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低压微电网改进控制策略研究

Research on improved control strategy in low-voltage microgrid

中文摘要英文摘要

低压微电网中,受线路阻抗影响传统P-V下垂控制不能使有功功率按容量比分配,系统电压不能二次恢复。本文分析了传统P-V下垂控制的不足;阐释了有功功率在无P-V下垂环节时的分配规律;提出一种改进控制策略:引入一种与频率相关的新型虚拟阻抗,结合分布式UPS系统中的控制方法与传统Q-f下垂控制,使有功功率按容量比分配,并维持了公共耦合点(PCC)电压的稳定。研究了系统带非线性负载的运行情况,改进控制策略能在不影响基频电流分配的前提下使多数高次谐波电流由指定逆变器提供。仿真结果验证了本文所提改进控制策略的有效性和可行性。

In low-voltage microgrid, due to the influence of line impedance, conventional P-V droop control cannot achieve the capacity ratio distribution of the active power and the recovery of voltage cannot be realized. The article analyzes the shortcoming of conventional P-V droop control, explains the distribution law of active power without P-V droop link. An improved control strategy is proposed: introducing the new virtual impedance associated with frequency, combined with control of distributed uninterruptible power supply (UPS) systems and conventional Q-f droop link. In the strategy, the capacity ratio distribution of the active power would be achieved. Meanwhile, the voltage in point of common coupling (PCC) can be maintained. When the microgrid system running with nonlinear load, improved control strategy makes the most of the harmonic current provided by the designated inverter without affecting the distribution of fundamental current and the simulation results show that the improved control strategy is feasible and effective.

徐远洋、王明渝

独立电源技术

电力电子与电力传动低压微电网功率分配新型虚拟阻抗非线性负载

power electronics and power driveslow-voltage microgridpower distributionnew virtual impedancenonlinear load

徐远洋,王明渝.低压微电网改进控制策略研究[EB/OL].(2018-01-15)[2025-08-18].http://www.paper.edu.cn/releasepaper/content/201801-87.点此复制

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