摘要
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。
As the interconnection of power networks becoming increasingly meshed, the assumption of weak coupled reactive power and voltage control between areas is no longer correct. If regional control systems operate uncoordinatedly, some adverse consequences may occur, such as unreasonable reactive power distribution, control oscillation or even instability. Based on sensitivity analysis, a new coordination variable named VACE is proposed. The new coordination variable can distinguish whether a disturbance occurs inside or outside the region and indicate the magnitude and direction of reactive power exchange. Using VACE as an examination index, coordinated AVC can be implemented easily： The responsibility of control is clear and the negative effect between different AVC systems can be reduced. The simulation results of the New England System show that with VACE index under consideration, control oscillation is effectively attenuated and higher reactive power reserve is achieved.
出处
《电力系统自动化》
EI
CSCD
北大核心
2009年第14期22-26,共5页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50525721)~~
关键词
自动电压控制
协调变量
考核指标
区域电压控制偏差
automatic Voltage control （AVC）
coordination variable
examination index
voltage/Var area control error（VACE）
