CN115021279A - Fire-storage combined frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot - Google Patents
Fire-storage combined frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot Download PDFInfo
- Publication number
- CN115021279A CN115021279A CN202210574219.7A CN202210574219A CN115021279A CN 115021279 A CN115021279 A CN 115021279A CN 202210574219 A CN202210574219 A CN 202210574219A CN 115021279 A CN115021279 A CN 115021279A
- Authority
- CN
- China
- Prior art keywords
- frequency modulation
- subsystem
- energy storage
- response
- boiler
- 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.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
-
- 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
-
- 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
-
- 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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
- H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
- H02J2310/58—The condition being electrical
- H02J2310/60—Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a fire-storage combined frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot, which comprises: the composite energy storage subsystem is used for realizing the aim of the batteries of different types to participate in the frequency modulation instruction requirements of different types; the condensate throttling frequency modulation response subsystem participates in auxiliary regulation when the composite energy storage subsystem cannot meet the frequency modulation response requirement of the power grid; the frequency modulation response subsystem controls the composite energy storage subsystem, the condensate water throttling frequency modulation response subsystem, the boiler overshoot control subsystem and the main steam regulating valve of the steam turbine to participate in frequency modulation response together according to the received frequency modulation instruction and the actual output of the unit; and the boiler overshoot control subsystem sets overshoot on the basis of the load instruction and adjusts the amount of water and coal entering the boiler when the frequency modulation response subsystem receives a long-term large-amplitude frequency modulation instruction. Compared with the prior art, the invention has the advantages of reducing the power generation coal consumption and the equipment abrasion to the maximum extent, prolonging the service life of the battery of the energy storage system, reducing the initial investment cost and the like.
Description
Technical Field
The invention relates to the technical field of frequency modulation of thermal power generating units, in particular to a fire-storage combined frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot.
Background
With the further continuous and rapid increase of the installed capacity of new energy electric power such as wind power, photovoltaic and hydropower, the fluctuation and intermittence of the new energy power generation output have increasingly serious influence on the stable operation of the power grid. In order to ensure the safety and stability of the operation of the power grid, the power grid supporting power supply is used, the frequency modulation instructions received by the thermal power generating unit are more frequent, and the frequency modulation depth requirement is higher and higher.
The thermal power generating unit generally participates in frequency modulation response through a load adjusting mode of main steam throttle throttling, and the mode has the advantages of timely response and high adjusting capacity, but also has the defects of high throttling loss, high coal consumption for power generation and serious equipment abrasion. In recent years, a fire storage combined frequency modulation technology appears, as shown in fig. 2, in the technology, a lithium iron phosphate battery energy storage system is usually adopted to assist in participating in frequency modulation response of a thermal power generating unit, so that the opening degree of a main steam regulating valve is released to a certain degree, and the throttling loss of the valve is reduced; however, through practical application, the combined fire storage frequency modulation technology generally has the defects of large battery capacity, high initial investment, short battery life and poor economy, and meanwhile, the opening capacity of the main steam release regulating valve is limited, and the throttling loss of the valve is not obviously improved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a combined fire and storage frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot.
The purpose of the invention can be realized by the following technical scheme:
fire storage combined frequency modulation system based on compound energy storage, condensate frequency modulation and boiler overshoot, this system is used for improving the load regulation mode that thermal power generating unit throttled through the main steam governing door and participates in the frequency modulation response, and the boiler passes through the main steam governing door and connects the steam turbine, and the steam turbine is connected lowly and is added the heat exchanger, and the steam turbine is connected to the one end of condenser, and the other end is connected lowly through congealing the pump and is added the heat exchanger, and the boiler water supply equipment is connected to the other end that lowly adds the heat exchanger, and this system specifically includes:
the composite energy storage subsystem is used for realizing the aim of the batteries of different types to participate in the frequency modulation instruction requirements of different types;
the condensate throttling frequency modulation response subsystem is used for participating in auxiliary regulation when the composite energy storage subsystem cannot meet the frequency modulation response requirement of the power grid;
the frequency modulation response subsystem is used for controlling the composite energy storage subsystem, the condensate throttling frequency modulation response subsystem, the boiler overshoot control subsystem and the main steam regulating valve of the steam turbine to participate in frequency modulation response together according to the received frequency modulation instruction and the actual output of the unit;
and the boiler overshoot control subsystem is connected with the regulating valves among the boiler, the water supply equipment and the coal supply equipment and is used for setting overshoot on the basis of the load instruction and regulating the amount of water and coal entering the boiler when the frequency modulation response subsystem receives a long-term large-amplitude frequency modulation instruction.
