CN210724217U - Auxiliary frequency modulation device and energy storage frequency modulation system - Google Patents
Auxiliary frequency modulation device and energy storage frequency modulation system Download PDFInfo
- Publication number
- CN210724217U CN210724217U CN201920848898.6U CN201920848898U CN210724217U CN 210724217 U CN210724217 U CN 210724217U CN 201920848898 U CN201920848898 U CN 201920848898U CN 210724217 U CN210724217 U CN 210724217U
- Authority
- CN
- China
- Prior art keywords
- energy storage
- unit
- power
- power conversion
- storage system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004146 energy storage Methods 0.000 title claims abstract description 143
- 238000006243 chemical reaction Methods 0.000 claims description 83
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000012545 processing Methods 0.000 claims description 16
- 238000009499 grossing Methods 0.000 claims description 7
- 230000033001 locomotion Effects 0.000 claims description 4
- 230000010349 pulsation Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 10
- 230000001174 ascending effect Effects 0.000 abstract description 5
- 230000005158 plant movement Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model provides an auxiliary frequency modulation device and energy storage frequency modulation system, auxiliary frequency modulation device, include: the system comprises a high-voltage energy storage system and an energy management system, wherein a bus access end of the high-voltage energy storage system is connected with an auxiliary power bus of a unit in a plant, the energy management system controls the output power of the high-voltage energy storage system according to an AGC (automatic gain control) instruction sent by a control unit of the unit in the plant, the actual output power and the running state of the unit in the plant and the running state of the high-voltage energy storage system, and when the AGC instruction is a load ascending/descending instruction, the high-voltage energy storage system is controlled to correspondingly discharge/charge. Through changing the connected mode of energy storage system and high-voltage bus to realize under the condition that does not use the transformer, energy storage system and thermal power plant internal unit can carry out high-efficient safe combined operation, and this connected mode can effectively shorten response time, improve regulation rate and reduce cost.
Description
Technical Field
The utility model relates to a thermoelectricity technical field, concretely relates to supplementary frequency modulation device and energy storage frequency modulation system.
Background
The thermal power generating unit supplies power to a power grid by burning coal, and in practical application, the thermal power generating unit and an energy storage system are combined to form an energy storage frequency modulation system for use, so that corresponding action can be performed after an Automatic Generation Control (AGC) instruction from the power grid is received, and the actual power of the thermal power generating unit is ensured to follow the AGC instruction of the power grid.
However, in the existing energy storage frequency modulation system, the energy storage system must be boosted through the transformer and then can be connected to the high-voltage substation bus of the in-plant unit for use, and the connection mode can prolong the response time of the AGC instruction, reduce the speed and the accuracy of adjustment and increase the cost.
SUMMERY OF THE UTILITY MODEL
In view of this, (one) the utility model aims at providing an auxiliary frequency modulation device and energy storage system to alleviate among the current energy storage frequency modulation system energy storage system must step up the back through the transformer and just can insert the interior unit high pressure factory of factory and become to use on the generating line and use, the technical problem of extension response time, incremental cost etc..
(II) technical scheme
In order to solve the technical problem, the embodiment of the utility model discloses an auxiliary frequency modulation device, include: the system comprises a high-voltage energy storage system and an energy management system, wherein a bus access end of the high-voltage energy storage system is connected with an auxiliary power bus of a unit in a plant, an output end of the energy management system is connected with a control end of the high-voltage energy storage system, an input end of the energy management system is connected with an output end of a unit control unit in the thermal power plant, the energy management system controls output power of the high-voltage energy storage system according to an AGC (automatic gain control) instruction sent by the unit control unit in the plant, actual output power and running state of the unit in the plant and running state of the high-voltage energy storage system, and when the AGC instruction is a load ascending/descending instruction, the high-voltage energy storage system is controlled to correspondingly discharge/charge.
Further, the high-voltage energy storage system comprises: the power conversion unit controller and three power conversion branches are connected with a three-phase power grid;
the output end of the energy management system is connected with the input end of the power conversion unit controller, and the three output ends of the power conversion unit controller are respectively connected with the three power conversion branches;
and the energy management system sends power control instructions to the three power conversion branches through the power conversion unit controller so as to control the output power of each power conversion branch.
Further, the power conversion branch comprises: a plurality of power conversion modules connected in series with each other.
Further, the power conversion module includes: the power conversion unit and the energy storage unit are connected in series; and the power conversion unit controller controls the output power of each power conversion unit according to an output power instruction sent by the energy management system.
Further, the power conversion unit includes a power conversion circuit and a filter circuit, which are connected in series.
Further, the power conversion circuit is arranged as a single-phase H-bridge circuit.
