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随着互联电网的联系不断增强,区域间电压、无功的弱耦合假设将不再成立。基于该假设设计的区域自动电压控制(AVC)系统如果不采取合理的协调策略,可能造成无功分布不合理,甚至控制振荡和不稳定等严重后果。基于对区域间联络线节点灵敏度关系的分析,提出了AVC系统间的一种新的协调变量——区域电压控制偏差(VACE)。该协调变量能够区分出无功扰动发生在本区域还是相邻区域,并能反映出本区域对相邻区域无功影响的方向和大小。利用该协调变量作为考核指标,可以方便地实现区域AVC系统的协调,明确各区域的控制责任,明显减小区域间的相互影响。新英格兰39节点系统的算例仿真说明,考虑VACE指标后,互联区域AVC系统的控制振荡得到抑制,区域发电机无功裕度分布更加均匀合理。
With the interconnection of the interconnected power grid increasing, the weak coupling assumption of voltage and reactive power between regions will not be established any more. The regional automatic voltage control (AVC) system based on this assumption can cause unreasonable distribution of reactive power or even control the serious consequences of oscillation and instability if not adopting a reasonable coordination strategy. Based on the analysis of the sensitivity of inter-area tie-line nodes, a new covariate variable of regional voltage control (VACE) is proposed. The coordination variable can distinguish whether the reactive disturbance occurs in the region or the adjacent region, and can reflect the direction and size of the region’s reactive influence on the adjacent region. Using this coordination variable as an evaluation index, coordination of regional AVC system can be conveniently realized, and the responsibility of control in each area can be clarified, and the inter-regional interaction can be obviously reduced. The simulation results of a New England 39-bus system show that the control oscillation of the AVC system in the interconnected area is restrained and the reactive power margin of the generator in the area is distributed more evenly and reasonably.