CN102364804A - Independent electrical energy storage system - Google Patents
Independent electrical energy storage system Download PDFInfo
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- CN102364804A CN102364804A CN2011103585545A CN201110358554A CN102364804A CN 102364804 A CN102364804 A CN 102364804A CN 2011103585545 A CN2011103585545 A CN 2011103585545A CN 201110358554 A CN201110358554 A CN 201110358554A CN 102364804 A CN102364804 A CN 102364804A
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Abstract
The invention discloses an independent electrical energy storage system. The system comprises: a storage battery, a bidirectional converter UC, a transformer T and a distribution switch K. The transformer T is connected on a phase line L of an alternating current power grid through the distribution switch K. the storage battery CG is connected with the transformer T through the bidirectional converter UC. The bidirectional converter UC comprises: an inductance coil Lr, an inductance coil Ls, an inductance coil Lt, a half-bridge converter circuit, a capacitor C and a variable resistor Rd. By using the independent electrical energy storage system of the invention, a purpose of adjusting balance of grid peak and valley can be realized and stability of the electrical power system can be improved. The independent electrical energy storage system has many other advantages.
Description
Technical field
The present invention relates to a kind of free-standing electric energy storage system.
Background technology
There is the phenomenon of network load peak and low ebb in network system in power supply process.Power load is a constantly amount of change, and as far as an area, the characteristic of load variations depends primarily on factors such as electricity consumption industrial structure, region, seasonal variations, economic development and living standard.Power load lack of uniformity in time makes that a certain period electricity consumption is more, and a certain period electricity consumption is less, and this has just formed peak of power consumption load and low ebb load.Peak-valley difference is bigger, and operation of power networks is more uneconomical.Can find out typical case's daily load curve from somewhere electrical network winter, summer; The electricity consumption daily load generally has early, middle and late three peaks; Wherein late peak is because illumination and resident living power utility are formed by stacking, and the minimizing of commerce, household electricity and the electricity consumption in the late into the night of single shift system production plant has formed low ebb.
The continuation of supply of electric power is the basic assurance of satisfying people's happy life.At present, because the power supply capacity of various places power supply unit is limited, and adds that power load is divided into high crest segment and low ebb section, make various places period short of electricity phenomenon occur.Especially in annual two seasons of summer in winter, the increase of power load causes the supply of electric power wretched insufficiency.Power supply department has only the power cuts to limit consumption of employing control electricity consumption, but this has brought adverse influence obviously for people's lives and commercial production.
The peak-valley difference of this power load has caused tremendous influence to electrical network, can cause voltage instability, loss to strengthen.Peak and valley power consumption are seriously uneven, have both had electricity shortage, also have the not enough problem of power consumption.In the prior art; The administration of power networks planning department usually adopts the mode of building accumulation of energy reservoir and storage station to regulate; But this mode have investment huge, take that the large stretch of water surface is ploughed and shortcoming such as the construction period is long, particularly can't realize in densely populated big and medium-sized cities.
Summary of the invention
The present invention is the weak point that exists in the above-mentioned prior art for avoiding, and a kind of free-standing electric energy storage system is provided, to realize regulating the purpose of electrical network peak valley balance.
The present invention adopts following technical scheme for the technical solution problem.
The stand alone type electric energy storage system, its design feature is to comprise storage battery, two way convertor UC, transformer T, panel switches K; Said transformer T is connected on through panel switches K on the phase line L of AC network, and said storage battery CG is connected with said transformer T through two way convertor UC.
The design feature of free-standing electric energy storage system of the present invention also is:
Said two way convertor UC comprises inductance coil Lr, inductance coil Ls, inductance coil Lt, half-bridge inversion circuit, capacitor C and variable resistor Rd; The three-phase of three-phase alternating current input eR, eS and eT are connected between the upper and lower bridge arm through inductance coil Lr, inductance coil Ls, inductance coil Lt and half-bridge inversion circuit respectively, and capacitor C and variable resistor Rd all are in parallel with half-bridge inversion circuit.
Compared with present technology, beneficial effect of the present invention is embodied in:
Adopt intelligent two way convertor UC, realize that two-way unsteady flow controls the balance of regulating network system, when user power utilization amount section at a low ebb, accumulators charges, storage power, and this moment, electricity price was a lowest price; When the user power utilization amount was in the peak section, the electric weight of battery stores discharged, and this moment, electricity price was a highest price.Free-standing electric energy storage system of the present invention, reliable, easy to maintenance, pollutant emission is low, be beneficial to environmental protection, has practiced thrift electric cost, has improved stability of power system.
