CN104467378A - Modular multi-level converter trigger pulse generating system and method - Google Patents

Abstract

The invention discloses a modular multi-level converter trigger pulse generating system and method. The method comprises the steps that a, an SPWM pulse generating module generates standard SPWM pulses according to carrier waves generated by a carrier wave generating module and sinusoidal modulation waves input by a modulation wave input interface; b, a demultiplex module expands one path of standard SPWM pulses generated by the SPWM pulse generating module into multiple paths of standard SPWM pulses; c, latch delay modules receive the multiple paths of standard SPWM pulses output by the demultiplex module respectively and output the standard SPWM pulses in a delay mode, and therefore N phase shift SPWM pulses with the fixed phase difference with the standard SPWM pulses are obtained. The modular multi-level converter trigger pulse generating system and method have the same control effect as the carrier wave phase shift SPWM, and are easier to achieve.

Description

Modularization multi-level converter trigger impulse generation system and generation method

Technical field

The invention belongs to many level loop technology control field, be specifically related to a kind of modularization multi-level converter trigger impulse generation system and generation method.

Background technology

Modular multilevel converter (MMC, Moudlar Multilevel Convertor) be adopt all-controlling power electronics device to realize the high pressure of AC-DC or AC-AC conversion, the one of Large Copacity voltage source converter, every cascade arrangement by the power model of multiple full-bridge or half-bridge structure of Modular multilevel converter forms.The method of controlling switch generally adopted in current Modular multilevel converter is carrier phase sinusoidal pulse width modulation (CPS-SPWM), the basic thought of CPS-SPWM technology be adopt multiple between two between the carrier wave of phase mutual fixed skew go to modulate same sine wave to obtain the SPWM trigger impulse of each power model in Modular multilevel converter.CPS-SPWM technology needs to generate multiple carrier wave in use, therefore needs multiple carrier generating circuit and comparison circuit module, and implementation method is complicated.The present invention proposes a kind of method of controlling switch based on SPWM pulse phase shifting, the method implementation method is simple, and has the control effects identical with carrier phase sinusoidal pulse width modulation.

Summary of the invention

The present invention seeks to: for the deficiencies in the prior art, provide a kind of modularization multi-level converter trigger impulse generation system and generation method, it has the control effects identical with carrier phase sinusoidal pulse width modulation and is easier to realize.

Technical scheme of the present invention is: described modularization multi-level converter trigger impulse generation system, comprising:

Carrier wave generation module, for generation of carrier wave;

Modulating wave input interface, for receiving the sinusoidal modulation wave of outside input;

SPWM pulse generating module, generates benchmark SPWM pulse for the carrier wave produced according to described carrier wave generation module and the sinusoidal modulation wave inputted by described modulating wave input interface;

Multichannel distribution module, becomes multichannel for the accurate SPWM pulse expansion of a roadbed generated by described SPWM pulse generating module; And

N number of latch time delay module, described N be not less than 2 natural number, described N number of latch time delay module is used for receiving the multichannel benchmark SPWM pulse that exported by described multichannel distribution module (4) respectively and accurate for this roadbed SPWM pulse delay is exported the phase shift SPWM pulse obtaining having with benchmark SPWM pulse fixed skew.

Utilize said system as follows to the method generating modularization multi-level converter trigger impulse:

The carrier wave that a.SPWM pulse generating module produces according to carrier wave generation module and the sinusoidal modulation wave inputted by modulating wave input interface generate benchmark SPWM pulse;

B. the accurate SPWM pulse expansion of a roadbed that SPWM pulse generating module generates by multichannel distribution module becomes multichannel;

C. each latches time delay module and receives the multichannel benchmark SPWM pulse that exported by multichannel distribution module respectively and export, benchmark SPWM pulse delay from obtaining the N number of phase shift SPWM pulse having fixed skew with benchmark SPWM pulse;

The low and high level width of the phase shift SPWM pulse that each latch time delay module exports and number of pulses and benchmark SPWM pulsion phase with, be only that the rising edge of phase shift SPWM pulse of each latch time delay module output and the rising edge of trailing edge and benchmark SPWM pulse and trailing edge have fixing T lag time _n, and

Described lag time $T_n=(n-1)\frac{T_c}{N},$

In above formula, T _nfor lag time, T _cfor carrier cycle, n is the numbering of phase-locked time delay module, n=1,2,3 ..., N is the sum of phase-locked time delay module, N>=n.

Advantage of the present invention is: the present invention has the control effects identical with carrier phase sinusoidal pulse width modulation and is easier to realize.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the invention will be further described:

Fig. 1 is that modularization multi-level converter trigger impulse of the present invention generates Method And Principle figure.

