CN105356774A - Converter used for hybrid energy storage system - Google Patents
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- CN105356774A CN105356774A CN201510906073.1A CN201510906073A CN105356774A CN 105356774 A CN105356774 A CN 105356774A CN 201510906073 A CN201510906073 A CN 201510906073A CN 105356774 A CN105356774 A CN 105356774A
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Abstract
An embodiment of the invention provides a converter used for a hybrid energy storage system. According to the converter, an output end of a double-input isolation type half-bridge DC/DC converter is connected with a capacitor in parallel, which serves as an input end of an H bridge DC/AC converter single-stage H bridge, a first power supply filter inductor is connected to a first bridge arm of the double-input isolation type half-bridge DC/DC converter, which serves as a first input end of the converter used for the hybrid energy storage system, and a second power supply filter inductor is connected to a second bridge arm of the double-input isolation type half-bridge DC/DC converter, which serves as a second input end of the converter used for the hybrid energy storage system; and a left bridge arm of the H bridge DC/AC converter is connected with a first output filter inductor, which serves as a first output end of the converter used for the hybrid energy storage system, the first output end is used for being connected with a phase circuit of an alternating current side power grid, and a right bridge arm of the H bridge DC/AC converter is connected with a second output filter inductor, which serves as a second output end of the converter used for the hybrid energy storage system.
Description
Technical field
The present invention relates to power converter technical field, particularly a kind of current transformer for mixed energy storage system.
Background technology
Pressure from the energy, environment makes renewable energy power generation obtain increasing application.2010, Wind Energy In China and photovoltaic installed capacity were 30GW and 10GW respectively, and the target of 2015 is 150GW and 20GW respectively.The year two thousand twenty, regenerative resource will reach 15% in whole energy-consuming, and installed capacity of wind-driven power will reach 1.5 hundred million kW.But the generation of electricity by new energy based on wind energy and solar energy has natural fluctuation and intermittence, larger uncertainty is had when large-scale grid connection is run, and response speed is comparatively slow, this brings impact greatly and challenge to the stable of electric power system and control.Meanwhile, the stability of power system problem caused by load power fluctuation is also a major issue.Hybrid energy-storing is applied to electric power system as a kind of schedulable resource, can solve the problem well.
In addition, single energy-storage system of accumulator occurs that battery is low, responsive to some charge and discharge process, to high-power discharge and recharge and the problem such as frequent discharge and recharge adaptability is not strong, and ultracapacitor has the features such as fast response time, high-power fan-out capability is strong, service life cycle is long, just receiving increasing concern, but because its energy density is lower, be also difficult at present realize jumbo power energy storage.Storage battery and ultracapacitor is used in combination has larger technology economy advantage is the effective means stabilizing fitful power power fluctuation and network load fluctuation.
At present, the research Application comparison on electric automobile about storage battery-super capacitor mixed energy storage system (BSHES) is extensive.Due to the performance characteristics of BSHES, in the application aspect towards batch (-type) distributed power source, some theoretical researches and model measurement are there is both at home and abroad, BSHES is applied to distribution system, be the effective means stabilizing fitful power power fluctuation, network load power fluctuation at present, now become study hotspot.
The access way of storage battery and super capacitor is one of them research emphasis.At present, conventional access way is that both are in parallel or directly in parallel by converter, then accesses DC bus, then is connected to the grid by inverter.Although these structures can play increasing storage battery service life, improve the effects such as the maximum power output ability of mixed energy storage system, but it is low to there is capacity of super capacitor utilance, the course of work of storage battery can not be set flexibly, the restrictions such as the efficiency utilization of dissimilar energy storage device can not be realized.In addition, these structures exist that integrated level is low, hardware cost is high, floor space is large, loss is high, can not the defect such as modularized production, significantly limit the utilization and extention of hybrid energy-storing technology, need badly research and development low cost, can modularized production, high-power hybrid energy-storing technical scheme that floor space is little.
Prior art proposes the two-way multiport DC converter of a kind of non-isolated, though can realize the access of the different electric pressure power supply of input, owing to being non-isolated structure, can not realize low-pressure side and grid-connected on high-tension side electrical isolation.Prior art also proposes a kind of combined bidirectional DC/AC converter topologies, the power conversion of bidirectional high-efficiency DC/AC can be realized, though its distortion topology can realize multiport input, but because this body structure of topology limit, each input port voltage must ensure equal, therefore substantially reduces its range of application.
