CN108134397A - A kind of reactive automatic compensating method based on centralized photovoltaic DC-to-AC converter - Google Patents
A kind of reactive automatic compensating method based on centralized photovoltaic DC-to-AC converter Download PDFInfo
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- CN108134397A CN108134397A CN201810003768.2A CN201810003768A CN108134397A CN 108134397 A CN108134397 A CN 108134397A CN 201810003768 A CN201810003768 A CN 201810003768A CN 108134397 A CN108134397 A CN 108134397A
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- Prior art keywords
- reactive power
- constant current
- idle
- power
- reactive
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
-
- 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
- Y02E40/30—Reactive power compensation
Abstract
The present invention provides a kind of reactive automatic compensating methods based on centralized photovoltaic DC-to-AC converter, belong to electronic technology field.It solves the problems, such as that the grid-connected rear owner side power factor of photovoltaic owner reduces in the prior art.This method includes：Pass through the reactive power Q of the real-time gathering main side transformer of power meter；The reactive power Q of acquisition is judged, analyze the type of the reactive power Q and determines to need to compensate according to the type of reactive power Q idle to constant current IqType；It calculates idle to constant current Iq, it is idle to constant current I by what is be calculatedqCompensation is added in inverter current control ring, and the reactive power Q of transformer is compensated by the control of inverter current control ring.This method can effectively improve the power factor of owner side, reduce owner's loss, improve power grid power quality.
Description
Technical field
The invention belongs to electronic technology fields, are related to a kind of transformer control method, particularly a kind of based on centralized light
Lie prostrate the reactive automatic compensating method of inverter.
Background technology
In photovoltaic plant industry, when inverter active power of output is more than the 50% of its rated power, power factor
0.98 (advanced or lag) should be not less than；For active power of output when between 20%~50%, power factor should be not less than 0.95
(advanced or lag).For distributed photovoltaic project, before photovoltaic system is not installed, since owner's load-side is typically equipped with nothing
Reactive power compensation installations, generally capacitance reactive compensation cabinet, power factor all reach more than 0.9, but after installation photovoltaic generating system,
Power factor is often below 0.9, even lower.It illustrates：Certain workshop before photovoltaic is not installed active power be 100kW, industry
After main capacitance cabinet reactive-load compensation, remaining reactive power is 30kVar, according to formula (1)：
Current power factor PF=0.957, meets the requirements.After photovoltaic is installed, photovoltaic generation power 60kW, then owner
Side active power is P=100kW-60kW=40kW, because photovoltaic DC-to-AC converter power factor is generally more than 0.99, therefore, industry
Main side is idle to maintain essentially in 30kVar, and owner side power factor is：
It can be seen that after installation photovoltaic, since photovoltaic active power and network re-active power must be offset so that owner is from electricity
The active power that net obtains declines, and reactive power is constant, results in the relatively low of owner side power factor.Cause damages to owner and
Reduce public electric wire net power quality.
Invention content
The purpose of the present invention is being directed to existing technology, there are the above problems, it is proposed that one kind is based on centralized photovoltaic inversion
The reactive automatic compensating method of device, the technical problem to be solved is that how in owner installation photovoltaic post-compensation owner side for this method
Reactive power to improve the power factor of owner side.
The purpose of the present invention can be realized by following technical proposal：It is a kind of based on centralized photovoltaic DC-to-AC converter it is idle from
Dynamic compensation method, which is characterized in that the method includes：Pass through the reactive power Q of the real-time gathering main side transformer of power meter；
The reactive power Q of acquisition is judged, analyze the type of the reactive power Q and needs are determined according to the type of reactive power Q
The idle of compensation gives constant current IqType；It calculates idle to constant current Iq, it is idle to constant current I by what is be calculatedqCompensation adds
Enter into inverter current control ring, the reactive power Q of transformer is compensated by the control of inverter current control ring.
