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针对锦界电厂串补输电工程的多模态次同步谐振(SSR)问题,在基波电纳次同步调制机理基础上,优化设计静止无功补偿器(SVC)次同步阻尼控制器(SSDC)。首先建立适应SSR分析与控制设计、包含SVC的多机系统线性化模型,其次提出了基于独立模态控制思路的控制器结构,然后将控制参数设计问题规范为一个约束型非线性规划问题,进而采用遗传—模拟退火(GASA)算法求解得到控制参数,最后采用特征值分析和时域仿真验证了控制系统的有效性。结果表明:SVC-SSDC能大幅提高机组扭振的模态阻尼,有效抑制SSR,从而保证了机组和电网的安全稳定运行。
Aiming at the multi-mode subsynchronous resonance (SSR) problem of the series transmission project in Jinjian Power Plant, based on the sub-synchronous modulation mechanism of the fundamental wave susceptance, the SSC (SSC) damping controller (SSDC) . Firstly, a controller model based on independent modal control is proposed, which is adaptive to SSR analysis and control design, including SVC multi-machine system linearization model. Secondly, the control parameter design problem is defined as a constrained nonlinear programming problem, and then The control parameters were obtained by genetic-simulated annealing (GASA) algorithm. Finally, eigenvalue analysis and time-domain simulation were used to verify the effectiveness of the control system. The results show that SVC-SSDC can greatly improve the modal damping of turbine torsional vibration and effectively suppress the SSR, thus ensuring the safe and stable operation of the unit and power grid.