异步发电机带STATCOM装置的多尺度分析及稳压控制优化

Multi-scale Analysis and Stabilization Control Optimization of Asynchronous Generator with STATCOM Device

由于异步发电机带载能力较弱,负载突变对其电压幅值稳定性影响较大,采用静止同步补偿装置(STATCOM)补偿其无功输出可以增强系统鲁棒性。本文以STATCOM为研究对象,应用幅相动力学理论,建立装置的暂态幅相运动方程模型,分析其在系统运行时装置内电势幅值和相位运动的暂态特性,指出现有控制方法上的不足并予以改进。研究发现传统稳压方法下STATCOM仅表现为对系统电压幅值的响应,不响应系统的电压频率即相位动态。通过在直流电压时间尺度下引入系统频率控制,使STATCOM可以同时响应异步发电机系统的电压幅值和相位动态,从而提高整个系统的稳定性。仿真和实验结果验证了该控制策略在多时间尺度下对系统的有效性和正确性。

The sudden change of load has a great influence on the stability of asynchronous generator due to its weakness in loading capacity.Use of static synchronous compensation device(STATCOM)to compensate its reactive power output can enhance the robustness of the system.In this paper,The STATCOM is taken as the study object,the theory of amplitude/phase dynamics is used to establish the transient amplitude phase motion equation model of the device.The transient characteristics of the potential amplitude phase motion of the device during system operation are analyzed,and the shortcomings of the existing control methods are pointed out and improved.It is found by the study that the STATCOM under the traditional voltage stabilizing method only shows the response to the amplitude of the system voltage without responding the voltage frequency of system,namely dynamic.Introduction of frequency control of system under DC voltage scale can keep the STATCOM respond simultaneously voltage amplitude and phase dynamic of asynchronous generator system so to improve stability of the whole system.Both effectiveness and correctness of the control strategy to the system under the multi time scale is verified by the simulation and experimental result.