CN117713143A - Novel thermal power coupling energy storage multi-time scale coordination control method and system - Google Patents
Novel thermal power coupling energy storage multi-time scale coordination control method and system Download PDFInfo
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Abstract
The application relates to the technical field of power grid frequency modulation, in particular to a novel thermal power coupling energy storage multi-time scale coordination control method and system, wherein the method comprises the steps of acquiring running parameters of a unit and a power grid instruction in real time; calculating energy storage response requirements in any one mode of a moment of inertia control mode, a primary frequency modulation mode and a secondary frequency modulation mode based on the operation parameters and the power grid instruction; constructing an objective function and constraint conditions based on unit power cost and distribution power corresponding to the flywheel, the super capacitor and the lithium battery, wherein the sum of the distribution power corresponding to the flywheel, the super capacitor and the lithium battery in the constraint conditions in different modes is equal to the energy storage response requirement in the corresponding mode; and when constraint conditions are met in different modes, solving an optimal solution with the minimum objective function, wherein the optimal solution comprises an optimal solution of distributed power corresponding to the flywheel, the super capacitor and the lithium battery, and the flywheel, the super capacitor and the lithium battery are controlled to respond based on the optimal solution so as to realize multi-time scale control and improve the benefit of energy storage control.
Description
Technical Field
The application relates to the technical field of power grid frequency modulation, in particular to a novel thermal power coupling energy storage multi-time scale coordination control method and system.
Background
In a novel power system taking new energy as a main body, the problems of volatility and randomness exist in new energy power generation, and the power generation and power utilization sides are not controllable. When the frequency of the power system fluctuates, there are three stages, namely: inertia response phase, primary frequency modulation phase and secondary frequency modulation phase. The three phases correspond to three time scales. The existing thermal power coupling energy storage frequency modulation auxiliary service is mainly used for carrying out secondary frequency modulation, and primary frequency modulation is also carried out independently, and meanwhile, a coordination control method for satisfying inertia support, primary frequency modulation and secondary frequency modulation is not available, so that the existing frequency modulation auxiliary technology does not realize multi-time scale control, and thermal power coupling energy storage cannot achieve economic optimization, and energy storage resources are wasted.
Disclosure of Invention
The present application aims to solve, at least to some extent, one of the technical problems in the related art.
Therefore, a first object of the present application is to provide a novel thermal power coupling energy storage multi-time scale coordinated control method, so as to realize multi-time scale control and improve the benefit of energy storage control.
A second object of the present application is to provide a novel thermal power coupling energy storage multi-time scale coordination control system.
A third object of the present application is to propose an electronic device.
A fourth object of the present application is to propose a computer readable storage medium.
To achieve the above objective, an embodiment of a first aspect of the present application provides a novel thermal power coupling energy storage multi-time scale coordination control method, where a hybrid energy storage device configured in a thermal power plant includes a flywheel, a super capacitor and a lithium battery, and the coordination control method includes the following steps:
acquiring operation parameters of a unit and a power grid instruction in real time, wherein the operation parameters comprise an actual rotating speed, an actual frequency, slip, frequency difference, slip change rate, frequency difference change rate and real-time load of the unit, and the power grid instruction comprises an AGC instruction and a primary frequency modulation input signal issued by a power grid;
based on the acquired operation parameters and the power grid instruction, calculating and acquiring an energy storage response requirement of the unit in any one mode of a rotational inertia control mode, a primary frequency modulation mode and a secondary frequency modulation mode;
constructing an objective function and constraint conditions based on unit power cost and distribution power corresponding to the flywheel, the super capacitor and the lithium battery, wherein under different modes, the sum of the distribution power corresponding to the flywheel, the super capacitor and the lithium battery in the constraint conditions is equal to the energy storage response requirement under the corresponding mode;
under different modes, when constraint conditions are met, solving an optimal solution with the minimum objective function, wherein the optimal solution comprises an optimal solution for distributing power corresponding to the flywheel, the super capacitor and the lithium battery, and the flywheel, the super capacitor and the lithium battery are respectively controlled to respond based on the optimal solution.
In the method of the first aspect of the present application, calculating, based on the acquired operation parameters and the power grid command, the energy storage response requirement of the unit in any one of the moment of inertia control mode, the primary frequency modulation mode and the secondary frequency modulation mode includes: if the slip and the slip change rate meet the first set condition or the frequency difference and the frequency difference change rate meet the second set condition, entering a moment of inertia control mode; obtaining a first energy storage response requirement under the mode based on rated power, actual frequency and rated frequency of the unit of the hybrid energy storage device; if the primary frequency modulation input signal is detected and the slip or the frequency difference exceeds the corresponding dead zone, entering a primary frequency modulation mode; obtaining a second energy storage response requirement under the mode based on the actual rotating speed, the actual frequency, the rated rotating speed, the rated frequency, the slip dead zone, the frequency slip dead zone and the real-time load of the unit; if the AGC command is detected, a secondary frequency modulation mode is entered; and obtaining a third energy storage response requirement under the mode based on the AGC instruction and the real-time load of the unit.
