CN114825410A - Medium-voltage direct-current energy storage system for thermal power plant - Google Patents
Medium-voltage direct-current energy storage system for thermal power plant Download PDFInfo
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- CN114825410A CN114825410A CN202210748172.1A CN202210748172A CN114825410A CN 114825410 A CN114825410 A CN 114825410A CN 202210748172 A CN202210748172 A CN 202210748172A CN 114825410 A CN114825410 A CN 114825410A
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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
- H02J15/00—Systems for storing electric energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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Abstract
The application provides a medium voltage direct current energy storage system for thermal power plant, the system includes: the system comprises a factory alternating current unit and a direct current medium voltage energy storage unit, wherein the factory alternating current unit is connected with the direct current medium voltage energy storage unit; the station ac unit comprises a bidirectional PCS converter, and is used for exchanging power with the dc medium voltage energy storage unit through the bidirectional PCS converter; the direct-current medium-voltage energy storage unit comprises an electrochemical energy storage battery, and the direct-current medium-voltage energy storage unit comprises the electrochemical energy storage battery, a factory variable-frequency inversion driver, a water feeding pump, a variable-frequency large-scale fan grid-connected switch, a water feeding pump and a variable-frequency large-scale fan. According to the technical scheme, the electrochemical energy storage battery is used for participating in unit response AGC frequency modulation, the thermal power plant medium-voltage direct-current energy storage system is further provided with a plant variable-frequency water feed pump and a variable-frequency large-scale fan, a rectification driving link in a frequency conversion device is not needed, frequency conversion equipment is simplified, and the power supply reliability of the thermal power plant medium-voltage direct-current energy storage system is improved.
Description
Technical Field
The application relates to the technical field of medium-voltage direct-current energy storage, in particular to a medium-voltage direct-current energy storage system for a thermal power plant.
Background
The typical design of the factory power system of a large-scale thermal power generating unit at present is that a high-voltage bus system for a factory is arranged by tapping a generator outlet, factory power above 200kW is led from a factory high-voltage bus, a water feeding pump with the largest power load is generally provided with a steam-driven pump for rotating speed adjustment in order to reduce the factory power consumption, the large-scale fan considers investment and generally selects a movable blade adjustable mode for load adjustment in an energy-saving and economical mode, and the load adjustment of low-voltage power generally selects variable frequency adjustment. The energy storage system has the advantages of high response speed, strong short-time power throughput capacity and flexible adjustment, can realize full power output within milliseconds to seconds, and can be accurately controlled within rated power. Relevant researches show that the frequency modulation efficiency of an energy storage system with the continuous charging/discharging time of 15min is 1.4 times that of a hydroelectric generating set, 2.2 times that of a gas generating set and 24 times that of a coal generating set. However, the thermal power plant system combining the existing energy storage system and the conventional thermal power supply is not flexible in power exchange and low in frequency modulation capability, so that the energy consumption is large and the power supply stability is poor.
Disclosure of Invention
The application provides a medium voltage direct current energy storage system for thermal power plant to solve the great and poor technical problem of power supply stability of energy consumption in the correlation technique at least.
An embodiment of a first aspect of the present application provides a medium-voltage direct-current energy storage system for a thermal power plant, the system includes: the system comprises a factory alternating current unit and a direct current medium voltage energy storage unit, wherein the factory alternating current unit is connected with the direct current medium voltage energy storage unit;
the service alternating current unit comprises a bidirectional energy storage System (PCS) converter, and is used for exchanging Power with the direct current medium-voltage energy storage unit through the bidirectional PCS converter;
the direct-current medium-voltage energy storage unit comprises an electrochemical energy storage battery and is used for charging and discharging according to an AGC frequency adjusting instruction of a power grid;
wherein, direct current middling pressure energy storage unit still includes: the system comprises a factory variable frequency inversion driver, a water supply pump, a variable frequency large fan grid-connected switch, a water supply pump and a variable frequency large fan;
the water feeding pump and the frequency conversion large-scale fan are connected with the station variable frequency inversion driver through the water feeding pump and the frequency conversion large-scale fan grid-connected switch.
Preferably, the service communication unit further comprises: the system comprises a split winding transformer, a first bus for alternating current plant, a second bus for alternating current plant, a direct current interconnection switch for plant alternating current-plant and a double-winding transformer;
the high-voltage side of the split winding transformer is connected with a generator, and the low-voltage side of the split winding transformer is respectively connected with the first bus for the alternating current plant and the second bus for the alternating current plant;
the double-winding transformer is connected with the alternating current station-use first bus through the station-use alternating current-station-use direct current interconnection switch;
the double-winding transformer is connected with the bidirectional PCS converter.
