CN115173438B - Frequency modulation system and method for flywheel energy storage auxiliary thermal power for controllable high-voltage plant - Google Patents
Frequency modulation system and method for flywheel energy storage auxiliary thermal power for controllable high-voltage plant 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
- H02J3/28—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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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/02—Additional mass for increasing inertia, e.g. flywheels
- H02K7/025—Additional mass for increasing inertia, e.g. flywheels for power storage
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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- 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
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Abstract
The application relates to a frequency modulation system and a method for a controllable high-voltage plant flywheel energy storage auxiliary thermal power, wherein the system comprises: the system comprises a power supply unit for the power plant and a controllable high-voltage plant flywheel energy storage unit, wherein the power supply unit for the power plant is connected with the controllable high-voltage plant flywheel energy storage unit; the power supply unit for the power plant is used for adjusting the charging and discharging power of the controllable high-voltage plant flywheel energy storage unit according to a frequency modulation instruction; the controllable high-voltage station flywheel energy storage unit comprises a power supply and electric energy conversion module, and the power supply and electric energy conversion module is used for responding to the charging and discharging power regulation of the power station power supply unit. According to the technical scheme, the controllable high-voltage station flywheel energy storage unit is connected into the power supply unit for the power station, the combined generator set can participate in a response power grid frequency modulation adjusting process, the frequency modulation instruction can be responded quickly, and the safety of the system is improved.
Description
Technical Field
The application relates to the technical field of frequency modulation, in particular to a frequency modulation system and method for a controllable high-voltage plant flywheel energy storage auxiliary thermal power.
Background
In recent years, with the development of the energy storage industry, various novel energy storage technologies are continuously broken through, and demonstration applications are realized in more and more scenes, wherein the novel energy storage technologies mainly comprise a heat storage technology, a hydrogen energy storage technology, an electromagnetic energy storage technology, a flywheel energy storage technology and the like. With the increase of the grid-connected quantity of wind power and photovoltaic power, the rapid development of interconnected large power grids, large-capacity power generation and long-distance power transmission, the adjustment task of a power system is heavier. The energy storage unit is used as a power supply capable of being charged and discharged flexibly, can realize dynamic energy absorption and release in a power grid, and has the advantages of replacement or not in maintaining the voltage stability of the power grid due to quick response and flexible control.
At present in the frequency modulation field, mostly adopt the concentrated change of current mode, need the energy storage to step up the transformer and be connected to the section for the thermal power unit high-pressure plant, the frequency modulation is more loaded down with trivial details, and the concentrated change of current mode is because with energy storage battery through the series-parallel connection in the direct current side simultaneously, if single battery module goes wrong, the short board effect aggravation of cask, direct current circulation efficiency reduces, and different electric cores exert oneself the inequality/partial electric core decay is too fast/the temperature rise is too high for current frequency modulation response is slower and the security is not high.
Disclosure of Invention
The application provides a frequency modulation system and a frequency modulation method for a controllable high-voltage station flywheel energy storage auxiliary thermal power, and aims to at least solve the technical problems of slow frequency modulation response and low safety in the related technology.
The embodiment of the first aspect of this application provides a controllable high pressure mill assists frequency modulation system of thermoelectricity with flywheel energy storage, includes:
the system comprises a power supply unit for the power plant and a controllable high-voltage plant flywheel energy storage unit, wherein the power supply unit for the power plant is connected with the controllable high-voltage plant flywheel energy storage unit;
the power supply unit for the power plant is used for adjusting the charging and discharging power of the controllable high-voltage plant flywheel energy storage unit according to a frequency modulation instruction;
the controllable high-voltage plant flywheel energy storage unit comprises a power supply electric energy conversion module, and the power supply electric energy conversion module is used for responding to charge and discharge power regulation of the power supply unit for the power plant.
Preferably, the power supply unit for a power plant includes: the split winding step-down transformer is used for a generator, a generator main transformer and a high-voltage plant;
the generator is connected with a power grid system through the generator main transformer;
and the high-voltage side of the voltage reduction transformer of the split winding for the high-voltage plant is connected to the outlet of the generator.
