CN109510223A - A kind of three-phase current unbalance administers controller, device and control method - Google Patents
A kind of three-phase current unbalance administers controller, device and control method Download PDFInfo
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- CN109510223A CN109510223A CN201811533806.1A CN201811533806A CN109510223A CN 109510223 A CN109510223 A CN 109510223A CN 201811533806 A CN201811533806 A CN 201811533806A CN 109510223 A CN109510223 A CN 109510223A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses a kind of three-phase current unbalances to administer controller, device and control method, comprising: dsp processor, UI sampling module, IGBT drive module；The dsp processor is connect with UI sampling module and IGBT drive module respectively；The voltage and current signal of UI sampling module acquisition setting is simultaneously sent into dsp processor, dsp processor generates the PWM modulation wave of control IGBT according to the voltage and current signal received, PWM modulation wave is fed to IGBT drive module, carries out power amplification, drives corresponding IGBT.The invention has the advantages that: the present apparatus by carrying out sample detecting to three-phase current on bus automatically, the case where three-phase current unbalance can be quickly detected, and continuous, smooth, quick adjusting is carried out to it, the problem of efficiently solving distribution low-pressure side generally existing three-phase current unbalance, it is highly reliable, it is intelligent high, it is easy to use, the needs of practical application can be met.
Description
Technical field
The present invention relates to three-phase current unbalance Treatment process fields in low-voltage network, more particularly to a kind of three-phase electricity
Stream is uneven to administer controller, device and control method.
Background technique
Since low-voltage distribution system user side is nearly all single-phase load, and electricity consumption has asynchronism, distribution transforming system pole
Easily there is three-phase current unbalance, there are negative phase-sequence and zero-sequence current, system power degrees of unbalancedness to severely exceed for system power.Due to
Low-voltage distribution system radius of electricity supply is long, works as three-phase current unbalance, be easy to cause power supply terminal voltage is low and Voltage unbalance
Problem influences user's use.In addition the three-phase current unbalance of distribution transformer, the phase overload for causing distribution transformer to have,
Some phase undercapacities cause distribution transformer fever serious, reduce the distribution transforming service life, or even burn distribution transforming.
Three-phase imbalance compensation device is administered main by the way of phase-change switch at present, is adjusted and is loaded using phase-change switch
Place mutually achievees the purpose that three-phase balance, but phase-change switch is unable to continuously smooth and quickly to three-phase imbalance electricity
Stream is adjusted.It can be realized the relation technological researching of continuous, smooth, quick adjusting three phase unbalance current simultaneously at present also very
It is few.
Summary of the invention
The purpose of the present invention is to solve the above-mentioned problems, proposes that a kind of three-phase current unbalance administers controller, dress
Set and control method, can be realized it is continuous, smooth, quickly adjust three phase unbalance current, eliminate negative in low-voltage distribution system
Sequence and zero-sequence current.
To achieve the goals above, the application adopts the following technical scheme that
A kind of three-phase current unbalance improvement controller disclosed in one or more embodiments, comprising: processor,
Sampling module, IGBT drive module；The processor is connect with sampling module and IGBT drive module respectively；
The voltage and current signal of sampling module acquisition setting is simultaneously sent into processor, and processor is according to the voltage and current received
Signal generates the modulating wave of control IGBT, and modulating wave is fed to IGBT drive module, carries out power amplification, and driving is corresponding
IGBT。
Further, the IGBT drive module acquires IGBT short-circuit signal and is sent into processor.
Further, further includes: single-chip microcontroller, key display module and communication module, key display module and communication mould
Block is connect with single-chip microcontroller respectively, and PERCOM peripheral communication and key information are fed back to processor by single-chip microcontroller.
A kind of three-phase current unbalance controlling device disclosed in one or more embodiments, comprising: above-mentioned three
Phase current imbalance administers controller, converter module, LCL filter unit, breaker and load-side current transformer；
Uneven controlling device accesses step down side by breaker；Breaker, LCL filter unit and inverter power
Unit is sequentially connected in series, and LCL filter unit and converter module are separately connected three-phase current unbalance and administer controller；It is negative
Carry side current transformer once flanks load access low-pressure side, and secondary side connects three-phase current unbalance and administers controller.
Further, the capacitor electricity of the sampling module acquisition DC bus-bar voltage, load-side electric current, LCL filter unit
Pressure exports electric current and crosses stream information.
Further, the three-phase current unbalance administers controller and carries out locking phase generation to the ac bus voltage of input
Electric network voltage phase θ and angular velocity omega, load-side electric current are decomposed into base by broad sense second-order integrator and positive-negative sequence decomposition algorithm
Wave positive-sequence component, fundamental wave negative sequence component and fundamental wave zero sequence component；It is idle that fundamental positive sequence decomposition transform is obtained into fundamental positive sequence
Component generates current-order, current-order according to the sum of fundamental positive sequence reactive component, fundamental wave negative sequence component and fundamental wave zero sequence component
PWM wave is generated through closed loop control algorithm, PWM wave drives IGBT.