Summary of the invention
Embodiments provide a kind of current transformer for mixed energy storage system, equal technical problem must be ensured to solve each input port of current transformer in prior art voltage.This current transformer being used for mixed energy storage system comprises: dual input isolated form half-bridge DC/DC current transformer and H bridge DC/AC current transformer, wherein, the output shunt capacitor of described dual input isolated form half-bridge DC/DC current transformer, as the input of H bridge DC/AC current transformer single-stage H bridge, first power filter inductance is connected on the first brachium pontis of described dual input isolated form half-bridge DC/DC current transformer, as the first input end of the current transformer for mixed energy storage system, second source filter inductance is connected on the second brachium pontis of described dual input isolated form half-bridge DC/DC current transformer, as the second input of the current transformer for mixed energy storage system, described first brachium pontis and described second brachium pontis parallel connection, the left brachium pontis of described H bridge DC/AC current transformer connects the first output inductor, as the first output of the current transformer for mixed energy storage system, this first output is for connecting a circuitry phase of AC electrical network, the right brachium pontis of described H bridge DC/AC current transformer connects the second output inductor, as the second output of the current transformer for mixed energy storage system.
In one embodiment, described dual input isolated form half-bridge DC/DC current transformer is multiple, described H bridge DC/AC current transformer is the tandem type DC/AC current transformer of multiple H bridge cascade, wherein, the output described capacitor in parallel of a dual input isolated form half-bridge DC/DC current transformer, as the input of single-stage H bridge in tandem type DC/AC current transformer, multiple described dual input isolated form half-bridge DC/DC current transformers and multiple H bridge connect one to one; In described tandem type DC/AC current transformer, the left brachium pontis of first order H bridge connects described first output inductor, as the first output of the current transformer for mixed energy storage system, the right brachium pontis of first order H bridge is connected with the left brachium pontis of second level H bridge, the right brachium pontis of second level H bridge is connected with the left brachium pontis of third level H bridge, described multiple H bridge connects successively, and the right brachium pontis of afterbody H bridge connects described second output inductor, as the second output of the current transformer for mixed energy storage system.
In one embodiment, described dual input isolated form half-bridge DC/DC current transformer, comprise: the first switching tube, second switch pipe, 3rd switching tube, 4th switching tube, 5th switching tube, 6th switching tube, 7th switching tube, 8th switching tube, second capacitor, 3rd capacitor, 4th capacitor, 5th capacitor, high-frequency isolation transformer, resonant inductance, wherein, described first switching tube and described second switch pipe are composed in series described first brachium pontis, described 3rd switching tube and described 4th switching tube are composed in series described second brachium pontis, described first power filter inductance is connected to the tie point place of described first switching tube and described second switch pipe, as the first input end of described dual input isolated form half-bridge DC/DC current transformer, described second source filter inductance is connected to the tie point place of described 3rd switching tube and described 4th switching tube, as the second input of described dual input isolated form half-bridge DC/DC current transformer, described second capacitor and described 3rd capacitor are composed in series the 3rd brachium pontis, described 5th switching tube and described 6th switching tube are composed in series four bridge legs, described 3rd brachium pontis and described four bridge legs are all in parallel with described second brachium pontis, one end of described high-frequency isolation transformer primary side is connected to the junction of described second capacitor and described 3rd capacitor by described resonant inductance, the other end of described high-frequency isolation transformer primary side is connected to the junction of described 5th switching tube and described 6th switching tube, described 7th switching tube and described 8th switching tube are composed in series the 5th brachium pontis, described 4th capacitor and described 5th capacitor are composed in series the 6th brachium pontis, described 5th brachium pontis is in parallel with described 6th brachium pontis, one end of described high-frequency isolation transformer secondary side is connected to the junction of described 4th capacitor and described 5th capacitor, and the other end of described high-frequency isolation transformer secondary side is connected to the junction of described 7th switching tube and described 8th switching tube.
In one embodiment, in described dual input isolated form half-bridge DC/DC current transformer, on the first brachium pontis and the second brachium pontis, the duty ratio of switching tube is 0.5.
