CN105743134A - Adaptive quick regulation photovoltaic AVC (automatic voltage control) method - Google Patents
Adaptive quick regulation photovoltaic AVC (automatic voltage control) method Download PDFInfo
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- CN105743134A CN105743134A CN201610216462.6A CN201610216462A CN105743134A CN 105743134 A CN105743134 A CN 105743134A CN 201610216462 A CN201610216462 A CN 201610216462A CN 105743134 A CN105743134 A CN 105743134A
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- reactive power
- voltage
- value
- system impedance
- photovoltaic
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000003044 adaptive effect Effects 0.000 title abstract 2
- 230000035945 sensitivity Effects 0.000 claims abstract description 7
- 230000006978 adaptation Effects 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000009514 concussion Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 206010003830 Automatism Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- H02J3/383—
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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
Abstract
The invention discloses an adaptive quick regulation photovoltaic AVC (automatic voltage control) method. The method comprises the following steps of step 1, receiving a voltage target value issued by dispatch; step 2, obtaining a real-time information value of a photovoltaic power station; step 3, calculating the system impedance of the photovoltaic power station; step 4, converting the voltage target value into a reactive power target value; step 5, performing reactive power regulation and allocation in inverters and reactive compensation equipment; step 6, issuing instructions in parallel to each inverter and reactive compensation equipment; and step 7, after waiting for a certain while, detecting whether a given voltage target value is achieved or not; if so, finishing the operation; and or otherwise, executing the step S2. According to the method, the reactive power regulation coefficient is added, the system impedance is adjusted, the inverter with high sensitivity is preferentially chosen, and the instructions are sent in parallel, so that the regulation speed and precision are improved, and efficient voltage regulation is realized.
Description
Technical field
The present invention relates to a kind of self adaptation and quickly regulate photovoltaic AVC control method, belong to photovoltaic generation power AVC (AutomaticVoltageControl) automatism voltage control field.
Background technology
Current national greatly develops clean energy technology, and photovoltaic generation is important component part.Photovoltaic generation is characterized as being renewable, pollution-free, and being limited in exerts oneself fluctuates with weather conditions, impacts big after grid-connected for electrical network, and particularly extensive centralized photovoltaic plant becomes apparent from.Photovoltaic plant should be accomplished adjustable, controlled, the safe operation of such guarantee electrical network, so extensive concentration is that photovoltaic plant should configure reactive voltage control system, possesses voltage and reactive power control capability.Instruction according to power scheduling department, photovoltaic plant is automatically adjusted its reactive power sending (absorption), controls photovoltaic electric station grid connection point voltage in normal operation range.
Current photovoltaic plant is after receiving the voltage target of dispatching down distributing, AVC controls system and voltage target generally converts to reactive power target, carry out the distribution of reactive power again, distribute to the reactive-load compensation equipment such as inverter and SVG, to reach to regulate the purpose of grid-connected point voltage.When carrying out voltage target with Target of Reactive Power conversion, it is necessary to system impedance value, this value can set in advance, when, after the certain number of times of system fading margin, system, according to the information obtained and data, can be passed through self-learning method prediction and participate in the system impedance of computing next time.If exceed setting, present algorithms most in use is to take system impedance to be worth the upper limit.But due in photovoltaic plant, and there is bigger time error sometimes in the idle collection value of the voltage acquisition value of site and the equipment such as inverter and SVG, cause that the system impedance calculated is big with actual gap, reactive power Target Transformation obtains inaccurate, have impact on governing speed, even there will be the problem regulating concussion.
Although the Reactive-power control equipment inverter of photovoltaic plant and SVG governing speed are fast, but due to large number of, in communication, have the reasons such as delay, affect governing speed, make AVC can not be completed given adjustment target at the appointed time.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides a kind of self adaptation and quickly regulate photovoltaic AVC control method.
