摘要
针对电压稳定临界参数的求取方法,以负荷导纳模型方法为基础构建了一种基于变步融合策略求取静态电压稳定临界点处参数的新方法,该策略融合了动态步进性与异步连续性两个进程。动态步进性进程体现为快速计算功率极大值点,即在增加负荷过程中跟踪计算戴维南等值阻抗,并将研究节点当前运行状态点的戴维南等值阻抗对应的导纳值作为下一状态点的负荷导纳值进行下一次计算,故可由初始状态快速、不等步地过渡到最接近临界点的功率极大值点;异步连续性进程体现为由不等步长向等步长方式的过渡且以等步长方式准确求取临界参数,即从功率极大值点开始,利用等步长增或减负荷导纳值的方式计算准确电压稳定临界参数。基于二者有效衔接,提出方向判断系数(Directional Determination Factor,DDF),从而使计算速度和精度得到了有机协调。算例IEEE30、IEEE118验证了该变步融合策略的有效性和正确性,可为研究实时在线电压稳定分析提供一种新的数据参考。
Aiming at methods for the calculation of voltage stability critical parameters, this paper proposes a new changeable step integration strategy for determiuation of critical parameters of static voltage stability based on load admittance model, which integrates dynamic step characteristic progress and asynchronous continuation characteristic progress. Firstly, maximal power point closest to critical point is calculated in the first progress quickly, namely, tracing calculation of the Thevenin＇s equivalent impedance during increasing the loads, then, the corresponding admittance is used as the load admittance value for next calculation. Thus, the transition from initial point to the maximal power point is completed with quick unequal step. The second progress successes after the first progress for transition from unequal steps to equaland exact determination of critical pararnetersbyequal step. namely, themaximum power point can be used as the beginning to compute critical parameters of voltage stability via increasing or reducing the load admittance by equal step. Directional determination factor （DDF） is created to achieve reasonable transition between two progresses, which makes the calculation speed and accuracy organically coordinated. Examples of IEEE30, IEEEll8 show the validity and accuracy of the strategy, which can supply a new tool for real-time analysis of voltage stability.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2011年第16期19-24,共6页
Power System Protection and Control
关键词
电压稳定
PV曲线
变步融合
动态步进
异步连续
临界参数
voltage stability
PV curve
changeable step integration
dynamic step
asynchronous continuation
critical parameters
