Adjacent thermal power plant feed pump power supply system and method

Abstract

The invention discloses an adjacent thermal power plant feed pump power supply system and method, and relates to the technical field of feed pump power supply after one thermal power plant in adjacent thermal power plants loses power. The thermal power plant comprises a plant bus and a water feeding pump, and the plant bus is electrically connected with the water feeding pump. The inter-plant connecting line can be electrically connected with the power supply buses of the plant feed pumps of any two adjacent thermal power plants. The station service bus of the non-power-loss power plant is electrically connected with the station service bus of the power-loss power plant through an inter-station connecting line, so that the non-power-loss power plant serves as a power supply power plant to supply power to a power supply bus of a water feeding pump of the power-loss power plant. According to the technical scheme, the station service bus of the non-power-losing power plant supplies power to the water feeding pump of the power-losing power plant. The starting speed of the feed pump of the power-losing power plant after power failure is increased; and the non-power-loss power plant can permanently supply power to the water feeding pump of the power-loss power plant. Power can be supplied to the water feeding pump when a power plant loses power on the whole, the response speed is increased, the maintenance cost is reduced, and the unit safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of power supply technology for water pumps in adjacent thermal power plants after a power failure, and particularly to a power supply system and method for water pumps in adjacent thermal power plants. Background Technology

[0002] In common thermal power plants, when the entire plant loses power, the generator units cannot supply power to the boiler feedwater pumps. The feedwater pumps stop operating, making it difficult to guarantee water supply to the boilers and increasing the risk of boiler dry-burning accidents. Diesel generators or UPS power supplies are often used as backup power for the feedwater pumps. Diesel generators require 10-30 seconds to start, resulting in a high response delay, which makes it difficult to meet the timeliness requirements of boiler water shortage protection. Their capacity is also limited, making it difficult to support the continuous operation of high-pressure feedwater pumps. Furthermore, they require regular maintenance and fuel reserves, leading to high maintenance costs. UPS power supplies also have limited capacity, making it difficult to guarantee continuous power supply, and they require regular maintenance, resulting in high maintenance costs. Summary of the Invention

[0003] The main objective of this invention is to propose a power supply system and method for feedwater pumps in adjacent thermal power plants, which aims to supply power to feedwater pumps when the power plant loses power, thereby improving response speed, reducing maintenance costs, and ensuring operating time.

[0004] To achieve the above objectives, the present invention proposes a power supply system for feedwater pumps of adjacent thermal power plants, comprising at least two thermal power plants and an inter-plant connection line located between any two of the thermal power plants. The thermal power plant includes a plant busbar and a feedwater pump, and the plant busbar and the feedwater pump are electrically connected. The inter-plant interconnection line can electrically connect the plant busbars of any two adjacent thermal power plants. When at least one of the at least two thermal power plants loses power and becomes a power-out plant, at least one of the at least two thermal power plants that has not lost power acts as a power supply plant. The plant busbar of the power supply plant is electrically connected to the plant busbar of the power-out plant through the inter-plant tie line, so that the power supply plant supplies power to the feedwater pump of the power-out plant.

[0005] In one embodiment, a current detector is provided on the plant busbar; and / or, A voltage detector is installed on the plant busbar; and / or, The plant busbar is equipped with an incoming line protection device.

[0006] In one embodiment, the incoming line protection device includes an incoming line circuit breaker.

[0007] In one embodiment, a first circuit breaker is provided between the inter-plant tie line and the plant busbar, the first circuit breaker being used to control the connection and disconnection between the inter-plant tie line and the corresponding plant busbar.

[0008] In one embodiment, the plant busbar is connected to a first feeder and a second feeder, a second circuit breaker is connected between the first feeder and the plant busbar, the first feeder is electrically connected to the water supply pump, and a third circuit breaker is connected between the second feeder and the plant busbar.

[0009] This invention also proposes a method for supplying power to feedwater pumps of adjacent thermal power plants, used in the power supply system of feedwater pumps of the adjacent thermal power plants, characterized by comprising the following steps: Detect the power supply status of the station busbars of at least two of the aforementioned thermal power plants; The thermal power plant whose plant busbar is de-energized is designated as the de-energized power plant, and the thermal power plant whose plant busbar is not de-energized is designated as the power supply power plant. The plant busbar of the power plant that lost power and the plant busbar of the power supply plant are respectively connected to the inter-plant tie line so that the power supply plant supplies power to the plant busbar of the power plant that lost power. Start the feedwater pumps of the power plant that has lost power.

