An operation control system and method for a cold end system of a generator set

Abstract

This invention relates to the field of power plant operation control technology, specifically disclosing an operation control system and method for a generator cold-end system. The system includes a condenser and several circulating pumps, and further includes: an information acquisition module for real-time acquisition of fan load, condenser, and circulating pump operating parameters; and a calculation module for calculating the condenser pressure p based on the condenser inlet water temperature ΔT. k Based on the fan load and condenser pressure p k The calculation module is also used to calculate the incremental power of the steam turbine based on the incremental power of the steam turbine and the condenser pressure p. k The invention calculates the target operating power of the circulating pump system at the cold end based on the fan load, which includes both gas turbine load and heating load. A control module controls the speed and number of circulating pumps in operation based on the target operating power of the cold end system. This invention calculates the most economical circulating pump operating combination and speed under current operating conditions in real time, and achieves optimal automatic control of energy saving in the cold end system according to the optimal scheme.

Description

An operation control system and method for a generator set cold end system Technical Field

[0001] This invention relates to the field of power plant operation control technology, and in particular to an operation control system and method for a generator set cold end system. Background Technology

[0002] In the entire system of a thermal power plant, the turbine cold end system is an important auxiliary component that directly affects the operating efficiency of the turbine. From the perspective of energy conservation, the control and optimization of the cold end system needs to be given due attention by all workers.

[0003] In existing technologies, the design of generator set cold-end systems often involves excessive redundancy in various parameters, which, while meeting engineering requirements and generating benefits, results in a degree of waste. Therefore, how to stably control the generator set cold-end system is a technical problem that urgently needs to be solved by those skilled in the art.

[0004] Therefore, there is an urgent need for an operation control system and method for the cold end system of a generator set, in order to solve the technical problems of imperfect energy saving and optimized distribution design of the cold end system in the existing technology. Summary of the Invention

[0005] This invention provides an operation control system and method for a generator set cold-end system, which solves the technical problems of imperfect energy saving and optimized allocation design of cold-end systems in the prior art.

[0006] To address the aforementioned technical problems, this invention discloses, in one aspect, an operation control system for a generator set cold-end system, including a condenser and several circulating pumps, and further comprising:

[0007] The information acquisition module is used to collect real-time operating parameters of the fan load, condenser, and circulating pump;

[0008] The calculation module is used to calculate the condenser pressure p based on the condenser inlet water temperature ΔT. k According to the fan load and the condenser pressure p k The calculation module is also used to calculate the incremental power of the steam turbine based on the incremental power of the steam turbine and the condenser pressure p. k The target controlled operating power of the cold end system of the circulating pump is calculated based on the fan load, wherein the fan load includes the gas turbine load and the heating load;

[0009] The control module is used to adjust the operating power and control the speed and number of circulating pumps according to the target of the cold end system.

[0010] Preferably, the calculation module is further configured to calculate the condenser pressure p using the following formula.k :

[0011] t s =t c1 +△w+δt;

[0012] Among them, t s It is the saturated steam temperature corresponding to the condenser pressure, t c1 Δw is the condenser inlet water temperature, Δw is the cooling water temperature rise, and δt is the heat transfer end temperature difference.

[0013]

[0014] Where, p k It is the condenser pressure, t s It is the saturated steam temperature corresponding to the condenser pressure.

[0015] Preferably, the calculation module is further configured to calculate the power increment function of the turbine using the following formula:

[0016] △P ST =f(U GT U H p k );

[0017] Among them, △P ST It is a slight increase in power output of the steam turbine, U GT It is the gas turbine load, U H It is the heating load, p k It is the condenser pressure.

[0018] Preferably, the calculation module is further configured to calculate the control and operation equations using the following formula:

[0019] maxP CWS =△P ST -P CWP ;

[0020] Where maxP CWS It is the combined cycle unit's controlled power output, ΔP ST It is a slight increase in the power output of the steam turbine, P CWP Power consumption of the circulating pump;

[0021] maxP CWS =aP CWS -bP CWS ;

[0022] Where maxP CWS It refers to the power generation regulation of combined cycle units, aP CWS It is the net power of the combined cycle unit after regulation, bP CWS This is the net power of the combined cycle unit before regulation;

[0023] wP CWS =bP CWS -aP CWS ;

[0024] Among them, wP CWS It is the target controlled operating power of the cold end system.

