CN113890074B - Charging and discharging circuit and method for energy storage battery of wind turbine generator - Google Patents
Charging and discharging circuit and method for energy storage battery of wind turbine generator Download PDFInfo
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- CN113890074B CN113890074B CN202111029745.7A CN202111029745A CN113890074B CN 113890074 B CN113890074 B CN 113890074B CN 202111029745 A CN202111029745 A CN 202111029745A CN 113890074 B CN113890074 B CN 113890074B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 253
- 238000007599 discharging Methods 0.000 title claims abstract description 168
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000003990 capacitor Substances 0.000 claims description 121
- 230000002441 reversible effect Effects 0.000 claims description 118
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000013256 coordination polymer Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 101100028920 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) cfp gene Proteins 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 231100000167 toxic agent Toxicity 0.000 description 2
- 239000003440 toxic substance Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010291 electrical method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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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
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- 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
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charging and discharging circuit and a charging and discharging method for an energy storage battery of a wind turbine generator. The method solves the problems of intermittent wind power energy, low predictable certainty, great impact on a planned and schedulable power grid, high simultaneous coefficients of a wind turbine generator set and a wind power plant and the like in the prior art.
Description
Technical Field
The invention relates to the technical field of wind power generation and energy storage, in particular to a charging and discharging circuit and a charging and discharging method for an energy storage battery of a wind turbine generator.
Background
The new energy wind power generator set occupies a larger proportion in the Chinese power system, and the doubly-fed wind power generator set in the global wind power generator set assembly machine currently occupies a main about 50% share. The new energy installation and the running capacity are continuously increased in China, and meanwhile, the high-proportion wind energy of the power grid enters the power grid load center, so that the wind energy is intermittently and incompletely predictably determined, and the impact on the power grid which can be planned and scheduled is very large. In addition, the simultaneous coefficient of the wind turbine generator is higher, the equivalent capacity coefficient of the wind turbine generator is lower, and the general equivalent capacity is 1/3 of the fan assembly capacity, so that the simultaneous coefficient of the wind turbine generator is reduced, the intermittent and incompletely predictable determination type of high-proportion wind energy networking is reduced, and the problems can be solved. The energy storage product of the wind turbine generator is developed as soon as possible, so that the power grid is more suitable for the entry of high-proportion wind power energy, and the due contribution is made for achieving the carbon-peak-carbon neutralization target as soon as possible in China.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a charging and discharging circuit and method for an energy storage battery of a wind turbine generator, and solves the problems of intermittent wind power energy, low predictable certainty, large impact on a planned and schedulable power grid, high simultaneous coefficient of the wind turbine generator and a wind power plant and the like in the prior art.
The invention solves the problems by adopting the following technical scheme:
the utility model provides a wind turbine generator system energy storage battery charge-discharge circuit, includes converter direct current link, second charge-discharge unit first group, second charge-discharge unit second group, first way bypass charge-discharge unit, second way bypass charge-discharge unit, energy storage battery, converter direct current link with energy storage battery is respectively through second charge-discharge unit first group, second charge-discharge unit second group, first way bypass charge-discharge unit, second way bypass charge-discharge unit electric connection forms four parallel branch.
When in operation, the following charge and discharge modes can be adopted:
when the wind turbine generator system normally operates, the converter direct current link charges the energy storage battery through the first group of the secondary charging and discharging units or the second group of the secondary charging and discharging units, and the energy storage battery discharges the converter direct current link through the first group of the secondary charging and discharging units or the second group of the secondary charging and discharging units; therefore, the direct current link of the converter charges and discharges the energy storage battery indirectly in a ferry mode, so that the safety reliability of the wind turbine generator converter is ensured, the efficiency of the energy storage battery is improved, and the simultaneous coefficient of a wind power plant is reduced;
When the wind turbine generator is abnormally operated or stopped, the direct current link of the converter charges the energy storage battery through the first bypass charging and discharging unit or the second bypass charging and discharging unit, and the energy storage battery discharges the direct current link of the converter through the first bypass charging and discharging unit or the second bypass charging and discharging unit; the method reduces the electric impact on the direct current links of the energy storage battery and the converter, thereby prolonging the service life of the wind turbine and ensuring the reliability of the wind turbine.
As a preferable technical scheme, the first group of the secondary charging and discharging units comprises a charging switch T c111 Discharge switch T f111 Charging switch T c112 Discharge switch T f112 Super capacitor C1, the charging switch T c111 And the discharge switch T f111 The reverse interlock forms a first reverse interlock switch, the charging switch T c112 And the discharge switch T f112 The reverse interlocking forms a second reverse interlocking switch, and the direct current link of the converter is electrically connected with the two poles of the energy storage battery through the first reverse interlocking switch and the second reverse interlocking switch respectivelyOne pole of the super capacitor C1 is electrically connected to a node between a first reverse interlocking switch and one pole of the energy storage battery, and the other pole of the super capacitor C1 is electrically connected to a node between a second reverse interlocking switch and the other pole of the energy storage battery;
The second group of the secondary charging and discharging units comprises a charging switch T c211 Discharge switch T f211 Charging switch T c212 Discharge switch T f212 Super capacitor C2, the charging switch T c211 And the discharge switch T f211 The reverse interlocking forms a third reverse interlocking switch, and the charging switch T c212 And the discharge switch T f212 The reverse interlocking forms a fourth reverse interlocking switch, the direct current link of the current transformer is electrically connected with two poles of the energy storage battery through the third reverse interlocking switch and the fourth reverse interlocking switch respectively, one pole of the super capacitor C2 is electrically connected with a node between the third reverse interlocking switch and one pole of the energy storage battery, and the other pole of the super capacitor C2 is electrically connected with a node between the fourth reverse interlocking switch and the other pole of the energy storage battery.
As a preferable technical scheme, the first group of the secondary charging and discharging units further comprises a fuse RD 111 RD fuse 112 The fuse RD 111 In series with the first reverse interlocking switch to form a first serial body, the fuse RD 112 The second series connection body is formed by connecting the second reverse interlocking switch in series; the second group of the secondary charge-discharge units further comprises a fuse RD 211 RD fuse 212 The fuse RD 211 A third serial body is formed by being connected with the third reverse interlocking switch in series, the fuse RD 212 And the fourth series body is formed by connecting the fourth reverse interlocking switch in series.
As a preferable technical scheme, the first group of the secondary charging and discharging units further comprises a charging switch T c121 Discharge switch T f121 Charging switch T c122 Discharge switch T f122 The charging switch T c121 And the discharge switch T f121 Reverse interlock constitutes a fifth reverse interlockSwitch, the charging switch T c122 And the discharge switch T f122 The reverse interlocking structure comprises a sixth reverse interlocking switch, one end of the fifth reverse interlocking switch is electrically connected to a node between the first serial body and the super capacitor C1, the other end of the fifth reverse interlocking switch is electrically connected to one pole of the energy storage battery, one end of the sixth reverse interlocking switch is electrically connected to a node between the second serial body and the super capacitor C1, and the other end of the sixth reverse interlocking switch is electrically connected to the other pole of the energy storage battery;
the second group of the secondary charging and discharging units also comprises a charging switch T c211 Discharge switch T f211 Charging switch T c212 Discharge switch T f212 The charging switch T c211 And the discharge switch T f211 The reverse interlock forms a seventh reverse interlock switch, the charging switch T c122 And the discharge switch T f122 The reverse interlock constitutes eighth reverse interlock switch, the one end of seventh reverse interlock switch is electric to be connected in the third serial body with the node between the super capacitor C2, the other end of seventh reverse interlock switch is electric to be connected in one pole of energy storage battery, the one end of eighth reverse interlock switch is electric to be connected in the fourth serial body with the node between the super capacitor C2, the other end of eighth reverse interlock switch is electric to be connected in the other pole of energy storage battery.
