向弱电网供电的VSC-HVDC系统的模拟惯量控制策略研究
发布时间：2018-10-16 17:48
【摘要】：针对采用VSC-HVDC向弱电网供电时,受端弱电网惯量不足而出现扰动下暂态频率偏移较大的问题,提出了一种模拟惯量控制策略,以增大受端弱电网的惯量,从而提高系统的频率质量。为此,在对比换流站直流侧电容和同步发电机转子储能特性的基础上,建立了直流电压与系统频率的映射关系,从而得出了换流站所模拟惯量的具体计算等式。利用PSCAD/EMTDC就三种扰动下对VSC-HVDC逆变侧换流站分别采用传统控制和所提模拟惯量控制时进行了仿真比较。仿真结果表明,所提模拟惯量控制策略能够减小扰动下受端弱电网暂态频率偏移,提高受端弱电网的频率质量。
[Abstract]:In order to solve the problem of large transient frequency offset caused by weak grid inertia at receiving end when VSC-HVDC is used to supply power to weak power network, an analog inertia control strategy is proposed to increase the inertia of receiving weak grid. Thus, the frequency quality of the system is improved. On the basis of comparing the DC side capacitance of converter station with the energy storage characteristics of synchronous generator rotor, the mapping relationship between DC voltage and system frequency is established, and the concrete calculation equation of the simulated inertia of converter station is obtained. In this paper, PSCAD/EMTDC is used to simulate and compare the conventional control and the proposed simulated inertia control for the VSC-HVDC inverter side converter station under three disturbances. The simulation results show that the proposed simulation inertia control strategy can reduce the transient frequency offset of the receiving weak current network under disturbance and improve the frequency quality of the receiver weak current network.
【作者单位】： 中国南方电网超高压输电公司柳州局;
【分类号】：TM721.1
本文编号：2275160
[Abstract]:In order to solve the problem of large transient frequency offset caused by weak grid inertia at receiving end when VSC-HVDC is used to supply power to weak power network, an analog inertia control strategy is proposed to increase the inertia of receiving weak grid. Thus, the frequency quality of the system is improved. On the basis of comparing the DC side capacitance of converter station with the energy storage characteristics of synchronous generator rotor, the mapping relationship between DC voltage and system frequency is established, and the concrete calculation equation of the simulated inertia of converter station is obtained. In this paper, PSCAD/EMTDC is used to simulate and compare the conventional control and the proposed simulated inertia control for the VSC-HVDC inverter side converter station under three disturbances. The simulation results show that the proposed simulation inertia control strategy can reduce the transient frequency offset of the receiving weak current network under disturbance and improve the frequency quality of the receiver weak current network.
【作者单位】： 中国南方电网超高压输电公司柳州局;
【分类号】：TM721.1
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