A kind of control method of three-phase current unbalance controlling device disclosed in one or more embodiments, packet
It includes: the voltage control method of stable DC bus and the current control method using double-current ring；
The current control method specifically: PI controller is embedded into repetitive controller, constitutes dual-loop controller；PI
Controller is as inner ring, and repetitive controller is as outer ring；Repetitive controller need only be repaired on the basis of PI controller error
Just.
Further, the voltage control method of the stable DC bus specifically:
The difference of busbar voltage setting value and bus capacitor voltage sample value is obtained to stablize bus electricity after PI operation
The watt current of pressure instructs；
The difference of upper bridge arm bus capacitor voltage sample value and lower bridge arm bus capacitor voltage sample value is passed through into PI operation
After obtain positive and negative busbar and press instruction.
Further, further includes: voltage feed-forward control control, specifically:
By using double-current ring current control after ABC three-phase output respectively with ABC three-phase power grid voltage sampled value
The modulated signal of PWM wave is obtained after making the difference, and then generates corresponding PWM wave driving IGBT to complete the improvement of out-of-balance current.
Compared with prior art, the beneficial effects of the present invention are:
The present apparatus can quickly detect three-phase current injustice by carrying out sample detecting to three-phase current on bus automatically
The case where weighing apparatus, and continuous, smooth, quick adjusting is carried out to it, efficiently solve the generally existing three-phase electricity of distribution low-pressure side
Unbalanced problem is flowed, highly reliable, intelligence is high, is easy to use, can meet the needs of practical application.
In current regulator, PI controller is embedded into repetitive controller, constitutes dual-loop controller.PI controller conduct
Inner ring, using its fast-response, to improve system dynamic responding speed；Repetitive controller utilizes its disturbance rejection as outer ring
Property, to improve the stable state accuracy of system.Meanwhile repetitive controller need only be corrected on the basis of PI error, therefore regulating time
It greatly reduces.The fast-response of control system had not only been met in this way, but also improved the tracking accuracy of system.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is uneven controlling device controller topological diagram；
Fig. 2 is uneven controlling device topological diagram；
Fig. 3 is that uneven controlling device current-order extracts block diagram；
Fig. 4 is uneven controlling device control block diagram；
Fig. 5 is double-current ring control block diagram.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
In one or more embodiment, a kind of controller for uneven controlling device is disclosed, such as Fig. 1 institute
Show, comprising: dsp processor, UI sampling module, IGBT drive module, STM32 single-chip microcontroller, key display module and communication module.
UI sampling module is connect with dsp processor, dsp processor and dsp processor two-way communication.
UI sampling module acquires DC bus-bar voltage, load-side electric current, the capacitance voltage of LCL filter module, output electric current
Equal signals carry out processing and processing signal are sent into dsp processor AD mouthfuls.In addition, UI sampling module judges according to the information of acquisition
Whether overcurrent, and generate corresponding marking signal and be sent into dsp processor.
Dsp processor is by sample and by the PWM of certain algorithm generation control IGBT to voltage and current signal
Modulating wave, PWM modulation wave are fed to IGBT drive module, and in addition dsp processor is responsible for acquiring various protection signals.IGBT drives
Dynamic model block carries out power amplification to pwm signal and drives IGBT, while being handled IGBT short circuit and generating corresponding signal feeding
DSP。
Data exchange is carried out by RS485 between STM32 single-chip microcontroller and DSP, the information such as processing PERCOM peripheral communication, key are simultaneously anti-
It feeds dsp processor.STM32 single-chip microcontroller and key display module and communication module carry out two-way communication respectively.
Communication module includes RS232 and CAN communication two ways, responsible and communication with external apparatus.
Key display module processing actuation of keys and the operating status etc. for showing uneven controlling device, are human-computer interaction bases
Plinth.
Embodiment two
In one or more embodiment, a kind of three-phase imbalance controlling device is disclosed, as shown in Figure 2, comprising: real
It applies controller described in example one, converter module, LCL filter unit, breaker and load and surveys power transformer；Breaker,
LCL filter unit and converter module are sequentially connected in series, and LCL filter unit and converter module are separately connected control
Device；Load-side current transformer once flanks load access 400V bus bar side, and secondary side connects controller.
Uneven controlling device accesses transformer 400V low-pressure side by breaker；The primary side of load-side current transformer
Load access 400V low-pressure side is connect, it is secondary to flank control unit；Controller realizes three-phase current by control converter module
Imbalance is administered and related protection；LCL filter unit is filtered converter module output, improves grid-connected current matter
Amount；Converter module is unbalancing device power cell, is realized using NPC three-level topology structure.
