CN214412308U - Auxiliary frequency modulation device of thermal power plant based on energy storage equipment - Google Patents
Auxiliary frequency modulation device of thermal power plant based on energy storage equipment Download PDFInfo
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- CN214412308U CN214412308U CN202023341231.9U CN202023341231U CN214412308U CN 214412308 U CN214412308 U CN 214412308U CN 202023341231 U CN202023341231 U CN 202023341231U CN 214412308 U CN214412308 U CN 214412308U
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Abstract
The utility model discloses an auxiliary frequency modulation device of a thermal power plant based on energy storage equipment, which relates to the technical field of frequency modulation of the thermal power plant and comprises a main generator set, a main transformer, a first main switch of a power grid, a first electric energy converter, a first switch, a second switch, an energy storage device and an energy storage transformer; the main generator set is electrically connected with a power frequency power grid through a main transformer and a first power grid main switch; the main generator set is electrically connected with the energy storage transformer, the energy storage transformer is electrically connected with the first electric energy converter through the second switch, the first electric energy converter is electrically connected with the first switch, and the first switch is electrically connected with the energy storage device. The utility model discloses a frequency modulation system, sensitive, quick, high-efficient, scalability is strong, can improve thermal power factory primary control, AGC's regulation performance and energy utilization efficiency.
Description
Technical Field
The utility model relates to a frequency modulation technical field of thermal power plant especially relates to an auxiliary frequency modulation device of thermal power plant based on energy storage equipment.
Background
In daily work of a grid-connected thermal power plant, functions, performances and auxiliary services of grid-connected operation need to be provided, wherein the functions, performances and auxiliary services comprise frequency modulation services such as primary frequency modulation and Automatic Generation Control (AGC).
The primary frequency modulation is an automatic control process that when the frequency of the power grid deviates from a rated value, a control system of a unit in the power grid automatically controls the increase and decrease of the active power of the unit, limits the change of the power grid frequency and enables the power grid frequency to be stable. When the frequency of the power grid is increased, the primary frequency modulation function requires the unit to rapidly reduce the load by means of heat storage and the like, and conversely, the unit rapidly increases the load. The assessment indexes of the primary frequency modulation generally comprise correct action rate, performance indexes and the like.
Automatic Generation Control (AGC) refers to a service that a generator set tracks a power scheduling instruction within a specified output adjustment range, and adjusts the generated output in real time according to a certain adjustment rate so as to meet the requirements of power system frequency and tie line power control. The evaluation indexes of the AGC generally comprise response time, regulation rate, regulation precision and the like.
The primary frequency modulation and AGC of the thermal power plant act on a thermodynamic system through thermal control, a large response dead zone or an adjustment dead zone exists, the response time is long (generally reaching tens of seconds), the response speed or the adjustment rate is slow, and the energy conversion and utilization efficiency is relatively low.
Therefore, those skilled in the art are dedicated to develop an auxiliary frequency modulation device of a thermal power plant based on an energy storage device to improve the adjustment performance and energy utilization efficiency of primary frequency modulation and AGC of the thermal power plant, so that the device is sensitive, fast and efficient.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defect of prior art, the utility model aims to solve the technical problem how to realize improving thermal power factory primary frequency modulation, AGC's regulation performance and energy utilization efficiency, make thermal power factory's primary frequency modulation, AGC's regulation performance sensitive more, quick, high-efficient.
In order to achieve the purpose, the utility model provides an auxiliary frequency modulation device of a thermal power plant based on energy storage equipment, which comprises a main generator set, a main transformer, a first power grid main switch, a power frequency power grid, a first electric energy converter, a first switch, a second switch, an energy storage device and an energy storage transformer; the main generator set is electrically connected with a power frequency power grid through a main transformer and a first power grid main switch; the main generator set is electrically connected with the energy storage transformer, the energy storage transformer is electrically connected with the first electric energy converter through the second switch, the first electric energy converter is electrically connected with the first switch, and the first switch is electrically connected with the energy storage device.
Further, the main generator set at least comprises one or more of a gas generator and a coal generator set.
Further, the first switch and the second switch at least comprise one or more of a circuit breaker and a contactor.
