联络线随机功率波动对其输电能力影响的分析方法

An Analytic Method for Impact of Stochastic Tie-line Power Fluctuation on Power Transmission Capability

目前中国华北—华中特高压同步电网正常运行时,特高压联络线上经常会出现较大幅度的随机功率波动现象,有可能对联络线的传输能力造成不良影响。针对这一实际问题,文中在分析特高压联络线随机功率波动的波形、周期、幅值等特性基础上,提出了一种可以定量分析联络线随机功率波动对其输电能力影响的准稳态分析方法。该方法通过在负荷上叠加功率波动来模拟产生特高压联络线功率波动,从而可以计算出联络线功率波动和输电能力之间的定量关系。利用该方法分析了特高压联络线上功率波动对考虑暂态稳定限制时联络线输电能力的影响,研究结果可为特高压同步电网的安全运行提供理论参考。

The stochastic power fluctuation with a large amplitude has frequently emerged on the ultra-high voltage（ UHV） tie-line during normal operation of the interconnected power system in North and Central China,which may result in an adverse impact on the power transmission capability of tie-lines. Based on an analysis of such characteristics of stochastic tie-line power fluctuation as the waveform,the cycle and the amplitude,this paper proposes a quasi-steady-state method for quantitatively analyzing the impact of stochastic power fluctuation on the power transmission capability. The method simulates UHV tie-line power fluctuation by superposing the power fluctuation on the load,then the quantitative relationship between the stochastic UHV tie-line power fluctuation and the power transmission capability can be calculated. The impact of the UHV tie-line power fluctuation on the power transmission capability by considering the transient stability restriction is analyzed with this method. The results can provide theoretical reference to the operation of the UHV synchronous power grid.