In order to achieve the above object, the technical solution adopted in the present invention is:
Self adaptation quickly regulates photovoltaic AVC control method, comprises the following steps,
Step 1, receives the voltage-target of dispatching down distributing；
Step 2, obtains photovoltaic plant real time information value；
Step 3, calculates the system impedance of photovoltaic plant；
If first time uses, system impedance adopts default value；
If existing historical data or real time data, then calculate new system impedance value, and record the system impedance value that in nearest a period of time, adjustment sensitivity is the highest, if the system impedance value calculated surmounts the upper limit, then adopt and in nearest a period of time, regulate the system impedance value that sensitivity is the highest；
Step 4, is converted to reactive power desired value by voltage-target；
Reactive power desired value=reactive power difference × reactive power adjustment factor；
Wherein,
Calculate the difference of voltage-target and actual voltage value, utilize system impedance value, convert voltage difference to reactive power difference；
Extent according to voltage-target Yu actual voltage value, sets reactive power adjustment factor；
Step 5, carries out reactive power in inverter and reactive-load compensation equipment and regulates distribution；
When carrying out reactive power and regulating distribution, the inverter that preferential adjustment is highly sensitive；
Step 6, issues a command to each inverter and reactive-load compensation equipment under parallel；
Step 7, after waiting for a period of time, checking whether the voltage-target reaching to give, if reaching, then terminating, if not up to, then go to step 2.
Photovoltaic plant real time information value includes photovoltaic plant booster stations electric parameters, the running state information of inverter and electric parameters, the running status of reactive-load compensation equipment and electric parameters.
Reactive power adjustment factor can regulate according to the extent of voltage-target with actual voltage value, when difference is bigger, increases reactive power adjustment factor, difference hour, reduces reactive power adjustment factor.
Reactive power adjustment factor is less than or equal to 1.
The beneficial effect that the present invention reaches: 1, the present invention is by increasing reactive power adjustment factor, adjustment system impedance, the prioritizing selection highly sensitive inverter of adjustment and transmitted in parallel instruction method, improve governing speed and precision, reach the purpose of efficient voltage-regulation；2, in system impedance more in limited time, carry out reactive power desired value conversion by the previous system impedance value recording the regulating effect preserved optimum, improve the accuracy of system impedance, governing speed can be accelerated；3, reactive power adjustment factor is added, the extent according to reality site actual voltage value and voltage-target, automatically adjust proportionality coefficient, it is prevented that regulate concussion, improve adjustment efficiency；4, when carrying out reactive power and regulating distribution, the inverter that preferential adjustment is highly sensitive, improves governing speed and efficiency；5, adopt parallel communication, accelerate instruction downloading speed, substantially increase governing speed.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.Following example are only for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
As it is shown in figure 1, self adaptation quickly regulates photovoltaic AVC control method, comprise the following steps:
Step 1, receives the voltage-target of dispatching down distributing.
Step 2, obtains photovoltaic plant real time information value.
Photovoltaic plant real time information value includes photovoltaic plant booster stations electric parameters, the running state information of inverter and electric parameters, the running status of reactive-load compensation equipment and electric parameters.
Step 3, calculates the system impedance of photovoltaic plant.
If first time uses, system impedance adopts default value；If existing historical data or real time data, then calculate new system impedance value, and record the system impedance value that in nearest a period of time, adjustment sensitivity is the highest, if the system impedance value calculated surmounts the upper limit, then adopt and in nearest a period of time, regulate the system impedance value that sensitivity is the highest, improve the accuracy of system impedance, governing speed can be accelerated.
Step 4, is converted to reactive power desired value by voltage-target.
1) calculate the difference of voltage-target and actual voltage value, utilize system impedance value, convert voltage difference to reactive power difference.
2) extent according to voltage-target Yu actual voltage value, sets reactive power adjustment factor；Reactive power adjustment factor can regulate according to the extent of voltage-target with actual voltage value, when difference is bigger, increase reactive power adjustment factor, regulate paces big, difference hour, reduce reactive power adjustment factor, regulate paces little, control reactive power, voltage is made to approach desired value gradually, avoiding regulating concussion, improve adjustment efficiency, this reactive power adjustment factor is less than or equal to 1.
3) reactive power desired value=reactive power difference × reactive power adjustment factor.
Step 5, carries out reactive power in inverter and reactive-load compensation equipment and regulates distribution；When carrying out reactive power and regulating distribution, the inverter that preferential adjustment is highly sensitive.
1) according to the running status of inverter and reactive-load compensation equipment and electric parameters, it is determined that may participate in the equipment of control；
2) calculate each controllable device and may participate in the reactive power nargin of adjustment；
3) find out the highly sensitive equipment of adjustment preferentially to carry out entirely regulating to improve governing speed and efficiency；
4) other equipment are carried out regulating distribution and the calculating of reactive power by set algorithm.
Step 6, under issue a command to each inverter and reactive-load compensation equipment.
In order to reduce between adjustment, under parallel, issue a command to each inverter and reactive-load compensation equipment.
