基于电力弹簧的低压台区用户侧电压调节方法

User-Side Voltage Regulation Method for Transformer Areas Based on Electric Spring

针对传统电力弹簧(ES)拓扑结构不能有效解决低压台区因光伏发电倒送引起的用户端电压大范围波动问题,该文提出一种ES拓扑结构以保障用户端负载运行在额定电压。利用相量图法描述ES拓扑结构在容性及感性模式下的工作原理;提出基于比例谐振(PR)控制器的电压闭环控制策略以实现电力弹簧的稳压功能;定量分析ES拓扑工作在恒压及降压运行模式下的判定条件及其对应的稳态运行区间,并将其作为实验装置参数设计的依据。最后,通过实验验证了ES拓扑在白天、夜间两种场景下对低压台区负载端电压调节的可行性和有效性。

The traditional ES topological structure cannot effectively solve the problem of large range fluctuation of user terminal voltage caused by photovoltaic power generation in low-voltage transformer areas.This paper proposes a ES topological structure to ensure that the user terminal load operates at the rated voltage.The principle of the ES topological structure in capacitive and inductive mode is described by phasor graph method.The closed-loop voltage control strategy based on PR controller is proposed to realize the voltage stabilizing function of the ES.The determination conditions and the corresponding steady-state operation interval of the new ES topology under constant voltage and reduction voltage mode are calculated quantitatively,and used as the basis for the parameter design of the experimental device.Finally,experiments have verified the feasibility and effectiveness of the new ES topology for voltage regulation of the load terminal in daytime and at night.