Fire storage combined frequency modulation control method, device and equipment and medium

Abstract

The invention relates to the technical field of electric power systems, and discloses a thermal storage combined frequency modulation control method, device and equipment and a medium, and the method comprises the steps: determining the working state of a heat storage device according to the load value of a thermal generator set when a frequency modulation control instruction is received; the working state comprises heat storage and heat release; based on the working state of the heat storage device and the difference value between the power of the thermal generator set and the automatic power generation control target, the opening degree value of a steam adjusting door and the first charging and discharging power value of a lithium battery energy storage system are calculated, or the opening degree value of a hot water adjusting door and the second charging and discharging power value of the lithium battery energy storage system are calculated; generating a coordination control instruction; and controlling the charging and discharging power of the lithium battery energy storage system according to the coordination control instruction, and controlling the opening degree of a steam adjusting door and the opening degree of a hot water adjusting door of the heat storage device so as to carry out peak regulation and frequency modulation on the thermal generator set. According to the technical scheme, the frequency modulation performance of the thermal power generating unit can be improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of power systems, and in particular, to a combined thermal energy storage and battery energy storage frequency modulation control method, device, equipment, and computer-readable storage medium. Background Art

[0002] With the improvement of the modernization level and the influence of seasonal and temperature changes, the peak-valley difference of power consumption in the power system is getting larger and larger, resulting in the need for thermal power generating units to generate electricity at full capacity during peak periods; while during low-power consumption periods, it is required that thermal power generating units can still supply electric energy to the power grid under conditions lower than the stable combustion of the boiler.

[0003] Due to the short-term changes in user power consumption or the influence of weather on new energy sources such as wind and solar, the power generation power of new energy equipment fluctuates, resulting in an imbalance between power grid power supply and user power consumption. Therefore, under the existing technology, thermal power generating units or energy storage power stations need to make corresponding output adjustments to maintain the stability of the power grid frequency. However, the existing frequency modulation methods for thermal power generating units are single and the frequency modulation performance is poor. Summary of the Invention

[0004] In view of the above problems, the embodiments of the present application provide a combined thermal energy storage and battery energy storage frequency modulation control method, device, equipment, and computer-readable storage medium for improving the frequency modulation performance of thermal power generating units.

[0005] According to one aspect of the embodiments of the present application, a combined thermal energy storage and battery energy storage frequency modulation control method is provided, which is applied to a control device; the control device is respectively connected to a lithium battery energy storage system and a thermal energy storage device; both the lithium battery energy storage system and the thermal energy storage device are connected to a thermal power generating unit;

[0006] The method includes:

[0007] When receiving a frequency modulation control instruction, determine the working state of the thermal energy storage device according to the load value of the thermal power generating unit; the working state includes: heat storage and heat release;

[0008] Based on the working state of the thermal energy storage device and the difference between the power of the thermal power generating unit and the Automatic Generation Control (AGC) target, calculate the opening value of the steam regulating valve and the first charge and discharge power value of the lithium battery energy storage system, and generate a coordinated control instruction;

[0009] Or, based on the working state of the thermal energy storage device and the difference between the power of the thermal power generating unit and the Automatic Generation Control target, calculate the opening value of the hot water regulating valve and the second charge and discharge power value of the lithium battery energy storage system, and generate a coordinated control instruction;

[0010] Control the charging and discharging power of the lithium battery energy storage system according to the coordinated control instruction, and control the opening degrees of the steam regulating valve and the hot water regulating valve of the heat storage device to perform peak shaving and frequency modulation on the thermal power generating unit.

[0011] Specifically, different from the prior art, the present application combines heat storage and lithium battery energy storage for frequency modulation control. When the system is in the frequency modulation process of heat storage, the present application responds to the change of the automatic generation control of the unit by changing the opening degree of the steam regulating valve and the lithium battery charging and discharging power to quickly respond to the automatic generation control instruction. When the system is in the frequency modulation process of heat release, the present application responds to the change of the automatic generation control of the unit by changing the opening degree of the hot water regulating valve and the lithium battery charging and discharging power to quickly respond to the automatic generation control instruction and meet the requirement of rapid frequency modulation. The present application improves the frequency modulation performance of the thermal power generating unit by combining heat storage and lithium battery energy storage for frequency modulation control.

[0012] In an optional manner, when receiving a frequency modulation control instruction, determine the working state of the heat storage device according to the load value of the thermal power generating unit, including:

[0013] If the load value of the thermal power generating unit is less than or equal to the first preset value, determine that the working state of the heat storage device is heat storage;

[0014] If the load value of the thermal power generating unit is greater than or equal to the second preset value, determine that the working state of the heat storage device is heat release;

[0015] Wherein, the second preset value is greater than the first preset value.

[0016] Specifically, the present application determines whether the working state of the heat storage device is in the heat storage or heat release condition according to the load value of the thermal power generating unit, so as to, in the frequency modulation process when the system is in the heat storage or heat release condition, respond to the change of the automatic generation control of the unit by controlling the corresponding regulating valve opening degree and the lithium battery charging and discharging power, so as to quickly respond to the automatic generation control instruction and meet the requirement of rapid frequency modulation.

[0017] In an optional manner, if the working state of the heat storage device is heat storage, calculate the opening value of the steam regulating valve and the first charging and discharging power value of the lithium battery energy storage system based on the difference between the power of the thermal power generating unit and the automatic generation control target, and generate a first coordinated control instruction;

[0018] If the working state of the heat storage device is heat release, calculate the opening value of the hot water regulating valve and the second charging and discharging power value of the lithium battery energy storage system based on the difference between the power of the thermal power generating unit and the automatic generation control target, and generate a second coordinated control instruction.

[0019] In an alternative approach, calculating the opening value of the steam control valve and the first charge-discharge power value of the lithium battery energy storage system based on the difference between the power of the thermal power generating unit and the automatic generation control target includes:

[0020] Calculating the first charge-discharge power value of the lithium battery energy storage based on the difference between the power of the thermal power generating unit and the automatic generation control target and the rated charge-discharge power of the lithium battery energy storage system;

[0021] The expression for the first charge-discharge power value of the lithium battery energy storage is:

[0022] D pcs = sgn(D AGC - P G ) * min(fabs(P G - D AGC ), P essN );

[0023] Where D pcs is the charge-discharge power value of the lithium battery energy storage, positive for discharging and negative for charging; Sgn(﹒) is the sign function; when the value in the sign function is positive, the output is 1; when the value in the sign function is negative, the output is -1; when the value in the sign function is 0, the output is 0; P G is the active power of the thermal power generating unit; P essN is the rated charge-discharge power of the lithium battery energy storage system; the fabs function is the absolute value function; the sgn function is the sign function;

[0024] Determining the opening value of the steam control valve based on the comparison results of the difference between the power of the thermal power generating unit and the automatic generation control target with the first preset threshold and the second preset threshold;

[0025] The expression for the opening value of the steam control valve is:

[0026]

[0027] Where D stm is the opening value of the steam control valve; D AGC is the automatic generation control command value of the thermal power generating unit at the current moment; D stm_low is the minimum opening value of the steam control valve; D stm_med is the static operating point opening value of the steam control valve; D stm_old is the opening value of the steam control valve in the previous calculation cycle.

[0028] In an alternative approach, calculating the opening value of the hot water control valve and the second charge-discharge power value of the lithium battery energy storage system based on the difference between the power of the thermal power generating unit and the automatic generation control target includes:

[0029] Calculate the second charge-discharge power value of the lithium-ion energy storage according to the difference between the power of the thermal power generating unit and the automatic generation control target, and the rated charge-discharge power of the lithium-ion energy storage system;

[0030] The expression for the second charge-discharge power value of the lithium-ion energy storage is:

[0031] D pcs = sgn(D AGC - P G ) * min(fabs(P G - D AGC ), P essN ) ;

[0032] Wherein, D pcs is the charge-discharge power value of the lithium-ion energy storage, positive value means discharging, negative value means charging; Sgn(﹒) is the sign function; when the value in the sign function is positive, the output is 1; when the value in the sign function is negative, the output is -1; when the value in the sign function is 0, the output is 0; P G is the active power of the thermal power generating unit; P essN is the rated charge-discharge power of the lithium-ion energy storage system;

[0033] Determine the opening value of the hot water regulating valve based on the comparison results of the difference between the power of the thermal power generating unit and the automatic generation control target with the first preset threshold and the second preset threshold;

[0034] The expression for the opening value of the hot water regulating valve is:

[0035]

[0036] Wherein, D wtr is the opening value of the hot water regulating valve; D AGC is the automatic generation control command value of the thermal power generating unit at the current moment; D wtr_low is the minimum opening value of the hot water regulating valve; D wtr_med is the opening value of the static working point of the hot water regulating valve; D wtr_old is the opening value of the hot water regulating valve in the previous calculation period.

[0037] Specifically, when the system is in the frequency modulation process of heat storage, the present application changes the opening degree of the steam regulating valve and the lithium battery charging and discharging power, enables the lithium battery system to charge and discharge, and at the same time the heat storage device increases or decreases the extraction steam volume to respond to the change of the unit automatic generation control, so as to quickly respond to the automatic generation control instruction. When the system is in the frequency modulation process of heat release, the present application changes the opening degree of the hot water regulating valve and the lithium battery charging and discharging power to respond to the change of the unit automatic generation control, enables the lithium battery system to charge and discharge, and at the same time the heat storage device changes the hot water flow rate to quickly respond to the automatic generation control instruction and meet the demand of rapid frequency modulation. The present application improves the frequency modulation performance of the thermal power generating unit by combining heat storage and lithium battery energy storage for frequency modulation control.

[0038] In an alternative manner, before receiving the frequency modulation control instruction, it further includes:

[0039] If the working state of the heat storage device is heat storage, the opening degree of the steam regulating valve of the heat storage device is the static working point opening value of the steam regulating valve, and the hot water regulating valve is kept closed to extract the steam energy in the thermal power generating unit.

[0040] In an alternative manner, before receiving the frequency modulation control instruction, it further includes:

[0041] If the working state of the heat storage device is heat release, the opening degree of the hot water regulating valve of the heat storage device is the static working point opening value of the hot water regulating valve, and the steam regulating valve is kept closed to input the hot water energy into the thermal power generating unit.

[0042] Specifically, when the power grid is in the low electricity consumption period, that is, when the unit is in the low load section, the present application controls the steam regulating valve to open to extract the steam in the thermal power generating unit for heating the working medium (water) in the heat storage device; when the unit load is greater than the preset value, the steam regulating valve is closed. When the power grid is in the high electricity consumption period, that is, when the unit is in the medium and high load section, the present application injects hot water into the thermal process system of the generating unit by opening the hot water regulating valve in the heat storage device to input the hot water energy. On the basis of controlling the heat storage device in the process of working medium heat storage / heat release, the present application combines the lithium battery energy storage charging and discharging power to assist the thermal power generating unit to achieve combined frequency modulation, improving the frequency modulation performance of the thermal power unit.

[0043] According to another aspect of the embodiments of the present application, a combined heat and energy storage frequency modulation control device is provided, which is applied to a control device; the control device is respectively connected to a lithium battery energy storage system and a heat storage device; the lithium battery energy storage system and the heat storage device are both connected to a thermal power generating unit;

[0044] The device includes: a judgment module, a calculation module and a control module;

[0045] The judgment module is configured to determine the working state of the heat storage device according to the load value of the thermal power generating unit when receiving a frequency modulation control instruction; the working state includes: heat storage and heat release;

[0046] The calculation module is configured to calculate the opening value of the steam regulating valve and the first charge-discharge power value of the lithium battery energy storage system, or calculate the opening value of the hot water regulating valve and the second charge-discharge power value of the lithium battery energy storage system based on the working state of the heat storage device and the difference between the power of the thermal power unit and the automatic generation control target, and generate a coordinated control instruction;

[0047] The control module is configured to control the charge-discharge power of the lithium battery energy storage system according to the coordinated control instruction, and control the opening sizes of the steam regulating valve and the hot water regulating valve of the heat storage device to perform peak shaving and frequency modulation on the thermal power unit.

[0048] According to another aspect of the embodiments of the present application, a thermal storage and combined frequency modulation control device is provided, including: a processor, a memory, a communication interface, and a communication bus. The processor, the memory, and the communication interface complete communication with each other through the communication bus; the memory is used to store at least one executable instruction, and the executable instruction causes the processor to execute the operations of the thermal storage and combined frequency modulation control method as described in any one of the above.

[0049] According to still another aspect of the embodiments of the present application, a computer-readable storage medium is provided. The storage medium stores at least one executable instruction, and the executable instruction causes a thermal storage and combined frequency modulation control device to execute the operations of the thermal storage and combined frequency modulation control method as described in any one of the above.

[0050] The embodiments of the present application perform frequency modulation control by combining heat storage and lithium battery energy storage. When the system is in the frequency modulation process of heat storage, the present application responds to the change of the automatic generation control of the unit by changing the opening size of the steam regulating valve and the charge-discharge power of the lithium battery to quickly respond to the automatic generation control instruction. When the system is in the frequency modulation process of heat release, the present application responds to the change of the automatic generation control of the unit by changing the opening size of the hot water regulating valve and the charge-discharge power of the lithium battery to quickly respond to the automatic generation control instruction and meet the requirement of fast frequency modulation. The present application improves the frequency modulation performance of the thermal power generating unit by combining heat storage and lithium battery energy storage.

[0051] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to be able to understand the technical means of the embodiments of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features, and advantages of the embodiments of the present application more obvious and understandable, the following specifically describes the embodiments of the present application. Description of the Drawings

[0052] The accompanying drawings are only used to illustrate the embodiments and are not considered to limit the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0053] Figure 1 A flowchart showing an embodiment of the combined thermal energy storage and battery energy storage frequency regulation control method provided by the present application is shown;

[0054] Figure 2 A schematic structural diagram of a control device of the combined thermal energy storage and battery energy storage frequency regulation control method provided by the present application is shown;

[0055] Figure 3 A schematic structural diagram of an embodiment of the combined thermal energy storage and battery energy storage frequency regulation control device provided by the present application is shown;

[0056] Figure 4 A schematic structural diagram of an embodiment of the combined thermal energy storage and battery energy storage frequency regulation control device provided by the present application is shown. Detailed implementation manners

[0057] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0058] Embodiment 1 Figure 1 A flowchart showing an embodiment of the combined thermal energy storage and battery energy storage frequency regulation control method provided by the present application is shown. The method is executed by a control device; the control device is respectively connected to a lithium battery energy storage system and a heat storage device; both the lithium battery energy storage system and the heat storage device are connected to a thermal power generating unit. As Figure 1 shown, the method includes the following steps:

[0059] Step 110: When receiving a frequency regulation control instruction, determine the working state of the heat storage device according to the load value of the thermal power generating unit; the working state includes: heat storage and heat release.

[0060] Figure 2 A schematic structural diagram of an embodiment of a control device of the combined thermal energy storage and battery energy storage frequency regulation control method provided by the present application is shown. The control device includes: a unit coordinated control system and an energy storage coordinated controller; the unit coordinated control system is connected to the heat storage device and the thermal power generation system, and the energy storage coordinated controller is connected to the lithium battery energy storage system.

[0061] Specifically, the heat storage device includes: a heat storage tank, a steam regulating valve, and a hot water regulating valve; the thermal power generation system includes a main steam regulating valve and a thermal power generating unit; the lithium battery energy storage system includes: an energy storage converter group and a lithium battery pack. The unit coordinated control system is respectively connected to the steam regulating valve and the hot water regulating valve of the heat storage device, as well as the main steam regulating valve of the thermal power generation system, and is used to control the opening degrees of the steam regulating valve, the hot water regulating valve, and the main steam regulating valve. The energy storage coordinated controller is connected to the energy storage converter group and is used to control the charging and discharging power of the lithium battery pack.

[0062] In some embodiments of the present application, the heat storage device is used for peak shaving during the day-night peak-valley period of the thermal power generating unit. When the power grid is at a low electricity consumption valley, that is, when the unit is at a low load section, the present application controls the opening of the steam regulating valve and the main steam regulating valve, extracts the steam in the thermal power generating unit, and uses it to heat the working medium (water) in the heat storage device, which is the heat storage process of the working medium. When the unit load is greater than a preset value, the present application closes the steam regulating valve. When the power grid is at a high electricity consumption peak, that is, when the unit is at a medium-high load section, the present application injects hot water into the thermal process system of the generating unit by opening the hot water regulating valve in the heat storage device, inputs hot water energy, which is the heat release process of the working medium.

[0063] In some embodiments of the present application, the lithium battery energy storage system is used for short-term frequency modulation.

[0064] Specifically, when the load of the thermal power generating unit is less than or equal to the first preset value, the working state of the heat storage device is determined to be heat storage.

[0065] If the load value of the thermal power generating unit is greater than or equal to the second preset value, the working state of the heat storage device is determined to be heat release; where the second preset value is greater than the first preset value.

[0066] Preferably, the first preset value is the stable combustion load value, the second preset value is 40% of the rated load value of the thermal power generating unit, and the stable combustion load value is greater than 40% of the rated load value of the thermal power generating unit; a dead zone or a hysteresis zone is set between the first preset value and the second preset value. Under any operating conditions of the thermal power generating unit, the energy storage and energy release processes of the working medium cannot exist simultaneously at the same moment. That is, the steam regulating valve and the hot water regulating valve cannot be opened simultaneously.

[0067] In an alternative manner, before receiving the frequency modulation control instruction, it further includes:

[0068] If the working state of the heat storage device is heat storage, the opening degree of the steam regulating valve of the heat storage device is the static working point opening degree value of the steam regulating valve, and the hot water regulating valve is kept closed to extract the steam energy in the thermal power generating unit.

[0069] In an alternative manner, before receiving the frequency modulation control instruction, it further includes:

[0070] If the working state of the thermal energy storage device is heat release, the opening degree of the hot water regulating valve of the thermal energy storage device is the static working point opening value of the hot water regulating valve, and the steam regulating valve is kept closed to input hot water energy into the thermal power generating unit.

[0071] Specifically, before receiving the frequency modulation control instruction, the thermal energy storage device is in the pure heat storage working condition or in the pure energy release (heat release) working condition. If the thermal energy storage device is in the pure heat storage working condition, the opening degree of the steam regulating valve of the thermal energy storage device is the static working point opening value of the steam regulating valve, and the hot water regulating valve is kept closed to extract steam energy from the thermal power generating unit. If the thermal energy storage device is in the pure energy release working condition, the opening degree of the hot water regulating valve of the thermal energy storage device is the static working point opening value of the hot water regulating valve, and the steam regulating valve is kept closed to input hot water energy into the thermal power generating unit.

[0072] Preferably, the static working point opening values of both the steam regulating valve and the hot water regulating valve are not 100%. When receiving the frequency modulation control instruction and the thermal power generating unit participates in frequency modulation, there is a certain adjustment margin for the steam regulating valve or the hot water regulating valve to respond to the change of the automatic generation control of the unit, and it realizes combined frequency modulation with the lithium battery energy storage.

[0073] Step 120: Generate a coordinated control instruction based on the working state of the thermal energy storage device and the difference between the power of the thermal power generating unit and the automatic generation control target;

[0074] Or, based on the working state of the thermal energy storage device and the difference between the power of the thermal power generating unit and the automatic generation control target, calculate the opening value of the hot water regulating valve and the second charge and discharge power value of the lithium battery energy storage system, and generate a coordinated control instruction.

[0075] In an optional manner, if the working state of the thermal energy storage device is heat storage, calculate the opening value of the steam regulating valve and the first charge and discharge power value of the lithium battery energy storage system based on the difference between the power of the thermal power generating unit and the automatic generation control target, and generate a first coordinated control instruction;

[0076] If the working state of the thermal energy storage device is heat release, calculate the opening value of the hot water regulating valve and the second charge and discharge power value of the lithium battery energy storage system based on the difference between the power of the thermal power generating unit and the automatic generation control target, and generate a second coordinated control instruction.

[0077] In some embodiments of the present application, in order to prevent the oscillation of the steam regulating valve or the hot water regulating valve during the frequency modulation process, a dead zone link is set in the process of calculating the difference between the power of the thermal power generating unit and the automatic generation control target, that is, when the difference between the generator power and the generator automatic generation control target is very small, the steam regulating valve or the hot water regulating valve is at the opening degree of the static operating point. A hysteresis loop is also designed between the dead zone setting value and the adjustment threshold. That is, when the difference between the generator power and the generator automatic generation control target returns to the hysteresis loop, the opening degree of the steam regulating valve or the hot water regulating valve remains unchanged from the command of the previous moment. The present application increases the damping of the system through hysteresis, dead zone, and rate limit of returning to the static operating point, etc., to avoid the occurrence of oscillation phenomena during the adjustment process.

[0078] In an alternative manner, calculating the opening value of the steam regulating valve and the first charge and discharge power value of the lithium battery energy storage system based on the difference between the power of the thermal power generating unit and the automatic generation control target includes:

[0079] Calculating the first charge and discharge power value of the lithium battery energy storage according to the difference between the power of the thermal power generating unit and the automatic generation control target and the rated charge and discharge power of the lithium battery energy storage system;

[0080] The expression of the first charge and discharge power value of the lithium battery energy storage is:

[0081] D pcs = sgn(D AGC -P G ) * min(fabs(P G -D AGC ), P essN );

[0082] Wherein, D pcs is the charge and discharge power value of the lithium battery energy storage, positive value is for discharging, negative value is for charging; Sgn(﹒) is the sign function; when the value in the sign function is positive, the output is 1; when the value in the sign function is negative, the output is -1; when the value in the sign function is 0, the output is 0; P G is the active power of the thermal power generating unit; P essN is the rated charge and discharge power of the lithium battery energy storage system;

[0083] Determining the opening value of the steam regulating valve based on the comparison results of the difference between the power of the thermal power generating unit and the automatic generation control target with the first preset threshold and the second preset threshold respectively;

[0084] The expression of the opening value of the steam regulating valve is:

[0085]

[0086] Wherein, D stmis the opening value of the steam control valve; D AGC is the automatic generation control command value at the current moment of the thermal power generating unit; D stm_low is the minimum opening value of the steam control valve; D stm_med is the opening value of the static operating point of the steam control valve; D stm_old is the opening value of the steam control valve in the previous calculation cycle of the steam control valve, where, D stm = 100%, which is the maximum opening value of the steam control valve.

[0087] In an optional manner, based on the difference between the power of the thermal power generating unit and the automatic generation control target, calculate the opening value of the hot water control valve and the second charge-discharge power value of the lithium battery energy storage system, including:

[0088] Calculate the second charge-discharge power value of the lithium battery energy storage according to the difference between the power of the thermal power generating unit and the automatic generation control target and the rated charge-discharge power of the lithium battery energy storage system;

[0089] The expression of the second charge-discharge power value of the lithium battery energy storage is:

[0090] D pcs = sgn(D AGC -P G ) * min(fabs(P G -D AGC ), P essN );

[0091] where, D pcs is the charge-discharge power value of the lithium battery energy storage, positive value for discharging, negative value for charging; Sgn(﹒) is the sign function; when the value in the sign function is positive, the output is 1; when the value in the sign function is negative, the output is -1; when the value in the sign function is 0, the output is 0; P G is the active power of the thermal power generating unit; P essN is the rated charge-discharge power of the lithium battery energy storage system;

[0092] Based on the comparison results of the difference between the power of the thermal power generating unit and the automatic generation control target with the first preset threshold and the second preset threshold respectively, determine the opening value of the hot water control valve;

[0093] The expression of the opening value of the hot water control valve is:

[0094]

[0095] where, D wtr is the opening value of the hot water control valve; D AGC is the automatic generation control command value at the current moment of the thermal power generating unit; D wtr_low is the minimum opening value of the hot water control valve; Dwtr_med is the static operating opening value of the hot water regulating valve; D wtr_old is the opening value of the hot water regulating valve in the previous calculation cycle of the hot water regulating valve. Among them, D wtr = 100%, which is the maximum opening value of the hot water regulating valve.

[0096] Step 130: Control the charge and discharge power of the lithium battery energy storage system according to the coordinated control instruction, and control the opening sizes of the steam regulating valve and the hot water regulating valve of the heat storage device to perform peak shaving and frequency modulation on the thermal power generating unit.

[0097] Specifically, the energy storage / discharge of the working medium and the frequency modulation of the lithium battery energy storage system are under the same priority control. The lithium battery energy storage system can be used to overcome the time delay in the entire combined frequency modulation process, thereby improving the frequency modulation performance of the response process.

[0098] In the embodiment of the present application, frequency modulation control is carried out by combining heat storage and lithium battery energy storage. When the system is in the frequency modulation process of heat storage, the present application responds to the change of the automatic generation control of the unit by changing the opening size of the steam regulating valve and the charge and discharge power of the lithium battery, so as to quickly respond to the automatic generation control instruction. When the system is in the frequency modulation process of heat release, the present application responds to the change of the automatic generation control of the unit by changing the opening size of the hot water regulating valve and the charge and discharge power of the lithium battery, so as to quickly respond to the automatic generation control instruction and meet the demand of rapid frequency modulation. The present application improves the frequency modulation performance of the thermal power generating unit by combining heat storage and lithium battery energy storage for frequency modulation control.

[0099] Embodiment 2, Figure 3 shows a schematic structural diagram of an embodiment of the thermal storage and combined frequency modulation control device of the present application; as Figure 3 shown, the device 200 is applied to a control device; the control device is respectively connected to the lithium battery energy storage system and the heat storage device; the lithium battery energy storage system and the heat storage device are both connected to the thermal power generating unit;

[0100] The device 200 includes: a judgment module 210, a calculation module 220 and a control module 230;

[0101] The judgment module 210 is used to determine the working state of the heat storage device according to the load value of the thermal power generating unit when receiving a frequency modulation control instruction; the working state includes: heat storage and heat release;

[0102] The calculation module 220 is used to calculate the opening value of the steam regulating valve and the first charge and discharge power value of the lithium battery energy storage system based on the working state of the heat storage device and the difference between the power of the thermal power unit and the automatic generation control target, and generate a coordinated control instruction;

[0103] Alternatively, based on the working state of the heat storage device and the difference between the power of the thermal power generating unit and the automatic generation control target, calculate the opening value of the hot water regulating valve and the second charge-discharge power value of the lithium battery energy storage system, and generate a coordinated control instruction;

[0104] The control module 230 is configured to control the charge-discharge power of the lithium battery energy storage system according to the coordinated control instruction, and control the opening sizes of the steam regulating valve and the hot water regulating valve of the heat storage device, so as to perform peak shaving and frequency modulation on the thermal power unit.

[0105] In an alternative manner, when a frequency modulation control instruction is received, determine the working state of the heat storage device according to the load value of the thermal power generating unit, including:

[0106] If the load value of the thermal power generating unit is less than or equal to a first preset value, determine that the working state of the heat storage device is heat storage;

[0107] If the load value of the thermal power generating unit is greater than or equal to a second preset value, determine that the working state of the heat storage device is heat release;

[0108] Wherein, the second preset value is greater than the first preset value.

[0109] In an alternative manner, if the working state of the heat storage device is heat storage, based on the difference between the power of the thermal power generating unit and the automatic generation control target, calculate the opening value of the steam regulating valve and the first charge-discharge power value of the lithium battery energy storage system, and generate a first coordinated control instruction;

[0110] If the working state of the heat storage device is heat release, based on the difference between the power of the thermal power generating unit and the automatic generation control target, calculate the opening value of the hot water regulating valve and the second charge-discharge power value of the lithium battery energy storage system, and generate a second coordinated control instruction.

[0111] In an alternative manner, the calculating the opening value of the steam regulating valve and the first charge-discharge power value of the lithium battery energy storage system based on the difference between the power of the thermal power generating unit and the automatic generation control target includes:

[0112] Calculate the first charge-discharge power value of the lithium battery energy storage according to the difference between the power of the thermal power generating unit and the automatic generation control target and the rated charge-discharge power of the lithium battery energy storage system;

[0113] The expression of the first charge-discharge power value of the lithium battery energy storage is:

[0114] D pcs = sgn(D AGC -P G ) * min(fabs(P G -D AGC ), PessN );

[0115] Wherein, D pcs is the charge and discharge power value of the lithium - ion energy storage. A positive value represents discharge, and a negative value represents charge; Sgn(﹒) is the sign function. When the value in the sign function is positive, the output is 1; when the value in the sign function is negative, the output is - 1; when the value in the sign function is 0, the output is 0; P G is the active power of the thermal power generating unit; P essN is the rated charge and discharge power of the lithium - ion energy storage system;

[0116] Based on the comparison results of the difference between the power of the thermal power generating unit and the automatic generation control target with the first preset threshold and the second preset threshold respectively, determine the opening value of the steam control valve;

[0117] The expression for the opening value of the steam control valve is:

[0118]

[0119] Wherein, D stm is the opening value of the steam control valve; D AGC is the automatic generation control command value of the thermal power generating unit at the current moment; D stm_low is the minimum opening value of the steam control valve; D stm_med is the opening value of the static operating point of the steam control valve; D stm_old is the opening value of the steam control valve in the previous calculation cycle.

[0120] In an alternative manner, based on the difference between the power of the thermal power generating unit and the automatic generation control target, calculate the opening value of the hot - water control valve and the second charge and discharge power value of the lithium - battery energy storage system, including:

[0121] According to the difference between the power of the thermal power generating unit and the automatic generation control target and the rated charge and discharge power of the lithium - ion energy storage system, calculate the second charge and discharge power value of the lithium - ion energy storage;

[0122] The expression for the second charge and discharge power value of the lithium - ion energy storage is:

[0123] D pcs = sgn(D AGC - P G ) * min(fabs(P G - D AGC ), P essN );

[0124] Wherein, D pcsThe charging and discharging power value for lithium - ion energy storage, where a positive value represents discharging and a negative value represents charging; Sgn(﹒) is the sign function; when the value in the sign function is positive, the output is 1; when the value in the sign function is negative, the output is - 1; when the value in the sign function is 0, the output is 0; P G is the active power of the thermal power generating unit; P essN is the rated charging and discharging power of the lithium - ion energy storage system;

[0125] Based on the comparison results between the difference between the power of the thermal power generating unit and the automatic generation control target and the first preset threshold and the second preset threshold respectively, determine the opening value of the hot - water regulating valve;

[0126] The expression for the opening value of the hot - water regulating valve is:

[0127]

[0128] where D wtr is the opening value of the hot - water regulating valve; D AGC is the automatic generation control command value of the thermal power generating unit at the current moment; D wtr_low is the minimum opening value of the hot - water regulating valve; D wtr_med is the opening value of the static operating point of the hot - water regulating valve; D wtr_old is the opening value of the hot - water regulating valve in the previous calculation period.

[0129] In an alternative embodiment, the device 200 further includes: a heat storage control module and a heat release control module;

[0130] The heat storage control module is configured to, if the working state of the heat storage device is heat storage, open the steam regulating valve of the heat storage device to an opening size equal to the opening value of the static operating point of the steam regulating valve, and keep the hot - water regulating valve closed to extract the steam energy from the thermal power generating unit.

[0131] The heat release control module is configured to, if the working state of the heat storage device is heat release, open the hot - water regulating valve of the heat storage device to an opening size equal to the opening value of the static operating point of the hot - water regulating valve, and keep the steam regulating valve closed to input hot - water energy into the thermal power generating unit.

[0132] For the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple. For related parts, refer to the partial description of the method embodiments.

[0133] Embodiment 3, Figure 4 shows the structural schematic diagram of the embodiment of the device of the present application. The specific implementation of the combined thermal - storage frequency - regulation control device of the present application is not limited.

[0134] Such as Figure 4As shown, the combined thermal energy and energy storage frequency modulation control device may include: a processor 302, a communication interface 304, a memory 306, and a communication bus 308.

[0135] Among them: The processor 302, the communication interface 304, and the memory 306 communicate with each other through the communication bus 308. The communication interface 304 is used to communicate with network elements of other devices such as clients or other servers. The processor 302 is used to execute the program 310, and specifically can execute the relevant steps in the above embodiments of the combined thermal energy and energy storage frequency modulation control method.

[0136] Specifically, the program 310 may include program code, and the program code includes computer-executable instructions.

[0137] The processor 302 may be a central processing unit CPU, or a specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application. One or more processors included in the combined thermal energy and energy storage frequency modulation control device may be of the same type of processor, such as one or more CPUs; or may be of different types of processors, such as one or more CPUs and one or more ASICs.

[0138] The memory 306 is used to store the program 310. The memory 306 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk memory.

[0139] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. In addition, the embodiments of the present application are not directed to any specific programming language.

[0140] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present application can be practiced without these specific details. Similarly, in order to streamline the present application and help understand one or more of the various inventive aspects, in the above description of the exemplary embodiments of the present application, the various features of the embodiments of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. Among them, the claims following the specific implementation manner are hereby expressly incorporated into the specific implementation manner, and each claim itself is a separate embodiment of the present application.

[0141] Those skilled in the art can understand that the modules in the devices in the embodiments can be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments can be combined into one module or unit or component, and in addition, they can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive.

[0142] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present application can be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In a unit claim listing several devices, several of these devices may be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not denote any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. A combined frequency modulation control method for heat and storage, characterized in that: Applicable to a control device; the control device is connected to a lithium battery energy storage system and a heat storage device respectively; the lithium battery energy storage system and the heat storage device are both connected to a thermal power generating set; The method comprises: When receiving the frequency modulation control instruction, the working state of the heat storage device is determined according to the load value of the thermal power generating set; the working state includes: heat storage and heat release; Based on the working state of the heat storage device and the difference between the power of the thermal power generating set and the automatic power generation control target, the opening value of the steam regulating door and the first charging and discharging power value of the lithium battery energy storage system are calculated to generate a coordinated control instruction; Alternatively, based on the working state of the heat storage device and the difference between the power of the thermal power generator set and the automatic power generation control target, the opening value of the hot water regulating door and the second charging and discharging power value of the lithium battery energy storage system are calculated to generate a coordinated control instruction; The charging and discharging power of the lithium battery energy storage system is controlled according to the coordinated control instruction, and the opening size of the steam regulating door and the opening size of the hot water regulating door of the heat storage device are controlled to perform peak and frequency regulation on the thermal power generating set.

2. The combined frequency modulation control method of fire and storage according to claim 1 is characterized in that: When the frequency modulation control instruction is received, the working state of the heat storage device is determined according to the load value of the thermal power generating set, including: If the load value of the thermal power generating set is less than or equal to the first preset value, determining that the working state of the heat storage device is heat storage; If the load value of the thermal power generating set is greater than or equal to the second preset value, determining that the working state of the heat storage device is heat release; Wherein, the second preset value is greater than the first preset value.

3. The combined frequency modulation control method of fire and storage according to claim 1 is characterized in that: include: If the working state of the heat storage device is heat storage, the opening value of the steam regulating door and the first charging and discharging power value of the lithium battery energy storage system are calculated based on the difference between the power of the thermal power generating set and the automatic power generation control target, and a first coordinated control instruction is generated; If the working state of the heat storage device is heat release, the opening value of the hot water regulating door and the second charging and discharging power value of the lithium battery energy storage system are calculated based on the difference between the power of the thermal power generating set and the automatic power generation control target, and a second coordinated control instruction is generated.

4. The combined frequency modulation control method of fire and storage according to claim 3 is characterized in that: The method of calculating the opening value of the steam regulating door and the first charge and discharge power value of the lithium battery energy storage system based on the difference between the power of the thermal power generating set and the automatic power generation control target includes: Calculate the first charge and discharge power value of the lithium battery energy storage according to the difference between the power of the thermal power generating set and the automatic power generation control target, and the rated charge and discharge power of the lithium battery energy storage system; Based on the comparison results of the difference between the power of the thermal power generating unit and the automatic power generation control target with the first preset threshold and the second preset threshold respectively, the opening value of the steam regulating valve is determined to be the maximum opening value of the steam regulating valve, the minimum opening value of the steam regulating valve, the static operating point opening value of the steam regulating valve, or the steam regulating valve opening value of the previous calculation cycle of the steam regulating valve.

5. The combined frequency modulation control method of fire and storage according to claim 3 is characterized in that: The method of calculating the opening value of the hot water regulating door and the second charge and discharge power value of the lithium battery energy storage system based on the difference between the power of the thermal power generating set and the automatic power generation control target includes: Calculate the second charge and discharge power value of the lithium battery energy storage according to the difference between the power of the thermal power generating unit and the automatic power generation control target and the rated charge and discharge power of the lithium battery energy storage system; Based on the comparison results of the difference between the power of the thermal power generating unit and the automatic power generation control target with the first preset threshold and the second preset threshold respectively, the opening value of the hot water regulating door is determined to be the minimum opening value of the hot water regulating door, the maximum opening value of the hot water regulating door, the static operating point opening value of the hot water regulating door, or the hot water regulating door opening value of the previous calculation cycle of the hot water regulating door.

6. The combined frequency modulation control method of fire and storage according to claim 4 is characterized in that: Before receiving the frequency modulation control instruction, it also includes: If the working state of the heat storage device is heat storage, the opening size of the steam regulating door of the heat storage device is the static working point opening value of the steam regulating door, and the hot water regulating door is kept closed to extract steam energy from the thermal power generating set.

7. The combined frequency modulation control method of fire and storage according to claim 5 is characterized in that: Before receiving the frequency modulation control instruction, it also includes: If the working state of the heat storage device is heat release, the opening size of the hot water regulating door of the heat storage device is the static working point opening value of the hot water regulating door, and the steam regulating door is kept closed to input hot water energy to the thermal power generating set.

8. A combined frequency modulation control device for fire and storage, characterized in that: Applicable to control equipment; the control equipment is connected to a lithium battery energy storage system and a heat storage device respectively; the lithium battery energy storage system and the heat storage device are both connected to a thermal power generating set; The device comprises: a judgment module, a calculation module and a control module; The judgment module is used to determine the working state of the heat storage device according to the load value of the thermal power generating set when receiving the frequency modulation control instruction; the working state includes: heat storage and heat release; The calculation module is used to calculate the opening value of the steam regulating door and the first charging and discharging power value of the lithium battery energy storage system based on the working state of the heat storage device and the difference between the power of the thermal power generator set and the automatic power generation control target, and generate a coordinated control instruction; Alternatively, based on the working state of the heat storage device and the difference between the power of the thermal power generator set and the automatic power generation control target, the opening value of the hot water regulating door and the second charging and discharging power value of the lithium battery energy storage system are calculated to generate a coordinated control instruction; The control module is used to control the charging and discharging power of the lithium battery energy storage system according to the coordinated control instructions, and control the opening size of the steam regulating door and the hot water regulating door of the heat storage device to perform peak and frequency regulation on the thermal power generating set.

9. A fire-storage combined frequency modulation control device, characterized in that: include: A processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus; The memory is used to store at least one executable instruction, and the executable instruction enables the processor to perform the operation of the fire-storage combined frequency regulation control method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The storage medium stores at least one executable instruction. When the executable instruction is executed on the fire-storage combined frequency regulation control device / apparatus, the device / apparatus executes the operation of the fire-storage combined frequency regulation control method as described in any one of claims 1-7.

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