CN102231532A - Liquid flow battery energy storage paralleling apparatus and method - Google Patents
Liquid flow battery energy storage paralleling apparatus and method Download PDFInfo
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- CN102231532A CN102231532A CN201110177227XA CN201110177227A CN102231532A CN 102231532 A CN102231532 A CN 102231532A CN 201110177227X A CN201110177227X A CN 201110177227XA CN 201110177227 A CN201110177227 A CN 201110177227A CN 102231532 A CN102231532 A CN 102231532A
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Abstract
The invention discloses a liquid flow battery energy storage paralleling apparatus and method. The apparatus comprises a control module and a current converting module for AC-DC conversion and DC-AC conversion. One end of the current converting module is connected to an alternating current input terminal while the other end of the current converting module is connected to an exterior energy storing module. The control module detects the voltage of the energy storing module in real time, generates a control instruction and sends the instruction to the current converting module. The apparatus can charge and discharge deeply, plays a role of inverting independently in emergencies in a micro net and increases the effective utilization rate of novel electric energy.
Description
Technical field
The present invention relates to a kind of battery accumulation of energy grid-connecting apparatus, specifically, relate to a kind of flow battery accumulation of energy grid-connecting apparatus.
Background technology
The most of electrical network of China is generally all based on large-scale centralized formula power station at present, power to the end user by existing transmission and distribution networks, this traditional mode electric power of can providing and delivering safely and reliably, but increase along with renewable energy power generation ratio demand, the essence of electrical network is also taking place to change, therefore, the problem that is now faced is, along with the energy ratio that wind energy turbine set and photovoltaic generation factory are provided is growing, these wind energy turbine set and photovoltaic generation factory are generally all away from the population collection district, and the power supply target is mainly the city electricity consumption and commercial power is powered, therefore, can obtain electric power from various forms of power plants in order to ensure this novel power grid, at present, the subject matter that generation of electricity by new energy faced is that electricity collection is incomplete, be wasted greatly, main cause is that a lot of renewable energy resources power plant generation load is inhomogeneous, can't provide balanced energy for electrical network, be badly in need of research and development and be fit to distributed middle-size and small-size energy-storage system, come balance renewable source of energy generation amount.Wherein flow battery is comparatively desirable accumulation of energy object in the electrochemistry accumulation of energy, but this battery has advantages such as energy density height, the life-span is long, pollution-free, non-maintaining, the high conformity degree of depth discharges and recharges, and is extensively paid close attention to by accumulation of energy circle.
Based on this, how to invent a kind of grid-connecting apparatus that is used for the flow battery energy-storage system, can the degree of depth discharge and recharge, improve the utilance that is incorporated into the power networks, be the problem that the present invention mainly solves.
Summary of the invention
The present invention is directed to existing accumulation of energy grid-connecting apparatus, a kind of flow battery accumulation of energy grid-connecting apparatus is provided, can deep discharge, the reliability height.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of flow battery accumulation of energy grid-connecting apparatus, comprise control module, be used for the unsteady flow module that AC-DC changes and DC-AC changes, described unsteady flow module one end connects external communication electrical input, an other end connects outside accumulation of energy module, described control module detects the voltage of accumulation of energy module in real time, generate control command and be sent to described unsteady flow module, described accumulation of energy module is the flow battery group.
Further, described unsteady flow module comprises SCR current transformer and IGBT current transformer, the alternating current input terminal connects the accumulation of energy module by the SCR current transformer on the one hand, connect the accumulation of energy module by the IGBT current transformer on the one hand in addition, the control command that transmission is used to control conducting state described control module is compared the magnitude of voltage of accumulation of energy module with preset threshold value after is to described SCR current transformer and IGBT current transformer, and described SCR current transformer and IGBT current transformer can not the while conductings.
Described control module is a flow battery accumulation of energy net-connected controller.
Further, described flow battery accumulation of energy grid-connecting apparatus also is included as the ups power that described flow battery accumulation of energy net-connected controller provides operating voltage.
Based on above-mentioned flow battery accumulation of energy grid-connecting apparatus, the present invention provides a kind of flow battery accumulation of energy combination method simultaneously, may further comprise the steps:
(1), control module detects the magnitude of voltage of accumulation of energy module in real time, and compares with threshold value T;
(2), connect the accumulation of energy module, if accumulation of energy module voltage value, is then controlled first current transformer less than threshold value T for its fill discharge;
(3), connect the accumulation of energy module, if accumulation of energy module voltage value, is then controlled second current transformer more than or equal to threshold value T for its fill discharge.
Wherein, described first current transformer is the SCR current transformer, and described second current transformer is the IGBT current transformer.
Preferably, described threshold value T is 320V.