In the invention, the composite energy storage subsystem comprises a first battery for participating in a short-time high-rate power grid frequency modulation instruction, namely primary frequency modulation, and a second battery for participating in a long-time low-rate power grid frequency modulation instruction, namely secondary frequency modulation.
The composite energy storage subsystem further comprises a first battery, a second battery, DC/DC converters, DC/AC inversion rectifiers and a BESS controller, wherein the first battery and the second battery are respectively connected with one DC/DC converter in series, the output ends of the two DC/DC converters are connected with the DC/AC inversion rectifiers, the DC/AC inversion rectifiers are connected with a high-voltage transformer for plant use, the high-voltage transformer for plant use is connected between a generator and a main transformer, one end of the BESS controller is connected with a load, the DC/AC inversion rectifiers, the first battery, the second battery and the DC/DC converters, and the other end of the BESS controller is connected with a frequency modulation response subsystem.
The system comprises a condensate throttling frequency modulation response subsystem, a low-pressure heater bypass door and a connecting pipe system, wherein the condensate throttling frequency modulation response subsystem comprises a condensate throttling response module, a low-pressure heater bypass door and a connecting pipe system, the condensate throttling response module is used for participating in response according to the capacity of the condensate throttling frequency modulation response subsystem, the low-pressure heater bypass door is used for adjusting the amount of condensate entering a low-pressure heater, the condensate throttling response module is connected with the low-pressure heater bypass door, one end of the low-pressure heater bypass door is connected between the low-pressure heater and a condensate pump, and the other end of the low-pressure heater bypass door is connected into boiler water supply equipment; the condensate throttling frequency modulation response subsystem adjusts the amount of condensate entering the low-pressure heater by controlling the opening of the bypass door of the low-pressure heater, and further indirectly adjusts the steam extraction amount of the steam turbine.
According to the invention, the frequency modulation response subsystem participates in frequency modulation response jointly according to the received frequency modulation instruction, the unit actual output control composite energy storage subsystem, the condensate throttling frequency modulation response subsystem, the boiler overshoot control subsystem and the steam turbine main steam control valve, and comprises a primary frequency modulation mode and a secondary frequency modulation mode.
Further, the specific contents that the frequency modulation response subsystem controls the composite energy storage subsystem, the condensate throttling frequency modulation response subsystem, the boiler overshoot control subsystem and the main steam control valve of the steam turbine to jointly participate in the frequency modulation response according to the received frequency modulation instruction and the actual output of the unit comprise that:
the frequency modulation response subsystem sends the instruction to a BESS controller of the composite energy storage subsystem, the BESS controller calculates a power set value of the composite energy storage subsystem by combining the charge state of the first battery, and feeds the set value back to the frequency modulation response subsystem;
the frequency modulation response subsystem feeds back the primary frequency modulation response demand instruction to the condensate throttling response module according to the difference value between the primary frequency modulation response demand instruction and the set value of the first battery energy storage system; the condensate throttling response module adjusts the flow of condensate according to key operation parameters, further controls the amount of steam entering the low-pressure heater and participates in primary frequency modulation response;
when the primary frequency modulation requirement exceeds the frequency modulation response capability of the composite energy storage subsystem and the condensate throttling response module, if the primary frequency modulation requirement is a load reduction requirement, the primary frequency modulation response requirement is met by reducing the opening degree of a main steam throttle; if the load is required to be increased, primary frequency modulation assessment cost is generated.