Further, the filter circuit comprises a direct current flat filter capacitor and a direct current filter reactor;
the direct-current flat filter capacitor is connected with the single-phase H-bridge circuit in parallel and used for smoothing voltage fluctuation on a direct-current bus;
the direct-current filter reactor is connected in series to the direct-current port side of the single-phase H-bridge circuit and used for reducing double-frequency pulsation together with the direct-current flat filter capacitor and smoothing output current of the energy storage unit.
Further, the power conversion unit controller comprises a decoding module, a signal processing module and a driving circuit;
the input end of the decoding module is connected with the output end of the controller of the energy management system, and the decoding module receives a control command sent by the controller of the energy management system;
the output end of the decoding module is connected with the input end of the signal processing module, and the decoding module decodes the control command and sends the decoded control command to the signal processing module;
the output end of the signal processing module is connected with the input end of the driving circuit, and the signal processing module sends the decoded control command to the driving circuit;
the output end of the driving circuit is connected with the input end of the power conversion circuit, and the control command controls the power conversion unit through a driving signal generated by the driving circuit.
Furthermore, the high-voltage energy storage system further comprises three grid-connected reactor branches, and the three grid-connected reactor branches are connected to one end, close to the three-phase power grid, of the three power conversion branches and used for current limiting and filtering.
The embodiment of the utility model provides a still disclose an energy storage frequency modulation system, include: the system comprises an auxiliary frequency modulation device, a unit in a thermal power plant and a power plant movement device, wherein the power plant movement device is connected with the auxiliary frequency modulation device through a control unit of the unit in the plant and used for receiving an AGC instruction sent by remote scheduling and sending the AGC instruction to a unit control unit in the plant, and simultaneously feeding back the combined output of the unit in the plant and a high-voltage energy storage system to the remote scheduling.
(III) the beneficial effects are as follows:
compared with the prior art, the utility model, following beneficial effect has:
the utility model discloses in through the connected mode who changes energy storage system and high-voltage bus, thereby realize under the condition that does not use the transformer, energy storage system and thermal power plant internal unit can carry out high-efficient safe combined operation, thereby respond the AGC instruction that long-range dispatch sent, this connected mode can effectively shorten response time, improve regulation rate and regulation precision when guaranteeing reduce cost, and then steady load, reduce the internal unit wearing and tearing of factory, promote the regulation performance of internal unit of factory by a wide margin.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an energy storage frequency modulation system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of the high-voltage energy storage system according to the embodiment of the present invention;
fig. 3 is another schematic structural diagram of the high-voltage energy storage system according to the embodiment of the present invention;
fig. 4 is a schematic circuit diagram illustrating a power conversion unit according to an embodiment of the present invention;
fig. 5 is a circuit diagram illustrating a power conversion circuit according to an embodiment of the present invention;
fig. 6 is a block diagram illustrating a control process of the power conversion unit controller to the control unit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an energy storage frequency modulation system according to another embodiment of the present invention.
In the figure: 1. a high voltage energy storage system; 2. an energy management system; 3. a control unit; 4. a power conversion unit controller; 5. a three-phase power grid; 6. a power conversion branch; 7. a power conversion unit; 8. an alternating current port; 9. a DC port; 10. an energy storage unit; 11. a power conversion circuit; 12. a direct current flat filter capacitor; 13. a direct current filter reactor; 14. a decoding module; 15. a signal processing module; 16. a drive circuit; 17. a grid-connected reactor branch circuit; 18. a power plant motion device.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
As shown in fig. 1, the utility model provides an auxiliary frequency modulation device, include: the system comprises a high-voltage energy storage system 1 and an energy management system 2, wherein a bus access end of the high-voltage energy storage system 1 is connected with an auxiliary power bus of a unit in a plant, an output end of the energy management system 2 is connected with a control end of the high-voltage energy storage system 1, an input end of the energy management system 2 is connected with an output end of a unit control unit 3 in the thermal power plant, the energy management system 2 controls the output power of the high-voltage energy storage system 1 according to an AGC (automatic gain control) instruction sent by the unit control unit 3 in the plant, the actual output power and the running state of the unit in the plant and the running state of the high-voltage energy storage system 1, and when the AGC instruction is a load ascending/descending instruction, the high-voltage energy storage system 1 is controlled to correspondingly discharge/charge so as to realize; therefore, under the condition that a transformer is not used, the unit in the thermal power plant performs efficient and safe combined operation to respond to an AGC (automatic gain control) instruction sent by remote scheduling, and the connection mode can effectively shorten the response time, improve the regulation rate and the regulation precision while ensuring the cost reduction, further stabilize the load, reduce the abrasion of the unit in the plant and improve the working efficiency.
