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重庆大学电气工程学院,重庆市 400044
欧阳金鑫(1984—),男,通信作者,博士,副教授,博士生导师,主要研究方向:新能源电力系统故障分析与保护控制、高压直流输电系统控制等。E-mail:jinxinoy@163.com
余建峰(1994—),男,博士研究生,主要研究方向:新能源电力系统保护控制、风电机组频率控制等。E-mail:qinyjf@163.com
张澳归(1999—),男,硕士研究生,主要研究方向:新能源电力系统保护控制、风电机组频率控制等。E-mail:aogui123456@gmail.com
收稿:2023-08-20,
修回:2024-02-20,
网络出版:2024-03-20,
纸质出版:2024-04-25
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欧阳金鑫,余建峰,张澳归等.电网故障下含直驱风电机组的电力系统频率动态响应分析[J].电力系统自动化,2024,48(8):111-121.
OUYANG Jinxin,YU Jianfeng,ZHANG Aogui,et al.Analysis of Dynamic Frequency Response for Power Systems with Direct-drive Wind Turbines Under Power Grid Fault[J].Automation of Electric Power Systems,2024,48(8):111-121.
欧阳金鑫,余建峰,张澳归等.电网故障下含直驱风电机组的电力系统频率动态响应分析[J].电力系统自动化,2024,48(8):111-121. DOI: 10.7500/AEPS20230820002.
OUYANG Jinxin,YU Jianfeng,ZHANG Aogui,et al.Analysis of Dynamic Frequency Response for Power Systems with Direct-drive Wind Turbines Under Power Grid Fault[J].Automation of Electric Power Systems,2024,48(8):111-121. DOI: 10.7500/AEPS20230820002.
电网受扰后基于模型解析的频率响应分析对电力系统安全评估与紧急控制具有重要意义。电网发生故障时,直驱风电机组(DDWT)并网点电压幅值跌落引发控制器暂态响应,同时电压相位突变引发锁相暂态响应,锁相暂态响应又通过变流器控制传导产生功率控制误差,可能导致现有以负荷突变场景为对象的频率特性分析产生较大偏差。为此,提出了电网故障下DDWT锁相偏差的量化方法;解析了锁相偏差经DDWT变流器控制的传导路径,提出了锁相暂态响应导致DDWT功率控制误差的机理及其计算方法;建立了电网故障下含DDWT的电力系统频率响应模型,提出了锁相暂态响应影响下系统频率变化率和最大频率偏差的计算方法,解析了电网故障下考虑DDWT功率控制误差的电力系统频率动态响应特性,并通过算例分析验证了所提方法的有效性。
Model analysis based frequency response analysis after the power disturbance is important for the security assessment and emergency control of power systems. When the power grid fault occurs
the magnitude drop of the grid-connected voltage of direct-drive wind turbine (DDWT) causes the transient response of the controller . Meanwhile
the sudden change in the voltage phase triggers the transient response of the phase-locked loop (PLL)
which generates the power control error through the converter control conduction. And the power control error may lead to a large deviation in the existing frequency characteristic analysis targeting the sudden load change scenarios. Therefore
a quantification method for the phase-locked deviation of DDWT under the power grid fault is proposed. The conduction paths of phase-locked deviation through converter control of DDWT are analyzed. Also
the mechanism and calculation method for the power control error of DDWT caused by the transient response of the PLL are proposed. The frequency response model of the power system with DDWT under the power grid fault is established
and the calculation method for the rate of change of frequency and the maximum frequency deviation under the influence of the transient response of the PLL is proposed. The frequency dynamic response characteristics of the power system considering the power control error of DDWT under the power grid fault are analyzed. Finally
the effectiveness of the proposed method is verified through case studies.
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