In the method of the first aspect of the present application, the first energy storage response requirement satisfies:wherein->In response to the demand for the first stored energy,T J is a set time constant, +.>Is the rated frequency of the unit, < >>Is the actual frequency, t is time, +.>Is the rated power of the hybrid energy storage device.
In the method of the first aspect of the present application, the obtaining the second energy storage response requirement in the mode based on the actual rotation speed, the actual frequency, the rated rotation speed, the rated frequency, the slip dead zone, the frequency slip dead zone and the real-time load of the unit includes: if the slip or the frequency difference exceeds the corresponding dead zone, obtaining a slip per unit value based on the actual rotating speed and the rated rotating speed; obtaining a frequency difference per unit value based on the actual frequency and the rated frequency; and determining the maximum value in the slip per unit value and the frequency difference per unit value, and calculating to obtain a second energy storage response requirement based on the maximum value.
In the method of the first aspect of the present application, the calculating the second energy storage response requirement based on the maximum value includes: subtracting the dead zone per unit value from the maximum value, and then performing frequency difference amplification to obtain power corresponding to deviation; and the deviation corresponds to the power minus the real-time load of the unit to obtain a second energy storage response requirement.
In the method of the first aspect of the present application, the AGC instruction carries a load response requirement, and the obtaining the third energy storage response requirement in the mode based on the AGC instruction and the real-time load of the unit includes: acquiring an energy storage deviation amount based on the load response requirement and the real-time load of the unit; and delaying and limiting the energy storage deviation amount to obtain a third energy storage response requirement.
In the method of the first aspect of the present application, the objective function is a product sum of a unit power cost corresponding to the flywheel, the super capacitor and the lithium battery and a corresponding distributed power.
To achieve the above objective, an embodiment of a second aspect of the present application provides a novel thermal power coupling energy storage multi-time scale coordination control system, a hybrid energy storage device configured in a thermal power plant includes a flywheel, a super capacitor and a lithium battery, and the coordination control system includes:
the energy storage control system is used for acquiring the operation parameters of the unit and the power grid instruction in real time, wherein the operation parameters comprise the actual rotation speed, the actual frequency, the slip, the frequency difference, the slip change rate, the frequency difference change rate and the real-time load of the unit, and the power grid instruction comprises an AGC instruction and a primary frequency modulation input signal issued by the power grid;
the functional module is used for calculating and obtaining energy storage response requirements of the unit in any one mode of a rotational inertia control mode, a primary frequency modulation mode and a secondary frequency modulation mode based on the acquired operation parameters and power grid instructions;
the optimal economic power distribution module is used for constructing an objective function and constraint conditions based on unit power cost and distribution power corresponding to the flywheel, the super capacitor and the lithium battery, wherein under different modes, the sum of the distribution power corresponding to the flywheel, the super capacitor and the lithium battery in the constraint conditions is equal to the energy storage response requirement under the corresponding mode; under different modes, when constraint conditions are met, solving an optimal solution with the minimum objective function, wherein the optimal solution comprises an optimal solution for distributing power corresponding to the flywheel, the super capacitor and the lithium battery, and the flywheel, the super capacitor and the lithium battery are respectively controlled to respond based on the optimal solution.
To achieve the above object, an embodiment of a third aspect of the present application provides an electronic device, including: a processor, and a memory communicatively coupled to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method set forth in the first aspect of the present application.
To achieve the above object, an embodiment of a fourth aspect of the present application proposes a computer-readable storage medium having stored therein computer-executable instructions for implementing the method proposed in the first aspect of the present application when being executed by a processor.