Wherein, high-pressure energy storage system 1 is the utility model provides an energy storage equipment has mainly contained the secondary battery of electrochemical medium such as lithium cell, lead-acid batteries, lead-carbon battery, the utility model discloses a high-pressure energy storage system 1 can be above-mentioned battery, also can be that the above-mentioned battery more than two kinds uses in mixture, the utility model discloses do not limit very much here, can realize the utility model discloses a purpose can, wherein three-phase electric wire netting 5's voltage level can be three-phase 6kv, 10kv to 35kv, can also can draw the electric energy from high-pressure energy storage system 1 for high-pressure energy storage system 1 power supply.
As shown in fig. 2 and 3, the high-voltage energy storage system 1 includes: the power conversion unit controller 4 and three power conversion branches 6 connected with a three-phase power grid 5;
the output end of the energy management system 2 is connected with the input end of the power conversion unit controller 4, and three output ends of the power conversion unit controller 4 are respectively connected with three power conversion branches 6;
the energy management system 2 sends power control commands to the three power conversion branches 6 through the power conversion unit controller 4 to control the output power of each power conversion branch 6.
The power conversion branch 6 includes: a plurality of power conversion modules connected in series with each other.
Wherein, the power conversion module includes: the power conversion unit 7 and the energy storage unit 10 are connected in series; the power conversion unit controller 4 controls the output power of each power conversion unit 7 according to an output power command issued by the energy management system 2.
Specifically, a plurality of groups of power conversion unit 7 are established ties each other through exchanging port 8, and a plurality of groups of power conversion unit 7's direct current port 9 is independent each other, and be connected with an energy storage unit 10 respectively, wherein, the quantity of the power conversion unit 7 of every power conversion branch road 6 is relevant with the data such as the electric wire netting voltage grade of inserting, and the voltage is higher, and the power conversion unit 7 that inserts is in large quantity more, namely directly proportional relevant, wherein, energy storage unit 10 can be for lithium iron phosphate battery or ternary lithium cell, also can be other types's electrochemistry energy storage unit, the utility model discloses do not limit very here, can realize the utility model discloses the purpose can.
In an embodiment of the present invention, the power conversion unit 7 includes a power conversion circuit 11 and a filter circuit, and the power conversion circuit 11 and the filter circuit are connected in series.
Specifically, as shown in fig. 5, the power conversion circuit 11 is a single-phase H-bridge circuit composed of power conversion devices, and the power conversion circuit 11 is constructed by adopting a fully-controlled power electronic device IGBT, as shown in fig. 3, the power conversion circuit 11 includes four IGBTs, a collector of the IGBT1 is connected with an anode of the dc port Ud9 of the power conversion unit 7, and an emitter is connected with a collector of the IGBT2, so as to form a first arm of the H-bridge; an emitter of the IGBT2 is connected with a negative electrode of the direct current port Ud9, and an emitter of the IGBT3 is connected with a collector of the IGBT4 to form a second bridge arm of the H bridge; the second bridge arm is connected with the first bridge arm in parallel to form an H bridge, an outgoing line of a connecting line of the IGBT1 and the IGBT2 in the first bridge arm serves as one end of an alternating current port Ua8 of the power conversion unit 7, and an outgoing line of a connecting line of the IGBT3 and the IGBT4 in the second bridge arm serves as the other end of an alternating current port Ua 8;
when the single-phase H-bridge circuit of this embodiment is constructed by using IGBTs, twice the overload current capability needs to be considered when the devices are selected, the IGBTs of each path may use a single tube, or may use a parallel connection mode according to the capacity requirement, fig. 3 illustrates that a single tube mode is used, and at this time, the current sharing problem caused by parallel connection of the devices does not need to be considered, so the current sharing coefficient is 1, and the design can be performed according to the twice current margin; when the parallel connection mode is adopted, the current margin needs to be designed in consideration of the current sharing problem.
In this embodiment, the maximum voltage borne by the IGBT of the single-phase H-bridge circuit is the voltage of the dc bus, that is, the maximum terminal voltage of the energy storage unit 10, considering that the energy storage unit 10 cannot be connected with too many batteries in series, and when each path works, the allowed dc voltage generally does not exceed 800V, considering that an instantaneous voltage spike exists on the dc bus, and the type selection design of the IGBT can be performed according to a doubled voltage margin.
The filter circuit comprises a direct current flat filter capacitor 12 and a direct current filter reactor 13;
the direct-current flat filter capacitor 12 is connected in parallel with the single-phase H-bridge circuit and used for smoothing voltage fluctuation on a direct-current bus;
the direct current filter reactor 13 is connected in series to the direct current port 9 side of the single-phase H-bridge circuit, and is used together with the direct current flat filter capacitor 12 to reduce the double-frequency pulsation and smooth the output current of the energy storage unit 10.