Description of drawings
Fig. 1 is the structural representation of free-standing electric energy storage system of the present invention.
Fig. 2 is the main circuit topology figure of the two way convertor UC of free-standing electric energy storage system of the present invention.
Fig. 3 is a two way convertor UC control procedure isoboles.
Fig. 4 is operated in along the phasor diagram under the change state for two way convertor UC.
Fig. 5 is operated in the phasor diagram under the inverter mode for two way convertor UC.
Below pass through embodiment, and combine accompanying drawing that the present invention is described further.
Embodiment
Referring to Fig. 1 and Fig. 2, free-standing electric energy storage system comprises storage battery, two way convertor UC, transformer T, panel switches K; Said transformer T is connected on through panel switches K on the phase line L of AC network, and said storage battery CG is connected with said transformer T through two way convertor UC.
Two way convertor UC is used as rectification charger when the electrical network normal power supply, convert grid alternating current into direct current to the charge in batteries energy storage; When grid cut-off or abnormal electrical power supply, two way convertor UC is used as inverter, and battery stores electricity energy is changed the output to transformer T to distribution of output AC electricity, to user's use or generate electricity by way of merging two or more grid systems.Realize the conversion of charging and power supply through two way convertor UC, can be when the power supply low ebb by utility grid to charge in batteries, power storage is got up; And when the power supply peak, storage battery institute electric energy stored is discharged; And convert alternating current into through two way convertor UC, and remedying the deficiency of electrical network electric weight, thus the electric weight of allotment electrical network peak and low ebb; Realize regulating the purpose of electrical network peak valley balance, improved stability of power system.
Said two way convertor UC comprises inductance coil Lr, inductance coil Ls, inductance coil Lt, half-bridge inversion circuit, capacitor C and variable resistor Rd; The three-phase of three-phase alternating current input eR, eS and eT are connected between the upper and lower bridge arm through inductance coil Lr, inductance coil Ls, inductance coil Lt and half-bridge inversion circuit respectively, and capacitor C and variable resistor Rd all are in parallel with half-bridge inversion circuit.
As shown in Figure 1, two way convertor UC is used as rectification charger when the electrical network normal power supply, converts grid alternating current into direct current to the charge in batteries energy storage; When grid cut-off or abnormal electrical power supply, two way convertor UC is used as inverter, and battery stores electricity energy is changed the output to transformer T to distribution of output AC electricity, to user's use or generate electricity by way of merging two or more grid systems.
Two way convertor UC mainly is made up of constant current charge-discharge and unsteady flow two large divisions, and the constant current charge/discharge is partly controlled the charging and discharging currents of battery and realized constant current charge-discharge; Unsteady flow part when discharge as the variable load of battery discharging; And, change the size of load simultaneously according to the size of discharging current discharge energy inversion feedback grid, and when charging; The sinusoidal ac of electrical network is through SPWM (Sinusoidal PWM; Sinusoidal pulse width modulation) behind the rectifying and wave-filtering, to charge in batteries, the duty ratio of controlling according to charging current size adjustment SPWM simultaneously.
The controlled target of system is to make system's ability way traffic, and the charge and discharge process of storage battery can be carried out by curve according to the rules.System is in the rectification pattern when charging, the grid side electric current is that sine wave and power factor are 1, and electric energy flows to storage battery from electrical network; System is in inverter mode when discharge, the grid side electric current is that sine wave and power factor are " 1 ", and this moment, electric energy flowed to electrical network from storage battery.
Fig. 2 is the main circuit topology figure of two way convertor UC
Concrete operation principle conversion process as shown in the figure is following:
Charging process is equivalent to three-phase controlled rectifier circuit, and the one-period of power tube control is divided into 6 sections, and every section is 60 degree, and the power tube of conducting and output commutating voltage situation are following in each section: I:V1, V6 conducting, rectifier output voltage are U
R ' S '=U
R '-U
S 'II:V1, V2 conducting, rectifier output voltage are U
R ' T '=U
R '-U
T 'III:V3, V2 conducting, rectifier output voltage are U
S ' T '=U
S '-U
T 'IV:V3, V4 conducting, rectifier output voltage are U
S ' R '=U
S '-U
R 'V:V5, V4 conducting, rectifier output voltage are U
T ' R '=U
T '-U
R 'VI:V5, V6 conducting, rectifier output voltage are U
T ' S '=U
T '-U
S 'So circulation, the output galvanic current is pressed, and is storage battery CG charging.
