多机系统中STATCOM与发电机励磁的非线性分散协调控制设计

Nonlinear Decentralized Coordinated Control of STATCOM and Generator Excitation for Multi-Machine Power Systems

针对含静止同步补偿器(static synchronous compensator,STATCOM)的多机系统中,STATCOM与发电机励磁协调控制问题,引用目标全息反馈方法,进行非线性协调控制设计。首先,建立了多机系统下含STATCOM的微分代数模型;其次,运用目标全息反馈方法,设计出STATCOM与励磁的分散协调控制律。该控制律仅需要测量控制对象的本地物理量,不需要采集异地物理量,具有很好的鲁棒性。控制律设计过程中发现,目标全息反馈方法不仅适用于非线性微分系统的控制问题,同样适用于非线性微分代数系统控制律的设计。最后,以3机9节点系统为例,进行仿真验证所提方案的有效性。仿真结果表明,多种扰动类型下,该控制律不仅能很好改善系统功角稳定,而且能保证发电机端电压和STATCOM连接点电压快速实现无差调节。

The coordinated control problem of static synchronous compensator（STATCOM） and generator excitation for multi-machine power systems is discussed in this paper based on nonlinear control with objective holographic feedbacks（NCOHF）. Firstly, the model of nonlinear system with algebraic constraint equations composed by the multi-machines and a STATCOM is established. Secondly, the nonlinear decentralized coordinated control with objective holographic feedbacks（NDCOHF） is proposed. For the local measurements are only needed instead of remote information, NDCOHF has a good robust performance. Additionally, NCOHF is extended to solve the control problems of nonlinear differential algebraic system（NDAS）, besides of solving problems of nonlinear differential system. Finally, the simulation is made on a three-machine power system to demonstrate the effectiveness of the method proposed in this paper. The result shows that the proposed method can achieve better of the generators＇ rotor stability and the better regulation of generators＇ terminal voltage and the STATCOM＇s terminal voltage without static error under different disturbances.