Preferably, the service communication unit further includes: an alternating current load switch and a factory alternating current load;
and the station AC load is connected with the AC station first bus through the AC load switch.
Further, the dc medium voltage energy storage unit further includes: the system comprises a medium-voltage direct-current bus, an energy storage battery grid-connected direct-current breaker and an energy storage DC-DC converter;
one end of the energy storage DC-DC converter is connected with the medium-voltage direct-current bus through the energy storage battery grid-connected direct-current breaker;
and the other end of the energy storage DC-DC converter is connected with the electrochemical energy storage battery.
Further, the dc medium voltage energy storage unit further includes: a DC load circuit breaker and a DC load;
the direct current load is connected with the medium-voltage direct current bus through the direct current load breaker.
Further, the dc medium voltage energy storage unit further includes: the system comprises a factory variable frequency inversion driver, a water supply pump, a variable frequency large fan grid-connected switch, a water supply pump and a variable frequency large fan;
the water feeding pump and the frequency conversion large-scale fan are connected with the station variable frequency inversion driver through the water feeding pump and the frequency conversion large-scale fan grid-connected switch.
Further, when the electrochemical energy storage battery is charged, the energy storage DC-DC converter works in a boost state;
when the electrochemical energy storage battery is discharged, the energy storage DC-DC converter works in a buck state.
Further, the bidirectional PCS converter is used for power bidirectional transmission and responds to a frequency reduction-load increase instruction and a frequency increase-load decrease instruction.
Further, the station ac unit is further configured to charge the electrochemical energy storage battery through the bidirectional PCS converter and the energy storage DC-DC converter when the thermal power generating unit receives a power grid frequency up-down command, where the bidirectional PCS converter operates in a rectification state.
Further, the plant alternating current unit is further configured to transmit electric energy to the plant alternating current unit through the bidirectional PCS converter and the energy storage DC-DC converter when the thermal power generating unit receives a power grid frequency reduction-load increase instruction, wherein the bidirectional PCS converter operates in an inversion state.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
the application provides a medium voltage direct current energy storage system for thermal power plant includes: the system comprises a factory alternating current unit and a direct current medium voltage energy storage unit, wherein the factory alternating current unit is connected with the direct current medium voltage energy storage unit; the station ac unit comprises a bidirectional PCS converter, and is used for exchanging power with the dc medium voltage energy storage unit through the bidirectional PCS converter; the direct-current medium-voltage energy storage unit comprises an electrochemical energy storage battery, and the direct-current medium-voltage energy storage unit is used for charging and discharging according to an Automatic Generation Control (AGC) frequency adjusting instruction of a power grid; wherein, direct current middling pressure energy storage unit still includes: the system comprises a factory variable frequency inversion driver, a water supply pump, a variable frequency large fan grid-connected switch, a water supply pump and a variable frequency large fan; the water feeding pump and the frequency conversion large-scale fan are connected with the factory variable frequency inversion driver through the water feeding pump and the frequency conversion large-scale fan grid-connected switch. The direct-current medium-voltage energy storage unit is used for participating in unit response AGC frequency modulation, meanwhile, the medium-voltage direct-current energy storage system for the thermal power plant is further provided with a plant variable-frequency water feeding pump and a variable-frequency large-scale fan, a rectification driving link in a frequency conversion device is not needed, frequency conversion equipment is simplified, the frequency modulation capacity and the power exchange flexibility of the medium-voltage direct-current energy storage system for the thermal power plant are improved, further, energy consumption is reduced, and meanwhile, the power supply stability of the medium-voltage direct-current energy storage system for the thermal power plant is improved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application 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 block diagram of a medium-voltage dc energy storage system for a thermal power plant according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a dc medium voltage energy storage unit according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of an industrial communication unit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a medium-voltage direct-current energy storage system for a thermal power plant according to an embodiment of the present application;