Further, the energy storage device at least comprises one or more of a compressed air energy storage device, a flywheel energy storage device, an electrochemical energy storage device, an electromagnetic energy storage device and a thermal energy storage device.
Further, the electrochemical energy storage device at least comprises one or more of a lead-acid battery, a redox flow battery, a sodium-sulfur battery and a lithium ion battery.
Further, the electromagnetic energy storage device at least comprises one or more of superconducting electromagnetic energy storage and capacitor energy storage.
Further, the heat energy storage device at least comprises one or more of molten salt heat energy storage and heat conduction oil heat energy storage.
Further, the first power converter includes at least one or more of a rectifier and an inverter.
Further, the capacity of the energy storage transformer is not less than the capacity of the first electric energy converter.
Furthermore, the energy storage devices are one or more, that is, one or more output ends of the energy storage devices connected in parallel, and are connected with the first electric energy converter through the first switch.
Compared with the prior art, the utility model provides an auxiliary frequency modulation's system framework is simple, control method response is sensitive, quick, high-efficient, can improve thermal power factory primary control, AGC's regulation performance and energy utilization efficiency. Furthermore, the utility model provides a system of supplementary frequency modulation, scalability is strong, is applicable to the connected mode of multiunit, multinode.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a schematic diagram of an auxiliary frequency modulation device of a thermal power plant based on an energy storage device according to a preferred embodiment of the present invention;
fig. 2 is a schematic diagram of an auxiliary frequency modulation apparatus of a thermal power plant based on an energy storage device according to another preferred embodiment of the present invention applied to multiple units.
Description of reference numerals:
SE 1-energy storage device, 3-first electric energy converter, 301-first switch, 302-second switch, 4-energy storage transformer, 5-main generator set, 6-main transformer, 7-industrial frequency power grid, 701-first power grid main switch;
102-third switch, 41-first energy storage transformer, 42-second energy storage transformer, 51-first main generator set, 61-first main transformer, 71-first power frequency grid, 52-second main generator set, 62-second main transformer, 72-second power frequency grid, 702-second grid main switch, 8-second electric energy converter, 801-fourth switch, 802-fifth switch and B1-bus.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly understood and appreciated by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments, and the scope of the invention is not limited to the embodiments described herein.
Example 1
Fig. 1 is a schematic diagram of an auxiliary frequency modulation apparatus of a thermal power plant based on an energy storage device according to the present invention, which includes a main generator set 5, a first power converter 3, a first switch 301, a second switch 302, and an energy storage device SE 1; the main generator set 5 is electrically connected to the first power converter 3 through the energy storage transformer 4 and the second switch 702, and the first switch 301 is electrically connected to the first power converter 3 and the energy storage device SE 1.
The main generator set 5 is connected with a power frequency grid 7 through a main transformer 6. A first grid main switch 701 is arranged between the main transformer 6 and the power grid 7.
An energy storage transformer 4 is arranged between the first electric energy converter 3 and the terminal of the main generator set 5, namely, one side of the energy storage transformer 4 is connected with the terminal of the main generator set 5, and the other side is connected with the first electric energy converter 3 through a second switch 302. The capacity of the energy storage transformer 4 is not less than the capacity of the first power converter 3.
The main generator set 5 at least comprises one or more of a gas generator and a coal generator set.
The first switch 301 and the second switch 302 are one or more of at least a circuit breaker and a contactor.
The energy storage device SE1 at least comprises one or more of a compressed air energy storage device, a flywheel energy storage device, an electrochemical energy storage device, an electromagnetic energy storage device and a thermal energy storage device.
The electrochemical energy storage device at least comprises one or more of a lead-acid battery, a redox flow battery, a sodium-sulfur battery and a lithium ion battery. The electromagnetic energy storage device at least comprises one or more of superconducting electromagnetic energy storage and capacitor energy storage.
The thermal energy storage device at least comprises one or more of molten salt thermal energy storage and heat conduction oil thermal energy storage.
In this embodiment, the power converter is the first power converter 3.
In this embodiment, a first switch 301 is provided to connect the first power converter 3 and the energy storage device SE1, and a second switch 302 is provided to connect the first power converter 3 and the energy storage transformer 4.
