CAJ | 학술논문

向电网传送有功电能的并网逆变器结构简单，但不能控制和改善电网中的电能质量。针对分布式发电中源/荷的不确定性问题，该文基于配电网静止同步补偿器(distribution static synchronous compensator，DSTATCOM)，采用类似于交流电机磁链观测的方法，构造出虚拟电机磁链作为逆变器的定向矢量，既能省掉交流侧电压传感器，又能滤除一部分谐波；同时，abc自然坐标控制实现了有功和无功的独立控制，无需任何坐标变换，计算简单，易于实现，节约时间。仿真和实验结果均表明无电压传感器的虚拟电机自然坐标控制策略能够有效维持公共耦合点(point of common coupling，PCC)电压的稳定。系统能够快速补偿无功电流，具有良好的动、静态特性和鲁棒性。
향전망전송유공전능적병망역변기결구간단，단불능공제화개선전망중적전능질량。침대분포식발전중원/하적불학정성문제，해문기우배전망정지동보보상기(distribution static synchronous compensator，DSTATCOM)，채용유사우교류전궤자련관측적방법，구조출허의전궤자련작위역변기적정향시량，기능성도교류측전압전감기，우능려제일부분해파；동시，abc자연좌표공제실현료유공화무공적독립공제，무수임하좌표변환，계산간단，역우실현，절약시간。방진화실험결과균표명무전압전감기적허의전궤자연좌표공제책략능구유효유지공공우합점(point of common coupling，PCC)전압적은정。계통능구쾌속보상무공전류，구유량호적동、정태특성화로봉성。
The structure of grid-connected inverters which transport active power to grids is simple, but it cannot control or improve power quality. Focusing on uncertainty of sources and loads for distributed generation, based on distribution static synchronous compensators (DSTATCOMs), virtual-machine- flux vectors which may serve as the oriented vectors of the inverters were similarly constructed in this paper according to the observations of flux linkages in AC motors. As a result, the AC voltage sensors are cancelled and some of harmonic is eliminated effectively. Meanwhile, the independent control for active and reactive power is implemented in theabc natural coordinate. The method is simple, saving time, and do not need to change the coordinate. It can keep the voltages constant at the point of common coupling (PCC). Simulation and experimental results verify the effectiveness of the proposed reactive power compensation technique without voltage sensors in the abc natural coordinate. The system can produce compensated reactive currents quickly, and has excellent dynamic and static performances.