Embodiment three
In one or more embodiment, a kind of control method of three-phase imbalance controlling device is disclosed.It is uneven
Controlling device control generates corresponding current-order by certain algorithm, and current-order generates PWM wave through closed loop control algorithm,
PWM wave drives IGBT to complete the improvement of out-of-balance current.Current-order generates control algolithm as shown in figure 3, DSP locking phase first
Module carries out locking phase to the ac bus voltage of input and generates electric network voltage phase θ and angular velocity omega, and load current passes through broad sense
Second-order integrator and positive-negative sequence decomposition algorithm are decomposed into fundamental positive sequence ix+, negative sequence component ix- and zero-sequence component iz (its
Middle x represents abc three-phase).Fundamental positive sequence is decomposed into id+ and iq+ component by C32 and C transformation, and enabling id+ is zero, iq+
Fundamental positive sequence reactive component ixq can be obtained after 32 inverse transformation of C ' and C ' (wherein x represents abc three-phase).Instruction current is fundamental wave
The sum of positive sequence reactive component, negative sequence component and zero-sequence component.
Uneven controlling device control loop uses Double-loop Control Strategy, and outer ring is the Voltage loop of stable DC bus, interior
Ring is electric current loop, and inner ring uses double-current ring Direct Current Control Strategy.Wherein outer ring includes bus capacitor regulation loop and positive and negative
Bus capacitor grading ring.To improve grid-connected current quality, voltage feed-forward control control is added, is specifically shown in Fig. 4.
In Fig. 4, Udref* is busbar voltage setting value；Udc is bus capacitor voltage sample value；Udc+ is upper bridge arm bus
Capacitance voltage sampled value；Id* stablizes the watt current instruction of busbar voltage；In* is that positive and negative busbar presses instruction；
Iaref, Ibref, Icref are the instruction of ABC phase control；Ia, lb, lc are to administer unbalancing device ABC phase to export electricity
Flow sampled value；Ua, Ub, Uc are ABC phase line voltage sampled value；Iao*, Ibo*, Ico* are the output of ABC phase dual-loop controller；
Sina, sinb, sinc are modulated signal；
The difference of busbar voltage setting value and bus capacitor voltage sample value is obtained to stablize bus electricity after PI operation
The watt current of pressure instructs；
The difference of upper bridge arm bus capacitor voltage sample value and lower bridge arm bus capacitor voltage sample value is passed through into PI operation
After obtain positive and negative busbar and press instruction.
Two instructions obtained above obtain three-phase output electric current by dq/abc coordinate transform, and three-phase exports electric current difference
After the addition of three-phase instruction current, obtained three-phase current makes the difference with the three-phase of device output electric current respectively, and difference is sent into double electricity
Stream ring respectively obtains the output of ABC three-phase dual-loop controller after being handled；
By using double-current ring current control after ABC three-phase dual-loop controller output respectively with ABC three phase network
Voltage sample value obtains the modulated signal of PWM wave after making the difference, and then generates corresponding PWM wave driving IGBT to complete uneven electricity
The improvement of stream.
To improve grid-connected current quality, electric current loop controls double-current ring control strategy using Repetitive controller+PI, such as Fig. 5 institute
Show, PI controller is embedded into repetitive controller, constitutes dual-loop controller.PI controller utilizes it as adjuster inner ring
Fast-response improves system dynamic responding speed；Repetitive controller is as outer ring, using its disturbance rejection, to periodic signal
Good tracking characteristics improve the stable state accuracy of system.Repetitive controller need only be corrected on the basis of PI error, therefore when adjusting
Between greatly reduce.The fast-response of control system had not only been met in this way, but also improved the tracking accuracy of system.Work as tracking object
When mutation, PI controller plays a major role, and Repetitive controller is exported by limit value, and system response time is fast, when tracking object becomes
When stablizing, Repetitive controller and PI control collective effect, improve systematic steady state precision.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (9)
1. a kind of three-phase current unbalance administers controller characterized by comprising processor, sampling module, IGBT drive mould
Block；The processor is connect with sampling module and IGBT drive module respectively；
The voltage and current signal of sampling module acquisition setting is simultaneously sent into processor, and processor is according to the voltage and current signal received
The modulating wave of control IGBT is generated, modulating wave is fed to IGBT drive module, carries out power amplification, drives corresponding IGBT.
2. a kind of three-phase current unbalance as described in claim 1 administers controller, which is characterized in that the IGBT drives mould
Block acquisition IGBT short-circuit signal is simultaneously sent into processor.
3. a kind of three-phase current unbalance as described in claim 1 administers controller, which is characterized in that further include: single-chip microcontroller,
Key display module and communication module, key display module and communication module are connect with single-chip microcontroller respectively, and single-chip microcontroller will be external
Communication and key information feed back to processor.
