CN103227583B - A kind of hot swap type converter system for new forms of energy and energy-storage system - Google Patents
A kind of hot swap type converter system for new forms of energy and energy-storage system Download PDFInfo
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Abstract
The invention discloses a kind of hot swap type converter system for new forms of energy and energy-storage system, comprise DC power supply, two-way DC/DC current transformer, DC bus, two-way DC/AC power converter, grid-connected switch.Adopt two-way DC/DC current transformer that array is accessed inversion system, enable the adaptive various ways array of system.Adopt direct current power carrier communication mode, system is installed or keeps in repair easier, quick, parallel running is more reliable, is convenient to adopt various sharing control strategy.This communication mode coordinates Hot-Plug Power switch to realize the hot plug of array and two-way DC/DC current transformer again; thus effectively overcome traditional DC/AC inversion system DC side array under fault or maintenance condition; need the shortcoming that power-off is shut down; improve reliability and the fault-tolerant ability of whole system, be also convenient to the capacity expanding whole system simultaneously.
Description
Technical field
The present invention relates to a kind of hot swap type array converter system, can be used for parallel connection and the hot plug of array in energy-storage system, also can be used for parallel connection and the hot plug of array in other DC/AC inversion system (such as solar energy or wind energy inversion system).
Background technology
Due to exploitation and the use in century more than one, the limited world's fossil fuel resource of reserves reduces day by day, and can approach exhaustion in the near future.On the other hand, a large amount of uses of fossil fuel, also make global warming, environment is subject to severe contamination.Therefore active development and utilize new forms of energy, improves energy resource structure, improves environmental protection, could take the good opportunity, and seize the strategic high ground of economic growth in the new round industrial revolution in technical development.
New forms of energy all multi-form in, especially strikingly solar energy and wind energy because their aboundresources, inexhaustible, and in use little to environmental impact.But solar energy and wind energy also have the notable feature being unfavorable for using, that is exactly intermittence, fluctuation and uncontrollability.For ensureing continuity and the harmony of power supply, and on the impact of electrical network and impact when reducing solar energy and wind energy access electrical network, must energy storage technology be greatly developed, realize the functions such as balance, adjustment, electric power storage, peak load shifting.
In energy storage technology, energy-storage battery is an extremely crucial part, its Main Function is the electric energy providing electric energy for energy storage inverter or accept energy storage inverter transmission, thus stabilize the fluctuation of the random electric energy of distributed power source fast and effectively, improve electrical network to the ability to arrange jobs of large solar, wind energy.And dispatch command can be accepted carry out peak load shifting and reactive power is provided, to improve the quality of power supply and the economic benefit of electrical network.At electric network fault with when having a power failure, also possesses the ability that independence networking is powered, to improve the Supply Security of load.
But in many application scenarios of energy storage technology, the appearance of various important power consumption equipment is had higher requirement to energy-storage battery, as the requirement of the aspects such as reliability, stability and redundancy.These occasions comprise when electric network fault and power failure need rely on energy-storage system independence networking time, energy-storage battery needs maintenance or trouble hunting time etc., all require that energy-storage battery still can be powered to important power consumption equipment.And high reliability occasion high-power at some in addition, depends merely on the problem increasing the series-parallel quantity of array and not only bring current-sharing, all press, and is difficult to the fail safe under guarantee failure condition.For this reason, hot plug technology and electric supply parallel technology are applied to array converter system, just can obtain the best solution of the problems referred to above.
Existing about in the achievement in research of hot plug technology or electric supply parallel technology, document " application of power line communication in inverter arcless breaking; Duan Shanxu; power electronic technology; the 1st phase in 2004 " devises a kind of inverter wireless parallel operation control program of power line communication, namely each shunt chopper is exchanged by common low pressure and exports bus, exchanges information each other in the mode of power line carrier communication, thus realizes the meritorious of load and idle effectively dividing equally.But the program is applicable to inverter parallel, the hot plug of array can not be realized.Existing Patents only solves the equal flow problem of DC/DC wired in parallel, does not provide the scheme realizing array hot plug.
