CN109412174B - Flexible grid connection method and device for light storage power generation system based on UPFC - Google Patents
Flexible grid connection method and device for light storage power generation system based on UPFC Download PDFInfo
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- 238000003860 storage Methods 0.000 title claims abstract description 106
- 238000010248 power generation Methods 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims abstract description 77
- 230000001360 synchronised effect Effects 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 9
- 238000004590 computer program Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
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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
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
- H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
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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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- H02J3/383—
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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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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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
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The invention relates to a flexible grid-connected method and a device of an optical storage power generation system based on UPFC, which mainly comprises the steps of firstly collecting the voltage amplitude and phase of the optical storage power generation system and the voltage amplitude and phase of a large power grid; calculating voltage amplitude difference and phase deviation between the light storage power generation system and a large power grid; and controlling the UPFC to inject compensation voltage into the grid-connected node by taking the voltage amplitude difference and the phase deviation as compensation targets, so as to realize grid connection of the optical storage power generation system and the large power grid. The invention can realize seamless and flexible paralleling and splitting of the light storage power generation system and the large power grid, so that the equipment of the large power grid can operate efficiently, and the power supply reliability and the overall stability are improved.
Description
Technical Field
The invention belongs to the field of power flow control and photovoltaic power generation of a power system, and particularly relates to a flexible grid-connected method and device of a light storage power generation system based on UPFC.
Background
At present, a grid connection method of an off-grid type optical storage power generation system generally adopts a direct grid connection technology, a virtual synchronous generator grid connection technology and the like, wherein the direct grid connection technology adopts the principle that a grid connection switch is directly closed when the voltage amplitude and the phase of the optical storage power generation system are consistent with the voltage of a large power grid, and the method inevitably generates large impact and oscillation and easily causes grid connection failure and even damages the system. The grid connection technology principle of the virtual synchronous generator is that the virtual generator characteristic of the converter is utilized to enable the converter to be used as a voltage source to achieve grid connection of the light storage power generation system, and the method is high in threshold and poor in practice, so that large-scale application is not achieved.
Therefore, a grid connection method which can be applied to a grid connection process of an optical energy storage power generation system in a large scale is needed, and the problems of more voltage fluctuation of grid connection nodes, unbalanced three phases and frequency fluctuation are solved.
Disclosure of Invention
The invention aims to provide a flexible grid connection method and device of an optical storage power generation system based on UPFC (unified power flow controller), which are used for solving the problems of non-stop node voltage fluctuation, three-phase imbalance and frequency fluctuation in the grid connection process of the optical storage power generation system and a large power grid.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention provides a flexible grid connection method of a light storage power generation system based on UPFC, which comprises the following steps:
1) collecting the voltage amplitude and phase of the light storage power generation system and the voltage amplitude and phase of the large power grid;
2) calculating voltage amplitude difference and phase deviation between the light storage power generation system and a large power grid;
3) and controlling the UPFC to inject compensation voltage into the grid-connected node by taking the voltage amplitude difference and the phase deviation as compensation targets, so as to realize grid connection of the optical storage power generation system and the large power grid.
The invention has the beneficial effects that: according to the invention, the UPFC can be used for controlling the characteristic of the line node voltage, and phase modulation of the grid-connected node voltage can be carried out according to the amplitude deviation and the phase deviation of the voltage of the optical storage power generation system and the voltage of the large power grid, so that the grid-connected node voltage and the voltage of the large power grid are kept synchronous, soft landing of the optical storage power generation system connected to the large power grid is realized, grid-connected impact risk is reduced, seamless and flexible parallel and disconnection of the optical storage power generation system and the large power grid can be realized, and the safety and reliability of system operation are ensured.
Further, in order to better realize synchronous grid connection; the specific process of the step 3) is as follows: controlling the UPFC to take voltage amplitude difference and phase deviation as compensation targets, injecting compensation voltage into a grid-connected node, judging whether the phase of the optical storage power generation system is equal to that of a large power grid when the voltage amplitude of the optical storage power generation system is equal to that of the large power grid, and if so, realizing grid connection of the optical storage power generation system and the large power grid; and if the voltage of the optical storage power generation system is not equal to the compensation voltage injected into the grid-connected node by the series side converter, adjusting the voltage of the optical storage power generation system and the compensation voltage of the grid-connected node by the series side converter until the voltage of the optical storage power generation system is synchronous with the voltage of the large power grid, wherein the compensation voltage of the UPFC is zero, the grid connection of the optical storage power generation system and the large power grid is realized, and at the moment, the off-grid main power.