Further, the specific contents that the frequency modulation response subsystem controls the composite energy storage subsystem, the condensate throttling frequency modulation response subsystem, the boiler overshoot control subsystem and the main steam control valve of the steam turbine to jointly participate in the frequency modulation response according to the received frequency modulation command and the actual output of the unit comprise that:
the frequency modulation response subsystem generates a load demand instruction according to the secondary frequency modulation instruction of the power grid and the actual load of the unit, and transmits the load demand instruction to a BESS controller of the composite energy storage subsystem, and the BESS controller calculates a power set value of the composite energy storage subsystem by combining the charge state of the second battery and feeds the set value back to the frequency modulation response subsystem;
the frequency modulation response subsystem feeds back the secondary frequency modulation instruction to the condensate throttling response module according to the difference value between the secondary frequency modulation instruction and the set value of the second battery energy storage system; the condensate throttling response module adjusts the flow of condensate according to key operation parameters, so as to control the amount of steam entering the low-pressure heater and participate in response;
when the secondary frequency modulation instruction exceeds the capabilities of the composite energy storage subsystem and the condensate throttling response module, if the secondary frequency modulation instruction is a load reduction demand, the demand is met by reducing the opening degree of a main steam control valve; if the load is required to be increased, secondary frequency modulation assessment cost is generated;
when the frequency modulation response subsystem receives a frequency modulation command which is greater than 50% of the rated power of the composite energy storage system for two continuous minutes, the secondary frequency modulation command is issued to the boiler overshoot control subsystem, the boiler overshoot control subsystem superposes overshoot on the secondary frequency modulation command, the amount of water and coal entering the boiler is controlled, and the load of the boiler of the thermal power generating unit is overshot.
As a preferred scheme, the first battery is a carbon-based capacitor battery, and the second battery is a lithium iron phosphate battery.
Compared with the prior art, the fire storage combined frequency modulation system and the control method provided by the invention at least have the following beneficial effects:
1) compared with the traditional thermal power generating unit frequency modulation response mode, the fire-storage combined frequency modulation system disclosed by the invention combines composite energy storage, condensed water frequency modulation and boiler overshoot, can realize the full-open operation of a main steam regulating valve of the thermal power generating unit, reduces the throttling loss of the valve, and realizes coal and carbon saving;
2) the fire storage combined frequency modulation system integrates the advantages of high multiplying power and long service life of a carbon-based capacitor and high energy density and low cost of a lithium iron phosphate battery, and realizes the targeted participation of different types of batteries in different types of frequency modulation instruction requirements through the composite energy storage subsystem;
3) the invention combines condensed water frequency modulation and boiler overshoot, can meet the requirement of power grid frequency modulation to the maximum extent, and simultaneously realizes the optimization of the capacity configuration and the service life of the composite energy storage subsystem.
