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The virtual synchronous generator (VSG) inverter implemented based on real-time workshop (RTW) is proposed. The design cycle of VSG implemented based on RTW is shown. Consulting the traditional mathematical model of synchronous generator in power system, the virtual synchronous generator model is built in MATLAB/Simulink, and realizing the model conversion to the code automatic. Then the Micro-source...
Studying of the IEC flicker meter shows that the instantaneous flicker sensation level S can be calculated directly if the spectrums of fluctuating component of voltage are known. In this paper a novel flicker measurement method is proposed. First, the square demodulation is used to obtain the fluctuating component of voltage, and then the chirp-z transform (CZT) is used to get the amplitude and the...
A direct type multilevel current source inverter (CSI) and its closed-loop strategy are studied in this paper. In the three phase static symmetric axes (a, b, c), parameters on the AC side of the three phase five-level CSI are time-variant AC variables, which is a difficult point in the designing of control system. So a direct current control method based on the synchronous rotational axes (d, q,...
This paper presents a closed dual-loop controller based on pole-assignment for single-phase high-frequency (HF) link inverter. It is not difficult for the controller to design the controlled parameters using the method. The controller consists of the inner current loop and the outer voltage loop. To improve overall performance of the system, it is adopted that the control method combined the instantaneous...
Aiming at boost chopper type slip energy recovery system's indeterminate model and strong nonlinear character, also the disadvantage of the traditional control scheme, passivity-based control scheme is applied to solve these problems. The equivalent circuits is firstly established and then the Euler-Lagrange model. The passivity-based control scheme is deduced by using this Ruler-Lagrange model. Matlab/Simulink...
The power fluctuation (DeltaPe) between generator and electric power system is the main measurable disturbance for destroying generator stability. In order to improve the ability of generator for restraining disturbance, a governor additional decentralized control (HGADC) used on hydro-turbine generator is proposed in the paper based on Hinfin robust control theory. When the DeltaPe is used as a...
The locomotive battery requests its testing system special requirements of excellent DC charge/discharge current which is sensitive to the fluctuation of the voltage. It also needs a fast transfer speed between charge and discharge state. Simple converters without appropriate filter can't meet the requirement mentioned above. The decay of the Chebyshev filter increases fast with frequency in the stop-band...
The locomotive battery requests its testing system special requirements of excellent DC charge/discharge current which is sensitive to the fluctuation of the voltage. It also needs a fast transfer speed between charge and discharge state. Simple converters without appropriate filter can't meet the requirement mentioned above. The decay of the Chebyshev filter increases fast with frequency in the stop-band...
Along with the development of battery, the maintenance of battery becomes more and more important, performance measurement and capacity measurement of battery are needed. Moreover, the refreshment of the charge technique should not only feet the charge/discharge requirement of new battery, but also improve the quality of charge/discharge of battery, prolong the operation life span. The text discusses...
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