Discharge process is equivalent to three-phase inverter bridge circuit, and main circuit is made up of 6 IGBT and 6 diodes, and V1 and V2 are on same brachium pontis, and V3 and V4 are at same brachium pontis, and V5 and V6 are at same brachium pontis.When 1 and 4 lead to, U
R ' S '=Ud, when 3 and 2 lead to, U
R ' S '=-Ud, when 1 and 3 or 2 and 4 lead to, U
R ' S '=0.Output line voltage PWM ripple constitutes load phase voltage PWM ripples by (± 2/3) Ud by ± Ud and 0 three kinds of level, and totally 5 kinds of level of (± 1/3) Ud and 0 forms.Through the conducting of DSP power controlling pipe, obtain stable three-phase sine-wave, be connected to the grid or be the user load power supply.Like Fig. 3 is the R phase control procedure isoboles of two way convertor UC;
is accumulator internal resistance voltage among the figure, and
is equivalent to line voltage.Through changing two-way inverter output voltage
Change output current
Work as electric current
With line voltage
When direction was consistent, system was in charged state; Work as electric current
Direction and line voltage
When opposite, system is in inverter mode, R
R, R '
RBe system's equivalent internal resistance, the corresponding relation between each parameter does
Fig. 4 is operated in along the phasor diagram under the change state for two way convertor UC, user power utilization amount section at a low ebb, and two way convertor UC is a switching process, charges a battery storage power.Phasor Ur lags behind phasor Er among the figure, and the angle that falls behind is α.α is the angle of Er and Ur among the figure;
is the angle of Ir and Er; Can find out the size that changes Ur and α, can realize that power factor is 1, electric current leading current voltage; The △ OAB of Fig. 4 must be the right angle; At this moment three-phase alternating-current supply to charge in batteries, in the △ OAB that phasor Er, phasor Ur and phasor Ux constitute, has Er=Ur+Ux to set up to the rectification simultaneously of load output energy.
Fig. 5 is operated in the phasor diagram under the inverter mode for two way convertor UC, and the user power utilization amount is in the peak section, and reversible transducer UC is the inversion process, with the energy back of storage battery to electrical network.α is the angle of Er and Ur among the figure;
is the angle of Ir and Er; Can find out the size that changes Ur and α; Can realize that power factor is 1, supply voltage after the current hysteresis realizes that inverter mode is fed to electrical network with the back electric quantity of storage battery.In the △ OAH that constitutes by phasor Er, Ur and Ux, have Er=Ur+Ux to set up equally, but α is an advance angle.
Free-standing electric energy storage system of the present invention, at the power supply low-valley interval, the electrical network electric weight is rich, and voltage is higher, connects mains supply by panel switches K, to charge in batteries, rich electric weight is absorbed storage through two way convertor UC; Supplying power peak period, electrical network electric weight wretched insufficiency, voltage is on the low side; Two way convertor UC is with the electric energy of accumulators store;,,, industrial and commercial enterprises and residential building can be provided with respectively to panel switches K output electric weight through isolating transformer T at environment such as factory, enterprise, mine, office and residential buildings for providing stable electric energy; Form distributed accumulation power supply system, design Artificial Control type or Based Intelligent Control type.In the different periods of electric load, at power load low ebb section, after 9, energy-storage system is a battery state of charge approximately at night, electrical power storage is got up, and the crest voltage of absorbing redundant electric weight, regulation voltage is stable; When power load peak section, greatly about at 8 o'clock in the morning to ten two points, also have 2 o'clock to 8 o'clock afternoon, energy-storage system discharges the storage battery electric energy, adjustment electrical network stable supplies industrial and commercial enterprises and residential building use.
Through distributing vast user's bidirectional current transformer and battery system; Electrical network loaded by day discharge electric energy peak period; For the industrial and commercial enterprises that arrange energy-storage system respectively provide electric energy; Consume unnecessary electric energy at the night load low-valley interval from grid charging, disperse storage, reach the active balance of electrical network at peak and low ebb.
