1云南异步联网试验-南方电网技术.doc

文章编号：1674-0629(2012)01-0001-07 中图分类号：TMXXX 文献标志码：A DOI：10.13648/j.cnki.issn1674-0629.2014.0x.00x 云南异步联网方式下超低频振荡研究 (一)机理分析及仿真 刘春晓1，张俊峰2，陈亦平1，张建新1，徐敏3，王官宏4 （1. 中国南方电网电力调度控制中心，广东 广州510623； 2. 广东电网公司电力科学研究院，广东 广州510080；3. 南方电网科学研究院，广东 广州510080；4. 中国电力科学研究院，北京100192） 摘要：2016年南方电网实施异步联网运行方式，水力资源丰富、位于送端的云南电网通过7回直流与主网联络，频率稳定问题凸显。实际在进行预设的直流功率提升等试验项目过程中，发现云南主网频率长时间超低频率振荡，并伴随多个中枢厂站电压大幅波动告警，后在调度员下令退出部分云南主力水电厂一次调频功能后，系统频率恢复稳定。本文通过大量现场试验数据分析，并利用控制系统力矩分解及振荡能量计算，发现云南水电机组的调速系统普遍性的在本次振荡过程中提供了负阻尼，而火电机组的调速系统则均提供正阻尼，此外，水火电机组的励磁系统、直流控制系统也明显提供正阻尼，从而锁定了水电机组调速系统是造成本次振荡的直接原因。进一步的，本文对水电机组调速系统提供负阻尼的机理进行了分析，水电机组自身特性尤其是水锤效应造成了其在低频段的负阻尼特性。在此基础上，本文利用离线数据仿真成功复现了试验过程中的超低频振荡现象，验证了理论的正确性，并为下一步工作提供了初步建议。 关键词：异步联网；超低频振荡；调速系统；仿真 The Analysis and Simulation of Ultra-low Frequency Oscillation at Yunnan Asynchronous Networking LIU Chunxiao1, ZHANG Junfeng2, CHEN Yiping1, ZHANG Jianxin1, XU Min3, WANG Guanhong4 (1. China Southern Power Grid, Guangzhou, Guangdong 510623, China;Tsinghua University, Beijing 100084, China; 2. Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou, Guangdong 510080, China; 3. China Electric Power Research Institute, Beijing 100192, China) ,, Abstract: China Southern Power Grid starts to operate asynchronously in 2016. Yunnan Power Grid with abundant water resource, located in the supply side and connecting with the main grid by seven DCs, has a lot of problems in the frequency stability. During the practical experiment of raising the DC power as planned, Yunnan Grid was oscillating in ultra-low frequency for a long period, with warnings of oscillation in voltage from several central plants. After the primary frequency regulation function of some hydraulic power plants in Yunnan Grid was quitted by operators, the frequency of the power system restored to steady level. In this paper, through abundant analysis to the experiment data and calculation of oscillation energy by disintegrating the moment of control system, the direct reason of this oscillation