Drawings
FIG. 1 is a schematic structural diagram of a frequency modulation system of a conventional thermal power generating unit in the prior art;
FIG. 2 is a schematic structural diagram of a conventional fire and storage combined frequency modulation system in the prior art;
FIG. 3 is a schematic structural diagram of a fire-storage combined frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot in the embodiment.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Examples
The invention relates to a fire-storage combined frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot, which improves the mode that the traditional thermal power generating unit participates in frequency modulation response in a load adjustment mode of main steam throttle throttling. Specifically, the method comprises the following steps:
the composite energy storage subsystem comprises: carbon-based capacitor batteries, lithium iron phosphate batteries, DC/DC converters, DC/AC inverter rectifiers, BESS controllers and the like. The carbon-based capacitor battery has the characteristics of high power density, long cycle life and high unit cost, and is mainly responsible for participating in a short-time high-rate power grid frequency modulation instruction (mainly primary frequency modulation); the lithium iron phosphate battery has the characteristics of low power density, high capacity density and low unit cost, and is mainly responsible for participating in long-term low-rate power grid frequency modulation instructions (mainly secondary frequency modulation). As shown in fig. 2, the carbon-based capacitor battery and the lithium iron phosphate battery are respectively connected in series with a DC/DC converter, the output ends of the two DC/DC converters are connected with a DC/AC inverter rectifier, the DC/AC inverter rectifier is connected with a high-voltage station transformer, and the high-voltage station transformer is connected between a generator and a main transformer. And the BESS controller is respectively connected with the load, the DC/AC inverter rectifier, the carbon-based capacitor battery, the lithium iron phosphate battery and each DC/DC converter and is used for controlling the operation of each device. The other end of the BESS controller is connected with the frequency modulation response subsystem.
The condensate throttling frequency modulation response subsystem mainly comprises: the condensate throttling response module, the low-pressure heater bypass door, the connecting pipe system and the like are mainly responsible for assisting in participating in primary frequency modulation and secondary frequency modulation response; namely, when the composite energy storage subsystem cannot meet the requirement of power grid frequency modulation response due to the limitation of battery capacity or configured power, the condensed water throttling frequency modulation response subsystem participates in auxiliary regulation. As shown in fig. 3, the boiler is connected with a steam turbine through a main steam regulating valve, the steam turbine is connected with a low pressure heater, one end of the condenser is connected with the steam turbine, the other end of the condenser is connected with the low pressure heater through a condensing pump, and the other end of the low pressure heater is connected with boiler water supply equipment; and the condensate throttling response module is connected with the low-pressure heater bypass door and used for participating in response according to the capacity of the condensate throttling frequency modulation subsystem. One end of the low-pressure heater bypass door is connected between the low-pressure heater heat exchanger and the condensate pump, and the other end of the low-pressure heater bypass door is connected to boiler water supply equipment.
According to the design, the main working principle of the condensed water throttling frequency modulation response subsystem is as follows: the amount of condensed water entering the low-pressure heater is adjusted by controlling the opening of the bypass door of the low-pressure heater, so that the steam extraction amount of the steam turbine is indirectly adjusted, and the purpose of adjusting the output of the steam turbine is achieved. Specifically, when the output of the steam turbine needs to be reduced, the opening of the bypass of the low-pressure heater is reduced, the inflow of the condensed water of the low-pressure heater is increased, and in order to maintain the outlet temperature of the condensed water of the low-pressure heater, the system automatically increases the steam extraction amount of the steam turbine, and the output of the steam turbine is reduced.
The generator is provided with water supply equipment and coal supply equipment for generating electricity. Regulating valves are respectively arranged between the boiler and the water supply equipment and between the boiler and the coal supply equipment, and the boiler overshoot control subsystem is connected with each regulating valve. The boiler overshoot control subsystem has the functions of: when the frequency modulation response subsystem receives a frequency modulation command which is greater than 50% of the rated power of the composite energy storage system for 2 minutes continuously, the boiler overshoot control subsystem sets a certain overshoot on the basis of the load command and adjusts the amount of water and coal entering the boiler. By the aid of the boiler overshoot control subsystem, on one hand, the load response time of the boiler can be shortened, and the capacity configuration requirement of the composite energy storage subsystem is reduced; on the other hand, when the composite energy storage subsystem is subjected to long-term large-amplitude frequency modulation response through reasonable overshoot setting, long-term unidirectional load adjustment (namely, long-term charging or long-term discharging) of the energy storage system is avoided, deep charging and discharging of the energy storage system can also be avoided, the energy storage system is maintained in a reasonable charge state, and the service life of the energy storage system is prolonged.
