Automatic cruise system for wide-load operation of thermal power generating unit

Abstract

The invention relates to the technical field of automatic control of thermal power generating units, and discloses an automatic cruise system for wide-load operation of a thermal power generating unit, which comprises a multi-dimensional acquisition module, a cruise analysis module and an intelligent control module. According to the system, data sets are respectively acquired through the multi-dimensional acquisition module, and the prevention and diagnosis unit judges the safety of the wide-load working condition of the thermal power generating unit according to the data sets and generates a corresponding instruction, so that the whole-course rapid variable-load automatic control of the thermal power generating unit within the range of 15%-100% Pe is realized; according to the automatic cruise control method, the system and the device, key parameters in the operation state of the thermal power generating unit are ensured to be included in a safe operation range, after the cruise analysis module receives different instructions, different cruise data sets Xhsj and supply and demand indexes Gxzs are calculated and generated according to the operation data set, the load data set and the standard data set, the automatic cruise control accuracy is high in quick response to load fluctuation, and the automatic cruise control accuracy is high. And the intelligent control module decides to use peak regulation and frequency modulation schemes in different stages, so that the peak regulation and frequency modulation capability is high and the safety is higher.

Description

Technical Field

[0001] The invention relates to the technical field of automatic control of thermal power generation units, in particular to an automatic cruise system for wide load operation of thermal power generation units. Background Art

[0002] In modern power systems, thermal power units are one of the main power generation equipment, and their stable and efficient operation is crucial to ensuring the safety and reliable power supply of the power grid. With the development of the power market and the advancement of technology, thermal power units need to adapt to frequently changing load demands, and are usually automatically controlled through an automatic cruise system to achieve efficient operation of thermal power units within a wide load range. The automatic cruise system is an advanced control system that automatically adjusts the operating parameters of the unit by real-time monitoring of the operating status of the unit and the load demand of the power grid to achieve optimal operating efficiency and minimum emissions. The automatic cruise system is usually composed of sensors, controllers and actuators, and can achieve precise control of key parameters such as unit fuel supply, air flow, and water flow. The ultimate goal of the unit's wide load fast and flexible peak-shaving intelligent control is to achieve automatic cruising under wide load operation of the unit. Automatic cruising means that within the load range of deep peak-shaving of 15%-100% Pe, the unit automatically rises or falls to another target load condition through the AGC coordinated control system combined with the current load condition without human operation. During the load variation process of deep peak regulation of the unit, the dynamic characteristics of the controlled object coordinated by the unit AGC will change significantly. Even before and after the unit's "dry / wet" state conversion, the controlled object coordinated by the unit AGC will be completely different. The unit's adaptive and self-regulating control under deep peak regulation is to target the changes of the controlled object during the above-mentioned deep load regulation process, and effectively control the entire deep load regulation process of the unit by automatically adjusting the parameters and structure of the control system, or directly switching smoothly to another new advanced control system.

[0003] At present, when the traditional automatic cruise system used for wide load operation of thermal power units faces load peaks with large dynamic characteristics and rapid changes, the adjustment decision process needs to rely on manual judgment on whether key operating parameters such as the unit's steam temperature and main steam pressure can be maintained within the safe operating range. It is easy to make misjudgments and has a slow response speed. The automatic control peak and frequency regulation capabilities of thermal power units are limited and cannot meet the requirements for automatic cruise of unit loads under deep peak regulation. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the present invention provides an automatic cruise system for wide load operation of thermal power units, which has the advantages of rapid response to load fluctuations, high automatic cruise accuracy, strong peak-shaving and frequency regulation capabilities, and higher safety. It solves the problem that traditional automatic cruise systems for wide load operation of thermal power units rely on manual decision-making, have slow response speed, and have limited automatic control peak-shaving and frequency regulation capabilities.

