中文摘要：

随着特高压交/直流混合电网的逐步建成,大区电网间必将存在大功率传输。为了确保电网在其安全稳定极限内正常运行,提出基于多重约束条件下的大区电网间功率交换极限计算方法。该方法采用基于改变的区间交换功率下的频率响应特性分析、静态电压稳定分析、以及暂态能量函数分析对系统功率交换能力进行评估,对比满足各个约束条件的功率交换极限,确定约束系统断面功率交换能力的决定因素,得到多重约束条件下的功率交换极限,并以此来指导区间功率分配方案的制定与优化。对＂三华＂电网的仿真分析表明,该研究所提方法能在考虑多重约束条件前提下快速准确地计算出电网的功率交换极限,计算结果误差均〈6%,满足工程实际的精度要求,且该规划模型在最大交换功率下其特高压输电线路的输送功率在热稳定限制以内。

英文摘要：

Along with the construction of UHV AC/DC hybrid power grids, there is large-capacity transmission of active power between large regional grids. In order to ensure the normal operation of power grid within its limit of security and stability, we proposed a method for calculating the limits of exchanged power between large area power grids based on multiple constraints, and analyzed the frequency response characteristic, static voltage stability, and transient energy function under different exchanged powers so as to evaluate the exchange power＇ s capacity. Moreover, comparing exchanged power limits satisfying various constraints, determining the exchanged power limit of cross section, we obtained the final exchanged power limits based on the multiple constraints, which were adopted to guide the formulation and optimization of interval capacity allocation plans. Simulation and analysis of a power grid indicate that the proposed method can be used to quickly and accurately calculate the limits of exchanged power between grids under the premise of fulfilling multiple constraints, and the errors of the calculation results are below 6%, meeting the requirements of engineering accuracy. Moreover, the transmission power of the programming model＇s UHV transmission lines under the maximum exchange power is within the range of thermal stability limit.