CN106941258A - A kind of power factor control method and device applied to transverter - Google Patents
A kind of power factor control method and device applied to transverter Download PDFInfo
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- CN106941258A CN106941258A CN201710221037.0A CN201710221037A CN106941258A CN 106941258 A CN106941258 A CN 106941258A CN 201710221037 A CN201710221037 A CN 201710221037A CN 106941258 A CN106941258 A CN 106941258A
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- power
- reactive power
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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
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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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Abstract
The invention provides a kind of power factor control method and device applied to transverter, reactive power reference qref is obtained by being controlled to power factor：Power factor reference value is set, power factor reference value and power factor measured value are made into poor adjusted by PI obtains reactive power reference qref, and final reactive power reference qref is obtained after reactive power reference qref is added with the setting value of reactive power；Reactive power regulation is determined to reactive power reference qref progress and obtains current reference value.The power factor that transverter exchanges access point have adjusted by the present invention, add the control function of transverter, make control function more flexible, suitable for many application scenarios, this power factor control method can be on the premise of wave filter of not increasing exchanges, the power factor of access point is lifted, reduces influence of the harmonic source to AC system and flexible direct current transverter.
Description
Technical field
The invention belongs to technical field of direct current power transmission, more particularly to a kind of power factor control method applied to transverter
And device.
Background technology
Since being proposed from the Technology of HVDC based Voltage Source Converter based on modularization multi-level converter (MMC), flexible DC power transmission
System obtains fast development in the engineer applied of power system at home, and has shown good technical characteristic.With routine
HVDC Transmission Technology is compared, and flexible direct current power transmission system control has two frees degree, is decoupled by the dq of interior ring controller, can
Independently to control the active power and reactive power that transverter is exported, and in the absence of commutation failure problem, and can be to passive system
System power supply, with larger development prospect.
Reactive power is a key factor in Operation of Electric Systems, and most of network elements and load are required for consumption
Reactive power, and most of customer charges are also required to consumption reactive power, such as transformer, a large amount of inductor motors, gas
The equipment such as electric discharge electric light, electric fan, refrigerator, air-conditioning, load, they not only need to absorb active power from power system, together
When need absorbing reactive power, with produce these equipment maintain normal work necessary to alternating magnetic field, reactive power is not nothing
With power, it can create necessary condition for the exchange of energy, conveying, conversion.
Therefore, in order to convey active power, it is necessary to which the voltage of sending end and receiving end has certain phase difference, in order to convey
Reactive power is needed to consume reactive power during conveying active power, disappeared if desired, it is necessary to both end voltage has certain difference in magnitude
The reactive power of consumption will be provided by generator and be irrational through long-distance transmission, and this is accomplished by consuming reactive power
Place produces reactive power, accordingly, it would be desirable to reactive power compensation, i.e., be controlled to reactive power.
Wherein, power factor is to influence a key factor of reactive power, and power factor is active power and apparent work(
The ratio of rate, its rate of change will directly affect the ratio of system active power and reactive power, in view of the characteristics of power generation, work(
The height of rate factor makes full use of to hair, for, electrical equipment, saves electric energy and improves quality of voltage important, is
This electric power industry enterprise especially payes attention to the management of power factor, reactive power is entered to users, particularly big industrial user
Row compensation, such as uses the pattern for determining reactive power to Reactive Power Control, but when using Reactive Power Control pattern is determined, by
In the control for not considering power factor, the enable of transverter is caused to control underaction, control function is relatively simple, and in the change of current
Device AC do not increase exchanges wave filter when, if do not controlled reasonably power factor, it will increase Harmonic Current pair
The influence of AC system and flexible direct current transverter.
The content of the invention
It is an object of the invention to provide a kind of power factor control method and device applied to transverter, for soft
Property DC converter using determine reactive power progress idle pressure regulation when do not consider that the regulation of power factor causes the control of transverter
Underaction, the problem of control function is single.
To achieve the above object, the technical scheme is that：
A kind of power factor control method applied to transverter, reactive power is obtained by being controlled to power factor
Reference value：Set power factor reference value COS θref, by power factor reference value COS θrefWith power factor measured value COS θmeas
Make difference and reactive power reference qref Q is obtained by PI regulationscosθ_ref, by reactive power reference qref Qcosθ_refWith setting for reactive power
Definite value Qac_setFinal reactive power reference qref Q is obtained after additionac_ref_final；To reactive power reference qref Qac_ref_finalEnter
Row determines reactive power regulation and obtains current reference value.
