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Hysteresis loop and carrier hybrid modulation method for voltage inverter

A technology of voltage-type inverter and hybrid modulation, which is applied in the direction of electrical components, output power conversion devices, and conversion of AC power input to DC power output, etc. question

Inactive Publication Date: 2011-07-20
江西中能电气科技股份有限公司
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AI Technical Summary

Problems solved by technology

In order to quickly and accurately track the harmonic current of the power grid, the power active filter must adopt an excellent current control method. Simple, usually there are methods such as one-step predictive control, proportional-integral control in a synchronous rotating coordinate system, proportional resonance control, and repetitive control. Obtain the modulated wave, and then realize the control of the inverter output current through carrier modulation or space vector modulation, but usually there are problems such as complex implementation and difficult guarantee of stability
Hysteresis current control is simple, fast in response, high in accuracy, and does not have stability problems; but its disadvantages are that its switching frequency is variable, there is interphase interference, and there is a phenomenon of redundancy in a certain input phase, and Output filter design is difficult

Method used

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  • Hysteresis loop and carrier hybrid modulation method for voltage inverter
  • Hysteresis loop and carrier hybrid modulation method for voltage inverter
  • Hysteresis loop and carrier hybrid modulation method for voltage inverter

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Embodiment 1

[0033] The topology of the three-phase voltage source inverter is as follows: figure 1 As shown, according to the basic circuit theory, the following system equations can be obtained:

[0034]

[0035] Σ x = a , b , c i x = 0 - - - ( 2 )

[0036] In formula (1), point o is the midpoint of the intermediate DC voltage of the three-phase inverter; u xo is the voltage from the AC terminal of the inverter to point o, and u xo Only two values: u xo =±0.5u dc , u dc is the intermediate DC voltage, e xN is the counter electromotive force, i x It is a three-phase alternating current, where x∈{a, b, c}. The above equations are of universal significance. Depending on the type of back electromotive force, they can represent mo...

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Abstract

The invention discloses a hysteresis loop and carrier hybrid modulation method for a voltage inverter. The hysteresis loop and carrier hybrid modulation method is characterized in that: two phases of current in A, B and C phases of current are controlled based on two digital hysteresis loop comparators, and the third phase of current is controlled by adopting a carrier modulator; and the voltage inverter is a six-insulated gate bipolar transistor (IGBT)-based three-phase bridge inverter. In the method, not only the advantages realization simplicity, quick response and the like of hysteresis loop are maintained, and the advantages of switching frequency consistence and low current harmonic distortion of carrier modulation are integrated.

Description

technical field [0001] The invention relates to a hysteresis and carrier mixed modulation method of a voltage type inverter. Background technique [0002] Three-phase voltage-type inverters have been widely used in applications such as AC drives, power quality regulation, renewable energy generation, and uninterruptible power supplies. Most of the voltage-type inverters work in current control mode, so the inverter The pros and cons of performance mainly depend on the quality of the current loop control, especially in the application of power active filters, which put forward higher requirements for current control. In order to quickly and accurately track the harmonic current of the power grid, the power active filter must adopt an excellent current control method. Simple, usually there are methods such as one-step predictive control, proportional-integral control in a synchronous rotating coordinate system, proportional resonance control, and repetitive control. Obtain th...

Claims

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Application Information

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IPC IPC(8): H02M7/5387
Inventor 粟梅孙尧李幸王辉于晶荣杨建敖杰肖亮
Owner 江西中能电气科技股份有限公司
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