不对称电网故障下双馈风电机组的控制策略研究
首发时间:2018-06-11
摘要:在电网电压发生不对称跌落时,双馈风力发电机组的电磁转矩和向电网输送的功率会产生二倍频的波动,导致风电机组对直流母线电压控制能力下降。为消除电网不对称故障对双馈发电机组带来的不利影响,建立了双馈风力发电机组的电磁暂态模型,分析了双馈机组在电网电压不对称情况下的电压和功率特性,提出了转子侧变换器和网侧变换器的协同控制策略,保证电网和风机运行的稳定。仿真结果表明,该控制策略可以抑制由电网电压不对称跌落引起的风电机组电磁转矩、输出功率及直流母线电压的二倍频脉动等多个控制目标,使得风电机组能够在电网电压不对称状态下更加稳定地运行。
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Control Strategy of DFIG Under Asymmetric Grid Fault
Abstract:When the power grid voltage occurs asymmetrically, the electromagnetic torque of the DFIG and the power sent to the power grid will produce two frequency doubling, which leads to the decrease of the DC bus voltage control capability. In order to eliminate the adverse effects of power grid asymmetrical fault on doubly fed generator set, the electromagnetic transient model is established in this paper. The voltage and power characteristics of the doubly fed unit under the voltage asymmetry of the power grid are analyzed. The coordinated control strategy of the rotor side converter and the network side converter is proposed to guarantee the electricity. The simulation results show that the control strategy can suppress multiple control targets, such as the electromagnetic torque, output power and the two frequency pulsation of the DC bus voltage caused by the asymmetrical voltage drop , so that the wind turbine can run more steadily.
Keywords: DFIG Asymmetric fault Electromagnetic transient Coordinated control
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不对称电网故障下双馈风电机组的控制策略研究
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