CAJ | 학술논문

大量存在的并网逆变器会对分布式发电系统的电能质量和系统稳定性造成深刻影响，该文基于阻抗分析方法研究光伏并网逆变器与电网间的交互影响。论文定量分析光伏并网逆变器与电网之间由于阻抗交互影响所产生的谐波振荡，并通过基于硬件在环的分布式发电综合实验平台验证不同电网接入条件对并网逆变器稳定性的影响；推导LCL型并网逆变器的系统阻抗模型，并提出一种基于电压前馈的主动阻抗控制策略来提高逆变器与电网之间的稳定相角裕度，使光伏并网逆变器在不同的动态电网条件下均具有较好的控制鲁棒性；最后给出阻抗主动调整控制策略的设计过程和参数设计方法，并通过仿真验证主动阻抗控制策略的有效性。
대량존재적병망역변기회대분포식발전계통적전능질량화계통은정성조성심각영향，해문기우조항분석방법연구광복병망역변기여전망간적교호영향。논문정량분석광복병망역변기여전망지간유우조항교호영향소산생적해파진탕，병통과기우경건재배적분포식발전종합실험평태험증불동전망접입조건대병망역변기은정성적영향；추도LCL형병망역변기적계통조항모형，병제출일충기우전압전궤적주동조항공제책략래제고역변기여전망지간적은정상각유도，사광복병망역변기재불동적동태전망조건하균구유교호적공제로봉성；최후급출조항주동조정공제책략적설계과정화삼수설계방법，병통과방진험증주동조항공제책략적유효성。
The power quality and system stability in Distributed Generation (DG) systems are important issues with the far-ranging application of grid-connected inverters. The study of the dynamic interaction between PV Grid-Connected inverters and the grid based on impedance analysis was presented in this paper. The harmonic resonance due to the impedance interaction between PV inverters and the grid was analyzed in quantity, and the effect of the grid impedance on the stability of PV inverters was evaluated through the hardware-in-loop DG test-bed system. The impedance modeling of LCL type PV inverter was derived in the paper. In order to increase the phase margin of the impedance ratio, a novel active impedance control was proposed, which is beneficial to improve control robustness of PV inverters under different grid impedance conditions. The operation principle and design of the active impedance control were depicted, and the control performance was verified by the simulation evaluation.