基于可控等效阻抗的能量路由器无功电压控制策略研究

针对线路的弱阻性/非阻性导致系统调节速度慢、难以稳定运行的问题,提出一种基于可控等效阻抗的能量路由器无功电压控制策略,该策略通过对能量路由器输出特性变化的观察引入虚拟阻抗的控制策略,采用补偿线阻抗的方式将实际阻抗补偿一致,加入电压反馈和频率补偿的等虚拟阻抗关键点,解决了由阻抗等造成的无功功率不均分问题。通过优化功率参考值,提高了光伏等分布式电源并网运行的稳定性。实验结果表明,该控制策略不仅提高了无功分配的精度,而且改善了电能质量。

RESEARCH ON REACTIVE VOLTAGE CONTROL STRATEGY OF ENERGY ROUTERS BASED ON CONTROLLABLE EQUIVALENT IMPEDANCE

To address the problem that the weak resistance/non-resistance of the line leads to slow system regulation and difficult stable operation,this paper observes the change of the output characteristics of the energy router.The strategy introduces the control strategy of virtual impedance,uses the way of compensating the line impedance to compensate the actual impedance,and adds the key points of virtual impedance such as voltage feedback and frequency compensation to solve the problem of uneven distribution of reactive power caused by impedance.By optimizing the power reference value,the stability of grid-connected operation of DGs is improved.Experiments show that the control strategy not only improves the power quality but also the accuracy of the reactive power distribution.