報告書番号

T86047

タイトル（和文）

系統間並列現象の解析－解析手法の開発と基本的現象の解明－

タイトル（英文）

DEVELOPMENT OF SIMMULATION METHOD TO ANALYSEPOWER SYSTEM REPARALLEING OF ISLANDED SYSTEMS

概要 （図表や脚注は「報告書全文」に掲載しております）

電力系統の復旧過程においては，分離系統の早期並列が重要である。 発電機を系統に同期並入する場合には並入時のトルクや発電機電流の大きさによって制限を受けているが，分離系統を本系統に並列する場合には安定度や発電プラントの安定運用も大きな考慮要因となってくる。 これらの考慮要因と並列時の条件（位相差，周波数差，電圧差）の間の関係を明らかとするために，多機系統の並列現象を解析できる系統間並列現象解析手法を開発し，その一部の機能を検証するために単純系統での瞬時値解析手法も開発した。また，これらによるシミュレーション解析とともに，並列現象の理論的解明を行い，並列現象を明らかとし，また，開発したこれらの手法の適用範囲を明らかとした。

概要 （英文）

The islanded system separated by a major disturbance such as route (2 circuits) faults of EHV line will be operated stably as the emergency control system automatically sheds proper generation or load. But the islanded system should be reparalleled to the main system as soon as possible to restore the shed generation or load. At present, because the reparalleling process is done manually, it is not sure that it is completed in a short time. In future, it is also expected that rapid reparalleling will become more difficult because of more introduction of unmanned substations at the reparalleling points. In order to settle these problems it is essential that the phenomena and restrictions of reparalleling process should be made clear and the control considered these restrictions should be adopted. This paper presents the developed two simulation programs of system reparalleling to analyse the following two major restriction. In case of single generator synchronization, the main restriction are the magnitude of the generator torque and armature current. Therefore the first developed program can analyse the alternating torque and current. But in case of reparalleling of islanded systems, one of the main restriction is whether the all generators are synchronized without pole slip, namely the problem is the whole system stability. Another restriction is whether the power plants in the system are operated stably after reparalleling under the condition of frequency difference between systems at the time. To analyse these two restriction, the second simulation program has been developed by improving the power system dynamics analysis program developed by CRIEPI which is commonly used in Japanese utilities. These two developed programs are verified each other and theoretical study has been done and has cleared the causes of restriction and the extent of the application of these programs.

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