Step 7, after wait for a period of time (may be set to 10s), checking whether the voltage-target reaching to give, if reaching, then terminating, if not up to, then go to step 2.
Said method crosses increase reactive power adjustment factor, adjustment system impedance, the prioritizing selection highly sensitive inverter of adjustment and transmitted in parallel instruction method, improves governing speed and precision, reaches the purpose of efficient voltage-regulation.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvement and deformation, these improve and deformation also should be regarded as protection scope of the present invention.
Claims (4)
1. self adaptation quickly regulates photovoltaic AVC control method, it is characterised in that: comprise the following steps,
Step 1, receives the voltage-target of dispatching down distributing；
Step 2, obtains photovoltaic plant real time information value；
Step 3, calculates the system impedance of photovoltaic plant；
If first time uses, system impedance adopts default value；
If existing historical data or real time data, then calculate new system impedance value, and record the system impedance value that in nearest a period of time, adjustment sensitivity is the highest, if the system impedance value calculated surmounts the upper limit, then adopt and in nearest a period of time, regulate the system impedance value that sensitivity is the highest；
Step 4, is converted to reactive power desired value by voltage-target；
Reactive power desired value=reactive power difference × reactive power adjustment factor；
Wherein,
Calculate the difference of voltage-target and actual voltage value, utilize system impedance value, convert voltage difference to reactive power difference；
Extent according to voltage-target Yu actual voltage value, sets reactive power adjustment factor；
Step 5, carries out reactive power in inverter and reactive-load compensation equipment and regulates distribution；
When carrying out reactive power and regulating distribution, the inverter that preferential adjustment is highly sensitive；
Step 6, issues a command to each inverter and reactive-load compensation equipment under parallel；
Step 7, after waiting for a period of time, checking whether the voltage-target reaching to give, if reaching, then terminating, if not up to, then go to step 2.
2. self adaptation according to claim 1 quickly regulates photovoltaic AVC control method, it is characterised in that: photovoltaic plant real time information value includes photovoltaic plant booster stations electric parameters, the running state information of inverter and electric parameters, the running status of reactive-load compensation equipment and electric parameters.
3. self adaptation according to claim 1 quickly regulates photovoltaic AVC control method, it is characterized in that: reactive power adjustment factor can regulate according to the extent of voltage-target with actual voltage value, when difference is bigger, increase reactive power adjustment factor, difference hour, reduces reactive power adjustment factor.
4. the self adaptation according to claim 1 or 3 quickly regulates photovoltaic AVC control method, it is characterised in that: reactive power adjustment factor is less than or equal to 1.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353625A (en) * | 2016-11-02 | 2017-01-25 | 广东电网有限责任公司佛山供电局 | Method and system for detecting voltage and reactive power regulation effect of transformer substation |
| CN109710020A (en) * | 2018-12-05 | 2019-05-03 | 国电南瑞南京控制系统有限公司 | A kind of new energy power station actively approximant Poewr control method and system |
| CN111817348A (en) * | 2020-07-31 | 2020-10-23 | 苏州华商新能源有限公司 | Reactive voltage control method for photovoltaic power station |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009065778A (en) * | 2007-09-06 | 2009-03-26 | Tokyo Electric Power Co Inc:The | Power system monitor control system |
| CN102868167A (en) * | 2012-09-11 | 2013-01-09 | 南京中德保护控制系统有限公司 | Reactive voltage control method of photovoltaic power station |
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- 2016-04-08 CN CN201610216462.6A patent/CN105743134B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009065778A (en) * | 2007-09-06 | 2009-03-26 | Tokyo Electric Power Co Inc:The | Power system monitor control system |
| CN102868167A (en) * | 2012-09-11 | 2013-01-09 | 南京中德保护控制系统有限公司 | Reactive voltage control method of photovoltaic power station |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353625A (en) * | 2016-11-02 | 2017-01-25 | 广东电网有限责任公司佛山供电局 | Method and system for detecting voltage and reactive power regulation effect of transformer substation |
| CN106353625B (en) * | 2016-11-02 | 2019-06-11 | 广东电网有限责任公司佛山供电局 | The voltage power-less regulating effect detection method and system of substation |
| CN109710020A (en) * | 2018-12-05 | 2019-05-03 | 国电南瑞南京控制系统有限公司 | A kind of new energy power station actively approximant Poewr control method and system |
| CN111817348A (en) * | 2020-07-31 | 2020-10-23 | 苏州华商新能源有限公司 | Reactive voltage control method for photovoltaic power station |
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