The invention also provides a flexible grid-connected device of the optical storage power generation system based on the UPFC, which comprises a processor and a memory, wherein the processor is used for executing instructions stored in the memory to realize the following method:
1) collecting the voltage amplitude and phase of the light storage power generation system and the voltage amplitude and phase of the large power grid;
2) calculating voltage amplitude difference and phase deviation between the light storage power generation system and a large power grid;
3) and controlling the UPFC to inject compensation voltage into the grid-connected node by taking the voltage amplitude difference and the phase deviation as compensation targets, so as to realize grid connection of the optical storage power generation system and the large power grid.
The invention has the beneficial effects that: the invention utilizes the characteristic that the UPFC can control the line node voltage and can perform phase modulation on the node voltage according to the amplitude deviation and the phase deviation of the voltage of the optical storage power generation system and the voltage of the large power grid, so that the synchronization of the grid-connected node voltage and the voltage of the large power grid is kept, the soft landing of the optical storage power generation system connected to the large power grid is realized, the grid-connected impact risk is reduced, seamless and flexible parallel and disconnection between the optical storage power generation system and the large power grid can be realized, and the safety and the reliability of the system operation are ensured.
Further, in order to better realize synchronous grid connection; the specific process of the step 3) is as follows: controlling the UPFC to take voltage amplitude difference and phase deviation as compensation targets, injecting compensation voltage into a grid-connected node, judging whether the phase of the optical storage power generation system is equal to that of a large power grid when the voltage amplitude of the optical storage power generation system is equal to that of the large power grid, and if so, realizing grid connection of the optical storage power generation system and the large power grid; and if the voltage of the optical storage power generation system is not equal to the compensation voltage injected into the grid-connected node by the series side converter, adjusting the voltage of the optical storage power generation system and the compensation voltage of the grid-connected node by the series side converter until the voltage of the optical storage power generation system is synchronous with the voltage of the large power grid, wherein the compensation voltage of the UPFC is zero, the grid connection of the optical storage power generation system and the large power grid is realized, and at the moment, the off-grid main power.
Drawings
FIG. 1 is a flexible grid-connected system of a UPFC-based optical storage power generation system of the invention;
FIG. 2 is a flow chart of a flexible grid connection method of the UPFC-based optical storage power generation system;
FIG. 3 is a voltage vector diagram of the UPFC-based flexible grid connection method for the optical storage power generation system;
fig. 4 is a waveform schematic diagram of the flexible grid connection method of the optical storage power generation system based on the UPFC.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Method embodiment
Fig. 1 is a flexible grid-connected system of a light storage power generation system based on UPFC, which includes a light storage power generation system, UPFC and a large power grid; the optical storage power generation system comprises a load, a photovoltaic array and an energy storage system; the load, the photovoltaic array and the energy storage system are connected with the direct current bus; the UPFC comprises a parallel side converter 1, a series side converter 2, a series transformer, a parallel transformer and a direct current capacitor, wherein the two converters are connected with a direct current capacitor C in parallel.
The parallel side converter 1 is connected with an alternating current bus of the optical storage power generation system through a parallel transformer, the parallel side converter 1 is mainly used for controlling the direct current voltage of a direct current capacitor C to keep stable and providing active power for the work of a series side converter 2 of the UPFC, and the parallel side converter is represented as a controlled current source; the series-side converter 2 is connected to a large power grid bus through a series-side transformer, and is mainly used for injecting compensation voltage into a line, and synchronizing grid-connected node voltage and large power grid voltage through controlling the compensation voltage, so that grid connection of the optical storage power generation system is achieved.