Compared with prior art, advantage of the present invention and good effect are: flow battery accumulation of energy grid-connecting apparatus of the present invention, based on the high-frequency electrical energy transformation theory, the efficient AC-DC technology of discharging and recharging is a core, and the energy two-way flow is divided into two grades by design with charging/discharging voltage, use SCR current transformer IGBT current transformer to discharge and recharge respectively, can the degree of depth discharge and recharge, in microgrid, play emergent independent reversion reaction, improved the effective rate of utilization of new electric energy.
After reading the detailed description of embodiment of the present invention in conjunction with the accompanying drawings, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the schematic block circuit diagram of a kind of embodiment of flow battery accumulation of energy grid-connecting apparatus proposed by the invention;
Fig. 2 is the part flow chart of a kind of embodiment of flow battery accumulation of energy grid-connecting apparatus proposed by the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is done explanation in further detail.
Embodiment one, referring to shown in Figure 1, the flow battery accumulation of energy grid-connecting apparatus of present embodiment, comprise control module P1, unsteady flow module P2, described unsteady flow module P2 is used for AC-DC conversion and DC-AC conversion, described unsteady flow module P2 one end connects external communication electrical input, an other end connects outside accumulation of energy module P3, described control module P1 detects the voltage of accumulation of energy module P3 in real time, generate control command and be sent to described unsteady flow module P2, control selects to carry out AC-DC conversion (charging process) or DC-AC conversion (discharge process), in charging process, be stored to accumulation of energy module P3 after by unsteady flow module P2 the external communication electricity being converted to direct current, perhaps in discharge process, after being converted to alternating current, the direct voltage that unsteady flow module P2 is stored accumulation of energy module P3 feeds back to electrical network, because the flow battery group is to utilize both positive and negative polarity electrolyte separately, a kind of high-performance storage battery of each self-loopa, has the capacity height, the use field is wide, it is long to recycle the life-span, the characteristics of can the degree of depth resetting electricity, and the charging of flow battery can be charged to 100% from 1% of capacity, the deposit electric weight can be put into 0-1% during discharge, and the accumulation of energy module P3 of present embodiment is the flow battery group.
As a specific embodiment, in the present embodiment, suppose to use 8 single heap 72VDC, 400A (specified charging/discharging voltage scope 40-65VDC) flow battery series connection accumulation of energy module, according to the flow battery characteristic, the flow battery accumulation of energy module P3 normally scope of discharging and recharging is 320-520VDC.Referring to shown in Figure 2, native system SCR (Silicon Controlled Rectifier, silicon controlled rectifier) current transformer P2-2 and IGBT (insulated gate bipolar transistor) current transformer P2-1 conversion threshold values is 320VDC, be to realize in the following scope of 320VDC discharging and recharging adopting SCR current transformer P2-2, use IGBT current transformer P2-1 in the 320-520VDC normal range of operation.Described control module P1 can adopt the components and parts with controlled function to realize (such as flow battery accumulation of energy net-connected controller), described unsteady flow module P2 comprises SCR current transformer P2-2 and IGBT current transformer P2-1, the alternating current input terminal connects accumulation of energy module P3 by SCR current transformer P2-2 on the one hand, connects accumulation of energy module P3 by IGBT current transformer P2-1 on the one hand in addition.When the first use of accumulation of energy module needs in particular cases to need to be lower than threshold values 320VDC charging in precharge or the use, described control module P1 is by detecting accumulation of energy module P3 voltage, make the work of SCR current transformer P2-2 rectifier system, finish the precharge of accumulation of energy module P3, detect the voltage of accumulation of energy module P3 in real time to 320VDC by described control module, stop the work of SCR current transformer, finish the precharge of accumulation of energy module P3.Subsequently, finish discharging and recharging in the accumulation of energy module 320-520VDC nominal working range by control module P1 control IGBT current transformer P2-1 according to actual needs, realize the flow battery accumulation of energy and the discharge of being incorporated into the power networks.When accumulation of energy module P3 needs deep discharge (as battery failures), described control module P1 is by detecting accumulation of energy module P3 voltage, make the work of SCR current transformer P2-2 inverting, finish the discharge of accumulation of energy module P3, detect the voltage of accumulation of energy module P3 in real time to 0VDC by described control module, stop SCR current transformer P2-2 work, finish the degree of depth of accumulation of energy module P3.During normal accumulation of energy, described if the range of voltage values of accumulation of energy module P3 is 320-520VDC, so IGBT current transformer P2-1 is as the main variable flow device.Current waveform is sinusoidal wave when p2-1 rectification of IGBT current transformer and inversion, the power factor height, and harmonic wave is little.SCR current transformer P2-2 only works at the accumulation of energy module pre-charge or when needing deep discharge, and service time is short, and probability is little, as auxiliary convertor assembly.Described SCR current transformer P2-2 and IGBT current transformer P2-1 conducting simultaneously.