In sum, the problem that traditional array series-parallel system exists current-sharing, all presses, and series-parallel system is difficult to be applied among multi-form energy-storage units, work in same energy storage inverter as batteries, bank of super capacitors, flying wheel battery etc. are difficult to connection in series-parallel.Although DC/DC parallel arrangement of the prior art can carry out sharing control, fail to realize the hot plug of array.When unit arbitrary in array breaks down, the fail safe of DC/DC current transformer and even whole inversion system is all difficult to ensure.
Summary of the invention
The present invention seeks to overcome the deficiencies in the prior art, a kind of hot swap type array converter system is provided, can adaptive various ways array, and make multiple array parallel connections stand-by heat each other, in the array of DC side, under a certain cell failure or maintenance condition, whole inversion system can charging operation.
For solving the problems of the technologies described above, the invention provides a kind of hot swap type converter system for new forms of energy and energy-storage system, it is characterized in that, comprise DC power supply, two-way DC/DC current transformer, DC bus, two-way DC/AC power converter, grid-connected switch;
Wherein the two ends of two-way DC/DC current transformer are connected with DC power supply, DC bus respectively, and one end of two-way DC/AC power converter is connected with DC bus, and the other end is connected on electrical network by grid-connected switch;
The energy of storage is transformed to the direct current energy of voltage identical with DC bus by DC power supply by two-way DC/DC current transformer, be transported on DC bus; Electric energy on DC bus is AC energy by the inversion of two-way DC/AC power converter again, is transported on electrical network; Or the electric energy on electrical network becomes direct current energy by the rectification of two-way DC/AC power converter and is transported to DC bus, then charged to DC power supply by two-way DC/DC current transformer, store energy in DC power supply.
Described two-way DC/DC current transformer is one or more, and all two-way DC/DC current transformers are connected on DC bus by form in parallel.
Between two-way DC/DC current transformer, and communicated by the mode of the direct current carrier without interconnection line between two-way DC/DC current transformer and two-way DC/AC power converter, realize the two-way current-sharing of DC/DC current transformer and the cooperation control of whole system.
The inversion of two-way DC/AC power converter is the output of AC energy is single-phase or three-phase electricity.
Described two-way DC/DC current transformer comprises: two-way DC/DC convertor circuit, electric current, circuit for testing voltage, signal coupling circuit, Hot-Plug Power switch, DC/DC converter control system; Wherein, two-way DC/DC convertor circuit input is connected with DC power supply, and output is connected with electric current, circuit for testing voltage, communicates mutually with DC/DC converter control system simultaneously, and the order accepting DC/DC converter control system controls Hot-Plug Power switch; The input of electric current, circuit for testing voltage is connected with two-way DC/DC convertor circuit, and output is connected with signal coupling circuit by Hot-Plug Power switch, uploads electric current, voltage test signal to DC/DC converter control system simultaneously; Signal coupling circuit input is connected with electric current, circuit for testing voltage by Hot-Plug Power switch, and output is connected with DC bus, communicates mutually with DC/DC converter control system simultaneously.
Communication mode after each parallel connection two-way DC/DC current transformer is in parallel with two-way DC/AC power converter adopts direct current power carrier wave, the signal produced by the control circuit in two-way DC/DC current transformer or two-way DC/AC power converter sends modulation circuit, signal coupling circuit by carrier wave successively, is finally coupled on DC bus; And the signal of DC bus is successively by signal coupling circuit, carrier wave receiving demodulation circuit, finally make the control circuit reception in two-way DC/DC current transformer or two-way DC/AC power converter from the signal of DC bus.
The step that heat inserts two-way DC/DC current transformer is: two-way DC/DC current transformer inserts and starts hot insertion program, the two-way DC/DC current transformer adjustment output voltage of this insertion, until described Hot-Plug Power switch ends voltage difference is less than given voltage threshold value U Δ, now described Hot-Plug Power switch closes merga pass communication and realizes current-sharing, finally completes heat and inserts.
