CN105281401A - Novel storage battery charging and discharging system - Google Patents
Novel storage battery charging and discharging system Download PDFInfo
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- CN105281401A CN105281401A CN201510651450.1A CN201510651450A CN105281401A CN 105281401 A CN105281401 A CN 105281401A CN 201510651450 A CN201510651450 A CN 201510651450A CN 105281401 A CN105281401 A CN 105281401A
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Abstract
The invention discloses a novel storage battery charging and discharging system which has bidirectional power flow and can satisfy various storage battery charging and discharging requirements. The system comprises a three-winding transformer, a six-pulse rectifier, a PWM rectifier, a DC bus, and a DC/DC chopper. A primary side of the transformer is in angular wiring and is connected with power grid voltage. Secondary sides are in angular wiring and star wiring, and are connected with input terminals of the PWM rectifier and the six-pulse rectifier respectively. Positive electrodes of the output terminals of the two rectifiers are connected in parallel and connected with a positive electrode of the DC bus, and negative electrodes of the output terminals of the two rectifiers are connected in parallel and connected with a negative electrode of the DC bus. The positive electrode of an input terminal of the DC/DC chopper is connected with the positive electrode of the DC bus, the negative electrode of the input terminal is connected with the negative electrode of the DC bus, the positive electrode of an output terminal is connected with the positive electrode of a battery, and the negative electrode of the output terminal is connected with the negative electrode of the battery.
Description
Technical field:
The present invention relates to a kind of novel storage battery formation charging/discharging system.
Background technology:
Storage battery, as a kind of energy storage device of portable, reliable power supply, is obtained for extensive use in the every field such as generation of electricity by new energy and electric automobile.Storage battery formation processing is the important step of cell production process, and changes into the key equipment that power supply is formation process.Storage battery producer early application change into supply unit many employings manual operation, can not realize accurate control, simultaneously the discharge process of storage battery is many is completed by ohmic load, causes very large energy waste.
At present, change into power technology and can be divided into controllable silicon phase shifting control discharge and recharge technology and high frequency switch power technology, the two all achieves the function of battery discharge energy feedback grid, but when the former works, power factor is lower, and harmonic wave is large, pollutes electrical network; The latter can significantly reduce harmonic pollution and raise the efficiency.Change into power supply for HF switch, AC/DC conversion and DC/DC generally can be divided into convert two parts, and two parts are connected by DC bus.Consult paper and patent documentation, retrieve two kinds of implementations that HF switch changes into power supply AC/DC part: a kind of mode is the two-way flow realizing power between DC bus and electrical network by controlling PWM rectifier, as patent CN201310703795, namely when charging, PWM rectifier is operated in rectification state, and during electric discharge, PWM rectifier is operated in inverter mode; Another kind of mode by charging and discharging module separately, charged to storage battery by 12 arteries and veins rectifiers, discharge by PWM rectifier, and control strategy is relatively simple, but is the increase in the quantity of Industrial Frequency Transformer, and volume is large, as patent CN201410670451.Comprehensively the AC/DC part of above-mentioned two patents proposes a kind of novel battery charge and discharge device of the present invention.
Summary of the invention:
Technical problem to be solved by this invention is: the invention discloses a kind of to and fro flow of power, can meet a kind of novel storage battery formation charging/discharging system of the various charge-discharge power demand of storage battery.
The technical solution used in the present invention is, designed battery charge and discharge device comprises three-winding transformer, 6 arteries and veins rectifiers, PWM rectifier, DC bus, DC/DC chopper.The former limit of three-winding transformer is angle scheme, be connected with line voltage, secondary is angle scheme and star-star connection, be connected to the ac input end of PWM rectifier and 6 arteries and veins rectifiers respectively, be connected with DC bus positive pole after the positive pole parallel connection of two rectifier output ends, be connected with DC bus negative pole after the parallel connection of two rectifier output end negative poles, DC/DC chopper input anode is connected with DC bus positive pole, input cathode is connected with DC bus negative pole, output head anode is connected with anode, and negative pole of output end is connected with battery terminal negative.
Described PWM rectifier comprises pwm power module and PWM control module two parts.Described pwm power module is made up of six IGBT.Described PWM control module judges PWM rectifier operating state by the DC side sense of current by flowing through in collection PWM rectifier and DC bus-bar voltage size as criterion, make described PWM rectifier be operated in uncontrollable rectifier state when battery charges, form 12 arteries and veins rectifiers with 6 arteries and veins rectifiers and battery is charged; Unity power factor inverter mode is operated in, to realize the to and fro flow of power between electrical network and DC bus when battery charges.
