CN110943482A - Thermal power plant frequency modulation auxiliary device based on double electric energy converters and control method - Google Patents
Thermal power plant frequency modulation auxiliary device based on double electric energy converters and control method Download PDFInfo
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- CN110943482A CN110943482A CN201911275653.XA CN201911275653A CN110943482A CN 110943482 A CN110943482 A CN 110943482A CN 201911275653 A CN201911275653 A CN 201911275653A CN 110943482 A CN110943482 A CN 110943482A
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- 238000010248 power generation Methods 0.000 abstract description 14
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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Abstract
The invention discloses a thermal power plant frequency modulation auxiliary device based on double electric energy converters, and relates to the technical field of thermal power generation. The first electric energy converter and the second electric energy converter control electric energy to flow between the electric systems at different connection ends, and the magnitude of the transmitted electric energy and the flow direction of the transmitted electric energy can be respectively and independently controlled. Meanwhile, the invention also discloses a thermal power plant frequency modulation auxiliary control method based on the double electric energy converters. The invention is sensitive, fast and efficient, can further improve the energy-saving level, and improves the regulation performance and the energy utilization efficiency of the primary frequency modulation and the automatic power generation control of the thermal power plant.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a thermal power plant frequency modulation auxiliary device based on double electric energy converters and a control method.
Background
In order to reduce cost, save energy and reduce emission, a thermal power plant actively excavates internal potential, reduces plant power consumption rate by thousands of square meters and improves the economy of the power plant. The construction of plant generator sets to supply power to plant loads or other equipment is an energy-saving technology which is implemented at present.
The steam inlet regulating valve of the plant generator set has certain throttling loss in operation, and the reasons mainly come from the following aspects: the design margin of the steam source of the plant generator set, the adjustment of the operation mode, the operation safety consideration or the requirement of the adjustment margin enable the steam inlet adjusting valve of the plant generator set to be in a throttling state frequently.
The grid-connected thermal power plant provides auxiliary services according to the relevant regulations, including frequency modulation services such as primary frequency modulation and automatic power generation control.
The primary frequency modulation refers to an automatic control process that once 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 frequency of the power grid and enables the frequency of the power grid 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.
The automatic power generation control means that the power generation unit 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 service of the power system frequency and tie line power control requirements. The assessment indexes of the automatic power generation control generally include response time, regulation rate, regulation precision and the like.
The primary frequency modulation and automatic power generation control 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 and can reach tens of seconds generally, 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 a sensitive, fast and efficient device and control method for assisting frequency modulation of a thermal power plant based on an energy-saving technology, so as to reduce throttling loss of a plant generator set, further improve energy-saving effect, simultaneously improve performance and evaluation indexes of primary frequency modulation and automatic power generation control of the thermal power plant, reduce energy loss and improve energy utilization efficiency.
Disclosure of Invention
In view of the above defects in the prior art, the technical problem to be solved by the present invention is to reduce the throttling loss of the plant generator set and further improve the energy saving effect, and the problems that the response speed or the regulation speed of frequency modulation by using a thermodynamic system is slow, the energy conversion and the utilization efficiency are relatively low, and the like are based on the energy saving technology of the plant generator set and the primary frequency modulation and automatic power generation control.
In order to achieve the above object, the present invention provides a thermal power plant frequency modulation auxiliary device based on dual electric energy converters, comprising: the system comprises a plant power generator, a plant steam turbine, a main steam turbine generator set, a main transformer, a first electric energy converter and a second electric energy converter;
the plant generator is electrically connected with the first bus; the plant steam turbine drives the plant generator to generate electricity;
the main steam turbine generator unit is electrically connected with a first power frequency power grid through the main transformer and the main switch in sequence;
the common end of the main steam turbine generator set and the main transformer is electrically connected with the first bus through the first electric energy converter;
the first bus is electrically connected with a second bus through the second electric energy converter, and the second bus is electrically connected with a second power frequency power grid;
the first power converter and the second power converter respectively or simultaneously control the size and/or the flow direction of the transmitted electric energy.
Furthermore, an admission regulating valve is arranged on the plant steam turbine and used for controlling the admission amount of the plant steam turbine.
Furthermore, power distribution devices connected or disconnected by control circuits are arranged between the first electric energy converter and the common ends of the main steam turbine generator set and the main transformer, between the first electric energy converter and the first bus, between the plant steam turbine and the first bus, between the second electric energy converter and the second bus, and between the second power frequency grid and the second bus.