Wherein: 1-carrier wave generation module, 2-modulating wave input interface, 3-SPWM pulse generating module, 4-multichannel distribution module, 5-first latches time delay module, and 6-first latches time delay module, and 7-first latches time delay module, the N number of latch time delay module of 8-.

Embodiment

Embodiment:

With reference to shown in Fig. 1, this modularization multi-level converter trigger impulse generation system that the embodiment of the present invention provides comprises carrier wave generation module 1, modulating wave input interface 2, SPWM pulse generating module 3, multichannel distribution module 4 and N number of latch time delay module, described N be not less than 2 natural number.Wherein carrier wave generation module 1 is for generation of carrier wave, modulating wave input interface 2 is for receiving the sinusoidal modulation wave of outside input, SPWM pulse generating module 3 generates benchmark SPWM pulse for the carrier wave produced according to described carrier wave generation module 1 and the sinusoidal modulation wave inputted by described modulating wave input interface 2, multichannel distribution module 4 becomes multichannel for the accurate SPWM pulse expansion of a roadbed generated by described SPWM pulse generating module 3, described N number of latch time delay module is used for receiving the multichannel benchmark SPWM pulse that exported by described multichannel distribution module 4 respectively and accurate for this roadbed SPWM pulse delay is exported the phase shift SPWM pulse obtaining having with benchmark SPWM pulse fixed skew.

The multichannel benchmark SPWM pulse one_to_one corresponding that each latch time delay module described and multichannel distribution module export.

Refer again to shown in Fig. 1, utilize said system as follows to the method generating modularization multi-level converter trigger impulse:

The carrier wave that a.SPWM pulse generating module 3 produces according to carrier wave generation module 1 and the sinusoidal modulation wave inputted by modulating wave input interface 2 generate benchmark SPWM pulse.

B. the accurate SPWM pulse expansion of a roadbed that SPWM pulse generating module 3 generates by multichannel distribution module 4 becomes multichannel (being generally at least N road).

C. each latches time delay module and receives the multichannel benchmark SPWM pulse that exported by multichannel distribution module 4 respectively and export, benchmark SPWM pulse delay from obtaining the phase shift SPWM pulse having fixed skew with benchmark SPWM pulse.One is latched time delay module and receives only the accurate SPWM pulse of a roadbed that exported by multichannel distribution module 4 and benchmark SPWM pulse delay exported the phase shift SPWM pulse obtaining having with benchmark SPWM pulse fixed skew, and different latch time delay modules receives the accurate SPWM pulse of different roadbed exported by multichannel distribution module 4, so N number of latch time delay module, just obtains the N number of phase shift SPWM pulse having fixed skew with benchmark SPWM pulse altogether; This N number of phase shift SPWM pulse namely as the trigger impulse of modularization multi-level converter, for control module multilevel converter.

The low and high level width of the phase shift SPWM pulse that each latch time delay module exports and number of pulses and benchmark SPWM pulsion phase with, be only that the rising edge of phase shift SPWM pulse of each latch time delay module output and the rising edge of trailing edge and benchmark SPWM pulse and trailing edge have fixing lag time.

In order to the content allowing reader clearly can understand described step c intuitively, then step c content is explained as follows in detail:

First is latched time delay module 5 and receives the first via benchmark SPWM pulse that exported by multichannel distribution module 4 and exported by accurate for this roadbed SPWM pulse delay, thus obtain the phase shift SPWM pulse having fixed skew with benchmark SPWM pulse.

Second is latched time delay module 6 and receives the second roadbed accurate SPWM pulse of being exported by described multichannel distribution module 4 and exported by accurate for this roadbed SPWM pulse delay, thus obtain the phase shift SPWM pulse having fixed skew with benchmark SPWM pulse.

3rd is latched time delay module 7 and receives the 3rd roadbed accurate SPWM pulse that exported by described multichannel distribution module 4 and exported by accurate for this roadbed SPWM pulse delay, thus obtain the phase shift SPWM pulse having fixed skew with benchmark SPWM pulse.

……

N-th latches time delay module reception, and by described multichannel distribution module, (accurate for this roadbed SPWM pulse delay also exports by 4 the n-th roadbed accurate SPWM pulses exported, thus obtains the phase shift SPWM pulse having fixed skew with benchmark SPWM pulse.This n-th latch the low and high level width of phase shift SPWM pulse that time delay module exports and number of pulses and benchmark SPWM pulsion phase with, just this n-th latches the rising edge of phase shift SPWM pulse of time delay module output and the rising edge of trailing edge and benchmark SPWM pulse and trailing edge and has fixing T lag time _n, and described lag time

$T_n=(n-1)\frac{T_c}{N},$

In above formula, T _nfor lag time, T _cfor carrier cycle, n is the numbering of phase-locked time delay module, n=1,2,3 ..., N is the sum of phase-locked time delay module, N>=n.

