CN108306317A - A kind of power distribution network transformer electric energy quality synthesis compensation apparatus and its method - Google Patents
A kind of power distribution network transformer electric energy quality synthesis compensation apparatus and its method Download PDFInfo
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Classifications
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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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- 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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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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
- Y02E40/30—Reactive power compensation
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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
- Y02E40/40—Arrangements for reducing harmonics
-
- 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
Abstract
The invention discloses a kind of power distribution network transformer electric energy quality synthesis compensation apparatus and methods, the present invention in distribution transformer high-pressure side or low-pressure side by installing full power convertor (VSC) and isolation series transformer, dynamic regulation output voltage and unbalance voltage, the out-of-balance current of load, harmonic current and realization reactive power compensation.The present invention is capable of the power quality problem of the generally existing of comprehensive treatment power distribution network, such as voltage and current imbalance, the problems such as harmonic current, reactive current, comprehensive a variety of traditional power quality controlling functions of the equipments and one, installation space and equipment input cost are reduced, there is good economic benefit.
Description
Technical field
The present invention relates to field of distribution network, and in particular to a kind of power distribution network transformer electric energy quality synthesis compensation apparatus and its
Method.
Background technology
There are a variety of power quality problems for industrial power distribution network transformer.User terminal uses single phase power supply, can cause three phase transformations
The voltage and current of depressor is uneven, due to the imbalance of voltage and current, can cause transformer loss increase and reduced lifetime.
Commercial Application three-phase electricity power supply occasion can influence if Voltage unbalance also will have a direct impact on power supply quality under serious situation
The operation of equipment.The equipment such as the user side of the transformer of power distribution network, motor and dragging will produce harmonic wave and idle, and harmonic wave leads to electricity
Pressure distortion and current distortion cause loss to increase and influence equipment operation, and idle that loss is caused to increase, power factor is lower.
Traditional power quality controlling equipment usually individually solves specific power quality problem, such as solves the problems, such as reactive-load compensation
(SVG) or individually harmonic problem (APF) is solved, power quality controlling generally requires great amount of investment, lacks comprehensive and economic solution
The certainly method and apparatus of power quality, the requirement with power distribution network to power quality is higher and higher, comprehensive and economic solution electric energy
The effect of the method and apparatus of quality is particularly important.
Invention content
To solve the above problems, the present invention provides a kind of power distribution network transformer electric energy quality synthesis compensation apparatus, the device
By installing full power convertor (VSC) and isolation series transformer, dynamic regulation in distribution transformer high-pressure side or low-pressure side
Output voltage and unbalance voltage, the out-of-balance current of load, harmonic current and realization reactive power compensation.
Preferably, the full power convertor includes：Series transformer in power distribution network transformer side is set, for solving
Voltage unbalance and voltage fluctuation problem；And the parallel connection converter in load-side is set, for solving current imbalance, harmonic wave
It administers and reactive-load compensation problem.
Preferably, the secondary side of the isolation series transformer is series between distribution transformer output and load, the string
Connection converter is connected to isolation series transformer primary side, and the parallel connection converter is in parallel with load-side.
To solve the above problems, the present invention also provides a kind of power distribution network transformer power quality comprehensive compensation method, the party
Method in distribution transformer high-pressure side or low-pressure side by installing equipment, dynamic regulation output voltage and unbalance voltage, load
Out-of-balance current, harmonic current and reactive power compensation, which is characterized in that the method is to pass through full power convertor
(VSC) and isolation series transformer is come what is realized, and the isolation series transformer is series at distribution transformer output and loads it
Between, the series transformer of the full power convertor is connected to isolation series transformer primary side, the parallel inverter of full power convertor
Device is in parallel with load-side, and the series transformer of the grid side is described for solving the problems, such as unbalance voltage and voltage fluctuation
The parallel connection converter of load-side is for solving the problems, such as out-of-balance current, reactive-load compensation and harmonic current.
Preferably, power distribution network transformer voltage imbalance and voltage fluctuation are solved the problems, such as, is specifically comprised the following steps：Detection
Distribution transformer terminal voltage, and the positive and negative order components by extracting voltage, control negative sequence voltage is 0, and control positive sequence voltage is
Rated value solves the problems, such as imbalance and the voltage fluctuation of voltage.
Preferably, solve the problems, such as that load-side current imbalance specifically comprises the following steps：Detect the electric current of load-side, extraction
The positive and negative order components of electric current, control negative-sequence current is 0, solves the imbalance problem of electric current.
