CN109450272B - High-power auxiliary converter and control method thereof - Google Patents

High-power auxiliary converter and control method thereof Download PDF

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Publication number
CN109450272B
CN109450272B CN201811306965.8A CN201811306965A CN109450272B CN 109450272 B CN109450272 B CN 109450272B CN 201811306965 A CN201811306965 A CN 201811306965A CN 109450272 B CN109450272 B CN 109450272B
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inverter
voltage
value
bus voltage
current
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CN109450272A (en
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李东
高永军
张宇龙
葸代其
王雷
王喜乐
李岩
牛剑博
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CRRC Yongji Electric Co Ltd
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CRRC Yongji Electric Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/443—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/45—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M5/451—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output voltage or frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/505—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/515—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only

Abstract

The invention relates to a converter, in particular to a high-power auxiliary converterAnd a control method thereof. The problem of output voltage fluctuation of the high-power auxiliary converter is solved. The invention is used for correcting the current loop set value of the three-phase inversion double closed-loop controller by extracting the fluctuation of the intermediate direct current bus voltagei d *、i q *Therefore, the oscillation of the output voltage of the intermediate bus and the inverter can be effectively reduced, and the method has wide application prospect in engineering. The invention is especially suitable for AC drive electric locomotive.

Description

High-power auxiliary converter and control method thereof
Technical Field
The invention relates to a converter, in particular to a high-power auxiliary converter and a control method thereof. The high-power auxiliary converter and the control method thereof are particularly suitable for the alternating current transmission electric locomotive.
Background
In recent years, with the continuous development of railway technology, electric locomotives have become main locomotive models for railway transportation, and the modularization and high power of auxiliary converters of the electric locomotives have become development trends, which puts higher demands on the control of the auxiliary converters. Especially after the output power of the auxiliary converter is increased, the stability of the whole auxiliary control system is reduced, and even the system is diverged.
The main circuit topology of the high-power auxiliary converter comprises four modules, a thyristor rectification module, a direct-current bus filtering module, an inversion module and an output filtering module. The input alternating current is rectified at 1000V by a thyristor semi-controlled bridge of a thyristor rectification module, the intermediate direct current is obtained after the intermediate bus LC filtering of a direct current bus filtering module, and then 380V alternating current is obtained after the intermediate direct current is filtered by an output inductance capacitor of an output filtering module through a three-phase auxiliary inverter of an inversion module.
The control strategy of the inverter uses voltage-current double closed-loop control under a rotating coordinate system. The alternating current under the static coordinate system is converted into direct current under the rotating coordinate system, and static error-free output can be obtained by using a PI controller. Firstly, modeling is carried out on a controlled object under a rotating coordinate system, then a controller is arranged on the model under the rotating coordinate system, the output of the controller is converted into a static coordinate system to obtain a modulation wave, and then a switching tube is controlled to generate three-phase alternating current.
As shown in fig. 1, a controller of a conventional inverter adopts voltage and current double closed-loop control; the outer loop includes two PI regulators (proportional integral regulators), PI1 and PI2, the inverter output voltage setpoint ud *And the collected value u of the output voltage of the inverterdAs input of PI1, inverter output voltage set value uq *And the collected value u of the output voltage of the inverterqAs input to PI 2; the inner loop also includes two PI regulators, PI3 and PI4, the inverter output current setpoint id *And the collection value i of the output current of the inverterdAs input of PI3, inverter output current set value iq *And the collection value i of the output current of the inverterqAs input to PI4, where id *Under the influence of ud、ud *While controlling, is also coupled by omega CfuqWhere ω is the output angular frequency, CfIs the capacitance value of the output filter. i.e. iq *Under the condition of receiving electricity uq、uq *While controlling, is also coupled by omega CfudThe disturbance of (2); current inner loop control quantity Vd、VqAs output of the controller for generating PWM pulse signal for controlling the inverter, wherein VdUnder receiving electricity id *、id、udWhile controlling, also receives omega LmiqInfluence of disturbance, LmInductance value of low-pass filter, VqUnder receivingTo electricity iq *、iq、uqWhile controlling, also receives omega LmidThe effect of the disturbance.