[0025] Preferably, the control module includes a cold-end system power regulation matrix P and a circulating pump speed change matrix N. The cold-end system power regulation matrix P is set as P(P1, P2, P3, P4), where P1 is the first power regulation, P2 is the second power regulation, P3 is the third power regulation, and P4 is the fourth power regulation, and -20 < P1 < P2 < 0 < P3 < P4 < 20W. The circulating pump speed change matrix N is set as N(N1, N2, N3, N4), where N1 is the first circulating pump speed change, N2 is the second circulating pump speed change, N3 is the third circulating pump speed change, and N4 is the fourth circulating pump speed change, and -250 < N1 < N2 < 0 < N3 < N4 < 250 r / min.

[0026] The control module is also used to adjust the operating power (wP) of the cold-end system according to the target when the circulating pump speed is greater than 500 rpm and less than 750 rpm. CWS Based on the relationship with the target control power matrix P of the cold-end system, the speed correction control amount of the circulating pump is set:

[0027] When P1 < wP CWS When <P2, the first circulating pump speed change N1 is selected as the circulating pump speed correction control quantity;

[0028] When P2 < wP CWS When <0, the second circulating pump speed change N2 is selected as the circulating pump speed correction control quantity;

[0029] When 0 < wP CWS When <P3, the change in the third circulating pump speed N3 is selected as the speed correction control quantity of the circulating pump;

[0030] When P3 < wP CWS When <P4, the fourth circulating pump speed change N4 is selected as the circulating pump speed correction control quantity.

[0031] Preferably, the control module is further configured to set the cold-end system power regulation matrix P and the circulating pump number change matrix E. The cold-end system power regulation matrix P is set as P(P5, P6, P7, P8), where P5 is the fifth power regulation, P6 is the sixth power regulation, P7 is the seventh power regulation, and P8 is the eighth power regulation, and P5 < -40 < P6 < -20; 20 < P7 < 40 < P8 < 40W. The circulating pump number change matrix E is set as E(E1, E2, E3, E4), where E1 is the first circulating pump number change, E2 is the second circulating pump number change, E3 is the third circulating pump number change, and E4 is the fourth circulating pump number change, and -1 ≤ E1 < E2 < 0 < E3 < E4 ≤ 2, where matrix E only takes integer values.

[0032] The control module is also used to adjust the operating power wP of the cold end system according to the target of the circulating pump when the number of circulating pumps is greater than 2. CWS Based on the relationship with the target control power matrix P of the cold-end system, the number of circulating pumps is set as follows:

[0033] When P5 < wP CWS When <P6, the change in the number of the first circulating pumps, E1, is selected as the quantity control quantity of the circulating pumps;

[0034] When P6 < wP CWS When <-20, the second circulating pump quantity change amount E2 is selected as the circulating pump quantity control amount;

[0035] When 20 < wP CWS When <P7, the change in the number of the third circulating pumps, E3, is selected as the quantity control quantity of the circulating pumps;

[0036] When P7 < wP CWS When <P8, the fourth circulating pump quantity change amount E4 is selected as the circulating pump quantity control amount.

[0037] On the other hand, this application also provides an operation control method for a generator set cold-end system, the method comprising:

[0038] Real-time acquisition of various operating parameters of the fan load, condenser, and circulating pump;

[0039] Calculate the condenser pressure p based on the condenser inlet water temperature ΔT. k According to the fan load and the condenser pressure p k Calculate the slight increase in power of the steam turbine;

[0040] Based on the slight increase in turbine power and condenser pressure p k The target controlled operating power of the cold end system of the circulating pump is calculated based on the fan load, wherein the fan load includes the gas turbine load and the heating load;

[0041] The operating power of the cold end system is adjusted to control the speed and number of circulating pumps.

