CN109193913B - Energy storage battery service power standby system based on AGC frequency modulation of thermal power plant - Google Patents
Energy storage battery service power standby system based on AGC frequency modulation of thermal power plant Download PDFInfo
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- CN109193913B CN109193913B CN201811296341.2A CN201811296341A CN109193913B CN 109193913 B CN109193913 B CN 109193913B CN 201811296341 A CN201811296341 A CN 201811296341A CN 109193913 B CN109193913 B CN 109193913B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 93
- 238000006477 desulfuration reaction Methods 0.000 claims description 13
- 230000023556 desulfurization Effects 0.000 claims description 13
- 238000012806 monitoring device Methods 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000002457 bidirectional effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000009849 deactivation Effects 0.000 abstract 1
- 241000196324 Embryophyta Species 0.000 description 18
- 238000010586 diagram Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
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- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention discloses a system for standby energy storage battery service power based on AGC frequency modulation of a thermal power plant, which comprises an energy storage system, a main plant direct current system, a unit alternating current security power system and a unit direct current security power system; the invention utilizes the storage battery pack participating in the combined AGC frequency modulation of the thermal power unit and the energy storage system in the thermal power plant, and effectively and timely provides sufficient reserve for the direct current system of the main plant, the alternating current security power system of the unit and the direct current security system of the unit according to the running conditions of the direct current system of the main plant, the alternating current security power system of the unit and the direct current security system of the unit, thereby avoiding the deactivation of important equipment caused by the faults of the direct current system of the plant and the security system of the unit; the invention relates to a technology for standby power supply of an energy storage battery based on thermal power plant frequency modulation, which can greatly improve the safety and reliability of the power supply of the power plant and further improve the quality of electric energy.
Description
Technical Field
The invention relates to a power supply system for power plant, in particular to a power supply system for power plant of an energy storage battery based on AGC frequency modulation of a thermal power plant.
Background
Automatic devices, accident lighting, relay protection devices, signal devices and remote operation of electrical equipment in power plants are generally powered by direct current power sources. The storage battery pack is independent of alternating current, can still normally operate when an alternating current system fails, can continuously supply power to an automatic device, a signal, a control device and a relay protection device, and can also ensure the power consumption of accident illumination. The plant dc system is often regarded as the "heart" of the power plant, and it is seen that the plant dc system plays a significant role in the power plant. Meanwhile, with the continuous development of the power industry, people put higher requirements on the reliability and safety of power supply, and the importance of the emergency safety power supply serving as the last defense line of a protection unit is self-evident.
However, in actual production, since the charging and discharging capability of the storage battery is limited by the power, capacity and charging and discharging states of the storage battery, the problem that the actual standby power supply time is far less than the design time due to insufficient maintenance and management is also easy to occur. Meanwhile, in a unit accident security system, a diesel generator set is widely selected as a unit security power supply, but in practical application, due to the fact that diesel is in a static state for a long time and is not in place for maintenance, and due to the anti-freezing problem of cooling water and fuel in a cold environment, the diesel is not high in starting success rate and not long enough in running time in the accident, and the diesel is unacceptable in the serious accident of the unit. Therefore, the effective, safe and reliable standby for the power plant is an important guarantee for improving the power generation quality of the power plant.
With the continuous deep advancement of the reform of the electric power system in China, the electric auxiliary service market mechanism is gradually perfected and matured, the frequency modulation service provided by the generator set can be compensated from the power grid, and the strength is continuously enhanced. Therefore, under the drive of an economic lever, the current power generation enterprises have enthusiasm to improve and enhance the AGC capability of the unit, and the application of the combined AGC frequency modulation technology of the thermal power unit and the energy storage system has become a new hot spot in the power industry of China. The high-capacity energy storage battery provides the AGC frequency modulation capacity and effect of the power system, and has obvious advantages compared with all traditional power generation equipment.
In conclusion, the important schedule is raised by using the high-capacity energy storage battery for providing AGC frequency modulation for the power system as a standby of the station service power system. Under the background that energy storage frequency modulation is used as a novel and advanced technology to rapidly develop, and engineering projects such as spring bamboo shoots after rain at home and abroad and engineering effects are obvious, taking an energy storage battery for combined frequency modulation as a standby of a main factory building direct current system and a unit security power supply is undoubtedly an effective measure for guaranteeing safe and stable operation of a power system and guaranteeing electric energy quality.