In one embodiment, described dual input isolated form half-bridge DC/DC current transformer comprises multiple described first brachium pontis, multiple described second brachium pontis, multiple described first power filter inductance and multiple described second source filter inductance, wherein, multiple described first brachium pontis is in parallel with multiple described second brachium pontis, multiple described first power filter inductance and multiple described first brachium pontis connect one to one, and multiple described second source filter inductance and multiple described second brachium pontis connect one to one.
In one embodiment, the switching frequency of described dual input isolated form half-bridge DC/DC current transformer work is 20 KHz.
In embodiments of the present invention, by the output shunt capacitor at dual input isolated form half-bridge DC/DC current transformer, as the input of H bridge DC/AC current transformer single-stage H bridge, first brachium pontis of dual input isolated form half-bridge DC/DC current transformer can connect ultracapacitor by the first power filter inductance, second brachium pontis can connect batteries by second source filter inductance, the left brachium pontis of H bridge DC/AC current transformer connects the first output inductor, as the first output of the current transformer for mixed energy storage system, the right brachium pontis of H bridge DC/AC current transformer connects the second output inductor, as the second output of the current transformer for mixed energy storage system, make can be directly incorporated into AC electrical network for the current transformer of mixed energy storage system by the first output and the second output, and then realize batteries and ultracapacitor access electrical network, owing to being connected to dual input isolated form half-bridge DC/DC current transformer on the basis of H bridge DC/AC current transformer, namely this current transformer being used for mixed energy storage system is combined by H bridge DC/AC current transformer and dual input isolated form half-bridge DC/DC current transformer, it is the combined bidirectional isolated form multi-port current transformer for mixed energy storage system, this topological structure being used for the current transformer of mixed energy storage system makes to achieve the different electric pressure power supply input of multiport, and each port energy can realize full decoupled, can independent Balance route.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form limitation of the invention.In the accompanying drawings:
Fig. 1 is the structure chart of a kind of current transformer for mixed energy storage system that the embodiment of the present invention provides;
Fig. 2 is the structural representation of a kind of current transformer for mixed energy storage system specifically that the embodiment of the present invention provides;
Fig. 3 is the embody rule schematic diagram of a kind of current transformer for mixed energy storage system that the embodiment of the present invention provides.
Fig. 4 is that a kind of photovoltaic plant that the embodiment of the present invention provides stabilizes front and back power stage curve synoptic diagram;
Fig. 5 is a kind of storage battery of providing of the embodiment of the present invention and ultracapacitor gross power curve of output schematic diagram;
Fig. 6 is a kind of storage battery of providing of the embodiment of the present invention and ultracapacitor power stage curve synoptic diagram separately;
Fig. 7 is a kind of transformer primary side voltage fluctuation waveform schematic diagram that the embodiment of the present invention provides;
Fig. 8 is a kind of Circuit Fault on Secondary Transformer voltage fluctuation waveform schematic diagram that the embodiment of the present invention provides;
Fig. 9 be the embodiment of the present invention provide a kind of energy storage device power output time resonant inductance both sides voltage matches waveform schematic diagrames;
Figure 10 be the embodiment of the present invention provide a kind of energy storage device absorbed power time resonant inductance both sides voltage matches waveform schematic diagrames.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with execution mode and accompanying drawing, the present invention is described in further details.At this, exemplary embodiment of the present invention and illustrating for explaining the present invention, but not as a limitation of the invention.
