|
| 摘要: |
| 针对系统电压主要受无功影响的特点,从能量的角度,首先建立了考虑无功补偿和不考虑无功补偿条件下的节点能量函数模型,然后讨论了无功注入集合、电压和能量之间的关系,以此为基础,提出了基于能量信息的电压稳定性量化方法.该方法以无功注入集合影响下的有效能量为基准,以对应节点电压变化的能量值作为量化电压稳定性的裕度指标.将裕度指标随电压变化的灵敏度作为趋势指标,初步探讨了系统多种运行方式下,即由发电机无功出力、无功负荷以及电容器补偿等不同无功注入成分变化影响下的量化指标变化情况以及电网拓扑结构变化影响下的量化指标变化情况.在IEEE 30母线系统中对所提指标进行仿真,结果验证了该方法对评估电力系统电压稳定性的有效性和可行性. |
| 关键词: 能量信息 启发式能量函数 无功注入集合 电压稳定性 |
| DOI： |
| 分类号:TM712 |
| 基金项目:国家重点基础研究发展计划(973计划) |
|
| Quantification index of voltage stability based on energy information |
|
LIU Qunying LIU Junyong LIU Qifang
|
| Abstract: |
| Since system voltage is mainly influenced by reactive power,the node energy function models,with and without var compensation,are established and the relationships among reactive injection set, voltage and energy are discussed,according to which,the quantification of voltage stability based on energy information is proposed. With the effective energy influenced by reactive injection set as the benchmark,the energy corresponding to node voltage change is taken as the margin index for quantification of voltage stability and its sensitivity to voltage change as the trend index. For different system operating modes,the influence of the reactive injection change,such as generator reactive output, reactive load,compensating capacitor,etc.,and the system topology change on quantification indexes are discussed. The simulation of IEEE 30 - bus system verifies the quantification method for system voltage stability evaluation is effective and feasible. |
| Key words: energy information,heuristic energy function,reactive power injection set,voltage stability |
