Power generation control method and device of generator set and generator set

Abstract

The embodiment of the invention provides a power generation control method and device of a power generator set and the power generator set. The method comprises the steps that the current main steam pressure of a steam turbine, the current valve position of a high-pressure adjusting valve and the current power generation load and target power generation load of the power generator set are obtained; according to the current main steam pressure, the current valve position, the current power generation load and the target power generation load, the valve position of the adjusting valve group is adjusted so as to adjust the feed water flow in a high water adding side pipeline, and therefore the steam extraction amount of a first-stage high-pressure heater, a second-stage high-pressure heater and a third-stage high-pressure heater is adjusted, and the amount of water steam doing work in a steam turbine is adjusted; the on-load capacity of the generator set is adjusted, so that the power generation load of the generator set can reach the target power generation load when the set is in high back pressure, the actual power generation load of the set can reach the target power generation load when the set is in high back pressure, and the safety of a power grid is ensured. And the unit can meet the load requirements of a power grid side load instruction and unit capacity spot check when the back pressure is high, so that the economic loss is avoided.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of generator sets, and in particular, to a method and device for controlling power generation of a generator set, and a generator set. Background Art

[0002] At present, the ambient temperature of domestic large-scale air-cooled (including: direct air-cooled or indirect air-cooled) generator sets during design is all based on the local average temperature throughout the year. In this way, when the ambient temperature is high in summer, the cooling capacity of the condenser decreases, resulting in a higher back pressure on the generator set. When the back pressure is higher than the set back pressure value, the generator set's power generation capacity will decrease, making it difficult for the generator set to reach the rated load value designed for the unit. Summary of the invention

[0003] The embodiments of the present application provide a power generation control method, device and generator set of an air-cooled generator set, which enable the power generation load of the generator set to reach a target power generation load when the back pressure is higher than a certain back pressure.

[0004] In a first aspect, an embodiment of the present application provides a power generation control method for a generator set, wherein the generator set comprises: the generator set comprises: a water supply end, a high-pressure water supply side pipeline, a regulating pipeline, a boiler primary heating end, a boiler secondary heating end, a steam turbine and a deaerator, the deaerator is connected to the water supply end, the steam turbine comprises a high-pressure cylinder, an intermediate-pressure cylinder and a high-pressure regulating valve, the middle part of the high-pressure cylinder is connected to a first-level high-pressure heater, the tail part of the high-pressure cylinder is connected to a second-level high-pressure heater, the middle part of the intermediate-pressure cylinder is connected to a third-level high-pressure heater, the boiler primary heating end is connected between the first-level high-pressure heater and the high-pressure cylinder, and the boiler secondary heating end is connected to the high The pressure cylinder and the medium pressure cylinder, the high pressure water side pipeline and the regulating pipeline are connected in parallel between the water supply end and the primary heating end of the boiler, the first high pressure heater and the second high pressure heater are connected with a first high pressure drain pipeline, the second high pressure heater and the third high pressure heater are connected with a second high pressure drain pipeline, the third high pressure heater and the deaerator are connected with a third high pressure drain pipeline, the first high pressure heater, the second high pressure heater and the third high pressure heater are also connected in series in sequence on the high pressure water side pipeline, a regulating valve group is arranged on the regulating pipeline, and the high pressure regulating valve is located between the primary heating end of the boiler and the high pressure cylinder;

[0005] The method comprises:

[0006] Acquire the current main steam pressure of the steam turbine, the current valve position of the high-pressure regulating valve, and the current power generation load and target power generation load of the generator set;

[0007] According to the current main steam pressure, the current valve position of the high-pressure regulating valve, the current power generation load and the target power generation load, the valve position of the regulating valve group is adjusted so that the power generation load of the generator set reaches the target power generation load.

[0008] Optionally, adjusting the valve position of the regulating valve group according to the current main steam pressure, the current valve position of the high-pressure regulating valve, the current power generation load and the target power generation load includes:

[0009] Determine whether the current main steam pressure is the preset main steam pressure, whether the current valve position of the high-pressure regulating valve is the fully open valve position, and whether the current power generation load does not reach the target power generation load;

[0010] If both are yes, control the regulating valve group to open, so that part of the feed water provided by the water supply end passes through the regulating pipeline, reducing the feed water flow entering the high-pressure water supply side pipeline, and the total feed water flow provided by the water supply end to the primary heating end of the boiler remains unchanged;

[0011] Otherwise, the regulating valve group is controlled not to open.

[0012] Optionally, the preset main steam pressure is the rated main steam pressure of the steam turbine, and the target power generation load is any one of the following: the rated power generation load of the generator set, the power generation load required by the power grid side, and the power generation load reported by the generator set to the power grid side, wherein the power generation load required by the power grid side and the power generation load reported by the generator set to the power grid side are both less than or equal to the rated power generation load.

[0013] Optionally, after controlling the regulating valve group to open, the method further includes:

[0014] Adjust the valve position of the high pressure regulating valve.

[0015] Optionally, controlling the regulating valve group to open includes:

[0016] Controlling the regulating valve group to open to a first target valve position;

[0017] The adjusting the valve position of the high pressure regulating valve comprises:

[0018] adjusting the valve position of the high-pressure regulating valve to a second target valve position;

[0019] Wherein, when the regulating valve group is located at the first target valve position, the current valve position is the second target valve position, and the second target valve position is the valve position corresponding to the generator set having the target frequency regulation capability.