Further, transformers are arranged between the first electric energy converter and the common ends of the main steam turbine generator set and the main transformer, between the first electric energy converter and the first bus, between the second electric energy converter and the second bus, and between the second electric energy converter and the first bus.
Further, the service generator is a synchronous generator or a non-synchronous generator.
Further, the asynchronous generator is an asynchronous generator or a synchronous generator operated in a variable frequency mode.
Further, the first power converter includes a first power converter first sub-device and a first power converter second sub-device connected in series.
Further, the common end of the first sub-device of the first power converter and the second sub-device of the first power converter is electrically connected with an energy storage device.
Further, the energy storage device is a chemical energy storage device and/or an electromagnetic energy storage device.
The invention also provides a control method of the thermal power plant frequency modulation auxiliary device based on the double electric energy converters, which comprises the following steps:
step one, improving the opening degree of a steam inlet adjusting valve to enable a plant generator to generate surplus electric energy;
step two, controlling a second electric energy converter to transmit the surplus electric energy to a second bus;
receiving an auxiliary frequency modulation instruction of a main steam turbine generator unit, and controlling the transmission power and/or the transmission direction of the first electric energy converter to assist the main steam turbine generator unit in frequency modulation;
step four, controlling energy storage equipment to store or release energy on the basis of the step three so as to assist the main steam turbine generator set in frequency modulation;
and step five, on the basis of the step four, the frequency modulation of the main steam turbine generator set is assisted by controlling the opening degree of the steam inlet regulating valve and/or controlling the transmission power and/or the transmission direction of the electric energy of the second electric energy converter.
Compared with the prior art, the invention has the following obvious substantive characteristics and obvious advantages:
(1) the opening of the steam inlet regulating valve of the plant steam turbine is increased, so that throttling loss can be reduced, and the operating efficiency of the plant steam turbine is improved;
(2) the first electric energy converter has fast response time and high energy conversion and utilization efficiency, can reduce the frequency, time or depth of primary frequency modulation or automatic power generation control of the main steam turbine generator set, and reduce the fluctuation of a thermodynamic system of the main steam turbine generator set and energy loss caused by the fluctuation;
(3) the first electric energy converter, the energy storage equipment and the steam inlet regulating valve are jointly controlled, so that the performances of primary frequency modulation, regulating depth or regulating range of automatic power generation control and the like can be improved;
(4) the adjusting precision is high, namely the response dead zone or the adjusting dead zone is small, and the adjusting device can sensitively respond to the received auxiliary frequency modulation command.
Therefore, the invention is sensitive, quick and efficient, can reduce the throttling loss of the plant steam turbine, improves the primary frequency modulation and automatic power generation control regulation performance of the unit, improves the thermal performance of the main steam turbine generator set, and improves the energy-saving effect and the energy utilization efficiency.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic diagram of a preferred embodiment of the present invention.
Wherein 1-a plant generator, 101-a first power distribution device, 2-a plant turbine, 201-a steam inlet regulating valve, 3-a first power converter, 31-a first power converter first sub-device, 32-a first power converter second sub-device, 301-a second power distribution device, 302-a third power distribution device, 41-a first transformer, 42-a second transformer, 43-a third transformer, 44-a fourth transformer, 5-a main turbine generator set, 6-a main transformer, 71-a first power frequency grid, 701-a main switch, 72-a second power frequency grid, 702-a fourth power distribution device, 8-a second power converter, 801-a fifth power distribution device, 802-a sixth power distribution device, 9-a load, 901-a seventh power distribution device, 10-a first bus, 11-a second bus, 12-an energy storage device.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood 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 set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
The first embodiment is as follows:
a device for assisting frequency modulation of a thermal power plant based on an energy-saving technology comprises a plant generator 1, wherein the plant generator 1 is electrically connected with a first bus 10 through a first power distribution device 101 which is connected or disconnected through a control circuit, the first bus 10 is electrically connected with a load 9 through a seventh power distribution device 901 which is connected or disconnected through the control circuit, and a plant turbine 2 which drives the plant generator 1 to generate power controls a steam inlet adjusting valve 201 of the plant turbine 2; the system also comprises a main turbo generator unit 5 and a main transformer 6, wherein the main transformer 6 is electrically connected with a first power frequency power grid 71 through a main switch 701; the system also comprises a first electric energy converter 3 and a second electric energy converter 8, wherein the first electric energy converter 3 is electrically connected with the first bus 10 through a first transformer 41 and a second distribution device 301 which is connected or disconnected by a control circuit in sequence, the first electric energy converter 3 is electrically connected with the common end of the main steam turbine generator set 5 and the main transformer 6 through a third distribution device 302 which is connected or disconnected by a control circuit in sequence, a second transformer 42 and a second transformer 43 in sequence, the fifth power distribution device 801 connected or disconnected by the control circuit is electrically connected to the first bus bar 10, the second power converter 8 is electrically connected to the second bus bar 11 through the fourth transformer 44 and the sixth power distribution device 802 connected or disconnected by the control circuit in sequence, and the second bus bar 11 is electrically connected to the second power grid 72 through the fourth power distribution device 702 connected or disconnected by the control circuit. The first power converter 3 and the second power converter 8 control the flow of electric power between the electric systems at different connection ends.
