Using demand response to improve power system voltage stability margins
Using demand response to improve power system voltage stability margins
复制标题
利用需求响应提高电力系统电压稳定裕度
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
D. Molzahn
中科院分区：
文献类型：
--
作者：
Mengqi Yao;J. Mathieu;D. Molzahn
具有波动可再生发电的高渗透率的电力系统可能会在接近其稳定极限时运行。需求响应可以用来提高电力系统的稳定性。例如，它已经被用来提供频率控制，提高了频率稳定性。提出了一种新的需求响应策略，该策略利用快速灵活的负载来改变负载模式，同时保持总负载不变，在不影响系统频率的情况下提高静态电压稳定性。新的负荷模式只维持很短的一段时间，直到发电机可以重新调度。我们的目标是找到一个允许的负荷模式，使潮流雅可比矩阵的最小奇异值最大化，该矩阵用作电压稳定性的衡量标准。利用特征值敏感度和交流潮流方程线性化的迭代线性规划方法求解相应的非凸优化问题。以两个IEEE测试实例为例，我们证明了由该方法得到的载荷模式给出的最小奇异值非常接近于暴力搜索得到的奇异值。计算结果还与由均匀变化功率注入下的最大负荷裕度给出的另一种电压稳定性指标进行了比较。
Electric power systems with high penetrations of fluctuating renewable generation may operate close to their stability limits. Demand response can be used to improve power system stability. For example, it is already used to provide frequency control, improving frequency stability. This paper presents a new demand response strategy that uses fast-acting flexible loads to change the loading pattern while keeping the total load constant, improving steady-state voltage stability without affecting the system frequency. The new loading pattern is maintained only for a short period of time until the generators can be re-dispatched. Our goal is to find a permissible loading pattern that maximizes the smallest singular value of the power flow Jacobian matrix, which serves as a measure of voltage stability. The corresponding non-convex optimization problem is solved with an iterative linear programming approach that uses eigenvalue sensitivities and a linearization of the AC power flow equations. Using two IEEE test cases as illustrative examples, we show that the loading patterns resulting from the proposed approach give smallest singular values that are very close to those obtained from a brute force search. The results are also compared to another voltage stability measure given by the maximum loading margin for uniformly varying power injections.