[0020] Optionally, the regulating valve group includes: a regulating valve and a switch valve, and the regulating valve and the switch valve are connected in series;

[0021] The controlling the regulating valve group to open to the first target valve position comprises:

[0022] The switch valve is controlled to open, and the regulating valve is controlled to open to the first target valve position.

[0023] In a second aspect, an embodiment of the present application provides a generator set, including: a deaerator, a water supply end, a high-pressure water supply side pipeline, a regulating pipeline, a boiler primary heating end, a boiler secondary heating end, a steam turbine and a power generation control device, wherein the deaerator is connected to the water supply end, the steam turbine includes a high-pressure cylinder, a medium-pressure cylinder and a high-pressure regulating valve, the middle part of the high-pressure cylinder is connected to a first-level high-pressure heater, the tail part of the high-pressure cylinder is connected to a second-level high-pressure heater, the middle part of the medium-pressure cylinder is connected to a third-level high-pressure heater, the boiler primary heating end is connected between the first-level high-pressure heater and the high-pressure cylinder, and the boiler secondary heating end is connected between the high-pressure cylinder and the medium-pressure cylinder. , the high pressure water side pipeline and the regulating pipeline are connected in parallel between the water supply end and the primary heating end of the boiler, a first-level high pressure heater drain pipeline is connected between the first-level high pressure heater and the second-level high pressure heater, a second-level high pressure heater drain pipeline is connected between the second-level high pressure heater and the third-level high pressure heater, a third-level high pressure heater drain pipeline is connected between the third-level high pressure heater and the deaerator, the first-level high pressure heater, the second-level high pressure heater, and the third-level high pressure heater are also connected in series on the high pressure water side pipeline in sequence, a regulating valve group is arranged on the regulating pipeline, and the high pressure regulating valve is located between the primary heating end of the boiler and the high pressure cylinder;

[0024] The power generation control device is used to execute the method described in any one of the first aspects.

[0025] Optionally, the regulating valve group includes: a regulating valve and a switch valve, and the regulating valve and the switch valve are connected in series.

[0026] In a third aspect, an embodiment of the present application provides a power generation control device for a generator set, comprising: an acquisition module and a regulation module;

[0027] An acquisition module, used for acquiring the current main steam pressure of the steam turbine, the current valve position of the high-pressure regulating valve, the current power generation load and the target power generation load of the generator set;

[0028] The regulating module is used to adjust the valve position of the regulating valve group according to the current main steam pressure, the current valve position of the high-pressure regulating valve and the current power generation load, so that the power generation load of the generator set reaches the target power generation load.

[0029] Optionally, when the regulating module adjusts the valve position of the regulating valve group according to the current main steam pressure, the current valve position of the high-pressure regulating valve, the current power generation load and the target power generation load, it is specifically used to:

[0030] Determine whether the current main steam pressure is the preset main steam pressure, whether the current valve position of the high-pressure regulating valve is the fully open valve position, and whether the current power generation load has not reached the target power generation load;

[0031] If both are yes, control the regulating valve group to open, so that part of the feed water provided by the feed water end passes through the regulating pipeline, reducing the feed water flow entering the high-pressure water supply side pipeline, and the total feed water flow provided by the feed water end to the primary heating end of the boiler remains unchanged;

[0032] Otherwise, the control regulating valve group will not open.

[0033] Optionally, the preset main steam pressure is the rated main steam pressure of the steam turbine, and the target power generation load is any one of the following: the rated power generation load of the generator set, the power generation load required by the power grid side, and the power generation load reported by the generator set to the power grid side, wherein the power generation load required by the power grid side and the power generation load reported by the generator set to the power grid side are both less than or equal to the rated power generation load.

[0034] Optionally, after the regulating module controls the regulating valve group to open, it is also used to:

[0035] Adjust the valve position of the high pressure regulating valve.

[0036] Optionally, when the regulating module controls the regulating valve group to open, it is specifically used to:

[0037] Controlling the regulating valve group to open to a first target valve position;

[0038] When the regulating module adjusts the valve position of the high-pressure regulating valve, it is specifically used to:

[0039] adjusting the valve position of the high-pressure regulating valve to a second target valve position;

[0040] Wherein, when the regulating valve group is located at the first target valve position, the current valve position is the second target valve position, and the second target valve position is the valve position corresponding to the generator set having the target frequency regulation capability.

[0041] Optionally, the regulating valve group includes: a regulating valve and a switch valve, and the regulating valve and the switch valve are connected in series;

[0042] When the regulating module controls the regulating valve group to open to the first target valve position, it is specifically used to:

[0043] The switch valve is controlled to open, and the regulating valve is controlled to open to the first target valve position.

[0044] In a fourth aspect, an embodiment of the present application provides an electronic device, including: a processor and a memory;

[0045] Memory stores computer-executable instructions;

[0046] The processor executes the computer-executable instructions stored in the memory, so that the processor performs any method of the first aspect.

[0047] In a fifth aspect, an embodiment of the present application provides a readable storage medium, including a program or an instruction. When the program or the instruction runs on a computer, any method of the above-mentioned first aspect is executed.

