为避免直流功率的频繁调节，建立了考虑直流调节次数限制的交直流系统动态无功优化模型，并应用广义Benders 分解方法求解． 分解迭代中，将直流功率变量同整数变量一起划分到上层主问题中，这样下层问题能够分解为多个独立的单个时间段面的交直流优化子问题，同时采用一种紧凑的Benders 割将子问题的优化信息传递到主问题中．在逐次线性逼近最优直流输电功率中，提出了一种动态调整直流功率变化步长的策略． 最后以一个实际交直流互联大电网为例，验证了文中算法在限制直流功率调节次数方面的有效性和正确性，同时分析了不同最大调节次数限制取值对交直流动态无功优化结果的影响．

In order to avoid frequent power regulation of DC transmission lines,a dynamic reactive power optimization model of AC /DC power systems,which takes into consideration the DC power regulation limits,is established and then solved by using the generalized Benders decomposition.In the decomposition process,the power variables of DC transmission lines are divided in the master problem together with integer variables,so that the sub-problem can be transformed into a set of independent AC /DC optimization problems in single time section.At the same time,a tightened Benders cut is used to transfer the sub-problem information into the master problem.Moreover,in order to obtain the optimal power of DC transmission lines in a successive linear way,a dynamic step adjustment strategy is proposed.The results on a real large-scale AC /DC interconnection power grid demonstrate the correctness and effectiveness of the proposed method in restricting the regulation times of DC power.Finally,the effect of maximum regulation limit on the dynamic reactivepower optimization results is analyzed.