[0006] (II) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solutions: an automatic cruise system for wide load operation of thermal power units, comprising a multi-dimensional acquisition module, a cruise analysis module and an intelligent control module;

[0008] The multi-dimensional acquisition module includes an operation data unit, a load demand unit and a preventive diagnosis unit. The operation data unit is connected to the AGC coordination control system through a network to collect an operation data set, and transmits it to the preventive diagnosis unit through the network. The load demand unit is connected to the load sensor through a network to collect a load data set, and transmits it to the preventive diagnosis unit through the network. The preventive diagnosis unit collects a standard data set through a network connection database, and compares the operation data set and the load data set with the standard data set to determine the safety of the wide load condition of the thermal power unit, and generates corresponding instructions and transmits them to the cruise analysis module. The multi-dimensional acquisition module is connected to the cruise analysis module through a network;

[0009] After receiving different instructions, the cruise analysis module calculates and generates different cruise data groups Xhsj and supply and demand indexes Gxzs according to the operation data set, load data set and standard data set. The cruise analysis module is connected to the intelligent control module through the network;

[0010] The intelligent control module decides to use peak-shaving and frequency-regulating schemes at different stages according to different supply and demand indexes Gxzs, and connects to the AGC coordination control system through the network to perform peak-shaving and frequency-regulating operations or implement safety protection measures.

[0011] Preferably, the operating data set includes real-time data collected by the AGC coordinated control system when the thermal power unit is in operation. The expression of the operating data set is: e represents the operating parameters of the thermal power unit, which include the temperature, pressure, flow, level, vibration frequency, fuel quantity and emission concentration inside the boiler and turbine. w represents the environmental parameters of the thermal power unit, which include the temperature, pressure, humidity and wind speed outside the boiler and turbine. to These correspond in turn to the temperature, pressure, flow, liquid level, vibration frequency, fuel quantity and emission concentration inside the boiler and steam turbine, as well as the temperature, air pressure, humidity and wind speed outside the boiler and steam turbine under the real-time operating state of the thermal power unit.

[0012] Preferably, the load data set includes load data collected by the load sensor in real time, and the expression of the load data set is: g represents the load demand that the load sensor has clearly received at the moment, and y represents the load fluctuation that the load sensor predicts will occur. The load sensor predicts the upcoming load demand based on historical load data, thermal power unit work logs and weather forecast information. to This corresponds in turn to the load demand received by the load sensor in real time and the real-time prediction of the upcoming load fluctuation.

[0013] Preferably, the standard data set includes the thermal power unit operation standard and the rated load standard, both of which are obtained through the thermal power unit safety operation manual. The expression of the standard data set is {BZ yx , BZ fh}, thermal power unit operation standard BZ yx Specifically, the temperature threshold, pressure threshold, flow threshold, liquid level threshold, vibration frequency threshold, fuel quantity threshold and emission concentration threshold inside the boiler and turbine of the thermal power unit under safe operation, as well as the temperature threshold, air pressure threshold, humidity threshold and wind speed threshold outside the boiler and turbine, the rated load standard BZ fh Specifically, it is 15%-100% Pe.

[0014] Preferably, any value in the operating data set exceeds the thermal power unit operating standard BZ yx When the preventive diagnosis unit determines that the current thermal power unit is overloaded, generates an overload protection instruction and transmits it to the cruise analysis module. If any value in the load data set exceeds the rated load standard BZ fh When the preventive diagnosis unit determines that the current load demand exceeds the rated load range, generates an overload protection instruction and transmits it to the cruise analysis module. All values ​​in the operation data set and the load data set do not exceed the thermal power unit operation standard BZ yx and rated load standard BZ fh When the preventive diagnosis unit determines that the current operation status of the thermal power unit is normal and the current load demand is within the rated load range, a safety compliance instruction is generated and transmitted to the cruise analysis module. The values ​​in the operation data set and the load data set exceed the thermal power unit operation standard BZ yx and rated load standard BZ fh When the preventive diagnosis unit determines that the current operating status of the thermal power unit is overloaded and the current load demand exceeds the rated load range, it generates a danger alarm instruction and transmits it to the intelligent control module.

[0015] Preferably, after receiving the overload protection instruction, the cruise analysis module calculates and generates the cruise data group Xhsj and the supply and demand index Gxzs according to the operation data set, the load data set and the standard data set. The calculation process is as follows:

[0016] According to the overload protection instruction, the operation data set is filtered and the operation data set that exceeds the thermal power unit operation standard BZ is counted. yx The temperature value, pressure value, flow value, liquid level value, vibration frequency, fuel quantity, emission concentration inside the boiler and steam turbine or the temperature value, air pressure value, humidity value, wind speed value outside the boiler and steam turbine, denoted as C J ;

[0017] According to the operating data set and the standard data set, the cruise data set Xhsj is calculated and generated;

[0018] Xhsj=C J -BZ yx

[0019] In the formula, Xhsj represents the cruise data group, C J -BZ yx Indicates the difference between the actual operating data and the standard operating data of the thermal power unit under the overload condition, and obtains the cruise data group containing specific frequency regulation parameters;

