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Virtual synchronous generator (VSG) control is a promising communication-less control method in a microgrid for its inertia support feature. However, active power oscillation and improper transient active power sharing are observed when basic VSG control is applied. Moreover, the problem of reactive power sharing error, inherited from conventional droop control, should also be addressed to obtain...
This paper proposes a novel reactive power control strategy based on virtual flux droop method. Firstly, flux droop control method is derived, where comlicated multiple feedback loops and parameter regulation are avoided. Next, the factors influencing reactive power sharing are theoretically analysed in virtual flux control. Then, a novel reactive power droop controller is designed which consists...
This paper proposes an enhanced distributed generation (DG) unit with an adaptive virtual impedance control approach in order to solve the inaccurate reactive power sharing problem. The proposed method can adaptively regulate DG units with the aid of the equivalent impedance, and the mismatching problem of the feeder impedance is compensated by sharing the reactive power accurately. The proposed control...
In the context of microgrids, most of the research has concentrated on developing new control strategies for integration of DG sources into the power grid and seamless transition techniques between grid-connected and islanded modes. However, a few research work has focused on the power control at the point of common coupling (PCC) between utility grid and microgrid. This paper presents alternative...
In this paper voltage source converters (VSCs) are being used in grid integrated power converters. For the mathematical model of PWM inverter under the d-q rotary coordinate system. This work has proposed a Microgrid power flow control under variable load and generation conditions. There exists coupling between the active current and reactive current, which makes it difficult to manipulate the power...
A microgrid (MG) as a main component of the smart grid integrates Distributed Generation System (DGS) to supply power of local loads. In other words, MG is a unit of integration of the DGs and loads which can operate either connected to or isolated from the main grid. Coordinated control of DGs in MGs is one of the technical difficulties. In this paper, a typical MG consisting of three DGs which are...
As one of the forefront topics in the study of electrical engineering, microgrid can provides a new technical method for large scale application of new energy and renewable energy intergration. Microgrid can not provide flexible operation modes and high quality power supply services without thorough and stable control system, and the independent active and reactive power control is a important question...
The emergence of large amounts of distributed energy resources (DER) poses new challenges for the active participation of those units in the control of the grid. In this context, a recent development is the microgrid, which presents a coordinated approach for integrating the DER in the electrical grid. Microgrids are able to operate either connected to the distribution grid or in islanded mode. In...
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