CN113922391A - Control method for primary frequency modulation of flywheel energy storage auxiliary thermal power generating unit - Google Patents
Control method for primary frequency modulation of flywheel energy storage auxiliary thermal power generating unit Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Abstract
The invention discloses a control method for primary frequency modulation of a flywheel energy storage auxiliary thermal power generating unit, which belongs to the technical field of thermal power generating unit control, and is characterized in that the load characteristic of flywheel energy storage is utilized, when frequency modulation and load reduction are needed in power grid frequency modulation, a motor in a flywheel energy storage system is used as a motor to accelerate a flywheel, electric energy is converted into mechanical energy, and therefore the load of the unit is reduced; when the power grid frequency modulation needs to be increased in load, the motor in the flywheel energy storage system is used as a generator to convert the mechanical energy of the flywheel into electric energy by utilizing the quick discharge function of the flywheel energy storage system, and the electric energy is supplied to the outside, so that the load of the unit is increased, the primary frequency modulation performance of the unit does not depend on a steam turbine self-regulating system to directly and automatically regulate a steam turbine regulating valve to complete primary frequency modulation response, the service life of steam turbine generator unit equipment is prolonged, and the economy of a thermal generator unit is enhanced.
Description
Technical Field
The invention relates to the technical field of thermal power unit control, in particular to a control method for assisting primary frequency modulation of a thermal power unit through flywheel energy storage.
Background
The primary frequency modulation function of the thermal power generating unit plays an important role in maintaining the stability of the power grid, and along with the construction of a novel power system taking new energy as a main body, the power grid also provides higher requirements for the primary frequency modulation performance of the thermal power generating unit. The traditional primary frequency modulation of the thermal power generating unit is usually realized by adjusting the opening degree of a steam turbine regulating valve and utilizing the heat storage of a boiler to quickly respond to the change of the frequency of a power grid. For the stability of the power grid and the safe operation of the thermal power generating unit, the thermal power generating unit is gradually matched with an energy storage system to assist the power grid to carry out frequency modulation service. The flywheel energy storage has the advantages of high response speed, high efficiency, long service life, environment friendliness and the like, and is very suitable for adjusting the primary frequency modulation caused by rapid load disturbance, so that the flywheel energy storage is generated as a device for frequency modulation of a newly-developed auxiliary thermal power generating unit at the moment, such as: a primary frequency modulation control device of a thermal power generating unit based on flywheel energy storage is disclosed in patent document No. CN110571833B, but a control method for primary frequency modulation of a flywheel energy storage-assisted thermal power generating unit is not available.
Disclosure of Invention
The invention aims to provide a control method for primary frequency modulation of a flywheel energy storage auxiliary thermal power generating unit, when the frequency modulation of a power grid needs frequency modulation and load reduction, a motor in a flywheel energy storage system is used as a motor to accelerate a flywheel by utilizing the quick charging function of flywheel energy storage, and electric energy is converted into mechanical energy, so that the load of the unit is reduced; when the frequency modulation of the power grid needs to increase the load, the motor in the flywheel energy storage system is used as a generator to convert the mechanical energy of the flywheel into electric energy by utilizing the quick discharge function of the flywheel energy storage system, and the electric energy is supplied to the outside, so that the load of the unit is increased.
In order to achieve the purpose, the invention adopts the following technical scheme: the control method for the primary frequency modulation of the flywheel energy storage auxiliary thermal power generating unit is characterized by comprising the following steps:
step 1: detecting the current actual frequency of the power grid;
step 2: when the current actual frequency of the power grid exceeds the standard frequency of the power grid, triggering the frequency modulation load shedding action of a primary frequency modulation system of the thermal power generating unit; when the current actual frequency of the power grid is lower than the standard frequency of the power grid, triggering frequency modulation load increasing action of a primary frequency modulation system of the thermal power generating unit, and generating a frequency modulation load demand instruction;
and step 3: when the primary frequency modulation action increases the load, judging whether the flywheel energy storage has a discharge condition, if so, executing the flywheel energy storage discharge action, transmitting the difference part of the frequency modulation load demand instruction to a primary frequency modulation system of the thermal power unit, and using the corrected unit frequency modulation load instruction to replace a frequency modulation load instruction in the primary frequency modulation control system of the original unit for control, wherein the difference part is adjusted by the thermal power unit, and if not, performing frequency modulation control through the primary frequency modulation system of the thermal power unit; the difference part is the difference between the demand of the frequency modulation load of the unit and the load provided by the flywheel energy storage system;
when the primary frequency modulation action is carried out to reduce the load, judging whether the flywheel energy storage has a charging condition, if so, executing the flywheel energy storage charging action, sending the difference part of the frequency modulation load demand instruction to a primary frequency modulation system of the thermal power generating unit, and controlling by using the corrected unit frequency modulation load instruction to replace a frequency modulation load instruction in a primary frequency modulation control system of the original unit, wherein the difference part is adjusted by the thermal power generating unit, and if not, carrying out frequency modulation control by the primary frequency modulation system of the thermal power generating unit; the difference part is the difference between the demand of the frequency modulation load of the unit and the load provided by the flywheel energy storage system.
