CN109194122A - A method of inhibit DC/DC power inverter front voltage to fluctuate using Repetitive controller - Google Patents
A method of inhibit DC/DC power inverter front voltage to fluctuate using Repetitive controller Download PDFInfo
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- CN109194122A CN109194122A CN201811236865.2A CN201811236865A CN109194122A CN 109194122 A CN109194122 A CN 109194122A CN 201811236865 A CN201811236865 A CN 201811236865A CN 109194122 A CN109194122 A CN 109194122A
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- voltage
- boost
- repetitive controller
- controller
- rpfc
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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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
本发明提供的是一种利用重复控制抑制DC/DC功率变换器前端电压波动的方法，属于电力电子技术领域。该方法针对前端采用三相二极管整流提供直流电压的DC/DC变换器。在此条件下，整流后的直流电压可存在6fac的交流纹波电压，视整流滤波电容容量大小以及后级功率变换器负载大小，较大幅值的纹波电压可能影响到后级功率变换器输出电压的质量。因此本专利利用软件锁相环锁定交流电压的频率fac，并利用高通滤波器提取整流电压中的6fac纹波电压分量，将其输入针对6fac频率信号抑制的重复控制器中，将该重复控制器输出信号融入到后级功率变换器的控制系统中达到减小整流直流电压中的6fac电压波动对后级功率变换器输出电压质量负面影响的目的。
The invention provides a method for suppressing voltage fluctuation at the front end of a DC/DC power converter by using repeated control, which belongs to the technical field of power electronics. The method is aimed at a DC/DC converter whose front end adopts three-phase diode rectification to provide a DC voltage. Under this condition, the rectified DC voltage can have an AC ripple voltage of 6f ac . Depending on the capacity of the rectifier filter capacitor and the load of the power converter at the rear stage, a larger ripple voltage may affect the power converter at the rear stage. quality of the output voltage. Therefore, this patent uses a software phase-locked loop to lock the frequency f ac of the AC voltage, and uses a high-pass filter to extract the 6f ac ripple voltage component in the rectified voltage, and input it into the repetitive controller for 6f ac frequency signal suppression. The output signal of the repetitive controller is integrated into the control system of the power converter of the latter stage to reduce the negative influence of the 6f ac voltage fluctuation in the rectified DC voltage on the quality of the output voltage of the power converter of the latter stage.
Description
Technical field
The invention belongs to power electronics fields, and in particular to a kind of to inhibit DC/DC power conversion using Repetitive controller
Device front end direct current voltage cycle fluctuates the method negatively affected to rear class converter output voltage quality.
Background technique
DC/DC converter is switching power source chip, refers to the characteristic of the energy storage using capacitor, inductance, passes through controllable switch
(MOSFET etc.) carries out the movement of HF switch, and the electric energy of input is stored in capacitor (sense) is inner, and when the switches are opened, electric energy is again
It is released to load, energy is provided.The ability and duty ratio of its power exported or voltage are (by switch conduction times and entire switch
Period ratio) it is related.Switching Power Supply can be used for boosting and being depressured.DC/DC converter is divided into three classes: step-up DC/DC
Converter, voltage-dropping type DC/DC converter and buck-boost type DC/DC converter.Three classes control can be used according to demand.
The DC/DC converter of DC voltage is provided using three-phase diode rectification for front end, with this condition, through three-phase
6f may be present in DC voltage after diode rectificationacAC ripple voltage.From the angle analysis of rear class converter mathematical model,
It is big depending on rectifying and wave-filtering capacitance due to there are the transmission function relationship of its front end direct current busbar voltage to its output voltage
Small and rear class power inverter payload size, the ripple voltage of higher magnitude may influence rear class power inverter output electricity
The quality (same frequency voltage ripple is caused to fluctuate in output voltage) of pressure.Method provided by the present invention to a certain extent can be with
Improve the above problem.
Summary of the invention
The present invention is to provide it is a kind of using Repetitive controller inhibit DC/DC power inverter front voltage fluctuation method,
Purpose is the DC/DC converter for front end using three-phase diode rectification offer DC voltage, to a certain extent significantly
Reduce influence of the fluctuation of rear class DC/DC converter front end direct current voltage to DC/DC converter output voltage, reaches improvement rear class
The purpose of power inverter output voltage quality.
The object of the present invention is achieved like this:
Come for cascading Boost in conjunction with three-phase diode rectifier (REC) in attached drawing 1 to side provided by the invention
Method is illustrated.As shown in Fig. 1, ex(x=a, b, c) is respectively three-phase alternating voltage, Lx(x=a, b, c) is respectively three-phase
Equivalent series inductance, Rx(x=a, b, c) is respectively the equivalent series resistance of three-phase.
Three-phase voltage is rectified through REC, and through DC bus capacitor CdcDC voltage v is obtained after filteringdc.Boost is made
For the rear class of rectifier output, by closed-loop control by vdcIt is transformed to required output voltage vo.Boost topology itself
For mature technology, details are not described herein.
