CN113241786A - Power grid access method of new energy system - Google Patents
Power grid access method of new energy system Download PDFInfo
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- CN113241786A CN113241786A CN202110534359.7A CN202110534359A CN113241786A CN 113241786 A CN113241786 A CN 113241786A CN 202110534359 A CN202110534359 A CN 202110534359A CN 113241786 A CN113241786 A CN 113241786A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000004146 energy storage Methods 0.000 claims abstract description 111
- 238000010248 power generation Methods 0.000 claims abstract description 25
- 238000004804 winding Methods 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 4
- 238000004378 air conditioning Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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
-
- 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
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Abstract
The invention discloses a power grid access method of a new energy system, wherein a power generation unit of the new energy system is accessed to a power grid through a step-up transformer, and the method comprises the following steps: a secondary winding is added on the low-voltage side of the step-up transformer, and a newly added bus is led out from the secondary winding; connecting an energy storage device on the newly added bus, and outputting alternating current voltage matched with the voltage grade of the newly added bus by using a plurality of energy storage power units connected in series in the energy storage device; and controlling the working state of the energy storage device according to the working state of the power generation unit of the new energy system so as to perform reactive compensation on the power grid. According to the power grid access method, the energy storage device can be connected with the power grid without arranging a step-up transformer, so that the equipment cost and the energy loss are saved, and the reactive compensation can be carried out on the power grid while the energy storage is realized.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a power grid access method of a new energy system.
Background
With the high-speed development of power electronic technology and the strong support of national policies, the electrochemical energy storage system is widely applied to various fields of peak regulation and frequency modulation of a thermal power plant, power fluctuation of smooth wind power and photovoltaic power generation, user-side back-up power peak regulation and the like.
Currently, in new energy projects, a conventional energy storage method is mostly adopted, that is, a plurality of clusters of battery racks are connected in parallel to a centralized low-voltage PCS (Process Control System), a plurality of centralized low-voltage PCS are connected in parallel, then the voltage is boosted by a step-up transformer, and the integrated circuit is connected through a ring main unit and finally connected to a power grid. By adopting a traditional centralized low-voltage energy storage method, 1 step-up transformer needs to be configured for each 2.5MW energy storage unit, and a reactive power compensation device and step-up equipment thereof need to be added.
The energy storage system scheme under the existing new energy scene has the following defects: 1. the conversion efficiency of the energy storage system is reduced by about 3% due to the loss generated by the transformer and the related corollary equipment which are necessary for each energy storage unit; 2. the sum of the cost of the transformer and related corollary equipment of each energy storage unit accounts for about 6% of the cost of the complete energy storage system, so that the investment cost of the energy storage power station is increased; 3. the reactive power compensation device which must be configured in the new energy project can be connected to the switch interval of the new energy bus through the transformer, and the utilization rate of the reactive power compensation device in the new energy station is not high, but very large loss is generated once the reactive power compensation device is started.
Disclosure of Invention
In view of the above problems, the present invention discloses a power grid access method for a new energy system, so as to overcome the above problems or at least partially solve the above problems.
In order to achieve the purpose, the following technical scheme is adopted in the application:
the invention discloses a power grid access method of a new energy system, wherein a power generation unit of the new energy system is accessed to a power grid through a step-up transformer, and the method comprises the following steps:
adding a secondary winding on the low-voltage side of the step-up transformer, and leading out a newly-added bus from the secondary winding;
connecting an energy storage device on the newly added bus, and outputting alternating current voltage matched with the voltage grade of the newly added bus by using a plurality of energy storage power units connected in series in the energy storage device;
and controlling the working state of the energy storage device according to the working state of the power generation unit of the new energy system so as to perform reactive compensation on the power grid.
Further, the controlling the working state of the energy storage device according to the working state of the power generation unit of the new energy system to perform reactive compensation on the power grid includes:
and a matched energy storage converter PCS and a control circuit are arranged, and the energy storage device is controlled by the control circuit and the energy storage converter PCS so as to perform reactive compensation on the power grid.
Further, the control circuit includes: signal acquisition unit and communication unit.
Further, connect energy memory on newly-increased generating line, include:
and connecting a four-quadrant cascade energy storage device on the newly added bus, and outputting alternating current voltage matched with the voltage grade of the newly added bus without boosting through a transformer by the four-quadrant cascade energy storage device.
Further, the method further comprises:
and setting the voltage grade of the newly added bus to be 6kV or 10 kV.