Described DC/DC chopper comprises DC/DC power model and DC/DC control module, and described DC/DC power model is buck-boost circuit, is made up of two IGBT; Described DC/DC control module difference according to the actual requirements, realize for several accumulator cell charging and discharging modes such as the charging of storage battery constant voltage, constant current charge-discharge and pulse current charges, to realize the to and fro flow of power between DC bus and storage battery by gathering accumulator voltage and charging and discharging currents and temperature as criterion.
The invention has the beneficial effects as follows: the two-way flow being achieved energy between electrical network and storage battery in battery charge and discharge process in the present invention by PWM rectifier, DC bus and DC/DC chopper three part, avoid the mass energy waste caused by conductive discharge; Do not need during charging to control PWM rectifier, simplify control strategy; In battery discharging process, realized the inversion work of unity power factor by PWM rectifier, the harmonic pollution caused for electrical network is little, meanwhile, only uses a three-winding transformer, reduces device and take volume.
Accompanying drawing illustrates:
Figure 1 show a kind of topological diagram of novel storage battery formation charging/discharging system
Figure 2 illustrate PWM rectifier control strategy flow chart
Figure 3 show DC/DC chopper control strategy flow chart
Embodiment:
Below in conjunction with accompanying drawing, describe the specific embodiments of novel storage battery charge and discharge device of the present invention in detail:
As shown in Figure 1, novel storage battery charge and discharge device of the present invention, its structure comprises: the three-winding transformer T that former limit is connected with line voltage, the primary coil of transformer T is delta connection, two secondary coil no-load voltage ratios are identical, be respectively delta connection and star-star connection, wherein the secondary of delta connection is connected with the ac input end of PWM rectifier Z1, and the secondary of star-star connection is connected with the ac input end of 6 arteries and veins rectifier Z2.PWM rectifier Z1 is connected with the positive pole of DC bus with after the DC side output head anode parallel connection of 6 arteries and veins rectifier Z2, is connected after negative pole parallel connection with the negative pole of DC bus; On DC bus can and connect multiple DC/DC chopper, the input anode of DC/DC chopper D1 to Dn is connected with DC bus positive pole, and input cathode is connected with DC bus negative pole, and output is connected to accumulator anode and cathode.
Wherein, PWM rectifier is made up of pwm power module and PWM control module.Pwm power module uses three-phase full-bridge controlled rectifier, and full control device uses IGBT; PWM control module gathers DC bus-bar voltage Udc and PWM rectifier DC side electric current I pwm, and adopt classical SPWM Double-loop Control Strategy, control flow as shown in Figure 2.When system starts, acquiescence battery condition is charged state, and PWM rectifier Z1 is in stopped status, i.e. uncontrollable rectifier state, and 6 arteries and veins rectifier Z2 form 12 arteries and veins rectifier work jointly, effectively can eliminate 5 subharmonic and 7 subharmonic.When Udc is greater than the limit value Udc0 of setting, now by control module, PWM rectifier Z1 is switched to and determine voltage inverter mode, 6 arteries and veins rectifier Z2 do not work, and make whole system be operated in battery discharge status, and DC bus-bar voltage is stabilized in set point Udc1, set point Udc1 is slightly less than Udc0; When detecting Ipwm and being forward flow (regulation flows in FIG from left to right for forward) and being greater than setting limit value Ipwm0, PWM rectifier Z1 is made to switch to uncontrollable rectifier state by control module, PWM rectifier Z1 and 6 arteries and veins rectifier Z2 forms 12 arteries and veins rectifiers jointly, and whole system is operated in battery charging state.So far, complete the handoff procedure of a recharge-discharge-charging between grid side and DC bus, achieve the two-way flow function of power.
Wherein, DC/DC chopper is made up of DC/DC power model and DC/DC control module two parts.DC/DC power model adopts the buck-boost circuit on basis, and electronic power switch wherein uses full control device IGBT; On DC bus can and meet multiple DC/DC chopper D1 to Dn, below only for D1, control strategy is described, DC/DC control module gathers electric current I _ b1 and the terminal voltage U_b1 of storage battery 1, according to not in the same time for the charge-discharge power demand of storage battery, receive the status command that host computer issues and switch.Make D1 be operated in buck circuit-mode by triggering turning on and off of IGBT-S1, and under buck pattern, realize constant-current charge, the constant-voltage charge pattern of storage battery; Make D1 be operated in boost circuit-mode by triggering turning on and off of IGBT-S2, and realize storage battery constant-current discharge under boost pattern; By triggering alternately turning on and off of IGBT-S1, S2, being that the buck/boost pattern of D1 switches the pulse current charge realizing storage battery fast, achieving the two-way flow of power between storage battery side and DC bus.