The novel thermal power coupling energy storage multi-time scale coordination control method, system, electronic equipment and storage medium provided by the application acquire the running parameters of the unit and the power grid instruction in real time, wherein the running parameters comprise actual rotating speed, actual frequency, slip, frequency difference, slip change rate, frequency difference change rate and real-time load of the unit, and the power grid instruction comprises an AGC instruction and a primary frequency modulation input signal issued by the power grid; based on the acquired operation parameters and the power grid instruction, calculating and acquiring an energy storage response requirement of the unit in any one mode of a rotational inertia control mode, a primary frequency modulation mode and a secondary frequency modulation mode; constructing an objective function and constraint conditions based on unit power cost and distribution power corresponding to the flywheel, the super capacitor and the lithium battery, wherein under different modes, the sum of the distribution power corresponding to the flywheel, the super capacitor and the lithium battery in the constraint conditions is equal to the energy storage response requirement under the corresponding mode; under different modes, when constraint conditions are met, solving an optimal solution with the minimum objective function, wherein the optimal solution comprises an optimal solution for distributing power corresponding to the flywheel, the super capacitor and the lithium battery, and the flywheel, the super capacitor and the lithium battery are respectively controlled to respond based on the optimal solution. Under the condition, integrating the actual rotating speed, the actual frequency, the slip, the frequency difference, the slip change rate, the frequency difference change rate, the real-time load of the units, and the AGC instruction issued by the power grid, the operation parameters of a plurality of units of primary frequency modulation input signals and the power grid instruction to calculate and obtain the energy storage response requirement of the units in any one mode of a rotational inertia control mode, a primary frequency modulation mode and a secondary frequency modulation mode; and constructing an objective function and constraint conditions based on the unit power cost and the distributed power corresponding to the flywheel, the super capacitor and the lithium battery and the response requirements under different modes, so as to obtain an optimal solution of the minimum objective function under different modes, further realize optimal control of the flywheel, the super capacitor and the lithium battery under different modes based on the optimal solution, realize control of multiple time scales, and have the minimum cost, namely the maximum benefit under each mode, thereby improving the benefit of energy storage control.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic flow chart of a novel thermal power coupling energy storage multi-time scale coordination control method provided by an embodiment of the application;
fig. 2 is a flowchart of a method for acquiring a second energy storage response requirement in a primary frequency modulation mode according to an embodiment of the present application;
FIG. 3 is a control flow of secondary frequency modulation according to an embodiment of the present disclosure;
FIG. 4 is a flowchart of a method for obtaining a third energy storage response requirement in a secondary frequency modulation mode according to an embodiment of the present disclosure;
fig. 5 is a block diagram of a novel thermal power coupling energy storage multi-time scale coordination control system provided in an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.
The following describes a novel thermal power coupling energy storage multi-time scale coordination control method and system according to an embodiment of the application with reference to the accompanying drawings.
The embodiment of the application provides a novel thermal power coupling energy storage multi-time scale coordination control method so as to realize multi-time scale control and improve the benefit of energy storage control.
In this application, a hybrid energy storage device configured for a thermal power plant includes a flywheel, a super capacitor, and a lithium battery. The hybrid energy storage device assists the thermal power generating unit to participate in multi-time scale coordination control.
Fig. 1 is a schematic flow chart of a novel thermal power coupling energy storage multi-time scale coordination control method provided by an embodiment of the application.
As shown in fig. 1, the novel thermal power coupling energy storage multi-time scale coordination control method comprises the following steps:
step S101, operation parameters of a unit and power grid instructions are obtained in real time.
In step S101, the energy storage control system acquires the operation parameters of the unit and the power grid command in real time.
In step S101, the operation parameters of the unit include an actual rotation speed, an actual frequency, a slip, a frequency difference, a slip change rate, a frequency difference change rate, and a real-time load of the unit.
In step S101, the power grid command includes an AGC (Automatic Generation Control, automatic power generation control) command issued by the power grid and a primary frequency modulation input signal.
In step S101, the rated rotational speed, the rated frequency, the rated power of the hybrid energy storage device, and the like of the unit are also acquired.
Step S102, based on the acquired operation parameters and the power grid instruction, the energy storage response requirement of the unit in any one mode of a rotational inertia control mode, a primary frequency modulation mode and a secondary frequency modulation mode is calculated and obtained.
In step S102, based on the acquired operation parameters and the power grid command, the energy storage response requirement of the unit in any one of the moment of inertia control mode, the primary frequency modulation mode and the secondary frequency modulation mode is calculated and obtained, including: if the slip and the slip change rate meet the first set condition or the frequency difference and the frequency difference change rate meet the second set condition, entering a moment of inertia control mode; obtaining a first energy storage response requirement in the mode based on the rated power, the actual frequency and the rated frequency of the unit of the hybrid energy storage device (step S1021); if the primary frequency modulation input signal is detected and the slip or the frequency difference exceeds the corresponding dead zone, entering a primary frequency modulation mode; obtaining a second energy storage response requirement under the mode based on the actual rotating speed, the actual frequency, the rated rotating speed, the rated frequency, the slip dead zone, the frequency slip dead zone and the real-time load of the unit (step S1022); if the AGC instruction is detected, a secondary frequency modulation mode is entered; a third energy storage response requirement in this mode is obtained based on the AGC instruction, the real-time load of the unit (step S1023).
In step S1021, the slip and the slip change rate satisfying the first set condition means that the slip is within the set slip range and the slip change rate is not equal to zero; the fact that the frequency difference and the frequency difference change rate meet the second set condition means that the frequency difference is located in a set frequency difference range and the frequency difference change rate is not equal to zero. For example, when it is detected that the slip is at [ -2 rpm, +2 rpm ] and the slip rate is not equal to zero, or that the frequency difference is at [ -0.033Hz, +0.033Hz ] and the frequency difference rate is not equal to zero, the energy storage control system controls the moment of inertia control module to enter the moment of inertia control mode (i.e., enter the inertia response phase).
In step S1021, the energy storage response requirement in the moment of inertia control mode is a first energy storage response requirement, which may be calculated by the moment of inertia control module.
In step S1021, the first energy storage response requirement satisfies:in which, in the process,in response to the demand for the first stored energy,T J is a set time constant, +.>Is the rated frequency of the unit, < >>Is the actual frequency, t is time, +.>Is the rated power of the hybrid energy storage device. Wherein the time constantT J May be set by the user. />Is the rate of change of the frequency difference.
In step S1022, if the energy storage control system detects the primary frequency modulation input signal, the energy storage control system controls the primary frequency modulation control module to operate, and if the primary frequency modulation control module determines that the slip or the frequency difference exceeds the corresponding dead zone, the energy storage control system enters a primary frequency modulation mode.
In step S1022, the energy storage response requirement in the primary frequency modulation mode is a second energy storage response requirement, which may be calculated by the primary frequency modulation control module.
In step S1022, obtaining the second energy storage response requirement in the mode based on the actual rotation speed, the actual frequency, the rated rotation speed, the rated frequency, the slip dead zone, the frequency slip dead zone and the real-time load of the unit includes: if the slip or the frequency difference exceeds the corresponding dead zone, obtaining a slip per unit value based on the actual rotating speed and the rated rotating speed; obtaining a frequency difference per unit value based on the actual frequency and the rated frequency; and determining the maximum value of the slip per unit value and the frequency difference per unit value, and calculating based on the maximum value to obtain the second energy storage response requirement.
Wherein, calculate based on maximum value and obtain the second energy storage response demand, include: subtracting the dead zone per unit value from the maximum value, and then performing frequency difference amplification to obtain power corresponding to the deviation; and subtracting the real-time load of the unit from the corresponding power of the deviation to obtain a second energy storage response requirement.
Taking an example that the rated rotation speed is 3000 rpm, the rated frequency is 50Hz, and the slip or the frequency difference exceeds the corresponding dead zone, fig. 2 is a flow chart of a method for acquiring the second energy storage response requirement in the primary frequency modulation mode provided in the embodiment of the present application.
As shown in fig. 2, the actual rotation speed of the unit is subtracted from the rated rotation speed to obtain a slip, the calculated slip is compared with a slip dead zone (generally 2 revolutions/min) set by the system, when the calculated slip exceeds the slip dead zone, the calculated slip is divided by the rated rotation speed to obtain a slip per unit value. The slip per unit value satisfies:where Δn is the per unit value of slip and n (t) is the actual rotational speed.
As shown in fig. 2, the actual frequency of the unit (i.e. the actual frequency of the bus) is subtracted from the rated frequency to obtain a frequency difference, the calculated frequency difference is compared with a frequency difference dead zone (generally 0.033 Hz) set by the system, when the calculated frequency difference exceeds the frequency difference dead zone, and then the calculated frequency difference is divided by the rated frequency to obtain a frequency difference per unit value. The frequency difference per unit value satisfies:where Δf is the per unit value of the frequency difference and f (t) is the actual frequency.
As shown in FIG. 2, the maximum value of the slip per unit value and the frequency difference per unit value, that is. Then subtracting the dead zone per unit value from the maximum value, and then entering a frequency difference amplifying link and power limiting so as to obtain power corresponding to deviation; the deviation corresponds to the power minus the real-time load of the unit to obtain a second energy storage response requirement (also referred to as the power command of the hybrid energy storage device in this mode).
Taking the maximum value as the per unit value of the slip as an example, the power corresponding to the deviation satisfies the following conditions:
wherein P is the power corresponding to the deviation, n (t) is the actual rotation speed, n Dead zone In order to slip the dead zone,to per unit value of slip dead zone, T a To measure the link time constant. K is a primary frequency modulation difference adjustment coefficient of the unit, can be set by a user, and s represents a complex variable.
Taking the maximum value as the per unit value of the frequency difference as an example, the power corresponding to the deviation satisfies the following conditions:
wherein P is the power corresponding to the deviation, f (t) is the actual frequency, f Dead zone As the frequency difference dead zone,is the per unit value of the frequency difference dead zone, T a To measure the link time constant. K is a primary frequency modulation difference adjustment coefficient of the unit, can be set by a user, and s represents a complex variable.
If the slip and the frequency difference do not exceed the corresponding dead zone, the primary frequency modulation mode is not entered, and if one of the slip and the frequency difference exceeds the corresponding dead zone and the other does not exceed the corresponding dead zone, the corresponding deviation corresponding power is obtained by directly utilizing the deviation type exceeding the corresponding dead zone.
