CN116436103A - Reactive compensation control system based on photovoltaic - Google Patents
Reactive compensation control system based on photovoltaic Download PDFInfo
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- CN116436103A CN116436103A CN202310608636.3A CN202310608636A CN116436103A CN 116436103 A CN116436103 A CN 116436103A CN 202310608636 A CN202310608636 A CN 202310608636A CN 116436103 A CN116436103 A CN 116436103A
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- 238000001514 detection method Methods 0.000 claims abstract description 51
- 238000010248 power generation Methods 0.000 claims abstract description 49
- 238000004146 energy storage Methods 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 abstract description 15
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 230000005684 electric field Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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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
- H02J3/38—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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- 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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- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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 application relates to a reactive compensation control system based on photovoltaic, which comprises a photovoltaic power generation module, an inversion module and a detection control module; the photovoltaic power generation module is used for receiving solar energy and outputting direct-current electric energy; the inversion module is used for receiving the direct-current electric energy and outputting active electric energy and reactive electric energy, or is used for receiving the direct-current electric energy and outputting reactive electric energy; the detection control module is used for detecting the power consumption of the load, wherein the power consumption comprises reactive power; the detection control module is used for controlling the reactive power output by the inversion module based on the reactive power. The load preferentially obtains reactive power energy based on photovoltaic conversion for reactive compensation, is beneficial to increasing the proportionality constant of active power in a power grid, and is beneficial to design capacity of power supply equipment, investment reduction, line loss reduction and the like. Under the condition that reactive power converted by the photovoltaic cannot meet reactive compensation, the load continues to acquire reactive power from the power grid.
Description
Technical Field
The application relates to the field of reactive power compensation, in particular to a reactive power compensation control system based on photovoltaics.
Background
In a power supply system: active power is the electrical power required to keep the consumer operating properly, i.e., to convert electrical energy into other forms of energy.
In an ac circuit having an inductance and a capacitance, the phase angles of the voltage and the current are not uniform due to the characteristics of the inductance or the capacitance, and these elements store the energy of the magnetic field (or electric field) in the period of half the period, and send the stored energy of the magnetic field (or electric field) to the power supply in the period of the other half of the period, and they exchange energy with the power supply only, and do not really consume energy, and the exchanged power value is called reactive power.
The power factor is an important index for reflecting the reasonable use condition, the electric energy utilization degree and the electric power management level of electric power consumer electric equipment.
The proportionality constant of active power in the power grid is increased, and the power factor is improved, so that the design capacity of power supply equipment can be reduced, investment is reduced, line loss is reduced, and the like.
Disclosure of Invention
In order to increase the proportion of active power in a power grid, the application provides a reactive compensation control system based on photovoltaic.
The reactive compensation control system based on the photovoltaic adopts the following technical scheme:
a reactive compensation control system based on photovoltaic comprises a photovoltaic power generation module, an inversion module and a detection control module;
the photovoltaic power generation module is used for receiving solar energy and outputting direct-current electric energy;
the inversion module is used for receiving the direct-current electric energy and outputting active electric energy and reactive electric energy,
or the inversion module is used for receiving the direct-current electric energy and outputting reactive electric energy;
the detection control module is used for detecting the power consumption of the load, wherein the power consumption comprises reactive power;
the detection control module is used for controlling the reactive power output by the inversion module based on the reactive power.
By adopting the technical scheme, the load preferentially acquires reactive power energy based on photovoltaic conversion for reactive power compensation.
Under the condition that reactive power based on photovoltaic conversion cannot meet reactive compensation, a load continuously acquires reactive power from a power grid; the method is beneficial to increasing the proportionality constant of active power in the power grid, facilitating the design capacity of power supply equipment, reducing investment, reducing line loss and the like.
Under the condition that reactive power based on photovoltaic conversion meets reactive power compensation, the load can also acquire active power based on photovoltaic conversion; and the electric energy obtained by the load from the power grid is reduced.
Preferably, ŋ =active power/(active power+reactive power), ŋ e [0, 1).
By adopting the technical scheme, the electric energy of photovoltaic conversion is preferentially used for reactive compensation.
Preferably, in a case where the reactive power is greater than or equal to the generated power of the photovoltaic power generation module, the detection control module outputs ŋ =0.
By adopting the technical scheme, the photovoltaic conversion electric energy is used for reactive compensation, so that the reactive electric energy obtained by the load from the power grid is reduced as much as possible.