The direct-current flat plate filter capacitor 12 is used for smoothing voltage fluctuation on a direct-current bus, when the high-voltage energy storage system 1 needs to adjust reactive power, the direct-current flat plate filter capacitor 12 becomes a carrier of reactive power exchange, reactive power flowing between the three-phase power grid 5 and the energy storage unit 10 is avoided, in the embodiment, model selection of the direct-current flat plate filter capacitor 12 is performed according to voltage, current and capacitance values, if the normal working voltage of the direct-current bus is within 800V, design is performed according to a double voltage margin, the rated voltage of the direct-current flat plate filter capacitor 12 is higher than 960V, and in order to ensure that short-time overvoltage occurs due to abnormal voltage of the direct-current bus, the direct-current flat plate filter capacitor 12 has short-time overvoltage capacity; when the output of the energy storage and conversion system is reactive current, the direct current side current of the energy storage and conversion system is provided by the direct current flat filter capacitor 12, and if the design is carried out according to the current margin of 1.5 times, the capacitance value of the direct current flat filter capacitor 12 is selected according to the requirement of suppressing the direct current ripple.
The dc filter reactor 13 and the dc flat filter capacitor 12 are used together to reduce the double frequency pulsation, smooth the output current of the energy storage unit 10, improve the working conditions of the energy storage unit 10, and ensure that the service life of the energy storage unit 10 meets the design requirements. In this embodiment, the type of the dc filter reactor 13 is selected according to the voltage, the current and the inductance value, the maximum voltage that may occur in the dc filter reactor 13 is that the polarity of the energy storage unit 10 is reversed, and at this time, the voltage of the dc flat filter capacitor 12 and the voltage of the energy storage unit 10 are borne by the dc filter reactor;
if the dc filter reactors 13 are distributed, as shown in fig. 4, a dc filter reactor 13 is connected in series to each of the positive connection line and the negative connection line of the dc port 9 of the single-phase H-bridge circuit, and at this time, the withstand voltage of each dc filter reactor 13 can be appropriately lowered; when the output current of the energy storage converter system is active current, the direct current side current of the energy storage converter is basically provided by the energy storage unit 10, and the current needs to flow through the direct current filter reactor 13, so the current of the direct current filter reactor 13 can be considered according to the alternating current side current, and a certain margin can be designed according to 150A considering that the current of the direct current filter reactor 13 is not lower than the rated current.
In the present embodiment, in order to reduce the current component of 100Hz or more flowing into the energy storage unit 10, the inductance value of the dc filter reactor 13 is designed to be larger, as 2mH, and as shown in fig. 4, the dc flat filter capacitor 12 and the dc filter reactor 13 of 1mH are respectively mounted on the positive and negative bus bars of the dc bus bar, so as to obtain a better smoothing effect.
As shown in fig. 6, the power conversion unit controller 4 includes a decoding module 14, a signal processing module 15, and a driving circuit 16;
the input end of the decoding module 14 is connected with the output end of the controller of the energy management system 2, and the decoding module 14 receives a control command sent by the controller of the energy management system 2;
the output end of the decoding module 14 is connected with the input end of the signal processing module 15, and the decoding module 14 decodes the control command and sends the decoded control command to the signal processing module 15;
the output end of the signal processing module 15 is connected with the input end of the driving circuit 16, and the signal processing module 15 sends the decoded control command to the driving circuit 16;
the output terminal of the driving circuit 16 is connected to the input terminal of the power conversion circuit 11, and the control command controls the power conversion unit 7, that is, controls the IGBT of the single-phase H-bridge circuit, by the driving signal generated by the driving circuit 16.
The utility model discloses an in one embodiment, high pressure energy storage system 1 still includes three reactor branch circuits of being incorporated into the power networks 17, and three reactor branch circuits of being incorporated into the power networks 17 of being incorporated into the power networks are connected and are close to the one end of three-phase electric wire netting 5 in three power transformation branch circuits 6 for current limiting and filtering.
Specifically, the direct current side of the power conversion unit 7 is connected with the energy storage unit 10, the alternating current side is connected in series, and then the high-voltage power grid is directly connected through the grid-connected reactor branch 17, so that the transformer-free high-voltage direct-hanging type large-scale electrochemical energy storage is realized, the cost is reduced, and the electric energy conversion efficiency is improved.