In step S1022, a second energy storage response requirementThe method meets the following conditions: />Wherein, P is the power corresponding to the deviation, and P (t) is the real-time load of the unit (also called real-time power of the unit or actual output of the unit).
In step S1023, if the energy storage control system detects the AGC instruction, the energy storage control system controls to start the secondary fm control module to enter the secondary fm mode. Wherein the AGC instruction carries a load response requirement.
In step S1023, the energy storage response requirement in the secondary frequency modulation mode is a third energy storage response requirement, which may be calculated by the secondary frequency modulation control module.
In step S1023, obtaining a third energy storage response requirement in the mode based on the AGC instruction and the real-time load of the unit includes: acquiring energy storage deviation based on load response requirements and real-time load of the unit; and delaying the energy storage deviation amount and performing power limiting to obtain a third energy storage response requirement.
Fig. 3 is a control flow of secondary frequency modulation according to an embodiment of the present application.
As shown in fig. 3, the issued AGC instructions are scheduled to a Load Management Control Center (LMCC), which then distributes the AGC instructions to the oven master and the energy storage control system. The main controller of the machine furnace outputs force according to a coordinated control system of the thermal power unit through a boiler sub-control system and a steam turbine sub-control system, wherein the boiler and the steam turbine operate under the control of the boiler sub-control system and the steam turbine sub-control system, the actual output force of the unit is obtained based on the boiler and the steam turbine, the actual output force of the unit is sent to an energy storage secondary frequency modulation module (also called a secondary frequency modulation control module), the energy storage secondary frequency modulation module also receives an AGC instruction forwarded by the energy storage control system, and the energy storage secondary frequency modulation module obtains a third energy storage response requirement under the mode based on the AGC instruction and the real-time load of the unit.
Fig. 4 is a flowchart of a method for obtaining a third energy storage response requirement in the secondary frequency modulation mode according to an embodiment of the present application.
As shown in fig. 4, the energy storage secondary frequency modulation module subtracts the load response requirement carried by the AGC instruction from the real output force (also called the real power) of the unit acquired in real time to obtain the energy storage deviation value, and multiplies the energy storage deviation value by the delay linkWherein T is b In order to measure the delay time constant, the power limiting is controlled to be the maximum adjustable energy storage through the power limiting, the self-adaptive correction is carried out according to the energy storage state acquired by the energy storage control system, and finally the third energy storage response requirement (also called as the energy storage frequency modulation instruction in the mode) is obtained
And step S103, constructing an objective function and constraint conditions based on the unit power cost and the distributed power corresponding to the flywheel, the super capacitor and the lithium battery.
In step S103, the objective function is the product sum of the unit power costs corresponding to the flywheel, the super capacitor and the lithium battery and the corresponding distributed power.
In step S103, under different modes, the sum of the allocated powers corresponding to the flywheel, the super capacitor and the lithium battery in the constraint condition is equal to the energy storage response requirement under the corresponding mode.
Specifically, in step S103, the optimal economic power distribution module distributes the energy storage response demands according to the following method, taking into account the energy storage response demands obtained according to the above 3 modes. The hybrid energy storage device is divided into a flywheel, a super capacitor and a lithium battery as an example, and corresponding unit power costs are respectively C1, C2 and C3, and the values can be set by a user. The three stored power distributions are P1, P2, P3. The objective function and constraints satisfy:
the objective function is:
the constraint conditions are as follows:
wherein, when the unit is in different modes, P Instructions for And (3) calculating the energy storage response requirement under the corresponding mode in the step S102. P (P) Flywheel availability For maximum allowable power of flywheel, P Super capacity availability Maximum allowable power of super capacitor, P Lithium battery availability The maximum allowable power of the lithium battery.
And step S104, under different modes, solving an optimal solution with the minimum objective function when constraint conditions are met, wherein the optimal solution comprises an optimal solution for distributing power corresponding to the flywheel, the super capacitor and the lithium battery, and the flywheel, the super capacitor and the lithium battery are respectively controlled to respond based on the optimal solution.
In step S104, P1, P2, and P3 in step S103 when y is the smallest are the powers (i.e., optimal solutions) to be distributed by the flywheel, the super capacitor, and the lithium battery. And then respectively controlling the flywheel, the super capacitor and the lithium battery to respond according to the optimal solution of the flywheel distributed power, the optimal solution of the super capacitor distributed power and the optimal solution of the lithium battery distributed power. Therefore, the optimal benefit under different time scales is realized.
In order to realize the embodiment, the application also provides a novel thermal power coupling energy storage multi-time scale coordination control system, and a hybrid energy storage device configured in a thermal power plant comprises a flywheel, a super capacitor and a lithium battery.
Fig. 5 is a block diagram of a novel thermal power coupling energy storage multi-time scale coordination control system provided in an embodiment of the present application.