When the system shown in fig. 1 performs the auxiliary frequency modulation, for example, the main generator set 5 sends a frequency modulation command, and the first electric energy converter 3 charges or discharges the energy storage device SE1 by controlling the power of the transmitted electric energy and/or the flow direction of the transmitted electric energy, so as to assist the main generator set 5 in performing the frequency modulation.
Further, the energy storage device SE1 increases the discharge power or decreases the charge power when a frequency modulation command is issued that the main generator set 5 needs to increase the output power.
Further, the energy storage device SE1 increases the charging power or decreases the discharging power when a frequency modulation command is issued that the main generator set 5 needs to decrease the output power.
In particular, the first and second (c) substrates,
1) when the first electric energy converter 3 works in a standby state, if an auxiliary frequency modulation instruction sent by the main generator set 5 when the output power of the main generator set 5 needs to be increased is received, the first electric energy converter 3 is switched to work in a state of transmitting electric energy to the energy storage transformer 4 by the first switch 301, and the first electric energy converter 3 increases the electric energy transmitted to the energy storage transformer 4; at this point, energy storage device SE1 releases energy;
when the first electric energy converter 3 works in a state that the first switch 301 transmits electric energy to the energy storage transformer 4, if an auxiliary frequency modulation command sent by the main generator set 5 when the output power of the main generator set 5 needs to be increased is received, the first electric energy converter 3 increases the electric energy transmitted to the energy storage transformer 4, and at the moment, the energy storage device SE1 releases energy;
when the first electric energy converter 3 works in a state that the energy storage transformer 4 transmits electric energy to the first switch 301, if an auxiliary frequency modulation command sent by the main generator set 5 when the output power of the main generator set 5 needs to be increased is received, the first electric energy converter 3 reduces the electric energy transmitted to the first switch 301, and at the moment, the energy storage device SE1 reduces the absorbed energy; or the first power converter 3 is controlled to work in a state of delivering power to the energy storage transformer 4 by the first switch 301, the first power converter 3 increases the power delivered to the energy storage transformer 4, and at this time, the energy storage device SE1 releases energy.
2) When the first electric energy converter 3 works in a standby state, if an auxiliary frequency modulation instruction sent by the main generator set 5 when the main generator set 5 needs to reduce the output power of the main generator set 5 is received at the time, the first electric energy converter 3 is switched to a state of working in a state of transmitting electric energy to the first switch 301 by the energy storage transformer 4, and the first electric energy converter 3 increases the electric energy transmitted to the first switch 301; at this time, the energy storage device SE1 absorbs energy;
when the first electric energy converter 3 works in a state that the first switch 301 transmits electric energy to the energy storage transformer 4, if an auxiliary frequency modulation command sent by the main generator set 5 when the output power of the main generator set 5 needs to be reduced is received, the first electric energy converter 3 reduces the electric energy transmitted to the energy storage transformer 4, and at the moment, the energy storage device SE1 reduces the release energy; or controlling the first power converter 3 to work in a state that the energy storage transformer 4 supplies power to the first switch 301, and the first power converter 3 increases the power supplied to the first switch 301, at this time, the energy storage device SE1 absorbs energy;
when the first power converter 3 is in a state of transmitting power from the energy storage transformer 4 to the first switch 301, if an auxiliary frequency modulation command is received from the main generator set 5 when the main generator set 5 needs to reduce the output power of the main generator set 5, the first power converter 3 increases the power transmitted to the first switch 301, and at this time, the energy storage device SE1 absorbs energy.
The utility model discloses the action number of times and the frequency modulation degree of depth of main generating set frequency modulation have been reduced to the frequency modulation system and the control method of device, can enough improve thermal power factory primary control, AGC's regulation performance, can improve energy utilization efficiency again.
Example 2
The utility model discloses device scalability is strong, and the operation mode is nimble, is applicable to the scene of multiunit, multinode.
Fig. 2 shows that the utility model discloses a supplementary frequency modulation device of thermal power plant is applied to schematic diagram of multiunit based on energy storage equipment, including first main generating set 51, second main generating set 52, first main transformer 61, second main transformer 62, first electric wire netting main switch 701, second electric wire netting main switch 702, first power frequency electric wire netting 71, second power frequency electric wire netting 72, first energy storage transformer 41, second energy storage transformer 42, and first electric energy converter 3, second electric energy converter 8, first switch 301, second switch 302, third switch 102, fourth switch 801, fifth switch 802, energy storage SE1 and generating line B1.