Further, the power supply unit for power plant further includes: the system comprises a first factory system grid-connected circuit breaker and a second factory system grid-connected circuit breaker;
one end of the first plant system grid-connected circuit breaker is connected with a low-voltage side A winding of the high-voltage plant split winding voltage reduction transformer, and the other end of the first plant system grid-connected circuit breaker is connected with the controllable high-voltage plant flywheel energy storage unit;
one end of the second plant system grid-connected circuit breaker is connected with the low-voltage side B winding of the high-voltage plant split winding voltage-reduction transformer, and the other end of the second plant system grid-connected circuit breaker is connected with the controllable high-voltage plant flywheel energy storage unit.
Further, the controllable high-voltage station flywheel energy storage unit further comprises: the system comprises a first factory-used 6KV alternating current bus, a second factory-used 6KV alternating current bus, a first controllable high-voltage factory-used flywheel energy storage unit grid-connected circuit breaker and a second controllable high-voltage factory-used flywheel energy storage unit grid-connected circuit breaker;
the power supply electric energy conversion module includes: the first power supply electric energy conversion submodule and the second power supply electric energy conversion submodule;
the first power supply electric energy conversion sub-module is connected with the first station 6KV alternating current bus through the first controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker;
and the second power supply electric energy conversion submodule is connected with the second station 6KV alternating current bus through the second controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker.
Further, the first power supply power conversion sub-module includes: the first phase A power supply electric energy conversion unit, the first phase B power supply electric energy conversion unit and the first phase C power supply electric energy conversion unit;
the first A-phase power supply electric energy conversion unit, the first B-phase power supply electric energy conversion unit and the first C-phase power supply electric energy conversion unit are respectively connected with the first controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker;
the second power supply electric energy conversion submodule comprises: the second A-phase power supply electric energy conversion unit, the second B-phase power supply electric energy conversion unit and the second C-phase power supply electric energy conversion unit;
and the second A-phase power supply electric energy conversion unit, the second B-phase power supply electric energy conversion unit and the second C-phase power supply electric energy conversion unit are respectively connected with the second controllable high-voltage plant flywheel energy storage unit grid-connected circuit breaker.
Further, each of the power supply electric energy conversion units includes: the energy storage module of the flywheel and the IGBT current conversion device;
the flywheel energy storage module is connected with the IGBT current conversion device in parallel.
Further, the controllable high-voltage station flywheel energy storage unit further comprises: the system comprises a first high-voltage load grid-connected circuit breaker, a second high-voltage load grid-connected circuit breaker, a first high-voltage load and a second high-voltage load;
the first high-voltage load is connected with the first station-used 6KV alternating-current bus through the first high-voltage load grid-connected circuit breaker;
and the second high-voltage load is connected with the second plant-used 6KV alternating-current bus through the second high-voltage load grid-connected circuit breaker.
The embodiment of the second aspect of the application provides a frequency modulation method for a controllable high-voltage station flywheel energy storage auxiliary thermal power, which comprises the following steps:
acquiring a frequency modulation instruction, and determining active power to be adjusted based on the frequency modulation instruction;
determining active power required to be adjusted of each flywheel energy storage module according to the active power required to be adjusted;
and adjusting the charging and discharging power of each flywheel energy storage module based on the active power required to be adjusted by each flywheel energy storage module, and further responding to the frequency modulation instruction.
Preferably, the determining the active power required to be adjusted of each flywheel energy storage module according to the active power required to be adjusted includes:
respectively determining the charge state deviation correction coefficients corresponding to the flywheel energy storage modules;
and determining the active power required to be adjusted by the flywheel energy storage module based on the charge state deviation correction coefficient.
