| 引用本文: | 李顺,廖清芬,刘涤尘,唐飞.计及电压稳定的自适应协调低频减载策略[J].电力自动化设备,2017,37(12): |
| LI Shun,LIAO Qingfen,LIU Dichen,TANG Fei.Adaptive coordinated low frequency load shedding strategy considering voltage stability[J].Electric Power Automation Equipment,2017,37(12): |
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| 摘要: |
| 为了提高资源利用率，电网经常处在临界稳定的运行状态，大停电事故往往在系统重负荷运行时发生，多表现为多个电气量协同作用下的系统崩溃。提出一种计及电压稳定的自适应协调低频减载策略。根据功率缺额的动态计算值对扰动的严重程度进行分类，以期有针对性地采取不同的控制措施。若发生严重故障则需要进行两阶段的减载，先基于各负荷母线的频率调节效应来指导阶段1的选址定容，然后应用有功网损灵敏度来获取电压薄弱区域信息，计及时延后实施阶段2的减载；若发生一般故障则直接进行阶段2的减载过程。仿真对比验证了所提策略的有效性和优越性，该策略可以自适应不同严重程度的故障扰动，并能及时有效地保证系统频率稳定以及各母线处的电压稳定。 |
| 关键词: 协调减载策略 频率稳定 电压稳定 自适应控制 |
| DOI：10.16081/j.issn.1006-6047.2017.12.022 |
| 分类号:TM761 |
| 基金项目:国家电网公司科技项目(多区域安控系统协调及在线诊断、辅助决策技术研发应用)；国家自然科学基金资助项目(51507116) |
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| Adaptive coordinated low frequency load shedding strategy considering voltage stability |
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LI Shun, LIAO Qingfen, LIU Dichen, TANG Fei
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School of Electrical Engineering, Wuhan University, Wuhan 430072, China
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| Abstract: |
| The power grid often operates in the state of critical stability in order to improve the utilization rate of resource, the large scale blackout often occurs when power system operates with heavy load and which is mostly manifested as system collapse caused by the combination of multiple electrical quantities. An adaptive coordinated low frequency load shedding strategy with the consideration of voltage stability is proposed. The severity of disturbance is classified by the dynamic calculation value of power deficiency for choosing different control strategies. Two stage load shedding is needed when serious fault occurs, the location and the allocation in stage 1 is obtained according to the frequency adjustment effect of each load bus, the active power loss sensitivity is adopted to obtain the information of voltage weak area, and load shedding in stage 2 is implemented after time delay. While load shedding in stage 2 is directly implemented when normal fault occurs. Simulation verifies the effectiveness and superiority of the proposed strategy which can be adaptive to fault disturbance with different severity and can effectively and timely ensure the system frequency stability and voltage stability of each bus. |
| Key words: coordinated load shedding strategy frequency stability voltage stability adaptive control |
