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With the increase of the load and the growth of length of the line, it is not available to get the voltage rating by the conventional droop control. As a result, an improved control strategy based on dynamic virtual resistance is proposed in low-voltage DC microgrids. The designed dynamic virtual resistance is changed with the load current and the drop of voltage amplitude. The value of virtual resistance...
As a significant part of electrical load, air conditioners draw attentions for their sometimes-unfriendly load characteristics, especially their dynamic responses during grid voltage disturbances. In this paper, a novel under-voltage control strategy for variable-speed air conditioners is introduced, which can keep air conditioners load characteristic as constant impedances when unexpected voltage...
This paper presents a utilization technique for enhancing the capabilities of dynamic voltage restorers (DVRs). This paper aims to enhance the abilities of DVRs to maintain acceptable voltages and last longer during compensation. Both the magnitude and phase displacement angle of the synthesized DVR voltage are precisely adjusted to achieve lower power utilization. The real and reactive powers are...
This paper presents an active damping control strategy especially designed to mitigate the effects of the resonances of low damped power electronic based DC distribution systems. In those systems, some controlled converters are connected to a common DC bus usually exhibiting negative impedance due to its operation as constant power loads. The active damping control strategy is supported by a model...
Proportional and Integral (PI) controllers are often used to control the operation of the Distribution Static Compensator (DSTATCOM) for the distribution power system. However, since the power system is highly nonlinear and subject to various disturbances, the PI controlled DSTATCOM cannot provide optimal performance for different operating points. More robust controllers such as the ones based on...
This paper presents a modified technique for the tuning of power system controller parameters in order to improve the power quality and dynamic stability of the system. The technique uses symbolic Eigen value sensitivity analysis and linear programming approach to determine the optimum value of controller parameters in the system. The main objective function aims to shift critical Eigen values to...
In recent years, there has been a worldwide growth in the exploitation of wind farms. Because of increasing wind generation, growing non-liner loads and competitive electricity markets the operation mechanism of power systems are facing some problems such as transient stability, voltage regulation, damping of power oscillation, power flow control, etc. Among shunt FACTS devices STATCOM has been recognized...
This paper presents a robust control scheme for a static synchronous compensator (STATCOM) coupled with a battery energy storage system (BESS) for improving the dynamic oscillations damping and the transmission power quality in electric power systems. The presented STATCOM/BESS controls both reactive and active power injection/absorption to/from the power system. It is investigated the performance...
Control is a key issue for the performance and compensation characteristic of dynamic voltage restorer (DVR). After detailed analysis of the conventional phase shift control for DVR, this paper discovered a potential fatal problem of this control. Then, an advanced control method is proposed from the viewpoint of active power balance. After the theoretical analysis and digital implementation, further...
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