Preferably, solve the problems, such as that Power Distribution Network Reactive Power Compensation specifically comprises the following steps：Detect the voltage of transformer terminal
Electric current is 1 by dynamic compensating reactive power current control power factor of electric network, in real time, linearly solves the problems, such as reactive-load compensation.
Preferably, power distribution network transformer harmonic problem is solved to specifically comprise the following steps：The voltage for detecting load end, passes through
PLL phaselocked loops obtain locking phase, and the electric current by detecting load-side, extract harmonic current components, control harmonic current
It is 0, realizes the harmonic wave control of electric current.
Preferably, series transformer closed-loop control solves the problems, such as Voltage unbalance and power-supply fluctuation, real as follows
It is existing：
(1) grid phase θ is obtained by phase-locked loop plls；
(2) the positive and negative order components for extracting voltage carry out abc/dq transformation to negative sequence component, obtain the dq values of negative sequence component,
The dq given values of negative sequence component are all 0, carry out closed-loop control respectively on dq axis, and as needed, controller can be PI controls
Device can also be other kinds of controller.
Preferably, parallel connection converter closed-loop control solves current imbalance and harmonic problem, is achieved by the steps of：
(1) grid phase θ is obtained by phase-locked loop plls；
(2) the positive and negative order components of load current are extracted, abc/dq transformation is carried out to negative sequence component, obtains the dq of negative sequence component
Value, the dq given values of negative sequence component are all 0, carry out closed-loop control respectively on dq axis, and as needed, controller can be PI controls
Device processed can also be other kinds of controller；
(3) corresponding abc/dq transformation is carried out by extracting each harmonic component, obtains the dq values of individual harmonic current,
The dq given values of harmonic component are all 0, carry out closed-loop control respectively on dq axis, and as needed, controller can be PI controls
Device can also be other kinds of controller；
(4) power distribution network transformer voltage and electric current are acquired, power factor is calculated, is 1 progress by given power factor
Closed-loop control is realized and adjusts reactive component in real time, and controller can be PI controllers, can also be other kinds of controller.
(5) in order to improve the stability and dynamic response performance of converter, electric current loop is added.The voltage that electric current loop comes out
Instruction, corresponding pwm signal is obtained by the modulation of SVPWM, and corresponding IGBT module is driven by the way that amplification is isolated.
The invention has the advantages that：
(1) the present invention provides a kind of solution power distribution network transformer power quality harnessed synthetically scheme, pass through power grid transformation
Device series transformer solves the problems, such as Voltage unbalance and reactive-load compensation, and current imbalance harmony is solved by loading parallel connection converter
Wave problem, can to distribution voltage and current imbalance, harmonic wave control, reactive-load compensation comprehensive compensation, reduce power quality controlling
Input cost；
(2) present invention crosses detection transformer terminal or load terminal voltage electric current, by the positive and negative order components for adjusting voltage and current
The adaptive balance control for realizing voltage, has compared with hard real-time and robustness；
(3) present invention passes through dynamic compensating reactive power current control grid power by the voltage and current of detection transformer terminal
Factor in real time, linearly solves the problems, such as idle.
(4) present invention extracts harmonic current components, control harmonic current is 0, to specific by the electric current of detection load-side
The eradicating efficacy of harmonic wave is notable.
Description of the drawings
Fig. 1 shows a kind of concrete structure diagram of power distribution network transformer synthesis compensation device of the present invention.
Fig. 2 shows a kind of topological diagrams of power distribution network transformer synthesis compensation device of the present invention；
Fig. 3 shows a kind of control block diagram of power distribution network transformer synthesis compensation device of the present invention；
Specific implementation mode
Fig. 1 shows that a kind of concrete structure diagram of power distribution network transformer synthesis compensation device, the device include that isolation is connected
Transformer and full power convertor (VSC).
Series connection side structure is that isolation series transformer pair side is connected between power grid and load, and series transformer primary side is isolated
Connect full power convertor (VSC) series transformer.Side structure in parallel is that full power convertor (VSC) parallel connection converter is connected in parallel on
Load-side.Power distribution network transformer side series transformer is for solving the problems, such as that Voltage unbalance and voltage fluctuation, load-side parallel connection become
Parallel operation is for solving current imbalance, reactive-load compensation and harmonic wave governing problem.