The frequency modulation response subsystem is used as a control module of the whole frequency modulation response system, the composite energy storage subsystem, the condensate throttling frequency modulation response subsystem, the boiler overshoot control subsystem and the main steam regulating gate of the steam turbine are controlled to participate in frequency modulation response according to the received frequency modulation instruction, the actual output of the unit, and the main steam regulating gate of the thermal power unit is kept to be operated fully during the whole frequency modulation response process to the greatest extent, so that coal saving and carbon reduction are realized. The method comprises the following specific steps:
(1) for primary frequency modulation, the frequency modulation response subsystem issues an instruction to a BESS controller of the composite energy storage subsystem, the BESS controller calculates a set power value of the composite energy storage subsystem by combining the charge state of the carbon-based capacitor battery, and feeds the set power value back to the frequency modulation response subsystem; the frequency modulation response subsystem feeds back the primary frequency modulation response demand instruction to the condensate throttling response module according to the difference value between the primary frequency modulation response demand instruction and the set value of the carbon-based capacitive energy storage system; the condensate throttling response module adjusts the condensate flow appropriately according to key operation parameters such as the condensate flow, the condensate temperature and the like, so that the steam quantity entering the low-pressure heater is controlled, and primary frequency modulation response is participated. The boiler overshoot control subsystem does not participate in primary frequency modulation response, and when the primary frequency modulation requirement exceeds the frequency modulation response capability of the composite energy storage subsystem and the condensate throttling response module, if the primary frequency modulation requirement is a load reduction requirement, the primary frequency modulation response requirement can be further met by reducing the opening degree of a main steam throttle; if the load is increased, a certain primary frequency modulation examination expense is generated.
(2) For secondary frequency modulation, the frequency modulation response subsystem generates a load demand instruction according to a power grid secondary frequency modulation instruction and the actual load of the unit, and sends the load demand instruction to a BESS controller of the composite energy storage subsystem, the BESS controller calculates a power set value of the composite energy storage subsystem by combining the charge state of the lithium iron phosphate battery, and feeds the set value back to the frequency modulation response subsystem; the frequency modulation response subsystem feeds back the secondary frequency modulation instruction to the condensed water throttling response module according to the difference value between the secondary frequency modulation instruction and the set value of the lithium iron phosphate battery energy storage system; the condensate throttling response module adjusts the condensate flow properly according to key operation parameters such as the condensate flow, the condensate temperature and the like, and then controls the steam amount entering the low-pressure heater to participate in response. When the secondary frequency modulation instruction exceeds the response capacity of the composite energy storage subsystem and the condensate water throttling frequency modulation, if the load reduction requirement is met, the requirement can be further met by reducing the opening degree of the main steam control valve; if the load is increased, certain secondary frequency modulation examination cost is generated. In addition, when the frequency modulation response subsystem receives a frequency modulation command which is greater than 50% of the rated power of the composite energy storage system for 2 minutes continuously, the frequency modulation response subsystem issues a secondary frequency modulation command to the boiler overshoot control subsystem, and the boiler overshoot control subsystem superposes a certain overshoot on the basis of the secondary frequency modulation command to control the amount of water and coal entering the boiler and overshoot the boiler load of the thermal power generating unit. The composite energy storage subsystem can avoid long-term unidirectional load regulation (namely, long-term charging or long-term discharging) of the energy storage system when the composite energy storage subsystem is subjected to long-term large-amplitude frequency modulation response through reasonable overshoot setting, and can also avoid deep charging and discharging of the energy storage system, so that the energy storage system is maintained in a reasonable charge state, and the service life of the energy storage system is prolonged.