As shown in fig. 1, an energy storage frequency modulation system includes an auxiliary frequency modulation device, a unit in a thermal power plant, and a power plant movement device 18, where the power plant movement device 18 is connected with the auxiliary frequency modulation device through a control unit 3 of the unit in the plant, and the power plant movement device 18 is a remote measurement and control terminal and a measurement and control device, and is configured to receive an AGC instruction sent by remote scheduling and send the AGC instruction to the control unit 3 of the unit in the plant, and simultaneously feed back a combined output of the unit in the plant and the high-voltage energy storage system 1 to the remote scheduling.
In an embodiment of the present invention, as shown in fig. 1, the station transformer is a dual-winding transformer, the winding type is determined by the actual use of the power plant, and there is no limitation, the high-voltage energy storage system 1 is directly connected to the station bus of the station unit, so as to realize that the unit in the power plant performs the AGC instruction sent by the high-efficiency and safe joint operation response remote scheduling without using the transformer, and this connection mode can effectively shorten the response time, improve the adjustment rate and the adjustment precision while ensuring the cost reduction, thereby stabilizing the load, reducing the wear of the station unit in the power plant, and improving the working efficiency, the energy management system 2 is respectively connected to the high-voltage energy storage system 1 and the control unit 3 of the unit in the power plant, and the AGC instruction sent by the high-voltage energy storage system 1 and the control unit 3 of the station unit in the power plant, the actual output and the operating state of the station unit in, And the high-voltage energy storage system 1 is in an operating state, the output power of the high-voltage energy storage system 1 is controlled, and when the AGC instruction is a load ascending/descending instruction, the high-voltage energy storage system 1 correspondingly performs discharging/charging so as to realize that the high-voltage energy storage system 1 is combined with an in-plant unit to quickly respond to the AGC instruction;
specifically, the operation state of the in-plant unit here includes an AGC putting state of the in-plant unit, power of the service bus, current, and the like.
In practical application, the energy management system 2 collects the state of the high-voltage energy storage system 1, the instruction sent by the control unit 3 (the power plant motion device 18 sends the instruction to the control unit 3 of the in-plant unit) and the running state of the in-plant unit in real time, and controls the high-voltage energy storage system 1 to perform corresponding actions according to the information.
Specifically, the operation state of the high-voltage energy storage system 1 herein includes the voltage of the high-voltage energy storage system 1, the temperature of the high-voltage energy storage system 1, the electric quantity of the high-voltage energy storage system 1, whether a fault occurs, and the like;
in an embodiment of the present invention, in order to protect the high-voltage energy storage system 1, avoid the overcharge or overdischarge of the high-voltage energy storage system 1, the energy management system 2 can be utilized to limit the output power of the high-voltage energy storage system 1 according to the running state of the high-voltage energy storage system 1, for example, the preset range of the battery capacity can be set to 25% -85% of the total capacity of the high-voltage energy storage system 1, the present application does not make special limitation on the specific value of the preset range of the capacity of the high-voltage energy storage system 1, and is determined according to the actual situation, specifically, when the battery capacity is in the range of 25% -85% of the total capacity, the maximum output power of the high-voltage energy storage system 1 is; when the battery capacity is less than 25% of the total capacity, the maximum discharge output power of the high-voltage energy storage system 1 is 0, and the maximum charge output power limit of the high-voltage energy storage system 1 is rated power; when the battery capacity is greater than 85% of the total capacity, the maximum charging output power of the high-voltage energy storage system 1 is 0, and the maximum discharging output power of the high-voltage energy storage system 1 is rated power;
in practical application, when a load needs to be increased, a remote dispatching unit sends an AGC instruction for increasing the load to a power plant movement device 18, then the power plant movement device 18 forwards the AGC instruction for increasing the load (namely, a difference value obtained by subtracting actual power of an in-plant unit from the AGC instruction is positive) to a control unit 3 of the in-plant unit, then an energy management system 2 firstly judges whether a high-voltage energy storage system 1 is in fault, if the high-voltage energy storage system 1 is in fault, the energy management system 2 sends an instruction for not working, meanwhile, information interaction is carried out with the control unit 3 of the in-plant unit, the control unit 3 controls the in-plant unit to increase output power so as to realize quick response of the output of the in-plant unit to the AGC instruction, if the high-voltage energy storage system 1 is normal, whether the capacity of the high-voltage energy storage system 1 is in a preset range is continuously judged, if the capacity of the high-voltage energy, therefore, the load of the units in the plant is increased to meet the AGC instruction, otherwise, the high-voltage energy storage system 1 does not act but interacts with the units in the thermal power plant, the control unit 3 of the units in the thermal power plant controls the output of the units in the thermal power plant so as to change along with the AGC instruction, at the moment, the output power of the high-voltage energy storage system 1 is the discharge power, the power is the smaller value between the rated discharge power and the difference value, the total power obtained by superposing the output power of the high-voltage energy storage system 1 and the actual output power of the units in the plant is used as feedback power, and finally the feedback power is sent to a remote dispatching unit through a power plant movement device 18;