[0020] Calculate and generate the supply and demand index Gxzs based on the operation data set, load data set and standard data set;

[0021]

[0022] In the formula, Gxzs represents the supply and demand index, α - In the case of downward adjustment of operating data, the supply and demand index calculation formula converts the operating data of thermal power units into fixed parameters of power supply. It indicates the total power supply provided by the thermal power unit after the operation data of the cruise data group Xhsj is lowered, Fn g+y It represents the actual load demand obtained by summing the load demand received in real time from the load data set and the load fluctuation predicted in real time. It represents the ratio of the total power supply provided by the thermal power units to the actual load demand after the operating data is lowered according to the cruise data group Xhsj, that is, the supply and demand index representing the supply and demand relationship between the thermal power units and the load.

[0023] Preferably, after receiving the excess protection instruction, the cruise analysis module calculates and generates the supply and demand index Gxzs and the cruise data group Xhsj according to the operation data set, the load data set and the standard data, and the calculation process is as follows:

[0024] According to the overload protection instruction, the load data set is filtered and the load data set that exceeds the rated load standard BZ is counted. fh The real-time received load demand or the real-time predicted load demand to be generated is denoted as C F ;

[0025] According to the load data set and the standard data set, the cruise data set Xhsj is calculated and generated;

[0026] Xhsj=C F -BZ yx

[0027] In the formula, Xhsj represents the cruise data group, C F -BZ yx Indicates the difference between the actual load data and the rated load standard data when the current load demand exceeds the rated load range, and obtains a cruise data group containing specific frequency modulation parameters;

[0028] Calculate and generate the supply and demand index Gxzs based on the operation data set, load data set and standard data set;

[0029]

[0030] In the formula, Gxzs represents the supply and demand index, and α represents the fixed parameter used in the supply and demand index calculation formula to convert the thermal power unit operation data into power supply. It indicates the maximum value of the total power supply of the thermal power unit after the operation data is adjusted upward according to the cruise data group Xhsj, Fn g+y It represents the actual load demand obtained by summing the load demand received in real time from the load data set and the load fluctuation predicted in real time. It represents the ratio of the maximum total power supply of the thermal power units to the actual load demand after the operating data is adjusted upward according to the cruise data group Xhsj, that is, the supply and demand index representing the supply and demand relationship between the thermal power units and the load.

[0031] Preferably, after receiving the safety compliance instruction, the cruise analysis module calculates and generates the supply and demand index Gxzs according to the operation data set and the load data set, and the calculation process is as follows:

[0032]

[0033] In the formula, Gxzs represents the supply and demand index, and α represents the fixed parameter used in the supply and demand index calculation formula to convert the thermal power unit operation data into power supply. It represents the actual power supply obtained by converting the operating data of the thermal power units in the operating data set. g+y It represents the actual load demand obtained by summing the load demand received in real time from the load data set and the load fluctuation predicted in real time. It represents the ratio of the actual power supply of thermal power units to the actual load demand, that is, the supply and demand index that represents the supply and demand relationship between thermal power units and loads.

[0034] Preferably, the intelligent control module decides to use the peak-shaving and frequency regulation scheme of the dry-state deep load section of the unit according to the supply and demand index Gxzs when the thermal power unit is in an overload state, and the AGC coordinated control system performs peak-shaving and frequency regulation operations according to the cruise data group Xhsj when the thermal power unit is in an overload state. The intelligent control module decides to use the peak-shaving and frequency regulation scheme of the normal peak-shaving load section according to the supply and demand index Gxzs when the real-time load demand exceeds the rated load range, and the AGC coordinated control system performs peak-shaving and frequency regulation operations according to the cruise data group Xhsj when the thermal power unit is in an overload state. If the supply and demand index Gxzs is calculated and generated by the cruise analysis module after receiving the safety and compliance instruction, the intelligent control module decides to use the peak-shaving and frequency regulation scheme of the unit's dry-wet conversion load section and the unit's wet deep load section, and maintains the combustion stability of the thermal power unit through the AGC coordinated control system.

[0035] Preferably, after receiving the danger alarm instruction, the intelligent control module executes safety protection measures through the AGC coordinated control system to cut off power to protect the thermal power unit and the load sensor.