Compare with original storage station; This distributed multi-point and wide-ranging energy concentration effect solves electrical network equally in the peak electric quantity not sufficient, the serious unnecessary contradiction of low ebb electric weight; It is additional to realize that electrical network discharges on the peak; Low ebb absorbs the balance of storage to be carried, and is more suitable for multi-point and wide-ranging big and medium-sized cities industrial and commercial enterprises and resident family, effectively raises the quality of power supply.
Claims (2)
1. free-standing electric energy storage system is characterized in that, comprises storage battery, two way convertor UC, transformer T, panel switches K; Said transformer T is connected on through panel switches K on the phase line L of AC network, and said storage battery CG is connected with said transformer T through two way convertor UC.
2. free-standing electric energy storage system according to claim 1 is characterized in that, said two way convertor UC comprises inductance coil Lr, inductance coil Ls, inductance coil Lt, half-bridge inversion circuit, capacitor C and variable resistor Rd; The three-phase of three-phase alternating current input eR, eS and eT are connected between the upper and lower bridge arm through inductance coil Lr, inductance coil Ls, inductance coil Lt and half-bridge inversion circuit respectively, and capacitor C and variable resistor Rd all are in parallel with half-bridge inversion circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103585545A CN102364804A (en) | 2011-11-14 | 2011-11-14 | Independent electrical energy storage system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103585545A CN102364804A (en) | 2011-11-14 | 2011-11-14 | Independent electrical energy storage system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810857A (en) * | 2012-07-09 | 2012-12-05 | 华中科技大学 | Power quality regulator for series direct current power system |
| CN102832611A (en) * | 2012-08-29 | 2012-12-19 | 华中科技大学 | Parallel-form power quality conditioner for direct current power system |
| CN103280867A (en) * | 2013-05-13 | 2013-09-04 | 张慧昌 | System for charging and discharging storage battery by using common generatrix |
| CN103634977A (en) * | 2013-02-17 | 2014-03-12 | 黄涛 | Energy storage LED street lamp intelligent management system |
| CN105406585A (en) * | 2015-12-11 | 2016-03-16 | 上海查尔斯电子有限公司 | Emergency power supply for nuclear station |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001045675A (en) * | 1999-07-29 | 2001-02-16 | Kansai Electric Power Co Inc:The | Power storage system |
| CN101557115A (en) * | 2009-05-15 | 2009-10-14 | 江苏省电力公司金湖县供电公司 | Energy storing device for supplying valley current at peak of current supply |
| CN201766373U (en) * | 2010-09-13 | 2011-03-16 | 江西省电力科学研究院 | Power quality control device for distributed photovoltaic power grid |
| CN202333828U (en) * | 2011-11-14 | 2012-07-11 | 合肥联信电源有限公司 | Independent type electric energy storing system |
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2011
- 2011-11-14 CN CN2011103585545A patent/CN102364804A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001045675A (en) * | 1999-07-29 | 2001-02-16 | Kansai Electric Power Co Inc:The | Power storage system |
| CN101557115A (en) * | 2009-05-15 | 2009-10-14 | 江苏省电力公司金湖县供电公司 | Energy storing device for supplying valley current at peak of current supply |
| CN201766373U (en) * | 2010-09-13 | 2011-03-16 | 江西省电力科学研究院 | Power quality control device for distributed photovoltaic power grid |
| CN202333828U (en) * | 2011-11-14 | 2012-07-11 | 合肥联信电源有限公司 | Independent type electric energy storing system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810857A (en) * | 2012-07-09 | 2012-12-05 | 华中科技大学 | Power quality regulator for series direct current power system |
| CN102810857B (en) * | 2012-07-09 | 2014-10-29 | 华中科技大学 | Power quality regulator for series direct current power system |
| CN102832611A (en) * | 2012-08-29 | 2012-12-19 | 华中科技大学 | Parallel-form power quality conditioner for direct current power system |
| CN103634977A (en) * | 2013-02-17 | 2014-03-12 | 黄涛 | Energy storage LED street lamp intelligent management system |
| CN103634977B (en) * | 2013-02-17 | 2016-12-28 | 黄涛 | Energy storage LED street lamp intelligent management |
| CN103280867A (en) * | 2013-05-13 | 2013-09-04 | 张慧昌 | System for charging and discharging storage battery by using common generatrix |
| CN105406585A (en) * | 2015-12-11 | 2016-03-16 | 上海查尔斯电子有限公司 | Emergency power supply for nuclear station |
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Application publication date: 20120229 |