Three-level PWM (Pulse-Width Modulation) rectifier direct power control method

A power control and rectifier technology, applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc., can solve the problems of poor switch table effect and no influence degree

Inactive Publication Date: 2012-07-04
TIANJIN UNIV
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Problems solved by technology

However, many three-level rectifier DPCs use qualitative analysis in the design process of the switch table, and do not give the specific influence degree of each space voltage vector on the active power and reactive power in each sector, so that the traditional design of the switch table Ineffective at controlling power

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  • Three-level PWM (Pulse-Width Modulation) rectifier direct power control method

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Embodiment Construction

[0026] The three-level PWM rectifier direct power control method based on grid voltage oriented switch table requires a higher sampling frequency, but it does not require coordinate rotation transformation and modulation strategy, and directly selects the appropriate basic vector from the switch table according to the hysteresis comparison results Effectively control the changes of instantaneous active power and reactive power, the control algorithm and control structure are simple, the dynamic response is fast, and the robustness is strong. The switch table is based on the discretized instantaneous power control model of the rectifier, by analyzing the specific influence degree of each basic vector in each sector on the instantaneous power, the power hysteresis is multi-level quantized, and at the same time, it takes into account the DC side. Point potential balance control is established.

[0027] The realization process of the present invention is as follows:

[0028] fig...

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Abstract

The invention discloses a three-level PWM (Pulse-Width Modulation) rectifier direct power control method, which comprises the following steps of: deducing an instantaneous power control model of a rectifier by utilizing a high frequency mathematical model and an instantaneous power theory of the three-level rectifier; substituting basic vectors corresponding to 27 groups of switch statuses of a three-level converter into the instantaneous power control model, and carrying out normalization to obtain formulas of active power variation rate and reactive power variation rate under the action of the basic vectors; calculating the active power variation rate and the reactive power variation rate corresponding to each basic vector in a whole vector space, and classifying basic vectors according to the types of the vectors, the active and the reactive power variation trends and the variation rates; and quantizing the reactive power variation rate needed to be tracked into two levels, quantizing the active power variation rate into four levels, and building a switch list controlled by rectifier direct power. The method can realize network side unit power factors, quickly stabilize direct current bus voltage and balanced midpoint potential, and is more effective for fast tracking the instantaneous active power and reactive power.

Description

technical field [0001] The invention relates to the field of converter control for power electronics and electric transmission, in particular to a direct power control method for a three-level pulse width modulation (Pulse Width Modulation, PWM) rectifier. Background technique [0002] In high-voltage and high-power applications, due to the limitation of the power level of the switching device, the traditional two-level rectifier can no longer meet the requirements, and the diode-clamped (Neutral Point Clamped, NPC) three-level PWM rectifier can not only realize energy bidirectional flow, The power factor is controllable, and it also has the advantages of low pressure of switching devices, low switching frequency, and less harmonic content of input current, which makes it more and more widely used in the engineering field. [0003] The traditional NPC three-level PWM rectifier adopts a control method based on grid voltage-oriented space voltage vector synthesis, which requir...

Claims

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Application Information

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IPC IPC(8): H02M7/219
Inventor 夏长亮史婷娜王建耿强宋战锋
Owner TIANJIN UNIV
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