交直流混合微电网母线接口参数自适应VSG控制策略

针对交直流混合微电网的母线接口变换器采用传统VSG控制策略时存在母线频率的超调量与暂态过程时间矛盾,以及传输功率的暂态过程长期处于超调状态问题,提出一种交直流混合微电网母线接口参数自适应VSG控制策略。该控制策略可以使接口变换器的传输功率、母线频率的超调量减小;可以优化系统的动态调节能力,进而缩短暂态过程。建立了符合母线接口变换器VSG的数学模型,在VSG数学模型的基础上引出了参数自适应VSG控制策略。通过仿真,对比参数自适应VSG控制策略与传统VSG控制策略的控制效果,验证了所提出的控制策略的有效性和可行性。

Adaptive VSG control strategy for interlinking converter in an AC/DC hybrid microgrid

When the traditional Virtual Synchronous Generator (VSG) control strategy is adopted for a bus interlinking converter of an AC/DC hybrid microgrid, there is a contradiction between the overshoot of bus frequency and the transient process time. In addition the transmission power transient process is in overshoot state for a long time. Thus an adaptive VSG control strategy for AC/DC hybrid microgrid bus interlinking parameters is proposed. This control strategy can reduce the overshoot of the transmission power of the interlinking converter and the bus frequency. It can optimize the dynamic adjustment capability of the system, thereby shortening the transient process. A mathematical model conforming to the VSG of the bus interlinking converter is established, and a parameter adaptive VSG control strategy is derived on the basis of the VSG mathematical model. Through simulation, the control effect of traditional VSG control strategy and parameter adaptive VSG control strategy is compared, and the practicability and availability of the proposed control strategy is verified. This work is supported by the National Natural Science Foundation of China (No. 51607031) and Jilin Science and Technology Innovation Development Project (No. 20190104138).