CN104333003A - Harmonic control method for photovoltaic power generation system - Google Patents
Harmonic control method for photovoltaic power generation system Download PDFInfo
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- CN104333003A CN104333003A CN201410592206.8A CN201410592206A CN104333003A CN 104333003 A CN104333003 A CN 104333003A CN 201410592206 A CN201410592206 A CN 201410592206A CN 104333003 A CN104333003 A CN 104333003A
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- reactive power
- inversion unit
- controller
- svc
- photovoltaic
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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
- H02J3/18—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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
Disclosed is a harmonic control method for a photovoltaic power generation system. The method compensates a photovoltaic grid connected harmonic wave by the aid of a compensation reactor and an FC (fiber channel) filtration wave, influencing factors of a direct-current power supply of a photovoltaic array on the harmonic wave are simultaneously considered, the harmonic wave of the photovoltaic grid connected power generation system can be accurately compensated, the reactive power Q1 outputted by an inverter unit controller is received by an SVC (static var compensator) controller, the SVC controller comprehensively considers parameters such as system bus voltage Us, system inlet wire current Is, circuit breaker switching-closing conditions of an FC device, reactive power compensation quantity is calculated, reactive power compensation is realized by controlling a trigger angle alpha, and the reactive power compensation quantity is outputted in a PI adjusting mode.
Description
Technical field
The present invention relates to a kind of grid-connected technical field, particularly relate to a kind of grid-connected control method and structure of carrying out harmonic controling.
Background technology
Photovoltaic plant converts the direct current energy of photovoltaic array to can send into electrical network alternating current, in the process that photovoltaic plant electric energy is connected to the grid, can produce harmonic wave to electrical network, affect the quality of electrical network.
The photovoltaic DC-to-AC converter of current domestic research and development meets grid-connected requirement substantially, the active power compensator of harmonic controling many employings external hanging type of output, and cost is high, and volume is large, and power consumption is high, can not meet the high requirement of user under intelligent grid.
Therefore, research and develop the photovoltaic generating system of Novel control structure, realize output current harmonics and compensate accurately fast, have very important meaning.
Summary of the invention
The object of this invention is to provide a kind of Harmonic Control Method of photovoltaic generating system, the method adopts the mode of compensation reactor and FC filtering to compensate grid-connected harmonic wave, meanwhile, also contemplates photovoltaic array DC power supply to harmonic influence factor; The harmonic wave fine compensation to grid-connected photovoltaic system can be realized.
For achieving the above object, the present invention realizes by the following technical solutions:
A Harmonic Control Method for photovoltaic generating system, comprises following content:
1) photovoltaic array output is connected to capacitor, another termination inversion unit of capacitor, and inversion unit connects transformer, and transformer, capacitor C, reactor L, circuit breaker K1 connect successively, and circuit breaker K1 gets access to grid bus; Direct current collection point is provided with at the DC output end of photovoltaic array, by the current value input inversion unit controller that connection will gather, described inversion unit controller output pwm signal is to inversion unit, direct current for being exported by photovoltaic array is transformed into alternating current, by transformer, voltage transition is become suitable magnitude of voltage input electrical network; Described inversion unit controller also calculates reactive power Q 1 by the photovoltaic array DC side current value gathered, and this value is converted to the standard signal of 4-20mm, inputs to SVC controller;
2) SVC controller receives the reactive power Q 1 that inversion unit controller exports, and according to system busbar voltage U s and system inlet wire current Is, and the circuit-breaker switching on-off situation of FC device, SVC controller considers above parameter, reactive power compensation amount is calculated, realizes reactive power compensation by the mode controlling Trigger Angle α;
3) control strategy: by the on off state detecting FC filter circuit breaker, SVC controller judges whether FC filter branch devotes oneself to work, when after FC filter branch breaker closing, Sfcn state is designated as 1; When after FC filter branch breaker open operation, Sfcn state value is 0; Then, after suing for peace by the reactive power fixed compensation amount that each FC filter branch quantity of state is multiplied by this branch road, the idle amount of each filter branch of FC is obtained; By PI regulative mode, export reactive power compensation amount.
Compared with prior art, the invention has the beneficial effects as follows:
Inversion unit controller sends PWM triggering signal, and the direct current of photovoltaic array is transformed into alternating current through inversion unit, and inversion unit calculates the reactive power that photovoltaic array produces simultaneously, and this reactive power Q 1 is transferred to SVC controller; The voltage of SVC controller acquisition system bus, system inlet wire current, and the circuit-breaker switching on-off situation considering FC device, send control signal to compensation reactor.Control structure harmonic controling of the present invention is effective.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of control method of the present invention.
Fig. 2 is the control strategy block diagram of control method of the present invention.
Fig. 3 is the structure chart of inversion unit.