Fig. 2 shows a kind of topological diagrams of power distribution network transformer synthesis compensation device of the present invention, give power distribution network change
The specific implementation mode that depressor voltage and current imbalance, harmonic wave control, reactive power compensation integrated compensation control.Connect side structure be every
It is connected between power grid and load from series transformer pair side, isolation series transformer primary side connection full power convertor (VSC)
Series transformer, side structure in parallel are that the parallel connection converter of full power convertor (VSC) is connected in parallel on load-side.
The converter of connection load-side is known as parallel connection converter, is mainly used to control the stabilization of VSC DC voltages, electric current three
Mutually uneven and harmonic current compensation.The converter of connection isolation series transformer primary side is known as series transformer, main to use
In controlling the supply voltage of load, voltage three-phase imbalance and reactive-load compensation.
It is converted as a result of AC/DC/AC so that grid side and load-side are completely isolated, just by voltage close loop control
Load voltage can be controlled on arbitrary set point.
The isolation series transformer is series between distribution transformer output and load, the string of the full power convertor
Connection converter is connected to isolation series transformer primary side, and the parallel connection converter of full power convertor is in parallel with load-side, the power grid
The series transformer of side is for solving the problems, such as unbalance voltage and voltage fluctuation, and the parallel connection converter of the load-side is for solving
Out-of-balance current, reactive-load compensation and/or harmonic current problem.
It solves the problems, such as power distribution network transformer voltage imbalance and voltage fluctuation, specifically comprises the following steps：Distribution is detected to become
Depressor terminal voltage, and the positive and negative order components by extracting voltage, control negative sequence voltage is 0, and control positive sequence voltage is rated value,
Solve the problems, such as imbalance and the voltage fluctuation of voltage.
Solve the problems, such as that load-side current imbalance specifically comprises the following steps：The electric current for detecting load-side, extracts electric current
Positive and negative order components, control negative-sequence current is 0, solves the imbalance problem of electric current.
Solve the problems, such as that Power Distribution Network Reactive Power Compensation specifically comprises the following steps：The voltage and current of transformer terminal is detected, is led to
It is 1 to cross dynamic compensating reactive power current control power factor of electric network, in real time, linearly solves the problems, such as reactive-load compensation.
Power distribution network transformer harmonic problem is solved to specifically comprise the following steps：The voltage for detecting load end, passes through PLL locking phases
Ring obtains locking phase, and the electric current by detecting load-side, extracts harmonic current components, and control harmonic current is 0, is realized
The harmonic wave control of electric current.
By using closed-loop control to full power convertor (VSC), unbalance voltage, out-of-balance current, nothing are adjusted in real time
Work(compensates and harmonic wave control.
The positive and negative order components of the positive and negative order components and electric current of voltage are extracted by broad sense second order integro point-score.
The specific formula of broad sense second order integro point-score is as follows：
In formula：V is input signal, and v' is input signal, Hd(s) it is bandpass filter transmission function, Hq(s) it is low pass filtered
Wave device transmission function, ω are filter center angular frequency, and k is damping ratio.
When input voltage or current signal angular frequency consistent with filter center angular frequency, input signal v passes through Hd
(s), the output voltage signal v' that angular frequency is ω is obtained；Output signal qv' is identical as v' amplitudes, but 90 ° of delayed phase, i.e., defeated
It is orthogonal with qv' to go out signal v'.To realize voltage or electric current positive-negative sequence signal extraction using broad sense second order integro point-score.
Referring to Fig. 2, series transformer closed-loop control solves the problems, such as Voltage unbalance, voltage fluctuation and reactive-load compensation, passes through
Following steps are realized：
(1) grid phase θ is obtained by phase-locked loop plls；
(2) the positive and negative order components for extracting voltage carry out abc/dq transformation to negative sequence component, obtain the dq values of negative sequence component,
The dq given values of negative sequence component are all 0, carry out closed-loop control respectively on dq axis, and as needed, controller can be PI controls
Device can also be other kinds of controller.
Referring to Fig. 2, parallel connection converter closed-loop control solves the problems, such as current imbalance and harmonic problem, reactive-load compensation, passes through
Following steps are realized：
(1) grid phase θ is obtained by phase-locked loop plls；
(2) the positive and negative order components of load current are extracted, abc/dq transformation is carried out to negative sequence component, obtains the dq of negative sequence component
Value, the dq given values of negative sequence component are all 0, carry out closed-loop control respectively on dq axis, and as needed, controller can be PI controls
Device processed can also be other kinds of controller；
(3) corresponding abc/dq transformation is carried out by extracting each harmonic component, obtains the dq values of individual harmonic current,
The dq given values of harmonic component are all 0, carry out closed-loop control respectively on dq axis, and as needed, controller can be PI controls
Device can also be other kinds of controller；
(4) power distribution network transformer voltage and electric current are acquired, power factor is calculated, is 1 progress by given power factor
Closed-loop control is realized and adjusts reactive component in real time, and controller can be PI controllers, can also be other kinds of controller；
(5) in order to improve the stability and dynamic response performance of converter, electric current loop can generally be added.Electric current loop comes out
Voltage instruction, corresponding pwm signal is obtained by the modulation of SVPWM, is passed through and amplification is isolated is driven corresponding IGBT module.