As a preferable technical scheme, the first group of the secondary charging and discharging units further comprises a fuse RD 121 RD fuse 122 The fuse RD 121 A fifth serial body is formed by being connected with the fifth reverse interlocking switch in series, and the fuse RD 122 A sixth serial body is formed by the sixth reverse interlocking switch, one end of the fifth serial body is electrically connected with a node between the first serial body and the super capacitor C1, the other end of the fifth serial body is electrically connected with one pole of the energy storage battery, one end of the sixth serial body is electrically connected with a node between the second serial body and the super capacitor C1, and the other end of the sixth serial body is electrically connected with the energy storage battery The other pole of the energy cell;
the second group of the secondary charge-discharge units further comprises a fuse RD 221 RD fuse 222 The fuse RD 221 A seventh serial body is formed by being connected with the seventh reverse interlocking switch in series, the fuse RD 222 And one end of the seventh serial body is electrically connected with a node between the third serial body and the super capacitor C2, the other end of the seventh serial body is electrically connected with one pole of the energy storage battery, one end of the eighth serial body is electrically connected with a node between the fourth serial body and the super capacitor C2, and the other end of the eighth serial body is electrically connected with the other pole of the energy storage battery.
As a preferable technical scheme, the first bypass charging and discharging unit comprises contactors JC connected in series pcf1 RD fuse pcf1 The second bypass charge-discharge unit comprises contactors JC connected in series pcf2 RD fuse pcf1 。
As a preferable technical scheme, the energy storage battery is connected with the UPS and EPS direct current ring in a power saving way.
As a preferable technical proposal, the utility model also comprises contactors JC connected in series with each other 13 And fuse RD 13 Contactor JC connected in series with each other 23 And fuse RD 23 The UPS (uninterrupted Power supply)&One pole of EPS direct current link passes through contactor JC 13 RD fuse 13 Electrically connected to one pole of the energy storage battery, the UPS&The other pole of the EPS direct current link passes through a contactor JC 23 RD fuse 23 Is electrically connected to the other pole of the energy storage battery.
As a preferable technical scheme, the energy storage battery comprises a first energy storage battery and a second energy storage battery which are mutually connected in series, and further comprises a contactor JC which is mutually connected in series 33 And fuse RD 33 Contactor JC connected in series with each other 43 And fuse RD 43 The first energy storageThe node between the battery and the second energy storage battery passes through a contactor JC 43 RD fuse 43 With the UPS&One pole of the EPS direct current link is electrically connected, and a node between the first energy storage battery and the second energy storage battery is connected with the first energy storage battery through a contactor JC 33 RD fuse 33 With the UPS&The other pole of the EPS DC link is electrically connected.
The charging and discharging method for the energy storage battery of the wind turbine generator adopts the charging and discharging circuit for the energy storage battery of the wind turbine generator, and comprises the following charging and discharging modes:
c. when the wind turbine generator system normally operates, the converter direct current link charges the energy storage battery through the first group of the secondary charging and discharging units or the second group of the secondary charging and discharging units, and the energy storage battery discharges the converter direct current link through the first group of the secondary charging and discharging units or the second group of the secondary charging and discharging units;
d. When the wind turbine generator is abnormally operated or stopped, the direct current link of the converter charges the energy storage battery through the first bypass charging and discharging unit or the second bypass charging and discharging unit, and the energy storage battery discharges the direct current link of the converter through the first bypass charging and discharging unit or the second bypass charging and discharging unit.
When the wind turbine generator system normally operates, the converter direct current link charges the energy storage battery through the first group of the secondary charging and discharging units or the second group of the secondary charging and discharging units, and the energy storage battery discharges the converter direct current link through the first group of the secondary charging and discharging units or the second group of the secondary charging and discharging units; therefore, the direct current link of the converter charges and discharges the energy storage battery indirectly in a ferry mode, so that the safety reliability of the wind turbine generator converter is ensured, the efficiency of the energy storage battery is improved, and the simultaneous coefficient of a wind power plant is reduced;
when the wind turbine generator is abnormally operated or stopped, the direct current link of the converter charges the energy storage battery through the first bypass charging and discharging unit or the second bypass charging and discharging unit, and the energy storage battery discharges the direct current link of the converter through the first bypass charging and discharging unit or the second bypass charging and discharging unit; the method reduces the electric impact on the direct current links of the energy storage battery and the converter, thereby prolonging the service life of the wind turbine and ensuring the reliability of the wind turbine.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention ensures the safety and reliability of the converter of the wind turbine generator, improves the efficiency of the energy storage battery and reduces the simultaneous coefficient of the wind power plant; the electric impact on DC links of the energy storage battery and the converter is reduced, so that the service life of the wind turbine generator is prolonged, and the reliability of the wind turbine generator is ensured;
(2) Two groups of super capacitors are adopted for charging and discharging, redundancy and standby are increased, the charging and discharging rated current is improved, and redundancy and standby are increased;
(3) The reliability and the safety of the first group of the secondary charging and discharging units and the second group of the secondary charging and discharging units are guaranteed;
(4) The method is beneficial to implementing time-division and intermittent charge and discharge of the super capacitor C1 and the super capacitor C2, and can also ensure the reliability and safety of the super capacitor C1 and the super capacitor C2;
(5) The reliability and the safety of the super capacitor C1 and the super capacitor C2 are further improved;
(6) The wind turbine generator has bypass secondary ferry charging load, so that the fluctuation rate of the internet surfing power of the wind turbine generator is reduced; the system can participate in primary frequency modulation and load peak regulation of the power grid, and high-proportion electric power and electric energy of new energy are added to enter the power grid for consumption; the simultaneous coefficient of the wind power plant can be reduced, and the capacity and investment cost of the electric equipment of the network power transmission and transformation channel can be reduced;
(7) The UPS and EPS direct current link provides redundancy and backup functions, and further plays a role in stabilizing charge and discharge;
(8) The reliability and the safety of UPS (uninterrupted Power supply) and EPS direct current links are conveniently ensured;
(9) The parallel voltage reduction function is realized on the UPS and EPS direct current links, and the reliability and the safety of the energy storage battery and the UPS and EPS direct current links are further ensured.
Drawings
FIG. 1 is a block diagram of a charging and discharging circuit of an energy storage battery of a wind turbine generator set;
FIG. 2 is a schematic diagram of a charging and discharging circuit of an energy storage battery of a wind turbine generator according to the present invention;
FIG. 3 is a second schematic diagram of a charge-discharge circuit of an energy storage battery of a wind turbine generator according to the present invention;
FIG. 4 is one of the partial enlarged views of FIG. 2;
FIG. 5 is a second enlarged view of a portion of FIG. 2;
FIG. 6 is one of the partial enlarged views of FIG. 3;
fig. 7 is a second enlarged view of a portion of fig. 3.
The reference numerals and corresponding part names in the drawings: 1-a current transformer; 2-converter network side NPR 0 The method comprises the steps of carrying out a first treatment on the surface of the 3-converter side MPR 0 The method comprises the steps of carrying out a first treatment on the surface of the DC link E of 4-converter C0 The method comprises the steps of carrying out a first treatment on the surface of the A 5-generator; 6-a secondary charge-discharge device; 7-a first stage unit; 8-a second stage unit; 9-a third stage unit; a first group of 10-two-stage charge and discharge cells; 11-a second group of secondary charge-discharge cells; 12-super capacitor C 1 The method comprises the steps of carrying out a first treatment on the surface of the 13-super capacitor C 2 The method comprises the steps of carrying out a first treatment on the surface of the 14-a first high voltage energy storage block; 15-a second high voltage energy storage block; 16-energy storage battery E 12 The method comprises the steps of carrying out a first treatment on the surface of the 17-a first bypass charge-discharge unit; 18-a second bypass charge-discharge unit; 19-a first path of charge-discharge loop; 20-a second charge-discharge loop; 21-a third charge-discharge loop; 22-a fourth charge-discharge loop; 23-intermediate connection contactor JC 03 The method comprises the steps of carrying out a first treatment on the surface of the 24-auxiliary loop transformer; 25-UPS&EPS；26-UPS&EPS network side NPR 1 ；27-UPS&EPS-side MPR 1 ；28-UPS&EPS DC link E 3 The method comprises the steps of carrying out a first treatment on the surface of the 29-auxiliary circuit low voltage bus; 30-a main loop bus of the converter; 31-switch K 0 The method comprises the steps of carrying out a first treatment on the surface of the 32-contactor JC 0 The method comprises the steps of carrying out a first treatment on the surface of the 33-switch K 1 The method comprises the steps of carrying out a first treatment on the surface of the 34-switch K 2 The method comprises the steps of carrying out a first treatment on the surface of the 35-switch K 3 。
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
In order to reduce confusion between the reference numerals and the electronic component symbols and subscripts, the working process and working principle of the present invention are described in detail in embodiment 1 and embodiment 2, and reference numerals are appended to embodiment 3 for easier explanation and understanding. But this does not affect the essence of the invention.