Disclosure of Invention
The invention aims to provide a system for standby power of an energy storage battery based on AGC frequency modulation of a thermal power plant, which has the advantages of high safety reliability, simple wiring mode and capability of providing safe and effective standby power for the plant in time, aiming at the current situations that the capacity of a storage battery of the DC power supply of the thermal power plant is small, the diesel starting success rate is low, the running time is short, and the energy storage frequency modulation is used as a novel advanced technology to rapidly develop.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a system for standby energy storage battery service power based on AGC frequency modulation of a thermal power plant comprises an energy storage system, a main plant direct current system, a unit alternating current security power system and a unit direct current security power system; wherein,
The energy storage system is directly connected to the bus for the high-voltage plant; the direct current system of the main plant is connected to the energy storage system; the unit alternating current safety power supply system is connected to the energy storage system; the unit direct current security power system is connected to the energy storage system.
The invention is further improved in that the energy storage system comprises a first circuit breaker, a dry-type transformer, a bidirectional power conversion device, a second circuit breaker, an energy storage battery pack, a third circuit breaker, a first cable, a fourth circuit breaker, a first chopper, a second cable, a fifth circuit breaker, an inverter, a third cable, a sixth circuit breaker and a second chopper; wherein,
The energy storage battery pack is connected to the bus for the high-voltage factory through the second circuit breaker, the bidirectional power conversion device, the dry-type transformer and the first circuit breaker in sequence.
The invention is further improved in that the direct current system of the main plant comprises a monitoring system, a microcomputer direct current system monitoring device, a direct current system storage battery pack, a first direct current breaker, a second direct current breaker, a third direct current breaker, a fourth direct current breaker, a positive contact bus, a negative contact bus, a fifth direct current breaker, a sixth direct current breaker, a direct current system inverter, a fourth cable, a fifth cable, a positive direct current isolating switch, a negative direct current isolating switch, a positive outgoing bus, a negative outgoing bus, a lightning arrester, a bus voltage and insulation detection device, a positive outgoing circuit breaker, a negative outgoing circuit breaker and an outgoing isolating switch; wherein,
The microcomputer direct current system monitoring device is used for monitoring and transmitting information of the monitoring system and executing commands sent to the microcomputer direct current system monitoring device, so that the microcomputer direct current system monitoring device can carry out mold in, switch out and communication of corresponding information, the direct current system inverter is connected to the positive connection bus and the negative connection bus through a fifth direct current circuit breaker and a sixth direct current circuit breaker respectively, the positive connection bus and the negative connection bus are connected to the positive outgoing bus and the negative outgoing bus through a positive direct current isolating switch and a negative direct current isolating switch respectively, and meanwhile, the direct current feeder is connected to the positive outgoing bus and the negative outgoing bus through a fourth cable and a fifth cable respectively, and the positive outgoing bus and the negative outgoing bus are connected to the positive outgoing bus and the negative outgoing bus through an outgoing isolating switch and a positive outgoing circuit breaker respectively;
The energy storage battery pack is connected to the positive electrode contact bus and the negative electrode contact bus to serve as a standby power supply respectively through a third circuit breaker, a first cable, a fourth circuit breaker, a first chopper and a third direct current circuit breaker and a fourth direct current circuit breaker of the direct current system of the main plant in sequence.
The invention is further improved in that when the positive DC isolating switch and the negative DC isolating switch are in a closed state and the bus voltage and the insulation detection device detect that no voltage exists on the positive outgoing bus and the negative outgoing bus, namely the first DC circuit breaker, the second DC circuit breaker, the fifth DC circuit breaker and the sixth DC circuit breaker are in an open state;
The energy storage battery pack in the energy storage system is put into operation and is used as a standby power supply of the direct current system of the main plant, namely, the third circuit breaker, the fourth circuit breaker, the third direct current breaker and the fourth direct current breaker are all in a closed state, and at the moment, the bus voltage and the insulation detection device detect that voltages exist on the positive outgoing bus and the negative outgoing bus.
The invention further improves that the unit alternating current safety power supply system comprises a desulfurization safety MCC, a first drawer type breaker, a second drawer type breaker, a gas turbine safety MCC, a third drawer type breaker, a fourth drawer type breaker, a boiler safety MCC, a fifth drawer type breaker, a sixth drawer type breaker, an alternating current safety PC section, a seventh drawer type breaker, an eighth drawer type breaker, a safety transformer, a ninth drawer type breaker, a tenth drawer type breaker and a diesel generating unit; wherein,
The safety transformer is connected to an alternating current safety PC section through an eighth drawer type breaker, the diesel generator set is connected to the alternating current safety PC section through a tenth drawer type breaker and a ninth drawer type breaker in sequence, the desulfurization safety MCC is connected to a common power supply desulfurization PC section through a second drawer type breaker, and is connected to a standby power supply alternating current safety PC section through a first drawer type breaker, the steam turbine safety MCC is connected to a common power supply steam turbine PC section through a fourth drawer type breaker, and is connected to a standby power supply alternating current safety PC section through a third drawer type breaker, and the boiler safety MCC is connected to a common power supply boiler PC section through a sixth drawer type breaker, and is connected to a standby power supply alternating current safety PC section through a fifth drawer type breaker;
The energy storage battery pack is connected to the alternating current safety PC section to serve as a standby power supply through a third circuit breaker, a second cable, a fifth circuit breaker, an inverter and a seventh drawer type circuit breaker of the unit alternating current safety power supply system in sequence.
