Grid-connected converter forecast control system with voltage compensation and control method

Abstract

The invention discloses a grid-connected converter forecast control system with voltage compensation, and also discloses a grid-connected converter forecast control method having voltage compensation.The grid-connected converter forecast control method having voltage compensation comprises the steps of firstly, estimating a grid-connected converter power according to energy change of a capacitance electric field, calculating current changing quantity of an inductor according to the energy changing quantity of the capacitance electric field, and forecasting an instruction current; secondly, designing compensation virtual capacitance according to the energy change of the capacitance electric field, and compensating a DC bus voltage under disturbance; and finally, building a linear control relation between the DC bus voltage and the inductor current. By the grid-connected converter forecast control method, the problems that bidirectional flowing of power cannot be achieved, parameter adjustment exists and the system parameter influence is large due to low inertia and poor disturbance-resistant capability of a DC microgrid and control of a grid-connected converter in the prior art aresolved.

Description

technical field [0001] The invention belongs to the technical field of new energy power generation and electric energy conversion, and in particular relates to a predictive control system for a grid-connected converter with voltage compensation, and also relates to a predictive control method for a grid-connected converter with voltage compensation. Background technique [0002] In recent years, with the decline of fossil energy, the serious pollution of the global environment, and the continuous expansion of people's demand for electric energy, the disadvantages of the traditional power system have become increasingly prominent, and people have turned their attention to renewable energy power generation. Therefore, a new electric energy carrier DC microgrid has emerged as the times require. As an important part of the future smart distribution network, it can more efficiently and reliably accept distributed renewable energy generation systems such as wind and light, energy s...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a grid-connected converter predictive control system with voltage compensation, which solves the problem of low inertia and poor anti-disturbance ability of the DC micro-grid in the prior art and the inability of the control of the grid-connected converter to realize bidirectional flow of power And there are problems of parameter adjustment and being greatly affected by system parameters

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