Example 1
As shown in fig. 1 to 3, the charging and discharging circuit of the energy storage battery of the wind turbine generator comprises a converter direct current link, a first group of secondary charging and discharging units, a second group of secondary charging and discharging units, a first bypass charging and discharging unit, a second bypass charging and discharging unit and an energy storage battery, wherein the converter direct current link and the energy storage battery are electrically connected through the first group of secondary charging and discharging units, the second group of secondary charging and discharging units, the first bypass charging and discharging unit and the second bypass charging and discharging unit respectively to form four parallel branches.
When in operation, the following charge and discharge modes can be adopted:
when the wind turbine generator system normally operates, the converter direct current link charges the energy storage battery through the first group of the secondary charging and discharging units or the second group of the secondary charging and discharging units, and the energy storage battery discharges the converter direct current link through the first group of the secondary charging and discharging units or the second group of the secondary charging and discharging units; therefore, the direct current link of the converter charges and discharges the energy storage battery indirectly in a ferry mode, so that the safety reliability of the wind turbine generator converter is ensured, the efficiency of the energy storage battery is improved, and the simultaneous coefficient of a wind power plant is reduced;
when the wind turbine generator is abnormally operated or stopped, the direct current link of the converter charges the energy storage battery through the first bypass charging and discharging unit or the second bypass charging and discharging unit, and the energy storage battery discharges the direct current link of the converter through the first bypass charging and discharging unit or the second bypass charging and discharging unit; the method reduces the electric impact on the direct current links of the energy storage battery and the converter, thereby prolonging the service life of the wind turbine and ensuring the reliability of the wind turbine.
The working principle is as follows:
when the wind turbine generator system normally operates, the direct-current capacitors of the converter with higher direct-current voltage individually charge the super-capacitors with lower direct-current voltage; after charging, the super capacitor with high DC voltage is charged And charging the high-voltage energy storage battery with relatively low direct-current voltage. Because the wind turbine generator system is required to run within the range of +/-10% of the internet voltage for a long time, once the direct-current voltage of the direct-current capacitor of the converter is relatively low, the high-voltage energy storage battery with relatively high direct-current voltage can charge the super capacitor with relatively low direct-current voltage independently, and after the wind turbine generator system is charged, the super capacitor with relatively high direct-current voltage charges the direct-current capacitor of the converter with relatively low direct-current voltage independently. Energy of capacitorVariation of its capacity C DeltaU C U CP (△U C U is the variation before and after the variation of the capacitance voltage CP To be the average before and after its capacitance voltage changes).
The ferry type charge and discharge mode fully utilizes the high specific power (W/kg) of the super capacitor, the corresponding charge and discharge speed (millisecond level), the charge and discharge time (1-30 s), the discharge multiplying power is high, the ferry type charge and discharge energy storage device is suitable for the high-frequency pulse electric environment, the charge and discharge times or the cycle life is very high (50 ten thousand times), the operation temperature is low, the upper and lower limit temperature is wide (-40 ℃ -70 ℃), the working voltage resistance is high (1000 VDC), the charge efficiency is high (95%), the reliability is high, the maintenance cost is low, and the structure is simple and no toxic substance exists.
But the specific energy (Wh/kg) of the super capacitor is low, the energy storage period is short (in minutes), higher control voltage is needed, and the rated voltage of a single super capacitor is low; the price is relatively high.
Therefore, the super capacitor is not suitable for large-capacity energy storage with longer period, is very suitable for short-time energy storage with larger acting rate and small energy density, and has good electrical adaptability and environmental adaptability; the price is relatively high. The specific energy (Wh/kg) of the high-voltage energy storage battery is high, the corresponding charging and discharging speed is high (millisecond level), the discharging time is 0.3-3h, the discharging multiplying power is high, the energy storage period is long (days or weeks), the working withstand voltage is high (800-1000 VDC), the charging efficiency is high (85%), the price is relatively low, and the reliability is high; but the high-voltage energy storage battery has lower specific power (W/kg), the charging time (1-5 h), low charging and discharging times or cycle life (2000 times), narrow temperature range (-15-60 ℃) and poor charging and discharging performance at low temperature, and the problems can be solved by hot mixing and ventilation.
Therefore, the high-voltage energy storage battery is not suitable for high-power energy storage with short period, is very suitable for long-term energy storage with large capacity, has good electrical adaptability under the condition of heat mixing and ventilation, and has good environmental adaptability; the price is relatively low.
The super capacitor is used for increasing the voltage of the energy storage battery, and a ferry type charging and discharging mode is one of the best electric energy storage modes at present.
As a preferable technical scheme, the first group of the secondary charging and discharging units comprises a charging switch T c111 Discharge switch T f111 Charging switch T c112 Discharge switch T f112 Super capacitor C1, the charging switch T c111 And the discharge switch T f111 The reverse interlock forms a first reverse interlock switch, the charging switch T c112 And the discharge switch T f112 The reverse interlocking is formed into a second reverse interlocking switch, the direct current link of the current transformer is electrically connected with two poles of the energy storage battery through the first reverse interlocking switch and the second reverse interlocking switch respectively, one pole of the super capacitor C1 is electrically connected with a node between the first reverse interlocking switch and one pole of the energy storage battery, and the other pole of the super capacitor C1 is electrically connected with a node between the second reverse interlocking switch and the other pole of the energy storage battery;
the second group of the secondary charging and discharging units comprises a charging switch T c211 Discharge switch T f211 Charging switch T c212 Discharge switch T f212 Super capacitor C2, the charging switch T c211 And the discharge switch T f211 The reverse interlocking forms a third reverse interlocking switch, and the charging switch T c212 And the discharge switch T f212 The reverse interlocking forms a fourth reverse interlocking switch, the direct current link of the converter is electrically connected with two poles of the energy storage battery through a third reverse interlocking switch and the fourth reverse interlocking switch respectively, and one pole of the super capacitor C2 is electrically connected with the third reverse interlocking switch and the energy storage battery And the other pole of the super capacitor C2 is electrically connected with the node between the fourth reverse interlocking switch and the other pole of the energy storage battery.
The first group of the secondary charging and discharging units and the second group of the secondary charging and discharging units are subjected to charge and discharge alternate conversion without intermittence or with less gap time. The super-capacitor of the two groups of charging units is bypassed by the direct current link of the converter, the high-capacity energy storage battery is charged in turn by the time-division secondary ferry, the preset charging voltage target value is improved in a saving way, and the final voltage value of the full electric energy of the high-capacity energy storage battery is finally reached.
Because the single-group super capacitor is charged and discharged and the long-term energy storage battery is intermittently charged and discharged, the rated charge and discharge current is smaller, and redundancy and standby are insufficient; and two groups of super capacitors are adopted for charging and discharging, so that redundancy and standby are increased, the charging and discharging rated current is improved, and the redundancy and standby are increased.
As a preferable technical scheme, the first group of the secondary charging and discharging units further comprises a fuse RD 111 RD fuse 112 The fuse RD 111 In series with the first reverse interlocking switch to form a first serial body, the fuse RD 112 The second series connection body is formed by connecting the second reverse interlocking switch in series; the second group of the secondary charge-discharge units further comprises a fuse RD 211 RD fuse 212 The fuse RD 211 A third serial body is formed by being connected with the third reverse interlocking switch in series, the fuse RD 212 And the fourth series body is formed by connecting the fourth reverse interlocking switch in series.
Because the single super capacitors are charged and discharged, redundancy and standby are insufficient, and the two super capacitors are charged and discharged, the redundancy and standby are increased, and the reliability and safety of the system in operation are improved. This is advantageous in ensuring the reliability and safety of the first group of secondary charge-discharge cells and the second group of secondary charge-discharge cells.