As shown in fig. 5, the novel thermal power coupling energy storage multi-time scale coordination control system comprises:
the energy storage control system is used for acquiring the operation parameters of the unit and the power grid instruction in real time, wherein the operation parameters comprise actual rotation speed, actual frequency, slip, frequency difference, slip change rate, frequency difference change rate and real-time load of the unit, and the power grid instruction comprises an AGC instruction and a primary frequency modulation input signal issued by the power grid;
the functional module is used for calculating and obtaining energy storage response requirements of the unit in any one mode of a rotational inertia control mode, a primary frequency modulation mode and a secondary frequency modulation mode based on the acquired operation parameters and power grid instructions;
the optimal economic power distribution module is used for constructing an objective function and constraint conditions based on unit power cost and distribution power corresponding to the flywheel, the super capacitor and the lithium battery, wherein under different modes, the sum of the distribution power corresponding to the flywheel, the super capacitor and the lithium battery in the constraint conditions is equal to the energy storage response requirement under the corresponding mode; under different modes, when constraint conditions are met, solving an optimal solution with the minimum objective function, wherein the optimal solution comprises an optimal solution for distributing power corresponding to the flywheel, the super capacitor and the lithium battery, and the flywheel, the super capacitor and the lithium battery are respectively controlled to respond based on the optimal solution.
Further, in one possible implementation manner of the embodiment of the present application, as shown in fig. 5, the functional module includes:
the rotational inertia control module is used for obtaining a first energy storage response requirement under a rotational inertia control mode based on rated power, actual frequency and rated frequency of the hybrid energy storage device;
the primary frequency modulation control module is used for obtaining a second energy storage response requirement under a primary frequency modulation mode based on the actual rotating speed, the actual frequency, the rated rotating speed, the rated frequency, the slip dead zone, the frequency slip dead zone and the real-time load of the unit;
and the secondary frequency modulation control module is used for obtaining a third energy storage response requirement under the secondary frequency modulation mode based on the AGC instruction and the real-time load of the unit.
Further, in one possible implementation of the embodiments of the present application, the slip and the slip change rate meeting the first set condition means that the slip is within the set slip range and the slip change rate is not equal to zero; the fact that the frequency difference and the frequency difference change rate meet the second set condition means that the frequency difference is located in a set frequency difference range and the frequency difference change rate is not equal to zero.
Further, in one possible implementation of the embodiments of the present application, the first energy storage response requirement satisfies:wherein->In response to the demand for the first stored energy,T J is a set time constant, +.>Is the rated frequency of the unit, < >>Is the actual frequency, t is time, +.>Is the rated power of the hybrid energy storage device.
Further, in one possible implementation manner of the embodiment of the present application, the primary frequency modulation control module is specifically configured to: if the slip or the frequency difference exceeds the corresponding dead zone, obtaining a slip per unit value based on the actual rotating speed and the rated rotating speed; obtaining a frequency difference per unit value based on the actual frequency and the rated frequency; and determining the maximum value of the slip per unit value and the frequency difference per unit value, and calculating based on the maximum value to obtain the second energy storage response requirement.
Further, in one possible implementation manner of the embodiment of the present application, in the primary frequency modulation control module, the calculating, based on the maximum value, the second energy storage response requirement includes: subtracting the dead zone per unit value from the maximum value, and then performing frequency difference amplification to obtain power corresponding to the deviation; and subtracting the real-time load of the unit from the corresponding power of the deviation to obtain a second energy storage response requirement.
Further, in one possible implementation manner of the embodiment of the present application, the AGC instruction carries a load response requirement, and the secondary frequency modulation control module is specifically configured to: acquiring energy storage deviation based on load response requirements and real-time load of the unit; and delaying the energy storage deviation amount and performing power limiting to obtain a third energy storage response requirement.
Further, in one possible implementation manner of the embodiment of the present application, in the optimal economic power distribution module, the objective function is a product sum of unit power costs corresponding to the flywheel, the super capacitor and the lithium battery and corresponding distributed power.
It should be noted that the foregoing explanation of the embodiment of the novel thermal power coupling energy storage multi-time scale coordination control method is also applicable to the novel thermal power coupling energy storage multi-time scale coordination control system of the embodiment, and will not be repeated herein.
