The application of synchronous grid connection in power supply system

2010 5th International Conference on Critical Infrastructure (CRIS) Pub Date : 2010-11-01 DOI:10.1109/CRIS.2010.5617582

Shiwu Xiao, Kai Xu

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引用次数: 1

Abstract

When large power supply system becomes isolated after fault occurred, the best method is finding a suitable grid-connected point to connect with external power system to maintain stable. This paper presents different connection methods on different operation conditions based on one actual power supply system. If active power in isolated system is larger than load demand, cutting-generator is adopted; if less, low-frequency load shedding is adopted to keep system stable firstly, then synchronous connection conditions are checked to connect isolated system with external power system in steady state. This connection method is safe and reliable. When there are fewer generators in isolated supply system, stability can't be remained by load shedding, it is necessary to rapidly connect with external power grid in order to remain power supply stable, this time grid connection must be conducted in transient state. In this situation connection conditions are decided mainly by phase and frequency difference. This rapid connection method is analyzed and verified, and connection conditions are derived by calculation.

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同步并网在供电系统中的应用

当大型供电系统发生故障后被隔离时，最好的方法是找到一个合适的并网点与外部电力系统连接以保持稳定。本文以某一实际供电系统为例，介绍了不同运行条件下的接线方法。当隔离系统有功功率大于负荷需求时，采用切断式发电机;如果小于，则首先采用低频减载保持系统稳定，然后检查同步连接条件，将隔离系统与外部电力系统在稳态下连接。这种连接方式安全可靠。当孤立供电系统中发电机数量较少时，无法通过减载保持稳定，需要快速接入外部电网以保持供电稳定，此时必须在暂态状态下进行并网。在这种情况下，连接条件主要由相位差和频差决定。对该快速连接方法进行了分析和验证，并通过计算导出了连接条件。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2010 5th International Conference on Critical Infrastructure (CRIS)

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