In embodiments of the present invention, provide a kind of current transformer for mixed energy storage system, (comprise 3 H bridges for 3 dual input isolated form half-bridge DC/DC current transformers, H bridge DC/AC current transformers) as shown in Figure 1, this current transformer being used for mixed energy storage system comprises: dual input isolated form half-bridge DC/DC current transformer 101 and H bridge DC/AC current transformer 102, wherein
The output shunt capacitor C1 of described dual input isolated form half-bridge DC/DC current transformer, as the input of H bridge DC/AC current transformer single-stage H bridge, first power filter inductance L i1 is connected on the first brachium pontis B1 of described dual input isolated form half-bridge DC/DC current transformer, as the current transformer for mixed energy storage system first input end (such as, the positive pole of ultracapacitor SC1 is by connection first power filter inductance L i1, realize being connected with the first input end of the current transformer for mixed energy storage system), second source filter inductance Li2 is connected on the second brachium pontis B2 of described dual input isolated form half-bridge DC/DC current transformer, as the current transformer for mixed energy storage system the second input (such as, the positive pole of batteries BESS1 is by connecting second source filter inductance Li2, realize being connected with the second input of the current transformer for mixed energy storage system), described first brachium pontis B1 and described second brachium pontis B2 is in parallel,
The left brachium pontis B7 of described H bridge DC/AC current transformer connects the first output inductor Lo1, as the first output of the current transformer for mixed energy storage system, this first output is for connecting a circuitry phase of AC electrical network, the right brachium pontis B8 of described H bridge DC/AC current transformer connects the second output inductor Lo2, as the second output of the current transformer for mixed energy storage system.
Known as shown in Figure 1, in embodiments of the present invention, by the output shunt capacitor at dual input isolated form half-bridge DC/DC current transformer, as the input of H bridge DC/AC current transformer single-stage H bridge, first brachium pontis of dual input isolated form half-bridge DC/DC current transformer can connect ultracapacitor by the first power filter inductance, second brachium pontis can connect batteries by second source filter inductance, the left brachium pontis of H bridge DC/AC current transformer connects the first output inductor, as the first output of the current transformer for mixed energy storage system, the right brachium pontis of H bridge DC/AC current transformer connects the second output inductor, as the second output of the current transformer for mixed energy storage system, make can be directly incorporated into AC electrical network for the current transformer of mixed energy storage system by the first output and the second output, and then realize batteries and ultracapacitor access electrical network, owing to being connected to dual input isolated form half-bridge DC/DC current transformer on the basis of H bridge DC/AC current transformer, namely this current transformer being used for mixed energy storage system is combined by H bridge DC/AC current transformer and dual input isolated form half-bridge DC/DC current transformer, it is the combined bidirectional isolated form multi-port current transformer for mixed energy storage system, this topological structure being used for the current transformer of mixed energy storage system makes to achieve the different electric pressure power supply input of multiport, and each port energy can realize full decoupled, can independent Balance route, the active power two-way flow of AC and DC side and the reactive power compensation of AC system can also be realized, this current transformer being used for mixed energy storage system can be used for the power output of level and smooth renewable energy power generation, reduce it to adverse effects such as the impacts of electrical network, wherein ultracapacitor mainly stabilizes the big ups and downs of power, and long-term power fluctuation slowly mainly stabilized by storage battery.
During concrete enforcement, an above-mentioned current transformer for mixed energy storage system is connected to a circuitry phase of electrical network, such as, A, B, C three-phase circuit of electrical network connects respectively an above-mentioned current transformer for mixed energy storage system.
During concrete enforcement, as shown in Figure 1, described dual input isolated form half-bridge DC/DC current transformer, comprising: the first switching tube S1, second switch pipe S2, the 3rd switching tube S3, the 4th switching tube S4,5th switching tube S5, the 6th switching tube S6, the 7th switching tube S7,8th switching tube S8, the second capacitor C2, the 3rd capacitor C3,4th capacitor C4, the 5th capacitor C5, high-frequency isolation transformer T, resonant inductance Ls, wherein
Described first switching tube S1 and described second switch pipe S2 is composed in series described first brachium pontis B1, described 3rd switching tube S3 and described 4th switching tube S4 is composed in series described second brachium pontis B2, described first power filter inductance L i1 is connected to the tie point place of described first switching tube S1 and described second switch pipe S2, as the first input end of described dual input isolated form half-bridge DC/DC current transformer, described second source filter inductance Li2 is connected to the tie point place of described 3rd switching tube S3 and described 4th switching tube S4, as the second input of described dual input isolated form half-bridge DC/DC current transformer,
Described second capacitor C2 and described 3rd capacitor C3 is composed in series the 3rd brachium pontis B3, described 5th switching tube S5 and described 6th switching tube S6 is composed in series four bridge legs B4, described 3rd brachium pontis B3 and described four bridge legs B4 is all in parallel with described second brachium pontis B2, one end of described high-frequency isolation transformer T primary side is connected to the junction of described second capacitor C2 and described 3rd capacitor C3 by described resonant inductance Ls, the other end of described high-frequency isolation transformer T primary side is connected to the junction of described 5th switching tube S5 and described 6th switching tube S6;
Described 7th switching tube S7 and described 8th switching tube S8 is composed in series the 5th brachium pontis B5, described 4th capacitor C4 and described 5th capacitor C5 is composed in series the 6th brachium pontis B6, described 5th brachium pontis B5 is in parallel with described 6th brachium pontis B6, one end of described high-frequency isolation transformer T secondary side is connected to the junction of described 4th capacitor C4 and described 5th capacitor C5, and the other end of described high-frequency isolation transformer T secondary side is connected to the junction of described 7th switching tube S7 and described 8th switching tube S8.