description of reference numerals:
a plant AC unit 1, a DC medium voltage energy storage unit 2, a bidirectional PCS converter 1-1, a split winding transformer 1-2, a first bus 1-3 for AC plant, a second bus 1-4 for AC plant, a direct current interconnection switch 1-5 for plant AC-plant, a double winding transformer 1-6, an alternating current load switch 1-7, the system comprises a factory alternating current load 1-8, an electrochemical energy storage battery 2-1, a medium-voltage direct current bus 2-2, an energy storage battery grid-connected direct current breaker 2-3, an energy storage DC-DC converter 2-4, a direct current load breaker 2-5, a direct current load 2-6, a factory variable frequency inversion driver 2-7, a water feeding pump and variable frequency large fan grid-connected switch 2-8 and a water feeding pump and variable frequency large fan 2-9.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The application provides a medium voltage direct current energy storage system for thermal power plant, wherein, the system includes: the system comprises a factory alternating current unit and a direct current medium voltage energy storage unit, wherein the factory alternating current unit is connected with the direct current medium voltage energy storage unit; the station ac unit comprises a bidirectional PCS converter, and is used for exchanging power with the dc medium voltage energy storage unit through the bidirectional PCS converter; the direct-current medium-voltage energy storage unit comprises an electrochemical energy storage battery and is used for charging and discharging according to an AGC frequency adjusting instruction of a power grid; wherein, direct current middling pressure energy storage unit still includes: the system comprises a factory variable frequency inversion driver, a water supply pump, a variable frequency large fan grid-connected switch, a water supply pump and a variable frequency large fan; the water feeding pump and the frequency conversion large-scale fan are connected with the station variable frequency inversion driver through the water feeding pump and the frequency conversion large-scale fan grid-connected switch. The technical scheme who this application provided utilizes electrochemistry energy storage battery to participate in unit response AGC frequency modulation, just the medium voltage direct current energy storage system for the thermal power plant still has the station-oriented frequency conversion water-feeding pump and the large-scale fan of frequency conversion, need not the rectification drive link among the frequency conversion equipment, has simplified frequency conversion equipment, has improved the frequency modulation ability and the flexibility of power exchange of medium voltage direct current energy storage system for the thermal power plant, and then has reduced the energy consumption, has improved the power supply stability of medium voltage direct current energy storage system for the thermal power plant simultaneously.
A medium-voltage direct-current energy storage system for a thermal power plant according to an embodiment of the present application is described below with reference to the accompanying drawings.
Example one
Fig. 1 is a block diagram of a medium-voltage direct-current energy storage system for a thermal power plant according to an embodiment of the present application, and as shown in fig. 1, the system includes: the system comprises a factory alternating current unit 1 and a direct current medium voltage energy storage unit 2, wherein the factory alternating current unit 1 is connected with the direct current medium voltage energy storage unit 2;
the station ac unit 1 includes a bidirectional PCS converter 1-1, and the station ac unit 1 is configured to perform power exchange with the dc medium-voltage energy storage unit 2 through the bidirectional PCS converter 1-1, as shown in fig. 4;
the direct current medium voltage energy storage unit 2 comprises an electrochemical energy storage battery 2-1, and the direct current medium voltage energy storage unit 2 is used for charging and discharging according to an AGC frequency adjustment instruction of a power grid, as shown in fig. 4.
Wherein, the dc medium voltage energy storage unit 2 further comprises: the system comprises a factory variable frequency inversion driver 2-7, a water supply pump and variable frequency large fan grid-connected switch 2-8, a water supply pump and variable frequency large fan 2-9;
the water feeding pump and the frequency conversion large-scale fan 2-9 are connected with the station variable frequency inversion driver 2-7 through the water feeding pump and the frequency conversion large-scale fan grid-connected switch 2-8.