Because the thyristor control frequency is lower, and after the auxiliary output power is increased, the intermediate bus LC filter inductance capacitance resonates, so that the intermediate bus voltage oscillation is increased, and the output voltage fluctuation of the auxiliary converter AC380 is larger. In engineering, the problem of unstable control of the high-power auxiliary converter is often solved in a mode of serially adding a resistor or adding a supporting capacitor on the middle direct-current bus side of the auxiliary converter, but energy loss can be increased through serially connecting the resistor, system efficiency is reduced, and the size and cost of the auxiliary converter can be increased by increasing the supporting capacitor.
Disclosure of Invention
The invention solves the problem of output voltage fluctuation of a high-power auxiliary converter and provides the high-power auxiliary converter and a control method thereof. The high-power auxiliary converter and the control method thereof are used for correcting a current loop i of an inverter controller by extracting the fluctuation of the voltage of an intermediate direct current busd *、iq *And setting a value, so that the oscillation of the output voltage of the converter can be effectively reduced.
The invention is realized by adopting the following technical scheme: a control method for high-power auxiliary converter features that the voltage-current dual-closed loop control is used to extract the voltage fluctuation of intermediate DC bus for correcting the current loop set value id *、iq *So as to reduce the oscillation of the output voltage of the converter; the fluctuation value delta U of the intermediate DC bus voltage is equal to Udc－Utd，UdcFor real-time sampled values of intermediate DC bus voltage, UtdThe real-time sampling value of the intermediate direct current bus voltage is a stable intermediate direct current bus voltage value obtained by filtering only the LC resonance frequency of the intermediate direct current bus filter inductance capacitor through a wave trap; for correcting the current loop set value id *、iq *Correction value Δ i ofd、ΔiqComprises the following steps:
Δid＝Δiq＝(k1|ΔU/|α+k2|ΔU/|β)ΔU
wherein β is more than 1, 0 is more than α is less than 1, k1>0，k2>0, is a constant greater than 0, a, β, k1、k2Adjusting the voltage to be within an acceptable range of fluctuation of the intermediate direct current bus voltage according to actual conditions, wherein 50V is selected, β is reasonably obtained according to experiments of different load powers, β is selected to be 2.73, a is 0.84 according to actual debugging results of experimental sites, and k is adjusted to be within an acceptable range of fluctuation of the intermediate direct current bus voltage according to actual conditions1、k2The correction coefficients for the two compensation terms in the equation are fine adjustments for the two compensation terms, which are usually not selected too much, but too much selection results in the loss of | Δ U/. luminanceαAnd | Δ U/. mu.βThe original functions of the two, k is selected by the invention1＝k21. As can be seen from the above formula, when | Δ U->K, i.e. the range of the intermediate voltage fluctuation is greater than 50V2|ΔU/|βDominant, i.e. β dominant, id *、iq *The compensation force is large so as to adjust the fluctuation of the intermediate voltage to be less than 50V as soon as possible. When | Δ U |<Time, i.e. the intermediate voltage fluctuation is less than 50V, k1|ΔU/|αPlays a leading role, i.e. a plays a leading role, id *、iq *The compensation force is small, and the middle bus voltage is adjusted slowly. Thus, the auxiliary inversion can be performed in real timed *、iq *And compensation is adjusted, and the delta U is used as feedback of the auxiliary inversion control system, so that oscillation of the auxiliary converter control system can be well reduced. The problems of volume increase and efficiency reduction caused by changing main circuit parameters in the prior art are effectively solved.
A high-power auxiliary converter comprises a thyristor rectification module, a direct-current bus filtering module and an inversion module, wherein a controller of an inverter in the inversion module adopts voltage and current double closed-loop control; the outer loop includes two PI regulators, PI1 and PI2, the inverter output voltage setpoint ud *And the collected value u of the output voltage of the inverterdAs input of PI1, inverter output voltage set value uq *And the collected value u of the output voltage of the inverterqAs input to PI 2; the inner loop also includes two PI regulators, PI3 and PI4, the inverter output current setpoint id *And the collection value i of the output current of the inverterdAs input of PI3, inverter output current set value iq *And the collection value i of the output current of the inverterqAs input to PI 4; the PI3 input also has Δ idThe input to PI4 is also Δ iq，
Δid＝Δiq＝(k1|ΔU/|α+k2|ΔU/|β)ΔU