Fig. 2 shows that the energy storage device SE1 is shared in a multi-unit operation mode, which can reduce equipment investment, save construction area and improve equipment utilization rate. The energy storage devices SE1 are connected in parallel singly or in multiple, and are hung on the bus B1 together. In order to satisfy different input quantities of the energy storage devices, one or more third switches 102 are optionally provided; one end of the third switch 102 is connected with the bus B1, and the other end is connected with the energy storage device SE 1.
The main generator sets 51 and 52 at least comprise one or more of a gas generator and a coal generator set.
The first switch 301, the second switch 302, the third switch 102, the fourth switch 801 and the fifth switch 802 at least comprise one or more of a breaker and a contactor.
The energy storage device SE1 at least comprises one or more of a compressed air energy storage device, a flywheel energy storage device, an electrochemical energy storage device, an electromagnetic energy storage device and a thermal energy storage device.
The electrochemical energy storage device at least comprises one or more of a lead-acid battery, a redox flow battery, a sodium-sulfur battery and a lithium ion battery. The electromagnetic energy storage device at least comprises one or more of superconducting electromagnetic energy storage and capacitor energy storage.
The thermal energy storage device at least comprises one or more of molten salt thermal energy storage and heat conduction oil thermal energy storage.
For a multi-unit and multi-node system, the control method is similar to the control method principle of a single-unit system, but the control mode of a plurality of electric energy converters can be more flexible, and the response can be quicker. Specifically, when receiving a command requesting the first main generator set 51 and/or the second main generator set 52 to perform frequency modulation, the first power converter 3 and/or the second power converter 8 charges or discharges the energy storage device 1 by controlling the power of the transmitted power and/or the flow direction of the transmitted power, so as to assist the main generator set in performing the frequency modulation.
Specifically, the method comprises the following steps:
1) when an auxiliary frequency modulation command which is sent out when the first main generator set 51 or the second main generator set 52 needs to increase the output power of the corresponding main generator set is received, the first electric energy converter 3 increases the electric energy transmitted to the first energy storage transformer 41, or the second electric energy converter 8 increases the electric energy transmitted to the second energy storage transformer 42, and at the moment, the energy storage device SE1 releases energy; alternatively, the first power converter 3 reduces the power supplied to the first switch 301, or the second power converter 8 reduces the power supplied to the fourth switch 801, and at this time, the energy storage device SE1 reduces the absorbed energy;
when an auxiliary frequency modulation command which is sent by the first main generator set 51 or the second main generator set 52 and needs to reduce the output power of the corresponding main generator set is received, the first electric energy converter 3 increases the electric energy transmitted to the first switch 301, or the second electric energy converter 8 increases the electric energy transmitted to the fourth switch 801, and at the moment, the energy storage device SE1 absorbs energy; alternatively, the first power converter 3 reduces the power supplied to the first energy storage transformer 41, or the second power converter 8 reduces the power supplied to the second energy storage transformer 42; at this time, the energy storage device SE1 reduces the release energy.
2) When receiving an auxiliary frequency modulation command sent by the first main generator set 51 and the second main generator set 52 when the output power of the main generator sets needs to be increased, the first electric energy converter 3 and the second electric energy converter 8 respectively increase the electric energy transmitted to the first energy storage transformer 41 and the second energy storage transformer 42, and at the moment, the energy storage device SE1 releases energy; or the first power converter 3 and the second power converter 8 reduce the power supplied to the corresponding first switch 301 and fourth switch 801, at this time, the energy storage device SE1 reduces the absorbed energy;
when receiving an auxiliary frequency modulation command sent by the first main generator set 51 and the second main generator set 52 when the output power of the main generator sets needs to be reduced, the first electric energy converter 3 and the second electric energy converter 8 respectively reduce the electric energy transmitted to the first energy storage transformer 41 and the second energy storage transformer 42, and at the moment, the energy storage device SE1 reduces the release energy; or the first power converter 3 and the second power converter 8, increase the power supplied to the corresponding first switch 301 and fourth switch 801, at which time the energy storage device SE1 absorbs energy.