The invention is further improved in that when the first drawer type circuit breaker and the corresponding isolating switch are in a closed state and the desulfurization security MCC is in a voltage loss state, namely, the second drawer type circuit breaker, the eighth drawer type circuit breaker and the ninth drawer type circuit breaker are in an open state, or the second drawer type circuit breaker, the eighth drawer type circuit breaker and the tenth drawer type circuit breaker;
The energy storage battery pack in the energy storage system is put into operation and is used as a standby power supply of the unit alternating current safety power supply system, namely, the third circuit breaker, the fifth circuit breaker and the seventh drawer circuit breaker are all in a closed state, and at the moment, the desulfurization safety MCC voltage is recovered;
When the third drawer type circuit breaker and the corresponding isolating switch are in a closed state and the safety MCC of the gas turbine is in a voltage loss state, namely the fourth drawer type circuit breaker, the eighth drawer type circuit breaker and the ninth drawer type circuit breaker are in an open state, or the fourth drawer type circuit breaker, the eighth drawer type circuit breaker and the tenth drawer type circuit breaker are in an open state;
The energy storage battery pack in the energy storage system is put into operation and is used as a standby power supply of the unit alternating current safety power supply system, namely the third circuit breaker, the fifth circuit breaker and the seventh drawer circuit breaker are all in a closed state, and at the moment, the voltage of the motor safety MCC is recovered;
When the fifth drawer type circuit breaker and the corresponding isolating switch are in a closed state and the boiler security MCC is in a voltage loss state, namely the sixth drawer type circuit breaker, the eighth drawer type circuit breaker and the ninth drawer type circuit breaker are in an open state, or the sixth drawer type circuit breaker, the eighth drawer type circuit breaker and the tenth drawer type circuit breaker are in an open state;
The energy storage battery pack in the energy storage system is put into operation and is used as a standby power supply of the unit alternating current safety power supply system, namely the third circuit breaker, the fifth circuit breaker and the seventh drawer circuit breaker are all in a closed state, and the boiler safety MCC voltage is recovered at the moment.
The invention further improves that the unit direct current safety power supply system comprises a safety storage battery pack, a seventh circuit breaker, an eighth circuit breaker, a direct current safety PC section and an isolating switch; wherein,
The safety storage battery pack supplies power to the direct current safety load through the seventh circuit breaker, the direct current safety PC section and the isolating switch in sequence;
the energy storage battery pack is connected to the direct current safety PC section to serve as a standby power supply through a third circuit breaker, a third cable, a sixth circuit breaker, a second chopper and an eighth circuit breaker of the unit direct current safety power supply system in sequence.
The invention is further improved in that when the direct current security PC section is in voltage loss, namely the seventh circuit breaker is in an open state;
The energy storage battery pack in the energy storage system is put into operation and is used as a standby power supply of the direct current safety power supply system of the unit, namely the third circuit breaker, the sixth circuit breaker and the eighth circuit breaker are all in a closed state, and at the moment, the voltage of the direct current safety PC section is recovered.
Compared with the prior art, the invention has the following advantages:
1. The energy storage system, the main plant direct current system, the unit alternating current security power system and the unit direct current security power system are high in independence, so that the problem that the safety and stability of other parts are affected due to the fact that one part of the energy storage system is failed is avoided, and the reliability of power supply is improved;
2. the system has clear structure and simple wiring, and is particularly applicable to plant power systems of different thermal power plants when the energy storage battery is used as a main plant direct current system and a unit security power system;
3. The energy storage battery pack has large capacity, can provide sufficient spare capacity for the station service system when the AGC joint frequency modulation is not participated, effectively solves the problems of insufficient actual spare capacity, unsuccessful diesel starting, short running time and power-off security change of the conventional battery pack, and further strives for longer time for solving the fault of the station service system to avoid serious accident consequences;
4. the invention adopts the energy storage battery as the back-up switch to switch and operate simply, can solve the problems of insufficient back-up power supply and even losing when the direct current system of the main factory building and the security power supply system of the unit fail, and avoid the danger that the secondary system device and the unit stop working caused by the failure of the direct current system and the security power supply system of the unit in time;
5. the invention can realize the switching of the whole energy storage battery through a set of switch device, thereby reducing the number of switches and the consumption of cables and improving the power supply economy.
In conclusion, the invention has the advantages of low operation and maintenance cost, safety, reliability, strong practicability and convenience for popularization and use.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a schematic diagram of a standby structure of the main plant dc system of the energy storage battery.