In a kind of above-mentioned reactive automatic compensating method based on centralized photovoltaic DC-to-AC converter, constant current I is given to idleq
The determining of type specifically include：
The reactive power currently acquired is lagging reactive power, then needs the idle to constant current I of compensationqIt is given for capacitive reactive power
Constant current Iq；
The reactive power currently acquired is capacitive reactive power, then needs the idle to constant current I of compensationqIt is given for inductive reactive power
Constant current Iq。
It is described idle to constant current in a kind of above-mentioned reactive automatic compensating method based on centralized photovoltaic DC-to-AC converter
IqCompensation specifically include：
When reactive power is lagging reactive power, increase capacitive reactive power gives constant current IqIt is given, if the perception of feedback
Reactive power is reduced, then continues increase capacitive reactive power and give constant current Iq；If increasing capacitive reactive power gives constant current IqAfterwards, it feeds back idle
Power becomes capacitive, then reduces capacitive reactive power and give constant current Iq；
When reactive power is capacitive reactive power, increase inductive reactive power gives constant current IqIt is given, if the capacitive of feedback
Reactive power is reduced, then continues increase inductive reactive power and give constant current Iq；If increasing inductive reactive power gives constant current IqAfterwards, it feeds back idle
Power becomes lagging reactive power, then reduces inductive reactive power and give constant current Iq。
In a kind of above-mentioned reactive automatic compensating method based on centralized photovoltaic DC-to-AC converter, calculate described idle given
Electric current IqSpecifically include：
Acquire the reactive power Q of transformer：
Acquisition is applied to the rated voltage U at transformer both endsn；
According to reactive power Q and rated voltage UnIt calculates idle to constant current Iq；
In a kind of above-mentioned reactive automatic compensating method based on centralized photovoltaic DC-to-AC converter, the inverter current control
Ring processed includes detection control ring and compensation control ring, and the detection control ring includes solar components control source, MPPT is controlled
Device, adder, pi regulator and electric current output；The compensation control ring includes power meter, is idle to constant current IqCalculator adds
Musical instruments used in a Buddhist or Taoist mass, pi regulator and electric current output.MPPT controller is capable of the generating voltage of detecting real-time solar panels, and tracks highest electricity
Piezoelectricity flow valuve；It is idle to give constant current IqCalculator is calculated idle to constant current I by the reactive power Q that power meter acquiresq。
Compared with prior art, the reactive automatic compensating method of the invention based on centralized photovoltaic DC-to-AC converter can increase
The power factor of owner side, and there is real-time, high efficiency and stability, the loss of owner is effectively reduced,
And improve the power quality of grid-connected rear public electric wire net.
Description of the drawings
Fig. 1 is the control flow of the reactive automatic compensating method based on centralized photovoltaic DC-to-AC converter in the embodiment of the present invention
Figure.
Fig. 2 is the schematic diagram of inverter current control ring in the embodiment of the present invention.
Specific embodiment
The following is specific embodiments of the present invention and with reference to attached drawing, technical scheme of the present invention is further described,
But the present invention is not limited to these embodiments.
As shown in Figure 1, include based on the reactive automatic compensating method of centralized photovoltaic DC-to-AC converter：It is real-time by power meter
The reactive power Q of gathering main side transformer；The reactive power Q of acquisition is judged, analyzes the type of the reactive power Q simultaneously
It determines to need to compensate according to the type of reactive power Q idle to constant current IqType；It calculates idle to constant current Iq, will count
What is obtained is idle to constant current IqCompensation is added in inverter current control ring, passes through the control of inverter current control ring
The reactive power Q of transformer is compensated.
Specifically, constant current I is given to idleqType determine and compensation process specifically include：
The reactive power currently acquired is lagging reactive power, then needs the idle to constant current I of compensationqIt is given for capacitive reactive power
Constant current Iq；At this point, increase capacitive reactive power gives constant current IqIt is given, if the lagging reactive power of feedback is reduced, continue to increase
Capacitive reactive power gives constant current Iq；If increasing capacitive reactive power gives constant current IqAfterwards, feedback reactive power becomes capacitive, then reduces capacitive
It is idle to give constant current Iq。
The reactive power currently acquired is capacitive reactive power, then needs the idle to constant current I of compensationqIt is given for inductive reactive power
Constant current Iq；Increase inductive reactive power gives constant current I at this timeqIt is given, if the capacitive reactive power of feedback is reduced, continue to increase
Inductive reactive power gives constant current Iq；If increasing inductive reactive power gives constant current IqAfterwards, feedback reactive power becomes lagging reactive power, then
It reduces inductive reactive power and gives constant current Iq。
It calculates described idle to constant current IqSpecifically include：
Acquire the reactive power Q of transformer：
Acquisition is applied to the rated voltage U at transformer both endsn；
According to reactive power Q and rated voltage UnIt calculates idle to constant current Iq, specific formula for calculation is as follows：Iq=Q/3
×Un×1.414；
As shown in Fig. 2, inverter current control ring includes detection control ring and compensation control ring, the detection control ring packet
Include solar components control source, MPPT controller, adder, pi regulator and electric current output；The compensation control ring includes
Power meter, it is idle to constant current Iq calculators, adder, pi regulator and electric current output.MPPT controller being capable of detecting real-time
The generating voltage of solar panels, and track ceiling voltage current value；It is idle to give what constant current Iq calculators were acquired by power meter
Reactive power Q calculates idle to constant current Iq.By in inverter current control ring, adding in the idle benefit to constant current Iq
Then the amount of repaying adjusts input current of inverter, so as to reach idle work(caused by compensator transformer by pi regulator closed loop
Rate.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can do various modifications or additions to described specific embodiment or replace in a similar way
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (5)
1. a kind of reactive automatic compensating method based on centralized photovoltaic DC-to-AC converter, which is characterized in that the method includes：Pass through
The reactive power Q of the real-time gathering main side transformer of power meter；The reactive power Q of acquisition is judged, analyzes the idle work(
The type of rate Q simultaneously determines to need to compensate idle to constant current I according to the type of reactive power QqType；It calculates idle given
Electric current Iq, it is idle to constant current I by what is be calculatedqCompensation is added in inverter current control ring, passes through inverter current control
The control of ring processed compensates the reactive power Q of transformer.