Further, the triggering process of the flywheel energy storage discharging action is as follows:
triggering flywheel energy storage discharge allowance when five conditions of primary frequency modulation function input, flywheel energy storage auxiliary frequency modulation input, good power grid frequency signal quality, and switching-on state of a high-voltage cabinet of an energy storage system and flywheel rotating speed greater than 90% of rated rotating speed are simultaneously met;
when the two conditions of the frequency modulation load increasing action and the flywheel energy storage discharging permission are simultaneously met, the flywheel energy storage discharging action is triggered.
Further, the triggering process of the flywheel energy storage charging action is as follows:
triggering flywheel energy storage charging permission when five conditions of primary frequency modulation function input, flywheel energy storage auxiliary frequency modulation input, good power grid frequency signal quality, and switching-on state of a high-voltage cabinet of an energy storage system and flywheel rotating speed less than 10% of rated rotating speed are simultaneously met;
and triggering the flywheel energy storage charging action when the frequency modulation load reduction action and the flywheel energy storage charging permission conditions are simultaneously met.
Further, the unit frequency modulation load instruction correction process is as follows:
when the flywheel energy storage cannot provide the frequency modulation load, the corrected unit frequency modulation load instruction is the frequency modulation load demand instruction generated in the step 1;
when the flywheel energy storage can provide frequency modulation load, if frequency modulation load increase is carried out, the corrected unit frequency modulation load instruction is the frequency modulation load demand instruction obtained in the step 1 minus the flywheel energy storage output power, and the lower output limit is set to be 0; and if the frequency modulation load is reduced, the corrected frequency modulation load instruction of the unit is the frequency modulation load demand instruction in the step 1 plus the energy storage output power of the flywheel, and the upper output limit is set to be 0.
Further, the frequency modulation load demand instruction generated in step 1 is Δ P:
wherein: delta is the rotating speed unequal rate; delta f is a frequency difference, namely the difference between the current actual frequency of the power grid and the standard frequency of the power grid; pn is rated capacity of the thermal power generating unit.
Through the design scheme, the invention can bring the following beneficial effects:
the control method for the primary frequency modulation of the flywheel energy storage auxiliary thermal power generating unit provided by the invention gives an efficient and feasible control method by fully considering the primary frequency modulation requirement of the unit, combining the characteristics and the operation mode of flywheel energy storage equipment and considering the performance index of the primary frequency modulation. The method comprises the steps that a flywheel energy storage system firstly judges primary frequency modulation action conditions, whether the flywheel energy storage has discharge conditions or not is judged when primary frequency modulation action increases load, if the flywheel energy storage meets the discharge conditions, the flywheel energy storage carries out a thorough discharge process, the difference part of frequency modulation load demand instructions is sent to a primary frequency modulation system of a thermal power generating unit, the corrected unit frequency modulation load instructions replace frequency modulation instructions in an original system to be controlled, the difference part is adjusted by the thermal power generating unit, and if the discharge conditions are not met, frequency modulation control is carried out through the primary frequency modulation system of the thermal power generating unit; and when the load is reduced by the primary frequency modulation action, judging whether the flywheel energy storage has a charging condition, if so, carrying out a thorough charging process on the flywheel energy storage, sending the difference part of the frequency modulation load demand instruction to a primary frequency modulation system of the thermal power generating unit, and controlling by replacing a frequency modulation instruction in the original system with the corrected unit frequency modulation load instruction, wherein the difference part is adjusted by the thermal power generating unit, and if not, carrying out frequency modulation control by the primary frequency modulation system of the thermal power generating unit.