Further, the reactive power reference qref Qcosθ_refBy by power factor reference value COS θrefWith power factor
Measured value work difference is multiplied by ± 1 by PI regulations and obtained, wherein ± 1 selection is by reactive power measured value Qac_measDetermine, if inspection
It is that perception takes 1 to survey idle, if detection reactive power is that capacitive takes -1.
Further, if do not need power factor controlling, by reactive power reference qref Qcosθ_refIt is decreased to 0.
Further, if do not need power factor controlling, by reactive power reference qref Qcosθ_refSubtracted with the slope of setting
As low as 0.
Present invention also offers a kind of power factor control device applied to transverter, including power factor controller and
Reactive power controller, wherein, the power factor controller is used to power factor is adjusted to obtain reactive power reference
Value：Set power factor reference value COS θref, by power factor reference value COS θrefWith power factor measured value COS θmeasIt is poor to make
Reactive power reference qref Q is obtained by PI regulationscosθ_ref, by reactive power reference qref Qcosθ_refWith the setting value of reactive power
Qac_setFinal reactive power reference qref Q is obtained after additionac_ref_final, the reactive power controller is for described idle
Value and power reference regulation obtains current reference value.
Further, in the power factor controller, the reactive power reference qref Qcosθ_refBy by power factor
Reference value COS θref± 1 is multiplied by with power factor measured value work difference by PI regulations to obtain, wherein ± 1 selection is by reactive power
Measured value Qac_measDetermine, if it is that perception takes 1 that detection is idle, if detection reactive power is that capacitive takes -1.
Further, if do not need power factor controlling, by reactive power reference qref Qcosθ_refIt is decreased to 0.
Further, if do not need power factor controlling, by reactive power reference qref Qcosθ_refSubtracted with the slope of setting
As low as 0.
The beneficial effects of the invention are as follows：
The present invention obtains reactive power reference qref by being controlled to power factor：Power factor reference value is set, will
Power factor reference value makees poor adjusted by PI with power factor measured value and obtains reactive power reference qref, by reactive power reference
Value obtains final reactive power reference qref after being added with the setting value of reactive power；Reactive power reference qref is carried out fixed idle
Power adjusting obtains current reference value.The power factor that transverter exchanges access point have adjusted by the present invention, the change of current is added
The control function of device, makes control function more flexible, it is adaptable to many application scenarios.
Brief description of the drawings
Fig. 1 is the structure chart of flexible direct current transverter；
Fig. 2 is MMC transverter submodular circuits figures；
Fig. 3 is the dual-loop controller theory diagram of flexible direct current transverter；
Fig. 4 is the power factor controller theory diagram of flexible direct current transverter.
Embodiment
The embodiment to the present invention is further described below in conjunction with the accompanying drawings：
A kind of embodiment of power factor control method applied to transverter of the present invention：
The power factor control method applied to transverter that the present invention is provided, its object is to for controlling transverter to hand over
Flow the power factor of access point.
The flexible direct current transverter of the present embodiment uses MMC topological structures, as shown in figure 1, transverter includes three-phase bridge arm,
Include including corresponding bridge arm inductance and the MMC submodules of N number of series connection on upper bridge arm and lower bridge arm, each bridge arm per phase bridge arm,
Upper bridge arm and lower bridge arm are connected by corresponding bridge arm inductance, and upper bridge arm is identical with the MMC submodule quantities that lower bridge arm includes, its
In, each MMC submodules use half-bridge structure, as shown in Fig. 2 each half-bridge submodule includes 2 IGBT, 2 inverse parallels two
Pole pipe, 1 storage capacitor and a resistance, as other embodiment, transverter submodule can also use full bridge structure.