Compared with the traditional thermal power unit frequency modulation response mode, the fire storage combined frequency modulation system can realize the full-open operation of the main steam regulating valve of the thermal power unit, reduce the throttling loss of the valve and realize coal saving and carbon reduction; in addition, the fire storage combined frequency modulation system also integrates the advantages of high multiplying power and long service life of the carbon-based capacitor and the advantages of high energy density and low cost of the lithium iron phosphate battery, and the composite energy storage subsystem realizes the targeted participation of different types of batteries in different types of frequency modulation instruction requirements; in addition, the capacity configuration and the service life of the composite energy storage subsystem are optimized while the requirement of power grid frequency modulation is met to the maximum extent by combining condensed water frequency modulation and boiler overshoot.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. Fire storage combined frequency modulation system based on compound energy storage, condensate frequency modulation and boiler overshoot for improve the load control mode that thermal power generating unit throttled through the main steam governing valve and participate in the frequency modulation response, the boiler passes through the main steam governing valve and connects the steam turbine, and the steam turbine is connected and is hanged down the heat exchanger, and the steam turbine is connected to the one end of condenser, and the other end hangs down the heat exchanger through congealing the pump connection, hangs down the other end that adds the heat exchanger and connects boiler water supply equipment, its characterized in that, this system includes:
the composite energy storage subsystem is used for realizing the aim of the batteries of different types to participate in the frequency modulation instruction requirements of different types;
the condensate throttling frequency modulation response subsystem is used for participating in auxiliary regulation when the composite energy storage subsystem cannot meet the frequency modulation response requirement of the power grid;
the frequency modulation response subsystem is used for controlling the composite energy storage subsystem, the condensate throttling frequency modulation response subsystem, the boiler overshoot control subsystem and the main steam regulating valve of the steam turbine to participate in frequency modulation response together according to the received frequency modulation instruction and the actual output of the unit;
and the boiler overshoot control subsystem is connected with the regulating valves among the boiler, the water supply equipment and the coal supply equipment and is used for setting overshoot on the basis of the load instruction and regulating the amount of water and coal entering the boiler when the frequency modulation response subsystem receives a long-term large-amplitude frequency modulation instruction.
2. The combined fire and storage frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot according to claim 1, wherein the composite energy storage subsystem comprises a first battery for participating in a short-term high-rate grid frequency modulation command, i.e. primary frequency modulation, and a second battery for participating in a long-term low-rate grid frequency modulation command, i.e. secondary frequency modulation.
3. The combined fire and storage frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot according to claim 2, wherein the composite energy storage subsystem further comprises a first battery, a second battery, a DC/DC converter, a DC/AC inverter rectifier and a BESS controller, the first battery and the second battery are respectively connected in series with a DC/DC converter, the output ends of the two DC/DC converters are connected with the DC/AC inverter rectifier, the DC/AC inverter rectifier is connected with a high-voltage service transformer, the high-voltage service transformer is connected between a generator and a main transformer, one end of the BESS controller is respectively connected with the load, the DC/AC inverter rectifier, the first battery, the second battery and each DC/DC converter, and the other end of the BESS controller is connected with the frequency modulation response subsystem.
4. The combined fire and storage frequency modulation system based on the composite energy storage, the condensate frequency modulation and the boiler overshoot is characterized in that the condensate throttling frequency modulation response subsystem comprises a condensate throttling response module, a low-pressure heater bypass door and a connecting pipe system, wherein the condensate throttling response module is used for participating in response according to the capacity of the condensate throttling frequency modulation response subsystem, the low-pressure heater bypass door is used for adjusting the amount of condensate entering the low-pressure heater, the condensate throttling response module is connected with the low-pressure heater bypass door, one end of the low-pressure heater bypass door is connected between the low-pressure heater and the condensate pump, and the other end of the low-pressure heater bypass door is connected with boiler water supply equipment; the condensate throttling frequency modulation response subsystem adjusts the amount of condensate entering the low-pressure heater by controlling the opening of the bypass door of the low-pressure heater, and further indirectly adjusts the steam extraction amount of the steam turbine.