In this embodiment, before the optical storage power generation system is connected to the large power grid, the grid-connected circuit breaker is disconnected, that is, the voltage of the grid-connected node is not equal to the voltage of the large power grid, where the voltage includes a voltage amplitude and a phase; in the grid connection process, compensating voltage is injected into a circuit through a series side converter 2 of the UPFC, the compensating voltage is adjusted until the voltage amplitude of a grid connection node is equal to the voltage amplitude of the large power grid, whether the phase of the optical storage power generation system is equal to the phase of the large power grid or not is judged, if not, a grid connection breaker is closed, and indirect grid connection is achieved; if the phase of the light storage power generation system is equal to that of the large power grid, the grid-connected circuit breaker is closed, and direct grid connection is achieved.
Specifically, as shown in fig. 2, the flexible grid connection method for the optical storage power generation system based on the UPFC includes the following steps:
1) collecting the voltage amplitude and phase of the light storage power generation system and the voltage amplitude and phase of the large power grid;
2) calculating voltage amplitude difference and phase deviation between the light storage power generation system and a large power grid;
3) and controlling the UPFC to inject compensation voltage into the grid-connected node by taking the voltage amplitude difference and the phase deviation as compensation targets, so that the grid connection of the optical storage power generation system and the large power grid is realized.
In the above embodiment, because the phase of the main power voltage of the optical storage power generation system is random when the optical storage power generation system is in off-grid operation, and the optical storage power generation system does not have a condition of being immediately connected to a large power grid, the series-side converter 2 of the UPFC is required to inject compensation voltage to a grid-connected node in a line by taking the voltage amplitude difference and the phase deviation between the optical storage power generation system and the large power grid as a compensation target through the series-side converter 2, and at this time, the UPFC synchronizes with the voltage amplitude of the large power grid by adjusting the compensation voltage until the sum of the voltage amplitude of the optical storage power generation system and the compensation voltage amplitude (that is, the voltage amplitude of the grid-connected node) is equal to the voltage amplitude of the large power.
The specific UPFC adjustment process, as shown in FIG. 3, sets the compensation voltage to
The main power supply voltage of the light storage power generation system is
Grid-connected node voltage
The voltage of the large power grid is
In the present embodimentThe series-side converter 2 adjusts and outputs PWM pulses by taking the voltage amplitude difference and the phase deviation as compensation targets, and injects compensation voltage into a line grid-connected node
According to kirchhoff's law:
by making the grid-connected node voltage
Voltage amplitude of and large grid voltage
The voltage amplitudes of which are kept in synchronism, i.e. UM+UF＝UH＝UGThe light storage power generation system and the UPFC can be indirectly and flexibly merged into a large power grid.
4) When the system is indirectly connected with the grid, if direct connection is needed, the voltage of the optical storage power generation system and the compensation voltage injected into a grid connection node by the series-side converter are adjusted until the voltage of the optical storage power generation system is synchronous with the voltage of a large power grid, the compensation voltage of the UPFC is zero, direct connection is achieved, and at the moment, the off-grid main power supply in the optical storage power generation system quits operation.
Wherein, the light storage power generation system slowly debugs the voltage
Phase of the voltage of the large power grid
Since the grid-connected breaker is closed at all times
Therefore, the compensation voltage can be directly obtained according to the equation
Is changed in phaseThe UPFC changes the pulse control strategy according to the phase variation and slowly adjusts
Of the phase of (1) finally to
Thereby realizing direct grid connection; the off-grid main power supply in the light storage power generation system quits running; if direct grid connection is not needed, the main power supply in the optical storage power generation system does not need to quit operation, and the working condition at the moment is kept to continuously operate.
As shown in fig. 4, the invention provides a schematic diagram of voltage variation waveform when the optical storage power generation system based on the UPFC is flexibly connected to the grid, and grid-connected node voltage
Generating system bus voltage for light storage
Compensation voltage with UPFC injection
The voltage of the grid-connected node before the time t1
To the large grid voltage
Amplitude difference and phase deviation exist, direct grid connection cannot be achieved, and the UPFC at the time t1 compensates the change of the phase and amplitude deviation through PWM pulse control, so that grid connection node voltage
To the large grid voltage
The indirect grid connection is successful, and then the light storage power generation system is used for generating power according to the voltage of a large power grid
The self output voltage is adjusted at the time of t 2-t 4 until the two are synchronous, so that the direct grid connection success of the optical storage power generation system is realized.