when the load needs to be reduced, a remote dispatching unit sends an AGC instruction for reducing the load to a power plant movement device 18, then the power plant movement device 18 forwards the AGC instruction for reducing the load (namely when the difference value of subtracting the actual power of the in-plant unit from the AGC instruction is negative) to a control unit 3 of the in-plant unit, then an energy management system 2 firstly judges whether a high-voltage energy storage system 1 is in fault, if the high-voltage energy storage system 1 is in fault, the energy management system 2 sends an instruction for not acting, meanwhile, information interaction is carried out with the control unit 3 of the in-plant unit, the control unit 3 controls the in-plant unit to reduce the output power so as to realize the quick response of the output of the in-plant unit to the AGC instruction, if the high-voltage energy storage system 1 is normal, whether the capacity of the high-voltage energy storage system 1 is in a preset range is continuously judged, if the, therefore, the fact that the load of the internal unit of the thermal power plant follows the AGC instruction is achieved, otherwise, the high-voltage energy storage system 1 does not act, the control unit 3 of the internal unit of the thermal power plant controls the internal unit of the thermal power plant to correspondingly act so as to ensure that the load of the internal unit of the thermal power plant changes along with the AGC instruction, at the moment, the output power of the high-voltage energy storage system 1 is charging power, the power is a larger value between rated charging power and a difference value, the total power obtained after the output power of the high-voltage energy storage system 1 and the actual output power of the internal unit of the thermal power plant are overlapped serves as feedback power, and finally the feedback power is sent to;
in one embodiment of the present invention, the plant unit control unit 3 is a distributed control system,
in addition, the control unit 3 of the present invention may be other types of control units, and the present invention is not limited thereto.
The working process of the utility model is explained as follows:
firstly, a high-voltage energy storage system 1 is directly connected with a service bus of a unit in a plant, an energy management system 2 is connected with a control unit 3 of the unit in the thermal power plant, when the high-voltage energy storage system 1 runs normally,
when the load needs to be increased, a remote dispatching device sends an AGC instruction for increasing the load to a power plant movement device 18, then the power plant movement device 18 forwards the AGC instruction for increasing the load (namely the difference value of subtracting the actual power of an in-plant unit from the AGC instruction is positive) to a control unit 3 of the in-plant unit, then an energy management system 2 controls a high-voltage energy storage system 1 to discharge to assist the in-plant unit, so that the load of the in-plant unit is increased to be in accordance with the AGC instruction, at the moment, the output power of the high-voltage energy storage system 1 is the discharge power, the power is the smaller value between the rated discharge power and the difference value, the total power obtained by superposing the output power of the high-voltage energy storage system 1 and the actual output power of the in-plant unit is used as feedback power, and finally the feedback power is sent to the remote dispatching device;
when the load needs to be reduced, a remote dispatching device sends an AGC instruction for reducing the load to a power plant movement device 18, then the power plant movement device 18 forwards the AGC instruction for reducing the load (namely when the difference value of the AGC instruction minus the actual power of the unit in the plant is negative) to a control unit 3 of the unit in the plant, then an energy management system 2 directly controls a high-voltage energy storage system 1 to be charged as the load, so that the load of the unit in the thermal power plant follows the AGC instruction, otherwise, the high-voltage energy storage system 1 does not act, the control unit 3 of the unit in the thermal power plant controls the unit in the plant to act correspondingly to ensure that the load of the unit in the thermal power plant changes along with the AGC instruction, at the moment, the output power of the high-voltage energy storage system 1 is charging power, the power is a larger value between the rated charging power and the difference value, and the total power of the output power of the high-voltage energy storage system 1, and finally, sending the feedback power to a remote dispatching through the power plant moving device 18.
In another embodiment of the present invention, as shown in fig. 7, when the service transformer is a double-split three-winding transformer, the winding type is determined by the practical use of the power plant, which is not limited herein, an auxiliary frequency modulation device includes: the system comprises two groups of high-voltage energy storage systems 1 and an energy management system 2, wherein the two groups of high-voltage energy storage systems 1 are respectively connected with a bus of station service power of a unit in a plant, so that the unit in the thermal power plant can perform efficient and safe combined operation to respond to an AGC (automatic gain control) instruction sent by remote scheduling under the condition of not using a transformer, the connection mode can effectively shorten the response time, improve the regulation speed and the regulation precision while ensuring the reduction of cost, further stabilize the load, reduce the abrasion of the unit in the plant and improve the working efficiency, the energy management system 2 is respectively connected with the high-voltage energy storage systems 1 and a control unit 3 of the unit in the thermal power plant, and the output power of the high-voltage energy storage systems 1 is controlled according to the AGC instruction sent by the high-voltage energy storage systems 1 and the control unit 3 in the plant, the actual output power and the operation, when the AGC instruction is a load ascending/descending instruction, the high-voltage energy storage system 1 correspondingly performs discharging/charging so as to realize that the high-voltage energy storage system 1 is combined with the in-plant unit to quickly respond to the AGC instruction.