Wherein β is more than 1, 0 is more than α is less than 1, k1>0，k2>0, is a constant greater than 0, a, β, k1、k2Adjusting according to the actual condition; delta U is the fluctuation value of the intermediate DC bus voltage, and is equal to Udc－Utd，UdcFor real-time sampled values of intermediate DC bus voltage, UtdThe real-time sampling value of the intermediate direct current bus voltage is a stable intermediate direct current bus voltage value obtained by filtering only the LC resonance frequency of the intermediate direct current bus filter inductance capacitor through a wave trap.
The invention is used for correcting the current loop set value i of the three-phase inversion double closed-loop controller by extracting the fluctuation of the intermediate direct current bus voltaged *、iq *Therefore, the oscillation of the output voltage of the intermediate bus and the inverter can be effectively reduced, and the method has wide application prospect in engineering. The invention is especially suitable for AC drive electric locomotive.
Drawings
Fig. 1 is a block diagram illustrating inversion control of the auxiliary converter according to the present invention.
Detailed Description
Example 1
A control method for high-power auxiliary converter features that the voltage and current dual-closed loop control is used to extract the voltage fluctuation of intermediate DC bus for correcting the power controlled by inverterFlow loop set value id *、iq *So as to reduce the oscillation of the output voltage of the converter; the fluctuation value delta U of the intermediate DC bus voltage is equal to Udc－Utd，UdcFor real-time sampled values of intermediate DC bus voltage, UtdThe real-time sampling value of the intermediate direct current bus voltage is a stable intermediate direct current bus voltage value obtained by filtering only the LC resonance frequency of the intermediate direct current bus filter inductance capacitor through a wave trap; for correcting the current loop set value id *、iq *Correction value Δ i ofd、ΔiqComprises the following steps:
Δid＝Δiq＝(k1|ΔU/|α+k2|ΔU/|β)ΔU
wherein β is more than 1, 0 is more than α is less than 1, k1>0，k2>0, is a constant greater than 0, a, β, k1、k2Adjusting the voltage to be within an acceptable range of fluctuation of the intermediate direct current bus voltage according to actual conditions, wherein 50V is selected, β is reasonably obtained according to experiments of different load powers, β is selected to be 2.73, a is 0.84 according to actual debugging results of experimental sites, and k is adjusted to be within an acceptable range of fluctuation of the intermediate direct current bus voltage according to actual conditions1、k2The correction coefficients for the two compensation terms in the equation are fine adjustments for the two compensation terms, which are usually not selected too much, but too much selection results in the loss of | Δ U/. luminanceαAnd | Δ U/. mu.βThe original functions of the two, k is selected by the invention1＝k21. As can be seen from the above formula, when | Δ U->K, i.e. the range of the intermediate voltage fluctuation is greater than 50V2|ΔU/|βDominant, i.e. β dominant, id *、iq *The compensation force is large so as to adjust the fluctuation of the intermediate voltage to be less than 50V as soon as possible. When | Δ U |<Time, i.e. the intermediate voltage fluctuation is less than 50V, k1|ΔU/|αPlays a leading role, i.e. a plays a leading role, id *、iq *The compensation force is small, and the middle bus voltage is adjusted slowly. Thus, the auxiliary inversion can be performed in real timed *、iq *And compensation is adjusted, and the delta U is used as feedback of the auxiliary inversion control system, so that oscillation of the auxiliary converter control system can be well reduced. The problems of volume increase and efficiency reduction caused by changing main circuit parameters in the prior art are effectively solved.
Example 2
A high-power auxiliary converter comprises a thyristor rectification module, a direct-current bus filtering module and an inversion module, wherein a controller of an inverter in the inversion module adopts voltage and current double closed-loop control; the outer loop includes two PI regulators, PI1 and PI2, the inverter output voltage setpoint ud *And the collected value u of the output voltage of the inverterdAs input of PI1, inverter output voltage set value uq *And the collected value u of the output voltage of the inverterqAs input to PI 2; the inner loop also includes two PI regulators, PI3 and PI4, the inverter output current setpoint id *And the collection value i of the output current of the inverterdAs input of PI3, inverter output current set value iq *And the collection value i of the output current of the inverterqAs input to PI 4; the PI3 input also has Δ idThe input to PI4 is also Δ iq，
Δid＝Δiq＝(k1|ΔU/|α+k2|ΔU/|β)ΔU
Wherein β is more than 1, 0 is more than α is less than 1, k1>0，k2>0, is a constant greater than 0, a, β, k1、k2Adjusting according to the actual condition; delta U is the fluctuation value of the intermediate DC bus voltage, and is equal to Udc－Utd，UdcFor real-time sampled values of intermediate DC bus voltage, UtdThe real-time sampling value of the intermediate direct current bus voltage is a stable intermediate direct current bus voltage value obtained by filtering only the LC resonance frequency of the intermediate direct current bus filter inductance capacitor through a wave trap.