Preferably, the detection control module is used for controlling the inversion module to output alternating current to the power grid under the condition that the power consumption is smaller than the generated power of the photovoltaic power generation module.
Preferably, the energy storage device further comprises an energy storage module; the energy storage module is used for storing electric energy;
and under the condition that the power consumption is smaller than the power generation power of the photovoltaic power generation module, the detection control module is used for controlling the photovoltaic power generation module to output direct current to the energy storage module.
Preferably, the detection control module is used for controlling the inversion module to receive the electric energy stored by the energy storage module under the condition that the electric power is larger than the generated power of the photovoltaic power generation module.
Preferably, the photovoltaic power generation module comprises a plurality of photovoltaic power generation plates, the inversion module comprises a plurality of inverters, the inverters are in one-to-one correspondence with the photovoltaic power generation plates,
at any moment, the inverter is used for outputting active power or reactive power.
By adopting the technical scheme, only reactive power energy is output for one inverter at any moment, and only active power energy is possibly output for another inverter.
Preferably, the detection control module is further configured to obtain status information of the inverter;
the detection control module generates an estimated remaining lifetime based on the state information and a preset lifetime preset mechanism;
and under the condition that the reactive power is changed, the detection control module preferentially controls the inverter with short predicted remaining life time to switch the working state.
By adopting the technical scheme, the service lives of all the inverters form more remarkable difference, so that the other inverters still have longer service lives under the condition that a certain inverter reaches the service life for maintenance, and the operation of the system is further maintained.
Preferably, the energy storage device further comprises an energy storage module; the energy storage module is used for storing electric energy;
the detection control module is also used for acquiring the state information of the inverter;
the detection control module generates an estimated remaining lifetime based on the state information and a preset lifetime preset mechanism;
and under the condition that the predicted remaining life time is smaller than a preset value, the detection control module is used for controlling the corresponding photovoltaic power generation module to output direct current to the energy storage module.
By adopting the technical scheme, under the condition that a certain inverter is maintained after reaching the service life, the photovoltaic power generation panel corresponding to the inverter can still work normally, and the output electric energy is stored for subsequent use.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the load preferentially acquires reactive power energy based on photovoltaic conversion for reactive power compensation; under the condition that reactive power based on photovoltaic conversion cannot meet reactive compensation, a load continuously acquires reactive power from a power grid; the proportional constant of active power in the power grid is increased, the design capacity of power supply equipment is facilitated, the investment is reduced, the line loss is reduced, and the like;
2. under the condition that reactive power based on photovoltaic conversion meets reactive power compensation, the load can also acquire active power based on photovoltaic conversion; the electric energy obtained by the load from the power grid is reduced;
3. the service lives of all the inverters are obviously different, so that when one inverter reaches the service life and is maintained, the rest inverters still have longer service lives, and the operation of the system is maintained.
Drawings
Fig. 1 is a block diagram of a photovoltaic-based reactive compensation control system.
Reference numerals illustrate: 1. a photovoltaic power generation module; 2. an inversion module; 3. a detection control module; 4. and an energy storage module.
Detailed Description
The present application is described in further detail below in conjunction with fig. 1.
Referring to fig. 1, an embodiment of the application discloses a reactive compensation control system based on photovoltaic, which comprises a photovoltaic power generation module 1, an inversion module 2 and a detection control module 3.
The photovoltaic power generation module 1 comprises a plurality of photovoltaic power generation panels, and the photovoltaic power generation panels are used for receiving solar energy and outputting direct-current electric energy.
The inverter module 2 comprises several inverters. The number of the inverters is the same as that of the photovoltaic power generation plates, and the inverters are in one-to-one correspondence with the photovoltaic power generation plates. The inverter is used for receiving direct current power and outputting alternating current power.
In this embodiment, the ac power is divided into active power or reactive power; at any moment, the inverter only outputs active power or reactive power; at any moment, at least one inverter outputs reactive power; the inverter module 2 outputs active power and reactive power, or the inverter module 2 outputs reactive power; ŋ =active power/(active power+reactive power), ŋ e [0,1 ].
The detection control module 3 is used for detecting the power consumption of the load, wherein the power consumption comprises reactive power and active power. And the detection control module 3 controls the reactive power output from the inverter module 2 based on the reactive power.
