电网对称故障下虚拟同步发电机建模与改进控制

发布时间：2018-04-24 02:17

本文选题：虚拟同步发电机 + 对称故障　；参考：《中国电机工程学报》2017年02期

【摘要】：虚拟同步发电机(virtual synchronous generator,VSG)是近些年新发展的电力电子装备,可为电网提供惯性和动态频率支撑。直接电压式虚拟同步发电机直接通过脉宽调制(pulse width modulation,PWM)产生内电势,无内电流和交流电压控制环,具有更好的动态支撑能力及稳定性;但当电网发生对称短路故障时,直接电压式虚拟同步机无法抑制故障电流,这将危及VSG的安全并限制了直接电压式虚拟同步控制的发展与应用前景。该文将虚拟电阻与相量限流方法相结合,在保证VSG正常运行频率、电压动态支撑的前提下,提出适用于直接电压式VSG的故障电流限制方法。仿真和实验结果证明了所提出的故障电流限制方法的可行性与有效性。
[Abstract]:Virtual synchronous generator (VSG) is a newly developed electric power electronic equipment in recent years, which can provide inertial and dynamic frequency support for the power grid. Direct voltage type virtual synchronous generator produces internal potential directly through the pulse width modulation (pulse width modulation, PWM), without internal current and AC voltage control ring, which is better. Dynamic support capacity and stability, but when a symmetrical short-circuit fault occurs in the power grid, the direct voltage virtual synchronous machine can not suppress the fault current. This will endanger the security of VSG and limit the development and application prospects of direct voltage virtual synchronization control. This paper combines the virtual resistor with the phasor flow restriction method to ensure the normal operation of the VSG. On the premise of frequency and voltage dynamic support, a fault current restriction method suitable for direct voltage type VSG is proposed. The simulation and experimental results prove the feasibility and effectiveness of the proposed fault current restriction method.

【作者单位】：华中科技大学电气与电子工程学院;中国电力科学研究院;
【基金】：国家重点研发计划(2016YFB0900104) 优秀青年基金项目(51322704) 国家自然科学基金重大项目(51361136703)~~
【分类号】：TM31;TM743

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