[0010] In one embodiment, a current detector, a voltage detector, and an incoming line protection device are provided on the plant busbar. The detection of the power supply status of the auxiliary busbars of at least two of the thermal power plants includes the following steps: The voltage and incoming current of the plant service bus of the thermal power plant are detected, and the operation signal of the incoming protection device of the thermal power plant is detected. When the voltage and incoming current of the auxiliary busbar of the thermal power plant are both zero, and the incoming protection device of the thermal power plant has no activation signal, the corresponding auxiliary busbar of the thermal power plant loses power.

[0011] In one embodiment, the incoming line protection device includes an incoming line circuit breaker; Before connecting the power plant's auxiliary busbar to the power plant that has lost power and the power plant's auxiliary busbar to the inter-plant tie line, the following steps are also included: Extended booking time period; When the plant busbar is not powered, the incoming circuit breaker of the plant busbar of the power plant that is de-energized shall be placed in the open state.

[0012] In one embodiment, the plant busbar is connected to a first feeder and a second feeder, a second circuit breaker is connected between the first feeder and the plant busbar, the first feeder is electrically connected to the water supply pump, and a third circuit breaker is connected between the second feeder and the plant busbar. After placing the incoming circuit breaker of the power plant's auxiliary busbar in the open state, the method further includes the following steps: Set the second circuit breaker of the power plant that has lost power to the ON state; The third circuit breaker of the power plant that lost power was placed in the open state.

[0013] In one embodiment, a first circuit breaker is provided between the inter-plant tie line and the plant busbar, and the first circuit breaker is used to control the connection and disconnection between the inter-plant tie line and the corresponding plant busbar. The step of connecting the power plant's auxiliary busbar to the power plant that has lost power and the power plant's auxiliary busbar to the inter-plant tie line includes the following steps: The first circuit breaker between the plant busbar of the power plant that lost power and the inter-plant tie line is placed in the on state; The first circuit breaker between the power plant's auxiliary busbar and the common interconnector is placed in the ON state.

[0014] In the technical solution of this invention, after the power supply busbar of the thermal power plant loses power, the corresponding thermal power plant becomes a power-depleted plant, and the power supply to the feedwater pumps of the power-depleted plant stops, thus stopping the water supply from the feedwater pumps of the power-depleted plant. By electrically connecting the power supply busbar of the power supply plant and the power supply busbar of the power-depleted plant through the inter-plant interconnection line, the power supply busbar of the power supply plant can supply power to the power supply busbar of the power-depleted plant, so that the power supply busbar of the power supply plant can supply power to the feedwater pumps of the power-depleted plant. When the power plant's auxiliary busbar fails to supply power to the feedwater pumps, the system can quickly connect the auxiliary busbars of the power supply plant and the power plant that failed to supply power, thereby rapidly supplying power to the feedwater pumps and improving their restart speed after a power outage. The power supply plant can continuously supply power to the feedwater pumps of the power plant that failed to supply power. No UPS power supply or diesel engine is required. Overall, the system can supply power to the feedwater pumps during a power plant outage, improving response speed, reducing maintenance costs, ensuring uptime, and guaranteeing unit safety. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of a structural embodiment of a power supply system for feedwater pumps in an adjacent thermal power plant provided by the present invention; Figure 2 This is a flowchart illustrating an embodiment of the power supply method for feedwater pumps in adjacent thermal power plants provided by the present invention.

[0017] Explanation of icon numbers: 1. Thermal power plant; 11. Plant busbar; 111. Voltage detector; 112. Current detector; 113. Incoming line protection device; 12. Feed water pump; 13. First feeder; 131. Second circuit breaker; 14. Second feeder; 141. Third circuit breaker; 15. Generator; 2. Inter-plant tie line; 3. Power plant experiencing power failure; 4. Power supply plant; 5. First circuit breaker.

