平衡节点无功约束的连续潮流法静态负荷裕度  

Load Margin Calculation Considered Reactive Power Limitation of Slack Bus Based on CPF Method

作　　者：苗峰显[1] 白雪峰[1] 郭志忠[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《高电压技术》2009年第4期931-936,共6页High Voltage Engineering

基　　金：哈尔滨工业大学科研创新基金(HIT.NSRIF.2008.54)~~

摘　　要：为了分析发电机无功约束对负荷裕度和临界电压的影响,基于连续潮流算法提出了平衡节点无功约束的负荷裕度方法。该方法克服了传统连续潮流算法中因忽略平衡节点无功约束问题或更换平衡节点而造成的负荷裕度和临界电压计算不准确的弊端。该算法对达到无功约束极限的平衡节点采用了节点类型转换方法即由Vθ节点转换为Qθ节点,通过负荷节点功率变动态导纳方法,解决了电力系统天网性质造成的节点导纳矩阵病态问题。通过New England-39 Bus算例仿真表明,平衡节点无功约束减小了负荷裕度,加速了系统电压崩溃。该算法概念清晰,计算简单,具有较好的合理性与实用性。In order to analyze the effect of reactive power limitation of generation on load margin and critical voltage, based on continuation power flow method, a load margin method considered reactive power limitation of slack bus was proposed. The disadvantages of inaccuracy of load margin and critical voltagel which is caused by neglecting reactive power limitation of slack bus or replacing slack bus in traditional continuation power flow method, are conquered. When the slack bus reaches its reactive power maximum value, a bus type change method, i. e. , the VO bus is turned to Qθ bus, is proposed. Through converting load power to dynamic admittance, the ill-conditioned nodal admittance matrix of power system due to the weakness connection between system bus and reference bus is solved. The numerical tests on NewEngland-39Bus indicate that the load margin is reduced and the voltage collapse is aecelelated because of reactive power limitation of the slack bus. This method has features of clear concept, simple calculation and better reasonability and practicability.

关 键 词：连续潮流 PV曲线 负荷裕度 平衡节点 电压稳定 临界电压 

分 类 号：TM744[电气工程—电力系统及自动化]