Further, the method further comprises:
and controlling each phase of the four-quadrant cascade type energy storage device to be connected with 12-24 same energy storage power units in series so as to correspondingly output a phase voltage of 6kV or 10 kV.
Further, the method further comprises:
and configuring independent battery clusters for each energy storage power unit of the four-quadrant cascade energy storage device, so that the battery clusters are not connected in parallel to improve the consistency of the battery clusters.
Further, the method further comprises:
and configuring a filter capacitor for each battery cluster, wherein the filter capacitor is connected with the battery clusters in parallel.
Further, the method further comprises:
and arranging reactors on the output end links of each phase of the four-quadrant cascade energy storage device.
Further, the method further comprises:
the energy storage device is provided with one or more of a fire protection device, a ventilation device, an air conditioning device, a lighting device and a fire protection device.
To sum up, the beneficial effect of this application is:
compared with the prior art that the energy storage device is connected with the power grid by arranging an additional boosting transformer, the power grid access method can realize grid connection only by arranging the secondary winding in the original boosting transformer, and omits the arrangement of the additional boosting transformer. In addition, the energy storage device can directly output the phase voltage with the same voltage grade as the newly added bus, so that a transformer and related equipment of the transformer are not required to be arranged between the energy storage device and the newly added bus, and the efficiency of overall energy transfer is improved. According to the power grid access method, the number of used transformers is small, the cost of energy storage equipment is saved, the energy loss of the whole device is reduced, and the occupied area of the whole device is reduced. Meanwhile, the power grid access method can realize reactive compensation on the power grid, and configuration of a reactive compensation device is omitted.
Drawings
Fig. 1 is a diagram illustrating implementation steps of a power grid access method of a new energy system according to an embodiment of the present application;
fig. 2 is a connection structure diagram of a new energy system grid connection provided in an embodiment of the present application;
fig. 3 is a connection structure diagram of an energy storage device according to an embodiment of the present application;
fig. 4 is a diagram of a connection structure of an energy storage power unit according to an embodiment of the present application.
In the figure: 1. a power generation unit; 2. a step-up transformer; 3. a secondary winding; 4. newly adding a bus; 5. an energy storage device; 6. an energy storage power unit; 7. a power conversion circuit; 8. a battery cluster; 9. a filter capacitor; 10. a reactor.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The invention discloses a power grid access method of a new energy system, wherein a power generation unit 1 of the new energy system is accessed to a power grid through a step-up transformer 2, wherein the power generation unit 1 is a new energy power generation device, such as a device for realizing power generation through solar energy, biomass energy, wind energy, geothermal energy, wave energy, ocean current energy or tidal energy and the like. As shown in fig. 1, the power grid access method includes:
And 2, connecting an energy storage device on the newly added bus, and outputting alternating current voltage matched with the voltage grade of the newly added bus by using a plurality of energy storage power units connected in series in the energy storage device.
And 3, controlling the working state of the energy storage device according to the working state of the power generation unit of the new energy system so as to perform reactive compensation on the power grid.
Fig. 2 is a connection structure diagram of a new energy system grid connection provided in an embodiment of the present application, as shown in fig. 2, a secondary winding 3 is added on a low-voltage side of a step-up transformer 2, and a new bus 4 is led out from the secondary winding 3; the secondary winding 3 is coupled with a grid side winding of the step-up transformer 2, namely the step-up transformer 2 internally comprises the grid side winding, a valve side winding and the secondary winding 3, the grid side winding is connected with a power grid, and the valve side winding is connected with the power generation unit 1. For example, the newly added bus 4 is a 10kV bus, the step-up transformer 2 is a 10-15MVA transformer, the primary side rated voltage of the step-up transformer 2 is 110kV or even higher, and the secondary side rated voltage is 35kV \10kV respectively.
The energy storage device 5 is connected to the newly added bus 4, as shown in fig. 3, each phase of the energy storage device 5 includes a plurality of energy storage power units 6 connected in series, the structure and the electrical performance of the energy storage power units 6 are completely consistent, and the energy storage device 5 can output alternating voltage matched with the voltage grade of the newly added bus 4 through the energy storage power units 6 connected in series. Therefore, a step-up transformer is not needed to be arranged between the energy storage power unit 6 and the newly added bus 4.