[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0022] In common thermal power plants, when the entire plant loses power, the generator units cannot supply power to the boiler feedwater pumps. The feedwater pumps stop operating, making it difficult to guarantee water supply to the boilers and increasing the risk of boiler dry-burning accidents. Diesel generators or UPS power supplies are often used as backup power for the feedwater pumps. Diesel generators require 10-30 seconds to start, resulting in a high response delay, which makes it difficult to meet the timeliness requirements of boiler water shortage protection. Their capacity is also limited, making it difficult to support the continuous operation of high-pressure feedwater pumps. Furthermore, they require regular maintenance and fuel reserves, leading to high maintenance costs. UPS power supplies also have limited capacity, making it difficult to guarantee continuous power supply, and they require regular maintenance, resulting in high maintenance costs.

[0023] This invention proposes a power supply system for feedwater pumps in adjacent thermal power plants.

[0024] Please see Figure 1 In one embodiment of the present invention, the power supply system for the feedwater pumps of adjacent thermal power plants includes at least two thermal power plants 1 and a connecting line. Each thermal power plant 1 includes a plant busbar 11 and a feedwater pump 12, which are electrically connected. The inter-plant connecting line 2 can electrically connect the plant busbars 11 of any two adjacent thermal power plants 1. When at least one of the at least two thermal power plants 1 loses power and becomes a de-energized power plant 3, at least one of the at least two thermal power plants 1 that is not de-energized acts as a power supply plant 4. The plant busbar 11 of the power supply plant 4 is electrically connected to the plant busbar 11 of the de-energized power plant 3 via the inter-plant connecting line 2, so that the power supply plant 4 supplies power to the feedwater pump 12 of the de-energized power plant 3.

[0025] In the technical solution of this invention, after the power plant busbar 11 of the thermal power plant 1 loses power, the corresponding thermal power plant 1 becomes a power-depleted power plant 3, and the power supply to the feedwater pump 12 of the power-depleted power plant 3 stops, thus stopping the water supply of the feedwater pump 12 of the power-depleted power plant 3. By electrically connecting the power plant busbar 11 of the power supply plant 4 with the power plant busbar 11 of the power-depleted power plant 3 through the inter-plant connecting line 2, the power plant busbar 11 of the power supply plant 4 can supply power to the power plant busbar 11 of the power-depleted power plant 3, so that the power plant busbar 11 of the power supply plant 4 can supply power to the feedwater pump 12 of the power-depleted power plant 3. When the power supply bus 11 of the de-energized power plant 3 fails to supply power to the feedwater pump 12, the system can quickly connect the power supply bus 11 of the power supply plant 4 to the power supply bus 11 of the de-energized power plant 3 to rapidly supply power to the feedwater pump 12 of the de-energized power plant 3, thereby improving the startup speed of the feedwater pump 12 after power failure. The power supply plant 4 can continuously supply power to the feedwater pump 12 of the de-energized power plant 3. No UPS power supply or diesel engine is required. Overall, the system can supply power to the feedwater pump 12 when the power plant fails, improving response speed, reducing maintenance costs, ensuring operating time, and guaranteeing unit safety.

[0026] The thermal power plant 1 can be an oil-fired power plant, a coal-fired power plant, or a gas-fired power plant, and is not limited thereto. The thermal power plant 1 also includes a boiler and a generator 15. The generator 15 is connected to the plant's auxiliary busbar 11 via an incoming circuit breaker, allowing the generator 15 to supply power to the plant's auxiliary busbar. The feedwater pump 12 is connected to the boiler. When the auxiliary busbar 11 of the thermal power plant 1 is not de-energized, the auxiliary busbar 11 can supply power to the feedwater pump 12. When the feedwater pump 12 is running, it can supply water to the boiler to prevent the boiler from drying out due to water shortage.

[0027] The at least two thermal power plants 1 include two, three or more thermal power plants 1, and the power plant 3 that loses power can be one, two or more; the power supply plant 4 can be one, two or more. Specifically, the at least two power plants are multi-phase power plants built adjacent to each other, the at least two thermal power plants 1 include two thermal power plants 1, and the power plant 3 that loses power and the power supply plant 4 are both one.

[0028] The rated voltage of both the plant busbar 11 and the inter-plant connecting line 2 is 6.6kV, which enables the plant busbar 11 and the inter-plant connecting line 2 to be directly electrically connected, facilitating the direct electrical connection of the inter-plant connecting line 2 to the plant busbar 11 between the two thermal power plants 1.

