Abstract
The double‐fed induction wind generator‐ (DFIG‐) based wind generation system contains power electronic converters and filter capacitor and inductor, which will bring about high‐frequency harmonics under the influence of controllers. Aiming at this problem, this paper studies the relation between the output current and the harmonic source at grid‐side and rotor‐side converters based on their control features in the DFIG system. Furthermore, the harmonic equivalent models of these two converters are built, and the influence of different factors on harmonic features is explored from four perspectives, i.e., modulation method, altering controller parameters, altering output power, and the unbalance of three‐phase voltage. Finally, the effectiveness of the proposed model is verified through the 2 MW DFIG real‐time hardware‐in‐the‐loop test platform by StarSim software and real test data, respectively.
Highlights
New energy power generation technologies have become hot spots as the energy and environmental issues obtained prominent attention
Wind energy has been widely applied in power systems because of its clean, harmless, and abundant nature in natural resources. e double-fed wind power generation system has become the mainstream in wind power generation systems because of its small capacity in the eld converter, low cost, and variable-speed constantfrequency operation features [1,2,3,4,5,6]
In [12], the harmonic characteristics of the double-fed wind turbine converter are analyzed, and the e ect of the converter harmonic on the system overall output harmonic is analyzed by establishing the equivalent circuit of the asynchronous motor
Summary
New energy power generation technologies have become hot spots as the energy and environmental issues obtained prominent attention. It is pointed out that the harmonic modulation of the converter, the cogging harmonic of the motor itself, and the grid background harmonic a ect the stator output harmonics of the double-fed wind turbine. According to the characteristics of the asynchronous motor, literature [14] analyzes the interaction between the grid-side converter harmonic and the rotor-side converter harmonic in the double-fed wind power generation system. From the above literature studies, the grid-side or rotorside converters in the double-fed wind power generation system are viewed as a simple harmonic voltage source when modeling and analyzing the converter output harmonic characteristics, while the in uence of converter control. E harmonic output characteristics of the double-fed wind power generation system are studied by establishing the harmonic equivalent model Rational motor structure designing. us, this paper mainly considers the PW modulation harmonics of the converter and the background harmonics of the power grid. e harmonic output characteristics of the double-fed wind power generation system are studied by establishing the harmonic equivalent model
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