http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Seamless Mode Transfer of Utility Interactive Inverters Based on Indirect Current Control
Lim, Kyungbae,Song, Injong,Choi, Jaeho,Yoo, Hyeong-Jun,Kim, Hak-Man The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
This paper proposes an indirect current control technique based on a proportional resonant (PR) approach for the seamless mode transfer of utility interactive inverters. Direct-current and voltage hybrid control methods have been used for inverter control under grid-connected and islanded modes. A large bandwidth can be selected due to the structure of single-loop control. However, this results in poor dynamic transients due to sudden changes of the controller during mode changes. Therefore, inverter control based on indirect current is proposed to improve the dynamic transients by consistently controlling the output voltage under all of the operation modes. A PR-based indirect current control topology is used in this study to maintain the load voltage quality under all of the modes. The design processes of the PR-based triple loop are analyzed in detail while considering the system stability and dynamic transients. The mode transfer techniques are described in detail for both sudden unintentional islanding and islanded mode voltage quality improvements. In addition, they are described using the proposed indirect control structure. The proposed method is verified by the PSiM simulations and laboratory-scale VDER-HILS experiments.
Output Voltage Regulation for Harmonic Compensation under Islanded Mode of Microgrid
Kyungbae Lim,Jaeho Choi 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.2
This study examines a P+multi resonant-based voltage control for voltage harmonics compensation under the islanded mode of a microgrid. In islanded mode, the inverter is defined as a voltage source to supply the full local load demand without the connection to the grid. On the other hand, the output voltage waveform is distorted by the negative and zero sequence components and current harmonics due to the unbalanced and nonlinear loads. In this paper, the P+multi resonant controller is used to compensate for the voltage harmonics. The gain tuning method is assessed by the tendency analysis of the controller as the variation of gain. In addition, this study analyzes the slight voltage magnitude drop due to the practical form of the P+multi resonant and proposes a counter method to solve this problem by adding the PI-based voltage restoration method. The proposed P+multi resonant controller to compensate for the voltage harmonics is verified through the PSIM simulation and experimental results.
Output Voltage Regulation for Harmonic Compensation under Islanded Mode of Microgrid
Lim, Kyungbae,Choi, Jaeho The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.2
This study examines a P+multi resonant-based voltage control for voltage harmonics compensation under the islanded mode of a microgrid. In islanded mode, the inverter is defined as a voltage source to supply the full local load demand without the connection to the grid. On the other hand, the output voltage waveform is distorted by the negative and zero sequence components and current harmonics due to the unbalanced and nonlinear loads. In this paper, the P+multi resonant controller is used to compensate for the voltage harmonics. The gain tuning method is assessed by the tendency analysis of the controller as the variation of gain. In addition, this study analyzes the slight voltage magnitude drop due to the practical form of the P+multi resonant and proposes a counter method to solve this problem by adding the PI-based voltage restoration method. The proposed P+multi resonant controller to compensate for the voltage harmonics is verified through the PSIM simulation and experimental results.
Seamless Mode Transfer of Utility Interactive Inverters Based on Indirect Current Control
Kyungbae Lim,Injong Song,Jaeho Choi,Hyeong-Jun Yoo,Hak-Man Kim 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
This paper proposes an indirect current control technique based on a proportional resonant (PR) approach for the seamless mode transfer of utility interactive inverters. Direct-current and voltage hybrid control methods have been used for inverter control under grid-connected and islanded modes. A large bandwidth can be selected due to the structure of single-loop control. However, this results in poor dynamic transients due to sudden changes of the controller during mode changes. Therefore, inverter control based on indirect current is proposed to improve the dynamic transients by consistently controlling the output voltage under all of the operation modes. A PR-based indirect current control topology is used in this study to maintain the load voltage quality under all of the modes. The design processes of the PR-based triple loop are analyzed in detail while considering the system stability and dynamic transients. The mode transfer techniques are described in detail for both sudden unintentional islanding and islanded mode voltage quality improvements. In addition, they are described using the proposed indirect control structure. The proposed method is verified by the PSiM simulations and laboratory-scale VDER-HILS experiments.
마이크로그리드 독립 운전 모드시 고조파 보상을 고려한 출력 전압 제어 방식 연구
임경배(Kyungbae Lim),김동환(Donghwan Kim),최재호(Jaeho Choi),장주영(Juyoung Jang),이정흠(Junghum Lee),김재식(Jaesig Kim) 대한전기학회 2014 대한전기학회 학술대회 논문집 Vol.2014 No.4
본 논문은 계통 연계형 인버터가 독립 운전모드에서 동작할 때의 비례공진 제어기를 활용한 인버터 출력 전압 제어 방식에 대해 다루고 있다. 분산 전원 기반의 마이크로그리드가 독립 운전 모드로 전환될 경우 마이크로그리드는 분산 전원만으로 전체 지역적 부하를 담당해야 하는 의무를 지니게 된다. 따라서 이때 마이크로그리는 전압원으로 가정되며 이를 위해 전압 제어가 수행되어져야 하며 담당하고 있는 부하가 불평형 또는 비선형 부하 일 경우 역상차, 영상차, 특정 차수의 고조파가 발생되기 때문에 기존의 전압 제어 방식을 사용할 경우 출력 전압에 높은 고조파가 발생하여 전압 THD품질이 저하되며 이는 부하의 성능을 저해하는 요소로 작용한다. 따라서 본 논문에서는 기존에 많이 사용되는 비례적분제어기 대신 특정 주파수에서 높은 제어 게인을 갖게 하는 비례공진제어기를 다중으로 연결한 비례 다중 공진제어기를 선정하여 비선형-불평형 부하 연결에 의한 악영향에 대처하고자 하였다. 비례 다중 공진제어에 의한 출력 전압 THD개선 효과는 PSIM Simulation Tool을 통해 검증되었다.