In the embodiment of the application, the operation parameters of the unit and the power grid instruction are obtained in real time, wherein the operation parameters comprise actual rotation speed, actual frequency, slip, frequency difference, slip change rate, frequency difference change rate and real-time load of the unit, and the power grid instruction comprises an AGC instruction and a primary frequency modulation input signal issued by a power grid; based on the acquired operation parameters and the power grid instruction, calculating and acquiring an energy storage response requirement of the unit in any one mode of a rotational inertia control mode, a primary frequency modulation mode and a secondary frequency modulation mode; constructing an objective function and constraint conditions based on unit power cost and distribution power corresponding to the flywheel, the super capacitor and the lithium battery, wherein under different modes, the sum of the distribution power corresponding to the flywheel, the super capacitor and the lithium battery in the constraint conditions is equal to the energy storage response requirement under the corresponding mode; under different modes, when constraint conditions are met, solving an optimal solution with the minimum objective function, wherein the optimal solution comprises an optimal solution for distributing power corresponding to the flywheel, the super capacitor and the lithium battery, and the flywheel, the super capacitor and the lithium battery are respectively controlled to respond based on the optimal solution. Under the condition, integrating the actual rotating speed, the actual frequency, the slip, the frequency difference, the slip change rate, the frequency difference change rate, the real-time load of the units, and the AGC instruction issued by the power grid, the operation parameters of a plurality of units of primary frequency modulation input signals and the power grid instruction to calculate and obtain the energy storage response requirement of the units in any one mode of a rotational inertia control mode, a primary frequency modulation mode and a secondary frequency modulation mode; and constructing an objective function and constraint conditions based on the unit power cost and the distributed power corresponding to the flywheel, the super capacitor and the lithium battery and the response requirements under different modes, so as to obtain an optimal solution of the minimum objective function under different modes, further realize optimal control of the flywheel, the super capacitor and the lithium battery under different modes based on the optimal solution, realize control of multiple time scales, and have the minimum cost, namely the maximum benefit under each mode, thereby improving the benefit of energy storage control.
The method is a thermal power coupling energy storage multi-time scale coordination control method, and can enable a thermal power unit to provide inertia support, primary frequency modulation and secondary frequency modulation services for a power grid in three phases of frequency change, so that service benefit is obtained. By adopting the coordination control method, auxiliary services are provided in three stages of frequency change of the unit, and the operation cost of energy storage of the unit is minimized. The method can exert the potential of thermal power coupling energy storage to the maximum extent, so that the thermal power coupling energy storage device can provide rotary inertia, primary frequency modulation and secondary frequency modulation auxiliary services at three stages of frequency change, obtain the maximum economic benefit for a unit, and meanwhile, the frequency stability of a novel power system can be improved, and the smiler ratio of new energy sources is improved.
In order to achieve the above embodiments, the present application further proposes an electronic device including: a processor, a memory communicatively coupled to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the methods provided by the previous embodiments.
In order to implement the above embodiment, the present application further proposes a computer-readable storage medium, in which computer-executable instructions are stored, which when executed by a processor are configured to implement the method provided in the foregoing embodiment.
In order to implement the above embodiments, the present application also proposes a computer program product comprising a computer program which, when executed by a processor, implements the method provided by the above embodiments.
The processes of collecting, storing, using, processing, transmitting, providing, disclosing and the like of the information related to the application all accord with the regulations of the related laws and regulations and do not violate the well-known and popular regulations.
It should be noted that information should be collected for legitimate and reasonable uses and not shared or sold outside of these legitimate uses. In addition, such collection/sharing should be performed after receiving user informed consent, including but not limited to informing the user to read user agreements/user notifications and signing agreements/authorizations including authorization-related user information before the user uses the functionality. In addition, any necessary steps are taken to safeguard and ensure access to such information data and to ensure that other persons having access to the information data adhere to their privacy policies and procedures.
In the foregoing descriptions of embodiments, descriptions of the terms "one embodiment," "some embodiments," "example," "particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (10)
1. The novel thermal power coupling energy storage multi-time scale coordination control method is characterized in that a hybrid energy storage device configured in a thermal power plant comprises a flywheel, a super capacitor and a lithium battery, and the coordination control method comprises the following steps:
acquiring operation parameters of a unit and a power grid instruction in real time, wherein the operation parameters comprise an actual rotating speed, an actual frequency, slip, frequency difference, slip change rate, frequency difference change rate and real-time load of the unit, and the power grid instruction comprises an AGC instruction and a primary frequency modulation input signal issued by a power grid;
based on the acquired operation parameters and the power grid instruction, calculating and acquiring an energy storage response requirement of the unit in any one mode of a rotational inertia control mode, a primary frequency modulation mode and a secondary frequency modulation mode;
constructing an objective function and constraint conditions based on unit power cost and distribution power corresponding to the flywheel, the super capacitor and the lithium battery, wherein under different modes, the sum of the distribution power corresponding to the flywheel, the super capacitor and the lithium battery in the constraint conditions is equal to the energy storage response requirement under the corresponding mode;
under different modes, when constraint conditions are met, solving an optimal solution with the minimum objective function, wherein the optimal solution comprises an optimal solution for distributing power corresponding to the flywheel, the super capacitor and the lithium battery, and the flywheel, the super capacitor and the lithium battery are respectively controlled to respond based on the optimal solution.