Fig. 3 is a schematic diagram of a standby structure of an ac safety power system of an energy storage battery as a unit.
Fig. 4 is a schematic diagram of a standby structure of the energy storage battery as a unit dc security power system.
In the figure: 1-an energy storage system; 2-a direct current system of a main plant; 3-a unit alternating current safety power supply system; 4-a unit direct current safety power supply system; 1-a first circuit breaker; 1-2-dry transformer; 1-3-bi-directional power conversion means (PCS, powerConversion System); 1-4-a second circuit breaker; 1-5-an energy storage battery pack; 1-6-a third circuit breaker; 1-7—a first cable; 1-8-fourth circuit breaker; 1-9—a first chopper; 1-10—a second cable; 1-11-fifth circuit breaker; 1-12-an inverter; 1-13—a third cable; 1-14-sixth circuit breaker; 1-15-and a second chopper; 2-1-a monitoring system; 2-microcomputer direct current system monitoring device; 2-3-direct current system battery pack; 2-4-a first dc breaker; 2-5-a second dc breaker; 2-6-a third direct current breaker; 2-7-fourth direct current breaker; 2-8, an anode connecting bus; 2-9, a negative electrode contact bus; 2-10-fifth direct current breaker; 2-11-sixth dc circuit breaker; 2-12-dc system inverter; 2-13-fourth cable; 2-14-fifth cable; 2-15-positive DC isolating switch; 2-16-negative DC isolating switch; 2-17, an anode outlet bus; 2-18-negative electrode outlet bus; 2-19-lightning arresters; 2-20, bus voltage and insulation detection device; 2-21-positive outlet circuit breaker; 2-22-a negative pole outgoing line breaker; 2-23-outlet isolating switch; 3-1-desulfurizing the safety MCC; 3-2-a first drawer breaker; 3-a second drawer breaker; 3-4-a steam turbine security MCC; 3-5-third drawer breaker; 3-6-fourth drawer type circuit breaker; 3-7-boiler security MCC; 3-8-fifth drawer type circuit breaker; 3-9-sixth drawer type circuit breaker; 3-10-an ac security PC segment; 3-11-seventh drawer type circuit breaker; 3-12-eighth drawer type circuit breaker; 3-13, security changes; 3-14-ninth drawer type circuit breaker; 3-15-tenth drawer type circuit breaker; 3-16-diesel generator set; 4-1, a security storage battery pack; 4-2-seventh circuit breaker; 4-3-eighth circuit breaker; 4-direct current security PC section; 4-5-isolating switch.
Detailed Description
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
As shown in fig. 1, the system for standby power supply of the energy storage battery based on AGC frequency modulation of the thermal power plant provided by the invention comprises an energy storage system 1, a main plant direct current system 2, a unit alternating current security power system 3 and a unit direct current security power system 4;
The energy storage system 1 comprises a first circuit breaker 1-1, a dry-type transformer 1-2, a bidirectional power conversion device (PCS, power Conversion System) 1-3, a second circuit breaker 1-4, an energy storage battery pack 1-5, a third circuit breaker 1-6, a first cable 1-7, a fourth circuit breaker 1-8, a first chopper 1-9, a second cable 1-10, a fifth circuit breaker 1-11, an inverter 1-12, a third cable 1-13, a sixth circuit breaker 1-14 and a second chopper 1-15; the main factory building direct current system 2 comprises a monitoring system 2-1, a microcomputer direct current system monitoring device 2-2, a direct current system storage battery pack 2-3, a first direct current breaker 2-4, a second direct current breaker 2-5, a third direct current breaker 2-6, a fourth direct current breaker 2-7, a positive connection bus 2-8, a negative connection bus 2-9, a fifth direct current breaker 2-10, a sixth direct current breaker 2-11, a direct current system inverter 2-12, a fourth cable 2-13, a fifth cable 2-14, a positive direct current isolating switch 2-15, a negative direct current isolating switch 2-16, a positive outgoing bus 2-17, a negative outgoing bus 2-18, a lightning arrester 2-19, a bus voltage and insulation detection device 2-20, a positive outgoing bus 2-21, a negative outgoing bus 2-22 and an outgoing isolating switch 2-23; the unit alternating current safety power supply system 3 comprises a desulfurization safety MCC3-1, a first drawer type breaker 3-2, a second drawer type breaker 3-3, a gas turbine safety MCC3-4, a third drawer type breaker 3-5, a fourth drawer type breaker 3-6, a boiler safety MCC3-7, a fifth drawer type breaker 3-8, a sixth drawer type breaker 3-9, an alternating current safety PC section 3-10, a seventh drawer type breaker 3-11, an eighth drawer type breaker 3-12, a safety transformer 3-13, a ninth drawer type breaker 3-14, a tenth drawer type breaker 3-15 and a diesel generating unit 3-16; the unit direct current safety power supply system 4 comprises a safety storage battery 4-1, a seventh circuit breaker 4-2, an eighth circuit breaker 4-3, a direct current safety PC section 4-4 and an isolating switch 4-5.
