CN109995066A - A kind of control method of single-phase chain type power electronics energy accumulation current converter - Google Patents
A kind of control method of single-phase chain type power electronics energy accumulation current converter Download PDFInfo
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- CN109995066A CN109995066A CN201910271414.0A CN201910271414A CN109995066A CN 109995066 A CN109995066 A CN 109995066A CN 201910271414 A CN201910271414 A CN 201910271414A CN 109995066 A CN109995066 A CN 109995066A
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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
- H02J3/48—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
- H02J3/38—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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention provides a kind of control method of single-phase chain type power electronics energy accumulation current converter, and the control of entire energy accumulation current converter is divided into four processes: energy-storage battery SOC control ring, energy-storage units cascade inverter current control ring, network voltage locking phase and energy-storage units SOC balance control.Purpose be to provide a kind of energy-storage battery suitable for different voltages grade, different residual capacity it is unit cascaded after energy accumulation current converter control method, improve the utilization rate of energy-storage battery, it selects the battery of energy storage device more flexible, while making it possible that A-battery accesses medium voltage network use.
Description
Technical field
The present invention relates to energy accumulation current converter control algorithm design technical field, in particular to a kind of single-phase chain type power electronics
The control method of energy accumulation current converter.
Background technique
In the Basic Topological of multilevel converter, cascaded H-bridges topological structure needs minimal number of device, is not required to
The advantages that wanting a large amount of clamp diode and striding capacitance and being easy to modularization, it is considered to be more suitable for changing for grid interface
Flow device.
It is limited to the technological development of battery, general large capacity energy storage device generallys use the topological structure of multi-machine parallel connection, so
After access low voltage electric network, this topological structure is higher to the coherence request of energy-storage battery.
In order to solve the battery applications of different voltages grade in the problems in same energy storage device, present invention employs single-phase
Chain topology, and propose corresponding control strategy.
Summary of the invention
In order to solve the problems, such as described in background technique, the present invention provides a kind of single-phase chain type power electronics energy accumulation current converter
Control method, it is therefore an objective to provide a kind of energy-storage battery suitable for different voltages grade, different residual capacity it is unit cascaded after
Energy accumulation current converter control method improves the utilization rate of energy-storage battery, selects the battery of energy storage device more flexible, while making low
Piezoelectric battery access medium voltage network use is possibly realized.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of control method of single-phase chain type power electronics energy accumulation current converter, is divided into four for the control of entire energy accumulation current converter
A link: energy-storage battery SOC control ring, energy-storage units cascade inverter current control ring, network voltage locking phase and energy-storage units SOC
Balance control.
One, energy-storage battery SOC control ring includes the following steps:
Step 101, the SOC value that all basic battery modules are calculated by the administrative unit BMS of each energy-storage battery, then
Find out the average value SOC of all battery modulesfbk_Avg, maximum value SOCfbk_MaxWith minimum value SOCfbk_Min, and it is sent into battery status
Judgment module；
Step 102, in battery status judgment module, battery status is divided into 4 kinds altogether:
SOC controls illegal state, priority 1；
·SOCfbk_Max<SOCchg_Min, SOC value is too low, low battery state, priority 2；
·SOCfbk_Min>SOCchg_Max, SOC value is excessively high, high state of charge, priority 3；
·SOCfbk_Max-SOCfbk_Min>SOCchg_Err, SOC value is normal, internal balance state, priority 4；
SOCchg_Min、SOCchg_Max、SOCchg_ErrRespectively controlling value minimum value, maximum value and the deviation of SOC value；
/ enable signal is forbidden in the SOC control that step 103, battery status judgment module are sent according to higher level's control, comprehensive each
The SOC state of a battery unit, the amplitude for calculating watt current give Ipref, reactive current amplitude give Iqref, it is sent to
Inverter current control section.
Two, energy-storage units cascade inverter current control ring includes the following:
Step 201, inverter current control section receive the output I of energy-storage battery SOC control ringprefAnd Iqref, receive simultaneously
Higher level controls the watt current given value I sentpref_s, reactive current given value Iqref_s, IprefAnd IqrefRespectively with Ipref_s、
Iqref_sIt is active multiplied by active phase Cos θ after addition, then respectively multiplied by the phase of network voltage locking phase PLL part output, it is idle
Multiplied by idle phase Sin θ, the instantaneous given value I of watt current is obtainedpref1With the instantaneous given value I of reactive currentqref1, the two
As the instantaneous given value I of total current after additionref；
Step 202, the instantaneous given value I with total currentrefClosed-loop control is carried out to ac-side current, using can be to exchange
The value of the quasi- PR controller of current control, part output balances control unit as total inverter voltage output valve energy-storage battery SOC
Point.