The first power converter 3 and the second power converter 8 can control the magnitude of the transmitted power and/or the flow direction of the transmitted power, respectively, and can also control the magnitude of the transmitted power and/or the flow direction of the transmitted power, respectively.
The frequency modulation of the auxiliary main steam turbine generator unit 5 comprises the step of carrying out primary frequency modulation or automatic power generation control on the auxiliary main steam turbine generator unit 5.
The control method of the embodiment comprises the following steps:
in the first step, the opening degree of the steam inlet adjusting valve 201 is increased, and the surplus electric energy generated by the increase of the opening degree of the steam inlet adjusting valve 201 on the first bus 10 from the plant generator 1 is supplied to the second bus 11 through the second electric energy converter 8 by adjusting the transmission power of the second electric energy converter 8.
And secondly, controlling the first electric energy converter 3 to assist the main steam turbine generator set 5 in frequency modulation.
1. When the first electric energy converter 3 works in a standby state, after receiving an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the main steam turbine generator set 5 needs to increase the output power of the main steam turbine generator set 5, the first electric energy converter 3 is switched to work: entering a state where the second power distribution device 301 connected or disconnected by the control circuit supplies power to the second transformer 42, the first power converter 3 increases the power supplied to the second transformer 42;
2. when the first electric energy converter 3 is in a state that the second distribution device 301 connected or disconnected by the control circuit transmits electric energy to the second transformer 42, after receiving an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the main steam turbine generator set 5 needs to increase the output power of the main steam turbine generator set 5, the first electric energy converter 3 increases the power transmitted to the second transformer 42;
3. when the first power converter 3 is in a state where the second transformer 42 supplies power to the second power distribution device 301 connected to or disconnected from the control circuit, after receiving an auxiliary frequency modulation command issued by the main steam turbine generator set 5 requiring an increase in the output power of the main steam turbine generator set 5, the first power converter 3 reduces the power supplied to the second power distribution device 301 connected to or disconnected from the control circuit, or controls the direction of the supplied power of the first power converter 3: the state in which the second power distribution device 301, connected or disconnected by the control circuit, delivers power to the second transformer 42, increases the power delivered by the first power converter 3 to the second transformer 42.
4. The first electric energy converter 3 is in a standby state, and after receiving an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the main steam turbine generator set 5 needs to reduce the output power of the main steam turbine generator set 5, the first electric energy converter 3 is switched to a working state: a state in which the second power distribution device 301 whose control circuit is connected or disconnected is supplied with power from the second transformer 42, the power supplied from the first power converter 3 to the second power distribution device 301 whose control circuit is connected or disconnected is increased;
5. when the first electric energy converter 3 is in a state that the second distribution device 301 connected or disconnected by the control circuit transmits electric energy to the second transformer 42, after receiving an auxiliary frequency modulation command sent by the main steam turbine generator set 5 needing to reduce the output power of the main steam turbine generator set 5, the first electric energy converter 3 reduces the power transmitted to the second transformer 42, or controls the first electric energy converter 3 to be in a state that the second transformer 42 transmits electric energy to the second distribution device 301 connected or disconnected by the control circuit, and increases the power transmitted by the first electric energy converter 3 to the second distribution device 301 connected or disconnected by the control circuit;
6. when the first power converter 3 is in a state where the second transformer 42 supplies power to the second power distribution device 301 to which the control circuit is connected or disconnected, the first power converter 3 increases power to be supplied to the second power distribution device 301 to which the control circuit is connected or disconnected, after receiving an auxiliary frequency modulation command from the main turbine generator set 5 that needs to reduce the output power of the main turbine generator set 5.