[0048] In a sixth aspect, an embodiment of the present application provides a program product, including a computer program, which, when executed by a processor, implements the method described in any one of the first aspects.

[0049] The present application provides a power generation control method, device and generator set of a generator set, by obtaining the current main steam pressure of the steam turbine, the current valve position of the high-pressure regulating valve, and the current power generation load and target power generation load of the generator set; according to the current main steam pressure, the current valve position and the current power generation load and the target power generation load, the valve position of the regulating valve group is adjusted to adjust the flow of feed water in the regulating pipeline and the high-pressure water supply side pipeline, thereby adjusting the extraction amount of the first-stage high-pressure heater, the second-stage high-pressure heater and the third-stage high-pressure heater, thereby adjusting the amount of water vapor doing work in the steam turbine, and adjusting the load carrying capacity of the generator set, so that when the back pressure is high, the power generation load of the generator set can also reach the target power generation load. In addition, the unit can meet the load instructions on the grid side and the load requirements during the unit capacity spot check when the back pressure is high. The method shown in this embodiment can make the actual power generation load of the unit at high back pressure reach the target power generation load, ensure the safety of the grid, and avoid causing economic losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0051] Figure 1 A schematic diagram of the structure of a generator set provided in one embodiment of the present application;

[0052] Figure 2 A flow chart of a power generation control method for a generator set provided in one embodiment of the present application;

[0053] Figure 3 A flow chart of a power generation control method for a generator set provided by another embodiment of the present application;

[0054] Figure 4 A schematic diagram of the structure of a power generation control device for a generator set provided in one embodiment of the present application;

[0055] Figure 5 A schematic diagram of the hardware structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0057] At present, the ambient temperature during the design of large domestic generator sets is the local average temperature throughout the year. In this way, when the ambient temperature is high in summer, the cooling capacity of the condenser decreases, causing the back pressure of the generator set to be higher than the designed back pressure. When the back pressure reaches a certain value, the power generation capacity of the generator set will decrease, making it difficult for the generator set to reach the designed rated load value of the unit.

[0058] In addition, in summer, electricity consumption is high and unevenly distributed between morning and evening. Therefore, the generator set also needs to have the function of regulating electric power so that the generator set can participate in auxiliary services such as peak load regulation and frequency regulation of the power grid. However, due to the high back pressure of the generator set, the power generation capacity is reduced. To reach the rated load value, the high-pressure regulating valve of the general air-cooled steam turbine unit will be fully opened at the rated main steam pressure. Even if the high-pressure regulating valves of the steam turbine unit are fully opened, it is difficult to reach the rated load value. At the same time, because the high-pressure regulating valves are all open, the unit loses the ability to regulate the frequency in the positive direction.

[0059] Moreover, for power plants, due to the implementation of the capacity electricity price mechanism for thermal power units in China, the size of their revenue depends on the load capacity of the generator units. If the ambient temperature in summer is too high and the load capacity of the generator units decreases, the capacity electricity price revenue of the power plants will be affected. At the same time, the power grid will spot-check the load capacity of the generator units. If the actual load capacity of the generator units does not reach more than 97.5% of the load capacity reported to the power grid for 15 consecutive minutes, the power plant may not get the capacity electricity price revenue for this month, or even cancel the capacity electricity price for this month, causing economic losses.

[0060] Therefore, in order to solve at least one of the above-mentioned technical problems, the present application proposes a power generation control method, device and generator set of a generator set, by adding a regulating pipeline between the water supply end and the boiler end, on the basis of keeping the amount of water provided to the boiler unchanged, that is, keeping the amount of steam provided by the boiler end to the steam turbine unchanged, a part of the water flows to the boiler end through the regulating pipeline, thereby reducing the amount of water in the high-pressure water supply side pipeline, that is, reducing the feed water flow rate flowing through the high-pressure heater of the generator set, thereby reducing the amount of steam extracted from the turbine by the high-pressure heater. In this way, the amount of steam in the turbine is relatively increased, and this increased part of the steam does work in the turbine, thereby increasing the load-carrying capacity of the generator set.

[0061] It should be noted that although the high-pressure heater reduces the steam extraction amount in the steam turbine, resulting in a relative increase in the amount of steam in the steam turbine, which will correspondingly increase the back pressure and reduce the load capacity of the generator set, the increase in the load capacity of the generator set brought about by the increased steam is far greater than the decrease in the load capacity caused by the increase in back pressure. Therefore, the power generation control method, device and generator set provided by the present application can achieve an increase in the load capacity of the generator set.

