Abstract
Hardware protection and control action are two kinds of low voltage ride-through technical proposals widely used in a permanent magnet synchronous generator (PMSG). This paper proposes an innovative clustering concept for the equivalent modeling of a PMSG-based wind power plant (WPP), in which the impacts of both the chopper protection and the coordinated control of active and reactive powers are taken into account. First, the post-fault DC link voltage is selected as a concentrated expression of unit parameters, incoming wind and electrical distance to a fault point to reflect the transient characteristics of PMSGs. Next, we provide an effective method for calculating the post-fault DC link voltage based on the pre-fault wind energy and the terminal voltage dip. Third, PMSGs are divided into groups by analyzing the calculated DC link voltages without any clustering algorithm. Finally, PMSGs of the same group are equivalent as one rescaled PMSG to realize the transient equivalent modeling of the PMSG-based WPP. Using the DIgSILENT PowerFactory simulation platform, the efficiency and accuracy of the proposed equivalent model are tested against the traditional equivalent WPP and the detailed WPP. The simulation results show the proposed equivalent model can be used to analyze the offline electromechanical transients in power systems.
Highlights
To investigate the effects of ongoing changes in power systems with the increasing penetration of wind power, an accurate and reasonable wind power plant (WPP) model is essential
Each permanent magnet synchronous generator (PMSG) is connected to the collector system through a 0.69/35 kV grounding transformer, and the output is delivered to the 35/220 kV main transformer via 50 km transmission lines
In this paper, we proposed an innovative clustering concept for the equivalent modeling of PMSG-based WPPs, which takes into account the impacts of both the DC link chopper protection and the coordinated control of active and reactive powers
Summary
To investigate the effects of ongoing changes in power systems with the increasing penetration of wind power, an accurate and reasonable WPP model is essential. The actual WPP is modeled as a unique re-scale wind turbine. In order to improve the conformity of the single-machine representation with the actual WPP, numerical identification methods are applied to optimize the parameters of equivalent models. PMSG A PMSG is connected to the grid through a full scale power converter, with which the LVRT capability can be achieved. As for the unbalanced active power delivered by the generator to the DC link, the method for improving control strategies on the MSC, wherein the rotor of the wind turbine is used to store the energy, is feasible, but the response rate of the method is relatively slow owing to the high inertia of the wind turbine. In order to offer the network support, the control pattern of the grid side converter (GSC) is usually modified to preferentially support reactive power during this fault
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