Concrete, as shown in Figure 1, single-stage H bridge in above-mentioned H bridge DC/AC current transformer comprises: the 9th switching tube S9, tenth switching tube S10, 11 switching tube S11, twelvemo closes pipe S12, first output inductor Lo1, second output inductor Lo2, wherein, the left brachium pontis B7 that 9th switching tube S9 and the tenth switching tube S10 is composed in series, 11 switching tube S11 and twelvemo close the right brachium pontis B8 that pipe S12 is composed in series, left brachium pontis B7 and right brachium pontis B8 is all parallel on capacitor C1, when there being multiple H bridge cascade, as shown in Figure 1, example is cascaded as with 3 H bridges, the left brachium pontis B7 of first order H bridge connects first output of the first output inductor Lo1 as the above-mentioned current transformer for mixed energy storage system, the right brachium pontis B8 of first order H bridge links the left brachium pontis of next stage H bridge, with this rule cascade to the last one-level H bridge, the right brachium pontis of afterbody H bridge is through second output of the second output inductor Lo2 as the above-mentioned current transformer for mixed energy storage system.
During concrete enforcement, in order to realize the large power energy storage power station being applicable to based on hybrid energy-storing for the current transformer of mixed energy storage system, large-sized photovoltaic, the high-power meritorious adjustment of wind energy electric station grid connection and reactive power compensation can be realized, also can be used for the occasion such as the tune paddy peak regulation of load, the frequency modulation and voltage modulation of micro-capacitance sensor, make it have wide application prospect.In the present embodiment, described dual input isolated form half-bridge DC/DC current transformer is multiple, described H bridge DC/AC current transformer is the tandem type DC/AC current transformer of multiple H bridge cascade, as shown in Figure 1, the output described capacitor in parallel of a dual input isolated form half-bridge DC/DC current transformer, as the input of single-stage H bridge in tandem type DC/AC current transformer, multiple described dual input isolated form half-bridge DC/DC current transformers and multiple H bridge connect one to one; In described tandem type DC/AC current transformer, the left brachium pontis B7 of first order H bridge connects described first output inductor Lo1, as the first output of the current transformer for mixed energy storage system, the right brachium pontis B8 of first order H bridge is connected with the left brachium pontis of second level H bridge, the right brachium pontis of second level H bridge is connected with the left brachium pontis of third level H bridge, described in rule, multiple H bridge connects successively successively, the right brachium pontis B8 of afterbody H bridge connects described second output inductor Lo2, as the second output of the current transformer for mixed energy storage system.By the cascade system of multiple H bridge, the above-mentioned current transformer for mixed energy storage system can be made directly to access high-voltage fence (10kV or 35kV), eliminate grid-connected transformer, reduce costs further.
During concrete enforcement, the above-mentioned current transformer for mixed energy storage system also can comprise a dual input isolated form half-bridge DC/DC current transformer, described H bridge DC/AC current transformer comprises a H bridge construction, now, the output shunt capacitor C1 of this dual input isolated form half-bridge DC/DC current transformer, as the input of single-stage H bridge in H bridge DC/AC current transformer, in H bridge DC/AC current transformer, the left brachium pontis B7 of single-stage H bridge connects the first output inductor Lo1, as the first output of the current transformer for mixed energy storage system, in H bridge DC/AC current transformer, the right brachium pontis B8 of single-stage H bridge connects the first output inductor Lo2, as the second output of the current transformer for mixed energy storage system.