[0062] Figure 1 A schematic diagram of the structure of a generator set provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the generator set includes: a deaerator 100, a water supply end 110, a high-pressure water supply side pipeline 120, a regulating pipeline 130, a boiler primary heating end 141, a boiler secondary heating end 142, a steam turbine 150 and a power generation control device 160, the steam turbine includes a high-pressure cylinder 151 and a medium-pressure cylinder 152 and a high-pressure regulating valve (not shown in the figure), the middle of the high-pressure cylinder is connected with a first-level high-pressure heater 1511, the tail of the high-pressure cylinder is connected with a second-level high-pressure heater 1512, the middle of the medium-pressure cylinder is connected with a third-level high-pressure heater 1521, the boiler primary heating end 141 is connected between the first-level high-pressure heater 1511 and the high-pressure cylinder 151, the boiler secondary heating end 142 is connected between the high-pressure cylinder 151 and the medium-pressure cylinder 152, the high-pressure water supply side pipeline 120, the regulating pipeline 130 A first-stage high-pressure heater drain pipeline 121 is connected in parallel between the water supply end 110 and the primary heating end 141 of the boiler, a second-stage high-pressure heater 1511 and a second-stage high-pressure heater 1512 are connected, a second-stage high-pressure heater drain pipeline 122 is connected between the second-stage high-pressure heater 1512 and the third-stage high-pressure heater 1521, a third-stage high-pressure heater drain pipeline 123 is connected between the third-stage high-pressure heater 1521 and the deaerator 100, the first-stage high-pressure heater 1511, the second-stage high-pressure heater 1512, and the third-stage high-pressure heater 1521 are also connected in series in sequence on the high-pressure heater water side pipeline 120, a regulating valve group 170 is provided on the control pipeline 130, the high-pressure regulating valve is located between the boiler end 140 and the high-pressure cylinder 151, and the power generation control device 160 is connected to the regulating valve group 170 and the high-pressure regulating valve.

[0063] Specifically, the structures of the first-stage high-pressure heater 1511, the second-stage high-pressure heater 1512, and the third-stage high-pressure heater 1521 are described by taking the first-stage high-pressure heater 1511 as an example:

[0064] The primary high-pressure heater 1511 includes a channel for conveying feed water and a channel for conveying condensed water, and the two channels are isolated from each other.

[0065] Among them, for the high-pressure water side pipeline 120, the channels for conveying feed water in the first-stage high-pressure heater 1511, the second-stage high-pressure heater 1512, and the third-stage high-pressure heater 1521 are connected; a first-stage high-pressure heater drain pipeline 121 is formed between the first-stage high-pressure heater 1511 and the second-stage high-pressure heater 1512, a second-stage high-pressure heater drain pipeline 122 is connected between the second-stage high-pressure heater 1512 and the third-stage high-pressure heater 1521, and a third-stage high-pressure heater drain pipeline 123 is connected between the third-stage high-pressure heater 1521 and the deaerator 100. The condensed water in the first-stage high-pressure heater 1511 flows to the second-stage high-pressure heater 1512 through the first-stage high-pressure heater drain pipeline 121, the condensed water in the second-stage high-pressure heater 1512 flows to the third-stage high-pressure heater 1521 through the second-stage high-pressure heater drain pipeline 122, and the condensed water in the third-stage high-pressure heater 1521 flows to the deaerator through the third-stage high-pressure heater drain pipeline 123, thereby realizing the flow of condensed water to the deaerator.

[0066] The feed water provided by the feed water end 110 can be delivered to the boiler primary heating end 141 through the high-pressure water adding side pipeline 120 and the regulating pipeline 130. When the feed water is delivered to the boiler primary heating end 141 through the high-pressure water adding side pipeline 120, the feed water flows through the inside of the three-stage high-pressure heater 1521, the second-stage high-pressure heater 1512, and the first-stage high-pressure heater 1511 in sequence. When the feed water passes through the three-stage high-pressure heater 1521, the second-stage high-pressure heater 1512, and the first-stage high-pressure heater 1511, it will respectively extract part of the water vapor inside the intermediate pressure cylinder 152, and inside and at the tail of the high-pressure cylinder 151, and condense the water vapor into condensed water.

[0067] The condensed water in the deaerator 100 is provided to the water supply end 110 , and is mixed with other steam and water entering the deaerator 100 to be provided to the boiler primary heating end 141 again.

[0068] The water vapor generated by heating at the primary heating end 141 of the boiler is transported to the high-pressure cylinder 151 to generate power. The water vapor generated by the high-pressure cylinder 151 is heated by the secondary heating end 142 of the boiler and then transported to the medium-pressure cylinder to generate power.

[0069] When the generator set operates normally, the power generation load reaches the target power generation load, and the feed water provided by the water supply end 110 is all delivered to the boiler primary heating end 141 through the high-pressure water supply side pipeline 120; when the main steam pressure reaches the preset steam pressure, and even if the valve position of the high-pressure regulating valve is fully opened, the power generation load has not reached the target power generation load, the regulating valve group 170 is opened, and on the basis of the total feed water flow rate remaining unchanged, the feed water provided by the water supply end 110 is delivered to the boiler primary heating end 141 through the high-pressure water supply side pipeline 120 and the regulating pipeline 130, thereby reducing the feed water flow rate flowing through the high-pressure water supply side pipeline 120.

[0070] Optional, such as Figure 1 As shown, the regulating valve group 170 includes: a regulating valve 171 and a switch valve 172, and the regulating valve 171 and the switch valve 172 are connected in series. Among them, the regulating valve 171 is, for example, an electric (or pneumatic) regulating valve, and the switch valve 172 is, for example, an electric switch valve. The switch valve 172 is used to control the on-off of the regulating pipeline 130, and the regulating valve 171 is used to control the water supply flow of the regulating pipeline 130.

[0071] The specific power generation control method for controlling the power generation load of the power generation unit by the power generation control device can be referred to the following embodiments.