Further, the calculation formula of the state of charge deviation correction coefficient corresponding to the flywheel energy storage module is as follows:
in the formula (I), the compound is shown in the specification,
the correction coefficient of the state of charge deviation corresponding to the ith flywheel energy storage module in the first A-phase power supply electric energy conversion unit,
the difference value between the charge state corresponding to the ith flywheel energy storage module in the first A-phase power supply electric energy conversion unit and the average value of the charge states of the energy storage of the flywheels,
the average value of the energy storage charge state of each flywheel,
is a preset correction characteristic value.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
the application provides a controllable high-voltage plant is with supplementary thermal power's of flywheel energy storage frequency modulation system and method, the system includes: the system comprises a power supply unit for the power plant and a controllable high-voltage plant flywheel energy storage unit, wherein the power supply unit for the power plant is connected with the controllable high-voltage plant flywheel energy storage unit; the power supply unit for the power plant is used for adjusting the charging and discharging power of the controllable high-voltage plant flywheel energy storage unit according to a frequency modulation instruction; the controllable high-voltage station flywheel energy storage unit comprises a power supply and electric energy conversion module, and the power supply and electric energy conversion module is used for responding to the charging and discharging power regulation of the power station power supply unit. According to the technical scheme, the controllable high-voltage station flywheel energy storage unit is connected into the power supply unit for the power station, the combined generator set can participate in a response power grid frequency modulation adjusting process, the frequency modulation instruction can be responded quickly, and the safety of the system is improved.
Additional aspects and advantages of the present 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 present application.
Drawings
The above 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 of which:
fig. 1 is a block diagram of a frequency modulation system for a controllable high-voltage station flywheel energy storage auxiliary thermal power provided according to an embodiment of the present application;
FIG. 2 is a block diagram of a power supply unit for a power plant provided in accordance with one embodiment of the present application;
fig. 3 is a block diagram of a controllable high-voltage flywheel energy storage unit for a plant according to an embodiment of the present application;
fig. 4 is an overall schematic diagram of a frequency modulation system for a controllable high-voltage station flywheel energy storage auxiliary thermal power provided according to an embodiment of the present application;
fig. 5 is a flowchart of a frequency modulation method for a controllable high-voltage plant flywheel energy storage auxiliary thermal power provided according to an embodiment of the present application;
description of reference numerals:
the power supply system comprises a power supply unit 1 for a power plant, a flywheel energy storage unit 2 for a controllable high-voltage plant, a power supply electric energy conversion module 2-1, a generator 1-1, a main transformer 1-2 of the generator, a split winding step-down transformer 1-3 for the high-voltage plant, a first plant system grid-connected circuit breaker 1-4, a second plant system grid-connected circuit breaker 1-5, a first plant 6KV alternating current bus 2-2, a second plant 6KV alternating current bus 2-3, a first controllable high-voltage plant flywheel energy storage unit grid-connected circuit breaker 2-4, a second controllable high-voltage plant flywheel energy storage unit grid-connected circuit breaker 2-5, a first power supply electric energy conversion submodule 2-1-1, a second power supply electric energy conversion submodule 2-1-2, a first power supply electric energy conversion submodule 2-1-2, a second power supply electric energy conversion submodule a first A-phase power supply electric energy conversion unit 2-1-1-1, a first B-phase power supply electric energy conversion unit 2-1-1-2, a first C-phase power supply electric energy conversion unit 2-1-1-3, a second A-phase power supply electric energy conversion unit 2-1-2-1, a second B-phase power supply electric energy conversion unit 2-1-2-2, a second C-phase power supply electric energy conversion unit 2-1-2-3, a flywheel energy storage module 2-6, an IGBT (insulated gate bipolar translator) converter device 2-7, a first high-voltage load grid-connected circuit breaker 2-8, a second high-voltage load grid-connected circuit breaker 2-9, a first high-voltage load 2-10, a second high-voltage load 2-11, a first A-phase bus 2-12, a first B-phase bus 2-13, a first C-phase bus 2-14, a second A-phase bus 2-15, A second B-phase bus bar 2-16 and a second C-phase bus bar 2-17.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present application and should not be construed as limiting the present application.
The application provides a controllable high pressure mill is with supplementary thermal-power frequency modulation system of flywheel energy storage and method, the system includes: the system comprises a power supply unit for the power plant and a controllable high-voltage plant flywheel energy storage unit, wherein the power supply unit for the power plant is connected with the controllable high-voltage plant flywheel energy storage unit; the power supply unit for the power plant is used for adjusting the charging and discharging power of the controllable high-voltage plant flywheel energy storage unit according to a frequency modulation instruction; the controllable high-voltage station flywheel energy storage unit comprises a power supply and electric energy conversion module, and the power supply and electric energy conversion module is used for responding to the charging and discharging power regulation of the power station power supply unit. According to the technical scheme, the controllable high-voltage station flywheel energy storage unit is connected into the power supply unit for the power station, the combined generator set can participate in a response power grid frequency modulation adjusting process, the frequency modulation instruction can be responded quickly, and the safety of the system is improved.