According to the working state of the power generation unit 1 of the new energy system, the energy storage power unit 6 of the energy storage device 5 is controlled to work so as to perform reactive compensation on the power grid, and the method specifically comprises the following steps: by monitoring the power generation unit 1, the energy storage device 5 performs reactive compensation on the power grid through the secondary winding 3 according to the state of the power generation unit 1; when the output power of the power generation unit 1 is higher than the rated power and the voltage is overhigh, the electric energy in the power grid flows to the energy storage device 5 through the secondary winding 3 and the newly added bus 4, so that the storage of the redundant electric energy is realized, and the voltage of the power grid is further reduced; when the output power of the power generation unit 1 is lower than the rated power and the voltage is too low, the electric energy in the energy storage device 5 flows to the power grid through the newly added bus 4 and the secondary winding 3, so that the electric energy compensation of the power grid is realized, and the voltage of the power grid is further improved. Specifically, the energy storage device 5 includes three energy storage power links, which are an a phase, a B phase, and a C phase, and each energy storage power link is connected in series with a plurality of energy storage power units 6.
In summary, in the power grid access method of this embodiment, the energy storage device is directly connected to the secondary winding added to the low-voltage side of the step-up transformer through the newly added bus, each phase of the energy storage device includes a plurality of energy storage power units connected in series, and can directly output three-phase alternating current whose voltage level matches the voltage level of the newly added bus to the power grid. In addition, the energy storage device can directly output the phase voltage with the same voltage grade as the newly added bus, so that a transformer and related equipment of the transformer are not required to be arranged between the energy storage device and the newly added bus, and the efficiency of overall energy transfer is improved. According to the power grid access method, the number of used transformers is small, the cost of energy storage equipment is saved, the energy loss of the whole device is reduced, and the occupied area of the whole device is reduced. Meanwhile, the power grid access method can realize reactive compensation on the power grid, and configuration of a reactive compensation device is omitted.
In one embodiment, in step 3, controlling the operating state of the energy storage device according to the operating state of the power generation unit of the new energy system to perform reactive power compensation on the power grid includes:
a matched energy storage converter PCS (Process Control System) and a Control circuit are arranged, and the energy storage device is controlled through the Control circuit and the energy storage converter PCS to perform reactive power compensation on the power grid. The control circuit can monitor the power generation unit in real time, the energy storage converter PCS outputs corresponding PWM (Pulse Width Modulation) voltage waveform according to a monitoring result, the energy storage power unit is regulated and controlled, and reactive power compensation is performed on a power grid.
Preferably, the control circuit comprises: the power generation device comprises a signal acquisition unit and a communication unit, wherein the signal acquisition unit is used for detecting a power generation unit, and the communication unit is used for communicating with a signal between the energy storage converter PCS.
In one embodiment, in step 2, connecting an energy storage device to the newly added bus includes:
the four-quadrant cascade type energy storage device is connected to the newly added bus, and alternating current voltage matched with the voltage grade of the newly added bus is output through the four-quadrant cascade type energy storage device without boosting through a transformer, so that the construction cost of the energy storage device is saved.
In one embodiment, the grid access method further comprises:
and setting the voltage class of the newly added bus to be 6kV or 10 kV. Of course, the newly added bus can be in other voltage classes according to the requirement.
In one embodiment, the grid access method further comprises:
as shown in fig. 3, in order to enable the four-quadrant cascade energy storage device to directly output the phase voltage with the same voltage level as the newly added bus, each phase of the four-quadrant cascade energy storage device is controlled to be connected in series with 12 to 24 identical energy storage power units 6 so as to correspondingly output the phase voltage of 6kV or 10 kV.
The output voltage for controlling the four-quadrant cascade energy storage device is formed by the output voltage shift of a plurality of energy storage power units 6 and superposition, and the voltage waveform close to a sine wave can be output without setting filtering.
In a preferred embodiment, the grid access method further comprises:
as shown in fig. 4, an independent battery cluster 8 and a power conversion circuit 7 are configured for each energy storage power unit of the four-quadrant cascade energy storage device, so that there is no parallel connection between the battery clusters 8 to improve the consistency of the battery clusters 8.
The direct current side ports of the power conversion circuits 7 are connected with the corresponding battery clusters 8, the alternating current side ports of the power conversion circuits 7 are connected in series, each power conversion circuit 7 and one battery cluster 8 form a loop, parallel connection between the battery clusters 8 and the battery clusters 8 is reduced or even avoided, and because the single battery cluster 8 does not influence the charging and discharging conditions of other battery clusters 8, the consistency of the battery clusters 8 is greatly improved, the available capacity of the energy storage device is improved, and the service life of the battery clusters 8 is prolonged.