If control module P1 adopts flow battery accumulation of energy net-connected controller, in order to provide stable operating voltage to described flow battery accumulation of energy grid-connecting apparatus, the grid-connecting apparatus of present embodiment also comprises ups power.
The flow battery accumulation of energy grid-connecting apparatus of present embodiment is based on the high-frequency electrical energy transformation theory, and the efficient AC-DC technology of discharging and recharging is a core, but the energy two-way flow degree of depth discharges and recharges.By design charging/discharging voltage is divided into two grades, use SCR current transformer and IGBT current transformer to discharge and recharge respectively, this device is applicable to the occasion of the dynamic energy storage of various needs, can be by flow battery storage electric energy more than needed, and when electric energy is not enough, generate electricity by way of merging two or more grid systems after with the electric energy inversion, by a series of conversion, with the form feedback grid of standard power frequency sine wave, in microgrid, can play emergent independent reversion reaction, improve the effective rate of utilization of new electric energy.The advantage of aspect such as that this device has simultaneously is energy-conservation, noiseless to electrical network, reliability is high, controllability is strong.
Based on above-mentioned flow battery accumulation of energy grid-connecting apparatus, present embodiment provides a kind of flow battery accumulation of energy combination method simultaneously, may further comprise the steps:
(1), control module detects the magnitude of voltage of accumulation of energy module in real time, and compares with threshold value T;
(2), connect the accumulation of energy module, if accumulation of energy module voltage value, is then controlled first current transformer less than threshold value T for its fill discharge;
(3), connect the accumulation of energy module, if accumulation of energy module voltage value, is then controlled second current transformer more than or equal to threshold value T for its fill discharge.
As previously described, according to the flow battery characteristic, the flow battery accumulation of energy module P3 normally scope of discharging and recharging is 320-520VDC.Preferably, the threshold value T in the present embodiment is 320V.In addition, this method is by adopting two cover current transformers, promptly, first current transformer is the SCR current transformer, second current transformer is the IGBT current transformer, realizes discharging and recharging in the following scope of 320VDC and adopts the SCR current transformer, uses the IGBT current transformer in the 320-520VDC normal range of operation.And then realize the purpose that the accumulation of energy module can the degree of depth be reset electricity, and make the charging of flow battery to be charged to 100% from 1% of capacity, the deposit electric weight can be put into 0-1% during discharge.
Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also should belong to protection scope of the present invention.
Claims (7)
1. flow battery accumulation of energy grid-connecting apparatus, it is characterized in that: comprise control module, be used for the unsteady flow module that AC-DC changes and DC-AC changes, described unsteady flow module one end connects external communication electrical input, an other end connects outside accumulation of energy module, described control module detects the voltage of accumulation of energy module in real time, generate control command and be sent to described unsteady flow module, described accumulation of energy module is the flow battery group.
2. flow battery accumulation of energy grid-connecting apparatus according to claim 1, it is characterized in that: described unsteady flow module comprises SCR current transformer and IGBT current transformer, the alternating current input terminal connects the accumulation of energy module by the SCR current transformer on the one hand, connect the accumulation of energy module by the IGBT current transformer on the one hand in addition, described control module is compared the back sending controling instruction to described SCR current transformer and IGBT current transformer with the magnitude of voltage of accumulation of energy module with preset threshold value, the conducting simultaneously of described SCR current transformer and IGBT current transformer.
3. according to the described flow battery accumulation of energy of each claim of claim 1-2 grid-connecting apparatus, it is characterized in that: described control module is a flow battery accumulation of energy net-connected controller.
4. want 3 described flow battery accumulation of energy grid-connecting apparatus according to right, it is characterized in that: described flow battery accumulation of energy grid-connecting apparatus also is included as the ups power that described flow battery accumulation of energy net-connected controller provides operating voltage.
5. flow battery accumulation of energy combination method is characterized in that: may further comprise the steps:
(1), control module detects the magnitude of voltage of accumulation of energy module in real time, and compares with threshold value T;
(2), connect the accumulation of energy module, if accumulation of energy module voltage value, is then controlled first current transformer less than threshold value T for its fill discharge;
(3), connect the accumulation of energy module, if accumulation of energy module voltage value, is then controlled second current transformer more than or equal to threshold value T for its fill discharge.
6. flow battery accumulation of energy combination method according to claim 5 is characterized in that: described first current transformer is the SCR current transformer, and described second current transformer is the IGBT current transformer.
7. according to claim 5 or 6 described flow battery accumulation of energy combination methods, it is characterized in that: described threshold value T is 320V.
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| CN114123279A (en) * | 2021-11-25 | 2022-03-01 | 国网湖南省电力有限公司 | Energy storage state of charge reference value prediction method and system of wind power energy storage hybrid system |
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Application publication date: 20111102 |