Abstract
This paper focus on the power fluctuations of the virtual synchronous generator(VSG) during the transition process. An improved virtual synchronous generator(IVSG) control strategy based on feed-forward compensation is proposed. Adjustable parameter of the compensation section can be modified to achieve the goal of reducing the order of the system. It can effectively suppress the power fluctuations of the VSG in transient process. To verify the effectiveness of the proposed control strategy for distributed energy resources inverter, the simulation model is set up in MATLAB/SIMULINK platform and physical experiment platform is established. Simulation and experiment results demonstrate the effectiveness of the proposed IVSG control strategy.
Highlights
Conventional fossil energy has been unable to meet the needs of sustainable development of human society
Compared with conventional droop control strategy, the results show that the VSG has a great advantage[22,23,24,25]
The value of the inertia is set to 0.2 kgm[2]
Summary
Mechanical power (Pm) is collected by the power-frequency controller, and excitation voltage (E0) is collected by the excitation controller respectively. The output voltage of the inverter via LC filter circuit creates the grid connected voltage. In this way, the distributed inverter has the characteristics that are similar to the synchronous generator. Second-order model is widely applied in the VSG ontology control strategy. The mathematical model of synchronous generator is expressed as follows: Mm − Me dθ = ω dt. Δ is the phase difference between them In this circuit, Z = R + jX, ‘Z’ is the sum of the output impedance of the inverter and the line impedance.
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