Abstract
Wind turbines with direct-driven permanent magnet synchronous generators (PMSGs) are widely used in wind power generation. According to the dynamic characteristics of PMSGs, an impact analysis of PMSG-based wind power penetration on the transient stability of multi-machine power systems is carried out in this paper based on the theory of extended equal area criterion (EEAC). Considering the most severe PMSG integration situation, the changes in the system’s equivalent power-angle relationships after integrating PMSGs are studied in detail. The system’s equivalent mechanical input power and the fault period electrical output power curves are found to be mainly affected. The analysis demonstrates that the integration of PMSGs can cause either detrimental or beneficial effects on the system transient stability. It is determined by several factors, including the selection of the synchronous generators used to balance wind power, the reactive power control mode of PMSGs and the wind power penetration level. Two different simulation systems are also adopted to verify the analysis results.
Highlights
Wind energy has developed quickly in recent years
The rest of this paper is organized as follows: Section 2 introduces a simplified model of permanent magnet synchronous generators (PMSGs) for transient stability studies and discusses the transient behaviors of PMSGs under different control modes; Section 3 presents the basic theory of equal area criterion (EEAC); Section 4 makes the influence analysis of integrating PMSGs on the system transient stability in detail by using EEAC theory; Section 5 verifies the influence rules of PMSGs, which are obtained in Section 4, by the dynamic simulations in Western Systems Coordinating Council (WSCC) 3-machine-9-bus system and Institute of Electrical and Electronics Engineers (IEEE) 10-mahicne-39-bus system; and Section 6 summarizes conclusions
This paper analyzed the impact of integrating PMSGs on the transient stability of multi-machine power systems based on the theory of EEAC
Summary
Wind energy has developed quickly in recent years. The total capacity of the globally installed wind turbine generators at the end of 2014 was 369.6 GW, representing a cumulative market growth of more than 16% compared with 2013 [1]. Several scenarios of system operation with PMSGs are studied, considering the most severe situation of PMSG integration, different synchronous generators used to balance wind power, and different reactive power control modes of PMSGs. The rest of this paper is organized as follows: Section 2 introduces a simplified model of PMSGs for transient stability studies and discusses the transient behaviors of PMSGs under different control modes; Section 3 presents the basic theory of EEAC; Section 4 makes the influence analysis of integrating PMSGs on the system transient stability in detail by using EEAC theory; Section 5 verifies the influence rules of PMSGs, which are obtained, by the dynamic simulations in Western Systems Coordinating Council (WSCC) 3-machine-9-bus system and Institute of Electrical and Electronics Engineers (IEEE) 10-mahicne-39-bus system; and Section 6 summarizes conclusions
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