Wherein the energy storage system 1 is directly connected to a high-voltage factory bus; the main plant direct current system 2 is connected to the energy storage system 1 through a third direct current breaker 2-6 and a fourth direct current breaker 2-7; the unit alternating current safety power supply system 3 is connected to the energy storage system 1 through a seventh drawer type breaker 3-11; the unit direct current safety power supply system 4 is connected to the energy storage system 1 through an eighth breaker 4-3; the energy storage battery pack 1-5 is connected to a bus for a high-voltage plant through a second circuit breaker 1-4, a bidirectional power conversion device (PCS, power Conversion System) 1-3, a dry-type transformer 1-2 and a first circuit breaker 1-1 in sequence, meanwhile, the energy storage battery pack 1-5 is connected to an alternating current safety PC section 3-10 through a third circuit breaker 1-6, a first cable 1-7, a fourth circuit breaker 1-8, a first chopper 1-9 and a third direct current circuit breaker 2-6 and a fourth direct current circuit breaker 2-7 of a main plant direct current system 2 respectively, and is used as a standby power supply, and meanwhile, the energy storage battery pack 1-5 is connected to the alternating current safety PC section 3-10 through a third circuit breaker 1-6, a second cable 1-10, a fifth circuit breaker 1-11, an inverter 1-12 and a seventh drawer type circuit breaker 3-11 of a set alternating current power supply system 3 in sequence, and then the energy storage battery pack 1-5 is connected to the direct current safety PC section 1-4 through the third circuit breaker 1-6, the third chopper 1-4 and the eighth circuit breaker 1-4 in sequence.
The storage battery pack 2-3 of the direct current system is respectively connected to the positive connection bus 2-8 and the negative connection bus 2-9 through the first direct current breaker 2-4 and the second direct current breaker 2-5, the microcomputer direct current system monitoring device 2-2 can monitor and transmit information of the monitoring system 2-1, and can execute commands sent to the microcomputer direct current system monitoring device 2-1 by the monitoring system 2-1, so that the microcomputer direct current system monitoring device 2-2 can perform mould input, switch-in, switch-out and communication of corresponding information, the direct current system inverter 2-12 is respectively connected to the positive connection bus 2-8 and the negative connection bus 2-9 through the fifth direct current breaker 2-10 and the sixth direct current breaker 2-11, the positive connection bus 2-8 and the negative connection bus 2-9 are respectively connected to the positive outgoing bus 2-17 and the negative outgoing bus 2-18 through the fifth direct current breaker 2-15 and the negative direct current breaker 2-16, and simultaneously respectively connected to the positive outgoing bus 2-17 and the negative outgoing bus 2-18 through the fourth direct current breaker 2-13 and the fifth direct current breaker 2-17 and the negative outgoing bus 2-18 respectively, the bus voltage and insulation monitoring device 2-20 is connected to the positive outgoing bus 2-17 and the negative outgoing bus 2-18 through the lightning arrester 2-19.
The safety transformer 3-13 is connected to the AC safety PC section 3-10 through an eighth drawer type breaker 3-12, the diesel generator set 3-16 is connected to the AC safety PC section 3-10 through a tenth drawer type breaker 3-15 and a ninth drawer type breaker 3-16 in sequence, the desulfurization safety MCC3-1 is connected to the common power supply desulfurization PC section through a second drawer type breaker 3-3, and is connected to the standby power supply AC safety PC section 3-10 through a first drawer type breaker 3-2, the turbine safety MCC3-4 is connected to the common power supply turbine PC section through a fourth drawer type breaker 3-6, and is connected to the standby power supply AC safety PC section 3-10 through a third drawer type breaker 3-5, and the boiler safety MCC3-7 is connected to the common power supply boiler PC section through a sixth drawer type breaker 3-9, and is connected to the standby power supply AC safety PC section 3-10 through a fifth drawer type breaker 3-8.
The safety storage battery 4-1 supplies power to the direct current safety load through the seventh circuit breaker 4-2, the direct current safety PC section 4-4 and the isolating switch 4-5 in sequence.
