EPE Association: EPE 2023 - DS1r: Power Quality Issues and Power Factor Correction Techniques

EPE 2023 - DS1r: Power Quality Issues and Power Factor Correction Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 07: Power Supplies > EPE 2023 - DS1r: Power Quality Issues and Power Factor Correction Techniques

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   Bipolar Output Voltage Control Strategy for Three-Level Neutral-Point Clamped Converter for Low-Voltage DC Distribution System
By Mina KIM, Hwa-Pyeong PARK, Byoung-Sun KO, Dae-Seak CHA, Jung-Sik CHOI, Seung-Yeol OH [View]
[Download]

Abstract: This paper proposes a bipolar output voltage control strategy for a 3-level NPC converter for LVDC systems. The proposed method compensates for the DC and AC imbalance between the bipolar outputs by injecting DC and AC offsets into the PWM reference. The effectiveness of the proposed method has been verified with simulation results compared to the conventional bipolar output voltage control methods and experimental results using a 400-kW 3-level NPC converter prototype.

   Constraints on the Controller Bandwidth of Grid-tied Inverters
By Francois DU PLESSIS, Johan BEUKES [View]
[Download]

Abstract: Small-signal inverter impedance modellingis used to characterise the negative inverter resistance ofdifferent control topologies caused by digital delays. Adesign method is applied to a simulated and experimentalinverter system that limits the controller bandwidthpreventing undamped resonances and ensuring acceptableharmonic emission levels.

   Coordinated full-bridge inverter PWM control strategy for improved energy efficiency
By Jordan FONTAINE, Baptiste TRAJIN, Paul-Etienne VIDAL [View]
[Download]

Abstract: This paper is intended to quantify the impact of several parameters related to two full-bridge inverters connected to the same DC bus on the harmonic content of the DC link current. The presented simulations suggest that the DC current distortion factor is impacted by the PWM scheme choices, by the carriers phase shift, by the load current phase shift and frequencies.

   Deep-learning-based Fast System-level Harmonic Control Strategy for Multi-bus Voltages Detected APF in Distribution Systems
By Zebin YANG, Hao YI, Xian WU, Fang ZHUO, Lingyu ZHU, Qing WANG [View]
[Download]

Abstract: Conventional linearized-model-based system-level control strategy of active power filter (APF) has poor dynamic control performance when load changing happens. Therefore, a four-layer neural network is built to learn the convergence behavior of the linearized system-level harmonic mitigation model. Then, a deep-learning-based control strategy is proposed to achieve fast mitigation of multi-bus harmonic voltages by single APF. Finally, an eight-bus system with distributed harmonic loads is built in simulation. Simulation results proves the good dynamic performance of the proposed method. Moreover, compared with conventional implementation of deep learning method in system-level harmonic control, the proposed method benefits in lower data demand and simplified training process.

   Impedance Analysis and Resonance Mitigation for Sample-Correction-Based Boost Power Factor Correction Converters
By Tianhua ZHU, Xiongfei WANG, Fangzhou ZHAO, Grover TORRICO [View]
[Download]

Abstract: This letter analyzes the input impedance of digitally controlled boost power factor correc-tion (PFC) converters, with a particular focus on the impact of current sampling. It is revealed that the use of a correction factor with current sampling brings a non-dissipative region to the input impedance of PFC converter when the load is heavy. Consequently, un¬de¬sired high-frequency resonances may arise in the input current of PFC converter. To mitigate the reso¬nance, an enhanced current-sampling correction method is proposed and validated by experi¬mental tests.

   Optimal Installation and System-level Control Strategy of SAPF Based on Extended-range Compensation of Multi-bus Harmonic Sources in Distribution Networks
By Zebin YANG, Hao YI, Yihong YOU, Fang ZHUO, Cao ZHAN, Shuaibin SHI [View]
[Download]

Abstract: With the rapid increase of the type and quantity of nonlinear loads in networks, the required amount of shunt active power filters (SAPFs) becomes large. To reduce the maintenance cost of harmonic compensation, the optimal installation and system-level control of SAPF is proposed to achieve the comprehensive harmonic mitigation in a distribution network. Firstly, a SAPF extended-range compensation model is built to evaluate the harmonic compensation distance and harmonic compensation sensitivity of multi-bus harmonic disturbance sources. Then, the optimal installation algorithm and system-level control scheme of SAPF are designed. Finally, the simulation result based on the IEEE 18-bus network with distributed nonlinear loads verifies the effectiveness of the proposed SAPF installation strategy in good harmonic voltage suppression performance and small installation capacity.

