| 引用本文: | 李志坚,吴崇昊,万洛飞,等.大型同步调相机的启机过程分析与启机保护实现[J].电力系统保护与控制,2020,48(20):148-154.[点击复制] |
| LI Zhijian, WU Chonghao, WAN Luofei,et al.Analysis of start-up process and implementation of start-up protection of a large synchronous condenser[J].Power System Protection and Control,2020,48(20):148-154[点击复制] |
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| 摘要: |
| 近年来，随着电网“强直弱交”的问题日渐突出，同步调相机重新受到关注。300 Mvar大型同步调相机已陆续在国内多个换流站投入应用。因调相机启机方式存在特殊性，汽轮或水轮发电机组、抽水蓄能机组启机保护不完全适用于调相机，有必要对调相机启机过程及其保护配置和算法进行研究。针对不同类型的机组采用对比方式，分析了调相机的启机过程及其启机各阶段的三相短路电流特征。提出了更可靠、更快速的包含主变启机速断保护和励磁变启机差动保护在内的启机过程全区域保护。同时也提出了适用于调相机启机过程宽频率、宽电压变化的相角和幅值的修正方法。仿真结果表明，幅值计算误差改善明显，满足保护精度要求。 |
| 关键词: 同步调相机 无功补偿 静止变频器 启机过程 启机保护 |
| DOI：DOI: 10.19783/j.cnki.pspc.191490 |
| 投稿时间：2019-11-29修订日期：2020-03-06 |
| 基金项目:国家自然科学基金项目资助(U1866603) |
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| Analysis of start-up process and implementation of start-up protection of a large synchronous condenser |
| LI Zhijian,WU Chonghao,WAN Luofei,PAN Shuyan,WANG Huazhen,LI Wei |
| (1. NARI Technology Co., Ltd., Nanjing 211106, China;
2. NARI Group Corporation (State Grid Electric Power Research Institution), Nanjing 211106, China;
3. State Key Laboratory of Smart Grid Protection and Control, Nanjing 211106, China) |
| Abstract: |
| Recently, more attention has been paid to the large synchronous condenser as the problem of “strong DC and weak AC” is becoming increasingly serious. The 300 Mvar large synchronous condenser has been put into service in many converter stations in China. Because of the particularity of the start-up mode of a synchronous condenser, the start-up protection of the turbo-generator, hydro-generator and pumped-storage-generator is not fully applicable to the synchronous condenser. It is necessary to study the start-up process and protection configuration and algorithms of the synchronous condenser. Its start-up stage and characteristics of three-phase fault current are analyzed in the start-up process by comparing different types of generator units. A more reliable and faster start-up protection is proposed, including main transformer start-up quick-break protection and excitation transformer start-up differential protection. A method of phase angle and amplitude correction is presented. This is also suitable for wide frequency and wide voltage. The simulation results show that the error of amplitude calculation is clearly improved and meets the requirement of protection accuracy.
This work is supported by National Natural Science Foundation of China (No. U1866603). |
| Key words: synchronous condenser reactive power compensation SFC start-up process start-up protection |