In this embodiment, as shown in fig. 2, the positive dc isolating switch 2-15 and the negative dc isolating switch 2-16 are in a closed state, and the bus voltage and insulation detection device 2-20 detects that there is no voltage on the positive outgoing bus 2-17 and the negative outgoing bus 2-18, that is, the first dc breaker 2-4, the second dc breaker 2-5, the fifth dc breaker 2-10 and the sixth dc breaker 2-11 are in an open state; at this time, the energy storage battery pack 1-5 in the energy storage system 1 is put into operation and is used as a standby power supply of the direct current system 2 of the main factory building, namely, the third circuit breaker 1-6, the fourth circuit breaker 1-8, the third direct current circuit breaker 2-6 and the fourth direct current circuit breaker 2-7 are all in a closed state, and the busbar voltage and insulation detection device 2-20 can detect that the voltages on the positive outgoing busbar 2-17 and the negative outgoing busbar 2-18 are restored. In actual use, when the problem of insufficient standby capacity of the storage battery pack 2-3 of the direct current system occurs, the energy storage battery pack 1-5 can be used as standby input of the storage battery pack 2-3 of the direct current system by closing the operation of the third circuit breaker 1-6, the fourth circuit breaker 1-8, the third direct current circuit breaker 2-6 and the fourth direct current circuit breaker 2-7, so that power supply to the direct current system 2 of the main factory building can be recovered.
In this embodiment, taking the gas turbine safety MCC3-4 as an example, when the third drawer type circuit breaker 3-5 and the corresponding isolating switch are in a closed state and the gas turbine safety MCC3-4 is out of voltage, namely, the fourth drawer type circuit breaker 3-6, the eighth drawer type circuit breaker 3-12 and the ninth drawer type circuit breaker 3-14 (or the tenth drawer type circuit breaker 3-15) are all in an open state; the energy storage battery pack 1-5 in the energy storage system 1 is put into operation and is used as a standby power supply of the unit alternating current safety power supply system 3, namely the third circuit breaker 1-6, the fifth circuit breaker 1-11 and the seventh drawer circuit breaker 3-11 are all in a closed state, and at the moment, the voltage of the gas turbine safety MCC3-4 is recovered. In the using process, when the problems of power failure of the safety transformer 3-13, unsuccessful starting of the diesel generator set 3-16 and insufficient running time occur, the energy storage battery set 1-5 is used as standby input of the safety transformer 3-13 and the diesel generator set 3-16 through closing the operation of the third circuit breaker 1-6, the fifth circuit breaker 1-11 and the seventh drawer circuit breaker 3-11, so that the power supply to the set alternating current safety power supply system 3 is recovered.
As shown in fig. 4, in this embodiment, when the dc security PC segment 4-4 loses voltage, that is, the seventh circuit breaker 4-2 is in an open state; the energy storage battery pack 1-5 in the energy storage system 1 is put into operation and is used as a standby power supply of the unit direct current safety power supply system 4, namely the third circuit breaker 1-6, the sixth circuit breaker 1-14 and the eighth circuit breaker 4-3 are all in a closed state, and at the moment, the voltage of the direct current safety PC section 4-4 is recovered. When the problem of insufficient capacity of the safety storage battery 4-1 occurs in the use process, the energy storage battery 1-5 is used as the standby input of the safety storage battery 4-1 through the operation of closing the third circuit breaker 1-6, the sixth circuit breaker 1-14 and the eighth circuit breaker 4-3, so that the power supply to the unit direct current safety power supply system 4 is recovered.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (5)
1. The system for standby energy storage battery service power based on AGC frequency modulation of a thermal power plant is characterized by comprising an energy storage system (1), a main plant direct current system (2), a unit alternating current security power system (3) and a unit direct current security power system (4); wherein,
The energy storage system (1) is directly connected to a bus for a high-voltage plant; the main plant direct current system (2) is connected to the energy storage system (1); the unit alternating current safety power supply system (3) is connected to the energy storage system (1); the unit direct current safety power supply system (4) is connected to the energy storage system (1);
The energy storage system (1) comprises a first circuit breaker (1-1), a dry-type transformer (1-2), a bidirectional power conversion device (1-3), a second circuit breaker (1-4), an energy storage battery pack (1-5), a third circuit breaker (1-6), a first cable (1-7), a fourth circuit breaker (1-8), a first chopper (1-9), a second cable (1-10), a fifth circuit breaker (1-11), an inverter (1-12), a third cable (1-13), a sixth circuit breaker (1-14) and a second chopper (1-15); wherein,
The energy storage battery pack (1-5) is connected to a high-voltage plant bus through a second circuit breaker (1-4), a bidirectional power conversion device (1-3), a dry-type transformer (1-2) and a first circuit breaker (1-1) in sequence;
