变频驱动系统电网接口虚拟同步发电机控制技术

发布时间：2018-06-02 08:08

本文选题：变频驱动 + 电网接口　；参考：《电工技术学报》2015年23期

【摘要】：网侧功率变换器是变频驱动系统接入配电网的重要接口,随着变频驱动系统渗透率的不断提高,网侧功率变换器对配电网中的影响越发突出。借鉴传统电力系统中的同步发电机数学模型,形成电网接口虚拟同步发电机控制方案,设计具有变频驱动系统自身特性的虚拟调速器和虚拟励磁控制器,保证电网电流的低谐波畸变的同时,满足负荷功率需求,并具有响应电网电压/频率异常事件功能,可在一定程度上提高电网的稳定性。同时模拟同步发电机的转动惯量,提高电网接口的惯性和阻尼,降低变频驱动系统对电网的影响,提升电网对大规模变频驱动系统接入的适应性。为实现电网接口的柔性起动,提出一种虚拟同步预并网控制方法,可实现电网接口柔性离/并网切换,消除起动冲击电流。仿真和实验结果表明了所提控制方案的有效性。
[Abstract]:Grid-side power converter is an important interface for frequency conversion drive system to connect to distribution network. With the increasing permeability of frequency conversion drive system, the influence of network side power converter on distribution network becomes more and more prominent. Based on the mathematical model of synchronous generator in traditional power system, the control scheme of virtual synchronous generator with power network interface is formed, and a virtual governor and a virtual excitation controller with the characteristics of frequency conversion drive system are designed. At the same time, it can satisfy the demand of load power and respond to the abnormal event of voltage / frequency of power network. It can improve the stability of power network to a certain extent. At the same time, the moment of inertia of synchronous generator is simulated to improve the inertia and damping of power grid interface, reduce the influence of frequency conversion drive system on power grid, and improve the adaptability of power grid to large-scale frequency conversion drive system. In order to realize the flexible starting of the power network interface, a virtual synchronous pre-grid control method is proposed, which can realize the flexible decoupling / grid-connected switching of the power network interface and eliminate the starting impulse current. Simulation and experimental results show the effectiveness of the proposed control scheme.
【作者单位】：中国矿业大学信息与电气工程学院;
【分类号】：TM921.5;TM46

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