In conclusion, by utilizing the load characteristic of flywheel energy storage, when the frequency modulation of a power grid needs to be performed and the load is reduced, the motor in the flywheel energy storage system is used as a motor to accelerate the flywheel by utilizing the quick charging function of the flywheel energy storage, and the electric energy is converted into mechanical energy, so that the load of a unit is reduced; when the power grid frequency modulation needs to be increased in load, the motor in the flywheel energy storage system is used as a generator to convert the mechanical energy of the flywheel into electric energy by utilizing the quick discharge function of the flywheel energy storage system, and the electric energy is supplied to the outside, so that the load of the unit is increased, the primary frequency modulation performance of the unit does not depend on a steam turbine self-regulating system to directly and automatically regulate a steam turbine regulating valve to complete primary frequency modulation response, the service life of steam turbine generator unit equipment is prolonged, and the economy of a thermal generator unit is enhanced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limitation and are not intended to limit the invention in any way, and in which:
FIG. 1 is a block diagram of a flywheel energy storage system;
FIG. 2 is a schematic diagram of a flywheel energy storage primary frequency modulation action judgment logic;
FIG. 3 is a schematic diagram of a flywheel charge/storage permission determination logic;
FIG. 4 is a schematic diagram of a flywheel charge/discharge permission determination logic;
FIG. 5 is a schematic diagram of a flywheel energy storage charging/discharging operation judgment logic;
fig. 6 is a schematic diagram of a thermal power generating unit frequency modulation load instruction correction logic.
In the figure: the system comprises a first subtractor module, a 2-primary frequency modulation compensation function module, a 3-high limit judgment module, a 4-low limit judgment module, a 5-first AND module, a 6-second AND module, a 7-third AND module, a 8-fourth AND module, a 9-OR module, a 10-second subtractor module, a 11-high selection module, a 12-third subtractor module, a 13-low selection module, a 14-first selection module and a 15-second selection module.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the present invention is not limited by the following examples, and specific embodiments can be determined according to the technical solutions and practical situations of the present invention. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention. In the description of the present invention, it is to be understood that the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and that the features defined as "first", "second", "third" and "fourth" do not denote any order, quantity or importance, but rather are used to distinguish one element from another.
The control method for the primary frequency modulation of the flywheel energy storage auxiliary thermal power generating unit provided by the invention gives an efficient and feasible control method by fully considering the primary frequency modulation requirement of the unit, combining the characteristics and the operation mode of flywheel energy storage equipment and considering the performance index of the primary frequency modulation. As shown in fig. 1, the flywheel energy storage system mainly comprises three parts, namely a flywheel, a motor and a power electronic conversion device, and the working principle of flywheel energy storage is that under the condition of abundant electric power, the flywheel is driven to rotate at a high speed by electric energy, and the electric energy is converted into mechanical energy to be stored; when the system needs, the flywheel decelerates, the motor operates as a generator, and the kinetic energy of the flywheel is converted into electric energy for users to use. The flywheel energy storage realizes the storage and release of electric energy through the acceleration and deceleration of the rotor. The flywheel energy storage system firstly judges the primary frequency modulation action condition, judges whether the flywheel energy storage has the discharge condition when the primary frequency modulation action increases the load, if the discharge condition is met, the flywheel energy storage carries out the complete discharge process (the flywheel energy storage charging action refers to the complete charge process of the flywheel energy storage system, the flywheel energy storage power generation action refers to the complete discharge process of the flywheel energy storage system), and transmits the difference part of the frequency modulation load demand instruction (the difference part of the frequency modulation load demand instruction refers to the difference between the frequency modulation demand of the unit and the load provided by the flywheel energy storage system, the specific implementation process is shown in figure 6) to the primary frequency modulation system of the thermal power unit, the frequency modulation load instruction of the corrected unit replaces the frequency modulation load instruction in the original system (namely the primary frequency modulation control system of the original unit) to control, and the difference part is adjusted by the thermal power unit, if the discharge condition is not met, carrying out frequency modulation control through a primary frequency modulation system of the thermal power generating unit; when the primary frequency modulation action is carried out to reduce the load, whether the flywheel energy storage has the charging condition or not is judged, if the flywheel energy storage meets the charging condition, the flywheel energy storage is completely charged, the difference part of the frequency modulation load demand instruction is sent to a primary frequency modulation system of the thermal power generating unit, the corrected unit frequency modulation load instruction replaces a frequency modulation load instruction in an original system (namely the original unit primary frequency modulation control system) to carry out control, the difference part is adjusted by the thermal power generating unit, and if the charging condition is not met, the frequency modulation control is carried out through the primary frequency modulation system of the thermal power generating unit.