Claims (6)

1. A control method for high-power auxiliary converter, the inverter of said high-power auxiliary converter adopts voltage and current pairsClosed-loop control, characterized in that the fluctuations of the intermediate DC bus voltage are extracted for correcting the current loop set-point i of the inverter controld *、iq *So as to reduce the oscillation of the output voltage of the converter; the fluctuation value delta U of the intermediate DC bus voltage is equal to Udc－Utd，UdcFor real-time sampled values of intermediate DC bus voltage, UtdThe real-time sampling value of the intermediate direct current bus voltage is a stable intermediate direct current bus voltage value obtained by filtering only the LC resonance frequency of the intermediate direct current bus filter inductance capacitor through a wave trap; for correcting the current loop set value id *、iq *Correction value Δ i ofd、ΔiqComprises the following steps:
Δid＝Δiq＝(k1|ΔU/|α+k2|ΔU/|β)ΔU
wherein β is more than 1, 0 is more than α is less than 1, k1>0，k2>0, is a constant greater than 0, a, β, k1、k2And adjusting according to the actual condition.
2. A method for controlling a high power auxiliary converter according to claim 1, characterized in that for an acceptable range of intermediate dc bus voltage fluctuations, 50V is selected, β being a number less than 5.
3. The method for controlling the high power auxiliary inverter as claimed in claim 2, wherein β -2.73, a-0.84, k1＝k2＝1。
4. A high-power auxiliary converter comprises a thyristor rectification module, a direct-current bus filtering module and an inversion module, wherein a controller of an inverter in the inversion module adopts voltage and current double closed-loop control; the outer loop includes two PI regulators, PI1 and PI2, the inverter output voltage setpoint ud *And the collected value u of the output voltage of the inverterdAs input of PI1, inverter output voltage set value uq *And the collected value of the output voltage of the inverteruqAs input to PI 2; the inner loop also includes two PI regulators, PI3 and PI4, the inverter output current setpoint id *And the collection value i of the output current of the inverterdAs input of PI3, inverter output current set value iq *And the collection value i of the output current of the inverterqAs input to PI 4; characterised in that the input to PI3 is also Δ idThe input to PI4 is also Δ iq，
Δid＝Δiq＝(k1|ΔU/|α+k2|ΔU/|β)ΔU
Wherein β is more than 1, 0 is more than α is less than 1, k1>0，k2>0, is a constant greater than 0, a, β, k1、k2Adjusting according to the actual condition; delta U is the fluctuation value of the intermediate DC bus voltage, and is equal to Udc－Utd，UdcFor real-time sampled values of intermediate DC bus voltage, UtdThe real-time sampling value of the intermediate direct current bus voltage is a stable intermediate direct current bus voltage value obtained by filtering only the LC resonance frequency of the intermediate direct current bus filter inductance capacitor through a wave trap.
5. The high power auxiliary converter according to claim 4, wherein 50V is selected for an acceptable range of intermediate DC bus voltage ripple, and β is a number less than 5.
6. The high power auxiliary converter according to claim 5, wherein β -2.73, a-0.84, k1＝k2＝1。
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JP5300028B2 (en) * 2010-12-28 2013-09-25 オリジン電気株式会社 Single-phase voltage type AC / DC converter and system interconnection system
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CN104092239B (en) * 2014-06-25 2017-02-15 国家电网公司 Photovoltaic grid-connected control method based on modular multilevel converter
CN105006828B (en) * 2015-07-28 2018-04-13 南京工程学院 A kind of grid-connected converter negative-sequence current compensation method
CN105743367A (en) * 2016-04-15 2016-07-06 中国矿业大学 Dead beat control method of pulse width modulation (PWM) rectifier under unbalanced power grid voltage
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