The quality supply power quality requirement of load can not only be met in this way, but also good energy-saving effect can be reached.
Fig. 3 shows a kind of power distribution network transformer synthesis compensation device using full power convertor (VSC) as the present invention
The specific control block diagram of embodiment.
Grid side series transformer and load-side parallel connection converter all use vector control strategy, main Functional Module
It includes：For detecting the PLL phaselocked loops of grid side voltage-phase, PI controllers (by taking PI as an example, can be adopted according to actual conditions needs
With other kinds of controller), coordinate transformation module (abc/dq convert and dq/abc converters), comparator etc..Pass through vector
Control can keep each specified rate (including DC voltage, net side power, voltage on line side positive sequence negative phase-sequence d axis q axis components, load
Side electric current positive sequence negative phase-sequence d axis q axis components) reach setting value.
It is described as follows by taking load-side parallel connection converter as an example：
(1) the DC voltage U of VSC is acquireddc, grid side voltage UabclWith load-side three-phase current Iabcl。
(2) phase-locked loop pll and voltage U are utilizedabclObtain synchronized angle, θ.Based on θ by three-phase current IabclIt transforms to
On dq axis, positive-sequence component is respectively IdlposAnd Iqlpos, negative sequence component is respectively IdlnesAnd Iqlnes。
(3) given value of DC voltage isIt willWith virtual voltage UdcD has been obtained by PI controllers after relatively
The given value of current of the given value of current of axis, q axis is 0；The given and practical forward-order current of d axis, q shaft currents analyzes Idlpos、IqlposThan
Compared with by PI controllers along with the d axis and q shaft voltages for having obtained converter output after correlative coupling item.
(4) given value of current of negative phase-sequence converter d axis and q axis is 0, and given value of current and practical forward-order current analyze Idlpos、
IqlposCompare, current three-phase imbalance compensation component is obtained by PI controllers.
(5) positive-negative sequence d axis and q axis harmonic waves are extracted by harmonic current, calculate harmonic current compensation component.
(6) given value of inverter output voltage directly controls the IGBT of converter after PWM conditionings and realizes and close
Ring controls.
Grid side series transformer equally uses similar vector control strategy, and details are not described herein.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
The specific implementation of the present invention is confined to these explanations, and device is especially connected on to the mode and sheet of distribution transformer high-pressure side
It is consistent on inventive nature.For those of ordinary skill in the art to which the present invention belongs, structure of the present invention is not being departed from
Under the premise of think of, several equivalent substitute or obvious modifications is made, and performance or use is identical, all shall be regarded as belonging to the present invention
Protection domain.
Claims (10)
1. a kind of power distribution network transformer electric energy quality synthesis compensation apparatus, the device pass through in distribution transformer high-pressure side or low pressure
Full power convertor (VSC) and isolation series transformer are installed in side, and dynamic regulation output voltage and unbalance voltage, load are not
Balanced balanced current, harmonic current and reactive power compensation.
2. comprehensive compensating device as described in claim 1, which is characterized in that the full power convertor includes：Setting with
For solving Voltage unbalance and fluctuation problem, and the parallel connection in load-side is arranged in the series transformer of network transformer side
Converter, for solving the problems, such as current imbalance, harmonic wave control and reactive-load compensation.
3. comprehensive compensating device as claimed in claim 1 or 2, which is characterized in that the secondary side string of the isolation series transformer
It is coupled between distribution transformer output and load, the series transformer is connected to isolation series transformer primary side, the change in parallel
Parallel operation is in parallel with load-side.