[0042] Preferably, the condenser pressure p is calculated based on the condenser inlet water temperature ΔT. k ,include:

[0043] The condenser pressure p k It is calculated using the following formula:

[0044] t s =t c1 +△w+δt;

[0045] Among them, t s It is the saturated steam temperature corresponding to the condenser pressure, t c1 Δw is the condenser inlet water temperature, Δw is the cooling water temperature rise, and δt is the heat transfer terminal temperature difference.

[0046]

[0047] Where, p k It is the condenser pressure, t s It is the saturated steam temperature corresponding to the condenser pressure.

[0048] Preferably, based on the fan load and the condenser pressure p k The slight increase in power output of the steam turbine is calculated using the following formula:

[0049] △P ST =f(U GT U H p k );

[0050] Among them, △P ST It is a slight increase in power output of the steam turbine, U GT It is the gas turbine load, U H It is the heating load, p k It is the condenser pressure.

[0051] 10. The operation control method for the cold end system of a generator set according to claim 7, characterized in that the control operation scheme is calculated using the following formula:

[0052] maxP CWS =△P ST -P CWP ;

[0053] Where maxP CWS It is the combined cycle unit's controlled power output, ΔP ST It is a slight increase in the power output of the steam turbine, PCWP Power consumption of the circulating pump;

[0054] maxP CWS =aP CWS -bP CWS ;

[0055] Where maxP CWS It refers to the power generation regulation of combined cycle units, aP CWS It is the net power of the combined cycle unit after regulation, bP CWS This is the net power of the combined cycle unit before regulation:

[0056] wP CWS =bP CWS -aP CWS ;

[0057] Among them, wP CWS It is the target controlled operating power of the cold end system.

[0058] The present invention provides an operation control system and method for a generator set cold end system, which, compared with the prior art, has the following advantages:

[0059] The optimal circulating pump operating combination and circulating pump speed under the current operating conditions are obtained through real-time calculation, and the energy-saving automatic control of the cold end system is achieved according to the best scheme. Attached Figure Description

[0060] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0061] Figure 1 is a schematic diagram of the cold end system of the generator set of the present invention;

[0062] Figure 2 shows the relationship between the flow rate, head, and efficiency curves of the circulating pump according to the present invention.

[0063] Figure 3 shows the relationship between the circulating pump speed, power, and quantity curves of the present invention.

[0064] Figure 4 is a functional block diagram of the operation control system of the generator cold end system of the present invention.

[0065] Figure 5 is a flowchart of the operation control method of the generator set cold end system of the present invention.

[0066] In the diagram: 1. Gas turbine; 2. Waste heat boiler; 3. Steam turbine; 4. Generator; 5. Extraction heating; 6. Cold end system; 61. Condenser; 62. Circulating pump group; 7. Power tower; 8. Condensate pump. Detailed Implementation

[0067] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0068] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0069] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0070] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0071] Referring to Figure 1, the cold-end system of the generator set in this application includes: a gas turbine 1, a waste heat boiler 2, a steam turbine 3, a generator 4, an extraction heating system 5, a cold-end system 6, a condenser 61, a circulating pump group 62, a turbine tower 7, and a condensate pump 8. The cold-end system 6 is located at the end of the steam turbine for waste heat exchange. The steam turbine tail directly connects to the condenser 61. The inlet of the condenser 61 is connected to the external turbine tower 7, and the outlet of the condenser 61 is connected to the external circulating pump group. The cold-end system of the generator set in this application mainly optimizes the cold-end system by controlling the circulating pump group.

[0072] The principle of this invention is as follows:

[0073] Referring to Figure 2-3, the results of quadratic fitting of the circulating pump flow-head curve and flow-efficiency curve are shown.

[0074] By performing a quadratic fit on the circulating pump flow-head curve, the following expression can be obtained:

[0075] H = aQ 2+bQ+c;

[0076] In the formula:

[0077] H—Pump head, in meters;

[0078] Q – Flow rate of the circulating pump, t / h;

[0079] a, b, c — coefficients.