2. a kind of reactive automatic compensating method based on centralized photovoltaic DC-to-AC converter according to claim 1, feature exist
In to idle to constant current IqThe determining of type specifically include：
The reactive power currently acquired is lagging reactive power, then needs the idle to constant current I of compensationqElectricity is given for capacitive reactive power
Flow Iq；
The reactive power currently acquired is capacitive reactive power, then needs the idle to constant current I of compensationqElectricity is given for inductive reactive power
Flow Iq。
3. a kind of reactive automatic compensating method based on centralized photovoltaic DC-to-AC converter according to claim 2, feature exist
In described idle to constant current IqCompensation specifically include：
When reactive power is lagging reactive power, increase capacitive reactive power gives constant current IqIt is given, if the inductive reactive power work(of feedback
Rate is reduced, then continues increase capacitive reactive power and give constant current Iq；If increasing capacitive reactive power gives constant current IqAfterwards, feedback reactive power becomes
For capacitive, then reduce capacitive reactive power and give constant current Iq；
When reactive power is capacitive reactive power, increase inductive reactive power gives constant current IqIt is given, if the capacitive reactive power work(of feedback
Rate is reduced, then continues increase inductive reactive power and give constant current Iq；If increasing inductive reactive power gives constant current IqAfterwards, feedback reactive power becomes
For lagging reactive power, then reduce inductive reactive power and give constant current Iq。
4. a kind of reactive automatic compensating method based on centralized photovoltaic DC-to-AC converter according to claims 1 or 2 or 3,
It is characterized in that, calculates described idle to constant current IqSpecifically include：
Acquire the reactive power Q of transformer：
Acquisition is applied to the rated voltage U at transformer both endsn；
According to reactive power Q and rated voltage UnIt calculates idle to constant current Iq。
5. a kind of reactive automatic compensating method based on centralized photovoltaic DC-to-AC converter according to claim 1, feature exist
In the inverter current control ring includes detection control ring and compensation control ring, and the detection control ring includes solar energy group
Part control source, MPPT controller, adder, pi regulator and electric current output；The compensation control ring includes power meter, idle
Give constant current IqCalculator, adder, pi regulator and electric current output.
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| CN201810003768.2A CN108134397A (en) | 2018-01-03 | 2018-01-03 | A kind of reactive automatic compensating method based on centralized photovoltaic DC-to-AC converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN116388211A (en) * | 2023-06-07 | 2023-07-04 | 国网上海能源互联网研究院有限公司 | Distributed photovoltaic grid-connected voltage out-of-limit treatment method, device, system and medium |
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| US20100067271A1 (en) * | 2008-09-15 | 2010-03-18 | General Electric Company | Reactive power compensation in solar power system |
| CN103280835A (en) * | 2013-05-16 | 2013-09-04 | 南京南瑞太阳能科技有限公司 | Method for controlling power generation state of three-phase grid-connected photovoltaic inverter |
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| US20100067271A1 (en) * | 2008-09-15 | 2010-03-18 | General Electric Company | Reactive power compensation in solar power system |
| CN103280835A (en) * | 2013-05-16 | 2013-09-04 | 南京南瑞太阳能科技有限公司 | Method for controlling power generation state of three-phase grid-connected photovoltaic inverter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN116388211A (en) * | 2023-06-07 | 2023-07-04 | 国网上海能源互联网研究院有限公司 | Distributed photovoltaic grid-connected voltage out-of-limit treatment method, device, system and medium |
| CN116388211B (en) * | 2023-06-07 | 2023-08-11 | 国网上海能源互联网研究院有限公司 | Distributed photovoltaic grid-connected voltage out-of-limit treatment method, device, system and medium |
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