5. The combined fire and storage frequency modulation system based on the composite energy storage, the condensed water frequency modulation and the boiler overshoot is characterized in that the frequency modulation response subsystem controls the composite energy storage subsystem, the condensed water throttling frequency modulation response subsystem, the boiler overshoot control subsystem and the main steam regulating door of the steam turbine to jointly participate in the frequency modulation response according to the received frequency modulation command and the actual output of the unit, and comprises a joint participation primary frequency modulation mode and a joint participation secondary frequency modulation mode.
6. The combined fire and storage frequency modulation system based on the composite energy storage, the condensed water frequency modulation and the boiler overshoot is characterized in that the frequency modulation response subsystem controls the composite energy storage subsystem, the condensed water throttling frequency modulation response subsystem, the boiler overshoot control subsystem and the main steam regulating gate of the steam turbine to jointly participate in the frequency modulation response according to the received frequency modulation command and the actual output of the unit, and the specific contents of the joint participation in the primary frequency modulation mode are as follows:
the frequency modulation response subsystem sends the instruction to a BESS controller of the composite energy storage subsystem, the BESS controller calculates a power set value of the composite energy storage subsystem by combining the charge state of the first battery, and feeds the set value back to the frequency modulation response subsystem;
the frequency modulation response subsystem feeds back the primary frequency modulation response demand instruction to the condensate throttling response module according to the difference value between the primary frequency modulation response demand instruction and the set value of the first battery energy storage system; the condensate throttling response module adjusts the flow of condensate according to key operation parameters, further controls the amount of steam entering the low-pressure heater and participates in primary frequency modulation response;
when the primary frequency modulation requirement exceeds the frequency modulation response capability of the composite energy storage subsystem and the condensate throttling response module, if the primary frequency modulation requirement is a load reduction requirement, the primary frequency modulation response requirement is met by reducing the opening degree of a main steam throttle; if the load is required to be increased, primary frequency modulation assessment cost is generated.
7. The combined fire and storage frequency modulation system based on the composite energy storage, the condensed water frequency modulation and the boiler overshoot is characterized in that the frequency modulation response subsystem controls the composite energy storage subsystem, the condensed water throttling frequency modulation response subsystem, the boiler overshoot control subsystem and the main steam regulating gate of the steam turbine to jointly participate in the frequency modulation response according to the received frequency modulation command and the actual output of the unit, and the specific contents of the joint participation in the secondary frequency modulation mode are as follows:
the frequency modulation response subsystem generates a load demand instruction according to the secondary frequency modulation instruction of the power grid and the actual load of the unit, and transmits the load demand instruction to a BESS controller of the composite energy storage subsystem, and the BESS controller calculates a power set value of the composite energy storage subsystem by combining the charge state of the second battery and feeds the set value back to the frequency modulation response subsystem;
the frequency modulation response subsystem feeds back the secondary frequency modulation instruction to the condensate throttling response module according to the difference value between the secondary frequency modulation instruction and the set value of the second battery energy storage system; the condensate throttling response module adjusts the flow of condensate according to key operation parameters, so as to control the amount of steam entering the low-pressure heater and participate in response;
when the secondary frequency modulation instruction exceeds the capabilities of the composite energy storage subsystem and the condensate throttling response module, if the secondary frequency modulation instruction is a load reduction demand, the demand is met by reducing the opening degree of a main steam control valve; if the load is required to be increased, secondary frequency modulation assessment cost is generated;
when the frequency modulation response subsystem receives a frequency modulation command which is greater than 50% of the rated power of the composite energy storage system for two continuous minutes, the secondary frequency modulation command is issued to the boiler overshoot control subsystem, the boiler overshoot control subsystem superposes overshoot on the basis of the secondary frequency modulation command, the amount of water and coal entering the boiler is controlled, and the load of the boiler of the thermal power generating unit is overshot.
