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Current forecasting dead-beat control method of Z source type interconnected inverter and control device thereof

A dead-beat control and current prediction technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., to achieve the effect of overcoming sampling delay

Inactive Publication Date: 2010-05-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a current prediction dead-beat control method and a control device for a Z-source grid-connected inverter, so as to overcome the defect of sampling delay in the existing control method

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  • Current forecasting dead-beat control method of Z source type interconnected inverter and control device thereof
  • Current forecasting dead-beat control method of Z source type interconnected inverter and control device thereof
  • Current forecasting dead-beat control method of Z source type interconnected inverter and control device thereof

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specific Embodiment approach 1

[0011] Specific implementation mode one: the following combination figure 1 This embodiment will be described concretely through FIG. 6 . The control method of this embodiment includes the following steps: its control method includes the following steps: 1. Collect the grid-connected current and grid voltage signal at the sampling time point of each sampling period; 2. Collect the grid voltage phase and calculate its The sine value is multiplied by the given grid-connected current amplitude to obtain the instantaneous value of the given signal of the grid-connected current at the sampling time point synchronous with the grid voltage; 3. According to the voltage and current signals obtained in step 1, the next The instantaneous value of the grid-connected current at the sampling time point; 4. Bring the calculation results of steps 2 and 3 into the voltage equation of the grid-connected inverter to calculate the given value of the output voltage of the Z-source inverter at the ...

specific Embodiment approach 2

[0054] Specific implementation mode two: the following combination Figure 7 This embodiment will be specifically described. The current prediction dead-beat control device of the Z-source grid-connected inverter consists of a grid-connected current detection circuit 1, a grid voltage detection circuit 2, a synchronous signal generation circuit 3, an isolation drive circuit 4, a central processing unit 5 and a capacitor voltage detection circuit. 6 components, the signal output terminal of the grid-connected current detection circuit 1 is connected to a signal input terminal of the central processing unit 5 to realize the sampling of the grid-connected current value, and the output terminal of the grid voltage detection circuit 2 is connected to another signal of the central processing unit 5 The input terminal is to realize the sampling of the grid voltage signal, the output terminal of the grid voltage detection circuit 2 is also connected with the signal input terminal of t...

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Abstract

The invention relates to a current forecasting dead-beat control method of a Z source type interconnected inverter and a control device thereof, which belongs to the field of electrical energy conversion and is used for interconnected power generation. The current forecasting dead-beat control method overcomes the defect of sampling delay of the conventional control method. In each sampling period, a robust prediction algorithm is adopted to forecast interconnected current of the next period, and the needed inverted voltage is calculated according to a voltage equation of the inverter to realize the deadbeat control of the interconnected current. A single-voltage space vector modulating method with a through zero vector is used for generating a through-state pulse-width modulation wave shapes of the inverted voltage to control the DC capacitance voltage and the interconnected inverted voltage. The control device comprises a central processing unit, a synchronous signal generating circuit, a voltage and current testing circuit and an isolated driving circuit. The current forecasting dead-beat control method of the Z source type interconnected inverter has high control precision, is easy to digitally realize, has stronger inverted-side inductance parameter variation robustness, and the like.

Description

technical field [0001] The invention relates to a current prediction dead-beat control method and a realization device of a Z-source type grid-connected inverter, belonging to the field of electric energy conversion. Background technique [0002] Today, the global energy shortage problem is becoming increasingly prominent, and renewable energy power generation represented by wind power and solar power generation has become an effective way to solve this problem. In terms of the utilization of renewable energy, grid-connected power generation has become the mainstream of power generation utilization because of its advantages such as flexible power generation, convenient power transmission, and easy secondary conversion. [0003] In the grid-connected power generation system, the traditional grid-connected inverter adopts the DC-DC-AC two-stage power conversion structure, resulting in relatively low conversion efficiency of the system, and at the same time, the volume is large...

Claims

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Application Information

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IPC IPC(8): H02M7/537
Inventor 吴凤江孙立志孙力赵克王有琨孙光亚修永文
Owner HARBIN INST OF TECH
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