As a preferable technical scheme, the first group of the secondary charging and discharging units further comprises a charging switch T c121 Discharge switch T f121 Charging switch T c122 Discharge switch T f122 The sum ofThe charging switch T c121 And the discharge switch T f121 The reverse interlock forms a fifth reverse interlock switch, the charging switch T c122 And the discharge switch T f122 The reverse interlocking structure comprises a sixth reverse interlocking switch, one end of the fifth reverse interlocking switch is electrically connected to a node between the first serial body and the super capacitor C1, the other end of the fifth reverse interlocking switch is electrically connected to one pole of the energy storage battery, one end of the sixth reverse interlocking switch is electrically connected to a node between the second serial body and the super capacitor C1, and the other end of the sixth reverse interlocking switch is electrically connected to the other pole of the energy storage battery;
The second group of the secondary charging and discharging units also comprises a charging switch T c211 Discharge switch T f211 Charging switch T c212 Discharge switch T f212 The charging switch T c211 And the discharge switch T f211 The reverse interlock forms a seventh reverse interlock switch, the charging switch T c122 And the discharge switch T f122 The reverse interlock constitutes eighth reverse interlock switch, the one end of seventh reverse interlock switch is electric to be connected in the third serial body with the node between the super capacitor C2, the other end of seventh reverse interlock switch is electric to be connected in one pole of energy storage battery, the one end of eighth reverse interlock switch is electric to be connected in the fourth serial body with the node between the super capacitor C2, the other end of eighth reverse interlock switch is electric to be connected in the other pole of energy storage battery.
Because each group of super capacitors adopted has high safety reliability and safety, has long-term operation performance support, large discharge current, high charge and discharge cycle times, unchanged characteristics, good electrical environment adaptability and good high-low temperature adaptability, and has good reliability and safety when used as super capacitors for short-time high-power (high-current) charge and discharge.
The super capacitor C1 and the super capacitor C2 are charged and discharged intermittently in a time-division manner, and the reliability and the safety of the super capacitor C1 and the super capacitor C2 can be guaranteed.
As a preferable technical scheme, the first group of the secondary charging and discharging units further comprises a fuse RD 121 RD fuse 122 The fuse RD 121 A fifth serial body is formed by being connected with the fifth reverse interlocking switch in series, and the fuse RD 122 A sixth serial body is formed by the sixth reverse interlocking switch, one end of the fifth serial body is electrically connected with a node between the first serial body and the super capacitor C1, the other end of the fifth serial body is electrically connected with one pole of the energy storage battery, one end of the sixth serial body is electrically connected with a node between the second serial body and the super capacitor C1, and the other end of the sixth serial body is electrically connected with the other pole of the energy storage battery;
the second group of the secondary charge-discharge units further comprises a fuse RD 221 RD fuse 222 The fuse RD 221 A seventh serial body is formed by being connected with the seventh reverse interlocking switch in series, the fuse RD 222 And one end of the seventh serial body is electrically connected with a node between the third serial body and the super capacitor C2, the other end of the seventh serial body is electrically connected with one pole of the energy storage battery, one end of the eighth serial body is electrically connected with a node between the fourth serial body and the super capacitor C2, and the other end of the eighth serial body is electrically connected with the other pole of the energy storage battery.
Because of adopting alternate charging and alternate discharging, under the same rated charging and discharging current, under the condition that the super capacitor with very high cycle times (charging and discharging times) is held, compared with the super capacitor of a single group, the reliability and the safety are higher after adopting two groups of super capacitors. This further improves the reliability and safety of the super capacitor C1, C2.
As a preferable technical scheme, the first bypass charging and discharging unit comprises contactors JC connected in series pcf1 RD fuse pcf1 The second bypass charge-discharge unit comprises contactors JC connected in series pcf2 RD fuse pcf1 。
The redundant electric energy of the wind motor set can be stored into a high-capacity energy storage battery by a secondary ferry charging method of a direct current link bypass of the converter; by the bypass of the high-capacity energy storage battery in the DC link of the converter and the ferry type secondary discharging method, redundant electric energy of the high-capacity energy storage battery can be converted into the DC link of the converter of the wind turbine generator, and the redundant electric energy is fed back into an auxiliary machine of the wind turbine generator and on the power grid.
The wind turbine generator has bypass secondary ferry charging load, so that the fluctuation rate of the internet surfing power of the wind turbine generator is reduced; the system can participate in primary frequency modulation and load peak regulation of the power grid, and high-proportion electric power and electric energy of new energy are added to enter the power grid for consumption; the system can reduce the capacity and investment cost of the electric equipment of the network transmission and transformation channel while reducing the coefficient of the wind power plant.
As a preferable technical scheme, the energy storage battery is connected with the UPS and EPS direct current ring in a power saving way.
The UPS & EPS supplies power to an auxiliary electric loop of the wind turbine generator, and a load of 2-4% pu (rated unit power) is normally supplied by a system power supply of the UPS & EPS with rectification and inversion or a self-contained battery of the UPS & EPS with inversion and power supply; if the energy storage battery is connected with the UPS and the EPS direct current ring in a power saving way, the load of 2-4% pu (rated unit power) can be provided for the energy storage battery, so that the partial load redundancy and the backup function of the technical scheme of the invention are improved, and the charge and discharge are further stabilized. The UPS and EPS direct current link provides redundancy and backup functions, and further plays a role in stabilizing charge and discharge.
As a preferable technical proposal, the utility model also comprises contactors JC connected in series with each other 13 And fuse RD 13 Contactor JC connected in series with each other 23 And fuse RD 23 The UPS (uninterrupted Power supply)&One pole of EPS direct current link passes through contactor JC 13 RD fuse 13 Electrically connected to one pole of the energy storage battery, the UPS&The other pole of the EPS direct current link passes through a contactor JC 23 RD fuse 23 Is electrically connected to the other pole of the energy storage battery.
Because the energy storage battery and the UPS and EPS direct current link are protected by adopting a fuse, and the contactor controls the switching loop, the reliability and the safety of the UPS and EPS direct current link are well ensured. This facilitates ensuring the reliability and safety of the UPS & EPS dc link.
As a preferable technical scheme, the energy storage battery comprises a first energy storage battery and a second energy storage battery which are mutually connected in series, and further comprises a contactor JC which is mutually connected in series 33 And fuse RD 33 Contactor JC connected in series with each other 43 And fuse RD 43 The node between the first energy storage battery and the second energy storage battery passes through a contactor JC 43 RD fuse 43 With the UPS&One pole of the EPS direct current link is electrically connected, and a node between the first energy storage battery and the second energy storage battery is connected with the first energy storage battery through a contactor JC 33 RD fuse 33 With the UPS&The other pole of the EPS DC link is electrically connected.
In order to match the direct-current voltage level of the direct-current link of the wind turbine generator converter, the technical scheme of the invention needs to adopt an energy storage battery with the direct-current voltage range of 400V-1500 VDC; the UPS and EPS DC links of the wind turbine generator may choose a lower DC voltage level, and the UPS and EPS DC links are not compatible when matched with each other. In order to meet the market demand of the lower direct-current voltage level, the direct-current voltage level of the energy storage battery can be selected to be 0.5 times in the UPS and EPS direct-current links; when the energy storage batteries supply power to the UPS & EPS direct current link, the two groups of energy storage batteries are connected in series to change the parallel operation, so that half of direct current voltage level is reduced, the direct current voltage level of the UPS & EPS direct current link is changed, and the operation mode with high matching degree is beneficial to further ensuring the reliability and the safety of the energy storage batteries and the UPS & EPS direct current link. The UPS and EPS direct current link has the function of parallel voltage reduction, and is beneficial to further ensuring the reliability and the safety of the energy storage battery and the UPS and EPS direct current link.
Example 2
As further optimization of embodiment 1, this embodiment includes all the technical features of embodiment 1, as shown in fig. 1 to 3, and in addition, this embodiment further includes the following technical features:
the charging and discharging method for the energy storage battery of the wind turbine generator adopts the charging and discharging circuit for the energy storage battery of the wind turbine generator, and comprises the following charging and discharging modes:
when the wind turbine generator system normally operates, the converter direct current link charges the energy storage battery through the first group of the secondary charging and discharging units or the second group of the secondary charging and discharging units, and the energy storage battery discharges the converter direct current link through the first group of the secondary charging and discharging units or the second group of the secondary charging and discharging units; therefore, the direct current link of the converter charges and discharges the energy storage battery indirectly in a ferry mode, so that the safety reliability of the wind turbine generator converter is ensured, the efficiency of the energy storage battery is improved, and the simultaneous coefficient of a wind power plant is reduced;
when the wind turbine generator is abnormally operated or stopped, the direct current link of the converter charges the energy storage battery through the first bypass charging and discharging unit or the second bypass charging and discharging unit, and the energy storage battery discharges the direct current link of the converter through the first bypass charging and discharging unit or the second bypass charging and discharging unit; the method reduces the electric impact on the direct current links of the energy storage battery and the converter, thereby prolonging the service life of the wind turbine and ensuring the reliability of the wind turbine.
The working principle is as follows:
when the wind turbine generator system normally operates, the direct-current capacitors of the converter with higher direct-current voltage individually charge the super-capacitors with lower direct-current voltage; after the charging is finished, the super capacitor which is charged and has high direct current voltage charges the high-voltage energy storage battery with low direct current voltage. Because the wind turbine generator system is required to run within the range of +/-10% of the internet voltage for a long time, once the direct-current voltage of the direct-current capacitor of the converter is relatively low, the high-voltage energy storage battery with relatively high direct-current voltage can charge the super capacitor with relatively low direct-current voltage independently, and after the wind turbine generator system is charged, the super capacitor with relatively high direct-current voltage charges the direct-current capacitor of the converter with relatively low direct-current voltage independently. Energy of capacitorVariation of its capacity C DeltaU C U CP (△U C U is the variation before and after the variation of the capacitance voltage CP To be the average before and after its capacitance voltage changes).
The ferry type charge and discharge mode fully utilizes the high specific power (W/kg) of the super capacitor, the corresponding charge and discharge speed (millisecond level), the charge and discharge time (1-30 s), the discharge multiplying power is high, the ferry type charge and discharge energy storage device is suitable for the high-frequency pulse electric environment, the charge and discharge times or the cycle life is very high (50 ten thousand times), the operation temperature is low, the upper and lower limit temperature is wide (-40 ℃ -70 ℃), the working voltage resistance is high (1000 VDC), the charge efficiency is high (95%), the reliability is high, the maintenance cost is low, and the structure is simple and no toxic substance exists.
But the specific energy (Wh/kg) of the super capacitor is low, the energy storage period is short (in minutes), higher control voltage is needed, and the rated voltage of a single super capacitor is low; the price is relatively high.
Therefore, the super capacitor is not suitable for large-capacity energy storage with longer period, is very suitable for short-time energy storage with larger acting rate and small energy density, and has good electrical adaptability and environmental adaptability; the price is relatively high.
The specific energy (Wh/kg) of the high-voltage energy storage battery is high, the corresponding charging and discharging speed is high (millisecond level), the discharging time is 0.3-3h, the discharging multiplying power is high, the energy storage period is long (days or weeks), the working withstand voltage is high (800-1000 VDC), the charging efficiency is high (85%), the price is relatively low, and the reliability is high; but the high-voltage energy storage battery has lower specific power (W/kg), the charging time (1-5 h), low charging and discharging times or cycle life (2000 times), narrow temperature range (-15-60 ℃) and poor charging and discharging performance at low temperature, and the problems can be solved by hot mixing and ventilation.
Therefore, the high-voltage energy storage battery is not suitable for high-power energy storage with short period, is very suitable for long-term energy storage with large capacity, has good electrical adaptability under the condition of heat mixing and ventilation, and has good environmental adaptability; the price is relatively low.
The super capacitor is used for increasing the voltage of the energy storage battery, and a ferry type charging and discharging mode is one of the best electric energy storage modes at present.
Example 3
As shown in fig. 1 to 3, this embodiment includes all the technical features of embodiment 1 and embodiment 2, and provides a more detailed embodiment on the basis of embodiment 1 and embodiment 2.
When the wind turbine generator system converter 1 operates normally, a converter direct current link E is adopted c0 4 bypass energy storage battery E 12 16 and a second group of "ferry" type secondary charge and discharge cells, a first group 10 and a second group 11 of secondary charge and discharge cells; when the frequency of the wind turbine generator system on-line power system is larger than rated frequency, the voltage of a direct current bus is larger than rated value, and the on-line power is larger than a charging set value, a converter direct current link E is adopted c0 4 pass through the first group 10 super capacitor C of the secondary charge-discharge unit 1 Second group 11 super capacitor C of 12 or two-stage charge-discharge unit 2 13 indirect pair energy storage battery E 12 16 charging; when the frequency of the wind turbine generator system on-line power system is smaller than the rated frequency, the voltage of the direct-current bus is smaller than the rated value, and the on-line power is smaller than the discharging set value, the energy storage battery E is bypassed 12 The first group 10 of super capacitors C pass through the secondary charge-discharge unit 16 1 Second group 11 super capacitor C of 12 or two-stage charge-discharge unit 2 13 direct current link E of indirect pair converter c0 4, discharging; DC link E of converter c0 4 and energy storage battery E 12 16, but the first group 10 of super-capacitors C of the charge-discharge units 1 Or the second group 11 super-capacitor C of the charging and discharging units 2 And the rotation is independently completed. Wherein the energy storage battery E 12 16 and a ferry type two-stage charge-discharge method, which is divided into a direct current link E of a converter c0 4-second-stage charge-discharge unit first group 10 super capacitor C 1 Second group 11 super capacitor C of 12 or two-stage charge-discharge unit 2 13 → energy storage battery E 12 16 'ferry' type charging method and energy storage battery E 12 16-second-stage charge-discharge unit first group 10 super capacitor C 1 Second group 11 super capacitor C of 12 or two-stage charge-discharge unit 2 13-DC link E of converter c0 4 'ferry' type playing deviceAn electrical method.
DC link E of converter c0 4 bypass energy storage battery E 12 16 and a ferry type secondary charging and discharging device 6, which consists of a first stage unit 7 and a second stage unit 8, or a first group 10 of secondary charging and discharging units and a second group 11 of secondary charging and discharging units; and a first high voltage energy storage block 14 or a second high voltage energy storage block 15. Wherein the first group 10 of the secondary charging and discharging units is formed by a charging switch T of the first stage unit 7 c111 -discharge switch T f111 Charging switch T c112 -discharge switch T f112 And a fuse RD 111 、RD 112 Super capacitor C 1 Charging switch T of second stage unit 8 c121 -discharge switch T f121 Charging switch T c122 -discharge switch T f122 And a fuse RD 121 、RD 122 Composition; the second group 11 of secondary charging and discharging units is switched by the power electronics of the first stage unit 7 or by the switch T c211 -discharge switch T f211 Charging switch T c212 -discharge switch T f212 And a fuse RD 211 、RD 212 Super capacitor C 2 Charging switch T of second stage unit 8 c221 -discharge switch T f221 Charging switch T c222 -discharge switch T f222 And a fuse RD 221 、RD 222 Composition is prepared. The first high-voltage energy storage block 14 is formed by an energy storage battery E 12 16[ two groups of high-capacity energy storage batteries E are contained therein ] 1 X 1 、E 2 X 2 And an intermediate connection contactor JC 03 ]Contactor JC of first-path charge-discharge loop 19 13 And a fuse RD 13 Contactor JC of second charge-discharge circuit 20 23 And a fuse RD 23 In addition, a first bypass is added to charge and discharge 17 of the contactor JC pcf1 And a fuse RD pcf1 And a second bypass charge-discharge 18 contactor JC pcf2 And a fuse RD pcf1 The composition is shown in figure 2; the second high-voltage energy storage block 15 is formed by an energy storage battery E 12 16[ two groups of high-capacity energy storage batteries E are contained therein ] 1 X 1 、E 2 X 2 And an intermediate connection contactor JC 03 ]Contactor JC of first-path charge-discharge loop 19 13 And meltingBreaker RD 13 Contactor JC of second charge-discharge circuit 20 23 And a fuse RD 23 Parallel contactor JC of third-path charge-discharge loop 21 33 And a fuse RD 33 22 parallel contactor JC of fourth-path charge-discharge loop 43 Fuse RD 43 In addition, a first bypass is added to charge and discharge 17 of the contactor JC pcf1 And a fuse RD pcf1 And a second bypass charge-discharge 18 contactor JC pcf2 And a fuse RD pcf1 The composition is shown in FIG. 3.