[0080] By performing a quadratic fit on the circulating pump flow-efficiency curve, the following expression can be obtained:

[0081] H = eQ 2 +fQ+g;

[0082] In the formula:

[0083] H—Pump efficiency, m;

[0084] e, f, g — coefficients.

[0085] In a circulating cooling water system, the cooling water flow rate and circulating pump head depend on the operating point of the circulating pump, i.e., the intersection of the circulating pump flow rate-head curve and the system water resistance curve; while the circulating pump efficiency is calculated from the cooling water flow rate using the circulating pump flow rate-efficiency curve. For a combined system of multiple circulating pumps and circulating cooling water piping, different circulating pump operating modes (number of pumps and speed) will result in different flow rate-head curves for the pump combinations, while the system's water resistance characteristics can be considered constant. Therefore, the cooling water flow rate, circulating pump head, and efficiency of a circulating cooling water system ultimately depend on the circulating pump operating mode (number of pumps and speed).

[0086] Q, H, f Np, n

[0087] Np — Number of circulating pumps in operation;

[0088] N – Pump operating speed, r / min.

[0089] Referring to Figure 4, the operation control system of the generator set cold end system provided by the present invention includes an information acquisition module for real-time acquisition of various operating parameters of the fan load, condenser and circulating pump.

[0090] The calculation module is used to calculate the condenser pressure PK based on the condenser inlet water temperature ΔT, calculate the turbine power increment based on the fan load and the condenser pressure PK, and also to calculate the optimized operation scheme of the circulating pump based on the parameters.

[0091] The control module is used to control the circulating pump parameters and the number of circulating pumps in operation according to the optimized operation scheme of the circulating pump.

[0092] In some embodiments of this application, the calculation module is equipped with the condenser pressure PK equation set, including:

[0093] t s =t c1 +△w+δt;

[0094] Where TS is the saturated steam temperature corresponding to the condenser pressure, TC1 is the condenser inlet water temperature, °C, △w is the cooling water temperature rise, °C, △T is the heat transfer end difference, °C. The saturated steam temperature TS corresponding to the condenser pressure is calculated according to formula (1).

[0095] According to the Gibbs formula,

[0096]

[0097] Where PK is the condenser pressure and TS is the saturated steam temperature corresponding to the condenser pressure. The condenser pressure PK is calculated by substituting the value of formula (1) into formula (2).

[0098] In some embodiments of this application, the calculation module is provided with a turbine micro-power increase square function, including:

[0099] △P ST =f(U GT U H P K (3)

[0100] Among them, △P ST It is a slight increase in power output of the steam turbine, U GT It is the gas turbine load, U H The heating load is PK, which is the condenser pressure. The slight increase in turbine power ΔP is calculated based on the functional relationship fitted by the simulation. ST .

[0101] In some embodiments of this application, the computation module is configured with an optimized set of operating equations, including:

[0102] MAXP CWS =△P ST -P CWP (4)

[0103] Among them, MAXP CWS It is the optimized power gain of the combined cycle unit, ΔP ST It is a slight increase in the power output of the steam turbine, P CWP The power consumption of the circulating pump; derived from formula (4):

[0104] MAXP CWS =aP CWS -bP CWS (5)

[0105] Among them, MAXPCWS It is the optimized power gain of combined cycle units, AP CWS This is the optimized net power of the combined cycle unit, BP. CWS This is the net power of the combined cycle unit before optimization. Substitute BP into formula (5). CWS AP CWS Then we get:

[0106] wP CWS =bP CWS -aP CWS (6)

[0107] Among them, wP CWS It is the target optimized operating power of the cold-end system.