The reactive power control method for the flexible direct current transverter that the present embodiment is provided as shown in Figure 3 and Figure 4, including to soft
Property DC converter overall double -loop control and the power factor controlling that is attached on the basis of Reactive Power Control.Wherein, outer shroud
For power ring, including constant DC voltage control, determine active power controller, determine Reactive Power Control and determine alternating voltage control, it is interior
Ring is electric current loop, is added by PI adjustment items, feedforward term with decoupling item and obtains modulation voltage reference value, is specifically：
Active power controller selects constant DC voltage control or determines the power outer shroud control of active power controller according to demand,
Reactive Power Control is determined in Reactive Power Control selection, and the current inner loop control of active power obtains d axle inner ring current reference values
Id_ref, Reactive Power Control current inner loop control obtain q axle inner ring current reference values Iq_ref, by d axle inner ring current reference values
Id_refWith q axle inner ring current reference value d axle modulation voltage axle reference values U is respectively obtained by inner ring current controllerd_refAnd q
Axle reference value Uq_ref, d axles and q axles are entered into line translation and obtain three-phase modulations voltage reference value Ua_ref、Ub_ref、Uc_ref.Wherein, outside
Ring controller reference value is increased with certain slope, so that corresponding controlled quatity steadily changes in system.
Because power factor has a certain impact to the control process for determining Reactive Power Control pattern, so in surely idle work(
Under rate control model, additional control has been carried out to power factor, as shown in figure 4, the X in figure can take+1 or -1, specific control
Process processed is：Set power factor reference value COS θrefAfterwards, power factor controlling is enabled, by power factor reference value COS θrefWith
Power factor measured value COS θmeasIt is poor to make, then carries out PI controls, and idle with reference to needed for system is that perception or capacitive reactive power are multiplied by
" ± 1 " obtains the reactive power reference qref Q of power factor controller outputcosθ_ref, determine that X takes+1 or -1 detailed process to be：
Qac_measIt is reactive power measured value, if detection Qac_meas>=0, then output -1 is multiplied with PI output obtains Qcosθ_ref；If inspection
Survey Qac_meas<0, then output+1 is multiplied with PI output obtains Qcosθ_ref, even detect that idle is that capacitive takes -1, if detection is idle
It is that perception takes+1, -1 or+1 is multiplied with PI output and obtains Qcosθ_ref, the then setting plus reactive power controller in itself
Value Qac_setObtain final reactive power reference qref Qac_ref_final, by Qac_ref_finalProgress is determined Reactive Power Control and obtained
To current instruction value, wherein, Qac_ref_finalOutput area changed according to power system capacity and current active power measured value self adaptation
Become.In the state of power factor controlling enable, if power factor need not be controlled again, it can carry out forbidding power factor control
The operation of system.After power factor controlling is forbidden, reactive power reference qref Qcosθ_refIt is decreased to 0 with certain slope, so as to avoid
The mutation of system reactive power.
Present invention also offers a kind of power factor control device applied to transverter, including power factor controller and
Reactive power controller, wherein, power factor controller is used to power factor is adjusted to obtain reactive power reference qref：If
Determine power factor reference value, power factor reference value and power factor measured value are made into poor adjusted by PI obtains reactive power ginseng
Value is examined, final reactive power reference qref, idle work(are obtained after reactive power reference qref is added with the setting value of reactive power
Rate controller is used to obtain current reference value to reactive power reference qref regulation.Transverter exchange is have adjusted using the control device
The power factor of access point, adds the control function of transverter, makes control function more flexible, it is adaptable to many applied fields
Close.
Above-mentioned power factor control device, actually a kind of software architecture, wherein each module and unit be with it is above-mentioned
Control method corresponding process or program.Therefore, no longer the control device is described in detail.
Specific embodiment is presented above, but the present invention is not limited to embodiment described above.The present invention
Basic ideas be above-mentioned basic scheme, for those of ordinary skill in the art, according to the teachings of the present invention, design each
Plant the model deformed, formula, parameter and creative work need not be spent.In the principle and the situation of spirit for not departing from the present invention
Under to embodiment carry out change, modification, replacement and modification still fall within protection scope of the present invention.
Claims (8)
1. a kind of power factor control method applied to transverter, it is characterised in that by being controlled to power factor
To reactive power reference qref：Set power factor reference value COS θref, by power factor reference value COS θrefIt is real with power factor
Measured value COS θmeasMake difference and reactive power reference qref Q is obtained by PI regulationscosθ_ref, by reactive power reference qref Qcosθ_refWith nothing
The setting value Q of work(powerac_setFinal reactive power reference qref Q is obtained after additionac_ref_final；To reactive power reference qref
Qac_ref_finalProgress determines reactive power regulation and obtains current reference value.
