Abstract
The thought of the virtual synchronous generator (VSG) for controlling the grid-connected inverters and providing virtual inertia to the microgrid is emerging as a wide extension of the droop control, power coupling that always exists in the low-voltage microgrid, which may deteriorate the dynamic response and the stability of the system. In this paper, the principle of VSG control is introduced first. As an important issue of VSG control, the mechanism of the power coupling in the low-voltage microgrid is analyzed and the small-signal equivalent model of the power transmission loop is established. Subsequently, a power decoupling method based on the diagonal compensating matrix for VSG is proposed, which can realize the power decoupling with no impact on the original control channel. Meanwhile, the feasibility analysis of the decoupling method and the improved approach for reactive power sharing are also discussed. Simulation results verify the effectiveness of the decoupling strategy for VSGs.
Highlights
A microgrid is an organic system composed of loads, distributed generations (DGs), and energy storage devices
This paper proposes a power decoupling method, which directly compensates for the coupling component of the power loop
In the low-voltage resistance the active can be regulated by adjustingmicrogrid, the phase there angleisδ large and the reactive power can be regulated by adjusting the amplitude of the inverter output voltage, which is the basis of the droop characteristics of virtual synchronous generator (VSG)
Summary
A microgrid is an organic system composed of loads, distributed generations (DGs), and energy storage devices. Low-voltage microgrid lines present resistive or resistance-inductance properties, which can lead to strong coupling between active and reactive power outputs. This phenomenon may cause considerable impacts on the normal operation of microgrid, grid-connected control, and the power allocation among the DGs. it is important to investigate the power coupling effect for the improvement of operational stability and economic efficiency of the microgrid [9]. This paper proposes a power decoupling method, which directly compensates for the coupling component of the power loop. The decoupling is attained by use of a decoupling matrix in the VSG control unit and making the power transfer matrix a diagonal matrix This method is based on the linearized power transfer model.
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