Abstract
Brushless doubly-fed induction generators have higher reliability, making them an attractive choice for not only offshore applications but also for remote locations. These generators are composed of two back-to-back voltage source converters, a grid side converter and a rotor side converter. Existing techniques use the rotor side converter for reactive current control; however, it is more suitable for stabilizing steady state behavior. In order to stabilize the voltage fluctuations at the point of common coupling (PCC) due to sudden inductive load introduction, the grid side converter may be a better choice due to faster response and higher control bandwidth. Therefore, this paper proposes a control scheme for the grid side converter to suppress the PCC voltage fluctuations when a large inductive load is suddenly connected. The proposed technique is based on an analytical model of the transient behavior of the voltage drop at the PCC. The analysis shows that reactive current control using the grid side converter introduces a double fundamental frequency component to the PCC voltage. To block this harmonic, we designed a notch filter. The simulation results in Matlab/Simulink show that the proposed technique can not only significantly reduce the voltage drop but also results in an 82% reduction in voltage distortion at the PCC.
Highlights
Renewable energy systems are penetrating mainstream power generation due to their environment friendliness and an increasing demand for energy around the world
This paper focuses on the problem of improving the transient behavior of a brushless doubly-fed induction generator by reducing the voltage drop when a large inductive load is suddenly connected to the point of common coupling (PCC)
This paper focuses on developing a grid side converter control scheme to reduce the voltage drop as well as voltage fluctuations at the point of common coupling
Summary
Renewable energy systems are penetrating mainstream power generation due to their environment friendliness and an increasing demand for energy around the world. This is especially true when a large inductive load is suddenly introduced to the PCC such as motors, transformers, and chokes To solve this issue, this paper focuses on the problem of improving the transient behavior of a brushless doubly-fed induction generator by reducing the voltage drop when a large inductive load is suddenly connected to the PCC. This paper proposes a GSC control scheme to quickly reduce the PCC voltage fluctuations by injecting reactive current. When an inductive load is instantaneously connected to the PCC, the conventional control scheme does not remain optimal as the transient part of the load current may be fluctuating instead of being constant To this point, the proposed work explores the transient and steady state components of the voltage drop at the PCC.
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