| 引用本文: | 郭 挺,杨梓晴,徐良德,等.考虑新能源随机波动和T接线的城市电网连锁故障风险评估[J].电力系统保护与控制,2024,52(13):59-68.[点击复制] |
| GUO Ting,YANG Ziqing,XU Liangde,et al.Risk assessment for cascading failures in urban power grids considering the random fluctuation of renewable energy and T-connected lines[J].Power System Protection and Control,2024,52(13):59-68[点击复制] |
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| 摘要: |
| 新能源的大量接入给城市电网的安全运行和重要用户可靠供电带来很大挑战，其功率的随机波动易引发电网出现连锁故障风险。提出了一种考虑新能源出力随机波动和城市电网110 kV网架T接线开关投切的连锁故障风险评估方法。该方法在连锁故障发生概率和后果严重度的计算中都计及了系统状态的概率分布特性的影响，并采用基于半不变量法的概率潮流计算反映系统状态与新能源功率二者的概率分布特性之间的关系。另外，建立包含110 kV网架T接线开关投切的最小切负荷的混合整数非线性规划模型，并以最小切负荷量来表征系统在连锁故障的严重度。此优化模型通过决策故障下的各组T接线开关的投切状态，减少连锁故障下的切负荷量，进而有效降低连锁故障的风险。同时，通过机会约束描述重要用户负荷节点电压的安全运行范围，以确保重要用户负荷不停电的概率满足给定的置信水平，从而保证重要用户的安全可靠供电。最后，通过某个实际城市片区电网算例验证了所提出的连锁故障风险评估方法的正确有效性。 |
| 关键词: 连锁故障 风险评估 新能源 概率潮流 半不变量 T接线 混合整数非线性规划 |
| DOI：10.19783/j.cnki.pspc.231610 |
| 投稿时间：2023-12-18修订日期：2024-01-30 |
| 基金项目:国家自然科学基金项目资助(51977080)；南方电网公司科技项目资助(GZHKJXM20210047) |
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| Risk assessment for cascading failures in urban power grids considering the random fluctuation of renewable energy and T-connected lines |
| GUO Ting1,YANG Ziqing2,XU Liangde1,HU Linlin1,LIN Shunjiang2,LIU Mingbo2 |
| (1. Guangzhou Power Supply Bureau of Guangdong Power Grid Co., Ltd., Guangzhou 510000, China;
2. School of Electric Power, South China University of Technology, Guangzhou 510640, China) |
| Abstract: |
| Massive penetration of renewable energy brings great challenges to the secure operation and reliable power supply of important users in urban power grids, and it is easy for the random fluctuation of renewable energy power to result in cascading failure risks. A cascading failure risk assessment method for an urban power grid considering the random fluctuation of renewable energy outputs and T-connected line switching in a 110 kV power grid is proposed. The influence of the probability distributions of system states is taken into account in the calculation of the failure probability and consequences, and the probabilistic power flow based on cumulants is used to reflect the relationship of the probability distribution characteristics between the system states and renewable energy outputs. Additionally, a mixed-inter nonlinear optimization model to calculate the minimum load shedding considering the T-connection line switching of 110 kV power grid is established. Minimum load shedding is used to characterize the consequence of cascading failures. By deciding the switching state of each group of T-connection lines under faults, the load shedding in cascading failures can be reduced, and the risk of such failures is effectively decreased. The secure operating range of bus voltage of important user loads is described by chance constraints to ensure that the probability of important user loads without failure meets the given confidence level, so as to ensure the secure and reliable power supply for those users. Finally, the correctness and effectiveness of the proposed cascading failure risk assessment method are demonstrated in an actual urban power grid. |
| Key words: cascading failures risk assessment renewable energy probabilistic power flow cumulants T-connected lines mixed-integer nonlinear programming |