3) When receiving an auxiliary frequency modulation command sent by the first main generator set 51 when the output power of the first main generator set 51 needs to be increased and an auxiliary frequency modulation command sent by the second main generator set 52 when the output power of the second main generator set 52 needs to be reduced, the first electric energy converter 3 increases the electric energy transmitted to the first energy storage transformer 41, and the second electric energy converter 8 decreases the electric energy transmitted to the second energy storage transformer 42; if the power variation of the first electric energy converter 3 is larger than that of the second electric energy converter 8, the energy storage device SE1 releases energy relatively, and on the contrary, the energy storage device SE1 absorbs energy relatively;
when an auxiliary frequency modulation command which is sent by the second main generator set 52 and needs to increase the output power of the second main generator set 52 and an auxiliary frequency modulation command which is sent by the first main generator set 51 and needs to decrease the output power of the first main generator set 51 are received, the second electric energy converter 8 increases the electric energy transmitted to the second energy storage transformer 42, the first electric energy converter 3 decreases the electric energy transmitted to the first energy storage transformer 41, and if the power variation of the first electric energy converter 3 is larger than that of the second electric energy converter 8, the energy storage device 35se 25 relatively absorbs energy; conversely, the energy storage SE1 releases energy relatively.
It should be noted that the embodiment shown in fig. 2 is a system diagram of two main banks, two auxiliary frequency modulation of the power converters. The corresponding system architecture and control method can be extended to have multiple main banks, multiple power converters, and multiple energy storage devices.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the teachings of this invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. An auxiliary frequency modulation device of a thermal power plant based on energy storage equipment is characterized by comprising a main generator set, a main transformer, a first power grid main switch, a power frequency power grid, a first electric energy converter, a first switch, a second switch, an energy storage device and an energy storage transformer; the main generator set is electrically connected with the power frequency power grid through the main transformer and the first power grid main switch; the main generator set is electrically connected with the energy storage transformer, the energy storage transformer is electrically connected with the first electric energy converter through a second switch, the first electric energy converter is electrically connected with the first switch, and the first switch is electrically connected with the energy storage device.
2. The auxiliary frequency modulation device of the thermal power plant based on the energy storage equipment as claimed in claim 1, wherein the main generator set at least comprises one or more of a gas generator and a coal generator set.
3. The auxiliary frequency modulation device of a thermal power plant based on energy storage equipment as claimed in claim 1, wherein said first switch and said second switch comprise at least one or more of a circuit breaker and a contactor.
4. An energy storage device based auxiliary frequency modulation apparatus for a thermal power plant as claimed in claim 1, wherein said energy storage device comprises at least one or more of compressed air energy storage device, flywheel energy storage device, electrochemical energy storage device, electromagnetic energy storage device and thermal energy storage device.
5. The auxiliary frequency modulation device of a thermal power plant based on energy storage equipment as claimed in claim 4, wherein the electrochemical energy storage device comprises at least one or more of lead-acid battery, redox flow battery, sodium-sulfur battery, and lithium-ion battery.
6. An auxiliary frequency modulation device of a thermal power plant based on energy storage equipment as claimed in claim 4, characterized in that the electromagnetic energy storage device comprises at least one or more of superconducting electromagnetic energy storage and capacitor energy storage.
7. The auxiliary frequency modulation device of the thermal power plant based on the energy storage equipment as claimed in claim 4, wherein the thermal energy storage device at least comprises one or more of molten salt thermal energy storage and heat conduction oil thermal energy storage.
8. The auxiliary frequency modulation device of a thermal power plant based on energy storage equipment as claimed in claim 1, wherein said first power converter comprises at least one or more of a rectifier and an inverter.
9. The auxiliary frequency modulation device of a thermal power plant based on an energy storage device according to claim 1, wherein the capacity of the energy storage transformer is not less than the capacity of the first electric energy converter.
10. An auxiliary frequency modulation device of a thermal power plant based on energy storage equipment as claimed in claim 1, characterized in that the energy storage device is one or more, i.e. one or a plurality of output terminals of the energy storage device after being connected in parallel, and is connected with the first electric energy conversion device through the first switch.
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