   Optimal inverter control for grid voltage unbalance mitigation
By Werner DE WET, Johan BEUKES, Francois DU PLESSIS [View]
[Download]

Abstract: This paper provides a positive and negative sequence dq domain inverter control system to perform voltage unbalance mitigation and voltage regulation. This control system ensures that the inverter performs voltage regulation by means of reactive power compensation and transfers active and reactive power between the three phases to perform voltage unbalance mitigation. Detailed designs of the control system are provided, and the desired response and accurate compensation of the inverter are verified by measurements using an experimental setup.

   Reducing Harmonic Distortion in Ship Power Systems: An Evaluation of Three Shunt Active Power Filter Control Strategies
By Nikolay DJAGAROV, Dimitar TSVETANOV, Julia DJAGAROVA, Hristo MILUSHEV, Josep M. GUERRERO [View]
[Download]

Abstract: Nowadays, the challenge of preserving and improving the electrical power quality is increasing due to the widespread use of non-linear loads in ship power systems. This may lead to degradation that can adversely affect the operation of electrical equipment and cause overall system instability. To mitigate these effects, various approaches, including use of active and passive filters, and other techniques, can be implemented.This research presents a comparison of three control methods for the Shunt Active Power Filter (SAPF) in an autonomous ship power system using a proposed mathematical model. The Synchronous Reference Frame (SRF) theory, PQ-based control theory, and Peak detection control method were implemented and analyzed. The Total Harmonic Distortion (THD) reduction performance and the impact of the filters on the variables of the synchronous generator were evaluated through simulation. The results show that the Peak detection control method outperforms the other two methods in terms of THD reduction while having minimal impact on the parameters of the synchronous generator.

EPE 2023 - DS1r: Power Quality Issues and Power Factor Correction Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 07: Power Supplies > EPE 2023 - DS1r: Power Quality Issues and Power Factor Correction Techniques
	[return to parent folder]

	Bipolar Output Voltage Control Strategy for Three-Level Neutral-Point Clamped Converter for Low-Voltage DC Distribution System By Mina KIM, Hwa-Pyeong PARK, Byoung-Sun KO, Dae-Seak CHA, Jung-Sik CHOI, Seung-Yeol OH	[View] [Download]
Abstract: This paper proposes a bipolar output voltage control strategy for a 3-level NPC converter for LVDC systems. The proposed method compensates for the DC and AC imbalance between the bipolar outputs by injecting DC and AC offsets into the PWM reference. The effectiveness of the proposed method has been verified with simulation results compared to the conventional bipolar output voltage control methods and experimental results using a 400-kW 3-level NPC converter prototype.

	Constraints on the Controller Bandwidth of Grid-tied Inverters By Francois DU PLESSIS, Johan BEUKES	[View] [Download]
Abstract: Small-signal inverter impedance modellingis used to characterise the negative inverter resistance ofdifferent control topologies caused by digital delays. Adesign method is applied to a simulated and experimentalinverter system that limits the controller bandwidthpreventing undamped resonances and ensuring acceptableharmonic emission levels.

	Coordinated full-bridge inverter PWM control strategy for improved energy efficiency By Jordan FONTAINE, Baptiste TRAJIN, Paul-Etienne VIDAL	[View] [Download]
Abstract: This paper is intended to quantify the impact of several parameters related to two full-bridge inverters connected to the same DC bus on the harmonic content of the DC link current. The presented simulations suggest that the DC current distortion factor is impacted by the PWM scheme choices, by the carriers phase shift, by the load current phase shift and frequencies.