8. The combined fire and storage frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot according to claim 2, wherein the first battery is a carbon-based capacitive battery, and the second battery is a lithium iron phosphate battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210574219.7A CN115021279A (en) | 2022-05-24 | 2022-05-24 | Fire-storage combined frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210574219.7A CN115021279A (en) | 2022-05-24 | 2022-05-24 | Fire-storage combined frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115021279A true CN115021279A (en) | 2022-09-06 |
Family
ID=83068604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210574219.7A Pending CN115021279A (en) | 2022-05-24 | 2022-05-24 | Fire-storage combined frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115021279A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116247720A (en) * | 2022-12-02 | 2023-06-09 | 国电环境保护研究院有限公司 | Control device for fire-storage combined frequency modulation and fire-storage combined frequency modulation system |
-
2022
- 2022-05-24 CN CN202210574219.7A patent/CN115021279A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116247720A (en) * | 2022-12-02 | 2023-06-09 | 国电环境保护研究院有限公司 | Control device for fire-storage combined frequency modulation and fire-storage combined frequency modulation system |
| CN116247720B (en) * | 2022-12-02 | 2023-11-24 | 国电环境保护研究院有限公司 | Control device for fire-storage combined frequency modulation and fire-storage combined frequency modulation system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3218709U (en) | Power grid frequency modulation system based on electrode-type boiler | |
| WO2019205561A1 (en) | Cchp micro-grid structure including compressed air energy storage and operation method therefor | |
| CN107612001B (en) | Power grid frequency modulation system for combining electric compressor with electric power storage facility of thermal power plant | |
| CN206845247U (en) | One kind enhancing power plant flexibility therrmodynamic system | |
| CN111478376A (en) | Thermal power generating unit coordinated control peak shaving frequency modulation system and method | |
| CN111206970B (en) | Peak regulating system utilizing steam jet and steam extractor in thermal power plant and control method | |
| CN109931117B (en) | System combining unit bypass with external peak regulation and frequency modulation equipment | |
| CN113175699B (en) | Distributed heating system based on comprehensive utilization of various clean energy | |
| CN107370156B (en) | Power grid frequency modulation system based on electrode boiler | |
| CN115717845A (en) | Method for improving peak regulation capacity of thermal power generating unit by fused salt energy storage | |
| CN110991735A (en) | Optimal scheduling method of combined heat and power system considering AA-CAES (advanced computer aided engineering) | |
| CN112983565A (en) | Thermal power generating unit steam extraction auxiliary frequency modulation peak regulation system based on heat storage | |
| CN115021279A (en) | Fire-storage combined frequency modulation system based on composite energy storage, condensed water frequency modulation and boiler overshoot | |
| CN207598303U (en) | The system that a kind of unit bypass combines external peak-frequency regulation equipment | |
| CN108678819B (en) | System for realizing thermal decoupling and rapid peak shaving by utilizing bypass | |
| CN110439642B (en) | Low-temperature waste heat power generation system with auxiliary electrode boiler participating in peak regulation of power plant | |
| CN208073573U (en) | A kind of system for realizing thermoelectricity decoupling and quick peak regulation using bypass | |
| CN115149552B (en) | Control method of alternating-current coupling off-grid wind power hydrogen production system | |
| CN115234328B (en) | Molten salt heat storage depth peak regulation system of generator set and working method thereof | |
| CN115789616A (en) | Control method for improving peak regulation capacity of thermal power generating unit through fused salt energy storage | |
| CN109638859B (en) | Optimization control method for real-time safety correction of electric power of gateway of multi-energy system | |
| CN113819070B (en) | Variable-frequency optimization energy-saving method and system for condensate pump of steam turbine unit | |
| CN210509313U (en) | Low-temperature waste heat power generation system with auxiliary electrode boiler participating in power plant peak regulation | |
| CN209767161U (en) | System for synchronously participating in deep peak regulation and frequency modulation of thermal power plant in multidimensional way by utilizing flywheel battery | |
| CN113595105A (en) | Method and system for realizing power grid frequency modulation by utilizing adiabatic compressed air energy storage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |