Method and device for limiting amplitude of primary frequency modulation of thermal power unit

Abstract

The application provides a thermal power unit primary frequency modulation limiting method and device, and relates to the technical field of unit frequency modulation.The method comprises the following steps: judging whether the current power of the thermal power unit is greater than or equal to the rated power of the unit, if yes, taking a preset safety setting value as a frequency modulation power setting value, if no, obtaining the frequency modulation power setting value according to the slip of the thermal power unit, obtaining a current valve opening degree increment according to the frequency modulation power setting value, the rated power of the unit and the current power of the unit, and obtaining a target valve opening degree increment according to the current valve opening degree increment and a comprehensive valve opening degree increment determined based on the slip of the thermal power unit.The application can limit the increase range of the power supply of the thermal power unit after primary frequency modulation within the safety range specified in the relevant regulations, thereby reducing the possibility of overloading operation of the thermal power unit, and further improving the safety of power supply of the thermal power unit.

Description

Technical Field

[0001] This invention relates to the field of frequency regulation technology for power generation units, and in particular to a method and apparatus for limiting the primary frequency regulation of thermal power units. Background Technology

[0002] Primary frequency regulation of thermal power units is an important means to improve the stability of the power supply frequency of thermal power units, thereby better meeting the large power supply demand of today's society. However, the following safety regulations apply to primary frequency regulation of thermal power units:

[0003] For safety reasons, when the unit is operating at its rated power, the increase in power supply after a primary frequency regulation should not exceed 6% of the unit's rated power.

[0004] Existing technologies lack methods for limiting the primary frequency regulation of thermal power units, which makes it highly likely that the increase in power supply after frequency regulation will exceed the safety limits stipulated by safety regulations, thus jeopardizing the power supply safety of thermal power units. Summary of the Invention

[0005] One object of this invention is to provide a primary frequency regulation limiting method for thermal power units, addressing the problem that the increase in power supply from thermal power units after primary frequency regulation is likely to exceed the safety limits stipulated in safety regulations, thus jeopardizing the power supply safety of thermal power units. Another object of this invention is to provide a primary frequency regulation limiting device for thermal power units. A further object of this invention is to provide a computer device. A still other object of this invention is to provide a readable medium.

[0006] To achieve the above objectives, one aspect of the present invention discloses a method for primary frequency regulation limiting of a thermal power unit, the method comprising:

[0007] Determine whether the current power of the thermal power unit is greater than or equal to the rated power of the unit. If so, use the preset safety setting value as the frequency regulation power setting value; otherwise, obtain the frequency regulation power setting value based on the slip of the thermal power unit.

[0008] The current valve position opening increment is obtained based on the frequency regulation power setting, the rated power of the unit, and the current power of the unit;

[0009] The target valve position opening increment is obtained based on the current valve position opening increment and the comprehensive valve position increment determined based on the slip of the thermal power unit.

[0010] Optionally, before determining whether the current power of the thermal power unit is greater than or equal to the rated power of the unit, the process further includes:

[0011] The safety setpoint is obtained based on the rated power of the unit and the first limiting factor.

[0012] Optionally, obtaining the safety setpoint based on the unit's rated power and the first limiting factor includes:

[0013] The rated power of the unit is multiplied by the first limiting coefficient to obtain the safety set value.

[0014] Optionally, obtaining the frequency regulation power setting based on the slip of the thermal power unit includes:

[0015] The slip of the thermal power unit is input into a first preset inequality function to obtain the frequency regulation power setpoint.

[0016] Optionally, obtaining the current valve position opening increment based on the frequency regulation power setting, the unit's rated power, and the unit's current power includes:

[0017] The target power of the unit is obtained based on the rated power of the unit and the frequency regulation power setting.

[0018] The required increase in power output of the unit is obtained based on the target power output and the current power output of the unit.

[0019] The incremental valve opening is obtained by performing PID processing on the increased power demand of the unit.

[0020] Optionally, obtaining the target power of the unit based on the rated power of the unit and the frequency regulation power setting includes:

[0021] The target power of the unit is obtained by adding the rated power of the unit to the frequency regulation power setting.

[0022] Optionally, obtaining the increased power demand of the unit based on the target power of the unit and the current power of the unit includes:

[0023] The increased power requirement of the unit is obtained by subtracting the current power of the unit from the target power of the unit.

[0024] Optionally, obtaining the target valve position opening increment based on the current valve position opening increment and the comprehensive valve position increment determined based on the slip of the thermal power unit includes:

[0025] The target valve position opening increment is obtained by adding the current valve position opening increment to the comprehensive valve position increment determined based on the slip of the thermal power unit.

[0026] Optionally, before obtaining the target valve position opening increment based on the current valve position opening increment and the comprehensive valve position increment determined based on the slip of the thermal power unit, the method further includes:

[0027] When the current power of the thermal power unit is greater than or equal to the rated power of the unit, a preset valve position increment is obtained based on the slip of the thermal power unit;

[0028] The comprehensive valve position increment is obtained based on the unit's rated power, the preset valve position increment, and the second limiting coefficient.

[0029] When the current power of the thermal power unit is less than the rated power of the unit, the comprehensive valve position increment is obtained based on the slip of the thermal power unit.

[0030] Optionally, obtaining the comprehensive valve position increment based on the unit's rated power, the preset valve position increment, and the second limiting coefficient includes:

[0031] Determine whether the rated power of the unit is within a first preset power range or a second preset power range. If it is within the first preset power range, then the second limiting coefficient is the first sub-limiting coefficient. The comprehensive valve position increment is obtained based on the first sub-limiting coefficient and the preset valve position increment.

[0032] If it is within the second power preset range, then the second limiting coefficient is the second sub-limiting coefficient, and the comprehensive valve position increment is obtained according to the second sub-limiting coefficient and the preset valve position increment;

[0033] Wherein, the minimum value of the first preset power range is greater than or equal to the maximum value of the second preset power range, and the first preset power range and the second preset power range do not intersect; the first sub-limiting coefficient is greater than the second sub-limiting coefficient.

[0034] Optionally, obtaining the comprehensive valve position increment based on the first sub-limiting coefficient and the preset valve position increment includes:

[0035] The first sub-limiting coefficient is multiplied by the preset valve position increment to obtain the comprehensive valve position increment.

[0036] Optionally, obtaining the comprehensive valve position increment based on the second sub-limiting coefficient and the preset valve position increment includes:

[0037] The second sub-limiting coefficient is multiplied by the preset valve position increment to obtain the comprehensive valve position increment.

[0038] To achieve the above objectives, another aspect of the present invention discloses a primary frequency regulation limiting device for thermal power units, the device comprising:

[0039] The frequency regulation power setpoint determination module is used to determine whether the current power of the thermal power unit is greater than or equal to the rated power of the unit. If so, the preset safety setpoint is used as the frequency regulation power setpoint; otherwise, the frequency regulation power setpoint is obtained based on the slip of the thermal power unit.

[0040] The current valve position opening increment determination module is used to obtain the current valve position opening increment based on the frequency regulation power setting, the rated power of the unit, and the current power of the unit;

[0041] The target valve position opening increment determination module is used to obtain the target valve position opening increment based on the current valve position opening increment and the comprehensive valve position increment determined based on the slip of the thermal power unit.

[0042] The present invention also discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method described above.

[0043] The present invention also discloses a computer-readable medium having a computer program stored thereon, which, when executed by a processor, implements the method described above.

[0044] The present invention provides a method and apparatus for limiting the primary frequency regulation of thermal power units. By determining whether the current power of the thermal power unit is greater than or equal to its rated power, if so, a preset safety setpoint is used as the frequency regulation power setpoint; otherwise, the frequency regulation power setpoint is obtained based on the slip of the thermal power unit. When the current power of the thermal power unit is greater than or equal to its rated power, the coordinated control system of the thermal power unit uses the safety setpoint as the frequency regulation power setpoint to better coordinate and control the power supply of the thermal power unit, thereby strengthening the limiting effect of primary frequency regulation. When the current power of the thermal power unit is less than its rated power, the coordinated control system (CCS) generates the frequency regulation power setpoint according to the existing primary frequency regulation method, ensuring that the power supply of the thermal power unit meets the relevant requirements. By obtaining the current valve opening increment based on the frequency regulation power setpoint, the rated power of the unit, and the current power of the unit, it is possible to combine the current... The operating conditions of the thermal power unit, the target power supply of the thermal power unit after primary frequency regulation, and the requirements of relevant safety regulations are used to obtain a more suitable current valve position opening increment. This prepares for improving the rationality of the target valve position opening increment obtained in subsequent steps. By obtaining the target valve position opening increment based on the current valve position opening increment and the comprehensive valve position increment determined based on the slip of the thermal power unit, the rationality of the target valve position opening increment can be further improved by combining the adjustment of the valve position opening by the digital electro-hydraulic control system (DEH) of the thermal power unit. Thus, by providing a reasonable target valve position opening increment, the thermal power unit can reasonably adjust the valve position opening of the unit according to the target valve position opening increment, thereby effectively controlling the steam intake of the thermal power unit. This ensures that the power supply of the thermal power unit after primary frequency regulation can meet the relevant requirements while limiting the increase in power supply of the thermal power unit within the safe range specified by relevant regulations. In summary, the primary frequency regulation limiting method and apparatus for thermal power units provided by the present invention can limit the increase in power supply of thermal power units after primary frequency regulation to within the safe range specified in relevant regulations, thereby reducing the possibility of overload operation of thermal power units and improving the safety of power supply of thermal power units. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 A flowchart illustrating a primary frequency regulation limiting method for thermal power units according to an embodiment of the present invention is shown.

[0047] Figure 2 A schematic diagram illustrating an optional step in obtaining the security setting according to an embodiment of the present invention is shown;

[0048] Figure 3 A schematic diagram illustrating an optional step in obtaining the current valve position opening increment according to an embodiment of the present invention is shown.

[0049] Figure 4 A schematic diagram illustrating an optional step in obtaining the overall valve position increment according to an embodiment of the present invention is shown;

[0050] Figure 5 A schematic diagram illustrating another optional step in obtaining the overall valve position increment according to an embodiment of the present invention is shown;

[0051] Figure 6 A schematic diagram of a primary frequency regulation limiting device for a thermal power unit according to an embodiment of the present invention is shown;

[0052] Figure 7 A schematic diagram of a computer device suitable for implementing embodiments of the present invention is shown. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] The terms "first," "second," etc., used in this document do not specifically refer to any order or sequence, nor are they intended to limit the invention; they are merely used to distinguish elements or operations described using the same technical terms.

[0055] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0056] The term "and / or" as used herein includes any or all of the things mentioned.

[0057] It should be noted that the acquisition, storage, use, and processing of data in the technical solution of this invention all comply with the relevant provisions of national laws and regulations.

[0058] This invention discloses a method for determining distributed photovoltaic power, such as... Figure 1 As shown, the method specifically includes the following steps:

[0059] S101: Determine whether the current power of the thermal power unit is greater than or equal to the rated power of the unit. If yes, use the preset safety setting value as the frequency regulation power setting value; otherwise, obtain the frequency regulation power setting value based on the slip of the thermal power unit.

[0060] S102: Based on the frequency regulation power setting, the rated power of the unit, and the current power of the unit, obtain the current valve position opening increment.

[0061] S103: The target valve position opening increment is obtained based on the current valve position opening increment and the comprehensive valve position increment determined based on the slip of the thermal power unit.

[0062] The present invention provides a method and apparatus for limiting the primary frequency regulation of thermal power units. By determining whether the current power of the thermal power unit is greater than or equal to its rated power, if so, a preset safety setpoint is used as the frequency regulation power setpoint; otherwise, the frequency regulation power setpoint is obtained based on the slip of the thermal power unit. When the current power of the thermal power unit is greater than or equal to its rated power, the coordinated control system of the thermal power unit uses the safety setpoint as the frequency regulation power setpoint to better coordinate and control the power supply of the thermal power unit, thereby strengthening the limiting effect of primary frequency regulation. When the current power of the thermal power unit is less than its rated power, the coordinated control system (CCS) generates the frequency regulation power setpoint according to the existing primary frequency regulation method, ensuring that the power supply of the thermal power unit meets the relevant requirements. By obtaining the current valve opening increment based on the frequency regulation power setpoint, the rated power of the unit, and the current power of the unit, it is possible to combine the current... The operating conditions of the thermal power unit, the target power supply of the thermal power unit after primary frequency regulation, and the requirements of relevant safety regulations are used to obtain a more suitable current valve position opening increment. This prepares for improving the rationality of the target valve position opening increment obtained in subsequent steps. By obtaining the target valve position opening increment based on the current valve position opening increment and the comprehensive valve position increment determined based on the slip of the thermal power unit, the rationality of the target valve position opening increment can be further improved by combining the adjustment of the valve position opening by the digital electro-hydraulic control system (DEH) of the thermal power unit. Thus, by providing a reasonable target valve position opening increment, the thermal power unit can reasonably adjust the valve position opening of the unit according to the target valve position opening increment, thereby effectively controlling the steam intake of the thermal power unit. This ensures that the power supply of the thermal power unit after primary frequency regulation can meet the relevant requirements while limiting the increase in power supply of the thermal power unit within the safe range specified by relevant regulations. In summary, the primary frequency regulation limiting method and apparatus for thermal power units provided by the present invention can limit the increase in power supply of thermal power units after primary frequency regulation to within the safe range specified in relevant regulations, thereby reducing the possibility of overload operation of thermal power units and improving the safety of power supply of thermal power units.

[0063] In an optional implementation, before determining whether the current power of the thermal power unit is greater than or equal to the rated power of the unit, the method further includes:

[0064] The safety setpoint is obtained based on the rated power of the unit and the first limiting factor.

[0065] For example, the rated power of the unit can be obtained from the system setting log, configuration file, and relevant parameter files of the thermal power unit. It should be noted that the specific method for obtaining the rated power of the unit can be determined by those skilled in the art based on actual circumstances; the above description is merely an example and does not constitute a limitation.

[0066] For example, the first limiting coefficient should be determined in conjunction with the relevant safety regulations for primary frequency regulation of thermal power units, and may be set to, but is not limited to, 6%. It should be noted that the determination of the first limiting coefficient can be made by those skilled in the art based on the actual situation, and the above description is only an example and does not constitute a limitation.

[0067] By obtaining the safety setpoint based on the rated power of the unit and the first limiting coefficient, the obtained safety setpoint is set based on the safety regulations for primary frequency regulation of thermal power units. This makes it more likely that the increase in the power supply of the thermal power unit will be within a safe range after the primary frequency regulation of the thermal power unit is limited in subsequent steps.

[0068] In one alternative implementation, such as Figure 2 As shown, obtaining the safety setpoint based on the unit's rated power and the first limiting factor includes the following steps:

[0069] S201: Multiply the rated power of the unit by the first limiting coefficient to obtain the safety set value.

[0070] By multiplying the rated power of the unit by the first limiting coefficient to obtain the safety setting value, the obtained safety setting value can be more correlated with the safety regulations for primary frequency regulation of thermal power units, thereby further increasing the possibility that the increase in the power supply of thermal power units will be within the safe range after limiting the primary frequency regulation of thermal power units in subsequent steps.

[0071] In an optional implementation, obtaining the frequency regulation power setting based on the slip of the thermal power unit includes:

[0072] The slip of the thermal power unit is input into a first preset inequality function to obtain the frequency regulation power setpoint.

[0073] For example, the first preset inequality function can be designed and confirmed by those skilled in the art based on the specific operating conditions and parameter settings of the actual thermal power unit, or it can be designed as a function that determines the frequency regulation power setpoint by calculating the speed inequality. It should be noted that inputting the slip of the thermal power unit into the first preset inequality function to obtain the frequency regulation power setpoint is a conventional technique in the art and will not be elaborated here. The determination of the first preset inequality function is also a conventional technique in the art.

[0074] By inputting the slip of the thermal power unit into a first preset inequality function, the frequency regulation power setpoint is obtained. This enables the thermal power unit to meet relevant requirements when the current power of the unit is less than the rated power of the unit, reducing the possibility of insufficient power supply caused by grid frequency disturbances. This is a commonly used technical means in existing thermal power unit primary frequency regulation methods.

[0075] In one alternative implementation, such as Figure 3 As shown, obtaining the current valve position opening increment based on the frequency regulation power setting, the unit's rated power, and the unit's current power includes the following steps:

[0076] S301: The target power of the unit is obtained based on the rated power of the unit and the frequency regulation power setting.

[0077] S302: Based on the target power of the unit and the current power of the unit, obtain the increased power demand of the unit.

[0078] S303: Perform PID processing on the increased power demand of the unit to obtain the current valve opening increment.

[0079] PID control is a fundamental regulation method in classical control theory, and it is a linear regulation law with proportional, integral and derivative actions.

[0080] For example, the PID processing involves using a power controller to apply PID control to the increased power demand of the generator unit to obtain the current valve opening increment. The power controller can be selected by those skilled in the art based on actual conditions. It should be noted that applying PID control to the increased power demand of the generator unit to obtain the current valve opening increment is a conventional technique in the field and will not be elaborated upon here.

[0081] By obtaining the target power of the unit based on the rated power of the unit and the frequency regulation power setting, the target power of the unit can be ensured to meet both the power supply requirements and the safety range not exceeding the relevant safety regulations.

[0082] By obtaining the unit's required power increase based on the unit's target power and current power, the amount of power increase the unit needs to provide can be determined by combining the unit's current power supply situation and power supply target.

[0083] By applying PID processing to the increased power demand of the unit to obtain the current valve opening increment, even after the digital electro-hydraulic control system (DEH) of the thermal power unit has already made preliminary adjustments to the valve opening, a reasonable current valve opening increment can be provided based on the determined amount of power supply increase required by the unit. This allows the thermal power unit to make reasonable adjustments to the unit's valve opening in subsequent steps based on the target valve opening increment determined by the current valve opening increment and the comprehensive valve opening increment. The current valve opening increment refers to the amount of valve opening that needs to be increased further after the DEH system of the thermal power unit has made preliminary adjustments. In the existing primary frequency regulation and the primary frequency regulation scenario of this invention, the DEH system plays a role in making preliminary but rapid adjustments to the valve opening of the thermal power unit during frequency regulation. However, due to limitations in rapid response requirements and safety considerations, the overall valve position increment provided by the DEH system is often quite conservative. Simply adding the overall valve position increment to the current valve position increment of the thermal power unit is insufficient to ensure that the power output of the thermal power unit according to the added valve position increment meets the vast electricity demand. Therefore, it is necessary to obtain the current valve position increment based on the frequency regulation power setting, the rated power of the unit, and the current power of the unit. In the primary frequency regulation scenario of the present invention, the specific method for obtaining the current valve position increment is often implemented in the CCS system of the thermal power unit.

[0084] In an optional implementation, obtaining the target power of the unit based on the rated power of the unit and the frequency regulation power setting includes:

[0085] The target power of the unit is obtained by adding the rated power of the unit to the frequency regulation power setting.

[0086] By adding the rated power of the generator set to the frequency regulation power setting, the target power of the generator set can be obtained, which makes the obtained target power of the generator set more consistent with the power supply demand.

[0087] In an optional implementation, obtaining the unit's required power increase based on the unit's target power and the unit's current power includes:

[0088] The increased power requirement of the unit is obtained by subtracting the current power of the unit from the target power of the unit.

[0089] By subtracting the current power of the unit from the target power of the unit, the increased power demand of the unit can be obtained, ensuring that the increased power demand of the unit is consistent with the difference between the current power supply situation and the power supply target.

[0090] In an optional implementation, obtaining the target valve position opening increment based on the current valve position opening increment and the comprehensive valve position increment determined based on the slip of the thermal power unit includes:

[0091] The target valve position opening increment is obtained by adding the current valve position opening increment to the comprehensive valve position increment determined based on the slip of the thermal power unit.

[0092] By adding the current valve position opening increment to the comprehensive valve position increment determined based on the slip of the thermal power unit, the target valve position opening increment can be obtained. This allows for the addition of the valve position opening amount needed after the DEH system has already made initial adjustments to the valve position opening of the thermal power unit. This, combined with the comprehensive valve position increment from the DEH system's initial valve position adjustment, results in the target valve position opening increment, thereby further improving the rationality of the target valve position opening increment. The target valve position opening increment is superimposed on the current valve position opening of the thermal power unit to obtain a final valve position opening. This ensures that the thermal power unit sets the valve position to the final valve position opening, thereby better controlling the steam intake of the thermal power unit. This limits the increase in the power supply of the thermal power unit after primary frequency regulation to within the safe range specified by relevant regulations, while ensuring that the power supply capacity of the thermal power unit meets relevant requirements. The valve position refers to the valve position of the steam intake valve required by the thermal power unit.

[0093] In an optional implementation, before obtaining the target valve position opening increment based on the current valve position opening increment and the combined valve position increment determined based on the slip of the thermal power unit, the method further includes:

[0094] When the current power of the thermal power unit is greater than or equal to the rated power of the unit, a preset valve position increment is obtained based on the slip of the thermal power unit;

[0095] The comprehensive valve position increment is obtained based on the rated power of the unit, the preset valve position increment, and the second limiting coefficient.

[0096] When the current power of the thermal power unit is less than the rated power of the unit, the comprehensive valve position increment is obtained based on the slip of the thermal power unit.

[0097] For example, the slip of the thermal power unit can be obtained by accessing the system operation information of the thermal power unit. The method for obtaining the slip of the thermal power unit can be determined by those skilled in the art based on the actual situation. The above description is only an example and does not constitute a limitation.

[0098] For example, obtaining the preset valve position increment based on the slip of the thermal power unit can be achieved by inputting the slip into a preset DEH inequality function and taking the output of the inequality function as the preset valve position increment. It should be noted that the specific implementation of obtaining the preset valve position increment based on the slip of the thermal power unit can be determined by those skilled in the art based on actual conditions; the above description is merely an example and does not constitute a limitation. The DEH inequality function can be designed and confirmed by those skilled in the art based on the specific operating conditions and parameter settings of the actual thermal power unit, or it can be designed as a function that calculates the speed inequality and then determines the preset valve position increment corresponding to the speed inequality. Determining the DEH inequality function is a conventional technique in the art. The value of the preset valve position increment can be, but is not limited to, 8% or 6%.

[0099] For example, obtaining the comprehensive valve position increment based on the slip of the thermal power unit can be achieved by inputting the slip into a preset DEH inequality function and taking the output of the inequality function as the comprehensive valve position increment. It should be noted that the specific implementation method for obtaining the comprehensive valve position increment based on the slip of the thermal power unit can be determined by those skilled in the art based on actual conditions; the above description is merely an example and does not constitute a limitation. As for the DEH inequality function, it can be designed and confirmed by those skilled in the art based on the specific operating conditions and parameter settings of the actual thermal power unit, or it can be designed as a function that calculates the speed inequality and then determines the comprehensive valve position increment corresponding to the speed inequality. The determination of the DEH inequality function is a conventional technical method in this field.

[0100] By obtaining a preset valve position increment based on the slip of the thermal power unit when the current power of the unit is greater than or equal to the rated power of the unit, and obtaining a comprehensive valve position increment based on the rated power of the unit, the preset valve position increment, and the second limiting coefficient, it is possible to limit the comprehensive valve position increment output by the DEH system of the thermal power unit in primary frequency regulation when the current power of the unit is greater than or equal to the rated power of the unit. This further improves the limiting effect of primary frequency regulation in thermal power units, thereby improving the operational safety of thermal power units.

[0101] By obtaining the comprehensive valve position increment based on the slip of the thermal power unit when the current power of the unit is less than the rated power, the comprehensive valve position increment can be output using the existing primary frequency regulation method of thermal power units when the current power of the unit is less than the rated power, so that the target valve position increment output in subsequent steps can meet the relevant power supply requirements.

[0102] In an optional implementation, obtaining the comprehensive valve position increment based on the unit's rated power, a preset valve position increment, and a second limiting coefficient includes:

[0103] Determine whether the rated power of the unit is within a first preset power range or a second preset power range. If it is within the first preset power range, then the second limiting coefficient is the first sub-limiting coefficient. The comprehensive valve position increment is obtained based on the first sub-limiting coefficient and the preset valve position increment.

[0104] If it is within the second power preset range, then the second limiting coefficient is the second sub-limiting coefficient, and the comprehensive valve position increment is obtained according to the second sub-limiting coefficient and the preset valve position increment;

[0105] Wherein, the minimum value of the first preset power range is greater than or equal to the maximum value of the second preset power range, and the first preset power range and the second preset power range do not intersect; the first sub-limiting coefficient is greater than the second sub-limiting coefficient.

[0106] For example, the second limiting coefficient includes a first sub-limiting coefficient and a second sub-limiting coefficient, and the second limiting coefficient can be a combination of some coefficients. For example, the second limiting coefficient is {0.75, 0.6}, while the first sub-limiting coefficient is 0.75 and the second sub-limiting coefficient is 0.6. It should be noted that the second limiting coefficient, the first sub-limiting coefficient, and the second sub-limiting coefficient can be determined by those skilled in the art according to the actual situation, but it must satisfy the condition that "the first sub-limiting coefficient is greater than the second sub-limiting coefficient". The above description is only an example and does not constitute a limitation.

[0107] For example, the first preset power range can be, but is not limited to, [350MW, 500MW], and the second preset power range can be, but is not limited to, [0MW, 350MW]. It should be noted that the first preset power range and the second preset power range can be determined by those skilled in the art based on the actual situation, but must satisfy the condition that "the minimum value of the first preset power range is greater than or equal to the maximum value of the second preset power range, and the first preset power range and the second preset power range do not intersect". The above description is only an example and does not constitute a limitation.

[0108] By determining whether the rated power of the unit falls within a first preset power range or a second preset power range, if it falls within the first preset power range, the second limiting coefficient becomes the first sub-limiting coefficient. The comprehensive valve position increment is obtained based on the first sub-limiting coefficient and the preset valve position increment. If it falls within the second preset power range, the second limiting coefficient becomes the second sub-limiting coefficient. The comprehensive valve position increment is obtained based on the second sub-limiting coefficient and the preset valve position increment. This allows for different limiting forces to be applied to thermal power units with different rated power. When the rated power of the unit falls within the first preset power range, it indicates a larger rated power and relatively stronger tolerance. Therefore, a larger first sub-limiting coefficient can be used to limit the output comprehensive valve position increment, resulting in a relatively weaker limiting force. In balancing the limiting forces, the preference is placed on ensuring that the unit's output power meets the power supply requirements. When the rated power of the unit is within the second preset power range, it indicates that the rated power of the unit is relatively small and the unit's tolerance is relatively weak. Therefore, a smaller second sub-limiting coefficient can be used to limit the output comprehensive valve position increment, resulting in a relatively strong limiting force. In the balance of limiting, it tends to reduce the possibility of unit overload operation, thereby improving the safety of unit operation.

[0109] In one alternative implementation, such as Figure 4 As shown, obtaining the comprehensive valve position increment based on the first sub-limiting coefficient and the preset valve position increment includes the following steps:

[0110] S401: Multiply the first sub-limiting coefficient by the preset valve position increment to obtain the comprehensive valve position increment.

[0111] By multiplying the first sub-limiting coefficient by the preset valve position increment to obtain the comprehensive valve position increment, the comprehensive valve position increment of the output can be more effectively limited by the first sub-limiting coefficient when the rated power of the unit is within the first preset power range.

[0112] In one alternative implementation, such as Figure 5 As shown, obtaining the comprehensive valve position increment based on the second sub-limiting coefficient and the preset valve position increment includes the following steps:

[0113] S501: Multiply the second sub-limiting coefficient by the preset valve position increment to obtain the comprehensive valve position increment.

[0114] By multiplying the second sub-limiting coefficient by the preset valve position increment to obtain the comprehensive valve position increment, the comprehensive valve position increment of the output can be more effectively limited by the second sub-limiting coefficient when the rated power of the unit is within the second preset power range.

[0115] In a preferred embodiment, before obtaining the frequency regulation power setting based on the slip of the thermal power unit, the method further includes:

[0116] If the duration of the current power of the unit being less than the rated power of the unit is greater than or equal to the delay threshold, then the step of obtaining the frequency regulation power setting value based on the slip of the thermal power unit is not executed; instead, the step of using the preset safety setting value as the frequency regulation power setting value is executed.

[0117] For example, the delay threshold can be, but is not limited to, 3 seconds or 2 seconds. It should be noted that the delay threshold can be determined by those skilled in the art based on actual circumstances; the above description is merely an example and does not constitute a limitation.

[0118] By determining whether the duration of the state where the unit's current power is less than the unit's rated power is greater than or equal to a delay threshold, if not, the step of obtaining the frequency regulation power setting based on the slip of the thermal power unit is not executed. Instead, the step of using the preset safety setting as the frequency regulation power setting is executed. This ensures that when the unit changes from a state where the unit's current power is greater than or equal to the unit's rated power to a state where the unit's current power is less than the unit's rated power, the operation of limiting the primary frequency regulation of the thermal power unit by limiting the frequency regulation power setting will not be terminated immediately. Instead, it will be terminated after waiting for the duration of the delay threshold. This reduces the probability of additional disturbances to the unit's power supply circuit caused by the frequent changes in the state of the limiting operation and the frequent changes in the unit's power state. It also further improves the safety of the thermal power unit's power supply by increasing the time of limiting the primary frequency regulation of the thermal power unit by limiting the frequency regulation power setting.

[0119] In a preferred embodiment, before obtaining the comprehensive valve position increment based on the slip of the thermal power unit, the method further includes:

[0120] If the duration of the current power of the unit being less than the rated power of the unit is greater than or equal to the delay threshold, then the step of obtaining the comprehensive valve position increment based on the slip of the thermal power unit is not executed; instead, the step of obtaining the preset valve position increment based on the slip of the thermal power unit, and obtaining the comprehensive valve position increment based on the rated power of the unit, the preset valve position increment, and the second limiting coefficient is executed.

[0121] For example, the delay threshold can be, but is not limited to, 3 seconds or 2 seconds. It should be noted that the delay threshold can be determined by those skilled in the art based on actual circumstances; the above description is merely an example and does not constitute a limitation.

[0122] By determining whether the duration of the state where the current power of the unit is less than the rated power of the unit is greater than or equal to a delay threshold, if not, the step of obtaining the comprehensive valve position increment based on the slip of the thermal power unit is not executed; instead, the step of obtaining the preset valve position increment based on the slip of the thermal power unit, and obtaining the comprehensive valve position increment based on the rated power of the unit, the preset valve position increment, and the second limiting coefficient is executed. This ensures that when the state of the unit changes from a state where the current power of the unit is greater than or equal to the rated power of the unit to a state where the current power of the unit is less than the rated power of the unit, the operation of limiting the primary frequency regulation of the thermal power unit by limiting the comprehensive valve position increment will not be terminated immediately, but will be terminated after waiting for the duration of the delay threshold. This reduces the probability of additional disturbances to the power supply circuit of the unit caused by the frequent changes in the state of the limiting operation and the frequent changes in the power state of the unit. It also further improves the safety of the power supply of the thermal power unit by increasing the time of limiting the primary frequency regulation of the thermal power unit by limiting the comprehensive valve position increment.

[0123] Based on the same principle, this invention discloses a primary frequency regulation limiting device 600 for thermal power units, such as... Figure 6 As shown, the primary frequency regulation limiting device 600 of the thermal power unit includes:

[0124] The frequency regulation power setpoint determination module 601 is used to determine whether the current power of the thermal power unit is greater than or equal to the rated power of the unit. If so, the preset safety setpoint is used as the frequency regulation power setpoint; otherwise, the frequency regulation power setpoint is obtained based on the slip of the thermal power unit.

[0125] The current valve position opening increment determination module 602 is used to obtain the current valve position opening increment based on the frequency regulation power setting, the rated power of the unit, and the current power of the unit;

[0126] The target valve position opening increment determination module 603 is used to obtain the target valve position opening increment based on the current valve position opening increment and the comprehensive valve position increment determined based on the slip of the thermal power unit.

[0127] In an optional implementation, a safety setting determination module is further included, for:

[0128] The safety setpoint is obtained based on the rated power of the unit and the first limiting factor.

[0129] In an optional implementation, the safety setting determination module is used to:

[0130] The rated power of the unit is multiplied by the first limiting coefficient to obtain the safety set value.

[0131] In an optional implementation, the frequency modulation power setpoint determination module 601 is used for:

[0132] The slip of the thermal power unit is input into a first preset inequality function to obtain the frequency regulation power setpoint.

[0133] In an optional implementation, the current valve position opening increment determination module 602 is used for:

[0134] The target power of the unit is obtained based on the rated power of the unit and the frequency regulation power setting.

[0135] The required increase in power output of the unit is obtained based on the target power output and the current power output of the unit.

[0136] The incremental valve opening is obtained by performing PID processing on the increased power demand of the unit.

[0137] In an optional implementation, the current valve position opening increment determination module 602 is used for:

[0138] The target power of the unit is obtained by adding the rated power of the unit to the frequency regulation power setting.

[0139] In an optional implementation, the current valve position opening increment determination module 602 is used for:

[0140] The increased power requirement of the unit is obtained by subtracting the current power of the unit from the target power of the unit.

[0141] In an optional implementation, the target valve position opening increment determination module 603 is used for:

[0142] The target valve position opening increment is obtained by adding the current valve position opening increment to the comprehensive valve position increment determined based on the slip of the thermal power unit.

[0143] In an optional implementation, a comprehensive valve position increment determination module is also included, for:

[0144] When the current power of the thermal power unit is greater than or equal to the rated power of the unit, a preset valve position increment is obtained based on the slip of the thermal power unit;

[0145] The comprehensive valve position increment is obtained based on the rated power of the unit, the preset valve position increment, and the second limiting coefficient.

[0146] When the current power of the thermal power unit is less than the rated power of the unit, the comprehensive valve position increment is obtained based on the slip of the thermal power unit.

[0147] In an optional implementation, the integrated valve position increment determination module is used for:

[0148] Determine whether the rated power of the unit is within a first preset power range or a second preset power range. If it is within the first preset power range, then the second limiting coefficient is the first sub-limiting coefficient. The comprehensive valve position increment is obtained based on the first sub-limiting coefficient and the preset valve position increment.

[0149] If it is within the second power preset range, then the second limiting coefficient is the second sub-limiting coefficient, and the comprehensive valve position increment is obtained according to the second sub-limiting coefficient and the preset valve position increment;

[0150] Wherein, the minimum value of the first preset power range is greater than or equal to the maximum value of the second preset power range, and the first preset power range and the second preset power range do not intersect; the first sub-limiting coefficient is greater than the second sub-limiting coefficient.

[0151] In an optional implementation, the integrated valve position increment determination module is used for:

[0152] The first sub-limiting coefficient is multiplied by the preset valve position increment to obtain the comprehensive valve position increment.

[0153] In an optional implementation, the integrated valve position increment determination module is used for:

[0154] The second sub-limiting coefficient is multiplied by the preset valve position increment to obtain the comprehensive valve position increment.

[0155] Since the principle of the primary frequency regulation limiting device 600 of this thermal power unit is similar to the above method, the implementation of the primary frequency regulation limiting device 600 of this thermal power unit can refer to the implementation of the above method, and will not be repeated here.

[0156] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer device, specifically, a computer device can be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or any combination of these devices.

[0157] In a typical example, a computer device specifically includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the method described above.

[0158] The following is for reference. Figure 7 It shows a schematic diagram of the structure of a computer device 700 suitable for implementing the embodiments of this application.

[0159] like Figure 7 As shown, the computer device 700 includes a central processing unit (CPU) 701, which can perform various appropriate tasks and processes based on programs stored in read-only memory (ROM) 702 or programs loaded from storage section 708 into random access memory (RAM) 703. The RAM 703 also stores various programs and data required for the operation of the system 700. The CPU 701, ROM 702, and RAM 703 are interconnected via a bus 704. An input / output (I / O) interface 705 is also connected to the bus 704.

[0160] The following components are connected to the I / O interface 705: an input section 706 including a keyboard, mouse, etc.; an output section 707 including a cathode ray tube (CRT), liquid crystal feedback (LCD), etc., and speakers, etc.; a storage section 708 including a hard disk, etc.; and a communication section 709 including a network interface card such as a LAN card, modem, etc. The communication section 709 performs communication processing via a network such as the Internet. A drive 710 is also connected to the I / O interface 705 as needed. A removable medium 711, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 710 as needed so that computer programs read from it can be installed in the storage section 708 as needed.

[0161] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program including program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 709, and / or installed from removable medium 711.

[0162] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0163] For ease of description, the above devices are described separately by function as various units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0164] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0165] 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, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0166] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0167] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0168] 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.

[0169] This application can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. This application can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0170] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0171] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for primary frequency regulation and amplitude limiting in a thermal power unit, characterized in that, include: Determine whether the current power of the thermal power unit is greater than or equal to the rated power of the unit. If so, use the preset safety setting value as the frequency regulation power setting value; otherwise, obtain the frequency regulation power setting value based on the slip of the thermal power unit. The current valve position opening increment is obtained based on the frequency regulation power setting, the rated power of the unit, and the current power of the unit; wherein, the current valve position opening increment refers to the amount of valve position opening that needs to be increased after the DEH system of the thermal power unit has already made preliminary adjustments to the valve position opening; The target valve position opening increment is obtained based on the current valve position opening increment and the comprehensive valve position increment determined based on the slip of the thermal power unit. Before obtaining the target valve position opening increment based on the current valve position opening increment and the comprehensive valve position increment determined based on the slip of the thermal power unit, the method further includes: when the current power of the thermal power unit is greater than or equal to the rated power of the unit, obtaining a preset valve position increment based on the slip of the thermal power unit; obtaining a comprehensive valve position increment based on the rated power of the unit, the preset valve position increment, and a second limiting coefficient; when the current power of the thermal power unit is less than the rated power of the unit, obtaining a comprehensive valve position increment based on the slip of the thermal power unit. Specifically, when the unit changes from a state where the current power is greater than or equal to the rated power to a state where the current power is less than the rated power, the operation of limiting the frequency regulation of the thermal power unit by limiting the comprehensive valve position increment is not immediately terminated, but terminated only after waiting for a delay threshold duration. This reduces the probability of additional disturbances in the unit's power supply circuit caused by the frequent changes in the state of the limiting operation due to the frequent changes in the unit's power state.

2. The method according to claim 1, characterized in that, Before determining whether the current power of a thermal power unit is greater than or equal to its rated power, the following further steps are included: The safety setpoint is obtained based on the rated power of the unit and the first limiting factor.

3. The method according to claim 2, characterized in that, The process of obtaining the safety setpoint based on the rated power of the unit and the first limiting factor includes: The rated power of the unit is multiplied by the first limiting coefficient to obtain the safety set value.

4. The method according to claim 1, characterized in that, The process of obtaining the frequency regulation power setting based on the slip of the thermal power unit includes: The slip of the thermal power unit is input into a first preset inequality function to obtain the frequency regulation power setpoint.

5. The method according to claim 1, characterized in that, The step of obtaining the current valve position opening increment based on the frequency regulation power setpoint, the unit's rated power, and the unit's current power includes: The target power of the unit is obtained based on the rated power of the unit and the frequency regulation power setting. The required increase in power output of the unit is obtained based on the target power output and the current power output of the unit. The incremental valve opening is obtained by performing PID processing on the increased power demand of the unit.

6. The method according to claim 5, characterized in that, The step of obtaining the target power of the unit based on the rated power of the unit and the frequency regulation power setting includes: The target power of the unit is obtained by adding the rated power of the unit to the frequency regulation power setting.

7. The method according to claim 5, characterized in that, The step of obtaining the increased power demand of the unit based on the target power of the unit and the current power of the unit includes: The increased power requirement of the unit is obtained by subtracting the current power of the unit from the target power of the unit.

8. The method according to claim 1, characterized in that, The step of obtaining the target valve position opening increment based on the current valve position opening increment and the comprehensive valve position increment determined based on the slip of the thermal power unit includes: The target valve position opening increment is obtained by adding the current valve position opening increment to the comprehensive valve position increment determined based on the slip of the thermal power unit.

9. The method according to claim 1, characterized in that, The process of obtaining the comprehensive valve position increment based on the unit's rated power, the preset valve position increment, and the second limiting coefficient includes: Determine whether the rated power of the unit is within a first preset power range or a second preset power range. If it is within the first preset power range, then the second limiting coefficient is the first sub-limiting coefficient. The comprehensive valve position increment is obtained based on the first sub-limiting coefficient and the preset valve position increment. If it is within the second power preset range, then the second limiting coefficient is the second sub-limiting coefficient, and the comprehensive valve position increment is obtained according to the second sub-limiting coefficient and the preset valve position increment; Wherein, the minimum value of the first preset power range is greater than or equal to the maximum value of the second preset power range, and the first preset power range and the second preset power range do not intersect; the first sub-limiting coefficient is greater than the second sub-limiting coefficient.

10. The method according to claim 9, characterized in that, The step of obtaining the comprehensive valve position increment based on the first sub-limiting coefficient and the preset valve position increment includes: The first sub-limiting coefficient is multiplied by the preset valve position increment to obtain the comprehensive valve position increment.

11. The method according to claim 9, characterized in that, The step of obtaining the comprehensive valve position increment based on the second sub-limiting coefficient and the preset valve position increment includes: The second sub-limiting coefficient is multiplied by the preset valve position increment to obtain the comprehensive valve position increment.

12. A primary frequency regulation limiting device for thermal power units, characterized in that, include: The frequency regulation power setpoint determination module is used to determine whether the current power of the thermal power unit is greater than or equal to the rated power of the unit. If so, the preset safety setpoint is used as the frequency regulation power setpoint; otherwise, the frequency regulation power setpoint is obtained based on the slip of the thermal power unit. The current valve position opening increment determination module is used to obtain the current valve position opening increment based on the frequency regulation power setting, the rated power of the unit, and the current power of the unit; wherein, the current valve position opening increment refers to the amount of valve position opening that needs to be increased after the DEH system of the thermal power unit has already made preliminary adjustments to the valve position opening; The target valve position opening increment determination module is used to obtain a target valve position opening increment based on the current valve position opening increment and a comprehensive valve position increment determined based on the slip of the thermal power unit; wherein, before obtaining the target valve position opening increment based on the comprehensive valve position increment determined based on the current valve position opening increment and the slip of the thermal power unit, the module further includes: when the current power of the thermal power unit is greater than or equal to the rated power of the unit, obtaining a preset valve position increment based on the slip of the thermal power unit; and obtaining a comprehensive valve position increment based on the rated power of the unit, the preset valve position increment, and a second limiting coefficient. Increment; when the current power of the thermal power unit is less than the rated power of the unit, the comprehensive valve position increment is obtained based on the slip of the thermal power unit; specifically, when the state of the unit changes from the state of the current power of the unit being greater than or equal to the rated power of the unit to the state of the current power of the unit being less than the rated power of the unit, the operation of limiting the primary frequency regulation of the thermal power unit by limiting the comprehensive valve position increment is not immediately terminated, but terminated only after waiting for the delay threshold time, so as to reduce the probability of additional disturbances in the power supply circuit of the unit caused by the frequent changes in the state of the limiting operation and the frequent changes in the power state of the unit.

13. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method as described in any one of claims 1-11.

14. A computer-readable medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1-11.

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