[0072] Figure 2 This is a flow chart of a power generation control method for a generator set provided in one embodiment of the present application. Figure 2 As shown, in Figure 1 Based on the generator set shown in FIG. 1 , the execution subject of this embodiment can be Figure 1 The power generation control device shown, the method includes:

[0073] S201. Obtain the current main steam pressure of the steam turbine, the current valve position of the high-pressure regulating valve, and the current power generation load and target power generation load of the generator set.

[0074] Specifically, the main steam pressure is the pressure of the water vapor generated by the boiler end 140 that can enter the high-pressure cylinder.

[0075] The high-pressure regulating valve is used to control the flow of water vapor entering the high-pressure cylinder. In theory, the larger the opening of the high-pressure regulating valve, the greater the flow of water vapor entering the high-pressure cylinder, that is, the more water vapor does work in the steam turbine, and the greater the load capacity of the generator set. However, generally, the high-pressure regulating valve will not be in a fully open state.

[0076] The target power generation load is the rated power generation load, that is, the power generation load when the generator set is designed, or the power generation load that can be achieved by the generator set reported by the power plant to the grid side, or the power generation load required by the grid side. Among them, the power generation load that can be achieved by the generator set reported by the power plant to the grid side and the power generation load required by the grid side are both less than or equal to the rated power generation load. The target power generation load in the embodiment of the present application is illustrated by taking the rated power generation load as an example.

[0077] The operating data of the generator set, for example, the main steam pressure and the current valve position of the high-pressure regulating valve can be collected and acquired through corresponding sensors and uploaded to the power generation control device of the generator set. For details, please refer to the existing technology and will not be repeated here.

[0078] S202. According to the current main steam pressure, the current valve position of the high-pressure regulating valve, the current power generation load and the target power generation load, the valve position of the regulating valve group is adjusted so that the power generation load of the generator set reaches the target power generation load.

[0079] Specifically, when the current power generation load has not reached the target power generation load, and the current main steam pressure and the current valve position of the high-pressure regulating valve show that the power generation load can no longer be adjusted by adjusting the main steam pressure and the valve position of the high-pressure regulating valve, the valve position of the regulating valve group can be adjusted at this time. For example, if the regulating valve group has not been opened before, the power generation control device opens the regulating valve group at this time, so that the feed water provided by the feed water end is transported to the boiler end through the high-water addition side pipeline and the regulating pipeline. If the regulating valve group was opened before, the opening of the regulating valve group is increased at this time to reduce the flow rate of feed water in the high-water addition side pipeline and increase the flow rate of feed water in the regulating pipeline, so that the water vapor doing work in the turbine increases, thereby increasing the load-carrying capacity of the generator set, so that the current power generation load reaches the target power generation load.

[0080] In this embodiment, by obtaining the current main steam pressure of the steam turbine, the current valve position of the high-pressure regulating valve, and the current power generation load and target power generation load of the generator set; according to the current main steam pressure, the current valve position, the current power generation load and the target power generation load, the valve position of the regulating valve group is adjusted to adjust the flow of feed water in the regulating pipeline and the high-pressure water supply side pipeline, thereby adjusting the steam extraction of the first-stage high-pressure heater, the second-stage high-pressure heater and the third-stage high-pressure heater, thereby adjusting the amount of water vapor doing work in the steam turbine, and adjusting the load carrying capacity of the generator set, so that when the back pressure is high, the power generation load of the generator set can also reach the target power generation load. In this way, the unit can meet the load instructions on the grid side and the load requirements during the unit capacity spot check when the back pressure is high. The method shown in this embodiment can make the actual power generation load of the unit at high back pressure reach the target power generation load, ensure the safety of the grid, and avoid economic losses.

[0081] Figure 3 This is a flow chart of a power generation control method for a generator set provided by another embodiment of the present application. Figure 3 As shown, in Figure 2 Based on the illustrated embodiment, the method includes:

[0082] S301. Obtain the current main steam pressure of the steam turbine, the current valve position of the high-pressure regulating valve, and the current power generation load and target power generation load of the generator set.

[0083] Specifically, the implementation method of S301 may refer to S201, which will not be described in detail here.

[0084] S302, determine whether the current main steam pressure is the preset main steam pressure, whether the current valve position of the high-pressure regulating valve is the fully open valve position, and whether the current power generation load has not reached the target power generation load. If all are yes, execute S303, if not, execute S304.

[0085] Specifically, the preset main steam pressure is generally the rated main steam pressure of the steam turbine, that is, the maximum steam pressure generated by the boiler end that can enter the high-pressure cylinder when the generator set is designed.

[0086] When the main steam pressure reaches the rated main steam pressure, the power generation load of the generator set cannot be adjusted by increasing the main steam pressure.

[0087] When the current valve position of the high-pressure regulating valve is the fully open valve position, it means that the power generation load of the generator set cannot be adjusted by increasing the opening of the high-pressure regulating valve.

[0088] Therefore, if the current main steam pressure is the rated main steam pressure, the current valve position of the high pressure regulating valve is the fully open valve position, and the current power generation load has not reached the rated power generation load, if the power generation load of the generator set needs to be increased, execute S303.