Fig. 4 is the structure chart of inversion unit controller.
Embodiment
Concrete technology contents of the present invention is described in detail below in conjunction with accompanying drawing.
See Fig. 1, Fig. 2, a kind of Harmonic Control Method of photovoltaic generating system, comprise following content:
1) photovoltaic array output is connected to capacitor, another termination inversion unit of capacitor, and inversion unit connects transformer, and transformer, capacitor C, reactor L, circuit breaker K1 connect successively, and circuit breaker K1 gets access to grid bus; Direct current collection point is provided with at the DC output end of photovoltaic array, by the current value input inversion unit controller that connection will gather, described inversion unit controller output pwm signal is to inversion unit, direct current for being exported by photovoltaic array is transformed into alternating current, by transformer, voltage transition is become suitable magnitude of voltage input electrical network; Described inversion unit controller also calculates reactive power Q 1 by the photovoltaic array DC side current value gathered, and this value is converted to the standard signal of 4-20mm, inputs to SVC controller;
2) SVC controller receives the reactive power Q 1 that inversion unit controller exports, and according to system busbar voltage U s and system inlet wire current Is, and the circuit-breaker switching on-off situation of FC device, SVC controller considers above parameter, reactive power compensation amount is calculated, realizes reactive power compensation by the mode controlling Trigger Angle α;
3) control strategy: by the on off state detecting FC filter circuit breaker, SVC controller judges whether FC filter branch devotes oneself to work, when after FC filter branch breaker closing, Sfcn state is designated as 1; When after FC filter branch breaker open operation, Sfcn state value is 0; Then, after suing for peace by the reactive power fixed compensation amount that each FC filter branch quantity of state is multiplied by this branch road, the idle amount of each filter branch of FC is obtained; By PI regulative mode, export reactive power compensation amount.
The concrete structure composition of this device:
See Fig. 1, SVC device comprises compensation reactor, FC filter, SVG controller, the busbar voltage Us of SVG controller acquisition system and system inlet wire current Is, and the killer switch situation of FC device, SVG controller also receives the reactive power signals Q1 that inversion unit controller exports; SVC controller considers above parameter, calculates reactive power compensation amount, realizes reactive power compensation by the mode controlling Trigger Angle.
Photovoltaic array output is connected to capacitor, another termination inversion unit of capacitor, and inversion unit connects transformer, and transformer, capacitor C, reactor L, circuit breaker K1 connect successively, and circuit breaker K1 gets access to grid bus; Direct current collection point is provided with at the DC output end of photovoltaic array, by the current value input inversion unit controller that connection will gather, described inversion unit controller output pwm signal is to inversion unit, direct current for being exported by photovoltaic array is transformed into alternating current, by transformer, voltage transition is become suitable magnitude of voltage input electrical network.
Fig. 3 is the structure chart of inversion unit, form two level PWM inversions with diode (D1, D2, D3, D4, D5, D6) inverse parallel respectively by six IGBT wholly-controled device (IGBT1, IGBT2, IGBT3, IGBT4, IGBT5, IGBT6), after inversion, signal inputs by capacitor C, reactor L LC filter branch in series through transformer.Reactor L another end is also connected to circuit breaker K1, and circuit breaker K1 is connected with electrical network bus.
Fig. 4 is inversion unit controller architecture sketch, controller is made up of fpga chip, cpu chip, A/D chip, voltage signal or current signal enter cpu chip after A/D conversion, enter fpga chip, the pwm control signal of power output unit after fpga chip process after cpu chip process.
SVC is idle, and control procedure is as follows:
When FC filter branch drops into, the idle amount that SVC need compensate increases, and TCR Trigger Angle diminishes, and exports corresponding lagging reactive power; On the contrary when after the excision of FC filter branch, the idle amount that SVC need compensate reduces, and TCR Trigger Angle becomes large, exports corresponding lagging reactive power and reduces.When the idle increase of photovoltaic array perception, the idle total amount that SVC need compensate reduces, and TCR Trigger Angle becomes large, exports corresponding lagging reactive power and reduces.If after predictive compensation, system reactive power occurs stablizing deviation, then PI governing loop starts, and eliminates the steady state error compensated.
In Fig. 2: Qfcn is the compensating power value of each FC filtering channel
Sfcn is the on off state of each filtering channel
Q1 is that inversion unit controller calculates reactive power output valve
Q is system inlet wire SVC reactive power compensation desired value
Qs is system inlet wire reactive power detection value
Us is system busbar voltage
Is is system inlet wire current value
The synthetic load of SVC equipment replacement is except comprising filter FC, photovoltaic array, also comprise other accessory power supply load be under same bussed supply, SVC equipment self adds integral adjustment in control mode, to ensure the stable state compensation effect of SVC compensator, the reactive power simultaneously also corrected due to photovoltaic array calculates the compensate that error causes.