The control logic of the primary frequency modulation of the flywheel energy storage auxiliary thermal power generating unit comprises four parts:
firstly, judging logic of flywheel energy storage primary frequency modulation action, as shown in fig. 2, detecting actual frequency of a power grid; when the actual frequency of the power grid exceeds the standard frequency of the power grid, triggering the frequency modulation load shedding action of a primary frequency modulation system of the thermal power generating unit; and when the current frequency of the power grid is lower than the standard frequency of the power grid, triggering the frequency modulation load increasing action of a primary frequency modulation system of the thermal power generating unit, and generating a frequency modulation load demand instruction.
Secondly, flywheel energy storage charging and discharging permission judgment logic, as shown in fig. 3 and 4, when five conditions of primary frequency modulation function input, flywheel energy storage auxiliary frequency modulation input, good power grid frequency signal quality (in the invention, good power grid frequency signal quality means that a signal is in a range, and the change rate is in a required range), the closing state of a high-voltage cabinet of an energy storage system and the rotating speed of a flywheel is less than 10% of a rated rotating speed are simultaneously met, flywheel energy storage charging permission is triggered, and a charging control instruction is executed; when five conditions of primary frequency modulation function input, flywheel energy storage auxiliary frequency modulation input, good quality of a power grid frequency signal (the good quality of the power grid frequency signal in the invention means that the signal is in a measuring range, the change rate is in a required range), the closing state of a high-voltage cabinet of an energy storage system and the rotating speed of a flywheel is greater than 90% of a rated rotating speed are simultaneously met, the flywheel energy storage discharging permission is triggered, and a discharging control instruction is executed.
Thirdly, judging logic of energy storage charging and discharging actions of the flywheel, as shown in fig. 5, when two conditions of frequency modulation load shedding action and flywheel energy storage charging permission are simultaneously met, triggering the energy storage charging action of the flywheel; triggering flywheel energy storage and discharge actions when two conditions of frequency modulation load increasing actions and flywheel energy storage and discharge allowability are simultaneously met; when any condition of the flywheel energy storage charging action and the flywheel energy storage discharging action is met, triggering the flywheel energy storage charging action or triggering the flywheel energy storage discharging action.
Fourthly, the thermal power generating unit frequency modulation load instruction correction logic, as shown in fig. 6, when the flywheel energy storage cannot provide the frequency modulation load, the corrected thermal power generating unit frequency modulation load instruction is the frequency modulation load demand instruction calculated by the first part; when the flywheel energy storage can provide frequency modulation load, if frequency modulation load increase is carried out, the corrected frequency modulation load instruction of the thermal power generating unit is obtained by subtracting the flywheel energy storage output power from the frequency modulation load demand instruction, and in order to avoid the condition that the frequency modulation load demand instruction is smaller than the flywheel energy storage rated output power, the lower output limit is set to be 0; and if the frequency modulation load is reduced, the modified frequency modulation load instruction of the thermal power generating unit is the frequency modulation load demand instruction plus the flywheel energy storage output power, and the output upper limit is set to be 0 in order to avoid the condition that the frequency modulation load demand instruction is smaller than the flywheel energy storage rated output power.
The specific implementation treatment process is as follows:
judgment logic for primary frequency modulation action of flywheel energy storage
Acquiring the actual frequency of a power grid, sending the actual frequency to a first subtracter module 1, subtracting the actual frequency of the power grid from the standard frequency of the power grid of 50Hz through the first subtracter module 1, and generating a frequency difference signal (the frequency difference signal is the frequency difference delta f in the following formula); the frequency difference signal is subjected to correlation calculation through a primary frequency modulation compensation function module 2 to obtain a frequency modulation load demand instruction delta P; the primary frequency modulation compensation function of the primary frequency modulation compensation function module 2 is:
wherein: the delta P is a frequency modulation load demand instruction; delta is the rotating speed unequal rate; Δ f is the frequency difference; pn is rated capacity of the thermal power generating unit; the dead zone of the primary frequency modulation compensation function is +/-2; and the upper and lower output limits of the primary frequency modulation compensation function module 2 are set differently according to different capacities of the thermal power generating unit. The primary frequency modulation compensation function module 2 is used for converting the frequency difference into a load quantity which needs to be adjusted by the unit.