4. a kind of power distribution network transformer power quality comprehensive compensation method, this method pass through in distribution transformer high-pressure side or low pressure
Side is installed by equipment, dynamic regulation output voltage and unbalance voltage, the out-of-balance current of load, harmonic current and reactive power
Compensation, which is characterized in that the method is realized by full power convertor (VSC) and isolation series transformer, described
Isolation series transformer is series between distribution transformer output and load, and the series transformer of the full power convertor is connected to
Series transformer primary side is isolated, the parallel connection converter of full power convertor is in parallel with load-side, the series connection transformation of the grid side
Device is for solving the problems, such as unbalance voltage and voltage fluctuation, and the parallel connection converter of the load-side is for solving uneven electricity
Stream, reactive-load compensation and harmonic current problem.
5. method as claimed in claim 4, which is characterized in that solve power distribution network transformer voltage imbalance and voltage fluctuation is asked
Topic, specifically comprises the following steps：Distribution transformer terminal voltage, and the positive and negative order components by extracting voltage are detected, control is negative
Sequence voltage is 0, and control positive sequence voltage is rated value, solves the problems, such as imbalance and the voltage fluctuation of voltage.
6. method as claimed in claim 4, which is characterized in that solve the problems, such as that load-side current imbalance specifically includes following step
Suddenly：The electric current for detecting load-side extracts the positive and negative order components of electric current, and control negative-sequence current is 0, and the imbalance for solving electric current is asked
Topic.
7. method as claimed in claim 4, which is characterized in that it is as follows to solve the problems, such as that Power Distribution Network Reactive Power Compensation specifically includes
Step：The voltage and current for detecting transformer terminal is 1 by dynamic compensating reactive power current control power factor of electric network, in real time, linearly
Solve the problems, such as reactive-load compensation.
8. method as claimed in claim 4, which is characterized in that solve power distribution network transformer harmonic problem and specifically include following step
Suddenly：The voltage for detecting load end obtains locking phase, and the electric current by detecting load-side by PLL phaselocked loops, and extraction is humorous
Wave current component, control harmonic current is 0, realizes the harmonic wave control of electric current.
9. the method as described in claim 4-8 is any, which is characterized in that series transformer closed-loop control solves Voltage unbalance
With voltage fluctuation problem, it is achieved by the steps of：
(1) grid phase θ is obtained by phase-locked loop plls；
(2) the positive and negative order components for extracting voltage carry out abc/dq transformation to negative sequence component, obtain the dq values of negative sequence component, negative phase-sequence
The dq given values of component are all 0, carry out closed-loop control respectively on dq axis, and as needed, controller can be PI controllers,
It can be other kinds of controller.
10. the method as described in claim 4-8 is any, which is characterized in that it is uneven that parallel connection converter closed-loop control solves electric current
Weighing apparatus and harmonic problem, are achieved by the steps of：
(1) grid phase θ is obtained by phase-locked loop plls；
(2) the positive and negative order components of load current are extracted, abc/dq transformation is carried out to negative sequence component, obtains the dq values of negative sequence component, is born
The dq given values of order components are all 0, carry out closed-loop control respectively on dq axis, and as needed, controller can be PI controllers,
It can also be other kinds of controller；
(3) corresponding abc/dq transformation is carried out by extracting each harmonic component, obtains the dq values of individual harmonic current, harmonic wave
The dq given values of component are all 0, carry out closed-loop control respectively on dq axis, and as needed, controller can be PI controllers,
It can be other kinds of controller；
(4) power distribution network transformer voltage and electric current are acquired, power factor is calculated, is 1 progress closed loop by given power factor
Control is realized and adjusts reactive component in real time, and controller can be PI controllers, can also be other kinds of controller.
(5) in order to improve the stability and dynamic response performance of converter, electric current loop is added, the voltage that electric current loop comes out refers to
It enables, corresponding pwm signal is obtained by the modulation of SVPWM, corresponding IGBT module is driven by the way that amplification is isolated.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109390960A (en) * | 2018-10-25 | 2019-02-26 | 南京赫曦电气有限公司 | Real-time online formula comprehensive compensating device and its method temporarily drop in a kind of distribution network voltage |
| CN110086169A (en) * | 2019-05-24 | 2019-08-02 | 青岛大学 | A kind of distribution network control method |
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| CN114243719A (en) * | 2021-12-24 | 2022-03-25 | 四川航电微能源有限公司 | Automatic voltage regulating device and system for long-distance power supply |
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| CN113852143A (en) * | 2020-06-28 | 2021-12-28 | 北京小米移动软件有限公司 | Electric energy management method and device and storage medium |
| CN114243719A (en) * | 2021-12-24 | 2022-03-25 | 四川航电微能源有限公司 | Automatic voltage regulating device and system for long-distance power supply |
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