[0029] Please see Figure 1The plant bus 11 is equipped with a current detector 112. The current detector 112 can detect the incoming current of the plant bus 11 in real time. When the incoming current of the plant bus 11 is zero, the plant bus 11 is easily in a de-energized state. When the plant bus 11 is de-energized, the current detector 112 returns to zero, so as to quickly detect the power supply status of the plant bus 11.

[0030] A voltage detector 111 is installed on the plant bus 11. By setting the voltage detector 111, the voltage of the plant bus 11 can be detected in real time; when the plant bus 11 loses power, the voltage detector 111 returns to zero, which can quickly detect the power supply status of the plant bus 11.

[0031] The plant busbar 11 is equipped with an incoming line protection device 113. The incoming line protection device 113 can detect the status of the plant busbar 11, so that external short circuit faults can be eliminated when the incoming line protection device 113 does not operate.

[0032] The plant busbar 11 is equipped with a current detector 112; a voltage detector 111; and an incoming line protection device 113. When the voltage on the plant busbar 11 is zero, the current on the plant busbar 11 is zero. By detecting the operation of the incoming line protection device 113, and when the incoming line protection device 113 fails to operate, external faults can be eliminated, thus confirming that the plant busbar 11 is de-energized.

[0033] The incoming line protection device 113 includes an incoming line circuit breaker. When the power supply plant 4 supplies power to the busbar of the power-depleted power plant 3, it can disconnect the incoming line circuit breaker of the power-depleted power plant 3 to prevent the power-depleted power plant 3 from directly supplying power to the plant service busbar 11 of the power-depleted power plant 3 when the power-depleted power plant 3 is out of power-depleted state.

[0034] Please see Figure 1 A first circuit breaker 5 is provided between the inter-plant connecting line 2 and the plant service bus 11. The first circuit breaker 5 is used to control the connection and disconnection between the inter-plant connecting line 2 and the corresponding plant service bus 11. When the thermal power plant 1 is not de-energized, the electrical connection between the plant service bus 11 and the inter-plant connecting line 2 can be disconnected by setting the first circuit breaker 5 to open. When the thermal power plant 1 becomes a de-energized power plant 3 or a power supply power plant 4, the electrical connection between the plant service bus 11 and the inter-plant connecting line 2 can be restored by setting the first circuit breaker 5 to close.

[0035] The plant busbar 11 is connected to a first feeder 13 and a second feeder 14. A second circuit breaker 131 connects the first feeder 13 to the plant busbar 11. The first feeder 13 is electrically connected to the water supply pump 12. A third circuit breaker 141 connects the second feeder 14 to the plant busbar 11. When the power supply plant 4 supplies power to the plant busbar 11 of the de-energized power plant 3, the load on the plant busbar 11 of the power supply plant 4 is reduced by placing the third circuit breaker 141 of the plant busbar 11 of the de-energized power plant 3 in the open state. Multiple second feeders 14 are spaced along the plant busbar 11, each corresponding to a different electrical appliance; no specific limitation is made here.

[0036] The power supply system for the feedwater pumps of the adjacent thermal power plant also includes a control system. The control system is electrically connected to the current detector 112, the voltage detector 111, the incoming line protection device 113, the first circuit breaker 5, and the second circuit breaker 131. The control system can control and automatically switch the operating states of the current detector 112, the voltage detector 111, the incoming line protection device 113, the first circuit breaker 5, and the second circuit breaker 131.

[0037] Please see Figure 2 This invention also proposes a method for supplying power to feedwater pumps of adjacent thermal power plants. This method includes a power supply system for the feedwater pumps of adjacent thermal power plants. The specific structure of this power supply system is as described in the above embodiments. Since this method for supplying power to feedwater pumps of adjacent thermal power plants adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here. The method includes the following steps: Detect the power supply status of the plant service bus 11 of at least two of the thermal power plants 1; The thermal power plant 1 with the plant busbar 11 de-energized is designated as the de-energized power plant 3, and the thermal power plant 1 with the plant busbar 11 not de-energized is designated as the power supply power plant 4. The plant busbar 11 of the power plant 3 that has lost power and the plant busbar 11 of the power supply plant 4 are respectively connected to the inter-plant tie line 2, so that the power supply plant 4 supplies power to the plant busbar 11 of the power plant 3 that has lost power. Start the water supply pump 12 of the power plant 3 that has lost power.