During concrete enforcement, in order to the energy transferring of multiple port to the second capacitor C2 and the 3rd capacitor C3 can increase the regulating power of current transformer, and the independent Balance route of each port energy can be realized, in the present embodiment, as shown in Figure 2, above-mentioned dual input isolated form half-bridge DC/DC current transformer comprises multiple described first brachium pontis, multiple described second brachium pontis, multiple described first power filter inductance and multiple described second source filter inductance, wherein, multiple described first brachium pontis is in parallel with multiple described second brachium pontis, multiple described first power filter inductance and multiple described first brachium pontis connect one to one, form multiple first input end, multiple described second source filter inductance and multiple described second brachium pontis connect one to one, form multiple second input, realize the topological structure of the combined bidirectional isolated form multi-port current transformer being used for mixed energy storage system.
During concrete enforcement, in above-mentioned dual input isolated form half-bridge DC/DC current transformer, on the first brachium pontis and the second brachium pontis, the duty ratio of switching tube is 0.5, only just need can realize the former secondary voltage coupling of high-frequency isolation transformer T by the mode of phase shift.The voltage-regulation to high-frequency isolation transformer T primary side DC bus-bar voltage can be realized by the switching tube duty ratio on adjustment multiport isolated half-bridge DC/DC current transformer first brachium pontis B1 and the second brachium pontis B2, there is very wide voltage matches ability, under the condition that input side (generally connecing bank of super capacitors and battery pack) voltage fluctuation is very large, the constant of high-frequency isolation transformer T primary side DC bus-bar voltage can be maintained.
Concrete, can powerful adjustment be carried out by the phase shifting angle of the switching tube on adjustment multiport isolated half-bridge DC/DC current transformer four bridge legs B4 and the 5th brachium pontis B5, and the two-way flow of energy can be realized.The constant of high-frequency isolation transformer T secondary side DC bus-bar voltage can also be maintained by phase shift, guarantee the normal operation of tandem type H bridge DC/AC current transformer.
During concrete enforcement, multiport isolated half-bridge DC/DC current transformer can work under higher switching frequency (20kHz), greatly can reduce volume and the cost of isolating transformer.
During concrete enforcement, the above-mentioned current transformer for mixed energy storage system both can use as the inverter of high-power hybrid energy-storing power station access electrical network, also can use to the rectifier of hybrid energy-storing equipment charge as electrical network, also can be used as Static Var Compensator.The above-mentioned current transformer for mixed energy storage system is applied to high-power hybrid energy-storing power station and stabilizes grid power fluctuation field, the big ups and downs that ultracapacitor stabilizes power can be realized, and long-term power fluctuation slowly stabilized by storage battery, thus play super capacitor and storage battery advantage separately, increasing storage battery service life, realizes higher economic benefit.
The above-mentioned current transformer for mixed energy storage system is described in detail below in conjunction with concrete example.For the topological structure of the above-mentioned current transformer for mixed energy storage system shown in Fig. 3, get the A that cascade module number is n=1, B, C tri-modules (i.e. the above-mentioned current transformer for mixed energy storage system of each module to be a cascade module number be n=1), namely three the above-mentioned current transformer for mixed energy storage system line voltage accessed respectively containing photovoltaic plant is the electrical network A phase of 380V, B phase and C phase, first output of A module connects electrical network A phase, second output of A module connects the second output of B module, first output of B module connects electrical network B phase, first output of C module connects electrical network C phase, second output of C module connects the second output of B module, A, B, C tri-module is star-like connected mode.Current transformer for mixed energy storage system comprises dual input isolated form half-bridge DC/DC current transformer, a H bridge DC/AC current transformer and comprises one-level H bridge construction.With reference to the device number in figure 1, in Fig. 3, each device parameters arranges a Li1=Li2=1mH, Ls=20 μ H, C1=5mF, C2=C3=4mF, C4=C5=10mF, high-frequency isolation transformer T no-load voltage ratio is 1:1, bank of super capacitors rated voltage 180V, and batteries rated voltage is also 180V, Lo1=4mH, Lo2=0mH; Loa1=Lob1=Loc1=4mH, all controls transformer primary side, secondary side DC bus-bar voltage as 360V.Matlab/Simulink/PLECS carries out electromagnetic transient simulation.Fig. 4 is the output power curve of photovoltaic plant before and after mixed energy storage system access power distribution network.Known by Fig. 4 (curve 1 stabilizes rear output power curve, and curve 2 stabilizes front output power curve), mixed energy storage system well can stabilize the big ups and downs of photovoltaic plant power stage, to reach grid-connected requirement.
