| 引用本文: | 杨 峰,徐习东,裘愉涛.交流电压不对称下柔性直流配网换流站功率传输极限研究[J].电力系统保护与控制,2016,44(20):86-93.[点击复制] |
| YANG Feng,XU Xidong,QIU Yutao.Research on transmission power limit of flexible DC distribution converters under unbalanced AC voltages[J].Power System Protection and Control,2016,44(20):86-93[点击复制] |
|
| |
|
|
| 本文已被：浏览 4716次 下载 2223次 |
码上扫一扫！ |
| 交流电压不对称下柔性直流配网换流站功率传输极限研究 |
| 杨峰,徐习东,裘愉涛 |
|
|
| (浙江大学, 浙江 杭州 310027;浙江省电力公司，浙江 杭州 310007) |
|
| 摘要: |
| 为了维持直流配网中直流电压的稳定，需要换流器在交流电压不对称时消除传输功率的二倍频波动。分析了交流电压不对称下换流器的不平衡控制策略。由于换流器过流能力限制，换流站的传输功率极限受不对称电压影响，推导了交流侧传输功率极限解析式。针对直流侧功率极限解析式难以求得的问题，提出了直流侧功率极限的数值计算方法。最后通过电磁暂态仿真软件PSCAD/EMTDC对交流电网不对称下换流器传输功率极限进行了验证。功率极限值的给定，为合理分配多端直流配电网各端的功率，维持直流电压稳定提供了参考。 |
| 关键词: 功率传输极限 交流电压不对称 柔性直流配网 电压源换流器 不平衡控制 |
| DOI：10.7667/PSPC20162014 |
| 投稿时间：2015-10-12修订日期：2015-12-07 |
| 基金项目:国家863高技术基金项目(2015AA050104) |
|
| Research on transmission power limit of flexible DC distribution converters under unbalanced AC voltages |
| YANG Feng,XU Xidong,QIU Yutao |
| (Zhejiang University, Hangzhou 310027, China;Zhejiang Electric Power Corporation, Hangzhou 310007, China) |
| Abstract: |
| To stabilize the DC voltage in a DC distribution network, it is necessary to suppress the double fundamental frequency fluctuation of the active power under unbalanced AC voltages. This paper analyzes unbalanced control strategies of voltage source converters (VSCs). Due to the overcurrent capability of converters, the transmission power limit of VSCs varies with various unbalanced AC voltage conditions. The transmission power limit of the AC side is deduced. Then a numerical method is put forward to calculate the transmission power limit of the DC side. Examples of power transmission under unbalanced AC voltages are simulated by electromagnetic transient simulation software PSCAD/EMTDC. The transmission power limits of VSCs of both the AC and DC sides are necessary for power distribution in multi-terminal DC distribution network. To suppress the fluctuation of the DC voltage, it is necessary to control the active power of VSCs within the transmission power limit of the DC side. This work is supported by National High-tech R & D Program of China (863 Program) (No. 2015AA050104). |
| Key words: transmission power limit unbalanced AC voltages flexible DC distribution voltage source converter (VSC) unbalanced control |
|
|