[0089] S303, control the regulating valve group to open, so that part of the feed water provided by the water supply end passes through the regulating pipeline, reducing the feed water flow entering the high-pressure water supply side pipeline, and the total feed water flow provided by the water supply end to the primary heating end of the boiler remains unchanged;

[0090] Specifically, when the current power generation load has not reached the rated power generation load, and the power generation load cannot be increased by adjusting the main steam pressure and the high-pressure regulating valve, the regulating valve group can be controlled to open, so that the feed water provided by the feed water end flows to the boiler end through the regulating pipeline and the high-pressure water addition side pipeline. On the basis of the unchanged amount of water provided to the boiler, that is, the unchanged amount of steam provided by the boiler end to the steam turbine, a part of the water is flowed to the boiler end through the regulating pipeline, thereby reducing the amount of water in the high-pressure water addition side pipeline, and ultimately increasing the load-carrying capacity of the generator set.

[0091] Optionally, after executing S303, the method further includes:

[0092] S305. Adjust the valve position of the high-pressure regulating valve.

[0093] Specifically, simply controlling the opening of the regulating valve group can achieve the purpose of increasing the load-carrying capacity of the generator set, but at this time, the high-pressure regulating valve is in the fully open valve position, which reduces the primary frequency regulation capacity of the steam turbine. Therefore, on the basis of controlling the opening of the regulating valve group so that the power generation load of the generator set is the rated power generation load, the valve position of the high-pressure regulating valve can also be adjusted to increase the primary frequency regulation capacity of the steam turbine, so that the generator set has the ability to regulate frequency and peak, thereby increasing the power plant's revenue in the frequency regulation market.

[0094] Among them, optionally, the specific implementation of S303 and S305 is:

[0095] S3031, controlling the regulating valve group to open to a first target valve position;

[0096] S3051. Adjust the valve position of the high-pressure regulating valve to a second target valve position.

[0097] Among them, when the regulating valve group is located at the first target valve position, the second target valve position is the valve position corresponding to the generator set having the target frequency regulation capability.

[0098] Specifically, the target frequency regulation capability refers to the ability of the generator set to meet the frequency and peak regulation requirements of the power grid.

[0099] Generally, the regulating valve group includes: a regulating valve and a switch valve, and the regulating valve and the switch valve are connected in series. After the regulating valve group is opened, that is, the switch valve and the regulating valve are both opened, the purpose of increasing the load-carrying capacity of the generator set is achieved. In order to make the generator set in a better power generation state, from an economic point of view, on the one hand, the opening of the regulating valve group can be further increased to increase the amount of steam doing work in the steam turbine and increase the power generation load. At this time, since the valve position of the switch valve cannot be controlled, the valve position of the regulating valve can be adjusted; on the other hand, the opening of the high-pressure regulating valve is reduced, so that the high-pressure regulating valve is at a suitable valve position opening, and the unit has a certain frequency regulation capability. In this way, the opening of the regulating valve and the high-pressure regulating valve is dynamically adjusted, so that when the power generation load of the generator set is the rated power generation load, the generator set has the target frequency regulation capability and maximizes the economic benefits.

[0100] S304, control the regulating valve group not to open.

[0101] Specifically, when the power generation load has not reached the preset power generation load, if the current main steam pressure is less than the rated main steam pressure, the power generation load of the generator set can be increased by increasing the main steam pressure; or, if the current valve position of the high-pressure regulating valve is not fully open and it still has the frequency regulation capability, the power generation load of the generator set can be increased by increasing the opening of the high-pressure regulating valve. At this time, the regulating valve group can be kept closed.

[0102] In this embodiment, by obtaining the current main steam pressure of the steam turbine, the current valve position of the high-pressure regulating valve, the current power generation load of the generator set, and the target power generation load, it is determined whether the current main steam pressure is the preset main steam pressure, whether the current valve position of the high-pressure regulating valve is the fully open valve position, and whether the current power generation load has not reached the target power generation load; if all are yes, the regulating valve group is controlled to open so that the feed water provided by the feed water end flows to the boiler end through the regulating pipeline and the high-pressure water addition side pipeline; otherwise, the regulating valve group is controlled not to open. The function of adjusting the flow rate of the feed water in the regulating pipeline and the high-pressure water addition side pipeline is achieved, thereby adjusting the steam extraction amount of the first high-pressure heater and the second high-pressure heater, thereby adjusting the amount of water vapor doing work in the steam turbine, and finally achieving the purpose of adjusting the load-carrying capacity of the generator set, so that the power generation load of the generator set reaches the target power generation load.

[0103] Figure 4 This is a schematic diagram of the structure of a power generation control device for a generator set provided in one embodiment of the present application. Figure 4 As shown, the device includes: an acquisition module 410 and an adjustment module 420.

[0104] The acquisition module 410 is used to acquire the current main steam pressure of the steam turbine, the current valve position of the high-pressure regulating valve, and the current power generation load and target power generation load of the generator set;

[0105] The regulating module 420 is used to adjust the valve position of the regulating valve group according to the current main steam pressure, the current valve position of the high-pressure regulating valve, the current power generation load and the target power generation load so that the current power generation load reaches the target power generation load.

[0106] Optionally, when the regulating module 420 adjusts the valve position of the regulating valve group according to the current main steam pressure, the current valve position of the high-pressure regulating valve, the current power generation load and the target power generation load, it is specifically used to:

[0107] Determine whether the current main steam pressure is the preset main steam pressure, whether the current valve position of the high-pressure regulating valve is the fully open valve position, and whether the current power generation load has not reached the target power generation load;

[0108] If both are yes, control the regulating valve group to open, so that part of the feed water provided by the feed water end passes through the regulating pipeline, reducing the feed water flow entering the high-pressure water supply side pipeline, and the total feed water flow provided by the feed water end to the primary heating end of the boiler remains unchanged;

[0109] Otherwise, the control regulating valve group will not open.

