CN109347153A - A kind of mixed cell cascaded H-bridges energy-storage system single-phase power control method and system - Google Patents
A kind of mixed cell cascaded H-bridges energy-storage system single-phase power control method and system Download PDFInfo
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- CN109347153A CN109347153A CN201811112481.XA CN201811112481A CN109347153A CN 109347153 A CN109347153 A CN 109347153A CN 201811112481 A CN201811112481 A CN 201811112481A CN 109347153 A CN109347153 A CN 109347153A
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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
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J3/38—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
- H02J3/50—Controlling the sharing of the out-of-phase component
Abstract
The present invention provides a kind of mixed cell cascaded H-bridges energy-storage system, comprising: multiple battery cascade units；Power grid is accessed after the multiple battery cascade unit series connection；The battery cascade unit includes capacitor concatenation unit, energy-storage battery module and switch；The energy-storage battery module is in parallel with capacitor concatenation unit again after connecting with switch；It is described switch for according to the energy-storage battery module whether failure, cut-off；It is described to close the switch when energy-storage battery module is normal；When energy-storage battery module failure, the switch is disconnected；At least one energy-storage battery module is normal in the multiple battery cascade power supply.Technical solution provided by the invention can be in cascaded H-bridges energy-storage system in the case where more battery unit failures, voltage support is provided with the capacitor concatenation unit of idle operation, grid-connected requirement can still be reached by making the voltage of cascaded H-bridges energy-storage system, continue to output the active power of energy-storage battery concatenation unit.
Description
Technical field
The present invention relates to field current transformer control fields, and in particular to a kind of mixed cell cascaded H-bridges energy-storage system is single-phase
Poewr control method and system.
Background technique
The generation of electricity by new energy that permeability is continuously improved increases the unstable factor of electric system, promotes in energy internet
In the process, the important way as compensation new energy power station fluctuating power, the demand of scale energy-storage system are higher and higher.Cascade
H bridge energy storage power conversion system is directly accessed power grid after multiple low pressure concatenation units being connected, and has and small, output spy is lost
Property it is good, convenient for control the features such as, can well solve mesohigh large capacity energy-storage system access power grid the problem of.
The prior art demonstrates the more level topological structures of cascaded H-bridges in energy-storage system active power controller, fault-tolerant operation etc.
The advantage of aspect, and point out that phase-shifting carrier wave pulse width modulated applications are in Cascade H compared to other switching signal modulation techniques
Bridge energy-storage system has better output waveform, higher power quality, and reduces the requirement to system switching frequency.
In addition, also having had much for the operation control technology of cascaded H-bridges energy storage PCS under a small number of concatenation unit failures
Research.Currently preparatory redundancy is based on to the control processing technique of concatenation unit failure more and a part of concatenation unit is set, on side
After the failure concatenation unit of road, the research carried out as target using guaranteeing output phase voltage symmetry.For the expansion for avoiding fault coverage,
It needs to carry out failure concatenation unit bypass removal procedure first, bypass mode can be divided into online bypass and shut down two kinds of sides of bypass
Formula, for the setting of online bypass mechanism, there are three kinds of schemes: conventional electromagnetic A.C. contactor, thyristor+rectifier bridge, double
To thyristor.The mode of bypass trouble unit also has bypass at the same level and only two kinds of trouble unit of bypass, in bypass failure level receipts or other documents in duplicate
The mode of adjustment modulation ratio is mostly used to improve the output voltage of system after member.Some scholars point out for cascaded H-bridges energy-storage system
As long as guaranteeing that line voltage is consistent with power grid before and after failure and system can be made to operate normally, injected zero-sequence voltage method is proposed
With neutral point excursion method, guarantee the symmetric relation between line voltage by adjusting the phase of phase voltage, from emulation and experimental result
From the point of view of, above-mentioned control method has good control effect.However, above-mentioned failure operation control is with concatenation unit failure entirely
Afterwards, cell voltage can still reach premised on grid-connected requirement designed by condition, and when battery unit failure can not excessively expire
Foot is grid-connected, and above-mentioned fault control method will fail when requiring, and cannot keep the ability that system continues stable operation.
Summary of the invention
To solve the above problems, the present invention proposes a kind of mixed cell cascaded H-bridges energy-storage system single-phase power control method
And system, it can be real to the control of the active power and reactive power of cascaded H-bridges energy-storage system after more cell malfunctions
Now active power is precisely controlled, the energy of system spare battery unit is enable to continue with.