[0036] Compared with the prior art, the present invention provides an automatic cruise system for wide load operation of thermal power units, which has the following beneficial effects:

[0037] 1. The present invention sets an operation data unit, a load demand unit and a preventive diagnosis unit through a multi-dimensional acquisition module, and respectively collects an operation data set, a load data set and a standard data set. The preventive diagnosis unit compares the operation data set and the load data set with the standard data set to determine the safety of the wide load condition of the thermal power unit, and generates an overload protection instruction, an excess protection instruction, a safety compliance instruction or a danger alarm instruction, thereby realizing the full-range rapid load change automatic control of the thermal power unit within the range of 15%-100%Pe, and ensuring that the key parameters of the thermal power unit under the operating state are all included in the safe operating range. After receiving different instructions, the cruise analysis module calculates and generates different cruise data groups Xhsj and supply and demand indexes Gxzs according to the operation data set, the load data set and the standard data set, and quickly responds to load fluctuations with high automatic cruise accuracy.

[0038] 2. The present invention uses an intelligent control module to decide on the peak-shaving and frequency-regulating schemes of the unit's dry deep load regulation segment (50%-30% Pe), normal peak-shaving load segment (100%-50% Pe), unit's dry-wet conversion load segment or unit's wet deep load regulation segment (30%-15% Pe) according to different supply and demand indexes Gxzs, and performs peak-shaving and frequency-regulating operations or executes safety protection measures through the AGC coordinated control system, with strong peak-shaving and frequency-regulating capabilities and higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the system flow of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1 , an automatic cruise system for wide load operation of thermal power units, including a multi-dimensional acquisition module, a cruise analysis module and an intelligent control module;

[0042] The multi-dimensional acquisition module includes an operation data unit, a load demand unit, and a preventive diagnosis unit. The operation data unit collects the operation data set through a network connection to the AGC coordination control system and transmits it to the preventive diagnosis unit through the network. The operation data set includes the real-time data collected by the AGC coordination control system under the operation state of the thermal power unit. The expression of the operation data set is: e represents the operating parameters of the thermal power unit, which include the temperature, pressure, flow, level, vibration frequency, fuel quantity and emission concentration inside the boiler and turbine. w represents the environmental parameters of the thermal power unit, which include the temperature, pressure, humidity and wind speed outside the boiler and turbine. to The data correspond to the temperature, pressure, flow, level, vibration frequency, fuel quantity and emission concentration inside the boiler and turbine, and the temperature, pressure, humidity and wind speed outside the boiler and turbine under the real-time operation state of the thermal power unit. Multiple parameters in the operation data are crucial to ensure the safety, economy and power supply efficiency of the thermal power unit. Through real-time monitoring and analysis of multiple parameters, abnormal situations can be discovered and handled in time, thereby ensuring the stability and reliability of power supply, which helps to improve the peak and frequency regulation performance of the thermal power unit.

[0043] The load demand unit collects the load data set through the network connection load sensor and transmits it to the preventive diagnosis unit through the network. The load data set includes the load data collected by the load sensor in real time. The expression of the load data set is: g represents the load demand that the load sensor has clearly received at the moment, and y represents the load fluctuation that the load sensor predicts will occur. The load sensor predicts the upcoming load demand based on historical load data, thermal power unit work logs and weather forecast information. to The load demand received by the load sensor in real time and the load fluctuation predicted in real time correspond to each other. For example, if the load demand value is x, the load fluctuation predicted to be generated is ±y. Reasonable prediction of future load demand is conducive to the subsequent rapid allocation of frequency modulation parameters of thermal power units, ensuring the balance between supply and demand, and ensuring that the automatic cruise system can select the most economical operation strategy under different load demands;

[0044] The preventive diagnosis unit collects standard data sets through a network connection to the database, and compares the operating data set and the load data set with the standard data set to determine the safety of the wide load conditions of the thermal power unit, and generates corresponding instructions and transmits them to the cruise analysis module. The multi-dimensional acquisition module is connected to the cruise analysis module through the network;

[0045] The standard data set includes the operation standard and rated load standard of thermal power units. The operation standard and rated load standard of thermal power units are obtained from the safety operation manual of thermal power units. The expression of the standard data set is {BZ yx , BZ fh}, thermal power unit operation standard BZ yx Specifically, the temperature threshold, pressure threshold, flow threshold, liquid level threshold, vibration frequency threshold, fuel quantity threshold and emission concentration threshold inside the boiler and turbine of the thermal power unit under safe operation, as well as the temperature threshold, air pressure threshold, humidity threshold and wind speed threshold outside the boiler and turbine, the rated load standard BZ fh Specifically, 15%-100% Pe;

