| 引用本文: | 李世春,田冰杰,李惠子,等.基于频率安全约束与临界惯量计算的分时段限制风电出力方法[J].电力系统保护与控制,2022,50(15):60-71.[点击复制] |
| LI Shichun,TIAN Bingjie,LI Huizi,et al.Method for limiting wind power output in time periods based on frequency safetyconstraints and a critical inertia calculation[J].Power System Protection and Control,2022,50(15):60-71[点击复制] |
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| 摘要: |
| 高比例风电接入导致系统等效惯量降低，增加了电网引发频率失稳的可能性。为保障日内频率安全稳定运行，同时避免大面积切除风电的不合理操作，提出了基于频率安全约束与临界惯量计算的分时段限制风电出力方法。通过引入频率最低点和最大频率变化率约束指标，并考虑日内运行方式变化，分时段求解电网临界惯量及对应的最大风电并网容量。结合电网实际惯量判定小于临界惯量的时段，对这些时段依据最大风电并网容量确定风电切除量，从而在日内各时段消除频率安全隐患。最后通过算例系统证明：所提方法能准确筛查电网日内存在频率安全风险的时段，求解的风功率分时段切除量可有效消除频率安全隐患。 |
| 关键词: 高比例风电 频率安全约束 临界惯量 最大风电并网容量 风电切除量 |
| DOI：DOI: 10.19783/j.cnki.pspc.211322 |
| 投稿时间：2021-09-29修订日期：2021-12-23 |
| 基金项目:国家自然科学基金项目资助(51907104) |
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| Method for limiting wind power output in time periods based on frequency safetyconstraints and a critical inertia calculation |
| LI Shichun,TIAN Bingjie,LI Huizi,LUO Ying,HUANG Senyan,XU Songlin |
| (College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China) |
| Abstract: |
| The high proportion of wind power access to power systems leads to a reduction of the equivalent inertia of the system. This increases the possibility of frequency instability caused by the power grid. In order to ensure the safe and stable operation of the frequency during the day, and at the same time avoid the unreasonable step of removing wind power in a large area, a method of limiting wind power output based on frequency safety constraints and a critical inertia calculation is proposed. By introducing a frequency nadir and maximum rate of change of frequency constraint index, and considering the changes in the operation mode within the day, the critical inertia of the grid and the corresponding maximum wind power grid-connected capacity are calculated in time periods. A time period less than the critical inertia is determined based on the actual inertia of the grid, to determine the amount of wind power removal based on the maximum wind power grid-connected capacity. This is to eliminate hidden frequency safety hazards at various times of the day. Finally, a calculation example proves that the method proposed in this paper can accurately screen the time period of frequency safety risk in the grid day, and the calculated amount of wind power cut in time can effectively eliminate the hidden frequency safety hazard.
This work is supported by the National Natural Science Foundation of China (No. 51907104). |
| Key words: high proportion of wind power frequency safety constraints critical inertia maximum wind power grid-connected capacity wind power removal |