Example two:
the present embodiment is different from the first embodiment in that:
as shown in fig. 1, the first power converter 3 is composed of a first power converter first sub-assembly 31 and a first power converter second sub-assembly 32, and the energy storage device 12 is electrically connected between the first power converter first sub-assembly 31 and the first power converter second sub-assembly 32.
The energy storage device 12 may be a chemical energy storage device: such as lead-acid batteries, redox flow batteries, sodium sulfur batteries, lithium ion batteries, and/or electromagnetic energy storage devices: and may be an electromagnetic energy storage such as a superconducting electromagnetic energy storage device, a super capacitor energy storage device, or the like.
In the second step of the control method, the main turbo generator set 5 may be assisted in frequency modulation by simultaneously controlling the energy storage device 12 to store or release the stored energy and the first power converter first sub-device 31 and the first power converter second sub-device 32.
1. The first electric energy converter 3 works in a standby state, after receiving an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the main steam turbine generator set 5 needs to increase the output power of the main steam turbine generator set 5, the first electric energy converter 3 is switched to a state of working in a state that the second distribution device 301 connected or disconnected by the control circuit transmits electric energy to the second transformer 42, the first electric energy converter 3 increases the power transmitted to the second transformer 42, and the energy storage device 12 releases energy;
2. the first electric energy converter 3 works in a state that the second distribution device 301 connected or disconnected by the control circuit transmits electric energy to the second transformer 42, and after receiving an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the output power of the main steam turbine generator set 5 needs to be increased, the first electric energy converter 3 increases the power transmitted to the second transformer 42, and the energy storage device 12 releases energy;
3. after receiving an auxiliary frequency modulation command sent by the main steam turbine generator set 5 requiring an increase in the output power of the main steam turbine generator set 5, the first power converter 3 reduces the power supplied to the second power distribution device 301 to which the control circuit is connected or disconnected and releases the energy from the energy storage device 12, or controls the first power converter 3 to be in a state in which the second power distribution device 301 to which the control circuit is connected or disconnected supplies the electric energy to the second transformer 42, and the first power converter 3 increases the power supplied to the second transformer 42 and releases the energy from the energy storage device 12.
4. The first electric energy converter 3 is in a standby state, after receiving an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the main steam turbine generator set 5 needs to reduce the output power of the main steam turbine generator set 5, the first electric energy converter 3 is switched to a state of transmitting electric energy to the second power distribution device 301 connected or disconnected with the control circuit through the second transformer 42, the first electric energy converter 3 increases the power transmitted to the second power distribution device 301 connected or disconnected with the control circuit, and the energy storage device 12 absorbs energy;
5. when the first electric energy converter 3 is in a state that the second distribution device 301 connected or disconnected by the control circuit transmits electric energy to the second transformer 42, and receives an auxiliary frequency modulation command sent by the main steam turbine generator set 5 when the main steam turbine generator set 5 needs to reduce the output power of the main steam turbine generator set 5, the first electric energy converter 3 reduces the power transmitted to the second transformer 42 and the energy storage device 12 absorbs energy, or controls the first electric energy converter 3 to work in a state that the second transformer 42 transmits electric energy to the second distribution device 301 connected or disconnected by the control circuit, and the first electric energy converter 3 increases the power transmitted to the second distribution device 301 connected or disconnected by the control circuit and the energy storage device 12 absorbs energy;
6. the first power converter 3 is in a state where the second transformer 42 supplies power to the second power distribution device 301 connected to or disconnected from the control circuit, and when an auxiliary frequency modulation command is issued by the main turbine generator set 5 to reduce the output power of the main turbine generator set 5, the first power converter 3 increases the power supplied to the second power distribution device 301 connected to or disconnected from the control circuit, and the energy storage device 12 absorbs energy.
EXAMPLE III
The present embodiment is different from the first embodiment in that:
in the second step of the control method, the opening degree of the steam inlet adjusting valve 201 can be controlled simultaneously to assist the main steam turbine generator set 5 in performing frequency modulation.