The following describes a frequency modulation system and a frequency modulation method for a controllable high-voltage station flywheel energy storage auxiliary thermal power according to an embodiment of the present application with reference to the accompanying drawings.
Example one
Fig. 1 is a block diagram of a frequency modulation system for a controllable high-voltage station flywheel energy storage auxiliary thermal power provided according to an embodiment of the present application, as shown in fig. 1, the system includes: the system comprises a power supply unit 1 for the power plant and a controllable high-voltage plant flywheel energy storage unit 2, wherein the power supply unit 1 for the power plant is connected with the controllable high-voltage plant flywheel energy storage unit 2;
the power supply unit 1 for the power plant is used for adjusting the charging and discharging power of the controllable high-voltage plant flywheel energy storage unit 2 according to a frequency modulation instruction;
the controllable high-voltage station flywheel energy storage unit 2 comprises a power supply and electric energy conversion module 2-1, and the power supply and electric energy conversion module 2-1 is used for responding to the charging and discharging power regulation of the power supply unit 1 for the power generation station.
In the embodiment of the present disclosure, as shown in fig. 2, the power supply unit 1 for a power plant includes: the generator comprises a generator 1-1, a generator main transformer 1-2 and a split winding step-down transformer 1-3 for a high-voltage plant;
the generator 1-1 is connected with a power grid system through the generator main transformer 1-2;
the high-voltage side of the split winding voltage reduction transformer 1-3 for the high-voltage plant is connected to the outlet of the generator 1-1.
Further, as shown in fig. 2, the power supply unit 1 for power plant further includes: a first factory system grid-connected circuit breaker 1-4 and a second factory system grid-connected circuit breaker 1-5;
one end of the first plant system grid-connected circuit breaker 1-4 is connected with a low-voltage side A winding of the high-voltage plant split winding step-down transformer 1-3, and the other end of the first plant system grid-connected circuit breaker is connected with the controllable high-voltage plant flywheel energy storage unit 2;
one end of the second plant system grid-connected circuit breaker 1-5 is connected with the low-voltage side B winding of the high-voltage plant split winding step-down transformer 1-3, and the other end of the second plant system grid-connected circuit breaker is connected with the controllable high-voltage plant flywheel energy storage unit 2.
In the embodiment of the present disclosure, as shown in fig. 3, the controllable high-voltage flywheel energy storage unit 2 for a plant further includes: the system comprises a first factory-used 6KV alternating current bus 2-2, a second factory-used 6KV alternating current bus 2-3, a first controllable high-voltage factory-used flywheel energy storage unit grid-connected circuit breaker 2-4 and a second controllable high-voltage factory-used flywheel energy storage unit grid-connected circuit breaker 2-5;
the power supply electric energy conversion module 2-1 includes: the first power supply electric energy conversion submodule 2-1-1 and the second power supply electric energy conversion submodule 2-1-2;
the first power supply electric energy conversion submodule 2-1-1 is connected with the first station-used 6KV alternating current bus 2-2 through the first controllable high-voltage station-used flywheel energy storage unit grid-connected circuit breaker 2-4;
and the second power supply electric energy conversion submodule 2-1-2 is connected with the second station-used 6KV alternating current bus 2-3 through the second controllable high-voltage station-used flywheel energy storage unit grid-connected circuit breaker 2-5.
Further, as shown in fig. 3, the first power supply power conversion sub-module 2-1-1 includes: a first A-phase power supply electric energy conversion unit 2-1-1-1, a first B-phase power supply electric energy conversion unit 2-1-1-2 and a first C-phase power supply electric energy conversion unit 2-1-1-3;
the first A-phase power supply electric energy conversion unit 2-1-1-1, the first B-phase power supply electric energy conversion unit 2-1-1-2 and the first C-phase power supply electric energy conversion unit 2-1-1-3 are respectively connected with the first controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker 2-4;
the second power supply electric energy conversion submodule 2-1-2 includes: a second A-phase power supply electric energy conversion unit 2-1-2-1, a second B-phase power supply electric energy conversion unit 2-1-2-2 and a second C-phase power supply electric energy conversion unit 2-1-2-3;
the second A-phase power supply electric energy conversion unit 2-1-2-1, the second B-phase power supply electric energy conversion unit 2-1-2-2 and the second C-phase power supply electric energy conversion unit 2-1-2-3 are respectively connected with the second controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker 2-5.