Boost itself uses traditional Double closed-loop of voltage and current structure (DLC), by voltage control outer ring
Setting signal vrefWith output voltage voDeviation be sent into voltage controller Gv, the command signal of current inner loop is obtained after operation
iref.By irefWith the inductive current i of BoostLDifference be sent into current controller Gi, control amount v is obtained after operationcc。
By vccWith the output v of the feed-forward compensator (RPFC) based on Repetitive controllerffcIt is overlapped to obtain final control amount to be vc, by vc
The drive pulse signal that duty ratio is d, the letter are obtained after being sent into modulator link (1/VM) (amplitude that VM is modulator carrier wave)
Control number for Boost switching tube VT in attached drawing 1.
In RPFC, DC voltage v is extracted first with high-pass filter HPFdcIn 6 times of ac power frequency components
vffAs the input signal of repetitive controller RPC in RPFC, by the output signal v of RPFC after operationffcBelieve as feedforward compensation
Control signal v number with DLC linkcSuperposition.
RPC sheet is as mature technology in figure, and details are not described herein for concrete principle.Its parameter is slightly illustrated, it is assumed that switch
Frequency is fs, ac power frequency fac, then the N=f in RPCs/(6fac), KrFor the gain of repetitive controller, zkFor time delay benefit
Link is repaid, for compensation system sampling and the time delay of forward path, S is a low-pass filter, for inhibiting the height of system
Band noise, Q are a low-pass filter, can be used for improving the stability of RPC, it is practical in, Q can use one close to 1
Constant, such as 0.95.
Attached drawing 2 show the control block diagram of single-phase software phase-lock loop, itself is mature technology, and principle is no longer superfluous herein
It states.Its purpose is to obtain the frequency f of AC power sourceac, and then according to N=fs/(6fac) determine the numerical value of N in RPC, to reach
To when ac power frequency changes to vdcThe purpose that vibration frequency component inhibits.It should be noted that three-phase shown in corresponding diagram 1
AC power source, the voltage e of any one phasex(x=a, b, c) can be used as the u in attached drawing 2αComponent.GpiFor for phaselocked loop control
The pi regulator of system.
Compared with prior art, present invention has an advantage that
1. locking ac power frequency by using software phase-lock loop, method used by can making has good frequency
Rate adaptability, i.e., when the frequency of AC power source changes, used feedforward compensation method still has good compensation
Effect；
2. can be better achieved and be disturbed to specific frequency components using the output of repetitive controller as Front Feed Compensation
Signal compensation effect.
Detailed description of the invention
Fig. 1 is the main circuit and control structure schematic diagram of power inverter.
Fig. 2 is single-phase software phase-lock loop.
Fig. 3 is the execution process of method provided by the invention.
Specific embodiment
With reference to the accompanying drawing 3, a kind of inhibit DC/DC power inverter front end electricity using Repetitive controller to of the present invention
The design and implementation process description of the method for pressure fluctuation negative effect is as follows.
(1) double closed-loop control system of Boost is designed according to Boost device parameters and transmission function,
Respectively obtain GvAnd Gi。
(2) range changed according to ac power frequency, the high-pass filter HPF of design suitable frequency characteristic is for extracting
vdcIn 6 frequency multiplication ac power frequency components.
(3) repetitive controller in RPFC link is designed, determines Kr, zk, S and Q.
(4) single-phase software phase-lock loop is designed, determines pi regulator GpiParameter.
(5) in the ready situation of AC power source, runs software phaselocked loop first obtains the frequency f of AC power sourceac, in turn
Obtain N=fs/(6fac).If ac power frequency changes, which can constantly be refreshed in entire control process.
(6) it is separately operable Boost voltage and current double-closed-loop control program, obtains control amount vcc。
(7) program for running RPFC link, obtains Front Feed Compensation vffc。
(8) by vccWith vffcSuperposition, obtains the final control amount v of Boostc。
(9) by vcIt obtains being d, pulse letter for the duty ratio of Boost switch controlled for PWM modulation
Number.
(10) if not reaching desired control effect, corresponding design procedure in (1)-(9) is returned to, until being expired
The actual result of meaning.
Claims (4)
1. a kind of method for inhibiting the fluctuation of DC/DC power inverter front voltage using Repetitive controller, it is characterised in that: step is such as
Under:
(1) double closed-loop control system (DLC) of Boost is designed according to Boost device parameters and transmission function,
Respectively obtain voltage controller GvWith current controller Gi；
(2) range changed according to ac power frequency, the high-pass filter HPF of design suitable frequency characteristic is for extracting direct current
Voltage vdcIn 6 frequency multiplication ac power frequency components；
(3) repetitive controller in feed-forward compensator (RPFC) link is designed, determines the gain K of repetitive controllerr, delay compensation
Link zk, low-pass filter S and low-pass filter Q；
(4) single-phase software phase-lock loop is designed, determines pi regulator GpiParameter；
(5) in the ready situation of AC power source, runs software phaselocked loop first obtains the frequency f of AC power sourceac, and then obtain N
=fs/(6fac)；
(6) it is separately operable Boost voltage and current double-closed-loop control program, obtains control amount vcc；
(7) program for running RPFC link, obtains Front Feed Compensation vffc；
(8) by vccWith vffcSuperposition, obtains the final control amount v of Boostc；
(9) by vcIt obtains for the duty ratio of Boost switch controlled being d, pulse signal for PWM modulation；
(10) if not reaching desired control effect, corresponding design procedure in (1)-(9) is returned to, until obtaining satisfaction
Actual result.