[0046] Any value in the operating data set exceeds the thermal power unit operating standard BZ yx When the preventive diagnosis unit determines that the current thermal power unit is overloaded, the power output of the thermal power unit is greater than the load demand, and the overload protection instruction is generated and transmitted to the cruise analysis module. If any value in the load data set exceeds the rated load standard BZ fh When the preventive diagnosis unit determines that the current load demand exceeds the rated load range, the power output of the thermal power unit is less than the load demand, and generates an excess protection instruction and transmits it to the cruise analysis module. All values ​​in the operation data set and the load data set do not exceed the thermal power unit operation standard BZ yxand rated load standard BZ fh When the preventive diagnosis unit determines that the current operation status of the thermal power unit is normal and the current load demand is within the rated load range, the power supply output of the thermal power unit is relatively balanced with the load demand, and the safety compliance instruction is generated and transmitted to the cruise analysis module. The values ​​in the operation data set and the load data set exceed the thermal power unit operation standard BZ. yx and rated load standard BZ fh When the preventive diagnosis unit determines that the current operating state of the thermal power unit is overloaded and the current load demand exceeds the rated load range, the power supply and load demand of the thermal power unit are both in extreme states, and a danger alarm instruction is generated and transmitted to the intelligent control module, realizing the full-range rapid load change automatic control of the thermal power unit within the range of 15%-100%Pe, and ensuring that the key parameters of the thermal power unit in the operating state are within the safe operating range;

[0047] After receiving different instructions, the cruise analysis module calculates and generates different cruise data groups Xhsj and supply and demand indexes Gxzs according to the operation data set, load data set and standard data set. The cruise analysis module is connected to the intelligent control module through the network;

[0048] After receiving the overload protection instruction, the cruise analysis module calculates and generates the cruise data group Xhsj and the supply and demand index Gxzs according to the operation data set, load data set and standard data set. The calculation process is as follows:

[0049] According to the overload protection instruction, the operation data set is filtered and the operation data set that exceeds the thermal power unit operation standard BZ is counted. yx The temperature value, pressure value, flow value, liquid level value, vibration frequency, fuel quantity, emission concentration inside the boiler and steam turbine or the temperature value, air pressure value, humidity value, wind speed value outside the boiler and steam turbine, denoted as C J ;

[0050] According to the operating data set and the standard data set, the cruise data set Xhsj is calculated and generated;

[0051] Xhsj=C J -BZ yx

[0052] In the formula, Xhsj represents the cruise data group, C J -BZ yx Indicates the difference between the actual operating data and the standard operating data when the thermal power unit is in overload state, and obtains the cruise data group containing specific frequency regulation parameters, which can quickly respond to load fluctuations, thereby lowering the operating data of the thermal power unit, and the automatic cruise has high accuracy;

[0053] Calculate and generate the supply and demand index Gxzs based on the operation data set, load data set and standard data set;

[0054]

[0055] In the formula, Gxzs represents the supply and demand index, α - In the case of downward adjustment of operating data, the supply and demand index calculation formula converts the operating data of thermal power units into fixed parameters of power supply. It indicates the total power supply provided by the thermal power unit after the operation data of the cruise data group Xhsj is lowered, Fn g+y It represents the actual load demand obtained by summing the load demand received in real time from the load data set and the load fluctuation predicted in real time. It indicates the ratio of the total power supply provided by the thermal power unit to the actual load demand after the operation data is adjusted down according to the cruise data group Xhsj, that is, the supply and demand index indicating the supply and demand relationship between the thermal power unit and the load. It can quickly analyze the supply and demand relationship for load fluctuations with large and fast dynamic characteristics, thus ensuring the strong peak and frequency regulation capability of the thermal power unit.

[0056] After receiving the excess protection instruction, the cruise analysis module calculates and generates the supply and demand index Gxzs and the cruise data group Xhsj according to the operation data set, load data set and standard data. The calculation process is as follows:

[0057] According to the overload protection instruction, the load data set is filtered and the load data set that exceeds the rated load standard BZ is counted. fh The real-time received load demand or the real-time predicted load demand to be generated is denoted as C F ;

[0058] According to the load data set and the standard data set, the cruise data set Xhsj is calculated and generated;