The purpose of the present invention is adopt the following technical solutions realization:
A kind of mixed cell cascaded H-bridges energy-storage system characterized by comprising multiple battery cascade units；
Power grid is accessed after the multiple battery cascade unit series connection；
The battery cascade unit includes capacitor concatenation unit, energy-storage battery module and switch；
The energy-storage battery module is in parallel with capacitor concatenation unit again after connecting with switch；
The switch is used for, according to the energy-storage battery module whether failure, cut-off；Energy-storage battery module is normal
When, it is described to close the switch；When energy-storage battery module failure, the switch is disconnected；
At least one energy-storage battery module is normal in the multiple battery cascade power supply.
Preferably, the capacitor concatenation unit includes: single-phase H bridge power conversion module and capacitor；
The single-phase H bridge power conversion module and capacitor are in parallel.
Preferably, the battery cascade unit further includes the first reactor；First reactor is connected with the switch.
Preferably, battery cascade element number is in battery cascade unit preset in power grid energy-storage system in the system
The quantity for the concatenation unit that single-phase H bridge power conversion module operates normally.
Preferably, the system also includes the second reactors；Second reactor is connected with the battery cascade unit.
A kind of parameter determination method of mixed cell cascaded H-bridges energy-storage system, which comprises
According to pre-set mixed cell cascaded H-bridges energy-storage system active power and reactive power, grid-connected current is calculated
The angle absolute value of vector and network voltage vector；
According to the angle absolute value of grid-connected current vector and network voltage vector, calculate capacitor concatenation unit voltage vector with
Angle absolute value between network voltage vector；
According to the angle absolute value between capacitor concatenation unit voltage vector and network voltage vector, LITHIUM BATTERY receipts or other documents in duplicate is calculated
Angle between first voltage vector and network voltage vector determines battery cascade cell voltage vector operating point.
Preferably, the angle absolute value of the grid-connected current vector and network voltage is calculated as the following formula:
In formula,Angle between grid-connected current vector and network voltage vector；P: active power Q: reactive power.
Preferably, there are the constraint relationships between the active power and reactive power, are shown below:
In formula, Ur1: battery cascade cell voltage amplitude；Us: grid voltage amplitude, S: apparent energy；P: active power Q:
Reactive power；
Wherein, battery cascade cell voltage amplitude Ur1It is calculated as the following formula:
In formula, M: given battery cascade cell voltage vectorModulation ratio；Ubattery: remaining normal battery concatenation unit
Total voltage.
Preferably, the angle absolute value between the capacitor concatenation unit voltage vector and network voltage vector as the following formula into
Row calculates:
In formula: δ1: the angle between capacitor concatenation unit voltage vector and network voltage vector.
Preferably, the angle between the battery cascade cell voltage vector and network voltage vector is counted as the following formula
It calculates:
In formula, δ: the angle between battery cascade cell voltage vector and network voltage vector.
Preferably, the angle absolute value between the battery cascade cell voltage vector and network voltage vector as the following formula into
Row calculates:
In formula, Ur1: battery cascade cell voltage amplitude；Us: grid voltage amplitude.
Preferably, the determining battery cascade cell voltage vector operating point is calculated as the following formula:
A kind of parameter determination system of mixed cell cascaded H-bridges energy-storage system, system include: the first computing module, second
Computing module and determining module；
First computing module: for according to pre-set mixed cell cascaded H-bridges energy-storage system active power and idle
Power calculates the angle absolute value of grid-connected current vector and network voltage vector；
Second computing module: for the angle absolute value according to grid-connected current vector and network voltage vector, capacitor is calculated
Angle absolute value between concatenation unit voltage vector and network voltage vector；
Determining module: for according to the angle absolute value between capacitor concatenation unit voltage vector and network voltage vector,
The angle for calculating battery cascade cell voltage vector and network voltage vector, determines battery cascade cell voltage vector operating point.
A kind of mixed cell cascaded H-bridges energy-storage system single-phase power control method, which comprises
The battery cascade cell voltage fortune obtained according to the parameter determination method of the mixed cell cascaded H-bridges energy-storage system
Row point carries out closed-loop control to capacitor concatenation unit voltage, obtains the reference voltage of capacitor concatenation unit voltage；
According to the reference voltage of the capacitor concatenation unit voltage, single-phase power is controlled.
Preferably, the LITHIUM BATTERY receipts or other documents in duplicate obtained according to the parameter determination method of the mixed cell cascaded H-bridges energy-storage system
First voltage operating point；Closed-loop control is carried out to capacitor concatenation unit voltage, obtains the reference voltage packet of capacitor concatenation unit voltage
It includes:
Capacitor concatenation unit DC voltage reference value makes the difference compared with capacitor concatenation unit DC voltage, adjusts through PI
Afterwards, output watt current component amplitude；
Active power reference value makes the difference compared with the active power of battery cascade unit reality output, defeated after PI is adjusted
Reactive current component amplitude out；
Sampling network voltage obtains corresponding phase angle by phaselocked loop, then by active current amplitude and phase
Angle sine value is multiplied, and reactive current component amplitude is multiplied with phase angle cosine value, and the inner ring that two electric currents synthesize is instantaneously electric
Flow given value, compared with system feedback electric current after obtain error amount, by P adjust obtain voltage deviation regulated quantity；
Network voltage and battery cascade cell voltage generated after making the difference reactive voltage component again with voltage deviation regulated quantity ratio
The reference voltage of capacitor concatenation unit is obtained after relatively making the difference.
Preferably, the reference voltage according to the capacitor concatenation unit voltage, carrying out control to single-phase power includes:
The reference voltage output of the capacitor concatenation unit voltage to phase-shifting carrier wave sinusoidal pulse width modulation trigger pulse is sent out
Raw device, generates switching tube trigger pulse, controls single-phase power by the switching tube trigger pulse.
A kind of mixed cell cascaded H-bridges energy-storage system single-phase power control system, the system comprises: computing module and control
Molding block；
Voltage computing module: for the operating point according to the battery cascade cell voltage, to capacitor concatenation unit voltage
Closed-loop control is carried out, the reference voltage of capacitor concatenation unit voltage is obtained；
Power control module: for the reference voltage according to the capacitor concatenation unit voltage, single-phase power is controlled
System.
With immediate prior art ratio, technical solution provided by the invention is had the advantages that
Technical solution provided by the invention, can be in cascaded H-bridges energy-storage system in the case where more battery unit failures, will
Energy-storage battery module failure and the normal concatenation unit of power conversion module uses, with the capacitor level receipts or other documents in duplicate of idle operation
Member provides voltage support, makes the voltage of cascaded H-bridges energy-storage system that can still reach grid-connected requirement, by energy-storage battery concatenation unit
Active power continue to output, the energy of remaining tandem cell unit is continued with.
Technical solution provided by the invention, can be after more cell malfunctions, using battery cascade cell voltage
The method of opened loop control and the control of capacitor concatenation unit voltage close loop, active power and idle function to cascaded H-bridges energy-storage system
Rate is controlled, and is precisely controlled to realize to active power, the energy of system spare battery unit is enable to continue with.
Monophase system power control had both may be implemented in the present invention, has preferable applicability, solves because of more battery units
The problem of cascaded H-bridges energy-storage system is unable to run caused by failure improves the utilization rate of cascaded H-bridges energy-storage system, increases warp
Ji benefit.
Detailed description of the invention
Fig. 1 is a kind of topological structure schematic diagram of mixed cell cascaded H-bridges energy-storage system of the present invention；
Fig. 2 is the topologies change schematic diagram of mixed cell cascaded H-bridges energy-storage system of the present invention；
Fig. 3 is a kind of parameter determination method schematic diagram of mixed cell cascaded H-bridges energy-storage system of the present invention；
Fig. 4 is a kind of mixed cell cascaded H-bridges energy-storage system single-phase power control method schematic diagram of the present invention；
Fig. 5 is a kind of parameter determination system schematic diagram of mixed cell cascaded H-bridges energy-storage system of the present invention；
Fig. 6 is a kind of mixed cell cascaded H-bridges energy storage single-phase power control system schematic diagram of the present invention；
Fig. 7 is the topological structure schematic diagram of the single-phase cascaded H-bridges energy-storage system of 35kV of the present invention；
Fig. 8 is each electric vector relation schematic diagram of the present invention；
Fig. 9 is capacitor concatenation unit voltage close loop control schematic diagram of the present invention；
Figure 10 is the single-phase power control simulation model of mixed cell cascaded H-bridges energy-storage system of the present invention；
Figure 11 is P=500kW of the present invention, the power output of Q=-1.25Mvar mixed cell cascaded H-bridges energy-storage system；
Figure 12 is P=500kW of the present invention, the power output of Q=-1.25Mvar mixed cell cascaded H-bridges energy-storage system；
Figure 13 is that the active power of mixed cell cascaded H-bridges energy-storage system of the present invention is adjusted by 0.5MW to 1MW.
Specific embodiment party
For a better understanding of the present invention, following will be combined with the drawings in the embodiments of the present invention, in the embodiment of the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.
Embodiment one,
Energy accumulation current converter (Power Control System--PCS) can control the charging and discharging process of battery, into
The transformation of row alternating current-direct current can directly power under no grid condition for AC load.PCS is by DC/AC bidirectional converter, control
Unit etc. is constituted.PCS controller receives Background control instruction by communication, controls unsteady flow according to the symbol of power instruction and size
Device is charged the battery or is discharged, and realizes the adjusting to network re-active power and reactive power.PCS controller is connect by CAN
It mouthful is communicated with BMS, obtains battery state information, it can be achieved that protectiveness charge and discharge to battery, it is ensured that battery operation safety.
Energy accumulation current converter (PCS) can control the charging and discharging process of battery, the transformation of alternating current-direct current be carried out, in no power grid
In the case of can directly for AC load power.PCS is made of DC/AC bidirectional converter, control unit etc..PCS controller is logical
It crosses communication and receives Background control instruction, charge the battery or put according to the symbol of power instruction and size control current transformer
Electricity realizes the adjusting to network re-active power and reactive power.PCS controller is communicated by CAN interface and BMS, obtains battery
Group status information is, it can be achieved that protectiveness charge and discharge to battery, it is ensured that battery operation safety.
A kind of mixed cell cascaded H-bridges energy-storage system, as shown in Figure 1, comprising: multiple battery cascade units；
Power grid is accessed after the multiple battery cascade unit series connection；
The battery cascade unit includes capacitor concatenation unit, energy-storage battery module and switch；
The energy-storage battery module is in parallel with capacitor concatenation unit again after connecting with switch；
The switch is used for, according to the energy-storage battery module whether failure, cut-off；Energy-storage battery module is normal
When, it is described to close the switch；When energy-storage battery module failure, the switch is disconnected；
At least one energy-storage battery module is normal in the multiple battery cascade power supply.
Specifically, the capacitor concatenation unit includes: single-phase H bridge power conversion module and capacitor；
The single-phase H bridge power conversion module and capacitor are in parallel.
Specifically, the battery cascade unit further includes the first reactor；First reactor is connected with the switch.
Specifically, battery cascade element number is in battery cascade unit preset in power grid energy-storage system in the system
The quantity for the concatenation unit that single-phase H bridge power conversion module operates normally.
Specifically, the system also includes the second reactors；Second reactor is connected with the battery cascade unit.
When battery cascade unit works normally, switch is in closed state.Energy-storage battery module event in battery cascade unit
After barrier, switch is disconnected, and accesses electricity as capacitor concatenation unit in the case where single-phase H bridge power conversion module can be operated normally
Net.Energy-storage system topologies change is as shown in Fig. 2, battery cascade unit MiIn the case where energy-storage battery module failure, open
Shutdown is opened, and is accessed power grid as capacitor concatenation unit, is formed the concatenation unit H bridge energy-storage system of mixing.
Since the fault condition of single-phase battery concatenation unit preset in energy-storage system is uncertain, mixed cell cascade
The series winding form of battery cascade unit and capacitor concatenation unit needs the failure feelings based on battery cascade unit in H bridge energy-storage system
What condition was determined.
Embodiment two,
A kind of parameter determination method of mixed cell cascaded H-bridges energy-storage system, as shown in Figure 3, which comprises
Step 1: according to pre-set mixed cell cascaded H-bridges energy-storage system active power and reactive power, calculating simultaneously
The angle absolute value of net current phasor and network voltage vector；
Step 2: according to the angle absolute value of grid-connected current vector and network voltage vector, calculating capacitor concatenation unit voltage
Angle absolute value between vector and network voltage vector；
Step 3: according to the angle absolute value between capacitor concatenation unit voltage vector and network voltage vector, calculating battery
Angle between concatenation unit voltage vector and network voltage vector determines battery cascade cell voltage vector operating point.
Step 1: according to pre-set mixed cell cascaded H-bridges energy-storage system active power and reactive power, calculating simultaneously
The angle absolute value of net current phasor and network voltage vector.
Specifically, the angle absolute value of the grid-connected current vector and network voltage is calculated as the following formula:
In formula,Angle between grid-connected current vector and network voltage vector；P: active power Q: reactive power.
Specifically, there are the constraint relationships between the active power and reactive power, are shown below:
In formula, Ur1: battery cascade cell voltage amplitude；Us: grid voltage amplitude, S: apparent energy；P: active power Q:
Reactive power；
Wherein, battery cascade cell voltage amplitude Ur1It is calculated as the following formula:
In formula,Battery cascade cell voltage vector；M: given battery cascade cell voltage vectorModulation ratio；
Ubattery: remaining normal battery concatenation unit total voltage.
Step 2: according to the angle absolute value of grid-connected current vector and network voltage vector, calculating capacitor concatenation unit voltage
Angle absolute value between vector and network voltage vector.