Fig. 5 is the total output power curve of energy-storage system, it stabilized by photovoltaic plant before and after power stage difference determine.Fig. 6 is storage battery and ultracapacitor output power curve separately, curve 3 is storage battery output power curves, curve 4 is ultracapacitor output power curves, as shown in Figure 6, by carrying out current constant control to storage battery power output, Isobarically Control being carried out to ultracapacitor power output, storage battery can be realized and stabilize long-term power fluctuation slowly, and ultracapacitor stabilizes more violent power fluctuation, thus give full play to storage battery and ultracapacitor advantage separately.
Fig. 7 is transformer primary side DC bus-bar voltage perturbation waveform, Fig. 8 is Circuit Fault on Secondary Transformer DC bus-bar voltage waveform, as seen from the figure, when external power fluctuates, by the adjustment of device itself, can be good at transformer primary side, secondary side DC bus-bar voltage to maintain about 360V.
When Fig. 9 is energy storage device power output, resonant inductance both sides voltage U p0, Up1 and electric current I p1 mate waveform, and curve 5 is voltage U p0 curves, and curve 6 is voltage U p1 curves, and curve 7 is voltage Ip1 curves; The match condition of resonant inductance both sides voltage U p0, Up1 and electric current I p1 when Figure 10 is hybrid accumulator absorbed power, curve 8 is voltage U p0 curves, and curve 9 is voltage U p1 curves, and curve 10 is voltage Ip1 curves; Comparison diagram 9 and Figure 10 known, advanced or delayed by phase shifting control adjustment transformer both sides voltage phase angle, substantially can realize voltage matches, and also achieve the two-way flow of energy.
In embodiments of the present invention, by the output shunt capacitor at dual input isolated form half-bridge DC/DC current transformer, as the input of H bridge DC/AC current transformer single-stage H bridge, first brachium pontis of dual input isolated form half-bridge DC/DC current transformer can connect ultracapacitor by the first power filter inductance, second brachium pontis can connect batteries by second source filter inductance, the left brachium pontis of H bridge DC/AC current transformer connects the first output inductor, as the first output of the current transformer for mixed energy storage system, the right brachium pontis of H bridge DC/AC current transformer connects the second output inductor, as the second output of the current transformer for mixed energy storage system, make can be directly incorporated into AC electrical network for the current transformer of mixed energy storage system by the first output and the second output, and then realize batteries and ultracapacitor access electrical network, owing to being connected to dual input isolated form half-bridge DC/DC current transformer on the basis of H bridge DC/AC current transformer, namely this current transformer being used for mixed energy storage system is combined by H bridge DC/AC current transformer and dual input isolated form half-bridge DC/DC current transformer, it is the combined bidirectional isolated form multi-port current transformer for mixed energy storage system, this topological structure being used for the current transformer of mixed energy storage system makes to achieve the different electric pressure power supply input of multiport, and each port energy can realize full decoupled, can independent Balance route, the active power two-way flow of AC and DC side and the reactive power compensation of AC system can also be realized, this current transformer being used for mixed energy storage system can be used for the power output of level and smooth renewable energy power generation, reduce it to adverse effects such as the impacts of electrical network, wherein ultracapacitor mainly stabilizes the big ups and downs of power, and long-term power fluctuation slowly mainly stabilized by storage battery.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. for a current transformer for mixed energy storage system, it is characterized in that, comprising: dual input isolated form half-bridge DC/DC current transformer and H bridge DC/AC current transformer, wherein,
The output shunt capacitor of described dual input isolated form half-bridge DC/DC current transformer, as the input of H bridge DC/AC current transformer single-stage H bridge, first power filter inductance is connected on the first brachium pontis of described dual input isolated form half-bridge DC/DC current transformer, as the first input end of the current transformer for mixed energy storage system, second source filter inductance is connected on the second brachium pontis of described dual input isolated form half-bridge DC/DC current transformer, as the second input of the current transformer for mixed energy storage system, described first brachium pontis and described second brachium pontis parallel connection;
The left brachium pontis of described H bridge DC/AC current transformer connects the first output inductor, as the first output of the current transformer for mixed energy storage system, this first output is for connecting a circuitry phase of AC electrical network, the right brachium pontis of described H bridge DC/AC current transformer connects the second output inductor, as the second output of the current transformer for mixed energy storage system.