Specifically, in the case where the reactive power is greater than or equal to the generated power of the photovoltaic power generation module 1, the detection control module 3 outputs ŋ =0; that is, the detection control module 3 controls the inverter module 2 to output only reactive power (the detection control module 3 controls all the inverters to output reactive power). At this time, all the electric energy generated by the photovoltaic power generation module 1 is used for reactive power compensation of the load, and the load still obtains the reactive power through the power grid to meet the reactive power compensation requirement.
The power consumption is larger than the power generation power of the photovoltaic power generation module 1, and under the condition that the reactive power is smaller than the power generation power, the detection control module 3 outputs ŋ based on the ratio of the reactive power to the power generation power; the inverter module 2 outputs reactive power and active power (part of the inverters output reactive power, and the remaining inverters output active power). At this time, the electric energy provided by the photovoltaic power generation module 1 can meet the reactive compensation requirement of the load, and all the electric energy obtained by the load from the power grid is used for doing work.
In the case where the electric power is smaller than the generated power of the photovoltaic power generation module 1, the detection control module 3 outputs ŋ based on the ratio of the reactive power to the generated power. At this time, the electric energy provided by the photovoltaic power generation module 1 can meet the power consumption requirement of the load, and the load does not need to acquire electric energy from the power grid. Meanwhile, the detection control module 3 controls the inversion module 2 to output an alternating current point to the power grid.
In another embodiment, the reactive compensation control system further comprises an energy storage module 4. The energy storage module 4 is connected to the photovoltaic power generation module 1 for receiving direct current and storing electric energy. The energy storage module 4 may be a battery.
In the case that the power consumption is smaller than the generated power of the photovoltaic power generation module 1, the detection control module 3 controls the photovoltaic power generation module 1 to output direct current to the energy storage module 4.
The energy storage module 4 stores electric energy, and the detection control module 3 is used for controlling the inversion module 2 to receive the electric energy stored by the energy storage module 4 under the condition that the electric power is larger than the generated power of the photovoltaic power generation module 1.
The detection control module 3 is also used for acquiring the state information of the inverter; the state information of the inverter comprises the accumulated time length and the accumulated times of the reactive power output by the inverter, the accumulated time length and the accumulated times of the active power output by the inverter and the like.
The detection control module 3 generates an estimated remaining lifetime based on the status information and a preset lifetime preset mechanism. I.e. corresponding to each inverter, respectively, generating a corresponding estimated remaining life time.
In the case of a change in reactive power, the detection control module 3 preferentially controls the inverter whose estimated remaining life time is short to switch operating states.
Specific:
under the condition that the power consumption is smaller than the generated power and the reactive power is increased, ŋ is reduced, and the detection control module 3 controls the inverter with the shortest predicted remaining life time in the inverter which outputs the active power to switch to output the reactive power;
under the condition that the power consumption is smaller than the generated power and the reactive power is reduced, ŋ is increased, and the detection control module 3 controls the inverter with the shortest predicted remaining life time in the inverter which outputs the reactive power to switch to output the active power;
under the conditions that the reactive power is larger than the generated power and the reactive power is increased, ŋ is always equal to 0, namely the detection control module 3 always controls all inverters to output reactive power;
under the conditions that the reactive power is larger than the power generation power, the reactive power is reduced, and the reduced reactive power is larger than the power generation power, ŋ is always equal to 0, namely the detection control module 3 always controls all inverters to output reactive power;
and under the conditions that the reactive power is larger than the generated power, the reactive power is reduced, and the reduced reactive power is smaller than the generated power, ŋ is increased, namely the detection control module 3 controls the inverter with the shortest predicted residual life time in the inverter which outputs the reactive power to switch to output the active power.
Meanwhile, under the condition that the predicted remaining life time is smaller than a preset value, the detection control module 3 controls the corresponding photovoltaic power generation module 1 to output direct current to the energy storage module 4; and, the detection control module 3 outputs maintenance prompt information.
The reactive power compensation control system based on the photovoltaic comprises the following implementation principles: the load preferentially takes reactive power based on photovoltaic conversion for reactive compensation.
Under the condition that reactive power based on photovoltaic conversion cannot meet reactive compensation, a load continuously acquires reactive power from a power grid; the method is beneficial to increasing the proportionality constant of active power in the power grid, facilitating the design capacity of power supply equipment, reducing investment, reducing line loss and the like.
Under the condition that reactive power based on photovoltaic conversion meets reactive power compensation, the load can also acquire active power based on photovoltaic conversion; and the electric energy obtained by the load from the power grid is reduced.