[0059] Xhsj=C F -BZ yx

[0060] In the formula, Xhsj represents the cruise data group, C F -BZ yx Indicates the difference between the actual load data and the rated load standard data when the current load demand exceeds the rated load range, and obtains a cruise data group containing specific frequency modulation parameters, which quickly responds to load fluctuations, thereby adjusting the operating data of the thermal power unit, and the automatic cruise has high accuracy;

[0061] Calculate and generate the supply and demand index Gxzs based on the operation data set, load data set and standard data set;

[0062]

[0063] In the formula, Gxzs represents the supply and demand index, and α represents the fixed parameter used in the supply and demand index calculation formula to convert the thermal power unit operation data into power supply. It indicates the maximum value of the total power supply of the thermal power unit after the operation data is adjusted upward according to the cruise data group Xhsj, Fn g+y It represents the actual load demand obtained by summing the load demand received in real time from the load data set and the load fluctuation predicted in real time. It indicates the ratio of the maximum total power supply of the thermal power unit to the actual load demand after the operation data is adjusted according to the cruise data group Xhsj, that is, the supply and demand index that represents the supply and demand relationship between the thermal power unit and the load. It can quickly analyze the supply and demand relationship for load fluctuations with large and fast dynamic characteristics, thus ensuring the strong peak and frequency regulation capabilities of the thermal power unit.

[0064] After receiving the safety compliance instruction, the cruise analysis module calculates and generates the supply and demand index Gxzs based on the operation data set and the load data set. The calculation process is as follows:

[0065]

[0066] In the formula, Gxzs represents the supply and demand index, and α represents the fixed parameter used in the supply and demand index calculation formula to convert the thermal power unit operation data into power supply. It represents the actual power supply obtained by converting the operating data of the thermal power units in the operating data set. g+y It represents the actual load demand obtained by summing the load demand received in real time from the load data set and the load fluctuation predicted in real time. It represents the ratio of the actual power supply of the thermal power unit to the actual load demand, that is, the supply and demand index that represents the supply and demand relationship between the thermal power unit and the load. Within the safe operation range, it meets the technical requirements for automatic cruise of the thermal power unit load under deep peak regulation;

[0067] The intelligent control module decides to use the peak-shaving and frequency-regulating scheme of the dry deep load section (50%-30%Pe) of the unit according to the supply and demand index Gxzs when the thermal power unit is in an overload state, reduces the boiler load, and improves the uniformity of fuel and air distribution. The AGC coordinated control system performs peak-shaving and frequency-regulating operations according to the cruise data group Xhsj when the thermal power unit is in an overload state. The intelligent control module decides to use the peak-shaving and frequency-regulating scheme of the normal peak-shaving load section (100%-50%Pe) according to the supply and demand index Gxzs when the real-time load demand exceeds the rated load range, optimizes and adjusts the internal combustion environment of the thermal power unit, and the AGC coordinated control system performs peak-shaving and frequency-regulating operations according to the cruise data group Xhsj when the thermal power unit is in an overload state. The cruise data group Xhsj under the overload state of the unit is subjected to peak-shaving and frequency-regulating operations. If the supply and demand index Gxzs is calculated and generated by the cruise analysis module after receiving the safety and compliance instructions, the intelligent control module decides to use the peak-shaving and frequency-regulating schemes of the unit's dry-wet state conversion load segment and the unit's wet state deep adjustment load segment (30%-15% Pe), accurately controls the water level, maintains combustion stability, and maintains the combustion stability of the thermal power unit through the AGC coordinated control system. After receiving the danger alarm instruction, the intelligent control module executes safety protection measures through the AGC coordinated control system to cut off the power to protect the thermal power unit and load sensor, with strong peak-shaving and frequency-regulating capabilities and higher safety.

[0068] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic cruise system for wide load operation of thermal power units, characterized in that: Including multi-dimensional acquisition module, cruise analysis module and intelligent control module; The multi-dimensional acquisition module includes an operation data unit, a load demand unit and a preventive diagnosis unit. The operation data unit is connected to the AGC coordination control system through a network to collect an operation data set, and transmits it to the preventive diagnosis unit through the network. The load demand unit is connected to the load sensor through a network to collect a load data set, and transmits it to the preventive diagnosis unit through the network. The preventive diagnosis unit collects a standard data set through a network connection database, and compares the operation data set and the load data set with the standard data set to determine the safety of the wide load condition of the thermal power unit, and generates corresponding instructions and transmits them to the cruise analysis module. The multi-dimensional acquisition module is connected to the cruise analysis module through a network; After receiving different instructions, the cruise analysis module calculates and generates different cruise data groups Xhsj and supply and demand indexes Gxzs according to the operation data set, load data set and standard data set. The cruise analysis module is connected to the intelligent control module through the network; The intelligent control module decides to use peak-shaving and frequency-regulating schemes at different stages according to different supply and demand indexes Gxzs, and connects to the AGC coordination control system through the network to perform peak-shaving and frequency-regulating operations or implement safety protection measures.