1. The first electric energy converter 3 is in a standby state, after receiving an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the main steam turbine generator set 5 needs to increase the output power of the main steam turbine generator set 5, the first electric energy converter 3 is switched to a state that the second power distribution device 301 connected or disconnected by the control circuit transmits electric energy to the second transformer 42, and the first electric energy converter 3 increases the power transmitted to the second transformer 42 and increases the opening degree of the steam inlet adjusting valve 201;
2. the first electric energy converter 3 is in a state that the second power distribution device 301 connected or disconnected by the control circuit transmits electric energy to the second transformer 42, and after receiving an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the output power of the main steam turbine generator set 5 needs to be increased, the first electric energy converter 3 increases the power transmitted to the second transformer 42 and increases the opening degree of the steam inlet adjusting valve 201;
3. after receiving an auxiliary frequency modulation command sent by the main steam turbine generator set 5 requiring an increase in the output power of the main steam turbine generator set 5, the first power converter 3 reduces the power supplied to the second power distribution device 301 to which the control circuit is connected or disconnected and increases the opening degree of the steam intake adjusting valve 201, or controls the first power converter 3 to operate in a state in which the second power distribution device 301 to which the control circuit is connected or disconnected supplies power to the second transformer 42, and the first power converter 3 increases the power supplied to the second transformer 42 and increases the opening degree of the steam intake adjusting valve 201.
4. The first electric energy converter 3 is in a standby state, after receiving an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the main steam turbine generator set 5 needs to reduce the output power of the main steam turbine generator set 5, the first electric energy converter 3 is switched to a state that the second transformer 42 transmits electric energy to the second power distribution device 301 connected or disconnected with the control circuit, the first electric energy converter 3 increases the power transmitted to the second power distribution device 301 connected or disconnected with the control circuit, and the opening degree of the steam inlet adjusting valve 201 is reduced;
5. after receiving an auxiliary frequency modulation command sent by the main steam turbine generator set 5 when the main steam turbine generator set 5 needs to reduce the output power of the main steam turbine generator set 5, the first electric energy converter 3 reduces the power transmitted to the second transformer 42 and reduces the opening degree of the steam admission adjusting valve 201, or controls the first electric energy converter 3 to work in a state that the second transformer 42 transmits the electric energy to the second distribution device 301 connected or disconnected with the control circuit, and the first electric energy converter 3 increases the power transmitted to the second distribution device 301 connected or disconnected with the control circuit and reduces the opening degree of the steam admission adjusting valve 201;
6. the first power converter 3 is in a state where the second transformer 42 supplies power to the second power distribution device 301 to which the control circuit is connected or disconnected, and after receiving an auxiliary frequency modulation command issued by the main steam turbine generator set 5 in order to reduce the output power of the main steam turbine generator set 5, the first power converter 3 increases the power supplied to the second power distribution device 301 to which the control circuit is connected or disconnected, and decreases the opening degree of the steam intake adjusting valve 201.
Example four
The present embodiment is different from the first embodiment in that:
in the second step of the control method, the second power converter 8 may be controlled simultaneously to assist the main steam turbine generator set 5 in frequency modulation.
1. The first electric energy converter 3 is in a standby state, after receiving an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the main steam turbine generator set 5 needs to increase the output power of the main steam turbine generator set 5, the first electric energy converter 3 is switched to a state that the second distribution device 301 connected or disconnected by the control circuit transmits electric energy to the second transformer 42, the electric energy transmitted from the first electric energy converter 3 to the second transformer 42 is increased, and meanwhile, the power transmitted from the second electric energy converter 8 to the second bus 11 is reduced;
2. the first electric energy converter 3 is in a state that the second distribution device 301 connected or disconnected by the control circuit transmits electric energy to the second transformer 42, and after receiving an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the output power of the main steam turbine generator set 5 needs to be increased, the electric energy transmitted by the first electric energy converter 3 to the second transformer 42 is increased, and meanwhile, the power transmitted by the second electric energy converter 8 to the second bus 11 is reduced;
3. after receiving an auxiliary frequency modulation command sent by the main steam turbine generator set 5 requiring an increase in the output power of the main steam turbine generator set 5, the first power converter 3 reduces the power transmitted to the second power distribution device 301 to which the control circuit is connected or disconnected, the second power converter 8 reduces the power transmitted to the second bus 11, or controls the first power converter 3 to operate in a state in which the second power distribution device 301 to which the control circuit is connected or disconnected transmits power to the second transformer 42, the first power converter 3 increases the power transmitted to the second transformer 42, and the second power converter 8 reduces the power transmitted to the second bus 11.
