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ABSTRACT: Due to their unpredictable generation patterns, large-scale wind farms may affect the voltage stability of their integrated power systems negatively. This paper proposes a novel on-line collaborative voltage stability control method to eliminate the negative impact of large-scale wind farms integrated with a power system. The implementation of the proposed method is based on the on-line collaboration of existed local control devices installed in the power system to enhance their total control efficiency. The on-line control collaboration operates on the basis of a proposed protocol of information exchange for multi-agent systems. In the paper, an example of multi-machine power system is presented where a multi- agent system for the on-line collaborative voltage stability control of local devices, including AVRs, STATCOM and circuit breakers is set up. Effectiveness and feasibility of the proposed method to eliminate the threat to system voltage stability posed by the integrated large-scale wind farms is demonstrated.
Universities Power Engineering Conference, 2007. UPEC 2007. 42nd International; 10/2007
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ABSTRACT: STATCOM (static synchronous compensator) and SSSC (series static synchronous compensator) are two new generation of FACTS devices based on voltage source converter (VSC). In this paper, a novel analytical method based on the well-know equal-area criterion in studying their capability to improve power system oscillation stability is proposed and some useful analytical conclusions are presented. Simulation results of an example power system installed with a STATCOM-based stabilizer are given in part II of the paper to demonstrate the theory and analysis presented in the paper. Extension to more complicated case of multi-machine power systems is also discussed in part II.
Universities Power Engineering Conference, 2007. UPEC 2007. 42nd International; 10/2007
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ABSTRACT: This is the second part of the paper, presenting results of simulation tests of an example power system installed with a STATCOM-based stabilizer. Extension to more complicated case of multi-machine power systems is also discussed in this part.
Universities Power Engineering Conference, 2007. UPEC 2007. 42nd International; 10/2007
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ABSTRACT: This paper investigates the feasibility of damping multi-mode oscillations by a single FACTS device with multiple damping controllers in a multi-machine power system. The nonlinear dynamic model and the linearized Phillips- Heffron model of a power system installed with a MUPFC (Multi-terminal UPFC) are derived. While MUPFC is a type of FACTS device as an extended UPFC (Unified Power Flow Controller). Based on modal analysis, controllability indices are used to decide respective efficient control loops for weakly damped modes. Simulation result indicates that the multiple auxiliary damping controllers of a single FACTS determined by the proposed method can successfully suppress the multi-mode oscillations in the power system.
Universities Power Engineering Conference, 2007. UPEC 2007. 42nd International; 10/2007
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ABSTRACT: In this paper, on-line collaboration of a multi-agent system is applied for the coordination of power system voltage control to maintain system voltage stability when the system is subject to severe faults. Through real-time information exchange and synthesis among various control agents based on predefined communication protocol, on-line collective actions can be taken to prevent the power system from losing voltage stability. In order to ensure correct information exchange among agents, this paper proposes an error-tolerant communication protocol based on a second round of group broadcasting among agents. The error-tolerant protocol grantees the maximum likelihood of correct information exchange among agents when communication errors caused by such as the lost of a communication channel and corruption of transmitted information. In the paper, application example of proposed scheme in the IEEE standard 10-machine 39-node New England power system is presented. Simulation results are given to demonstrate the effectiveness of the proposed scheme to maintain system voltage stability.
04/2007;