The main factory building direct current system (2) comprises a monitoring system (2-1), a microcomputer direct current system monitoring device (2-2), a direct current system storage battery pack (2-3), a first direct current breaker (2-4), a second direct current breaker (2-5), a third direct current breaker (2-6), a fourth direct current breaker (2-7), a positive connection bus (2-8), a negative connection bus (2-9), a fifth direct current breaker (2-10), a sixth direct current breaker (2-11), a direct current system inverter (2-12), a fourth cable (2-13), a fifth cable (2-14), a positive direct current isolating switch (2-15), a negative direct current isolating switch (2-16), a positive outgoing bus (2-17), a negative outgoing bus (2-18), a lightning arrester (2-19), a bus voltage and insulation detection device (2-20), a positive outgoing bus (2-21), a negative outgoing bus (2-22) and an outgoing isolating switch (2-23); wherein,
The storage battery pack (2-3) of the direct current system is respectively connected to the positive electrode connecting bus (2-8) and the negative electrode connecting bus (2-9) through a first direct current breaker (2-4) and a second direct current breaker (2-5), the microcomputer direct current system monitoring device (2-2) is used for monitoring and transmitting information of the monitoring system (2-1) and executing commands sent to the monitoring system (2-1) so that the microcomputer direct current system monitoring device (2-2) can carry out opening, opening and communication of corresponding information, the direct current system inverter (2-12) is respectively connected to the positive electrode connecting bus (2-8) and the negative electrode connecting bus (2-9) through a fifth direct current breaker (2-10) and a sixth direct current breaker (2-11), the positive electrode connecting bus (2-8) and the negative electrode connecting bus (2-9) are respectively connected to a positive electrode wire (2-17) and a negative electrode wire (2-17) through a positive electrode direct current isolating switch (2-15) and a negative electrode direct current isolating switch (2-16) and a positive electrode wire (2-17) and a negative electrode wire (2-18) respectively and a positive electrode wire (2-18) and a negative electrode wire (2-18) respectively, the direct current feeder line is connected to the positive outgoing line bus (2-17) and the negative outgoing line bus (2-18) through an outgoing line isolating switch (2-23), a positive outgoing line breaker (2-21) and a negative outgoing line breaker (2-22) respectively, and the bus voltage and insulation detection device (2-20) is connected to the positive outgoing line bus (2-17) and the negative outgoing line bus (2-18) through a lightning arrester (2-19);
The energy storage battery pack (1-5) is connected to an anode contact bus (2-8) and a cathode contact bus (2-9) respectively to serve as a standby power supply through a third circuit breaker (1-6), a first cable (1-7), a fourth circuit breaker (1-8), a first chopper (1-9) and a third direct current circuit breaker (2-6) and a fourth direct current circuit breaker (2-7) of the main plant direct current system (2) in sequence;
The unit alternating current safety power supply system (3) comprises a desulfurization safety MCC (3-1), a first drawer type breaker (3-2), a second drawer type breaker (3-3), a steam turbine safety MCC (3-4), a third drawer type breaker (3-5), a fourth drawer type breaker (3-6), a boiler safety MCC (3-7), a fifth drawer type breaker (3-8), a sixth drawer type breaker (3-9), an alternating current safety PC section (3-10), a seventh drawer type breaker (3-11), an eighth drawer type breaker (3-12), a safety transformer (3-13), a ninth drawer type breaker (3-14), a tenth drawer type breaker (3-15) and a diesel generator unit (3-16); wherein,
The safety transformer (3-13) is connected to the alternating current safety PC section (3-10) through an eighth drawer type breaker (3-12), the diesel generator set (3-16) is connected to the alternating current safety PC section (3-10) through a tenth drawer type breaker (3-15) and a ninth drawer type breaker (3-14) in sequence, the desulfurization safety MCC (3-1) is connected to the common power supply desulfurization PC section through a second drawer type breaker (3-3), meanwhile, the steam turbine safety MCC (3-4) is connected to the standby power supply alternating current safety PC section (3-10) through a first drawer type breaker (3-2), the steam turbine safety MCC (3-4) is connected to the common power supply steam turbine PC section through a fourth drawer type breaker (3-6), meanwhile, the boiler MCC (3-7) is connected to the common power supply alternating current safety PC section through a sixth drawer type breaker (3-9), and meanwhile, the boiler safety MCC (3-7) is connected to the standby power supply alternating current safety PC section (3-10) through a fifth drawer type breaker (3-8);
The energy storage battery pack (1-5) is connected to the alternating current security PC section (3-10) to serve as a standby power supply through a third circuit breaker (1-6), a second cable (1-10), a fifth circuit breaker (1-11), an inverter (1-12) and a seventh drawer type circuit breaker (3-11) of the unit alternating current security power supply system (3) in sequence.