4. The first electric energy converter 3 is in a standby state, after receiving an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the output power of the main steam turbine generator set 5 needs to be reduced, the first electric energy converter 3 is switched to a state of transmitting electric energy to the second power distribution device 301 connected or disconnected with the control circuit through the second transformer 42, the first electric energy converter 3 increases the electric energy transmitted to the second power distribution device 301 connected or disconnected with the control circuit, and the second electric energy converter 8 increases the power transmitted to the second bus 11;
5. after receiving an auxiliary frequency modulation command sent by the main steam turbine generator set 5 requiring to reduce the output power of the main steam turbine generator set 5, the first electric energy converter 3 reduces the electric energy transmitted to the second transformer 42, the second electric energy converter 8 increases the power energy transmitted to the second bus 11, or the first electric energy converter 3 is controlled to be in a state in which the second transformer 42 transmits the electric energy to the second distribution device 301 connected or disconnected with the control circuit, the first electric energy converter 3 increases the electric energy transmitted to the second distribution device 301 connected or disconnected with the control circuit, and the second electric energy converter 8 increases the power transmitted to the second bus 11;
6. the first power converter 3 operates in a state where the second transformer 42 supplies power to the second power distribution device 301 connected to or disconnected from the control circuit, and after receiving an auxiliary frequency modulation command from the main turbine generator set 5 to reduce the output power of the main turbine generator set 5, the first power converter 3 increases the power supplied to the second power distribution device 301 connected to or disconnected from the control circuit, and the second power converter 8 increases the power supplied to the second bus 11.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A thermal power plant frequency modulation auxiliary device based on double electric energy converters is characterized by comprising: the system comprises a plant power generator, a plant steam turbine, a main steam turbine generator set, a main transformer, a first electric energy converter and a second electric energy converter;
the plant generator is electrically connected with the first bus; the plant steam turbine drives the plant generator to generate electricity;
the main steam turbine generator unit is electrically connected with a first power frequency power grid through the main transformer and the main switch in sequence;
the common end of the main steam turbine generator set and the main transformer is electrically connected with the first bus through the first electric energy converter;
the first bus is electrically connected with a second bus through the second electric energy converter, and the second bus is electrically connected with a second power frequency power grid;
the first power converter and the second power converter respectively or simultaneously control the size and/or the flow direction of the transmitted electric energy.
2. A frequency modulation auxiliary device for a thermal power plant as claimed in claim 1 wherein said plant turbine is provided with a steam admission regulating valve for controlling the steam admission of said plant turbine.
3. A frequency modulation auxiliary device for a thermal power plant as claimed in claim 1, wherein a power distribution device for controlling circuit connection or disconnection is disposed between the first power converter and the common terminal of the main steam turbine generator set and the main transformer, between the first power converter and the first bus, between the plant steam turbine and the first bus, between the second power converter and the second bus, and between the second power grid and the second bus.
4. A thermal power plant frequency modulation auxiliary device as claimed in claim 1, wherein transformers are provided between the first power converter and the common terminals of the main turbine generator set and the main transformer, between the first power converter and the first bus, between the second power converter and the second bus, and between the second power converter and the first bus.
5. A thermal power plant frequency modulation auxiliary apparatus as claimed in claim 1, wherein said plant generator is either a synchronous generator or a non-synchronous generator.
6. A frequency modulation auxiliary device for a thermal power plant as claimed in claim 5 wherein said non-synchronous generator is an asynchronous generator or a synchronous generator operated at variable frequency.
7. A thermal power plant frequency modulation auxiliary device as claimed in claim 1, wherein said first power converter comprises a first power converter first sub-device and a first power converter second sub-device connected in series.
8. A thermal power plant frequency modulation auxiliary device as claimed in claim 7, wherein a common terminal of said first power converter first sub-device and said first power converter second sub-device is electrically connected to an energy storage device.
9. A frequency modulation auxiliary apparatus for a thermal power plant as claimed in claim 8 wherein said energy storage device is a chemical energy storage device and/or an electromagnetic energy storage device.
10. A control method of a thermal power plant frequency modulation auxiliary device based on double electric energy converters is characterized by comprising the following steps:
step one, improving the opening degree of a steam inlet adjusting valve to enable a plant generator to generate surplus electric energy;
step two, controlling a second electric energy converter to transmit the surplus electric energy to a second bus;
receiving an auxiliary frequency modulation instruction of a main steam turbine generator unit, and controlling the transmission power and/or the transmission direction of the first electric energy converter to assist the main steam turbine generator unit in frequency modulation;
step four, controlling energy storage equipment to store or release energy on the basis of the step three so as to assist the main steam turbine generator set in frequency modulation;
and step five, on the basis of the step four, the frequency modulation of the main steam turbine generator set is assisted by controlling the opening degree of the steam inlet regulating valve and/or controlling the transmission power and/or the transmission direction of the electric energy of the second electric energy converter.
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