Improved finite set model prediction control method suitable for inverter

A finite set model and predictive control technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of affecting the power quality of the inverter, the switching frequency is not fixed, and endangering the safety of the grid and stability issues, to achieve good adaptability, less calculation, and improve power quality

Active Publication Date: 2017-09-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The switching frequency of the inverter under the finite set model predictive control is not fixed, so the large current ripple has seriously affected the power quality of the inverter output; if it is not improved, when these current ripples are large After a large number of inverters are connected to the grid, it will even endanger the safety and stability of the grid operation

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  • Improved finite set model prediction control method suitable for inverter
  • Improved finite set model prediction control method suitable for inverter
  • Improved finite set model prediction control method suitable for inverter

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[0025] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0026] Such as figure 1 As shown, the topology of a single-phase grid-connected inverter consists of four parts: input DC source, single-phase inverter bridge, output filter, and AC grid. S 1 ~S 4 represent four metal-oxide-semiconductor field-effect transistors with antiparallel diodes, V in is the DC bus voltage, i is the grid-connected current of the inverter, L is the grid-side filter inductance, r is the equivalent series impedance of the circuit, v g is the grid voltage (grid-side voltage). In order to simply and clearly illustrate the technical solution of this invention, the filter adopts an L-shaped filter, but it is not limited to an L-shaped filter. Depen...

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Abstract

The invention discloses an improved finite set model prediction control method suitable for an inverter. According to the method, the AC bias of current is eliminated by predicting the ripple of the output current and introducing the feedforward link of the current ripple on the basis of finite set model prediction control so that the total harmonic content of the grid-connected inverter output current can be reduced and the quality of electric energy conversion can be effectively enhanced. The improved finite set model prediction control algorithm having universality is researched based on the full-bridge L-type grid-connected inverter so that the total harmonic content of the output current can be effectively reduced on the basis of finite set model prediction control of the single-phase grid-connected inverter. The method can be greatly suitable for application of various finite set model prediction control algorithms on the inverter.

Description

technical field [0001] The invention relates to an improved finite set model predictive control method suitable for inverters, in particular to a novel finite set model predictive control algorithm suitable for inverters based on current ripple prediction and ripple feedforward, belonging to Inverter control technology field. Background technique [0002] As the research on finite set model predictive control (FCS-MPC) in power converters is getting more and more in-depth, some inherent defects of it are gradually exposed. The large current ripple caused by the discrete control method is one of the problems that needs to be solved urgently. The switching frequency of the inverter under the finite set model predictive control is not fixed, so the large current ripple has seriously affected the power quality of the inverter output; if it is not improved, when these current ripples are large After a large number of inverters are connected to the grid, it will even endanger th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387
CPCH02M7/5387
Inventor 曹鑫王雪瑞袁瑞郝振洋
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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