Abstract
To increase the utilization of wind power in the power system, grid integration standards have been proposed for the stable integration of large-scale wind power plants. In particular, fault-ride-through capability, especially Low-Voltage-Ride-Through (LVRT), has been emphasized, as it is related to tripping in wind farms. Therefore, this paper proposes the Wind power plant applicable-Effective Reactive power Reserve (Wa-ERPR), which combines both wind power plants and conventional generators at the Point of Interconnection (POI). The reactive power capability of the doubly-fed induction generator wind farm was considered to compute the total Wa-ERPR at the POI with reactive power capability of existing generators. By using the Wa-ERPR management algorithm, in case of a violation of the LVRT standards, the amount of reactive power compensation is computed using the Wa-ERPR management scheme. The proposed scheme calculates the Wa-ERPR and computes the required reactive power, reflecting the change of the system topology pre- and post-contingency, to satisfy the LVRT criterion when LVRT regulation is not satisfied at the POI. The static synchronous compensator (STATCOM) with the capacity corresponding to calculated amount of reactive power through the Wa-ERPR management scheme is applied to the POI. Therefore, it is confirmed that the wind power plant satisfies the LVRT criteria by securing the appropriate reactive power at the POI, by applying of the proposed algorithm.
Highlights
Interest in renewable energy has been gradually increasing because of the depletion of fossil fuels, and the limitations placed on greenhouse gas emissions
In the case of a WPP, the total amount of PQ capability of the Wind Turbines (WTs) is determined according to number of WTs, and the RPR is calculated by computing the difference between the operation point and Qmax
If an LVRT criterion is not met after a line contingency, a stable amount of Wind power plant applicable-Effective Reactive power Reserve (Wa-ERPR) needs to be secured by calculating reactive power compensation, which can affect the Point of Interconnection (POI), through a comparison with the pre-contingency
Summary
Interest in renewable energy has been gradually increasing because of the depletion of fossil fuels, and the limitations placed on greenhouse gas emissions. 53 GW of new renewable capacity by 2030 Of this 53 GW, wind and photovoltaic power generation will account for approximately 80%. As the utilization of new and renewable energy is being accelerated by the support of governmental policies and the construction of large-scale renewable energy plants, the stability of the power grid including the existing synchronous generators becomes an important issue; the technical requirements for a wind power farm become stricter. As the impact on the stability of the power system increases due to the connection of large quantities of renewable power, the technical requirements for wind power plants have been made stricter [1]. The grid code states that a large-scale wind farm should have to a gridability, via a converter. Low-Voltage-Ride-Through criterion that operational of wind wind turbine connection. Connected to a grid short-term transient when certain eventsthat occur in the grid. should
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