[0108] In some embodiments of this application, the control module includes a cold-end system power regulation matrix P and a circulating pump speed change matrix N. The cold-end system power regulation matrix P is set as P(P1, P2, P3, P4), where P1 is the first power regulation, P2 is the second power regulation, P3 is the third power regulation, and P4 is the fourth power regulation, and -20 < P1 < P2 < 0 < P3 < P4 < 20W. The circulating pump speed change matrix N is set as N(N1, N2, N3, N4), where N1 is the first circulating pump speed change, N2 is the second circulating pump speed change, N3 is the third circulating pump speed change, and N4 is the fourth circulating pump speed change, and -250 < N1 < N2 < 0 < N3 < N4 < 250 r / min.

[0109] The control module is also used to adjust the operating power (wP) of the cold-end system according to the target when the circulating pump speed is greater than 500 rpm and less than 750 rpm. CWS Based on the relationship with the target control power matrix P of the cold-end system, the speed correction control amount of the circulating pump is set:

[0110] When P1 < wP CWS When <P2, the first circulating pump speed change N1 is selected as the circulating pump speed correction control quantity;

[0111] When P2 < wP CWS When <0, the second circulating pump speed change N2 is selected as the circulating pump speed correction control quantity;

[0112] When 0 < wP CWS When <P3, the change in the third circulating pump speed N3 is selected as the speed correction control quantity of the circulating pump;

[0113] When P3 < wP CWS When <P4, the fourth circulating pump speed change N4 is selected as the circulating pump speed correction control quantity.

[0114] In some embodiments of this application, the control module is further configured to set the cold-end system power regulation matrix P and the circulating pump number change matrix E. For the cold-end system power regulation matrix P, it is set as P(P5, P6, P7, P8), where P5 is the fifth power regulation, P6 is the sixth power regulation, P7 is the seventh power regulation, and P8 is the eighth power regulation, and P5 < -40 < P6 < -20; 20 < P7 < 40 < P8 < 40W. For the circulating pump number change matrix E, it is set as E(E1, E2, E3, E4), where E1 is the first circulating pump number change, E2 is the second circulating pump number change, E3 is the third circulating pump number change, and E4 is the fourth circulating pump number change, and -1 ≤ E1 < E2 < 0 < E3 < E4 ≤ 2, where matrix E only takes integer values.

[0115] The control module is also used to adjust the operating power wP of the cold end system according to the target of the circulating pump when the number of circulating pumps is greater than 2. CWS Based on the relationship with the target control power matrix P of the cold-end system, the number of circulating pumps is set as follows:

[0116] When P5 < wP CWS When <P6, the change in the number of the first circulating pumps, E1, is selected as the quantity control quantity of the circulating pumps;

[0117] When P6 < wP CWS When <-20, the second circulating pump quantity change amount E2 is selected as the circulating pump quantity control amount;

[0118] When 20 < wP CWS When <P7, the change in the number of the third circulating pumps, E3, is selected as the quantity control quantity of the circulating pumps;

[0119] When P7 < wP CWS When <P8, the fourth circulating pump quantity change amount E4 is selected as the circulating pump quantity control amount.

[0120] Referring to Figure 5, the present invention also provides an operation control method for a generator set cold-end system, comprising:

[0121] Real-time acquisition of various operating parameters of the fan load, condenser, and circulating pump;

[0122] Calculate the condenser pressure p based on the condenser inlet water temperature ΔT. k According to the fan load and the condenser pressure p k Calculate the slight increase in power of the steam turbine;

[0123] Based on the slight increase in turbine power and condenser pressure p kThe target controlled operating power of the cold end system of the circulating pump is calculated based on the fan load, wherein the fan load includes the gas turbine load and the heating load;

[0124] The operating power of the cold end system is adjusted to control the speed and number of circulating pumps.

[0125] In some embodiments of this application, the condenser pressure p is calculated based on the condenser inlet water temperature ΔT. k ,include:

[0126] The condenser pressure p k It is calculated using the following formula:

[0127] t s =t c1 +△w+δt;

[0128] Among them, t s It is the saturated steam temperature corresponding to the condenser pressure, t c1 Δw is the condenser inlet water temperature, Δw is the cooling water temperature rise, and δt is the heat transfer terminal temperature difference.