	Deep-learning-based Fast System-level Harmonic Control Strategy for Multi-bus Voltages Detected APF in Distribution Systems By Zebin YANG, Hao YI, Xian WU, Fang ZHUO, Lingyu ZHU, Qing WANG	[View] [Download]
Abstract: Conventional linearized-model-based system-level control strategy of active power filter (APF) has poor dynamic control performance when load changing happens. Therefore, a four-layer neural network is built to learn the convergence behavior of the linearized system-level harmonic mitigation model. Then, a deep-learning-based control strategy is proposed to achieve fast mitigation of multi-bus harmonic voltages by single APF. Finally, an eight-bus system with distributed harmonic loads is built in simulation. Simulation results proves the good dynamic performance of the proposed method. Moreover, compared with conventional implementation of deep learning method in system-level harmonic control, the proposed method benefits in lower data demand and simplified training process.

	Impedance Analysis and Resonance Mitigation for Sample-Correction-Based Boost Power Factor Correction Converters By Tianhua ZHU, Xiongfei WANG, Fangzhou ZHAO, Grover TORRICO	[View] [Download]
Abstract: This letter analyzes the input impedance of digitally controlled boost power factor correc-tion (PFC) converters, with a particular focus on the impact of current sampling. It is revealed that the use of a correction factor with current sampling brings a non-dissipative region to the input impedance of PFC converter when the load is heavy. Consequently, un¬de¬sired high-frequency resonances may arise in the input current of PFC converter. To mitigate the reso¬nance, an enhanced current-sampling correction method is proposed and validated by experi¬mental tests.

	Optimal Installation and System-level Control Strategy of SAPF Based on Extended-range Compensation of Multi-bus Harmonic Sources in Distribution Networks By Zebin YANG, Hao YI, Yihong YOU, Fang ZHUO, Cao ZHAN, Shuaibin SHI	[View] [Download]
Abstract: With the rapid increase of the type and quantity of nonlinear loads in networks, the required amount of shunt active power filters (SAPFs) becomes large. To reduce the maintenance cost of harmonic compensation, the optimal installation and system-level control of SAPF is proposed to achieve the comprehensive harmonic mitigation in a distribution network. Firstly, a SAPF extended-range compensation model is built to evaluate the harmonic compensation distance and harmonic compensation sensitivity of multi-bus harmonic disturbance sources. Then, the optimal installation algorithm and system-level control scheme of SAPF are designed. Finally, the simulation result based on the IEEE 18-bus network with distributed nonlinear loads verifies the effectiveness of the proposed SAPF installation strategy in good harmonic voltage suppression performance and small installation capacity.

	Optimal inverter control for grid voltage unbalance mitigation By Werner DE WET, Johan BEUKES, Francois DU PLESSIS	[View] [Download]
Abstract: This paper provides a positive and negative sequence dq domain inverter control system to perform voltage unbalance mitigation and voltage regulation. This control system ensures that the inverter performs voltage regulation by means of reactive power compensation and transfers active and reactive power between the three phases to perform voltage unbalance mitigation. Detailed designs of the control system are provided, and the desired response and accurate compensation of the inverter are verified by measurements using an experimental setup.

	Reducing Harmonic Distortion in Ship Power Systems: An Evaluation of Three Shunt Active Power Filter Control Strategies By Nikolay DJAGAROV, Dimitar TSVETANOV, Julia DJAGAROVA, Hristo MILUSHEV, Josep M. GUERRERO	[View] [Download]
Abstract: Nowadays, the challenge of preserving and improving the electrical power quality is increasing due to the widespread use of non-linear loads in ship power systems. This may lead to degradation that can adversely affect the operation of electrical equipment and cause overall system instability. To mitigate these effects, various approaches, including use of active and passive filters, and other techniques, can be implemented.This research presents a comparison of three control methods for the Shunt Active Power Filter (SAPF) in an autonomous ship power system using a proposed mathematical model. The Synchronous Reference Frame (SRF) theory, PQ-based control theory, and Peak detection control method were implemented and analyzed. The Total Harmonic Distortion (THD) reduction performance and the impact of the filters on the variables of the synchronous generator were evaluated through simulation. The results show that the Peak detection control method outperforms the other two methods in terms of THD reduction while having minimal impact on the parameters of the synchronous generator.