Device embodiment
The invention also provides a flexible grid-connected device of the optical storage power generation system based on the UPFC, and the device can be an intelligent terminal, a control protection device and other equipment in a distribution network system; the flexible grid-connected method for the optical storage power generation system based on the UPFC comprises a processor and a memory, wherein the processor and the memory can be commercially available products, and the processor is used for executing the flexible grid-connected method for the optical storage power generation system based on the UPFC, and specific methods are described in the method embodiments described above, and are not described herein again.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), computer program products, and/or computer program instructions, which are understood to implement each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, by computer program instructions; these computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above embodiments are only used for illustrating the present invention, and the implementation steps of the method and the like can be changed, and all equivalent changes and modifications based on the technical scheme of the present invention should not be excluded from the protection scope of the present invention.
Claims (2)
1. A flexible grid connection method for a light storage power generation system based on UPFC is characterized by comprising the following steps:
1) collecting the voltage amplitude and phase of the light storage power generation system and the voltage amplitude and phase of the large power grid;
2) calculating voltage amplitude difference and phase deviation between the light storage power generation system and a large power grid;
3) controlling the UPFC to inject compensation voltage into a grid-connected node by taking the voltage amplitude difference and the phase deviation as compensation targets, and realizing grid connection of the optical storage power generation system and a large power grid;
the specific process of the step 3) is as follows: controlling the UPFC to take voltage amplitude difference and phase deviation as compensation targets, injecting compensation voltage into a grid-connected node, judging whether the phase of the optical storage power generation system is equal to that of a large power grid when the voltage amplitude of the optical storage power generation system is equal to that of the large power grid, and if so, directly connecting the optical storage power generation system and the large power grid; if the phases are not equal, closing a grid-connected breaker to realize indirect grid connection of the optical storage power generation system and the large power grid, adjusting the voltage of the optical storage power generation system and the compensation voltage injected into a grid-connected node by the series-side converter until the voltage of the optical storage power generation system is synchronous with the voltage of the large power grid to realize direct grid connection of the optical storage power generation system and the large power grid, wherein the compensation voltage of the UPFC is zero to realize grid connection of the optical storage power generation system and the large power grid, and at the moment, an off-grid main power supply in the optical storage power generation system exits from operation.
2. The flexible grid-connected device of the light storage power generation system based on the UPFC is characterized by comprising a processor and a memory, wherein the processor is used for executing instructions stored in the memory to realize the following method:
1) collecting the voltage amplitude and phase of the light storage power generation system and the voltage amplitude and phase of the large power grid;
2) calculating voltage amplitude difference and phase deviation between the light storage power generation system and a large power grid;
3) controlling the UPFC to inject compensation voltage into a grid-connected node by taking the voltage amplitude difference and the phase deviation as compensation targets, and realizing grid connection of the optical storage power generation system and a large power grid;
controlling the UPFC to take voltage amplitude difference and phase deviation as compensation targets, injecting compensation voltage into a grid-connected node, judging whether the phase of the optical storage power generation system is equal to that of a large power grid when the voltage amplitude of the optical storage power generation system is equal to that of the large power grid, and if so, directly connecting the optical storage power generation system and the large power grid; if the phases are not equal, closing a grid-connected breaker to realize indirect grid connection of the optical storage power generation system and the large power grid, adjusting the voltage of the optical storage power generation system and the compensation voltage injected into a grid-connected node by the series-side converter until the voltage of the optical storage power generation system is synchronous with the voltage of the large power grid to realize direct grid connection of the optical storage power generation system and the large power grid, wherein the compensation voltage of the UPFC is zero to realize grid connection of the optical storage power generation system and the large power grid, and at the moment, an off-grid main power supply in the optical storage power generation system exits from operation.
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| CN201479046U (en) * | 2009-08-17 | 2010-05-19 | 戴超波 | Dynamic voltage recovery system based on solar power generation and energy storage |
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