文章摘要
黄林彬,辛焕海,黄伟,等.含虚拟惯量的电力系统频率响应特性定量分析方法[J].电力系统自动化,2018,42(8):31-38. DOI: 10.7500/AEPS20170605010.
HUANG Linbin,XIN Huanhai,HUANG Wei, et al.Quantified Analysis Method of Frequency Response Characteristics for Power Systems with Virtual Inertia[J].Automation of Electric Power Systems,2018,42(8):31-38. DOI: 10.7500/AEPS20170605010.
含虚拟惯量的电力系统频率响应特性定量分析方法
Quantified Analysis Method of Frequency Response Characteristics for Power Systems with Virtual Inertia
DOI:10.7500/AEPS20170605010
关键词: 虚拟同步机  虚拟惯量  频率响应  逆变器
KeyWords: virtual synchronous machines  virtual inertia  frequency response  inverters
上网日期:2018-02-27
基金项目:国家重点研发计划资助项目(2017YFB0902000)
作者单位E-mail
黄林彬 浙江大学电气工程学院, 浙江省杭州市 310027  
辛焕海 浙江大学电气工程学院, 浙江省杭州市 310027 xinhh@zju.edu.cn 
黄伟 云南电网有限责任公司调度控制中心, 云南省昆明市 650011  
杨欢 浙江大学电气工程学院, 浙江省杭州市 310027  
汪震 浙江大学电气工程学院, 浙江省杭州市 310027  
摘要:
      虚拟同步机可以使并网逆变器具有类似于同步发电机的外特性,从而使逆变器参与频率调节并为电力系统增加虚拟惯量。但目前,对于含虚拟惯量的电力系统的频率响应特性缺少定量的刻画指标,难以从理论上指导大规模电力电子设备接入时虚拟惯量的优化配置,也无法从理论上刻画虚拟惯量的加入对于电力系统频率响应特性的影响。针对这一问题,提出以系统相位扰动到频率输出的闭环传递函数(或传递函数矩阵)的H2与H∞范数作为描述系统频率响应特性的指标,从而定量刻画虚拟惯量的加入对系统频率的扰动抑制能力的影响。在此基础上,分析了同步发电机和虚拟同步机的频率响应特性,并进一步结合频率响应的时域波形验证该指标的有效性。
Abstract:
      Grid-connected power inverters can be operated as virtual synchronous machines to mimic the characteristics of synchronous generators. In this manner, the inverter can participate in the frequency regulation and add virtual inertia to power systems. However, there is no index to describe the frequency response characteristics of power systems with virtual inertia provided so far, which results in the difficulty in optimizing the allocation of virtual inertia among virtual synchronous machines as well as evaluating the influence of virtual inertia on the frequency response characteristics of power systems. To deal with this problem, the H2 and H∞norms of the closed-loop transfer function(from angle perturbation input to frequency output)are utilized to describe the frequency response characteristics of the system. On this basis, the frequency response characteristics of conventional synchronous generator and virtual synchronous machine are analyzed. Furthermore, time-domain waveforms of frequency response verify the effectiveness of the method.
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