2. the power factor control method according to claim 1 applied to transverter, it is characterised in that the idle work(
Rate reference value Qcosθ_refBy by power factor reference value COS θrefMake poor adjusted by PI with power factor measured value and be multiplied by ± 1
Obtain, wherein ± 1 selection is by reactive power measured value Qac_measDetermine, if it is that perception takes 1 that detection is idle, if detecting idle work(
Rate is that capacitive takes -1.
3. the power factor control method according to claim 1 applied to transverter, it is characterised in that if not needing work(
When rate factor is controlled, by reactive power reference qref Qcosθ_refIt is decreased to 0.
4. the power factor control method according to claim 3 applied to transverter, it is characterised in that if not needing work(
When rate factor is controlled, by reactive power reference qref Qcosθ_refIt is decreased to 0 with the slope of setting.
5. a kind of power factor control device applied to transverter, it is characterised in that including power factor controller and idle
Power controller, wherein, the power factor controller is used to power factor is adjusted to obtain reactive power reference qref：If
Determine power factor reference value COS θref, by power factor reference value COS θrefWith power factor measured value COS θmeasPass through as difference
PI regulations obtain reactive power reference qref Qcosθ_ref, by reactive power reference qref Qcosθ_refWith the setting value Q of reactive powerac_set
Final reactive power reference qref Q is obtained after additionac_ref_final, the reactive power controller is for the reactive power
Reference value adjustments obtain current reference value.
6. the power factor control device according to claim 5 applied to transverter, it is characterised in that the power because
In number controller, the reactive power reference qref Qcosθ_refBy by power factor reference value COS θrefWith power factor measured value
Work difference is multiplied by ± 1 by PI regulations and obtained, wherein ± 1 selection is by reactive power measured value Qac_measDetermine, if detection is idle
It is that perception takes 1, if detection reactive power is that capacitive takes -1.
7. the power factor control device according to claim 5 applied to transverter, it is characterised in that if not needing work(
When rate factor is controlled, by reactive power reference qref Qcosθ_refIt is decreased to 0.
8. the power factor control device according to claim 7 applied to transverter, it is characterised in that if not needing work(
When rate factor is controlled, by reactive power reference qref Qcosθ_refIt is decreased to 0 with the slope of setting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710221037.0A CN106941258B (en) | 2017-04-06 | 2017-04-06 | Power factor control method and device applied to current converter |
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| CN201710221037.0A CN106941258B (en) | 2017-04-06 | 2017-04-06 | Power factor control method and device applied to current converter |
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| CN106941258A true CN106941258A (en) | 2017-07-11 |
| CN106941258B CN106941258B (en) | 2020-05-19 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019228028A1 (en) * | 2018-05-28 | 2019-12-05 | 南京南瑞继保电气有限公司 | Compensator, control method and device therefor |
| CN114938039A (en) * | 2022-06-14 | 2022-08-23 | 深圳市优优绿能股份有限公司 | Reactive power regulation method and system for single-phase grid-connected inverter and computer storage medium |
| CN115051398A (en) * | 2022-06-22 | 2022-09-13 | 普世通（北京）电气有限公司 | Dynamic voltage compensation device and multi-mode fast switching control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102959841A (en) * | 2010-06-29 | 2013-03-06 | 伊顿工业公司 | Power factor control of a cyclo-converter |
| CN104065087A (en) * | 2014-06-26 | 2014-09-24 | 国家电网公司 | Distribution transformer reactive power compensation method |
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2017
- 2017-04-06 CN CN201710221037.0A patent/CN106941258B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102959841A (en) * | 2010-06-29 | 2013-03-06 | 伊顿工业公司 | Power factor control of a cyclo-converter |
| CN104065087A (en) * | 2014-06-26 | 2014-09-24 | 国家电网公司 | Distribution transformer reactive power compensation method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019228028A1 (en) * | 2018-05-28 | 2019-12-05 | 南京南瑞继保电气有限公司 | Compensator, control method and device therefor |
| CN114938039A (en) * | 2022-06-14 | 2022-08-23 | 深圳市优优绿能股份有限公司 | Reactive power regulation method and system for single-phase grid-connected inverter and computer storage medium |
| CN115051398A (en) * | 2022-06-22 | 2022-09-13 | 普世通（北京）电气有限公司 | Dynamic voltage compensation device and multi-mode fast switching control method thereof |
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