CAJ | 학술논문

在包含多微源的微网系统中，微源逆变器输出功率的精确控制和离/并网运行模式下控制目标的自动切换对于微网电压和频率的稳定以及潮流的控制都具有重要意义。在下垂控制的基础上，提出了基于本地测量的自适应双虚拟阻抗和功率补偿导纳控制方法，消除了不同类型线路阻抗引起的功率耦合，改善了离网时负载分配的准确性。同时，通过提出一种自适应的电压补偿方法，实现了分布式电源离/并网运行的统一控制，并改善了离网时的电能质量和并网时输出功率的跟踪精度。通过建立离/并网模式下逆变器的小信号模型，对控制器参数进行了优化设计。仿真和实验结果验证了理论分析的正确性和所提出的控制方法的有效性。
재포함다미원적미망계통중，미원역변기수출공솔적정학공제화리/병망운행모식하공제목표적자동절환대우미망전압화빈솔적은정이급조류적공제도구유중요의의。재하수공제적기출상，제출료기우본지측량적자괄응쌍허의조항화공솔보상도납공제방법，소제료불동류형선로조항인기적공솔우합，개선료리망시부재분배적준학성。동시，통과제출일충자괄응적전압보상방법，실현료분포식전원리/병망운행적통일공제，병개선료리망시적전능질량화병망시수출공솔적근종정도。통과건립리/병망모식하역변기적소신호모형，대공제기삼수진행료우화설계。방진화실험결과험증료이론분석적정학성화소제출적공제방법적유효성。
In a microgrid with multi-microsources,precise output power control and seamless transition of micro-source converters between grid-connected and islanding operation modes are of great significance for the stability of voltage and frequency and the power flow control in a microgrid.The control method of adaptive dual virtual impedances and power compensation conductance based on local voltage and current measurement is proposed,by which active and reactive power control for voltage source inverters(VSIs)can be decoupled and the VSIs can share loads proportionally to their capacity in the islanding mode.Meanwhile,a voltage compensation mechanism is embedded in the droop control,which can refine the power quality in the islanding mode,power control quality in the grid-connected mode,and realize unified control of the microgrid. Furthermore,the parameters of the proposed controller are optimized with small signal models in both grid-connected and islanding modes.Simulation and experiment results have verified the proposed control method.