Three, the part network voltage locking phase PLL calculates active/idle phase the Cos θ and Sin of network voltage using SOGI
θ, output to inverter current control section.
Four, in energy-storage units SOC balance control section, according to the SOC value of feedback SOC of each battery unitfbk_u1..un
With the SOC average value SOC of all battery unitsfbk_AvgDifference, use ratio adjustment module Kp, carry out between battery unit
Electricity control；After the module passes through the total inverter voltage of distributor, the road N modulating wave U is exporteds1..sn, give each energy storage inverter list
Member modulation uses.
Compared with prior art, the beneficial effects of the present invention are:
The present invention provide a kind of energy-storage battery suitable for different voltages grade, different residual capacity it is unit cascaded after storage
Energy converter control method, improves the utilization rate of energy-storage battery, selects the battery of energy storage device more flexible, while making low pressure
Battery access medium voltage network use is possibly realized.
Detailed description of the invention
Fig. 1 is the topology diagram of single-phase chain type power electronics energy accumulation current converter；
Fig. 2 is single-phase system for chain type energy storage control block diagram；
Stable state vectogram when Fig. 3 is device charged state；
Stable state vectogram when Fig. 4 is device discharge condition；
Fig. 5 is electric quantity balancing vectogram inside device energy-storage units.
Specific embodiment
Specific embodiment provided by the invention is described in detail below in conjunction with attached drawing.
The topology diagram of single-phase chain type power electronics energy accumulation current converter is as shown in Figure 1, system is topological using the more level of H bridge
Structure, since inverter side is connected, therefore the control freedom degree of electric current is 1, i.e., only total ac converter electric current can control.Chain type
The energy accumulation current converter of topology can realize the battery cascade of different voltages grade under the premise of the total inverter voltage of device is constant.
According to the residual capacity of each energy-storage battery unit, charge and discharge control is carried out, is the most important condition for realizing control strategy of the present invention.
As shown in Fig. 2, a kind of control method of single-phase chain type power electronics energy accumulation current converter, by entire energy accumulation current converter
Control be divided into four processes: energy-storage battery SOC control ring, energy-storage units cascade inverter current control ring, network voltage locking phase and
Energy-storage units SOC balance control.
One, energy-storage battery SOC control ring is the controlling unit of all battery SOCs of entire energy storage device, is included the following steps:
Step 101, the SOC value that all basic battery modules are calculated by the administrative unit BMS of each energy-storage battery, then
Find out the average value SOC of all battery modulesfbk_Avg, maximum value SOCfbk_MaxWith minimum value SOCfbk_Min, and it is sent into battery status
Judgment module；
Step 102, in battery status judgment module, battery status is divided into 4 kinds altogether:
SOC controls illegal state, priority 1；
·SOCfbk_Max<SOCchg_Min, SOC value is too low, low battery state, priority 2；
·SOCfbk_Min>SOCchg_Max, SOC value is excessively high, high state of charge, priority 3；
SOCfbk_Max-SOCfbk_Min>SOCchg_Err, SOC value is normal, internal balance state, priority 4；
The variable of this part is explained as follows in Fig. 2:
SOCfbk_u1..un: the residual power percentage of energy-storage battery unit from 1# to n#；
SOCfbk_Min: the minimum value of all energy-storage battery cell S OC values；
SOCfbk_Max: the maximum value of all energy-storage battery cell S OC values；
SOCfbk_Avg: the average value of all energy-storage battery cell S OC values；
SOCchg_Min、SOCchg_Max、SOCchg_ErrRespectively controlling value minimum value, maximum value and the deviation of SOC value.
/ enable signal is forbidden in the SOC control that step 103, battery status judgment module are sent according to higher level's control, comprehensive each
The SOC state of a battery unit, the amplitude for calculating watt current give Ipref, reactive current amplitude give Iqref, it is sent to
Inverter current control section；
The Partial Variable meaning is as follows in Fig. 2:
Ipref: the watt current of energy-storage battery cell S OC control gives amplitude；
Iqref: the reactive current of energy-storage battery cell S OC control gives amplitude；
Battery SOC control is enabled: the battery SOC control enable signal that higher level's control issues；
Two, energy-storage units cascade inverter current control ring includes the following:
Step 201, inverter current control section receive the output I of energy-storage battery SOC control ringprefAnd Iqref, receive simultaneously
Higher level controls the watt current given value I sentpref_s, reactive current given value Iqref_s, IprefAnd IqrefRespectively with Ipref_s、
Iqref_sIt is active multiplied by active phase Cos θ after addition, then respectively multiplied by the phase of network voltage locking phase PLL part output, it is idle
Multiplied by idle phase Sin θ, the instantaneous given value I of watt current is obtainedprefWith the instantaneous given value I of reactive currentqref, the two phase
As the instantaneous given value I of total current after addingref；
Step 202, the instantaneous given value I with total currentrefClosed-loop control is carried out to ac-side current, using can be to exchange
The value of the quasi- PR controller of current control, part output balances control unit as total inverter voltage output valve energy-storage battery SOC
Point.