[0038] By constantly monitoring the power supply status of the plant bus 11 of the thermal power plant 1, it is possible to set the corresponding plant bus 11 of the thermal power plant 1 to the de-energized power plant 3 when the plant bus 11 of the thermal power plant 1 loses power, and set the thermal power plant 1 with the plant bus 11 not losing power as the power supply power plant 4.

[0039] The plant busbar 11 is equipped with a current detector 112, a voltage detector 111, and an incoming line protection device 113. The detection of the power supply status of the auxiliary busbars 11 of at least two of the thermal power plants 1 includes the following steps: The voltage and incoming current of the plant busbar 11 of the thermal power plant 1 are detected, and the operation signal of the incoming protection device 113 of the thermal power plant 1 is detected. When the voltage and incoming current of the auxiliary bus 11 of the thermal power plant 1 are both zero, and the incoming protection device 113 of the thermal power plant 1 has no action signal, the corresponding auxiliary bus 11 of the thermal power plant 1 loses power.

[0040] By real-time monitoring of the voltage and incoming current of the plant bus 11 and the action signal of the incoming protection device 113, the power failure of the plant bus 11 can be detected at the moment of power failure.

[0041] The incoming line protection device 113 includes an incoming line circuit breaker; Before connecting the power plant busbar 11 of the de-energized power plant 3 and the power plant busbar 11 of the power supply power plant 4 to the inter-plant tie line 2, the following steps are also included: Extended booking time period; When the power supply to the plant busbar 11 is not restored, the incoming circuit breaker of the plant busbar 11 of the power-destroyed power plant 3 is placed in the open state.

[0042] After a predetermined delay period, when power is restored to the auxiliary bus 11 of the de-energized power plant 3, the thermal power plant 1 can supply power to its own auxiliary bus 11 to eliminate short-term extreme operating conditions of the auxiliary bus 11, such as zero incoming voltage and current. If power is not restored to the auxiliary bus 11 during the predetermined delay period, the connection between the generator 15 of the thermal power plant 1 and the auxiliary bus 11 is disconnected. The predetermined delay period can be set as needed; specifically, it is 0.5 seconds.

[0043] The plant busbar 11 is connected to a first feeder 13 and a second feeder 14. A second circuit breaker 131 is connected between the first feeder 13 and the plant busbar 11. The first feeder 13 is electrically connected to the water supply pump 12. A third circuit breaker 141 is connected between the second feeder 14 and the plant busbar 11. After placing the incoming circuit breaker of the plant service bus 11 of the de-energized power plant 3 in the open state, the method further includes the following steps: Set the second circuit breaker 131 of the power plant 3 that has lost power to the ON state; The third circuit breaker 141 of the power plant 3 that has lost power is placed in the open state.

[0044] This allows the power plant 4 to supply power to the feedwater pump 12 of the de-energized power plant 3 while simultaneously disconnecting other loads on the plant busbar 11 of the de-energized power plant 3. This ensures the power supply to the feedwater pump 12 of the de-energized power plant 3 and reduces the load pressure on the plant busbar 11 of the power plant 4, thereby guaranteeing the power supply to the plant busbar 11 of the power plant 4.

[0045] A first circuit breaker 5 is provided between the inter-plant connecting line 2 and the plant bus 11. The first circuit breaker 5 is used to control the connection and disconnection between the inter-plant connecting line 2 and the corresponding plant bus 11. The step of connecting the power plant busbar 11 of the de-energized power plant 3 and the power plant busbar 11 of the power supply power plant 4 to the inter-plant tie line 2 includes the following steps: The first circuit breaker 5 between the plant busbar 11 of the power plant 3 and the inter-plant connection line 2 is placed in the on state; The first circuit breaker 5 between the plant busbar 11 of the power supply plant 4 and the common interconnector is put into the on state.

[0046] The connection between the power plant busbar 11 of the power plant 3 that lost power and the power plant busbar 11 of the power supply plant 4 was realized.

