CAJ | 학술논문

　　不平衡电网电压条件下并网逆变器的有效控制，对提高其并网运行能力具有重要意义。提出一种新型调节器，即比例积分–降阶谐振(proportion integral plus reduced order resonant，PI-ROR)调节器，可以对交流信号进行无差控制，且易于数字化实现。不平衡电网电压条件下，该电流调节器可直接在正向同步旋转坐标中对输出电流进行无差控制，无需进行电流的正、负序分解。通过仿真和实验验证采用该调节器对不平衡电流控制的可行性，并对比该调节器与PI调节器的不平衡控制性能。仿真和实验结果表明，基于提出的PI-ROR调节器的不平衡控制方案可改善并网逆变器的动态性能，提高系统在电网电压不平衡条件下的运行能力。
　　불평형전망전압조건하병망역변기적유효공제，대제고기병망운행능력구유중요의의。제출일충신형조절기，즉비례적분–강계해진(proportion integral plus reduced order resonant，PI-ROR)조절기，가이대교류신호진행무차공제，차역우수자화실현。불평형전망전압조건하，해전류조절기가직접재정향동보선전좌표중대수출전류진행무차공제，무수진행전류적정、부서분해。통과방진화실험험증채용해조절기대불평형전류공제적가행성，병대비해조절기여PI조절기적불평형공제성능。방진화실험결과표명，기우제출적PI-ROR조절기적불평형공제방안가개선병망역변기적동태성능，제고계통재전망전압불평형조건하적운행능력。
The effective control of grid-connected inverters (GCI) under unbalanced grid voltages is very important to improve the grid-connected operation of the inverters. This paper proposes a novel controller, proportion integral plus reduced order resonant (PI-ROR) controller, which can achieve zero error output adjustment to the AC signals, and can easily be digitally realized. The PI-ROR controller, which does not require any decomposition of positive-and negative-sequence currents, can achieve zero current error control in the positive synchronous rotating reference frame directly. The feasibility of adopting the PI-ROR controller to control the unbalanced current, and the control performances of the PI-ROR and PI controller are verified by the simulations and experiments. Results show that the PI-ROR control scheme is capable of realizing the unbalance control targets with excellent transient performances. Therefore, the fault operation capability of GCI under unbalanced grid voltages is enhanced.