Specifically, the angle absolute value between the capacitor concatenation unit voltage vector and network voltage vector carries out as the following formula
It calculates:
In formula: δ1: the angle between capacitor concatenation unit voltage vector and network voltage vector.
Step 3: according to the angle absolute value between capacitor concatenation unit voltage vector and network voltage vector, calculating battery
Angle between concatenation unit voltage vector and network voltage vector determines battery cascade cell voltage vector operating point.
Specifically, the angle between the battery cascade cell voltage vector and network voltage vector is counted as the following formula
It calculates:
In formula, δ: the angle between battery cascade cell voltage vector and network voltage vector.
Specifically, the angle absolute value between the battery cascade cell voltage vector and network voltage vector as the following formula into
Row calculates:
In formula, Ur1: battery cascade cell voltage amplitude；Us: grid voltage amplitude.
Specifically, the determining battery cascade cell voltage vector operating point is calculated as the following formula:
Embodiment three,
A kind of mixed cell cascaded H-bridges energy-storage system single-phase power control method, as shown in Figure 4, which comprises
Step 4: the battery cascade cell voltage obtained according to the parameter determination method of mixed cell cascaded H-bridges energy-storage system
Operating point carries out closed-loop control to capacitor concatenation unit voltage, obtains the reference voltage of capacitor concatenation unit voltage；
Step 5: according to the reference voltage of the capacitor concatenation unit voltage, single-phase power being controlled；
Step 4: the battery cascade unit obtained according to the parameter determination method of the mixed cell cascaded H-bridges energy-storage system
Voltage operating point carries out closed-loop control to capacitor concatenation unit voltage, obtains the reference voltage of capacitor concatenation unit voltage, such as schemes
Shown in 9, comprising:
Capacitor concatenation unit DC voltage reference value makes the difference compared with capacitor concatenation unit DC voltage, adjusts through PI
Afterwards, output watt current component amplitude；
Active power reference value makes the difference compared with the active power of energy-storage battery concatenation unit reality output, adjusts through PI
Afterwards, reactive current component amplitude is exported；
Sampling network voltage obtains corresponding phase angle by phaselocked loop, then by active current amplitude and phase
Angle sine value is multiplied, and reactive current component amplitude is multiplied with phase angle cosine value, and the inner ring that two electric currents synthesize is instantaneously electric
Flow given value, compared with system feedback electric current after obtain error amount, by P adjust obtain voltage deviation regulated quantity；
Network voltage and battery cascade cell voltage generate reactive voltage component after making the difference, then with voltage deviation regulated quantity ratio
The reference voltage of capacitor concatenation unit is obtained after relatively making the difference.
Step 5: according to the reference voltage of the capacitor concatenation unit voltage, carrying out control to single-phase power includes:
The reference voltage output of the capacitor concatenation unit voltage to phase-shifting carrier wave sinusoidal pulse width modulation trigger pulse is sent out
Raw device, generates switching tube trigger pulse, controls single-phase power by the switching tube trigger pulse.
P adjusting is proportion adjustment, and for the error amount that zooms in or out, the degree of regulation that P is adjusted is lower, but system responds
Fastly, it does not shake.
Example IV,
A kind of parameter determination system of mixed cell cascaded H-bridges energy-storage system, as shown in Figure 5, comprising: first calculates mould
Block, the second computing module and determining module；
First computing module: according to pre-set mixed cell cascaded H-bridges energy-storage system active power and reactive power,
Calculate the angle absolute value of grid-connected current vector and network voltage vector；
Second computing module: for the angle absolute value according to grid-connected current vector and network voltage vector, capacitor is calculated
Angle absolute value between concatenation unit voltage vector and network voltage vector；
Determining module: for according to the angle absolute value between capacitor concatenation unit voltage vector and network voltage vector,
The angle for calculating battery cascade cell voltage vector and network voltage vector, determines battery cascade cell voltage vector operating point.
Specifically, in the first computing module, the angle absolute value of the grid-connected current vector and network voltage as the following formula into
Row calculates:
In formula,Angle between grid-connected current vector and network voltage vector；P: active power Q: reactive power.
Specifically, the folder in the second computing module, between the capacitor concatenation unit voltage vector and network voltage vector
Angle absolute value is calculated as the following formula:
In formula: δ1: the angle between capacitor concatenation unit voltage vector and network voltage vector；Grid-connected current vector with
Angle between network voltage vector.
Specifically, the angle between the battery cascade cell voltage vector and network voltage vector is counted as the following formula
It calculates:
In formula, δ: the angle between battery cascade cell voltage vector and network voltage vector；P: active power Q: idle
Power.
