文章摘要
年珩,教煐宗,孙丹.基于虚拟同步机的并网逆变器不平衡电压灵活补偿策略[J].电力系统自动化. DOI: 10.7500/AEPS20180529006.
NIAN Heng,JIAO Yingzong,SUN Dan.An Unbalanced Voltage Flexible Compensation Strategy for Grid-connected Inverter Based on Virtual Synchronous Generator[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20180529006.
基于虚拟同步机的并网逆变器不平衡电压灵活补偿策略
An Unbalanced Voltage Flexible Compensation Strategy for Grid-connected Inverter Based on Virtual Synchronous Generator
DOI:10.7500/AEPS20180529006
关键词: 不平衡电网  虚拟同步机  不平衡电压抑制  电能质量  
KeyWords: unbalanced grid  virtual synchronous generator  unbalanced voltage compensation  power quality
上网日期:2018-12-06
基金项目:
作者单位E-mail
年珩 浙江大学电气工程学院 nianheng@zju.edu.cn 
教煐宗 浙江大学电气工程学院 jyzzju@zju.edu.cn 
孙丹 浙江大学电气工程学院 sundan@zju.edu.cn 
摘要:
      摘要:电力电子设备大量地接入电网,给电网带来了系统惯量和阻尼降低等问题。为了提高不平衡电网频率稳定性和改善电网电压的电能质量,本文提出了基于虚拟同步机的不平衡电压灵活补偿控制策略。通过采用虚拟同步控制,在电网频率波动时提供有功功率支撑,提高电网频率稳定性。通过采用负序电压前馈补偿,抑制公共连接点不平衡电压,改善电能质量。本文通过建立不平衡电网下的虚拟同步机模型,提出采用电压前馈的不平衡电压抑制策略。进而,分析了采用电压前馈补偿策略的控制性能,研究不平衡电压补偿系数的设定方法。本文提出的控制方法可根据电网电压不平衡度的控制目标和设备剩余容量自动地调整不平衡电压补偿系数,实现不平衡度灵活调节。最后,通过仿真结果验证所提控制策略的正确性和有效性。
Abstract:
      Abstract: With a large number of power electronics devices are connected to the power grid, there are problems such as inertia and damping decreasing. To improve the frequency stability and power quality of the unbalanced grid, this paper proposed a grid-connected inverter’s unbalanced voltage compensation control strategy based on virtual synchronous generator (VSG). When the grid’s frequency is oscillating, VSG can provide active power support to enhance the stability of power system. By using the negative sequence voltage feed-forward compen-sation control, it can restrain the unbalanced voltage at the point the of common coupling and improves the pow-er quality. By building the model of VSG under unbalanced grid, this paper proposes an unbalanced voltage sup-pression method using the voltage feed-forward compensation. Then, it analyzes the performance of voltage feed-forward compensation and study the compensation coefficient setting method. The method can realize flexible control, which changes the compensation coefficient automatically according to the goal of voltage un-balanced factor and the remaining capacity of instrument. At last, simulation results validate the correctness and effectiveness of proposed control strategy.
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