One path of the frequency modulation load demand instruction delta P is sent to a high limit judgment module 3, the high limit judgment module 3 is used for judging the direction of the frequency modulation load as a load increase, and a frequency modulation load increase action instruction is output after passing through the high limit judgment module 3, wherein the high limit value is set to be 0; the frequency modulation load demand instruction delta P is sent to the low limit judgment module 4 all the way, the low limit judgment module 4 is used for judging that the direction of the frequency modulation load is load reduction, and outputting a frequency modulation load reduction action instruction after passing through the low limit judgment module 4, wherein the low limit value is set to be 0.
Second, flywheel energy storage charge and discharge permission judgment logic
The method comprises the steps that a primary frequency modulation function input of a thermal power generating unit, an auxiliary flywheel energy storage frequency modulation input, a power grid frequency signal quality are good (the quality of the power grid frequency signal adopts an output signal of the power grid frequency signal after the power grid frequency signal passes through a system self-provided quality judgment module, specifically, a signal is in a range, a change rate is in a required range), a switching-on state of a high-voltage cabinet of an energy storage system and a flywheel rotating speed is less than 10% of a rated rotating speed, and a flywheel energy storage charging permission signal is output and triggered after calculation through a first and module 5.
The method comprises the steps that a primary frequency modulation function input of a thermal power generating unit, an auxiliary flywheel energy storage frequency modulation input, a power grid frequency signal quality is good (the quality of the power grid frequency signal adopts an output signal of the power grid frequency signal after the power grid frequency signal passes through a system self-provided quality judgment module, specifically, a signal is in a range, a change rate is in a required range), a switching-on state of a high-voltage cabinet of an energy storage system and a flywheel rotating speed greater than 90% of a rated rotating speed are calculated through a second and module 6, and then a flywheel energy storage discharge permission signal is output and triggered.
Third, flywheel energy storage charging and discharging action judgment logic
After the frequency modulation load reducing action signal and the flywheel energy storage charging allowing signal are judged by the third AND module 7, a flywheel energy storage charging action signal is output; after the frequency modulation load increasing action signal and the flywheel energy storage discharge allowing signal are judged by the fourth AND module 8, a flywheel energy storage discharge action signal is output; after the flywheel energy storage charging action signal and the flywheel energy storage discharging action signal pass through the OR module 9, the flywheel energy storage charging action signal or the discharging action signal is output, the flywheel energy storage charging action signal is triggered when the specific frequency modulation load reduction action condition and the flywheel energy storage charging permission condition are met simultaneously, and the flywheel energy storage discharging action signal is triggered when the frequency modulation load increase action condition and the flywheel energy storage discharging permission condition are met simultaneously.
Frequency modulation load instruction correction logic of thermal power generating unit
When the flywheel energy storage charging and discharging does not act, the second selection module 15 selects the input N end as output, and selects the frequency modulation load demand instruction as the modified frequency modulation load instruction of the thermal power generating unit to enter the primary frequency modulation control system of the thermal power generating unit. The second selection module 15 selects the input N terminal as the output purpose, and does not modify the frequency modulation demand instruction when the flywheel energy storage charging and discharging does not act.
When the flywheel stores energy and charges and discharges, different inputs are selected according to the flywheel stores energy and charges and discharges. When the flywheel stores energy and charges, the first selection module 14 selects the input Y end as the output, and the purpose that the first selection module 14 selects the input Y end as the output is to correct the frequency modulation demand instruction when the flywheel stores energy and charges and discharges.
After the frequency modulation load demand instruction and the flywheel energy storage output power pass through the second subtractor module 10, the output is sent to the high selection module 11 together with the constant 0, and the output is used as the Y-end input of the first selection module 14, so that the Y-end input value of the first selection module 14 is ensured to be constantly greater than or equal to 0. When the flywheel stores energy and discharges, the first selection module 14 selects the input N end as output, the output of the frequency modulation load demand instruction and the flywheel stores energy and outputs power after passing through the third subtractor module 12, the output is sent to the low selection module 13 together with the constant 0, the output is used as the N end input of the first selection module 14, and the input value of the N end of the first selection module 14 is ensured to be constantly less than or equal to 0.