The quasi- PR adjuster transmission function that the part uses is as follows:
Quasi- PR adjuster transmission function:(quasi- PR adjuster transmission function is the prior art,
Variable therein is known content, is not explained herein).
Inverter current control section variable meaning is as follows in Fig. 2:
Ipref_s: the watt current of higher level's control unit output gives amplitude；
Iqref_s: the reactive current of higher level's control unit output gives amplitude；
Cos θ: the active phase of network voltage；
Sin θ: the idle phase of network voltage；
Iref: the given value (instantaneous value) of total ac-side current；
Is: the actual feedback (instantaneous value) of total ac-side current；
Irated: (alternating-current magnitude is used for I to the rated value of total ac-side currentsPer unit value processing)；
Ug: the actual feedback (instantaneous value) of exchange side voltage；
Urated: (alternating-current magnitude is used for U to the rated value of exchange side voltagegPer unit value processing)；
UO: energy accumulation current converter inverter side total voltage modulating wave given value.
Three, the part network voltage locking phase PLL calculates network voltage U using SOGIgActive/idle phase Cos θ and
Sin θ, output to inverter current control section.
The transmission function of SOGI is as follows:
The transmission function of SOGI (Second Order Generalized Integrator):(SOGI transmission function is the prior art,
Variable therein is known content, is not explained herein).
Four, in energy-storage units SOC balance control section, according to the SOC value of feedback SOC of each battery unitfbk_u1..un
With the SOC average value SOC of all battery unitsfbk_AvgDifference, use ratio adjustment module Kp, proportion adjustment module output valve
Multiplied by the given value I of total ac-side currentrefPhase Cos Φ after, carry out battery unit between electricity control；The module is logical
After crossing the total inverter voltage of distributor, the road N modulating wave U is exporteds1..sn, used to each energy storage inverter cells modulate.
The variable meaning that the part uses in Fig. 2 is as follows:
Kp: the proportional control factor of energy-storage battery SOC balance control section；
Cos Φ: the phase of total inverter current given value；
Us1..sn: the modulating wave given value of energy storage inverter from 1# to n#.
Control method principle of the invention is described as follows:
Energy accumulation current converter operating condition judgment module is the kernel control module of this control strategy.According to each energy-storage battery unit
The working condition of energy accumulation current converter can be divided into following three kinds by the distribution situation of remaining capacity:
1, energy-storage battery charged state (low battery state)；
2, energy-storage battery discharge condition (high state of charge)；
3, electric quantity balancing state inside energy-storage battery.
1) device charged state
In this state, the energy-storage battery unit of whole device is completely in low battery state, needs to obtain from power grid active
For supplementing the electricity of battery.This state enters when power grid does not need energy accumulation current converter work as far as possible.
At this point, device, which is in power grid, absorbs active state, unit inverter voltage vectogram is as shown in Figure 3.Each unit
The direction of inverter voltage vector is consistent with inverter voltage direction total after cascade, and total inverter voltage phase lags behind network voltage,
By adjusting each unit inverter voltage amplitude, the power output of each unit can be distributed.If should be noted that individual unit
Inverter voltage fan-out capability it is inadequate, then each unit must all in charged state, i.e., cannot for individual unit discharge.
2) device discharge condition
In this state, the energy-storage battery of whole device is in high state of charge, at this time since energy-storage battery storing electricity is filled
It is abundant, corresponding active output can be carried out according to the working condition of power grid.Device inverter voltage vectogram as shown in figure 4,
At this point, device, which is in power grid, issues active state, total inverter voltage behind the direction of each unit inverter voltage vector and cascade
Direction is consistent, and total inverter voltage phase is ahead of network voltage, by adjusting each unit inverter voltage amplitude, can distribute
The power output of each unit.
3) internal electric quantity balancing state
When the unit of whole device serious electricity distribution inequality, that is, nearly half element cell occurs in full electricity
Amount, remaining is in deep discharge conditions, and such case can seriously affect the fan-out capability of device.
If a, there is such operating condition before device starts, charging behaviour can be carried out to low battery battery by external power supply
Make, after battery capacity is full of, then accesses power grid and work.This solution safety with higher, but need to match
Standby additional charge power supply, and it is time-consuming serious, economic benefit is low.
