电网发展的终极目标与恒电压运行的实现途径

doi:10.3969/j.issn.1000-7229.2015.10.005

摘要/Abstract

摘要：

提出恒电压运行的概念并论证恒电压运行是电网发展的终极目标。从恒电压运行的效益、恒电压运行的实现手段和恒电压运行的成本估计3个方面展开论述。恒电压运行的效益包括4个方面，分别为恒电压运行是坚强智能电网的终极表现形式；恒电压运行能够最大程度地抵御故障扰动并提高系统稳定性；恒电压运行可彻底解决大规模可再生能源接入电网引起的电压波动问题；恒电压运行可实现网损最小化。恒电压运行的实现手段主要是采用基于模块化多电平换流器技术的静止同步补偿器（modular multilevel converter based STATCOM，MMC-STATCOM），目前技术水平下单个MMC-STATCOM的合理容量为500 MVA。对一个具有2万km、500 kV输电线路的受端骨干网架进行了恒电压运行成本估计，表明所需要安装的MMC-STATCOM容量在3 000万 kVA以下，其投资成本在100亿人民币以内。

关键词: 电网规划, 恒电压运行, 受端系统, 无功平衡, 多直流馈入, 可再生能源接入电网, 电压波动, 模块化多电平换流器（MMC）, 静止同步补偿器

Abstract:

The concept of constant voltage operation was proposed, and it was demonstrated as the ultimate goal of power grid development. The topic was expanded from three aspects, including constant voltage operations benefit, realization way, and cost. The benefit of constant voltage operation includes four facets: constant voltage operation is the ultimate presentation of the strong smart grid；constant voltage operation can resist fault disturbance in the most powerful manner and improve the stability of power system greatly；constant voltage operation can completely eliminate the voltage fluctuation problem caused by the integration of large-scale renewable energy；constant voltage operation can minimize the grid loss. The realization way of constant voltage operation is mainly the static synchronous compensator based on modular multilevel converter （MMC-STATCOM）, whose appropriate single unit capacity at present technology level is about 500 MVA. The cost of constant voltage operation was estimated on a typical receiving system of 20 000 km 500 kV transmission line. The result shows that the capacity of the needed MMC-STATCOM is less than 30 GVA and the investment cost is less than 10 billion Yuan.

Key words: power grid planning, constant voltage operation, receiving system, reactive power balance, DC multi-infeed, renewable energy integration, voltage fluctuation, modular multilevel converter（MMC）, static synchronous compensator

中图分类号:

TM 712

徐政. 电网发展的终极目标与恒电压运行的实现途径[J]. 电力建设, 2015, 36(10): 34-39.

XU Zheng. Ultimate Goal of Power Grid Development and Realization Way of Constant Voltage Operation[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(10): 34-39.

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