In the embodiment of the present disclosure, as shown in fig. 2, the direct current medium voltage energy storage unit 2 includes, in addition to an electrochemical energy storage battery 2-1, a plant frequency conversion inverter driver 2-7, a water supply pump and a frequency conversion large-scale fan grid-connected switch 2-8, and a water supply pump and a frequency conversion large-scale fan 2-9: the system comprises a medium-voltage direct-current bus 2-2, an energy storage battery grid-connected direct-current breaker 2-3 and an energy storage DC-DC converter 2-4;
one end of the energy storage DC-DC converter 2-4 is connected with the medium-voltage direct-current bus 2-2 through the energy storage battery grid-connected direct-current breaker 2-3;
the other end of the energy storage DC-DC converter is connected with the electrochemical energy storage battery 2-1;
it should be noted that the dc medium voltage energy storage unit 2 further includes: a direct current load breaker 2-5 and a direct current load 2-6;
the direct current load 2-6 is connected with the medium voltage direct current bus 2-2 through the direct current load breaker 2-5;
the voltage corresponding to the medium-voltage direct-current bus 2-2 can be 6 KV;
in the embodiment of the present disclosure, as shown in fig. 3, the service ac unit 1 includes, in addition to the bidirectional PCS converter 1-1: the system comprises a split winding transformer 1-2, a first bus 1-3 for an alternating current plant, a second bus 1-4 for the alternating current plant, a direct current interconnection switch 1-5 for the plant alternating current plant and a double winding transformer 1-6;
it should be noted that the voltage corresponding to the first bus 1-3 for the ac power plant and the second bus 1-4 for the ac power plant may be 6.3 KV;
the high-voltage side of the split winding transformer 1-2 is connected with a generator, and the low-voltage side of the split winding transformer 1-2 is respectively connected with the first bus 1-3 and the second bus 1-4 for the alternating current plant;
wherein, the voltage corresponding to the generator may be 20KV, as shown in fig. 4;
the double-winding transformer 1-6 is connected with the first AC factory bus 1-3 through the AC factory-DC factory interconnection switch 1-5;
the double-winding transformer 1-6 is connected with the bidirectional PCS converter 1-1;
it should be noted that, as shown in fig. 3, the service communication unit 1 may further include: alternating current load switches 1-7 and house-service alternating current loads 1-8;
and the plant alternating current loads 1-8 are connected with the alternating current plant first bus 1-3 through the alternating current load switches 1-7.
For example, taking the first bus 1-3 for ac plant as an example, the ac load 1-8 for plant is connected to the first bus 1-3 for ac plant through the ac load switch 1-7, the high-voltage side of the dual-winding transformer 1-6 is connected to the first bus 1-3 for ac plant through the ac-dc tie switch 1-5 for plant, and the low-voltage side of the dual-winding transformer 1-6 is connected to the dc medium-voltage energy storage unit 2 through the bidirectional PCS converter 1-1. Compared with the case that a circuit breaker is added to the direct-current side of the bidirectional PCS converter 1-1, the factory alternating-current-factory direct-current interconnection switch 1-5 reduces investment, and the power exchange between the factory alternating-current unit 1 and the direct-current medium-voltage energy storage unit 2 is more flexible.
It should be noted that one end of the bidirectional PCS converter 1-1 is connected to the double-winding transformer 1-6, and the other end is connected to the medium-voltage dc bus 2-2, as shown in fig. 4.
In the disclosed embodiment, when the electrochemical energy storage cell 2-1 is charged, the energy storage DC-DC converter 2-4 is operated in a boost state;
when the electrochemical energy storage battery 2-1 is discharged, the energy storage DC-DC converter 2-4 works in a buck state.
Illustratively, the electrochemical energy storage battery 2-1 is connected with the medium-voltage direct-current bus 2-2 through the energy storage DC-DC converter 2-4 and the energy storage battery grid-connected direct-current breaker 2-3, the energy storage DC-DC converter 2-4 has a voltage boosting/reducing function and can realize 220V-6kV direct-current voltage variation, when the electrochemical energy storage battery 2-1 is charged, the energy storage DC-DC converter 2-4 works in a boost state, when the electrochemical energy storage battery 2-1 is discharged, the energy storage DC-DC converter 2-4 works in a buck state, the water supply pump and the frequency conversion large-scale fan 2-9 are connected with the medium-voltage direct-current bus 2-2 through the water supply pump and the frequency conversion large-scale fan grid-connected switch 2-8 and the frequency conversion inverter driver 2-7 for the plant, compared with the traditional frequency converter, the plant variable-frequency inverter drivers 2-7 save a rectification driving link, simplify variable-frequency equipment, improve the power supply reliability of a medium-voltage direct-current energy storage system for the thermal power plant, realize the full frequency conversion of important high-voltage power and obviously reduce the energy consumption level of the whole plant.
Specifically, the bidirectional PCS converter 1-1 is used for power bidirectional transmission and responds to frequency reduction-load increase and frequency increase-load reduction commands.
The plant ac unit 1 is further configured to charge the electrochemical energy storage battery 2-1 through the bidirectional PCS converter 1-1 and the energy storage DC-DC converter 2-4 when the thermal power generating unit receives a power grid frequency up-down load command, where the bidirectional PCS converter 1-1 operates in a rectifying state;
further, the plant ac unit 1 is further configured to transmit electric energy to the plant ac unit 1 through the bidirectional PCS converter 1-1 and the energy storage DC-DC converter 2-4 when the thermal power generating unit receives a power grid frequency down-up instruction, where the bidirectional PCS converter 1-1 operates in an inversion state.