[0110] Optionally, the preset main steam pressure is the rated main steam pressure of the turbine, and the target power generation load is any one of the following: the rated power generation load of the generator set, the power generation load required by the grid side, and the power generation load reported by the generator set to the grid side, wherein the power generation load required by the grid side and the power generation load reported by the generator set to the grid side are both less than or equal to the rated power generation load.

[0111] Optionally, after the regulating module 420 controls the regulating valve group to open, it is also used to:

[0112] Adjust the valve position of the high-pressure regulating valve.

[0113] Optionally, when the regulating module 420 controls the regulating valve group to open, it is specifically used to:

[0114] Controlling the regulating valve group to open to a first target valve position;

[0115] When the regulating module 420 adjusts the valve position of the high pressure regulating valve, it is specifically used to:

[0116] Adjusting the valve position of the high-pressure regulating valve to the second target valve position;

[0117] Among them, when the regulating valve group is located at the first target valve position, the second target valve position is the valve position corresponding to the generator set having the target frequency regulation capability.

[0118] Optionally, the regulating valve group includes: a regulating valve and a switch valve, and the regulating valve and the switch valve are connected in series;

[0119] When the regulating module 420 controls the regulating valve group to open to the first target valve position, it is specifically used for:

[0120] The switch valve is controlled to open, and the regulating valve is controlled to open to the first target valve position.

[0121] The power generation control device of the generator set provided in the embodiment of the present application can execute the technical solution shown in the above method embodiment, and its implementation principle and beneficial effects are similar, which will not be repeated here.

[0122] Figure 5 The hardware structure diagram of the electronic device provided in one embodiment of the present application is shown in FIG. Figure 5 As shown, the electronic device includes: a processor 501 and a memory 502,

[0123] The processor 501 and the memory 502 are connected via a bus 503 .

[0124] In a specific implementation process, the processor 501 executes the computer execution instructions stored in the memory 502, so that the processor 501 executes the above method.

[0125] The specific implementation process of the processor 501 can be found in the above method embodiment, and its implementation principle and technical effect are similar, so this embodiment will not be repeated here.

[0126] In the above Figure 5 In the illustrated embodiment, it should be understood that the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The steps of the method disclosed in the application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0127] The memory may include high-speed RAM memory and may also include non-volatile storage NVM, such as disk storage.

[0128] The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of the present application is not limited to only one bus or one type of bus.

[0129] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above method is implemented.

[0130] The computer-readable storage medium mentioned above can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special-purpose computer.

[0131] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (Application Specific Integrated Circuits, referred to as: ASIC). Of course, the processor and the readable storage medium can also exist in the device as discrete components.

[0132] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power generation control method for a generator set, characterized in that: The generator set includes: a water supply end, a high-pressure water supply side pipeline, a control pipeline, a boiler primary heating end, a boiler secondary heating end, a steam turbine and a deaerator. The deaerator is connected to the water supply end. The steam turbine includes a high-pressure cylinder, a medium-pressure cylinder and a high-pressure regulating valve. The middle part of the high-pressure cylinder is connected to a first-level high-pressure heater, the tail part of the high-pressure cylinder is connected to a second-level high-pressure heater, and the middle part of the medium-pressure cylinder is connected to a third-level high-pressure heater. The boiler primary heating end is connected between the first-level high-pressure heater and the high-pressure cylinder, and the boiler secondary heating end is connected between the high-pressure cylinder and the medium-pressure cylinder. The high-pressure water supply side pipeline, The control pipeline is connected in parallel between the water supply end and the primary heating end of the boiler, a primary high-pressure heater drain pipeline is connected between the primary high-pressure heater and the secondary high-pressure heater, a secondary high-pressure heater drain pipeline is connected between the secondary high-pressure heater and the tertiary high-pressure heater, a tertiary high-pressure heater drain pipeline is connected between the tertiary high-pressure heater and the deaerator, the primary high-pressure heater, the secondary high-pressure heater, and the tertiary high-pressure heater are also connected in series on the high-pressure heater water side pipeline in sequence, a regulating valve group is arranged on the control pipeline, and the high-pressure regulating valve is located between the primary heating end of the boiler and the high-pressure cylinder; The method comprises: Acquire the current main steam pressure of the steam turbine, the current valve position of the high-pressure regulating valve, and the current power generation load and target power generation load of the generator set; According to the current main steam pressure, the current valve position of the high-pressure regulating valve, the current power generation load and the target power generation load, the valve position of the regulating valve group is adjusted so that the power generation load of the generator set reaches the target power generation load.

2. The method according to claim 1, characterized in that The adjusting the valve position of the regulating valve group according to the current main steam pressure, the current valve position of the high-pressure regulating valve, the current power generation load and the target power generation load includes: Determine whether the current main steam pressure is the preset main steam pressure, whether the current valve position of the high-pressure regulating valve is the fully open valve position, and whether the current power generation load does not reach the target power generation load; If both are yes, control the regulating valve group to open, so that part of the feed water provided by the water supply end passes through the regulating pipeline, reducing the feed water flow entering the high-pressure water supply side pipeline, and the total feed water flow provided by the water supply end to the primary heating end of the boiler remains unchanged; Otherwise, the regulating valve group is controlled not to open.