Charging path one: the first stage unit 7 is charged according to a preset charging voltage target value, and a direct current link E of the converter c0 4, a first group 10 of charge switches T passing through the secondary charge and discharge cells of the first stage unit 7 c111 、T c112 And a fuse RD 111 、RD 112 Is connected with the super capacitor C 1 12 and individually charging them; second-stage charging, second-stage charging and discharging unit super capacitor C of first group 10 1 After 12 is charged, the corresponding charging switch T is disconnected c111 、T c112 Then through the first group 10 of the secondary charge and discharge cells of the secondary cell 8 c121 、T c122 Separately to the high-capacity energy storage battery E connected in parallel with it 12 16 charging; after charging, the charging switch T of the first group 10 of the secondary charging and discharging units of the secondary unit 8 is turned off c121 、T c122 Then, the charging switch T of the first group 10 of the secondary charging and discharging units of the first stage unit 7 is turned on c111 、T c112 Then the converter is used for DC link E c0 4 super capacitor C connected with the same independently 1 12. Subsequently, the super-capacitor C of the second group 11 of secondary charge-discharge cells charged with the target value of the charging voltage is preset in advance in the working order 2 10, DC link E of converter c0 4, a second group 11 of charge switches T passing through the second stage charge-discharge cells of the first stage unit 7 c211 、T c212 And a fuse RD 211 、RD 212 Is connected with the super capacitor C 2 13 and individually charging them; super capacitor C 2 13 after charging, disconnecting the second-stage charge and discharge unit of the first-stage unit 7Two sets 11 of charging switches T c211 、T c212 Then, the charge switch T of the second group 11 of the second stage charge/discharge cells of the second stage cell 8 is turned on c221 、T c222 The super capacitor C24 is used for independently matching the energy storage battery E 12 16 charging; after the charging is completed, the charging switch T of the second group 11 of the second-stage charging and discharging units of the second-stage unit 8 is turned off c221 、T c222 Then, the charging switch T of the second group 11 of the secondary charging and discharging units of the first stage unit 7 is turned on c211 、T c212 Then the converter is used for DC link E c0 4 super capacitor C connected with the same independently 2 13. The first group 10 of secondary charge-discharge cells and the second group 11 of secondary charge-discharge cells are alternately switched between charge and discharge without intermittence or with little gap time. By means of dc link E of current transformer c0 4 bypass two groups of super capacitors C 1 12 and super capacitor C 2 13, alternately connecting the large-capacity energy storage battery E by time-division two-stage ferry 12 16 charging, increasing the preset charging voltage target value in sections and finally reaching the high-capacity energy storage battery E 12 A voltage final value of 16 full of electric energy; thus, through the DC link E of the converter c0 4 by-pass secondary ferry charging method, the redundant electric energy of the wind motor set can be stored into the energy storage battery E with large capacity 12 16.
In the second charging path, when the wind turbine generator is not operating normally, as shown in fig. 2 and 3, the direct current link E of the converter of the wind turbine generator c0 16, the contactor JC of the first bypass charge and discharge 17 passing through the first high-voltage energy storage block 14 or the second high-voltage energy storage block 15 respectively pcf1 RD fuse pcf1 And a second bypass charge-discharge 18 contactor JC pcf2 RD fuse pcf2 Separately for large-capacity energy storage battery E 12 16.
A third charging path, a first group 10 of secondary charging and discharging units and a second group 11 of charging and discharging switches T of secondary charging and discharging units in the second stage unit 8 when the wind turbine generator is not operating normally c121 、T c122 、T c221 、T c222 And T f121 、T f122 、T f221 、T f222 And a first bypass charge/discharge 17Contactor JC pcf1 And a second bypass charge-discharge 18 contactor JC pcf2 Under the condition of disconnection, the wind turbine UPS&EPS network side NPR 1 26 plus UPS&EPS DC link E 3 28, the contactors JC passing through the first path charge-discharge circuit 19 of the first high voltage energy storage block 14 respectively 13 And a fuse RD 13 Contactor JC of the second charge-discharge circuit 20 23 And a fuse RD 23 And an energy storage battery E 12 16 internal two sets of energy storage batteries E 1 And E is 2 Intermediate connection contactor JC 03 23 are closed, separately to two groups of energy storage batteries E 1 And E is 2 In fig. 2, or respectively through the first charging and discharging circuit 19 of the second high voltage energy storage block 15 13 And a fuse RD 13 Contactor JC of the second charge-discharge circuit 20 23 And a fuse RD 23 Contactor JC of third path charging and discharging circuit 21 33 And a fuse RD 33 JC of fourth-path charge-discharge loop 43 And a fuse RD 43 Closure and energy storage battery E 12 16 internal two sets of energy storage batteries E 1 And E is 2 Interval contactor JC 03 Disconnecting, respectively and independently pairing two groups of energy storage batteries E 1 And E is 2 Is shown in fig. 3.
Discharge path one: in fig. 2 and 3, the bypass first stage unit 7 discharges, and the super capacitor C of the first group 10 of the secondary charge and discharge units is charged according to a preset discharge voltage target value 1 12, a discharge switch T of a first group 10 of secondary charge-discharge cells passing through the first stage cell 7 f111 、T f112 Connecting a DC link E of the converter c0 4 and discharging it individually; by-pass second stage unit 8 discharges, and in large-capacity energy storage battery E 12 16 are charged, the discharge switch T of the first group 10 of the secondary charge-discharge cells of the first stage cell 7 is turned off f111 、T f112 Then through the discharge switch T of its second stage unit 8 f121 、T f122 Super-capacitor C of the first group of units connected in parallel with it 1 12, discharging; after discharging, the discharge switch T of the first group 10 of the secondary charge and discharge cells of the secondary cell 8 is turned off f121 、T f122 After that, the discharge switch T of the first stage unit 7 is turned on f111 、T f112 Then by super capacitor C 1 12 are connected with the converter direct current link E independently c0 4. Next, a large-capacity energy storage battery E is discharged according to a preset discharge voltage target value 12 16, by a large-capacity energy storage battery E 12 16 pass through the discharge switch T of the second group 11 of the second-stage charge-discharge cells of the second-stage cell 8 f221 、T f222 Super capacitor C of second group 11 of secondary charging and discharging units 2 13, discharging; after discharging, the discharging switch T of the second group 11 of the second-stage charging and discharging units of the second-stage unit 8 is turned off f221 、T f222 The discharge switch T of the second group 11 of the secondary charge-discharge cells of the first stage cell 7 is turned on f211 、T f212 Then the super capacitor C 2 13 pairs of converter DC links E c0 4 are discharged individually. The first group 10 of secondary charge-discharge cells and the second group 11 of secondary charge-discharge cells are alternately switched between charge and discharge without intermittence or with little gap time. High-capacity energy storage battery E filled with electric energy 12 16, super capacitor C passing through two groups of charge and discharge units 1 12 and super capacitor C 2 13 time-sharing alternating current converter direct current link E c0 4, discharging, namely raising a preset discharging voltage target value in a saving way and finally reaching a voltage final value when the electric energy of the large-capacity energy storage battery is fully charged; thus, through the DC link E of the converter c0 4 bypass high capacity energy storage battery E 12 16 and a ferry type secondary discharging method, the energy storage battery E with large capacity can be obtained 12 Direct current link E of 16 redundant electric energy conversion to wind turbine generator system converter c0 And 4, feeding back the current back to the main loop bus of the converter or the low-voltage bus of the alternating current auxiliary loop of the wind turbine generator at the same time, and supplying auxiliary electric power to and surfing the Internet for the wind turbine generator.
And a discharge path II: wind turbine generator system normal operation, and high-capacity energy storage battery E 12 When 16 is charged, a large-capacity energy storage battery E is needed in the wind turbine generator 12 When the electric energy is supported, in fig. 2, a large-capacity energy storage battery E 12 16 of the third stage unit 9 connected in parallel 13 And a contactor JC of the second charge-discharge circuit 20 23 Closing, solely by UPS&EPS DC link E 3 28, then pass through the UPS&EPS-side MPR 1 27, inverting the direct-current electric energy to a low-voltage bus 29 of an alternating-current auxiliary circuit of the wind turbine; in fig. 3, a large-capacity energy storage battery E 1 X 1 Contactor JC of first-path charge-discharge loop 19 of connected third-stage unit 9 13 And a contactor JC of the second charge-discharge circuit 20 13 From large-capacity energy-storage batteries E 2 X 2 Contactor JC of third-path charge-discharge loop 21 connected 33 And a contactor JC of the fourth charge-discharge circuit 22 43 On/off large-capacity energy storage battery E 1 X 1 And E is 2 X 2 Inter-cell connection contactor JC 03 23, by UPS alone in two groups&EPS DC link E 3 28, then pass through the UPS&EPS-side MPR 1 27 inverts the dc power to the ac auxiliary circuit low voltage bus 29 of the wind turbine.