Specifically, the determining battery cascade cell voltage vector operating point is calculated as the following formula:
In formula,Battery cascade cell voltage vector；δ: battery cascade cell voltage vector and network voltage vector it
Between angle.
Embodiment five,
A kind of mixed cell cascaded H-bridges energy-storage system single-phase power control system, as shown in fig. 6, the system comprises: electricity
Press computing module and power control module；
Voltage computing module: for obtaining electricity according to the parameter determination method of the mixed cell cascaded H-bridges energy-storage system
The operating point of pond concatenation unit voltage；Closed-loop control is carried out to capacitor concatenation unit voltage, obtains capacitor concatenation unit voltage
Reference voltage；
Power control module: for the reference voltage according to the capacitor concatenation unit voltage, single-phase power is controlled
System.
Specifically, capacitor is cascaded according to the operating point of the battery cascade cell voltage in the voltage computing module
Cell voltage carries out closed-loop control, obtains the reference voltage of capacitor concatenation unit voltage, as shown in Figure 9, comprising:
Capacitor concatenation unit DC voltage reference value makes the difference compared with capacitor concatenation unit DC voltage, adjusts through PI
Afterwards, output watt current component amplitude；
Active power reference value makes the difference compared with the active power of energy-storage battery concatenation unit reality output, adjusts through PI
Afterwards, reactive current component amplitude is exported；
Sampling network voltage obtains corresponding phase angle by phaselocked loop, then by active current amplitude and phase
Angle sine value is multiplied, and reactive current component amplitude is multiplied with phase angle cosine value, and the inner ring that two electric currents synthesize is instantaneously electric
Flow given value, compared with system feedback electric current after obtain error amount, by P adjust obtain voltage deviation regulated quantity；
Network voltage and battery cascade cell voltage generate reactive voltage component after making the difference, then with voltage deviation regulated quantity ratio
The reference voltage of capacitor concatenation unit is obtained after relatively making the difference.
Specifically, the reference voltage according to capacitor concatenation unit voltage in the power control module, to single-phase function
Rate carries out control
The reference voltage output of the capacitor concatenation unit voltage to phase-shifting carrier wave sinusoidal pulse width modulation trigger pulse is sent out
Raw device, generates switching tube trigger pulse, controls single-phase power by the switching tube trigger pulse.
Embodiment six,
The single-phase cascaded H-bridges energy-storage system of one 35kV, topological structure are as shown in Figure 7.Inside capacitor stage receipts or other documents in duplicate meta-model by
The capacitor of single-phase H bridge power conversion module and 160mF are connected in parallel, and are turned inside battery cascade model of element by single-phase H bridge power
Mold changing block, capacitor and DC voltage source are connected in parallel composition.
Mixed cell cascaded H-bridges energy-storage system solely can not convey pure active power to power grid, in conveying active power
While need to compensate certain reactive power and be supported, and the property of the reactive power of capacitor concatenation unit compensation with mix
The whole reactive compensation characteristic of unit cascaded H bridge energy-storage system is consistent, and otherwise system is unable to operate normally.Mixed cell cascade
H bridge energy-storage system there are four kinds of operational modes: system charging, compensate capacitive reactive power；System charging, compensates inductive reactive power；System
System electric discharge, compensates capacitive reactive power；System discharge supplements inductive reactive power.The electric vector of mixed cell cascaded H-bridges energy-storage system closes
System is as shown in figure 8, the syntactics under different operational modes between each electrical quantity are as shown in the table.
Syntactics under the different operational modes of table 1 between each electrical quantity
Capacitor concatenation unit voltage and capacitor concatenation unit voltage ratio: U are setr1:Ur2U is arranged in=1:2r1=11745V,
Ur2=11745 × 2=23490V, single-phase mains voltage amplitude areDC bus capacitor
For 160mF.By taking system operates in inductive reactive power operating condition as an example, can acquire battery cascade cell voltage by system setting can be determined
Instruct the relationship between reactive power Q and active power: Q < -2.22P.When system carries out active charging, system command is set
Active power is P=500kW, and settable reactive power command value is 500 × (- 2.5)=- 1250kvar in Q value range,
δ=- 42.835 ° at this time.
By system simulation model, as shown in Figure 10, power output situation is emulated.
As shown in figure 11, from simulation waveform it can be seen that system active power of output and reactive power are realized substantially to finger
Enable the tracking of power, it can be seen that perceptual state (setting perception to be negative), system command charge power P=is presented in reactive power
500kW instructs reactive power Q=- 1.25Mvar, meets the Q=-2.5P relationship being tentatively arranged, the only fluctuation of reactive power
It is opposite to want larger, demonstrate the correctness of Poewr control method.