3. The method according to claim 2, characterized in that The preset main steam pressure is the rated main steam pressure of the steam turbine, and the target power generation load is any one of the following: the rated power generation load of the generator set, the power generation load required by the power grid, and the power generation load reported by the generator set to the power grid, wherein the power generation load required by the power grid and the power generation load reported by the generator set to the power grid are both less than or equal to the rated power generation load.

4. The method according to claim 2, characterized in that: After the control of the regulating valve group to open, the method further includes: Adjust the valve position of the high pressure regulating valve.

5. The method according to claim 4, characterized in that The controlling the regulating valve group to open includes: Controlling the regulating valve group to open to a first target valve position; The adjusting the valve position of the high pressure regulating valve comprises: adjusting the valve position of the high-pressure regulating valve to a second target valve position; Wherein, when the regulating valve group is located at the first target valve position, the second target valve position is a valve position corresponding to when the generator set has a target frequency regulation capability.

6. The method according to claim 5, characterized in that The regulating valve group comprises: a regulating valve and a switch valve, wherein the regulating valve and the switch valve are connected in series; The controlling the regulating valve group to open to the first target valve position comprises: The switch valve is controlled to open, and the regulating valve is controlled to open to the first target valve position.

7. A generator set, characterized in that: include: A deaerator, a water supply end, a high-pressure water supply side pipeline, a regulating pipeline, a boiler primary heating end, a boiler secondary heating end, a steam turbine and a power generation control device, wherein the deaerator is connected to the water supply end, the steam turbine comprises a high-pressure cylinder, a medium-pressure cylinder and a high-pressure regulating valve, the middle of the high-pressure cylinder is connected to a first-level high-pressure heater, the tail of the high-pressure cylinder is connected to a second-level high-pressure heater, the middle of the medium-pressure cylinder is connected to a third-level high-pressure heater, the boiler primary heating end is connected between the first-level high-pressure heater and the high-pressure cylinder, the boiler secondary heating end is connected between the high-pressure cylinder and the medium-pressure cylinder, the high-pressure water supply side pipeline, the The control pipeline is connected in parallel between the water supply end and the primary heating end of the boiler, a primary high-pressure heater drain pipeline is connected between the primary high-pressure heater and the secondary high-pressure heater, a secondary high-pressure heater drain pipeline is connected between the secondary high-pressure heater and the tertiary high-pressure heater, a tertiary high-pressure heater drain pipeline is connected between the tertiary high-pressure heater and the deaerator, the primary high-pressure heater, the secondary high-pressure heater, and the tertiary high-pressure heater are also connected in series on the high-pressure heater water side pipeline in sequence, a regulating valve group is arranged on the control pipeline, and the high-pressure regulating valve is located between the primary heating end of the boiler and the high-pressure cylinder; The power generation control device is used to execute the method according to any one of claims 1-6.

8. The generator set according to claim 7, characterized in that: The regulating valve group comprises: a regulating valve and a switch valve, and the regulating valve and the switch valve are connected in series.

9. A power generation control device for a generator set, characterized in that: The generator set includes: the generator set includes: a deaerator, a water supply end, a high-pressure water supply side pipeline, a control pipeline, a boiler primary heating end, a boiler secondary heating end, and a steam turbine. The deaerator is connected to the water supply end. The steam turbine includes a high-pressure cylinder, a medium-pressure cylinder and a high-pressure regulating valve. The middle part of the high-pressure cylinder is connected to a first-level high-pressure heater, the tail part of the high-pressure cylinder is connected to a second-level high-pressure heater, and the middle part of the medium-pressure cylinder is connected to a third-level high-pressure heater. The boiler primary heating end is connected between the first-level high-pressure heater and the high-pressure cylinder, the boiler secondary heating end is connected between the high-pressure cylinder and the medium-pressure cylinder, and the high-pressure water supply end is connected to the steam turbine. The side pipeline and the regulating pipeline are connected in parallel between the water supply end and the primary heating end of the boiler, a first-level high-pressure heater drain pipeline is connected between the first-level high-pressure heater and the second-level high-pressure heater, a second-level high-pressure heater drain pipeline is connected between the second-level high-pressure heater and the third-level high-pressure heater, and a third-level high-pressure heater drain pipeline is connected between the third-level high-pressure heater and the deaerator. The first-level high-pressure heater, the second-level high-pressure heater, and the third-level high-pressure heater are also connected in series on the high-pressure water side pipeline in sequence. A regulating valve group is arranged on the regulating pipeline, and the high-pressure regulating valve is located between the primary heating end of the boiler and the high-pressure cylinder; The device comprises: An acquisition module is used to acquire the current main steam pressure of the steam turbine, the current valve position of the high-pressure regulating valve, and the current power generation load and target power generation load of the generator set; The regulating module is used to adjust the valve position of the regulating valve group according to the current main steam pressure, the current valve position of the high-pressure regulating valve, the current power generation load and the target power generation load so that the power generation load of the generator set reaches the target power generation load.

10. An electronic device, characterized in that: include: Processor and memory; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the processor performs the method according to any one of claims 1 to 6.

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