Third discharge path: wind turbine generator converter side MPR when wind turbine generator is in accident or normal shutdown 0 3, switching off the IGBT; contactor JC of the first path charge-discharge circuit 19 of the third stage unit 9 pdc1 And a fuse RD pdc1 Contactor JC of second charge-discharge circuit 20 pdc2 And a fuse RD pdc2 Closing, by high-capacity energy storage battery E 12 16 direct current link E of converter C0 4 discharge, grid side inverter NPR of converter 0 And 2, converting direct current to a main loop bus 30 of the converter and/or an alternating current auxiliary loop low-voltage bus 29 of the wind turbine, so as to supply auxiliary electric power to the wind turbine and access the internet.
And a discharge path IV: high-capacity energy storage battery E during accident or normal shutdown of wind turbine generator 12 When 16 is charged, a large-capacity energy storage battery E is needed in the wind turbine generator 12 When the electric energy is supported, in fig. 2, a large-capacity energy storage battery E 12 16 of the third stage unit 9 connected in parallel 13 And a contactor JC of the second charge-discharge circuit 20 23 Closing, solely by UPS&EPS DC link E 3 28Through the UPS&EPS-side MPR 1 27, inverting the direct-current electric energy to a low-voltage bus 29 of an alternating-current auxiliary circuit of the wind turbine; in fig. 3, a large-capacity energy storage battery E 1 X 1 Contactor JC of first-path charge-discharge loop 19 of connected third-stage unit 9 13 And a contactor JC of the second charge-discharge circuit 20 13 From large-capacity energy-storage batteries E 2 X 2 Contactor JC of third-path charge-discharge loop 21 connected 33 And a contactor JC of the fourth charge-discharge circuit 22 43 On/off large-capacity energy storage battery E 1 X 1 And E is 2 X 2 Inter-cell connection contactor JC 03 23, by UPS alone in two groups&EPS DC link E 3 28, then pass through the UPS&EPS-side MPR 1 27 inverts the dc power to the ac auxiliary circuit low voltage bus 29 of the wind turbine.
As shown in fig. 2 and 3, the generator 5 passes through the converter side MPR of the converter 1 0 3 and converter DC link E C0 4. Grid-side NPR of converter 0 2, pass through contactor JC 0 32. Switch K 0 31 are connected with the main loop bus 30 of the converter to generate electricity on the internet.
As shown in fig. 2 and 3, the main circuit bus 30 of the converter passes through the switch K 1 33 and auxiliary loop transformer 24, switch K 2 34, connected to UPS&EPS25 via UPS&EPS-side MPR 1 27 and switch K 3 35, are connected to the auxiliary circuit low voltage bus 29.
The converter and the main loop of the generator shown in fig. 2 and 3 can cover the power range of 1-50MW of the generator such as DFIG, PMSG, SCIG, WRIG, EESG. Energy storage battery voltage range: 400-1500VDC.
The wind turbine generator system outputs power for generating active power, and the power is generated and connected to the internet through a converter, wherein a bypass high-capacity energy storage battery, a ferry type secondary charge and discharge device and a charge and discharge method are arranged in a DC link of the converter; in normal operation, the direct-current link equal voltage of the converter is adopted to indirectly perform 'ferry' type secondary charge and discharge on the energy storage battery, so that the safety and reliability of the converter of the wind turbine generator are ensured, and the efficiency of the energy storage battery is improved; in addition, one energy storage battery is arranged to discharge the UPS and the EPS direct current link two. Meanwhile, when the wind turbine generator is abnormally operated and stopped, a path of converter direct current link is further arranged to directly charge the energy storage battery through a bypass, or a path of energy storage battery directly discharges the converter direct current link, a path of UPS (uninterrupted Power supply) and EPS (electric Power storage) direct current link charges the energy storage battery, or a path of energy storage battery discharges the UPS and EPS direct current link.
As described above, the present invention can be preferably implemented.
All of the features disclosed in all of the embodiments of this specification, or all of the steps in any method or process disclosed implicitly, except for the mutually exclusive features and/or steps, may be combined and/or expanded and substituted in any way.
The foregoing description of the preferred embodiment of the invention is not intended to limit the invention in any way, but rather to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The charging and discharging circuit of the energy storage battery of the wind turbine generator is characterized by comprising a converter direct current link, a first group of secondary charging and discharging units, a second group of secondary charging and discharging units, a first bypass charging and discharging unit, a second bypass charging and discharging unit and an energy storage battery, wherein the converter direct current link and the energy storage battery are electrically connected through the first group of secondary charging and discharging units, the second group of secondary charging and discharging units, the first bypass charging and discharging unit and the second bypass charging and discharging unit respectively to form four parallel branches;
The first group of the secondary charging and discharging units comprises a charging switch T c111 Discharge switch T f111 Charging switch T c112 Discharge switch T f112 Super capacitor C1, the charging switch T c111 And the discharge switch T f111 The reverse interlock forms a first reverse interlock switch, the charging switch T c112 And the discharge switch T f112 The reverse interlocking is formed into a second reverse interlocking switch, the direct current link of the current transformer is electrically connected with two poles of the energy storage battery through the first reverse interlocking switch and the second reverse interlocking switch respectively, one pole of the super capacitor C1 is electrically connected with a node between the first reverse interlocking switch and one pole of the energy storage battery, and the other pole of the super capacitor C1 is electrically connected with a node between the second reverse interlocking switch and the other pole of the energy storage battery;
the second group of the secondary charging and discharging units comprises a charging switch T c211 Discharge switch T f211 Charging switch T c212 Discharge switch T f212 Super capacitor C2, the charging switch T c211 And the discharge switch T f211 The reverse interlocking forms a third reverse interlocking switch, and the charging switch T c212 And the discharge switch T f212 The reverse interlocking is formed into a fourth reverse interlocking switch, the direct current link of the current transformer is electrically connected with two poles of the energy storage battery through a third reverse interlocking switch and a fourth reverse interlocking switch respectively, one pole of the super capacitor C2 is electrically connected with a node between the third reverse interlocking switch and one pole of the energy storage battery, and the other pole of the super capacitor C2 is electrically connected with a node between the fourth reverse interlocking switch and the other pole of the energy storage battery;
The energy storage battery is connected with the UPS and EPS direct current ring in a power saving way;
also comprises contactors JC connected in series 13 And fuse RD 13 Contactor JC connected in series with each other 23 And fuse RD 23 The UPS (uninterrupted Power supply)&One pole of EPS direct current link passes through contactor JC 13 RD fuse 13 Electrically connected to one pole of the energy storage battery, the UPS&The other pole of the EPS direct current link passes through a contactor JC 23 RD fuse 23 Electrically connected to the other pole of the energy storage battery;
when the wind turbine generator energy storage battery charging and discharging circuit works, the charging and discharging mode comprises the following steps:
when the wind turbine generator is abnormally operated or stopped, the direct current link of the converter charges the energy storage battery through the first bypass charging and discharging unit or the second bypass charging and discharging unit, and the energy storage battery discharges the direct current link of the converter through the first bypass charging and discharging unit or the second bypass charging and discharging unit.
2. The charging and discharging circuit of a wind turbine generator energy storage battery according to claim 1, wherein the first group of secondary charging and discharging units further comprises a fuse RD 111 RD fuse 112 The fuse RD 111 In series with the first reverse interlocking switch to form a first serial body, the fuse RD 112 The second series connection body is formed by connecting the second reverse interlocking switch in series; the second group of the secondary charge-discharge units further comprises a fuse RD 211 RD fuse 212 The fuse RD 211 A third serial body is formed by being connected with the third reverse interlocking switch in series, the fuse RD 212 And the fourth series body is formed by connecting the fourth reverse interlocking switch in series.
