一种基于数字孪生的虚拟同步机与静止同步补偿器优化协调控制策略研究

A Digital Twin-based Optimal Coordinated Control Strategy for Virtual Synchronous Generator and STATCOM

当电网发生严重不平衡电压跌落时,虚拟同步机通常配置静止同步补偿器应对电压支撑不足、电流越限等问题。在实际应用中同步机和补偿器之间的协调控制严重依赖实时通信。因此,文章提出了一种基于数字孪生技术的虚拟同步机和静止同步补偿器的优化协调控制策略。首先,建立基于正负序电流控制结构,支撑新能源场站并网点的电压。其次,提出了改进的多目标协调控制策略,实现电压支撑、电流限制和有功功率输出等多个控制目标。再次,建立基于数字孪生的虚拟同步机与静止同步补偿器协调控制模型,应对现实中协调控制通信延时问题。最后,通过使用MATLAB仿真平台,验证了该方法的有效性。

When severe unbalanced voltage dips occur in power grids,a virtual synchronous generator(VSG)is usually configured with a static synchronous compensator(STATCOM)to cope with problems such as insufficient voltage support and current overrun.The coordinated control between STATCOM and VSG in real situations relies heavily on real-time communication.Therefore,the article proposes an optimized coordinated control strategy for VSG and STATCOM based on digital twin technology.Firstly,positive and negative sequence current control structures are established to support the voltage at the grid connection point of renewable energy stations.Then an improved multi-objective coordinated control strategy is proposed to achieve multiple control objectives including voltage support,current limitation,and active power output.Furthermore,a coordinated control model of VSG and STATCOM based on the digital twin is constructed to address the real-life coordinated control communication delay problem.Finally,the effectiveness of the method is verified by using the MATLAB simulation platform.