Claims (5)
1. The control method for the primary frequency modulation of the flywheel energy storage auxiliary thermal power generating unit is characterized by comprising the following steps:
step 1: detecting the current actual frequency of the power grid;
step 2: when the current actual frequency of the power grid exceeds the standard frequency of the power grid, triggering the frequency modulation load shedding action of a primary frequency modulation system of the thermal power generating unit; when the current actual frequency of the power grid is lower than the standard frequency of the power grid, triggering frequency modulation load increasing action of a primary frequency modulation system of the thermal power generating unit, and generating a frequency modulation load demand instruction;
and step 3: when the primary frequency modulation action increases the load, judging whether the flywheel energy storage has a discharge condition, if so, executing the flywheel energy storage discharge action, transmitting the difference part of the frequency modulation load demand instruction to a primary frequency modulation system of the thermal power unit, and using the corrected unit frequency modulation load instruction to replace a frequency modulation load instruction in the primary frequency modulation control system of the original unit for control, wherein the difference part is adjusted by the thermal power unit, and if not, performing frequency modulation control through the primary frequency modulation system of the thermal power unit; the difference part is the difference between the demand of the frequency modulation load of the unit and the load provided by the flywheel energy storage system;
when the primary frequency modulation action is carried out to reduce the load, judging whether the flywheel energy storage has a charging condition, if so, executing the flywheel energy storage charging action, sending the difference part of the frequency modulation load demand instruction to a primary frequency modulation system of the thermal power generating unit, and controlling by using the corrected unit frequency modulation load instruction to replace a frequency modulation load instruction in a primary frequency modulation control system of the original unit, wherein the difference part is adjusted by the thermal power generating unit, and if not, carrying out frequency modulation control by the primary frequency modulation system of the thermal power generating unit; the difference part is the difference between the demand of the frequency modulation load of the unit and the load provided by the flywheel energy storage system.
2. The method for controlling the primary frequency modulation of the flywheel energy storage auxiliary thermal power generating unit according to claim 1, characterized by comprising the following steps: the triggering process of the flywheel energy storage discharging action is as follows:
triggering flywheel energy storage discharge allowance when five conditions of primary frequency modulation function input, flywheel energy storage auxiliary frequency modulation input, good power grid frequency signal quality, and switching-on state of a high-voltage cabinet of an energy storage system and flywheel rotating speed greater than 90% of rated rotating speed are simultaneously met;
when the two conditions of the frequency modulation load increasing action and the flywheel energy storage discharging permission are simultaneously met, the flywheel energy storage discharging action is triggered.
3. The method for controlling the primary frequency modulation of the flywheel energy storage auxiliary thermal power generating unit according to claim 2, characterized by comprising the following steps: the triggering process of the flywheel energy storage charging action is as follows:
triggering flywheel energy storage charging permission when five conditions of primary frequency modulation function input, flywheel energy storage auxiliary frequency modulation input, good power grid frequency signal quality, and switching-on state of a high-voltage cabinet of an energy storage system and flywheel rotating speed less than 10% of rated rotating speed are simultaneously met;
and triggering the flywheel energy storage charging action when the frequency modulation load reduction action and the flywheel energy storage charging permission conditions are simultaneously met.
4. The method for controlling the primary frequency modulation of the flywheel energy storage auxiliary thermal power generating unit according to claim 3, characterized by comprising the following steps: the correction process of the unit frequency modulation load instruction is as follows:
when the flywheel energy storage cannot provide the frequency modulation load, the corrected unit frequency modulation load instruction is the frequency modulation load demand instruction generated in the step 1;
when the flywheel energy storage can provide frequency modulation load, if frequency modulation load increase is carried out, the corrected unit frequency modulation load instruction is the frequency modulation load demand instruction obtained in the step 1 minus the flywheel energy storage output power, and the lower output limit is set to be 0; and if the frequency modulation load is reduced, the corrected frequency modulation load instruction of the unit is the frequency modulation load demand instruction in the step 1 plus the energy storage output power of the flywheel, and the upper output limit is set to be 0.
5. The method for controlling the primary frequency modulation of the flywheel energy storage auxiliary thermal power generating unit according to claim 4, characterized in that: generating a frequency modulation load demand instruction in the step 1 as delta P:
wherein: delta is the rotating speed unequal rate; delta f is a frequency difference, namely the difference between the current actual frequency of the power grid and the standard frequency of the power grid; pn is rated capacity of the thermal power generating unit.
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