CAJ | 학술논문

分布式发电是能源互联网的研究重点，并网逆变器是分布式发电系统的核心部分，电容电流反馈有源阻尼广泛应用于LCL型并网逆变器中，其有效地抑制了系统的谐振尖峰。但在数字控制下，电容电流反馈有源阻尼引入的控制延时，将改变系统的相位特性，影响系统的鲁棒性。为此，提出了一种LCL型逆变器的鲁棒延时补偿并网控制方法，包括电容电流反馈延时补偿和增加零极点延时补偿策略，其有效地降低了电容电流反馈有源阻尼中的控制延时，提高了系统的鲁棒性和动态性。以单相LCL型并网逆变器为例，仿真和实验结果验证了所提方法的有效性。
분포식발전시능원호련망적연구중점，병망역변기시분포식발전계통적핵심부분，전용전류반궤유원조니엄범응용우LCL형병망역변기중，기유효지억제료계통적해진첨봉。단재수자공제하，전용전류반궤유원조니인입적공제연시，장개변계통적상위특성，영향계통적로봉성。위차，제출료일충LCL형역변기적로봉연시보상병망공제방법，포괄전용전류반궤연시보상화증가령겁점연시보상책략，기유효지강저료전용전류반궤유원조니중적공제연시，제고료계통적로봉성화동태성。이단상LCL형병망역변기위례，방진화실험결과험증료소제방법적유효성。
Distributed generation is research focus of energy internet. Grid-connected inverter is core part of distributed generation systems. Capacitive-current-feedback active damping widely used in LCL-type grid-connected inverter can effectively inhibits resonant peak. However, control delay is introduced by digital control, and delay element changes system phase-frequency characteristics, affecting system robustness. For this reason, a robust time delay compensated grid-connected control method for LCL-type inverter is proposed in this paper, including delay compensation of capacitive-current-feedback and increasing zero and pole. It can effectively reduce control delay introduced by capacitive-current feedback active damping and improve system robustness and dynamics. Simulation and experiment results with LCL-type single-phase grid-connected inverter verify validity of the proposed strategy.