As shown in fig. 3, each of the power supply/power conversion units includes: the flywheel energy storage module 2-6 and the IGBT current conversion device 2-7;
the flywheel energy storage module 2-6 is connected with the IGBT converter device 2-7 in parallel.
Further, as shown in fig. 3, the controllable high-voltage flywheel energy storage unit 2 for plant use further includes: the system comprises a first high-voltage load grid-connected circuit breaker 2-8, a second high-voltage load grid-connected circuit breaker 2-9, a first high-voltage load 2-10 and a second high-voltage load 2-11;
the first high-voltage load 2-10 is connected with the first station 6KV alternating current bus 2-2 through the first high-voltage load grid-connected circuit breaker 2-8;
and the second high-voltage load 2-11 is connected with the second station 6KV alternating current bus 2-3 through the second high-voltage load grid-connected circuit breaker 2-9.
Further, as shown in fig. 3, it should be noted that the controllable high-voltage plant flywheel energy storage unit 2 further includes: the bus comprises a first A-phase bus 2-12, a first B-phase bus 2-13, a first C-phase bus 2-14, a second A-phase bus 2-15, a second B-phase bus 2-16 and a second C-phase bus 2-17;
the first A-phase power supply electric energy conversion unit 2-1-1-1 is connected with the first controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker 2-4 through the first A-phase bus 2-12;
the first B-phase power supply electric energy conversion unit 2-1-1-2 is connected with the first controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker 2-4 through the first B-phase bus 2-13;
the first C-phase power supply electric energy conversion unit 2-1-1-3 is connected with the first controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker 2-4 through the first C-phase bus 2-14;
the second A-phase power supply electric energy conversion unit 2-1-2-1 is connected with the second controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker 2-5 through the second A-phase bus 2-15;
the second B-phase power supply electric energy conversion unit 2-1-2-2 is connected with a second controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker 2-5 through a second B-phase bus 2-16;
and the second C-phase power supply electric energy conversion unit 2-1-2-3 is connected with a second controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker 2-5 through a second C-phase bus 2-17.
Based on the introduction, as shown in fig. 4, an overall schematic diagram of a frequency modulation system of a controllable high-voltage plant flywheel energy storage auxiliary thermal power is shown, the frequency modulation system is based on the characteristics of rapid charging and accurate power control of flywheel energy storage, adopts a controllable high-voltage plant flywheel energy storage unit 2, responds to power adjustment of a power grid to a thermal power unit, assists the thermal power unit, and participates in power grid frequency mediation together, wherein the controllable high-voltage plant flywheel energy storage unit 2 is connected to a plant power section of the thermal power unit, so that the equipment change amount can be reduced, and further, the workload is small.
It should be noted that the flywheel energy storage module 2-6 realizes electric energy conversion through the IGBT current conversion device 2-7, the IGBT current conversion device 2-7 adopts a full-control power device, the maximum current is 1.5 times of the rated current, the requirement on the dynamic thermal stability of the circuit breaker is not high, the protection is simple, and the fault range is not expanded.
The single flywheel energy storage module 2-6 is connected with the single IGBT current conversion device 2-7 in parallel, a one-phase power supply electric energy conversion unit is composed of n flywheel energy storage modules 2-6 and the IGBT current conversion devices 2-7, each phase adopts a hot standby redundancy design, the reliability is obviously improved, and 3 one-phase power supply electric energy conversion units form a first power supply electric energy conversion submodule 2-1-1 or a second power supply electric energy conversion submodule 2-1-2 containing three phases of A, B and C and are connected to a 6KV alternating current bus, so that the flexible control of the controllable high-voltage plant flywheel energy storage unit 2, namely the flexible control of energy storage participating in frequency modulation, is realized.
Because each power supply electric energy conversion submodule adopts a single power supply electric energy conversion unit series scheme, voltage can be superposed to 6kV, energy storage boosting change is not needed, the power supply electric energy conversion submodules are directly connected to a 6KV alternating current bus, the power supply electric energy conversion units run independently, the coupling degree is low, the field and investment are saved, the reliability of equipment is enhanced, when a single power supply electric energy conversion unit is damaged, the IGBT current conversion devices 2-7 are directly conducted, the damaged single power supply electric energy conversion unit can be isolated on site, the work of other power supply electric energy conversion units is not influenced, the direct current circulation is further controlled like a centralized current conversion energy storage system, the short plate benefit of a wooden barrel is avoided, the direct current circulation is further controlled, and the single power supply electric energy conversion unit adopts the series scheme, the problem of uneven output of different electric cores in the parallel scheme is avoided, the temperature rise is controlled, the safety risk caused by overhigh temperature rise is avoided, and the main problem that the safety of a lithium battery is influenced, such as overcharging, overdischarging, and circulation, is solved.
It should be noted that each power supply energy conversion unit is designed as a controlled voltage source, the secondkPhase (a) ofiThe output voltage of each power supply electric energy conversion unit can be expressed as:u ki ，kthe vector sum of the output voltages of all the power supply electric energy conversion units in the phase, namely the voltage at the position of the output voltage merged into the 6KV alternating current bus can be expressed as
：
In the formula (I), wherein,kthe phase is any phase of distributed energy storage A, B and C for high-voltage plants,
for the switching function, when the normal operation of the power supply electric energy conversion device is 1 and when a fault occurs, 0, fault isolation can be realized,nand cascading the numbers for the single power supply electric energy conversion unit.
In order to realize the auxiliary thermal power frequency modulation of the flywheel energy storage unit 2 for the controllable high-voltage plant, each power supply unit is provided withThe electric energy conversion unit adopts an active power-frequency droop control scheme, which can be expressed as:
in the formula (I), wherein,
is as followskPhase in the firstiThe actual value of the angular frequency of each power supply electric energy conversion unit,
is as followskPhase in the firstiThe power supply and electric energy conversion unit outputs an active power actual value,
for the nominal value of the angular frequency,
for the purpose of the active power rating,
is a firstkPhase in the firstiThe active droop coefficient of each power supply electric energy conversion unit is always positive
When changed, can be based on
And adjusting the active power output in real time so as to realize frequency adjustment.
Each power supply electric energy conversion unit keeps the dynamic power balance of all the single power supply electric energy conversion units by adjusting the respective active power output, realizes the active power change of the controllable high-voltage station flywheel energy storage unit 2, and assists the thermal power generating unit as an integral response power grid to adjust the power of the thermal power generating unit to jointly participate in the power grid frequency adjustment.
Because each phase voltage is 6kV, a plurality of single power supply electric energy conversion units are required to be connected in series, and each power supply is provided withThe internal battery charge states of the electric energy conversion units are different, some electric energy residuals are more, some residuals are small, if unified active droop coefficients are adopted, when the internal battery charge states have deviation, the low-electric-quantity battery packs in the modules are caused to discharge in advance, the over-discharge phenomenon occurs, and the service life of a single power supply electric energy conversion unit is influenced. We introduce a state of charge deviation correction factor
Optimizing the output of power and the correction coefficient of the state of charge deviation of each power supply electric energy conversion device in the distribution frequency regulation
Can be expressed as:
in the formula (I), wherein,
is the average value of the energy storage charge state of the flywheel,
average value of internal battery charge state and flywheel energy storage charge state of each power supply electric energy conversion unit
The difference value of (a) to (b),
to correct the eigenvalues, it is always positive.
Energy storage state of charge versus frequency variationSOCThe change is slow and the speed of the change is slow,
the charge state deviation correction coefficient can be obtained through distributed communication and is corrected by adopting a low-bandwidth communication mode
By introducing active power-frequency droop, an active droop control equation with charge state balancing capability can be obtained as follows:
and performing charge and discharge control based on the active droop control equation.
