考虑机网协调的阻尼优化控制系统研究

Optimal Damping Control Systems Based on Coordination Between Units and Grid

随着电力系统规模的不断扩大,小干扰稳定已经成为影响电力系统安全稳定的重要因素之一。为了有效地阻尼电力系统的小扰动振荡,提出了基于机网协调优化的阻尼控制方法。借鉴混成控制系统的思想与理念,考虑自动发电控制和自动电压控制系统之间的协调,建立了分层控制的阻尼协调优化控制系统。该系统将电力系统的阻尼强弱作为事件形成的指标,并以事件驱动作为系统调节的触发机制。该阻尼协调优化控制系统不仅能消除系统的弱阻尼模式,而且有效解决了传统自动发电控制和自动电压控制系统之间相互作用而导致的负面影响,实现了2套自动控制系统的控制指令的优化协调。在IEEE 5机14节点系统上进行多种运行方式下的仿真研究,仿真结果验证了所提方法的正确性和有效性。

With the constant expansion of power systems, small signal stability is one important factor on power system security and stability. In order to effectively damping power system oscillations of small disturbance, this paper presented a damping control system based on coordinated optimization between generator units and power grid. Using hybrid control system ideas and concepts, this paper considered the coordination between automatic generation control （AGC） system and automatic voltage control （AVC） system, and set up a hierarchical coordinated optimal damping control （CODC） system. The CODC system used the power system damping strength as indicators of the formation of the event, and used discrete event-driven as adjustable trigger mechanism. The CODC system can improve the weak damping, and effectively overcome the negative interaction between traditional AGC and AVC system caused by the coupling of active and reactive power. And this system achieves optimized coordination instructions between AGC and AVC. Finally, as an illustration, the proposed method was applied to the IEEE 5-machine 14-node system under various operation states, and the computer simulation results demonstrate the effectiveness of the proposed theory and method.