2., as claimed in claim 1 for the current transformer of mixed energy storage system, it is characterized in that, described dual input isolated form half-bridge DC/DC current transformer is multiple, and described H bridge DC/AC current transformer is the tandem type DC/AC current transformer of multiple H bridge cascade, wherein,
The output described capacitor in parallel of a dual input isolated form half-bridge DC/DC current transformer, as the input of single-stage H bridge in tandem type DC/AC current transformer, multiple described dual input isolated form half-bridge DC/DC current transformers and multiple H bridge connect one to one;
In described tandem type DC/AC current transformer, the left brachium pontis of first order H bridge connects described first output inductor, as the first output of the current transformer for mixed energy storage system, the right brachium pontis of first order H bridge is connected with the left brachium pontis of second level H bridge, the right brachium pontis of second level H bridge is connected with the left brachium pontis of third level H bridge, described multiple H bridge connects successively, and the right brachium pontis of afterbody H bridge connects described second output inductor, as the second output of the current transformer for mixed energy storage system.
3., as claimed in claim 1 for the current transformer of mixed energy storage system, it is characterized in that, described dual input isolated form half-bridge DC/DC current transformer, comprising: the first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, 5th switching tube, the 6th switching tube, the 7th switching tube, 8th switching tube, the second capacitor, the 3rd capacitor, 4th capacitor, the 5th capacitor, high-frequency isolation transformer, resonant inductance, wherein
Described first switching tube and described second switch pipe are composed in series described first brachium pontis, described 3rd switching tube and described 4th switching tube are composed in series described second brachium pontis, described first power filter inductance is connected to the tie point place of described first switching tube and described second switch pipe, as the first input end of described dual input isolated form half-bridge DC/DC current transformer, described second source filter inductance is connected to the tie point place of described 3rd switching tube and described 4th switching tube, as the second input of described dual input isolated form half-bridge DC/DC current transformer;
Described second capacitor and described 3rd capacitor are composed in series the 3rd brachium pontis, described 5th switching tube and described 6th switching tube are composed in series four bridge legs, described 3rd brachium pontis and described four bridge legs are all in parallel with described second brachium pontis, one end of described high-frequency isolation transformer primary side is connected to the junction of described second capacitor and described 3rd capacitor by described resonant inductance, the other end of described high-frequency isolation transformer primary side is connected to the junction of described 5th switching tube and described 6th switching tube;
Described 7th switching tube and described 8th switching tube are composed in series the 5th brachium pontis, described 4th capacitor and described 5th capacitor are composed in series the 6th brachium pontis, described 5th brachium pontis is in parallel with described 6th brachium pontis, one end of described high-frequency isolation transformer secondary side is connected to the junction of described 4th capacitor and described 5th capacitor, and the other end of described high-frequency isolation transformer secondary side is connected to the junction of described 7th switching tube and described 8th switching tube.
4. as claimed in claim 3 for the current transformer of mixed energy storage system, it is characterized in that, in described dual input isolated form half-bridge DC/DC current transformer, on the first brachium pontis and the second brachium pontis, the duty ratio of switching tube is 0.5.
5. the current transformer for mixed energy storage system according to any one of Claims 1-4, it is characterized in that, described dual input isolated form half-bridge DC/DC current transformer comprises multiple described first brachium pontis, multiple described second brachium pontis, multiple described first power filter inductance and multiple described second source filter inductance, wherein, multiple described first brachium pontis is in parallel with multiple described second brachium pontis, multiple described first power filter inductance and multiple described first brachium pontis connect one to one, multiple described second source filter inductance and multiple described second brachium pontis connect one to one.
6. the current transformer for mixed energy storage system according to any one of Claims 1-4, is characterized in that, the switching frequency of described dual input isolated form half-bridge DC/DC current transformer work is 20 KHz.
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