2. The novel thermal power coupling energy storage multi-time scale coordination control method according to claim 1, wherein the calculating to obtain the energy storage response requirement of the unit in any one of a rotational inertia control mode, a primary frequency modulation mode and a secondary frequency modulation mode based on the acquired operation parameters and the power grid instruction comprises:
if the slip and the slip change rate meet the first set condition or the frequency difference and the frequency difference change rate meet the second set condition, entering a moment of inertia control mode; obtaining a first energy storage response requirement under the mode based on rated power, actual frequency and rated frequency of the unit of the hybrid energy storage device;
if the primary frequency modulation input signal is detected and the slip or the frequency difference exceeds the corresponding dead zone, entering a primary frequency modulation mode; obtaining a second energy storage response requirement under the mode based on the actual rotating speed, the actual frequency, the rated rotating speed, the rated frequency, the slip dead zone, the frequency slip dead zone and the real-time load of the unit;
if the AGC command is detected, a secondary frequency modulation mode is entered; and obtaining a third energy storage response requirement under the mode based on the AGC instruction and the real-time load of the unit.
3. The novel thermal power coupling energy storage multi-time scale coordinated control method according to claim 2, wherein the first energy storage response requirement satisfies:
in the method, in the process of the invention,in response to the demand for the first stored energy,T J is a set time constant, +.>Is the rated frequency of the unit, < >>Is the actual frequency, t is time, +.>Is the rated power of the hybrid energy storage device.
4. The novel thermal power coupling energy storage multi-time scale coordination control method according to claim 2, wherein the obtaining the second energy storage response requirement under the mode based on the actual rotation speed, the actual frequency, the rated rotation speed, the rated frequency, the slip dead zone, the frequency slip dead zone and the real-time load of the unit comprises the following steps:
if the slip or the frequency difference exceeds the corresponding dead zone, obtaining a slip per unit value based on the actual rotating speed and the rated rotating speed; obtaining a frequency difference per unit value based on the actual frequency and the rated frequency; and determining the maximum value in the slip per unit value and the frequency difference per unit value, and calculating to obtain a second energy storage response requirement based on the maximum value.
5. The novel thermal power coupling energy storage multi-time scale coordination control method according to claim 4, wherein the calculating based on the maximum value obtains a second energy storage response requirement, and the method comprises the following steps:
subtracting the dead zone per unit value from the maximum value, and then performing frequency difference amplification to obtain power corresponding to deviation;
and the deviation corresponds to the power minus the real-time load of the unit to obtain a second energy storage response requirement.
6. The novel thermal power coupling energy storage multi-time scale coordination control method according to claim 2, wherein the AGC instruction carries a load response requirement, the obtaining of the third energy storage response requirement in the mode based on the AGC instruction and the real-time load of the unit comprises:
acquiring an energy storage deviation amount based on the load response requirement and the real-time load of the unit;
and delaying and limiting the energy storage deviation amount to obtain a third energy storage response requirement.
7. The novel thermal power coupling energy storage multi-time scale coordination control method according to claim 1, wherein the objective function is the product sum of unit power cost corresponding to a flywheel, a super capacitor and a lithium battery and corresponding distributed power.
8. Novel thermal power coupling energy storage multi-time scale coordination control system, its characterized in that, the hybrid energy storage device of thermal power plant configuration includes flywheel, super capacitor and lithium cell, coordination control system includes:
the energy storage control system is used for acquiring the operation parameters of the unit and the power grid instruction in real time, wherein the operation parameters comprise the actual rotation speed, the actual frequency, the slip, the frequency difference, the slip change rate, the frequency difference change rate and the real-time load of the unit, and the power grid instruction comprises an AGC instruction and a primary frequency modulation input signal issued by the power grid;
the functional module is used for calculating and obtaining energy storage response requirements of the unit in any one mode of a rotational inertia control mode, a primary frequency modulation mode and a secondary frequency modulation mode based on the acquired operation parameters and power grid instructions;
the optimal economic power distribution module is used for constructing an objective function and constraint conditions based on unit power cost and distribution power corresponding to the flywheel, the super capacitor and the lithium battery, wherein under different modes, the sum of the distribution power corresponding to the flywheel, the super capacitor and the lithium battery in the constraint conditions is equal to the energy storage response requirement under the corresponding mode; under different modes, when constraint conditions are met, solving an optimal solution with the minimum objective function, wherein the optimal solution comprises an optimal solution for distributing power corresponding to the flywheel, the super capacitor and the lithium battery, and the flywheel, the super capacitor and the lithium battery are respectively controlled to respond based on the optimal solution.
9. An electronic device, comprising: a processor, and a memory communicatively coupled to the processor;
the memory stores computer-executable instructions;
the processor executes computer-executable instructions stored in the memory to implement the method of any one of claims 1-7.
10. A computer readable storage medium having stored therein computer executable instructions which when executed by a processor are adapted to carry out the method of any one of claims 1-7.
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