黎上强;乔颖;徐曼;吴林林;鲁宗相;鲜文渊;

• 1:电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系)
• 2:国网冀北电力有限公司电力科学研究院(华北电力科学研究院有限责任公司)

摘要(Abstract)：

新能源大规模接入和直流电网是未来电网的2个热点。新能源发电交流汇集后接入定电压/频率模式下的电压源型(voltage sourced converter,VSC)换流站,构成新能源孤岛柔直汇集送出系统。相较于纯交流送出模式,该系统的电压支撑由VSC换流站控制策略实现并与新能源交流汇集网络的无功电压控制相协调,可控性更高、适应性更好。然而,新能源的强随机波动性使换流站的安全裕度随工况而急剧变化,其优化控制成为影响系统安全的关键难题。提出"站–网"协调的多目标换流站安全裕度优化方法,以公共耦合点(point of common coupling,PCC)的电压作为层间交换变量,上层进行换流站无功电压安全裕度优化以确定PCC电压值,下层依据PCC电压值进行新能源汇集网络的经济优化,实现了多工况下考虑网损、无功电压安全等多重目标的安全裕度优化控制。最后基于某柔直电网新能源输送系统的仿真,验证了所提策略能够在各种工况下保证平稳的高安全裕度。

关键词(KeyWords)： 新能源孤岛柔直汇集送出系统;VSC换流站;动态无功裕度;电压安全裕度;分层多目标优化

Abstract:

Keywords:

基金项目(Foundation): 国家电网有限公司科技项目(SGJBDK00ZDJS1800022)~~

作者(Author): 黎上强;乔颖;徐曼;吴林林;鲁宗相;鲜文渊;

Email:

DOI: 10.13335/j.1000-3673.pst.2020.0047a

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