When not changing δ angle, change system command charge power is P=1MW, is closed according to the Q=-2.5P being tentatively arranged
System, it should instruct reactive power Q=- 2.5Mvar, the actual conditions of simulated power output are as shown in figure 12, instruct charge power
For P=1MW, reactive power Q=- 2.3Mvar is instructed, active power realizes accurate tracking, and reactive power occurs slight inclined
Difference.
As shown in figure 13, when system operation active power is promoted to 1MW by 500kW, it can be seen that the dynamic tune of system
It is very short to have suffered journey, biggish fluctuation does not occur for output power, and tracking accuracy still keeps preferable horizontal.
Above-mentioned true explanation, mixed cell cascaded H-bridges energy-storage system single-phase power parameter determination side provided in this embodiment
Method and system and single-phase power control method can active power to cascaded H-bridges energy-storage system and reactive power control,
It realizes and active power is precisely controlled, improve the utilization rate of cascaded H-bridges energy-storage system.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although referring to above-described embodiment pair
The present invention is described in detail, those of ordinary skill in the art still can to a specific embodiment of the invention into
Row modification perhaps equivalent replacement these without departing from any modification of spirit and scope of the invention or equivalent replacement, applying
Within pending claims of the invention.
Claims (17)
1. a kind of mixed cell cascaded H-bridges energy-storage system characterized by comprising multiple battery cascade units；
Power grid is accessed after the multiple battery cascade unit series connection；
The battery cascade unit includes capacitor concatenation unit, energy-storage battery module and switch；
The energy-storage battery module is in parallel with capacitor concatenation unit again after connecting with switch；
It is described switch for according to the energy-storage battery module whether failure, cut-off；It is described when energy-storage battery module is normal
It closes the switch；When energy-storage battery module failure, the switch is disconnected；
At least one energy-storage battery module is normal in the multiple battery cascade power supply.
2. the system as claimed in claim 1, which is characterized in that the capacitor concatenation unit includes: single-phase H bridge power modulus of conversion
Block and capacitor；
The single-phase H bridge power conversion module and capacitor are in parallel.
3. the system as claimed in claim 1, which is characterized in that the battery cascade unit further includes the first reactor；It is described
First reactor is connected with the switch.
4. system as claimed in claim 2, which is characterized in that battery cascade element number is power grid energy storage system in the system
The quantity for the concatenation unit that single-phase H bridge power conversion module operates normally in preset battery cascade unit in system.
5. the system as claimed in claim 1, which is characterized in that further include the second reactor；Second reactor with it is described
The series connection of battery cascade unit.
6. a kind of parameter determination method of mixed cell cascaded H-bridges energy-storage system, which is characterized in that the described method includes:
According to pre-set mixed cell cascaded H-bridges energy-storage system active power and reactive power, grid-connected current vector is calculated
With the angle absolute value of network voltage vector；
According to the angle absolute value of grid-connected current vector and network voltage vector, capacitor concatenation unit voltage vector and power grid are calculated
Angle absolute value between voltage vector；
According to the angle absolute value between capacitor concatenation unit voltage vector and network voltage vector, battery cascade unit electricity is calculated
The angle between vector and network voltage vector is pressed, determines battery cascade cell voltage vector operating point.
7. method as claimed in claim 6, which is characterized in that the angle absolute value of the grid-connected current vector and network voltage is pressed
Following formula is calculated:
In formula,Angle between grid-connected current vector and network voltage vector；P: active power Q: reactive power.
8. method as claimed in claim 7, which is characterized in that there are the constraint relationship between the active power and reactive power,
It is shown below:
In formula, Ur1: battery cascade cell voltage amplitude；Us: grid voltage amplitude, S: apparent energy；P: active power Q: idle
Power；
Wherein, battery cascade cell voltage amplitude Ur1It is calculated as the following formula:
In formula, M: given battery cascade cell voltage vectorModulation ratio；Ubattery: remaining normal battery concatenation unit is always electric
Pressure.
9. method as claimed in claim 7, which is characterized in that the capacitor concatenation unit voltage vector and network voltage vector it
Between angle absolute value calculated as the following formula:
In formula: δ1: the angle between capacitor concatenation unit voltage vector and network voltage vector.
10. control method as claimed in claim 9, which is characterized in that the battery cascade cell voltage vector and network voltage
Angle between vector is calculated as the following formula:
In formula, δ: the angle between battery cascade cell voltage vector and network voltage vector.
11. method as claimed in claim 10, which is characterized in that the battery cascade cell voltage vector and network voltage vector
Between angle absolute value calculated as the following formula:
In formula, Ur1: battery cascade cell voltage amplitude；Us: grid voltage amplitude.