Be not difficult to find out:

During n=1, lag time T _n=0, namely the rising edge of phase shift SPWM pulse of first latch time delay module 5 output and the lag time between the rising edge of trailing edge and benchmark SPWM pulse and trailing edge are 0.

During n=2, lag time namely the rising edge of phase shift SPWM pulse of second latch time delay module 6 output and the lag time between the rising edge of trailing edge and benchmark SPWM pulse and trailing edge are

During n=3, lag time namely the rising edge of phase shift SPWM pulse of the 3rd latch time delay module 7 output and the lag time between the rising edge of trailing edge and benchmark SPWM pulse and trailing edge are

During n=N, lag time namely the rising edge of phase shift SPWM pulse that exports of the N number of latch time delay module 8 and the rising edge of trailing edge and benchmark SPWM pulse and the lag time between declining are $(N-1)\frac{T_c}{N}.$

The a series of rising edge with benchmark SPWM pulse of acquisition like this and trailing edge have N number of phase shift SPWM pulse of fixing lag time, this N number of phase shift SPWM pulse namely as the trigger impulse of modularization multi-level converter, for control module multilevel converter.The concrete value of described N need be determined according to the quantity of power model in controlled device and polylith multilevel converter.

Be understood that, each latches the rising edge of phase shift SPWM pulse and the size of lag time between the rising edge of trailing edge and benchmark SPWM pulse and trailing edge that time delay module exports, controls the delay time that benchmark SPWM pulse delay exports by latching time delay module---and the n-th latch time delay module receives the n-th roadbed accurate SPWM pulse of being exported by multichannel distribution module 4 and by accurate for this roadbed SPWM pulse delay export, so the rising edge of phase shift SPWM pulse of this n-th latch time delay module output and T lag time between the rising edge of trailing edge and benchmark SPWM pulse and trailing edge _nalso be just .

Certainly, above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to people can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations of doing according to the Spirit Essence of main technical schemes of the present invention or modification, all should be encompassed within protection scope of the present invention.

Claims (2)

1. a modularization multi-level converter trigger impulse generation system, is characterized in that this system comprises:

Carrier wave generation module (1), for generation of carrier wave;

Modulating wave input interface (2), for receiving the sinusoidal modulation wave of outside input;

SPWM pulse generating module (3), generates benchmark SPWM pulse for the carrier wave produced according to described carrier wave generation module (1) and the sinusoidal modulation wave inputted by described modulating wave input interface (2);

Multichannel distribution module (4), becomes multichannel for the accurate SPWM pulse expansion of a roadbed described SPWM pulse generating module (3) generated; And

N number of latch time delay module, described N be not less than 2 natural number, described N number of latch time delay module is used for receiving the multichannel benchmark SPWM pulse that exported by described multichannel distribution module (4) respectively and accurate for this roadbed SPWM pulse delay is exported the phase shift SPWM pulse obtaining having with benchmark SPWM pulse fixed skew.

2. utilize the system described in claim 1 to generate a method for modularization multi-level converter trigger impulse, it is characterized in that the method is:

The carrier wave that a.SPWM pulse generating module (3) produces according to carrier wave generation module (1) and the sinusoidal modulation wave inputted by modulating wave input interface (2) generate benchmark SPWM pulse;

B. the accurate SPWM pulse expansion of a roadbed that SPWM pulse generating module (3) generates by multichannel distribution module (4) becomes multichannel;

C. each latches time delay module and receives the multichannel benchmark SPWM pulse that exported by multichannel distribution module (4) respectively and export, benchmark SPWM pulse delay from obtaining the N number of phase shift SPWM pulse having fixed skew with benchmark SPWM pulse;

The low and high level width of the phase shift SPWM pulse that each latch time delay module exports and number of pulses and benchmark SPWM pulsion phase with, be only that the rising edge of phase shift SPWM pulse of each latch time delay module output and the rising edge of trailing edge and benchmark SPWM pulse and trailing edge have fixing T lag time _n, and

Described lag time $T_n=(n-1)\frac{T_c}{N},$

In above formula, T _nfor lag time, T _cfor carrier cycle, n is the numbering of phase-locked time delay module, n=1,2,3 ..., N is the sum of phase-locked time delay module, N>=n.