If voltage output ability is enough after b, energy-storage battery is unit cascaded, charging behaviour can be carried out to low battery battery
Make.At this point, the energy-storage units of Full Charge Capacity can access battery, charge to the battery of low battery.
Control strategy of the invention passes through the energy-storage battery list of high electricity using the 2nd kind of internal electric quantity balancing control method
Member charges to the energy-storage battery unit of low battery.Single unit system does not have active exchange to power grid, but due to needing a certain amount of nothing
Function electric current carries out power-balance, therefore there are reactive power exchanges.N grades of cascade inverters at this time, it is active when there is m unit to consume
When, this part is active to be provided by remaining n-m unit, and whole device is externally without active exchange, and inverter voltage vectogram is such as
Shown in Fig. 5.
Control strategy of the invention uses the closed-loop control of energy-storage battery total surplus electricity, obtains the active electricity of device entirety
Flow amplitude；Using the PLL of broad sense second-order integrator (SOGI integrator) composition grid side voltage；It is carried out using quasi- PR adjuster
The zero steady state error control of alternating current；The electric quantity balancing control between energy-storage module is carried out using proportional controller.
Above embodiments are implemented under the premise of the technical scheme of the present invention, give detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to the above embodiments.Method therefor is such as without spy in above-described embodiment
Not mentionleting alone bright is conventional method.
Claims (3)
1. a kind of control method of single-phase chain type power electronics energy accumulation current converter, which is characterized in that by entire energy accumulation current converter
Control be divided into four processes: energy-storage battery SOC control ring, energy-storage units cascade inverter current control ring, network voltage locking phase and
Energy-storage units SOC balance control；
Energy-storage battery SOC control ring includes the following steps:
Step 101, the SOC value that all basic battery modules are calculated by the administrative unit BMS of each energy-storage battery, then find out
The average value SOC of all battery modulesfbk_Avg, maximum value SOCfbk_MaxWith minimum value SOCfbk_Min, and it is sent into battery status judgement
Module；
Step 102, in battery status judgment module, battery status is divided into 4 kinds altogether:
SOC controls illegal state, priority 1；
·SOCfbk_Max<SOCchg_Min, SOC value is too low, low battery state, priority 2；
·SOCfbk_Min>SOCchg_Max, SOC value is excessively high, high state of charge, priority 3；
·SOCfbk_Max-SOCfbk_Min>SOCchg_Err, SOC value is normal, internal balance state, priority 4；
SOCchg_Min、SOCchg_Max、SOCchg_ErrRespectively controlling value minimum value, maximum value and the deviation of SOC value；
/ enable signal, comprehensive each electricity are forbidden in the SOC control that step 103, battery status judgment module are sent according to higher level's control
The SOC state of pool unit, the amplitude for calculating watt current give Ipref, reactive current amplitude give Iqref, it is sent to inversion
Current control part；
The energy-storage units cascade inverter current control ring
Step 201, inverter current control section receive the output I of energy-storage battery SOC control ringprefAnd Iqref, while receiving higher level
Control the watt current given value I sentpref_s, reactive current given value Iqref_s, IprefAnd IqrefRespectively with Ipref_s、Iqref_s
It is active multiplied by active phase Cos θ after addition, then respectively multiplied by the phase of the part network voltage locking phase PLL output, it is idle multiplied by
Idle phase Sin θ obtains the instantaneous given value I of watt currentpref1With the instantaneous given value I of reactive currentqref1, the two addition
Afterwards as the instantaneous given value I of total currentref；
Step 202, the instantaneous given value I with total currentrefClosed-loop control is carried out to ac-side current, using can be to alternating current
The value of the quasi- PR controller of control, part output balances control section as total inverter voltage output valve energy-storage battery SOC.
2. a kind of control method of single-phase chain type power electronics energy accumulation current converter according to claim 1, which is characterized in that
The part network voltage locking phase PLL calculates active/idle phase Cos θ and the Sin θ of network voltage, output to inversion using SOGI
Current control part.
3. a kind of control method of single-phase chain type power electronics energy accumulation current converter according to claim 1, which is characterized in that
In energy-storage units SOC balance control section, according to the SOC value of feedback SOC of each battery unitfbk_u1..unWith all battery lists
The SOC average value SOC of memberfbk_AvgDifference, use ratio adjustment module Kp, carry out the electricity control between battery unit；The mould
After block passes through the total inverter voltage of distributor, the road N modulating wave U is exporteds1..sn, used to each energy storage inverter cells modulate.
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| CN109995066B (en) | 2021-01-08 |
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