In summary, in the frequency modulation system for the controllable high-voltage station flywheel energy storage auxiliary thermal power provided by this embodiment, the controllable high-voltage station flywheel energy storage unit is connected to the power supply unit for the power plant, and can participate in a response power grid frequency modulation adjustment process in combination with the generator set, so that the frequency modulation instruction can be responded quickly, and the safety of the system is improved.
Example two
As shown in fig. 5, the frequency modulation method for a controllable flywheel energy storage auxiliary thermal power for a high-voltage plant according to this embodiment includes:
step 1: acquiring a frequency modulation instruction, and determining active power to be adjusted based on the frequency modulation instruction;
step 2: determining the active power required to be adjusted of each flywheel energy storage module according to the active power required to be adjusted;
and step 3: and adjusting the charging and discharging power of each flywheel energy storage module based on the active power required to be adjusted by each flywheel energy storage module, and further responding to the frequency modulation instruction.
In an embodiment of the present disclosure, the determining, according to the active power required to be adjusted, the active power required to be adjusted by each flywheel energy storage module includes:
respectively determining the charge state deviation correction coefficients corresponding to the flywheel energy storage modules;
and determining the active power required to be adjusted by the flywheel energy storage module based on the charge state deviation correction coefficient.
Further, the calculation formula of the state of charge deviation correction coefficient corresponding to the flywheel energy storage module is as follows:
in the formula (I), the compound is shown in the specification,
the correction coefficient of the state of charge deviation corresponding to the ith flywheel energy storage module in the first A-phase power supply electric energy conversion unit,
the difference value between the charge state corresponding to the ith flywheel energy storage module in the first A-phase power supply electric energy conversion unit and the average value of the charge states of the stored energy of the flywheels,
the average value of the energy storage charge state of each flywheel,
is a preset correction characteristic value.
In summary, according to the frequency modulation method for the controllable high-voltage station flywheel energy storage auxiliary thermal power provided by the embodiment, the controllable high-voltage station flywheel energy storage unit is connected to the power supply unit for the power plant, so that the frequency modulation instruction can be quickly responded in a process of responding to the power grid frequency modulation regulation by combining with the generator set, and the safety of the system is improved.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means 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 application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
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 steps of a custom logic function or process, and alternate 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 present application.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (1)
1. The utility model provides a controllable high pressure mill is with supplementary thermal power's of flywheel energy storage frequency modulation system which characterized in that includes: the system comprises a power supply unit for the power plant and a controllable high-voltage plant flywheel energy storage unit, wherein the power supply unit for the power plant is connected with the controllable high-voltage plant flywheel energy storage unit;
the power supply unit for the power plant is used for adjusting the charging and discharging power of the controllable high-voltage plant flywheel energy storage unit according to a frequency modulation instruction;
the controllable high-voltage plant flywheel energy storage unit comprises a power supply electric energy conversion module, and the power supply electric energy conversion module is used for responding to charge and discharge power adjustment of the power supply unit for the power plant;
the power supply unit for a power plant includes: the split winding step-down transformer is used for a generator, a generator main transformer and a high-voltage plant;
the generator is connected with a power grid system through the generator main transformer;
the high-voltage side of the high-voltage plant split winding voltage reduction transformer is connected to the outlet of the generator;
the power supply unit for a power plant further comprises: the system comprises a first factory system grid-connected circuit breaker and a second factory system grid-connected circuit breaker;
one end of the first plant system grid-connected circuit breaker is connected with a low-voltage side A winding of the high-voltage plant split winding voltage reduction transformer, and the other end of the first plant system grid-connected circuit breaker is connected with the controllable high-voltage plant flywheel energy storage unit;
one end of the second plant system grid-connected circuit breaker is connected with the low-voltage side B winding of the high-voltage plant split winding voltage-reduction transformer, and the other end of the second plant system grid-connected circuit breaker is connected with the controllable high-voltage plant flywheel energy storage unit;
the controllable high-voltage station flywheel energy storage unit further comprises: the system comprises a first factory-used 6KV alternating current bus, a second factory-used 6KV alternating current bus, a first controllable high-voltage factory-used flywheel energy storage unit grid-connected circuit breaker and a second controllable high-voltage factory-used flywheel energy storage unit grid-connected circuit breaker;