2. The system for standby power supply of the energy storage battery based on AGC frequency modulation of a thermal power plant according to claim 1 is characterized in that when a positive DC isolating switch (2-15) and a negative DC isolating switch (2-16) are in a closed state and a bus voltage and insulation detection device (2-20) detects no voltage on a positive outgoing bus (2-17) and a negative outgoing bus (2-18), namely a first DC breaker (2-4), a second DC breaker (2-5), a fifth DC breaker (2-10) and a sixth DC breaker (2-11) are in an open state;
The energy storage battery pack (1-5) in the energy storage system (1) is put into operation and used as a standby power supply of the main plant direct current system (2), namely, a third circuit breaker (1-6), a fourth circuit breaker (1-8), a third direct current circuit breaker (2-6) and a fourth direct current circuit breaker (2-7) are all in a closed state, and at the moment, the bus voltage and insulation detection device (2-20) detect voltages on the positive electrode outgoing bus (2-17) and the negative electrode outgoing bus (2-18).
3. The system for standby power plant service based on AGC frequency modulation of a thermal power plant according to claim 1 is characterized in that when the first drawer type breaker (3-2) and the corresponding isolating switch are in a closed state and the desulfurization security MCC (3-1) is in a voltage loss state, namely the second drawer type breaker (3-3), the eighth drawer type breaker (3-12) and the ninth drawer type breaker (3-14) are in an open state, or the second drawer type breaker (3-3), the eighth drawer type breaker (3-12) and the tenth drawer type breaker (3-15) are in an open state;
the energy storage battery pack (1-5) in the energy storage system (1) is put into operation and is used as a standby power supply of the unit alternating current safety power supply system (3), namely, the third circuit breaker (1-6), the fifth circuit breaker (1-11) and the seventh drawer circuit breaker (3-11) are all in a closed state, and the voltage of the desulfurization safety MCC (3-1) is recovered at the moment;
When the third drawer type circuit breaker (3-5) and the corresponding isolating switch are in a closed state and the gas turbine security MCC (3-4) is in a voltage loss state, namely the fourth drawer type circuit breaker (3-6), the eighth drawer type circuit breaker (3-12) and the ninth drawer type circuit breaker (3-14) are in an open state, or the fourth drawer type circuit breaker (3-6), the eighth drawer type circuit breaker (3-12) and the tenth drawer type circuit breaker (3-15) are in an open state;
the energy storage battery pack (1-5) in the energy storage system (1) is put into operation and is used as a standby power supply of the unit alternating current safety power supply system (3), namely, the third circuit breaker (1-6), the fifth circuit breaker (1-11) and the seventh drawer circuit breaker (3-11) are all in a closed state, and at the moment, the voltage of the gas turbine safety MCC (3-4) is recovered;
When the fifth drawer type circuit breaker (3-8) and the corresponding isolating switch are in a closed state and the boiler security MCC (3-7) is in a voltage loss state, namely the sixth drawer type circuit breaker (3-9), the eighth drawer type circuit breaker (3-12) and the ninth drawer type circuit breaker (3-14) are in an open state, or the sixth drawer type circuit breaker (3-9), the eighth drawer type circuit breaker (3-12) and the tenth drawer type circuit breaker (3-15) are in an open state;
The energy storage battery pack (1-5) in the energy storage system (1) is put into operation and is used as a standby power supply of the unit alternating current safety power supply system (3), namely, the third circuit breaker (1-6), the fifth circuit breaker (1-11) and the seventh drawer circuit breaker (3-11) are all in a closed state, and at the moment, the voltage of the boiler safety MCC (3-7) is recovered.
4. The system for standby power for a thermal power plant by using an energy storage battery based on AGC frequency modulation of the thermal power plant according to claim 1, wherein the unit direct current safety power supply system (4) comprises a safety storage battery pack (4-1), a seventh circuit breaker (4-2), an eighth circuit breaker (4-3), a direct current safety PC section (4-4) and a disconnecting switch (4-5); wherein,
The safety storage battery pack (4-1) supplies power to the direct current safety load through the seventh circuit breaker (4-2), the direct current safety PC section (4-4) and the isolating switch (4-5) in sequence;
The energy storage battery pack (1-5) is connected to the direct current safety PC section (4-4) to serve as a standby power supply through a third circuit breaker (1-6), a third cable (1-13), a sixth circuit breaker (1-14), a second chopper (1-15) and an eighth circuit breaker (4-3) of the unit direct current safety power supply system (4) in sequence.
5. The system for standby power for energy storage batteries based on AGC frequency modulation of a thermal power plant according to claim 4 is characterized in that when the direct current security PC section (4-4) is out of voltage, the seventh circuit breaker (4-2) is in an open state;
the energy storage battery pack (1-5) in the energy storage system (1) is put into operation and is used as a standby power supply of the unit direct current security power supply system (4), namely, the third circuit breaker (1-6), the sixth circuit breaker (1-14) and the eighth circuit breaker (4-3) are all in a closed state, and at the moment, the voltage of the direct current security PC section (4-4) is recovered.
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