TITLE:
Research on the Influence Factors and Coordinated Control Strategies between Unit and Grid for Isolated Power System
AUTHORS:
Ge Jin, Xiaomei Chen, Yongxin Feng, Shaoxiang Deng, Hanting Yan, Zexiang Cai
KEYWORDS:
Isolated Power System; Coordinated Control Strategies; Under Frequency Load Shedding; Dynamic Frequency Characteristics; Speed Governor Parameter Settings
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
October
22,
2013
ABSTRACT: As the existing coordinated control
strategies between grid and unit have limitations in isolated power system,
this paper introduces new coordinated control strategies which can improve the
stability of isolated system operation. This paper analyzes the power grid side
and unit side influence factors on the isolated power system. The dynamic models
which are suitable for islanding operation are applied to simulate and analyze
the stability and dynamic characteristics of the isolated power system under
the conditions of different load disturbances and governor parameters. With considering the differences of frequency characteristics
between the interconnected and isolated power system, the adjusting and
optimization methods of under frequency load shedding are proposed to meet the
frequency stability requirements simultaneously in the two cases. Not only
proper control strategies of the power plant but the settings of their parameters
are suggested to improve the operation stability of the isolated power system.
To confirm the correctness and effectiveness of the method mentioned above, the
isolated system operation test was conducted under the real power system
condition, and the results show that the proposed coordinated control
strategies can greatly improve stability of the isolated power system.