulation results show the superiority of p-q-r theory both in definition and compensation.
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Spectral analysis of Instantaneous Powers in single-phase and three-phase systems with use of p-q-r theory
IEEE Transactions on Power Electronics, 2002Co-Authors: Hyosung Kim, Frede Blaabjerg, Birgitte Bak-jensenAbstract:Three linearly independent Instantaneous Powers have been defined in the time domain in three-phase four-wire systems with the use of p-q-r theory. Any three-phase circuit can be transformed into three single-phase circuits by the p-q-r transformation. Thus the Instantaneous Powers in any three-phase systems can be analyzed as the same way of Instantaneous Power in single-phase systems. This paper analyzes the Instantaneous Powers spectrally in the frequency domain for single-phase systems and three-phase systems. Each Instantaneous Power in three-phase systems has its own spectral pattern that is characterized by the spectral distribution of the system voltages and currents. The Instantaneous Power in single-phase systems has its own spectral pattern different from that of three-phase systems. From the spectral analysis of the Instantaneous Powers, Powers are newly defined in the frequency domain. The definition of the Powers is consistent through single-phase systems and three-phase systems and agrees well with the traditional definition of Powers in sinusoidal single-phase systems. Based on the defined Powers, some useful Power quality factors are defined to evaluate Power qualities for various circuit conditions.
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Instantaneous Power compensation in three phase systems by using p q r theory
Power Electronics Specialists Conference, 2001Co-Authors: Hyosung Kim, Frede Blaabjerg, Birgitte Bak-jensen, Jaeho ChoiAbstract:This paper proposes a novel Power compensation algorithm in three-phase four-wire Power systems by using p-q-r theory. P-q-r theory is compared with two previous Instantaneous Power theories, p-q theory and cross-vector theory. P-q-r theory provides two-degrees of freedom to control the system currents by only compensating the Instantaneous imaginary Power without using any energy storage element. The definition of Powers maintains conservatism, and agrees well with the general understanding of Power. Simulation results show the superiority of p-q-r theory both in definition and compensation.