[0047] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A power supply system for feed water pumps of adjacent thermal power plants, characterized in that, The power plant comprises at least two thermal power plants and an inter-plant tie line arranged between any two of the thermal power plants; The thermal power plant comprises a plant bus and a feed water pump, and the plant bus and the feed water pump are electrically connected; The inter-plant tie line can electrically connect the plant buses of any two adjacent thermal power plants; When at least one of the at least two thermal power plants loses power to become a power-losing power plant, at least one of the at least two thermal power plants that has not lost power becomes a power-supplying power plant, and the plant bus of the power-supplying power plant is electrically connected to the plant bus of the power-losing power plant through the inter-plant tie line, so that the power-supplying power plant supplies power to the feed water pump of the power-losing power plant.

2. The adjacent thermal power plant feed water pump power supply system as claimed in claim 1, wherein, The plant bus is provided with a current detector; and / or The plant bus is provided with a voltage detector; and / or The plant bus is provided with an incoming line protection device.

3. The adjacent thermal power plant feed water pump power supply system as claimed in claim 2, wherein, The incoming line protection device comprises an incoming line circuit breaker.

4. The adjacent thermal power plant feed water pump power supply system as claimed in claim 1, wherein, A first circuit breaker is arranged between the inter-plant tie line and the plant bus, and is used to control the on-off of the inter-plant tie line and the corresponding plant bus.

5. The adjacent thermal power plant feed water pump power supply system as claimed in claim 1, wherein, The plant bus is connected to a first feeder and a second feeder, a second circuit breaker is arranged between the first feeder and the plant bus, the first feeder is electrically connected to the feed water pump, and a third circuit breaker is arranged between the second feeder and the plant bus.

6. A method for supplying power to a feedwater pump of a neighboring thermal power plant, for the power supply system to the feedwater pump of the neighboring thermal power plant according to any one of claims 1 to 5, characterized by, The method comprises the following steps: Detecting the power supply state of the plant bus of the at least two thermal power plants; Taking the thermal power plant whose plant bus loses power as a power-losing power plant, and taking the thermal power plant whose plant bus has not lost power as a power-supplying power plant; Connecting the plant bus of the power-losing power plant and the plant bus of the power-supplying power plant to the inter-plant tie line, so that the power-supplying power plant supplies power to the plant bus of the power-losing power plant; Starting the feed water pump of the power-losing power plant.

7. The method of claim 6, wherein the adjacent thermal power plant feed water pump power supply method is characterized by, The plant bus is provided with a current detector, the plant bus is provided with a voltage detector, and the plant bus is provided with an incoming line protection device; The step of detecting the power supply state of the plant bus of the at least two thermal power plants comprises the following steps: Detecting the voltage and incoming line current of the plant bus of the thermal power plant, and detecting the action signal of the incoming line protection device of the thermal power plant; When the voltage and incoming line current of the plant bus of the thermal power plant are both zero, and the incoming line protection device of the thermal power plant has no action signal, the plant bus of the corresponding thermal power plant loses power.

8. The method of claim 7, wherein the adjacent thermal power plant feed water pump power supply method is characterized by, The incoming line protection device comprises an incoming line circuit breaker; Before the step of connecting the plant bus of the power-losing power plant and the plant bus of the power-supplying power plant to the inter-plant tie line, the method further comprises the following steps: Delaying for a predetermined period of time; When the plant bus has not recovered power supply, setting the incoming line circuit breaker of the plant bus of the power-losing power plant to an open state.

9. The method of claim 8, wherein the adjacent thermal power plant feed water pump power supply method is characterized by, The plant bus is connected to a first feeder and a second feeder, a second circuit breaker is arranged between the first feeder and the plant bus, the first feeder is electrically connected to the feed water pump, and a third circuit breaker is arranged between the second feeder and the plant bus; The step of connecting the plant bus of the power-off power plant and the plant bus of the power-supplying power plant to the inter-plant tie line further comprises the steps of: placing a second circuit breaker of the power-off power plant in an on state; placing a third circuit breaker of the power-off power plant in an off state.

10. The method of claim 6, wherein the adjacent thermal power plant feed water pump power supply method is characterized by, A first circuit breaker is arranged between the inter-plant tie line and the plant bus, and is used to control the on-off between the inter-plant tie line and the corresponding plant bus. The step of connecting the plant bus of the power-off power plant and the plant bus of the power-supplying power plant to the inter-plant tie line further comprises the steps of: placing a first circuit breaker between the plant bus of the power-off power plant and the inter-plant tie line in an on state; placing a first circuit breaker between the plant bus of the power-supplying power plant and the common tie-in device in an on state.

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