2. The automatic cruise system for wide load operation of thermal power units according to claim 1, characterized in that: The operating data set includes real-time data collected by the AGC coordinated control system when the thermal power unit is in operation. The expression of the operating data set is: e represents the operating parameters of the thermal power unit, which include the temperature, pressure, flow, level, vibration frequency, fuel quantity and emission concentration inside the boiler and turbine. w represents the environmental parameters of the thermal power unit, which include the temperature, pressure, humidity and wind speed outside the boiler and turbine. to These correspond in turn to the temperature, pressure, flow, liquid level, vibration frequency, fuel quantity and emission concentration inside the boiler and steam turbine, as well as the temperature, air pressure, humidity and wind speed outside the boiler and steam turbine under the real-time operating state of the thermal power unit.

3. The automatic cruise system for wide load operation of thermal power units according to claim 2, characterized in that: The load data set includes load data collected by the load sensor in real time. The expression of the load data set is: g represents the load demand that the load sensor has clearly received at the moment, and y represents the load fluctuation that the load sensor predicts will occur. The load sensor predicts the upcoming load demand based on historical load data, thermal power unit work logs and weather forecast information. to This corresponds in turn to the load demand received by the load sensor in real time and the real-time prediction of the upcoming load fluctuation.

4. The automatic cruise system for wide load operation of thermal power units according to claim 3, characterized in that: The standard data set includes the operation standard and rated load standard of the thermal power unit. The operation standard and rated load standard of the thermal power unit are obtained from the safety operation manual of the thermal power unit. The expression of the standard data set is {BZ yx , BZ fh }, thermal power unit operation standard BZ yx Specifically, the temperature threshold, pressure threshold, flow threshold, liquid level threshold, vibration frequency threshold, fuel quantity threshold and emission concentration threshold inside the boiler and turbine of the thermal power unit under safe operation, as well as the temperature threshold, air pressure threshold, humidity threshold and wind speed threshold outside the boiler and turbine, the rated load standard BZ fh Specifically, it is 15%-100% Pe.

5. The automatic cruise system for wide load operation of thermal power units according to claim 4, characterized in that: Any value in the operating data set exceeds the thermal power unit operating standard BZ yx When the preventive diagnosis unit determines that the current thermal power unit is overloaded, generates an overload protection instruction and transmits it to the cruise analysis module. If any value in the load data set exceeds the rated load standard BZ fh When the preventive diagnosis unit determines that the current load demand exceeds the rated load range, generates an overload protection instruction and transmits it to the cruise analysis module. All values ​​in the operation data set and the load data set do not exceed the thermal power unit operation standard BZ yx and rated load standard BZ fh When the preventive diagnosis unit determines that the current operation status of the thermal power unit is normal and the current load demand is within the rated load range, a safety compliance instruction is generated and transmitted to the cruise analysis module. The values ​​in the operation data set and the load data set exceed the thermal power unit operation standard BZ yx and rated load standard BZ fh When the preventive diagnosis unit determines that the current operating status of the thermal power unit is overloaded and the current load demand exceeds the rated load range, it generates a danger alarm instruction and transmits it to the intelligent control module.

6. The automatic cruise system for wide load operation of thermal power units according to claim 5, characterized in that: After receiving the overload protection instruction, the cruise analysis module calculates and generates the cruise data group Xhsj and the supply and demand index Gxzs according to the operation data set, the load data set and the standard data set. The calculation process is as follows: According to the overload protection instruction, the operation data set is filtered and the operation data set that exceeds the thermal power unit operation standard BZ is counted. yx The temperature value, pressure value, flow value, liquid level value, vibration frequency, fuel quantity, emission concentration inside the boiler and steam turbine or the temperature value, air pressure value, humidity value, wind speed value outside the boiler and steam turbine, denoted as C J ; According to the operating data set and the standard data set, the cruise data set Xhsj is calculated and generated; Xhsj=C J -BZ yx In the formula, Xhsj represents the cruise data group, C J -BZ yx Indicates the difference between the actual operating data and the standard operating data of the thermal power unit under the overload condition, and obtains the cruise data group containing specific frequency regulation parameters; Calculate and generate the supply and demand index Gxzs based on the operation data set, load data set and standard data set; In the formula, Gxzs represents the supply and demand index, α - In the case of downward adjustment of operating data, the supply and demand index calculation formula converts the operating data of thermal power units into fixed parameters of power supply. It indicates the total power supply provided by the thermal power unit after the operation data of the cruise data group Xhsj is lowered, Fn g+y It represents the actual load demand obtained by summing the load demand received in real time from the load data set and the load fluctuation predicted in real time. It represents the ratio of the total power supply provided by the thermal power units to the actual load demand after the operating data is lowered according to the cruise data group Xhsj, that is, the supply and demand index representing the supply and demand relationship between the thermal power units and the load.