The service lives of all the inverters are obviously different, so that when one inverter reaches the service life and is maintained, the rest inverters still have longer service lives, and the operation of the system is maintained.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (9)
1. A reactive compensation control system based on photovoltaic, characterized in that: the device comprises a photovoltaic power generation module (1), an inversion module (2) and a detection control module (3);
the photovoltaic power generation module (1) is used for receiving solar energy and outputting direct-current electric energy;
the inversion module (2) is used for receiving the direct current electric energy and outputting active electric energy and reactive electric energy,
or the inversion module (2) is used for receiving direct-current electric energy and outputting reactive electric energy;
the detection control module (3) is used for detecting the power consumption of the load, wherein the power consumption comprises reactive power;
the detection control module (3) is used for controlling the reactive power output by the inversion module (2) based on the reactive power.
2. The photovoltaic-based reactive compensation control system of claim 1, wherein: ŋ =active power/(active power+reactive power), ŋ e [0,1 ].
3. The photovoltaic-based reactive compensation control system of claim 2, wherein: and when the reactive power is greater than or equal to the generated power of the photovoltaic power generation module (1), the detection control module (3) outputs ŋ =0.
4. The photovoltaic-based reactive compensation control system of claim 1, wherein: under the condition that the power consumption is smaller than the generated power of the photovoltaic power generation module (1), the detection control module (3) is used for controlling the inversion module (2) to output alternating current to a power grid.
5. The photovoltaic-based reactive compensation control system of claim 1, wherein: also comprises an energy storage module (4); the energy storage module (4) is used for storing electric energy;
under the condition that the power consumption is smaller than the generated power of the photovoltaic power generation module (1), the detection control module (3) is used for controlling the photovoltaic power generation module (1) to output direct current to the energy storage module (4).
6. The photovoltaic-based reactive compensation control system of claim 5, wherein: under the condition that the power consumption is larger than the generated power of the photovoltaic power generation module (1), the detection control module (3) is used for controlling the inversion module (2) to receive the electric energy stored by the energy storage module (4).
7. The photovoltaic-based reactive compensation control system of claim 1, wherein: the photovoltaic power generation module (1) comprises a plurality of photovoltaic power generation plates, the inversion module (2) comprises a plurality of inverters, the inverters are in one-to-one correspondence with the photovoltaic power generation plates,
at any moment, the inverter is used for outputting active power or reactive power.
8. The photovoltaic-based reactive compensation control system of claim 7, wherein: the detection control module (3) is also used for acquiring the state information of the inverter;
the detection control module (3) generates estimated remaining life time based on state information and a preset life preset mechanism;
and under the condition that the reactive power is changed, the detection control module (3) preferentially controls the inverter with short predicted residual life time to switch the working state.
9. The photovoltaic-based reactive compensation control system of claim 7, wherein: also comprises an energy storage module (4); the energy storage module (4) is used for storing electric energy;
the detection control module (3) is also used for acquiring the state information of the inverter;
the detection control module (3) generates estimated remaining life time based on state information and a preset life preset mechanism;
and under the condition that the predicted remaining life time is smaller than a preset value, the detection control module (3) is used for controlling the corresponding photovoltaic power generation module (1) to output direct current to the energy storage module (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310608636.3A CN116436103A (en) | 2023-05-26 | 2023-05-26 | Reactive compensation control system based on photovoltaic |
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| CN202310608636.3A CN116436103A (en) | 2023-05-26 | 2023-05-26 | Reactive compensation control system based on photovoltaic |
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| CN116436103A true CN116436103A (en) | 2023-07-14 |
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| CN202310608636.3A Pending CN116436103A (en) | 2023-05-26 | 2023-05-26 | Reactive compensation control system based on photovoltaic |
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- 2023-05-26 CN CN202310608636.3A patent/CN116436103A/en active Pending
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Effective date of registration: 20230913 Address after: 318010 Building 9, Zone C, Juxing scientific innovation park, Hongsan Road, Xiachen street, Jiaojiang District, Taizhou City, Zhejiang Province (self declaration) Applicant after: TAIZHOU ANJPOWER EQUIPMENT Co.,Ltd. Address before: Room 101, Building 30, Baoshi Sewing Technology Industrial Park, No. 1, Airport South Road, Xiachen Street, Jiaojiang District, Taizhou City, Zhejiang Province, 318000 (self declaration) Applicant before: Zhejiang Jiukai Electric Power Technology Co.,Ltd. |