In practical application, the two groups of high-voltage energy storage systems 1 can be completely the same in structure and system parameters, namely the rated power and the rated capacity are completely the same, and the energy management system 2 equally divides the output power instruction into the two groups of high-voltage energy storage systems 1, so as to control the output of the two groups of high-voltage energy storage systems 1; the two groups of high-voltage energy storage systems 1 can not be completely the same in structure and system parameters, namely the rated power and the rated capacity are different, and the energy management system 2 calculates the output power shared by the output power instruction according to the two groups of system parameters, then distributes the output power instruction to the two groups of energy storage systems, and controls the output of the two groups of energy storage systems.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It should be noted that unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and may include, for example, fixed or removable connections or integral connections; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above description is only for the preferred embodiment of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (7)
1. An auxiliary frequency modulation device, comprising: the system comprises a high-voltage energy storage system and an energy management system, wherein a bus access end of the high-voltage energy storage system is connected with an auxiliary power bus of a unit in a plant, an output end of the energy management system is connected with a control end of the high-voltage energy storage system, and an input end of the energy management system is connected with an output end of a unit control unit in the thermal power plant;
the high-voltage energy storage system comprises: the three grid-connected reactor branches are connected to one end, close to the three-phase power grid, of the three power conversion branches and used for current limiting and filtering;
the power conversion branch includes: a plurality of power conversion modules connected in series with each other;
the power conversion module includes: the power conversion unit and the energy storage unit, a plurality of groups of power conversion units are connected in series through alternating current ports, and the direct current ports of the plurality of groups of power conversion units are independent from each other and are respectively connected with one energy storage unit.
2. An auxiliary frequency modulation device according to claim 1,
the output end of the energy management system is connected with the input end of the power conversion unit controller, and the three output ends of the power conversion unit controller are respectively connected with the three power conversion branches;
and the energy management system sends power control instructions to the three power conversion branches through the power conversion unit controller so as to control the output power of each power conversion branch.
3. An auxiliary frequency modulation device according to claim 1, wherein the power conversion unit comprises a power conversion circuit and a filter circuit, and the power conversion circuit and the filter circuit are connected in series.
4. An auxiliary frequency modulation device according to claim 3, wherein the power conversion circuit is configured as a single phase H-bridge circuit.
5. The auxiliary frequency modulation device according to claim 4, wherein the filter circuit comprises a DC flat filter capacitor and a DC filter reactor;
the direct-current flat filter capacitor is connected with the single-phase H-bridge circuit in parallel and used for smoothing voltage fluctuation on a direct-current bus;
the direct-current filter reactor is connected in series to the direct-current port side of the single-phase H-bridge circuit and used for reducing double-frequency pulsation together with the direct-current flat filter capacitor and smoothing output current of the energy storage unit.
6. The auxiliary frequency modulation device according to claim 4, wherein the power conversion unit controller comprises a decoding module, a signal processing module and a driving circuit;
the input end of the decoding module is connected with the output end of the controller of the energy management system, and the decoding module receives a control command sent by the controller of the energy management system;
the output end of the decoding module is connected with the input end of the signal processing module, and the decoding module decodes the control command and sends the decoded control command to the signal processing module;
the output end of the signal processing module is connected with the input end of the driving circuit, and the signal processing module sends the decoded control command to the driving circuit;
the output end of the driving circuit is connected with the input end of the power conversion circuit, and the control command controls the power conversion unit through a driving signal generated by the driving circuit.