12. method as claimed in claim 11, which is characterized in that the determining battery cascade cell voltage vector operating point is pressed
Formula is calculated:
13. a kind of parameter determination system of mixed cell cascaded H-bridges energy-storage system characterized by comprising first calculates mould
Block, the second computing module and determining module；
First computing module: being used for according to pre-set mixed cell cascaded H-bridges energy-storage system active power and reactive power,
Calculate the angle absolute value of grid-connected current vector and network voltage vector；
Second computing module: for the angle absolute value according to grid-connected current vector and network voltage vector, capacitor cascade is calculated
Angle absolute value between cell voltage vector and network voltage vector；
Determining module: for calculating according to the angle absolute value between capacitor concatenation unit voltage vector and network voltage vector
The angle of battery cascade cell voltage vector and network voltage vector determines battery cascade cell voltage vector operating point.
14. a kind of single-phase power control method of mixed cell cascaded H-bridges energy-storage system, which is characterized in that the described method includes:
The battery cascade cell voltage vector operating point pair obtained according to any parameter determination method of claim 6-12
Capacitor concatenation unit voltage carries out closed-loop control, obtains the reference voltage of capacitor concatenation unit voltage；
According to the reference voltage of the capacitor concatenation unit voltage, single-phase power is controlled.
15. method as claimed in claim 14, which is characterized in that the operating point according to the battery cascade cell voltage,
Closed-loop control is carried out to capacitor concatenation unit voltage, the reference voltage for obtaining capacitor concatenation unit voltage includes:
Capacitor concatenation unit DC voltage reference value makes the difference compared with capacitor concatenation unit DC voltage, after PI is adjusted,
Output watt current component amplitude；
Active power reference value makes the difference compared with the active power of battery cascade unit reality output, after PI is adjusted, exports nothing
Function current component amplitude；
Sampling network voltage obtains corresponding phase angle by phaselocked loop, then just by active current amplitude and phase angle
String value is multiplied, and reactive current component amplitude is multiplied with phase angle cosine value, the inner ring transient current that two electric currents synthesize to
Definite value, compared with system feedback electric current after obtain error amount, using P adjust obtain voltage deviation regulated quantity；
Network voltage and battery cascade cell voltage generate reactive voltage component after making the difference, then do compared with voltage deviation regulated quantity
The reference voltage of capacitor concatenation unit is obtained after difference.
16. method as claimed in claim 14, which is characterized in that the reference electricity according to the capacitor concatenation unit voltage
Pressure, carrying out control to single-phase power includes:
By the reference voltage output of the capacitor concatenation unit voltage to phase-shifting carrier wave sinusoidal pulse width modulation trigger generator,
Switching tube trigger pulse is generated, single-phase power is controlled by the switching tube trigger pulse.
17. a kind of mixed cell cascaded H-bridges energy-storage system single-phase power control system, the system comprises: computing module and control
Molding block；
Voltage computing module: for the operating point according to the battery cascade cell voltage, capacitor concatenation unit voltage is carried out
Closed-loop control obtains the reference voltage of capacitor concatenation unit voltage；
Power control module: for the reference voltage according to the capacitor concatenation unit voltage, single-phase power is controlled.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113726190A (en) * | 2021-08-12 | 2021-11-30 | 许继集团有限公司 | Fault classification-based fault processing method and device for in-phase power supply device |
| CN114448228A (en) * | 2022-04-11 | 2022-05-06 | 南京力骏新能源储能研究院有限公司 | Redundancy control method and system of direct-hanging energy storage converter based on port voltage state discrimination |
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| JP2003102130A (en) * | 2001-09-20 | 2003-04-04 | Tohoku Electric Power Co Inc | Power storage system |
| CN102420533A (en) * | 2011-12-04 | 2012-04-18 | 中国科学院电工研究所 | Hybrid multilevel current conversion circuit topology structure and control method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003102130A (en) * | 2001-09-20 | 2003-04-04 | Tohoku Electric Power Co Inc | Power storage system |
| CN102420533A (en) * | 2011-12-04 | 2012-04-18 | 中国科学院电工研究所 | Hybrid multilevel current conversion circuit topology structure and control method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113726190A (en) * | 2021-08-12 | 2021-11-30 | 许继集团有限公司 | Fault classification-based fault processing method and device for in-phase power supply device |
| CN114448228A (en) * | 2022-04-11 | 2022-05-06 | 南京力骏新能源储能研究院有限公司 | Redundancy control method and system of direct-hanging energy storage converter based on port voltage state discrimination |
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