7. The automatic cruise system for wide load operation of thermal power units according to claim 6, characterized in that: After receiving the excess protection instruction, the cruise analysis module calculates and generates the supply and demand index Gxzs and the cruise data group Xhsj according to the operation data set, the load data set and the standard data. The calculation process is as follows: According to the overload protection instruction, the load data set is filtered and the load data set that exceeds the rated load standard BZ is counted. fh The real-time received load demand or the real-time predicted upcoming load demand is denoted as C F ; According to the load data set and the standard data set, the cruise data set Xhsj is calculated and generated; Xhsj=C F -BZ yx In the formula, Xhsj represents the cruise data group, C F -BZ yx Indicates the difference between the actual load data and the rated load standard data when the current load demand exceeds the rated load range, and obtains a cruise data group containing specific frequency modulation parameters; Calculate and generate the supply and demand index Gxzs based on the operation data set, load data set and standard data set; In the formula, Gxzs represents the supply and demand index, and α represents the fixed parameter used in the supply and demand index calculation formula to convert the thermal power unit operation data into power supply. It indicates the maximum value of the total power supply of the thermal power unit after the operation data is adjusted upward according to the cruise data group Xhsj, Fn g+y It represents the actual load demand obtained by summing the load demand received in real time from the load data set and the load fluctuation predicted in real time. It represents the ratio of the maximum total power supply of the thermal power units to the actual load demand after the operating data is adjusted upward according to the cruise data group Xhsj, that is, the supply and demand index representing the supply and demand relationship between the thermal power units and the load.

8. The automatic cruise system for wide load operation of thermal power units according to claim 7, characterized in that: After receiving the safety compliance instruction, the cruise analysis module calculates and generates the supply and demand index Gxzs according to the operation data set and the load data set. The calculation process is as follows: In the formula, Gxzs represents the supply and demand index, and α represents the fixed parameter used in the supply and demand index calculation formula to convert the thermal power unit operation data into power supply. It represents the actual power supply obtained by converting the operating data of the thermal power units in the operating data set. g+y It represents the actual load demand obtained by summing the load demand received in real time from the load data set and the load fluctuation predicted in real time. It represents the ratio of the actual power supply of thermal power units to the actual load demand, that is, the supply and demand index that represents the supply and demand relationship between thermal power units and loads.

9. The automatic cruise system for wide load operation of thermal power units according to claim 8, characterized in that: The intelligent control module decides to use the peak-shaving and frequency regulation scheme of the dry-state deep-shaving load segment of the unit according to the supply-demand index Gxzs when the thermal power unit is in an overload state, and the AGC coordinated control system performs peak-shaving and frequency regulation operations according to the cruise data group Xhsj when the thermal power unit is in an overload state. The intelligent control module decides to use the peak-shaving and frequency regulation scheme of the normal peak-shaving load segment according to the supply-demand index Gxzs when the real-time load demand exceeds the rated load range, and the AGC coordinated control system performs peak-shaving and frequency regulation operations according to the cruise data group Xhsj when the thermal power unit is in an overload state. If the supply-demand index Gxzs is calculated and generated by the cruise analysis module after receiving the safety and compliance instruction, the intelligent control module decides to use the peak-shaving and frequency regulation scheme of the unit's dry-wet conversion load segment and the unit's wet deep-shaving load segment, and maintains the combustion stability of the thermal power unit through the AGC coordinated control system.

10. The automatic cruise system for wide load operation of thermal power units according to claim 5, characterized in that: After receiving the danger alarm instruction, the intelligent control module executes safety protection measures through the AGC coordination control system to cut off power to protect the thermal power unit and the load sensor.

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