the power supply electric energy conversion module includes: the first power supply electric energy conversion submodule and the second power supply electric energy conversion submodule;
the first power supply electric energy conversion submodule is connected with the first station-used 6KV alternating current bus through the first controllable high-voltage station-used flywheel energy storage unit grid-connected circuit breaker;
the second power supply electric energy conversion sub-module is connected with the second station-used 6KV alternating current bus through the second controllable high-voltage station-used flywheel energy storage unit grid-connected circuit breaker;
the first power supply electric energy conversion sub-module comprises: the first phase A power supply electric energy conversion unit, the first phase B power supply electric energy conversion unit and the first phase C power supply electric energy conversion unit;
the first A-phase power supply electric energy conversion unit, the first B-phase power supply electric energy conversion unit and the first C-phase power supply electric energy conversion unit are respectively connected with the first controllable high-voltage plant flywheel energy storage unit grid-connected circuit breaker;
the second power supply electric energy conversion submodule comprises: the second A-phase power supply electric energy conversion unit, the second B-phase power supply electric energy conversion unit and the second C-phase power supply electric energy conversion unit;
the second A-phase power supply electric energy conversion unit, the second B-phase power supply electric energy conversion unit and the second C-phase power supply electric energy conversion unit are respectively connected with the second controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker;
each of the power supply electric energy conversion units includes: the energy storage module of the flywheel and the IGBT current conversion device;
the flywheel energy storage module is connected with the IGBT converter device in parallel;
the controllable high-voltage station flywheel energy storage unit further comprises: the system comprises a first high-voltage load grid-connected circuit breaker, a second high-voltage load grid-connected circuit breaker, a first high-voltage load and a second high-voltage load;
the first high-voltage load is connected with the first station 6KV alternating-current bus through the first high-voltage load grid-connected circuit breaker;
the second high-voltage load is connected with the second station 6KV alternating-current bus through the second high-voltage load grid-connected circuit breaker;
the controllable high-voltage station flywheel energy storage unit further comprises: the first phase-A bus, the first phase-B bus, the first phase-C bus, the second phase-A bus, the second phase-B bus and the second phase-C bus;
the first A-phase power supply electric energy conversion unit is connected with the first controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker through the first A-phase bus;
the first B-phase power supply electric energy conversion unit is connected with the first controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker through the first B-phase bus;
the first C-phase power supply electric energy conversion unit is connected with the first controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker through the first C-phase bus;
the second A-phase power supply electric energy conversion unit is connected with the second controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker through the second A-phase bus;
the second B-phase power supply electric energy conversion unit is connected with a second controllable high-voltage station flywheel energy storage unit grid-connected circuit breaker through the second B-phase bus;
the second C-phase power supply electric energy conversion unit is connected with a grid-connected circuit breaker of a second controllable high-voltage station flywheel energy storage unit through a second C-phase bus;
the frequency modulation method of the frequency modulation system of the flywheel energy storage auxiliary thermal power for the controllable high-voltage plant comprises the following steps:
acquiring a frequency modulation instruction, and determining active power to be adjusted based on the frequency modulation instruction;
determining active power required to be adjusted of each flywheel energy storage module according to the active power required to be adjusted;
adjusting the charging and discharging power of each flywheel energy storage module based on the active power required to be adjusted by each flywheel energy storage module, and further responding to the frequency modulation instruction;
the active power required to be adjusted of each flywheel energy storage module is determined according to the active power required to be adjusted, and the method comprises the following steps:
respectively determining the charge state deviation correction coefficients corresponding to the flywheel energy storage modules;
and determining active power required to be adjusted by the flywheel energy storage module based on the charge state deviation correction coefficient, wherein the calculation formula of the charge state deviation correction coefficient corresponding to the flywheel energy storage module is as follows:
in the formula (I), the compound is shown in the specification,
the correction coefficient of the state of charge deviation corresponding to the ith flywheel energy storage module in the first A-phase power supply electric energy conversion unit,
the difference value between the charge state corresponding to the ith flywheel energy storage module in the first A-phase power supply electric energy conversion unit and the average value of the charge states of the stored energy of the flywheels,
the average value of the energy storage charge state of each flywheel,
is a preset correction characteristic value.
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