Claims (1)
1. a Harmonic Control Method for photovoltaic generating system, comprises following content:
1) photovoltaic array output is connected to capacitor, another termination inversion unit of capacitor, and inversion unit connects transformer, and transformer, capacitor C, reactor L, circuit breaker K1 connect successively, and circuit breaker K1 gets access to grid bus; Direct current collection point is provided with at the DC output end of photovoltaic array, by the current value input inversion unit controller that connection will gather, described inversion unit controller output pwm signal is to inversion unit, direct current for being exported by photovoltaic array is transformed into alternating current, by transformer, voltage transition is become suitable magnitude of voltage input electrical network; Described inversion unit controller also calculates reactive power Q 1 by the photovoltaic array DC side current value gathered, and this value is converted to the standard signal of 4-20mm, inputs to SVC controller;
2) SVC controller receives the reactive power Q 1 that inversion unit controller exports, and according to system busbar voltage U s and system inlet wire current Is, and the circuit-breaker switching on-off situation of FC device, SVC controller considers above parameter, reactive power compensation amount is calculated, realizes reactive power compensation by the mode controlling Trigger Angle α;
3) control strategy: by the on off state detecting FC filter circuit breaker, SVC controller judges whether FC filter branch devotes oneself to work, when after FC filter branch breaker closing, Sfcn state is designated as 1; When after FC filter branch breaker open operation, Sfcn state value is 0; Then, after suing for peace by the reactive power fixed compensation amount that each FC filter branch quantity of state is multiplied by this branch road, the idle amount of each filter branch of FC is obtained; By PI regulative mode, export reactive power compensation amount.
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| CN201410592206.8A CN104333003A (en) | 2014-10-28 | 2014-10-28 | Harmonic control method for photovoltaic power generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114156902A (en) * | 2021-11-25 | 2022-03-08 | 国网山东省电力公司莒县供电公司 | Reactive compensation intelligent management and control system for photovoltaic power generation surplus power internet |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0934617A1 (en) * | 1996-10-15 | 1999-08-11 | Siemens Aktiengesellschaft | Method and device for compensating reactive current portions by means of a compensation arrangement with a pulse current rectifier |
| CN101277017A (en) * | 2008-02-02 | 2008-10-01 | 中国电力科学研究院 | Method for regulating static reactive compensator of power transmission system |
| CN201247959Y (en) * | 2008-08-25 | 2009-05-27 | 西安森宝电气工程有限公司 | Stillness type high voltage reactive compensator of control transformer based on thyristor |
| CN102118032A (en) * | 2011-03-29 | 2011-07-06 | 荣信电力电子股份有限公司 | SVC reactive prediction and compensation method for rectifier load |
| CN202309091U (en) * | 2011-11-04 | 2012-07-04 | 辽宁省电力有限公司抚顺供电公司 | No-voltage-surge resection device for thyristor valve group when switch is shared by TCR and FC |
| CN203574377U (en) * | 2013-07-18 | 2014-04-30 | 新疆希望电子有限公司 | Static reactive power compensator for 10kV long-distance power supply |
-
2014
- 2014-10-28 CN CN201410592206.8A patent/CN104333003A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0934617A1 (en) * | 1996-10-15 | 1999-08-11 | Siemens Aktiengesellschaft | Method and device for compensating reactive current portions by means of a compensation arrangement with a pulse current rectifier |
| CN101277017A (en) * | 2008-02-02 | 2008-10-01 | 中国电力科学研究院 | Method for regulating static reactive compensator of power transmission system |
| CN201247959Y (en) * | 2008-08-25 | 2009-05-27 | 西安森宝电气工程有限公司 | Stillness type high voltage reactive compensator of control transformer based on thyristor |
| CN102118032A (en) * | 2011-03-29 | 2011-07-06 | 荣信电力电子股份有限公司 | SVC reactive prediction and compensation method for rectifier load |
| CN202309091U (en) * | 2011-11-04 | 2012-07-04 | 辽宁省电力有限公司抚顺供电公司 | No-voltage-surge resection device for thyristor valve group when switch is shared by TCR and FC |
| CN203574377U (en) * | 2013-07-18 | 2014-04-30 | 新疆希望电子有限公司 | Static reactive power compensator for 10kV long-distance power supply |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114156902A (en) * | 2021-11-25 | 2022-03-08 | 国网山东省电力公司莒县供电公司 | Reactive compensation intelligent management and control system for photovoltaic power generation surplus power internet |
| CN114156902B (en) * | 2021-11-25 | 2023-10-31 | 国网山东省电力公司莒县供电公司 | Reactive compensation intelligent management and control system for photovoltaic power generation residual electricity internet surfing |
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Application publication date: 20150204 |