2. a kind of side for inhibiting the fluctuation of DC/DC power inverter front voltage using Repetitive controller according to claim 1
Method, it is characterised in that: the value that the low-pass filter Q is used is 0.95.
3. a kind of side for inhibiting the fluctuation of DC/DC power inverter front voltage using Repetitive controller according to claim 1
Method, it is characterised in that: the Boost calculating process is as follows:
By the Setting signal v of voltage control outer ringrefWith output voltage voDeviation be sent into voltage controller Gv, obtained after operation
The command signal i of current inner loopref；By irefWith the inductive current i of BoostLDifference be sent into current controller Gi, through transporting
Control amount v is obtained after calculationcc；By vccWith the output v of the feed-forward compensator (RPFC) based on Repetitive controllerffcIt is overlapped to obtain most
Whole control amount is vc, by vcThe drive that duty ratio is d is obtained after being sent into modulator link (1/VM) (amplitude that VM is modulator carrier wave)
Moving pulse signal, the control for Boost switching tube VT.
4. a kind of side for inhibiting the fluctuation of DC/DC power inverter front voltage using Repetitive controller according to claim 1
Method, it is characterised in that: described feed-forward compensator (RPFC) the link calculating process is as follows:
DC voltage v is extracted first with high-pass filter HPFdcIn 6 times of ac power frequency component vffAs weight in RPFC
The input signal of multiple controller RPC, by the output signal v of RPFC after operationffcAs feedforward compensation signal and DLC link
Control signal vcSuperposition.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811236865.2A CN109194122A (en) | 2018-10-23 | 2018-10-23 | A method of inhibit DC/DC power inverter front voltage to fluctuate using Repetitive controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811236865.2A CN109194122A (en) | 2018-10-23 | 2018-10-23 | A method of inhibit DC/DC power inverter front voltage to fluctuate using Repetitive controller |
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| CN109194122A true CN109194122A (en) | 2019-01-11 |
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| CN201811236865.2A Pending CN109194122A (en) | 2018-10-23 | 2018-10-23 | A method of inhibit DC/DC power inverter front voltage to fluctuate using Repetitive controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112636585A (en) * | 2020-12-11 | 2021-04-09 | 中国电子科技集团公司第十四研究所 | Power fluctuation suppression system and design method thereof |
| ES2950989A1 (en) * | 2023-07-14 | 2023-10-17 | Univ Madrid Politecnica | Method and system for estimating the frequency of an alternating current electrical network that feeds a direct current railway electrical system |
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| CN102882211A (en) * | 2012-10-15 | 2013-01-16 | 北京京仪椿树整流器有限责任公司 | Self-adaptive repetitive control method for active power filter |
| CN103190068A (en) * | 2010-11-05 | 2013-07-03 | 三菱电机株式会社 | Power converter |
| CN103516249A (en) * | 2013-10-15 | 2014-01-15 | 哈尔滨工程大学 | Single-phase inverter and waveform control method thereof |
| CN106169868A (en) * | 2016-09-23 | 2016-11-30 | 华北电力大学（保定） | The DC converter topology of wide input and feed-forward type Average Current Control method thereof |
| CN108631603A (en) * | 2018-05-25 | 2018-10-09 | 哈尔滨工程大学 | A kind of control method that the DC bus-bar voltage oscillation based on full-bridge converter inhibits |
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Patent Citations (5)
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| CN103190068A (en) * | 2010-11-05 | 2013-07-03 | 三菱电机株式会社 | Power converter |
| CN102882211A (en) * | 2012-10-15 | 2013-01-16 | 北京京仪椿树整流器有限责任公司 | Self-adaptive repetitive control method for active power filter |
| CN103516249A (en) * | 2013-10-15 | 2014-01-15 | 哈尔滨工程大学 | Single-phase inverter and waveform control method thereof |
| CN106169868A (en) * | 2016-09-23 | 2016-11-30 | 华北电力大学（保定） | The DC converter topology of wide input and feed-forward type Average Current Control method thereof |
| CN108631603A (en) * | 2018-05-25 | 2018-10-09 | 哈尔滨工程大学 | A kind of control method that the DC bus-bar voltage oscillation based on full-bridge converter inhibits |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112636585A (en) * | 2020-12-11 | 2021-04-09 | 中国电子科技集团公司第十四研究所 | Power fluctuation suppression system and design method thereof |
| ES2950989A1 (en) * | 2023-07-14 | 2023-10-17 | Univ Madrid Politecnica | Method and system for estimating the frequency of an alternating current electrical network that feeds a direct current railway electrical system |
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