| 引用本文: | 吴 萍,徐式蕴,赵 兵,陈 昊.面向风火打捆的特高压直流输电工程弱送端强直弱交耦合特性研究[J].电力自动化设备,2016,36(1): |
| WU Ping,XU Shiyun,ZHAO Bing,CHEN Hao.Research of weak sending-end coupling characteristics for bundled wind-thermal power transmission of UHVDC project[J].Electric Power Automation Equipment,2016,36(1): |
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| 摘要: |
| 哈郑特高压直流是我国首个大容量风火打捆直流外送工程，送端电网存在多种安全稳定问题。分析了直流运行特性，提出了过渡期联网运行和孤岛运行的条件。研究了弱送端电网不平衡功率分配特性，为故障后保障重要交流通道安全稳定控制策略的制定奠定了基础。研究了特高压直流输电系统与750 kV交流电网耦合特性，指出配套火电的投运将使吐哈断面稳定问题由动态稳定转变为暂态稳定，二通道同时存在电压大幅波动和暂态稳定问题，给出了故障约束下特高压直流与二通道输电能力。分析了直流对青藏直流及藏中电网频率稳定的影响规律，研究了风火不同比例下直流故障引起的电压波动问题，为西北电网的运行控制提供了参考依据。 |
| 关键词: 风火电打捆 稳定性 特高压输电 直流输电 风电比例 强直弱交 |
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| Research of weak sending-end coupling characteristics for bundled wind-thermal power transmission of UHVDC project |
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WU Ping, XU Shiyun, ZHAO Bing, CHEN Hao
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China Electric Power Research Institute，Beijing 100192，China
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| Abstract: |
| There are various safety and stability problems in the sending-end network of Hami-Zhengzhou UHVDC system of the first large-scale bundled wind-thermal power transmission project in China. The operating characteristics of HVDC are analyzed and the operational conditions of both grid-connecting and islanding modes in the transition period are proposed. The imbalanced power distribution in weak sending-end network is studied for the establishment of control strategy，which ensures the post-fault safety and stability of important lines. The coupling characteristics between UHVDC and 750 kV AC grid is studied，which shows that the successive putting into operation of auxiliary thermal units will change the stability problem of Tulufan-Hami section from dynamic stability to transient stability and there is large voltage fluctuation and transient stability problem in both channels，and the power transmission capacities of UHVDC and two channels are given. The effect of Hami-Zhengzhou UHVDC on the frequency stability of Qinghai-Tibet DC and Tibet Power Grid is researched and the voltage fluctuation induced by DC faults is studied for different wind-thermal power ratios，which provides reference to the operation and control of Northwest China Grid. |
| Key words: bundled wind-thermal power stability UHV power transmission DC power transmission wind power proportion rigid DC and weak AC |
