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The high penetration of renewable energy sources in electrical distribution networks is giving rise to new challenges in the low voltage network operation. Power electronics converters are widely used to connect these energy resources to the grid, and the control technique that emulates the operation of synchronous generators is attracting the attention of researchers in recent years. Such converters...
A control system model of a virtual power plant with reactive power supply is proposed for small signal stability analysis of voltage control in medium voltage distribution grids. The model is linearized at different operating points and the damping factor is assessed. Depending on the virtual power plant's control parameters, oscillating system reactions can be observed. A parameter variation is...
The margin trading has entered the pilot run phase since the March 31st, 2010 in China. Selecting the weighted stock as our sample, empirical select the SSE 50 Index as the research object, set suitable time dummy variables, test the impacts of the margin trading to the volatility of the A share stock market in the ups and downs of the stock market via EGARCH and VAR model. The empirical results shows...
The droop method has been widely used in the parallel operation of inverters. The coefficients of the droop controller influence the transient response and stability of the wireless paralleled inverters system. However, the conventional phasor representation of sinusoidal signals is constrained by the quasi-stationary assumption, which is generally acceptable for the steady-state or slow-acting analysis...
In this paper, the stability of a three phase two-level rectifier is studied. This type of power converter has two operation modes, as rectifier or as inverter. The dynamics of the rectifier consist of a set of equations highly nonlinear. Through the definitions of the instantaneous active and reactive powers, the model of the system is sometimes expressed in terms of power instead of current. Since...
A multi-index nonlinear coordinated control scheme for BESS and generator excitation is proposed. The proposed multi-index nonlinear coordinated controller can effectively coordinate the dynamic and steady-state performance of the controlled system. It can enhance the stability of the system, improve the dynamic characteristics of state variables, and can improve the control accuracy of output variables...
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
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