Abstract
With the rapid increase of embedded inverter-based distributed generators (IBDGs), the active distributed network (ADN) is facing security and protection challenges because IBDGs will contribute extra fault current. In contrary to the existing method that IBDGs provide varying degrees of positive contribution to system fault current, in this article, a fault current negative contribution (FCNC) method is proposed for IBDGs to reduce the system fault current lower than the situation where without IBDGs embedded. In the proposed method, a maximum current phase angle adjustment (MCPAA) strategy is conducted for IBDGs to maximize its negative contribution, thus to minimize the system fault current. In order to obtain a more precise current phase angle, a voltage phase angle determination (VPAD) strategy is also formulated by considering the voltage angle difference on the electrical distance between IBDGs and fault bus. Extensive tests and relevant results have validated the feasibility of FCNC method to achieve a negative contribution of IBDGs on system fault current.
Highlights
Driven by the energy shortage, environmental pollution, and economic issues, the renewable energies, such as solar and wind power, combined with the electrochemical energy storage systems, such as batteries, are widely integrated into the active distribution network (ADN) in the form of inverter-based distributed generators (IBDGs) [1]-[2]
Strategy is conducted for IBDGs to maximize its negative contribution, to minimize the system fault current; 2) A voltage phase angle determination (VPAD) strategy is formulated by considering the voltage angle difference on the electrical distance between IBDGs and fault bus, to obtain a more accurate value of current phase angle
The maximum current phase angle adjustment (MCPAA) strategy is conducted for IBDGs to maximize its negative contribution, to minimize the system fault current
Summary
Driven by the energy shortage, environmental pollution, and economic issues, the renewable energies, such as solar and wind power, combined with the electrochemical energy storage systems, such as batteries, are widely integrated into the active distribution network (ADN) in the form of IBDGs [1]-[2]. It is imperative to find a method to make IBDGs provide negative contribution of fault current on system It will be benefit for utility grid due to the reduced harmful of fault current. The motivation is how to reduce the system fault current of ADNs by the control of IBDGs, making the total fault current lower than it’s in situation when without IBDGs embedded. To solve this challenge, a fault current negative contribution (FCNC) method is proposed for IBDGs. The major contributions are summarized as: 1) A maximum current phase angle adjustment (MCPAA).
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