7. An energy storage frequency modulation system, comprising: the auxiliary frequency modulation device, the thermal power plant unit and the power plant motion device as claimed in any one of claims 1 to 6, wherein the power plant motion device is connected to the auxiliary frequency modulation device through a control unit of the power plant unit, and is configured to receive the AGC command transmitted by the remote scheduling and transmit the AGC command to the control unit of the power plant unit, and simultaneously feed back the combined output of the power plant unit and the high-voltage energy storage system to the remote scheduling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920848898.6U CN210724217U (en) | 2019-06-04 | 2019-06-04 | Auxiliary frequency modulation device and energy storage frequency modulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920848898.6U CN210724217U (en) | 2019-06-04 | 2019-06-04 | Auxiliary frequency modulation device and energy storage frequency modulation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210724217U true CN210724217U (en) | 2020-06-09 |
Family
ID=70935170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920848898.6U Active CN210724217U (en) | 2019-06-04 | 2019-06-04 | Auxiliary frequency modulation device and energy storage frequency modulation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210724217U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114825596A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Stand-by power supply system for thermal power electronic direct-hanging energy storage plant |
| CN115133576A (en) * | 2022-07-26 | 2022-09-30 | 西安热工研究院有限公司 | Hydropower station energy storage system with recyclable energy and working medium |
| CN115173439A (en) * | 2022-09-08 | 2022-10-11 | 西安热工研究院有限公司 | Controllable energy storage and thermal power combined frequency modulation system and method |
| CN115173438A (en) * | 2022-09-08 | 2022-10-11 | 西安热工研究院有限公司 | Frequency modulation system and method for flywheel energy storage auxiliary thermal power for controllable high-voltage plant |
-
2019
- 2019-06-04 CN CN201920848898.6U patent/CN210724217U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114825596A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Stand-by power supply system for thermal power electronic direct-hanging energy storage plant |
| CN114825596B (en) * | 2022-06-29 | 2022-09-27 | 西安热工研究院有限公司 | Backup power supply system for thermal power electronic direct-hanging energy storage plant |
| CN115133576A (en) * | 2022-07-26 | 2022-09-30 | 西安热工研究院有限公司 | Hydropower station energy storage system with recyclable energy and working medium |
| CN115173439A (en) * | 2022-09-08 | 2022-10-11 | 西安热工研究院有限公司 | Controllable energy storage and thermal power combined frequency modulation system and method |
| CN115173438A (en) * | 2022-09-08 | 2022-10-11 | 西安热工研究院有限公司 | Frequency modulation system and method for flywheel energy storage auxiliary thermal power for controllable high-voltage plant |
| CN115173438B (en) * | 2022-09-08 | 2023-01-13 | 西安热工研究院有限公司 | Frequency modulation system and method for flywheel energy storage auxiliary thermal power for controllable high-voltage plant |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210724217U (en) | Auxiliary frequency modulation device and energy storage frequency modulation system | |
| CN102916440B (en) | Battery energy storage system based power conversion system and control method thereof | |
| CN113939968B (en) | Energy Storage System | |
| CN103427430B (en) | A kind of energy management method of mixed energy storage system in microgrid | |
| CN115313457B (en) | battery energy storage system | |
| CN109950969B (en) | A photovoltaic backup-based emergency power supply for DC systems in substations | |
| CN109873568B (en) | Multi-DC port converter and control method | |
| CN107785919B (en) | Hybrid energy storage system and control method thereof | |
| CN112510803B (en) | Single-channel module of airplane distributed power grid structure, power generation system and control method | |
| CN117713323B (en) | Battery SOC balance control method, system and module cascading battery energy storage system | |
| CN202260483U (en) | Energy recovery electric automobile power battery test control system | |
| CN114914903B (en) | Energy storage system structure and control method for AC power grid interconnection | |
| CN110535166A (en) | A hybrid series multi-drop direct current transmission system | |
| CN115955117B (en) | Direct-current power supply conversion device for bridging new energy power generation, energy storage and micro-grid | |
| CN218335341U (en) | Electric energy storage system and subsystem thereof | |
| CN216819454U (en) | Energy storage power module and energy storage system | |
| CN116667414A (en) | A control system and method for co-capacity all-vanadium liquid flow energy storage with parallel charging and discharging | |
| CN116142011B (en) | Energy storage charging system and current distribution control method | |
| CN114221370A (en) | Energy storage type offshore wind power plant flexible-direct power transmission system and fault ride-through method thereof | |
| CN120422682A (en) | Multifunctional charging pile system based on solid-state transformer | |
| CN217486182U (en) | Energy storage system structure for alternating current power grid interconnection | |
| CN217904294U (en) | Photovoltaic energy storage system | |
| CN114447381B (en) | Group string type flow battery energy storage system | |
| CN110690723A (en) | Control Method of Energy Storage Modular Multilevel Converter in Offshore Wind Power System | |
| CN205724935U (en) | A kind of grid-connected photovoltaic system with intelligent power dividing function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Ke Nan Inventor after: Wu Zhipeng Inventor after: Tang Shuangxi Inventor after: Payment Construction Inventor before: Ke Nan Inventor before: Wu Zhipeng Inventor before: Tang Shuangxi Inventor before: Payment Construction |
|
| CB03 | Change of inventor or designer information |