[0129]

[0130] Where, p k It is the condenser pressure, t s It is the saturated steam temperature corresponding to the condenser pressure.

[0131] In some embodiments of this application, based on the fan load and the condenser pressure p k The slight increase in power output of the steam turbine is calculated using the following formula:

[0132] △P ST =f(U GT U H p k );

[0133] Among them, △P ST It is a slight increase in power output of the steam turbine, U GT It is the gas turbine load, U H It is the heating load, p k It is the condenser pressure.

[0134] In some embodiments of this application, the control operation scheme is calculated using the following formula:

[0135] maxP CWS =△P ST -P CWP ;

[0136] Where maxP CWSIt is the combined cycle unit's controlled power output, ΔP ST It is a slight increase in the power output of the steam turbine, P CWP Power consumption of the circulating pump;

[0137] maxP CWS =aP CWS -bP CWS ;

[0138] Where maxP CWS It refers to the power generation regulation of combined cycle units, aP CWS It is the net power of the combined cycle unit after regulation, bP CWS This is the net power of the combined cycle unit before regulation:

[0139] wP CWS =bP CWS -aP CWS ;

[0140] Among them, wP CWS It is the target controlled operating power of the cold end system.

[0141] In summary, compared with the prior art, the present invention calculates the most economical circulating pump operation combination and circulating pump speed under the current operating conditions in real time, and realizes the optimal automatic control of energy saving in the cold end system according to the best scheme.

[0142] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0143] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart illustrations and / or one or more block diagrams.

[0144] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0145] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An operation control system for a generator set cold-end system, comprising a condenser and several circulating pumps, characterized in that, Also includes: The information acquisition module is used to collect real-time operating parameters of the fan load, condenser, and circulating pump; The calculation module is used to calculate the condenser pressure pk based on the condenser inlet water temperature, and to calculate the turbine power increment based on the fan load and the condenser pressure pk. The calculation module is also used to calculate the target control operating power of the cold end system of the circulating pump based on the turbine power increment, the condenser pressure pk and the fan load. The fan load includes the gas turbine load and the heating load. The control module is used to control the speed and number of circulating pumps according to the target operating power of the cold-end system. The control module includes a cold-end system power control matrix P and a circulating pump speed change matrix N. The cold-end system power control matrix P is set as P(P1, P2, P3, P4), where P1 is the first power control amount, P2 is the second power control amount, P3 is the third power control amount, and P4 is the fourth power control amount, and -20 < P1 < P2 < 0 < P3. <P4<20W; For the circulating pump speed change matrix N, set N(N1, N2, N3, N4), where N1 is the first circulating pump speed change, N2 is the second circulating pump speed change, N3 is the third circulating pump speed change, and N4 is the fourth circulating pump speed change, and -250<N1<N2<0<N3<N4<250r / min; The control module is also used to adjust the operating power W according to the target of the cold end system when the circulating pump speed is greater than 500 and less than 750. Based on the relationship with the target control power matrix P of the cold-end system, the speed correction control amount of the circulating pump is set: when P1 < w When P2 < w, the change in the first circulating pump speed N1 is selected as the speed correction control quantity of the circulating pump; when P2 < w When 0 < w, the second circulating pump speed change N2 is selected as the circulating pump speed correction control quantity; when 0 < w When P3 < w, the third circulating pump speed change N3 is selected as the circulating pump speed correction control quantity; when P3 < w When <P4, the fourth circulating pump speed change N4 is selected as the circulating pump speed correction control quantity; the control module is also used to set the cold end system power regulation quantity matrix P and the circulating pump quantity change quantity matrix E. For the cold end system power regulation quantity matrix P, it is set as P(P5,P6,P7,P8), where P5 is the fifth power regulation quantity, P6 is the sixth power regulation quantity, P7 is the seventh power regulation quantity, P8 is the eighth power regulation quantity, and P5 < -40 < P6 < -20; 2 0 < P7 < 40 < P8 < 40W; For the circulating pump number change matrix E, set E(E1, E2, E3, E4), where E1 is the first circulating pump number change, E2 is the second circulating pump number change, E3 is the third circulating pump number change, and E4 is the fourth circulating pump number change, and -1 ≤ E1 < E2 < 0 < E3 < E4 ≤ 2, where matrix E only takes integer values; The control module is also used to adjust the operating power W according to the target of the cold end system when the number of circulating pumps is greater than 2. Based on the relationship with the target control power matrix P of the cold-end system, the number of circulating pumps is controlled as follows: when P5 < w When P6 < w, the change in the number of the first circulating pumps, E1, is selected as the quantity control quantity for the circulating pumps; when P6 < w When 20 < -20, the second circulating pump quantity change E2 is selected as the circulating pump quantity control quantity; when 20 < w When P7 < w, the change in the number of the third circulating pump is selected as the quantity control quantity of the circulating pump; when P7 < w When <P8, the fourth circulating pump quantity change amount E4 is selected as the circulating pump quantity control amount.

