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The LCL-filter is one of the methods to reduce the size of the filter inductor but it leads to resonance in the system. The resonance usually results in unstable system and triggers the over-current protection. An active damping technique based on the virtual resistor is provided in this paper. The concept and the mathematical analysis of the proposed method are explained, and then the stability of...
STATCOMs provide grid with not only reactive power compensation but auxiliary stability support through exerting influence on the dynamic behavior of Synchronous Generator (SG) during grid power oscillations. In this paper, method of electrical torque analysis is utilized to analyze the mechanism of STATCOM affecting the transient performance of SG when operates in power oscillations suppression mode,...
This paper discussed the tuning process of the power system stabilizer (PSS) for a nuclear turbine-generator excitation system. By measuring the non-compensated phase-frequency characteristic of the excitation without PSS, and through calculation and critical gain test, the PSS parameters are determined. Through step response and anti-regulation experiment, the effectiveness of the PSS is verified.
The recently proposed concept virtual synchronous generator (VSG) has been intensively researched. Its core idea is to add a segment in traditional inverter control to simulate synchronous generator's rotor motion characteristic so that the distributed energy resources (DER) can have virtual inertia. VSG control usually contains output current amplitude limiting part to avoid too large current from...
A large amount of distributed generation is connected to the grid, reducing rotational inertia of the power system. Based on the Static Synchronous Generator Model, inertia controller is introduced on outer voltage loop in this paper to enhance grid inertia. The developed inertia controller can generate inertial current superposed in conventional current reference. The inertial current can be adjusted...
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