3. The charging and discharging circuit of an energy storage battery of a wind turbine generator according to claim 2, wherein the first group of secondary charging and discharging units further comprises a charging switch T c121 Discharge switch T f121 Charging switch T c122 Discharge switch T f122 The charging switch T c121 And the discharge switch T f121 The reverse interlock forms a fifth reverse interlock switch, the charging switch T c122 And the discharge switch T f122 The reverse interlocking structure comprises a sixth reverse interlocking switch, one end of the fifth reverse interlocking switch is electrically connected to a node between the first serial body and the super capacitor C1, the other end of the fifth reverse interlocking switch is electrically connected to one pole of the energy storage battery, one end of the sixth reverse interlocking switch is electrically connected to a node between the second serial body and the super capacitor C1, and the other end of the sixth reverse interlocking switch is electrically connected to the other pole of the energy storage battery;
The secondary charge-discharge unit is secondThe battery also comprises a charging switch T c211 Discharge switch T f211 Charging switch T c212 Discharge switch T f212 The charging switch T c211 And the discharge switch T f211 The reverse interlock forms a seventh reverse interlock switch, the charging switch T c122 And the discharge switch T f122 The reverse interlock constitutes eighth reverse interlock switch, the one end of seventh reverse interlock switch is electric to be connected in the third serial body with the node between the super capacitor C2, the other end of seventh reverse interlock switch is electric to be connected in one pole of energy storage battery, the one end of eighth reverse interlock switch is electric to be connected in the fourth serial body with the node between the super capacitor C2, the other end of eighth reverse interlock switch is electric to be connected in the other pole of energy storage battery.
4. A wind turbine generator energy storage battery charging and discharging circuit according to claim 3, wherein said first group of secondary charging and discharging units further comprises a fuse RD 121 RD fuse 122 The fuse RD 121 A fifth serial body is formed by being connected with the fifth reverse interlocking switch in series, and the fuse RD 122 A sixth serial body is formed by the sixth reverse interlocking switch, one end of the fifth serial body is electrically connected with a node between the first serial body and the super capacitor C1, the other end of the fifth serial body is electrically connected with one pole of the energy storage battery, one end of the sixth serial body is electrically connected with a node between the second serial body and the super capacitor C1, and the other end of the sixth serial body is electrically connected with the other pole of the energy storage battery;
The second group of the secondary charge-discharge units further comprises a fuse RD 221 RD fuse 222 The fuse RD 221 A seventh serial body is formed by being connected with the seventh reverse interlocking switch in series, the fuse RD 222 An eighth serial body is formed by connecting the eighth reverse interlocking switch in series, one end of the seventh serial body is electrically connected with a node between the third serial body and the super capacitor C2, and the other end of the seventh serial body is connected with the third serial bodyThe end is electrically connected to one pole of the energy storage battery, one end of the eighth serial body is electrically connected to a node between the fourth serial body and the super capacitor C2, and the other end of the eighth serial body is electrically connected to the other pole of the energy storage battery.
5. The charging and discharging circuit of an energy storage battery of a wind turbine generator according to claim 4, wherein the first bypass charging and discharging unit comprises contactors JC connected in series with each other pcf1 RD fuse pcf1 The second bypass charge-discharge unit comprises contactors JC connected in series pcf2 RD fuse pcf1 。
6. The charging and discharging circuit of an energy storage battery of a wind turbine generator according to claim 5, wherein the energy storage battery comprises a first energy storage battery and a second energy storage battery which are connected in series, and further comprises a contactor JC connected in series 33 And fuse RD 33 Contactor JC connected in series with each other 43 And fuse RD 43 The node between the first energy storage battery and the second energy storage battery passes through a contactor JC 43 RD fuse 43 With the UPS&One pole of the EPS direct current link is electrically connected, and a node between the first energy storage battery and the second energy storage battery is connected with the first energy storage battery through a contactor JC 33 RD fuse 33 With the UPS&The other pole of the EPS DC link is electrically connected.
7. A method for charging and discharging an energy storage battery of a wind turbine generator, which adopts the charging and discharging circuit of the energy storage battery of the wind turbine generator according to any one of claims 1 to 6, and is characterized by comprising the following charging and discharging modes:
a. when the wind turbine generator system normally operates, the converter direct current link charges the energy storage battery through the first group of the secondary charging and discharging units or the second group of the secondary charging and discharging units, and the energy storage battery discharges the converter direct current link through the first group of the secondary charging and discharging units or the second group of the secondary charging and discharging units;
b. when the wind turbine generator is abnormally operated or stopped, the direct current link of the converter charges the energy storage battery through the first bypass charging and discharging unit or the second bypass charging and discharging unit, and the energy storage battery discharges the direct current link of the converter through the first bypass charging and discharging unit or the second bypass charging and discharging unit.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1845417A (en) * | 2006-04-10 | 2006-10-11 | 中国科学院电工研究所 | Hybrid energy-storage device for elevator and its controlling method |
| CN102244391A (en) * | 2011-07-12 | 2011-11-16 | 华北电力大学 | Energy storage grid-connected circuit based on lithium batteries and super capacitor and control method thereof |
| JP2013233007A (en) * | 2012-04-27 | 2013-11-14 | Nissan Motor Co Ltd | Battery charger |
| AU2016102104A4 (en) * | 2016-08-22 | 2017-01-19 | Dc Solutions Australia Pty Ltd | Apparatus for starting an electrically cranked engine |
| CN206332459U (en) * | 2016-08-31 | 2017-07-14 | 北京恒源利通电力技术有限公司 | Distribution type photovoltaic energy storage system with super capacitor |
| CN107276203A (en) * | 2017-06-20 | 2017-10-20 | 昆明理工大学 | A kind of photovoltaic battery panel low-voltage electric power storage and high-voltage discharge device, its control method and application |
| CN206932191U (en) * | 2017-06-27 | 2018-01-26 | 星际（重庆）智能装备技术研究院有限公司 | Wind-light storage hybrid power system |
| KR20190100678A (en) * | 2018-02-21 | 2019-08-29 | 박종수 | Discharge Vehicle Jump Start System Using Auxiliary Energy Storage Device |
| CN112421746A (en) * | 2020-11-09 | 2021-02-26 | 江苏科技大学 | Charging and discharging control and management method and device for SC-Li-SC mixed energy storage |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6998822B2 (en) * | 2001-05-15 | 2006-02-14 | Energy Storage Systems Pty Ltd | Power supply for a pulsed load |
| US7667438B2 (en) * | 2004-11-10 | 2010-02-23 | Chrysler Group Llc | Energy storage system with ultracapacitor and switched battery |
| US9871392B2 (en) * | 2010-09-17 | 2018-01-16 | Schumacher Electric Corporation | Portable battery booster |
-
2021
- 2021-09-03 CN CN202111029745.7A patent/CN113890074B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1845417A (en) * | 2006-04-10 | 2006-10-11 | 中国科学院电工研究所 | Hybrid energy-storage device for elevator and its controlling method |
| CN102244391A (en) * | 2011-07-12 | 2011-11-16 | 华北电力大学 | Energy storage grid-connected circuit based on lithium batteries and super capacitor and control method thereof |
| JP2013233007A (en) * | 2012-04-27 | 2013-11-14 | Nissan Motor Co Ltd | Battery charger |
| AU2016102104A4 (en) * | 2016-08-22 | 2017-01-19 | Dc Solutions Australia Pty Ltd | Apparatus for starting an electrically cranked engine |
| CN206332459U (en) * | 2016-08-31 | 2017-07-14 | 北京恒源利通电力技术有限公司 | Distribution type photovoltaic energy storage system with super capacitor |
| CN107276203A (en) * | 2017-06-20 | 2017-10-20 | 昆明理工大学 | A kind of photovoltaic battery panel low-voltage electric power storage and high-voltage discharge device, its control method and application |
| CN206932191U (en) * | 2017-06-27 | 2018-01-26 | 星际（重庆）智能装备技术研究院有限公司 | Wind-light storage hybrid power system |
| KR20190100678A (en) * | 2018-02-21 | 2019-08-29 | 박종수 | Discharge Vehicle Jump Start System Using Auxiliary Energy Storage Device |
| CN112421746A (en) * | 2020-11-09 | 2021-02-26 | 江苏科技大学 | Charging and discharging control and management method and device for SC-Li-SC mixed energy storage |
Non-Patent Citations (1)
| Title |
|---|
| "超级电容在太阳能—蓄电池系统中的应用";魏善义;《中国科技信息》;第43页 * |
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Effective date of registration: 20240521 Address after: 831100 New Industry and Light Industry Zone II, Minsheng Industrial Park, Mulei Kazakh Autonomous County, Changji Hui Autonomous Prefecture, Xinjiang Uygur Autonomous Region Patentee after: Xinjiang Dongfang Wind Power New Energy Co.,Ltd. Country or region after: China Patentee after: Dongfang Electric Wind Power Co.,Ltd. Address before: 618099 No.99, Zhujiang East Road, Jingyang District, Deyang City, Sichuan Province Patentee before: Dongfang Electric Wind Power Co.,Ltd. Country or region before: China |