2. The operation control system of the generator set cold end system according to claim 1, characterized in that, The calculation module is also used to calculate the condenser pressure pk using the following formula: ts=tc1+△w+δt; where ts is the saturated steam temperature corresponding to the condenser pressure, tc1 is the condenser inlet water temperature, △w is the cooling water temperature rise, and δt is the heat transfer end difference. Where pk is the condenser pressure and ts is the saturated steam temperature corresponding to the condenser pressure.

3. The operation control system of the generator set cold end system according to claim 2, characterized in that, The calculation module is also used to calculate the power increment function of the steam turbine using the following formula: ;in, It is the gas turbine load. PK is the heating load, and pk is the condenser pressure.

4. The operation control system of the generator set cold end system according to claim 3, characterized in that, The calculation module is also used to calculate the target controlled operating power using the following formula: ;in, It is the combined cycle unit's power generation regulation. It is a slight increase in the power output of the steam turbine. Power consumption of the circulating pump; =a －b ;in, It refers to the power generation regulation of combined cycle units, a It is the net power of the combined cycle unit after regulation, b This is the net power output of the combined cycle unit before regulation; w =b －a Among them, w It is the target controlled operating power of the cold end system.

5. A method for operating control of a generator set cold-end system, applied in the operating control system of the generator set cold-end system as described in any one of claims 1-4, characterized in that, include: The system collects real-time operating parameters of the fan load, condenser, and circulating pump; calculates the condenser pressure pk based on the condenser inlet water temperature; calculates the turbine power increment based on the fan load and condenser pressure pk; and calculates the target control operating power of the circulating pump's cold end system based on the turbine power increment, condenser pressure pk, and fan load, where the fan load includes the gas turbine load and heating load. The operating power of the cold end system is adjusted to control the speed and number of circulating pumps.

6. The operation control method for the cold end system of a generator set according to claim 5, characterized in that, The condenser pressure pk is calculated based on the condenser inlet water temperature, including: the condenser pressure pk is calculated using the following formula: ts = tc1 + Δw + δt; where ts is the saturated steam temperature corresponding to the condenser pressure, tc1 is the condenser inlet water temperature, Δw is the cooling water temperature rise, and δt is the heat transfer terminal temperature difference. Where pk is the condenser pressure and ts is the saturated steam temperature corresponding to the condenser pressure.

7. The operation control method for the cold end system of a generator set according to claim 6, characterized in that, The slight increase in turbine power, based on the fan load and the condenser pressure pk, is calculated using the following formula: ;in, It is the gas turbine load. PK is the heating load, and pk is the condenser pressure.

8. The operation control method for the cold end system of a generator set according to claim 7, characterized in that, The target controlled operating power is calculated using the following formula: ;in, It is the combined cycle unit's power generation regulation. It is a slight increase in the power output of the steam turbine. Power consumption of the circulating pump; =a －b ;in, It refers to the power generation regulation of combined cycle units, a It is the net power of the combined cycle unit after regulation, b The net power of the combined cycle unit before regulation: w =b －a Among them, w It is the target controlled operating power of the cold end system.

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