In summary, in the medium-voltage direct-current energy storage system for the thermal power plant, the switches are arranged on the alternating-current sides of the bidirectional PCS converter 1-1 and the variable-frequency inverter driver 1-2, so that a direct-current circuit breaker can be prevented from being arranged on the direct-current side, the equipment investment is reduced, and the power supply reliability is improved.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (9)
1. The utility model provides a medium-voltage direct current energy storage system for thermal power plant which characterized in that includes: the system comprises a factory alternating current unit and a direct current medium voltage energy storage unit, wherein the factory alternating current unit is connected with the direct current medium voltage energy storage unit;
the station ac unit comprises a bidirectional PCS converter, and is used for exchanging power with the dc medium voltage energy storage unit through the bidirectional PCS converter;
the direct-current medium-voltage energy storage unit comprises an electrochemical energy storage battery and is used for charging and discharging according to an AGC frequency adjusting instruction of a power grid;
wherein, direct current middling pressure energy storage unit still includes: the system comprises a factory variable frequency inversion driver, a water supply pump, a variable frequency large fan grid-connected switch, a water supply pump and a variable frequency large fan;
the water feeding pump and the frequency conversion large-scale fan are connected with the station variable frequency inversion driver through the water feeding pump and the frequency conversion large-scale fan grid-connected switch.
2. The medium voltage dc energy storage system for thermal power plants according to claim 1, wherein said plant ac unit further comprises: the system comprises a split winding transformer, a first bus for alternating current plant, a second bus for alternating current plant, a direct current interconnection switch for plant alternating current-plant and a double-winding transformer;
the high-voltage side of the split winding transformer is connected with a generator, and the low-voltage side of the split winding transformer is respectively connected with the first bus for the alternating current plant and the second bus for the alternating current plant;
the double-winding transformer is connected with the alternating current station-use first bus through the station-use alternating current-station-use direct current interconnection switch;
the double-winding transformer is connected with the bidirectional PCS converter.
3. The medium voltage dc energy storage system for thermal power plants of claim 2, wherein said plant ac unit further comprises: an alternating current load switch and a factory alternating current load;
and the station AC load is connected with the AC station first bus through the AC load switch.
4. The medium voltage direct current energy storage system for thermal power plants of claim 2, wherein said direct current medium voltage energy storage unit further comprises: the system comprises a medium-voltage direct-current bus, an energy storage battery grid-connected direct-current breaker and an energy storage DC-DC converter;
one end of the energy storage DC-DC converter is connected with the medium-voltage direct-current bus through the energy storage battery grid-connected direct-current breaker;
and the other end of the energy storage DC-DC converter is connected with the electrochemical energy storage battery.
5. The medium voltage direct current energy storage system for thermal power plants of claim 4, wherein said direct current medium voltage energy storage unit further comprises: a DC load circuit breaker and a DC load;
the direct current load is connected with the medium-voltage direct current bus through the direct current load breaker.
6. The medium voltage direct current energy storage system for thermal power plants according to claim 4, wherein said energy storage DC-DC converter operates in a boost state when said electrochemical energy storage cell is charged;
when the electrochemical energy storage battery is discharged, the energy storage DC-DC converter works in a buck state.
7. The medium voltage dc energy storage system for thermal power plants according to claim 2 wherein said bidirectional PCS converter is adapted for bidirectional transmission of power in response to frequency down-up commands and frequency up-down commands.
8. The medium voltage DC energy storage system of claim 4, wherein said plant ac unit is further configured to charge said electrochemical energy storage cell through said bidirectional PCS converter and said energy storage DC-DC converter when a grid frequency up-down load command is received by the thermal power plant, wherein said bidirectional PCS converter operates in a rectified state.
9. The medium voltage DC energy storage system according to claim 4, wherein the plant ac unit is further configured to transmit electric energy to the plant ac unit through the bidirectional PCS converter and the energy storage DC-DC converter when the thermal power generating unit receives a grid frequency down-up command, wherein the bidirectional PCS converter operates in an inversion state.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115149589A (en) * | 2022-09-05 | 2022-10-04 | 西安热工研究院有限公司 | System and method for high-voltage plant alternating current controllable load auxiliary thermal power frequency modulation |
| CN117154789A (en) * | 2023-08-22 | 2023-12-01 | 华能罗源发电有限责任公司 | Medium-voltage direct-current energy storage system for thermal power plant |
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