4. a kind of three-phase current unbalance controlling device characterized by comprising the described in any item three-phases of claim 1-3
Current imbalance administers controller, converter module, LCL filter unit, breaker and load-side current transformer；
Uneven controlling device accesses step down side by breaker；Breaker, LCL filter unit and converter module
It is sequentially connected in series, LCL filter unit and converter module are separately connected three-phase current unbalance and administer controller；Load-side
Current transformer once flanks load access low-pressure side, and secondary side connects three-phase current unbalance and administers controller.
5. a kind of three-phase current unbalance controlling device as claimed in claim 4, which is characterized in that the sampling module acquisition
DC bus-bar voltage, load-side electric current, the capacitance voltage of LCL filter unit, output electric current and mistake stream information.
6. a kind of three-phase current unbalance controlling device as claimed in claim 4, which is characterized in that the three-phase current is uneven
Weighing apparatus administers controller and carries out locking phase generation electric network voltage phase θ and angular velocity omega, load-side electricity to the ac bus voltage of input
Stream is decomposed into fundamental positive sequence, fundamental wave negative sequence component and fundamental wave zero sequence by broad sense second-order integrator and positive-negative sequence decomposition algorithm
Component；Fundamental positive sequence decomposition transform is obtained into fundamental positive sequence reactive component, according to fundamental positive sequence reactive component, fundamental wave negative sequence
The sum of component and fundamental wave zero sequence component generate current-order, and current-order generates PWM wave, PWM wave driving through closed loop control algorithm
IGBT。
7. a kind of control method of three-phase current unbalance controlling device characterized by comprising the voltage of stable DC bus
Control method and the current control method for using double-current ring；
The current control method specifically: PI controller is embedded into repetitive controller, constitutes dual-loop controller；PI control
Device is as inner ring, and repetitive controller is as outer ring；Repetitive controller need only be modified on the basis of PI controller error.
8. a kind of control method of three-phase current unbalance controlling device as described in claim 1, which is characterized in that described steady
Determine the voltage control method of DC bus specifically:
It obtains the difference of busbar voltage setting value and bus capacitor voltage sample value to stablize busbar voltage after PI operation
Watt current instruction；
By the difference of upper bridge arm bus capacitor voltage sample value and lower bridge arm bus capacitor voltage sample value after PI operation
Instruction is pressed to positive and negative busbar.
9. a kind of control method of three-phase current unbalance controlling device as described in claim 1, which is characterized in that also wrap
It includes: voltage feed-forward control control, specifically:
The output of ABC three-phase makes the difference with ABC three-phase power grid voltage sampled value respectively after the current control using double-current ring
The modulated signal of PWM wave is obtained afterwards, and then generates corresponding PWM wave driving IGBT to complete the improvement of out-of-balance current.
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Cited By (4)
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| CN111049156A (en) * | 2019-12-31 | 2020-04-21 | 武汉欣和开元电子有限公司 | Novel reactive power and unbalance compensation control method |
| CN111404190A (en) * | 2020-04-19 | 2020-07-10 | 中国电建集团华东勘测设计研究院有限公司 | Control method and system for enhancing power output capability of MMC converter station under power grid fault |
| CN111884238A (en) * | 2020-08-05 | 2020-11-03 | 西安西变组件有限公司 | Electric energy quality treatment device of low-voltage distribution network |
| CN112332445A (en) * | 2020-09-29 | 2021-02-05 | 广西大学 | LCL grid-connected inverter indirect current control method based on instruction current compensation |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049156A (en) * | 2019-12-31 | 2020-04-21 | 武汉欣和开元电子有限公司 | Novel reactive power and unbalance compensation control method |
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| CN111404190B (en) * | 2020-04-19 | 2021-09-03 | 中国电建集团华东勘测设计研究院有限公司 | Control method and system for enhancing power output capability of MMC converter station under power grid fault |
| CN111884238A (en) * | 2020-08-05 | 2020-11-03 | 西安西变组件有限公司 | Electric energy quality treatment device of low-voltage distribution network |
| CN112332445A (en) * | 2020-09-29 | 2021-02-05 | 广西大学 | LCL grid-connected inverter indirect current control method based on instruction current compensation |
| CN112332445B (en) * | 2020-09-29 | 2022-11-18 | 广西大学 | LCL grid-connected inverter indirect current control method based on instruction current compensation |
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Address after: 250101 Electric Power Intelligent Robot Production Project 101 in Jinan City, Shandong Province, South of Feiyue Avenue and East of No. 26 Road (ICT Industrial Park) Applicant after: National Network Intelligent Technology Co., Ltd. Address before: 250101 block B, Yinhe building, 2008 Xinjie street, hi tech Zone, Ji'nan, Shandong. Applicant before: Shandong Luneng Intelligent Technology Co., Ltd. |
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Application publication date: 20190322 |