As shown in fig. 4, the power conversion circuit 7 includes: an H-bridge consisting of an Insulated Gate Bipolar Transistor (IGBT). The specific connection of the power conversion circuit is as follows: the collector of the first IGBT Q1 is connected with the positive electrode of the direct current port of the energy storage power unit 6, the emitter of the first IGBT Q1 is connected with the collector of the second IGBT Q2, the emitter of the second IGBT Q2 is connected with the negative electrode of the direct current port of the energy storage power unit 6 to form a first bridge arm of an H bridge, the emitter of the third IGBT Q3 is connected with the collector of the fourth IGBT Q4 to form a second bridge arm of the H bridge, and the first bridge arm and the second bridge arm are connected in parallel. The energy storage converter PCS regulates and controls the energy storage power unit 6 through the power conversion circuit 7, and realizes charging and discharging of the battery cluster 8.
Preferably, the power grid access method further comprises:
as shown in fig. 4, a filter capacitor 9 is configured for each battery cluster 8, and the filter capacitor 9 is connected in parallel with the battery cluster 8 and is used for filtering out ac components and smoothing dc output by the battery cluster 8.
In one embodiment, the grid access method further comprises:
as shown in fig. 3, a reactor 10 is provided on each phase output end link of the four-quadrant cascade energy storage device, and the reactor 10 mainly plays a role in current limiting and filtering.
In one embodiment, the grid access method further comprises:
one or more of a fire protection device, a ventilation device, an air conditioning device, a lighting device and a fire fighting device are configured for the energy storage device, so that the work of the energy storage device is assisted. Of course, other auxiliary devices may be configured for the energy storage device to ensure smooth operation and maintenance of the energy storage device.
While the foregoing is directed to embodiments of the present invention, other modifications and variations of the present invention may be devised by those skilled in the art in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present invention, and the scope of the present invention should be determined by the scope of the appended claims.
Claims (10)
1. A power grid access method of a new energy system is characterized in that a power generation unit of the new energy system is accessed to a power grid through a step-up transformer, and the method comprises the following steps:
adding a secondary winding on the low-voltage side of the step-up transformer, and leading out a newly-added bus from the secondary winding;
connecting an energy storage device on the newly added bus, and outputting alternating current voltage matched with the voltage grade of the newly added bus by using a plurality of energy storage power units connected in series in the energy storage device;
and controlling the working state of the energy storage device according to the working state of the power generation unit of the new energy system so as to perform reactive compensation on the power grid.
2. The grid access method according to claim 1, wherein the controlling the operating state of the energy storage device according to the operating state of the power generation unit of the new energy system to perform reactive compensation on the grid comprises:
and a matched energy storage converter PCS and a control circuit are arranged, and the energy storage device is controlled by the control circuit and the energy storage converter PCS so as to perform reactive compensation on the power grid.
3. The grid access method of claim 2, wherein the control circuit comprises: signal acquisition unit and communication unit.
4. The grid access method according to claim 1, wherein connecting an energy storage device to the newly added bus comprises:
and connecting a four-quadrant cascade energy storage device on the newly added bus, and outputting alternating current voltage matched with the voltage grade of the newly added bus without boosting through a transformer by the four-quadrant cascade energy storage device.
5. The grid access method according to claim 4, further comprising:
and setting the voltage grade of the newly added bus to be 6kV or 10 kV.
6. The grid access method according to claim 5, further comprising:
and controlling each phase of the four-quadrant cascade type energy storage device to be connected with 12-24 same energy storage power units in series so as to correspondingly output a phase voltage of 6kV or 10 kV.
7. The grid access method according to claim 4, further comprising:
and configuring independent battery clusters for each energy storage power unit of the four-quadrant cascade energy storage device, so that the battery clusters are not connected in parallel to improve the consistency of the battery clusters.
8. The grid access method according to claim 7, further comprising:
and configuring a filter capacitor for each battery cluster, wherein the filter capacitor is connected with the battery clusters in parallel.
9. The grid access method according to claim 4, further comprising:
and arranging reactors on the output end links of each phase of the four-quadrant cascade energy storage device.
10. The grid access method according to any one of claims 1-9, wherein the method further comprises:
the energy storage device is provided with one or more of a fire protection device, a ventilation device, an air conditioning device, a lighting device and a fire protection device.
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