The course of work of whole battery charging plant is described for the discharge and recharge of storage battery 1-n below.N saves storage battery and is in different charging and discharging states separately, and each DC/DC chopper works in different patterns according to the different instruction of host computer.The impossible complete equipilibrium of electric energy that the electric energy that in multiple storage battery, the storage battery of discharge condition is released and the storage battery of charged state need, when the electric energy that n joint storage battery shows as releasing is more, DC bus-bar voltage Udc pump liter will certainly be caused, when voltage pump rise is to limit value Udc0, according to PWM control flow shown in accompanying drawing 2 PWM rectifier is switched to and determine DC bus-bar voltage inversion operating state; When the rechargeable electrical energy that n joint storage battery shows as needs is more, detects Ipwm and flow to as forward, and be greater than setting limit value Ipwm0, according to PWM control flow shown in accompanying drawing 2, PWM rectifier is switched to stopped status, namely work in uncontrollable rectifier state.So far, the to and fro flow of power of whole charge and discharge device inside is realized.
Above execution mode is only for illustration of the present invention, but not limitation of the present invention.Although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, various combination, amendment or equivalent replacement are carried out to technical scheme of the present invention, do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (3)
1. a novel storage battery formation charging/discharging system, is characterized in that, comprises three-winding transformer, 6 arteries and veins rectifiers, PWM rectifier, DC bus, DC/DC chopper; The former limit of three-winding transformer is angle scheme, be connected with line voltage, secondary is angle scheme and star-star connection, connect the input of PWM rectifier and 6 arteries and veins rectifiers respectively, be connected with the positive pole of DC bus after the positive pole parallel connection of two rectifier output ends, be connected with the negative pole of DC bus after the parallel connection of two rectifier output end negative poles, the positive pole of DC/DC chopper input is connected with DC bus positive pole, input cathode is connected with DC bus negative pole, the positive pole of output is connected with anode, and negative pole of output end is connected with battery terminal negative.
2. a kind of novel storage battery formation charging/discharging system according to claim 1, is characterized in that, PWM rectifier wherein comprises pwm power module and PWM control module two parts, and described pwm power module is made up of six IGBT; Described PWM control module changes PWM rectifier operating state by the DC side sense of current by flowing through in collection PWM rectifier and DC bus-bar voltage size as criterion, described PWM rectifier is made to be operated in uncontrollable rectifier state when battery charges, unity power factor inverter mode is operated in, to realize the to and fro flow of power between electrical network and DC bus when battery charges.
3. novel storage battery formation charging/discharging system according to claim 1, is characterized in that, DC/DC chopper wherein comprises DC/DC power model and DC/DC control module, and described DC/DC power model is buck-boost circuit, is made up of two IGBT; Described DC/DC control module difference according to the actual requirements, realize for several accumulator cell charging and discharging modes such as the charging of storage battery constant voltage, constant current charge-discharge and pulse current charges, to realize the to and fro flow of power between DC bus and storage battery by collection accumulator voltage and charging and discharging currents as criterion.
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| CN201510651450.1A CN105281401A (en) | 2015-10-10 | 2015-10-10 | Novel storage battery charging and discharging system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811504A (en) * | 2016-03-30 | 2016-07-27 | 安徽工程大学 | Bidirectional DC/DC converter used for lithium battery formation |
| CN107317377A (en) * | 2017-08-16 | 2017-11-03 | 深圳市菊水皇家科技有限公司 | A kind of two-way AC DC circuits of Battery formation partial volume and its control method |
| CN111628647A (en) * | 2020-05-22 | 2020-09-04 | 广东维可特科技有限公司 | Bidirectional DC/DC converter |
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| CN104158273A (en) * | 2014-08-07 | 2014-11-19 | 东莞市冠佳电子设备有限公司 | Battery forming and capacity grading system |
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2015
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| KR20090115360A (en) * | 2008-05-02 | 2009-11-05 | 하연태 | Charging And Discharging System For Battery |
| CN102437628A (en) * | 2011-10-22 | 2012-05-02 | 华北电力大学（保定） | Storage battery reduction charge-discharge converter circuit |
| CN102684514A (en) * | 2012-03-13 | 2012-09-19 | 北京千驷驭电气有限公司 | Energy feedback type traction power supply device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105811504A (en) * | 2016-03-30 | 2016-07-27 | 安徽工程大学 | Bidirectional DC/DC converter used for lithium battery formation |
| CN107317377A (en) * | 2017-08-16 | 2017-11-03 | 深圳市菊水皇家科技有限公司 | A kind of two-way AC DC circuits of Battery formation partial volume and its control method |
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| CN111628647A (en) * | 2020-05-22 | 2020-09-04 | 广东维可特科技有限公司 | Bidirectional DC/DC converter |
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Application publication date: 20160127 |