The step that any one hot drawing in multiple two-way DC/DC current transformer side by side goes out is: start hot drawing and go out program, the electric current of described Hot-Plug Power switch is flow through in this two-way DC/DC current transformer adjustment of extracting in advance, until be less than specified current flow threshold value I Δ, now disconnect described Hot-Plug Power switch and make all the other DC/DC current transformer communications realize current-sharing, finally extracting DC/DC current transformer.
Described DC power supply is array or solar panel.
Described DC power supply is DC energy storage unit, and described DC energy storage unit is array, batteries, lithium battery group, bank of super capacitors or flying wheel battery.
The beneficial effect that the present invention reaches:
The present invention adopts two-way DC/DC current transformer that array is accessed inversion system, enables the adaptive various ways array of system.Adopt direct current power carrier communication mode, eliminate the control connection line between DC/DC converter cell in parallel, system is installed or keeps in repair easier, quick, parallel running is more reliable, and is convenient to adopt various sharing control strategy.This communication mode coordinates Hot-Plug Power switch just can realize the hot plug of array and two-way DC/DC current transformer again; DC/AC inversion system DC side array is enable to carry out hot plug, multiple array parallel connections stand-by heat each other; thus effectively overcome traditional DC/AC inversion system DC side array under fault or maintenance condition; need the shortcoming that power-off is shut down; improve reliability and the fault-tolerant ability of whole system, be also convenient to the capacity expanding whole system simultaneously.
Accompanying drawing explanation
Fig. 1 is system configuration schematic diagram of the present invention;
Fig. 2 is two-way DC/DC current transformer composition structural representation;
Fig. 3 is system communication and control schematic diagram;
Fig. 4 a is that heat inserts realization flow schematic diagram;
Fig. 4 b is that hot drawing goes out realization flow schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
Be illustrated in figure 1 system configuration schematic diagram of the present invention.Whole system chief component comprises: array 1, two-way DC/DC current transformer 2, DC bus 3, two-way DC/AC power converter 4, grid-connected switch 5, electrical network 6.Wherein the input of two-way DC/DC current transformer 2 is connected with array 1, and output is connected with DC bus 3.The input of two-way DC/AC power converter 4 is connected with DC bus 3 simultaneously, and output is connected on electrical network 6 by grid-connected switch 5.
Its operation principle is: the energy of storage is transformed to the direct current energy of identical voltage by array 1 by two-way DC/DC current transformer 2, be transported on DC bus 3; Electric energy on DC bus 3 is AC energy by the inversion of two-way DC/AC power converter 4 again, is transported on electrical network 6.Electric energy also can flow in the other direction, and the electric energy namely on electrical network 6 becomes direct current energy by the rectification of two-way DC/AC power converter 4 and is transported to DC bus 3, then charges to array 1 by two-way DC/DC current transformer 2, stores energy in array 1.
In other embodiments, array 1 can be the DC energy storage unit of various ways, such as batteries, lithium battery group, bank of super capacitors, flying wheel battery etc.; In non-energy storage occasion, array 1 also can be solar panel or other forms of DC power supply.
The quantity of two-way DC/DC current transformer 2 can be one, also can be more than 2 or 2, and the two-way DC/DC current transformer 2 of all quantity is connected on DC bus 3 by form in parallel.Between two-way DC/DC current transformer 2, and communicated by the mode of no control interconnection direct current carrier between two-way DC/DC current transformer 2 and two-way DC/AC power converter 4, realize the two-way current-sharing of DC/DC current transformer 2 and the cooperation control of whole system.
The output of the present invention two-way DC/AC power converter 4 both can be single-phase form, also can be the form of three-phase.The output loop of two-way DC/AC power converter 4 can increase grid-connected transformer depending on grid-connected electric pressure.
When electrical network 6 fault or when having a power failure, the present invention can independence networking, at this moment two-way DC/AC power converter 4 is connected directly between in power load by grid-connected switch 5, also two-way DC/AC power converter 4 can be connected on the ac bus after independence networking by grid-connected switch 5.
Be illustrated in figure 2 two-way DC/DC current transformer 2 of the present invention and form structural representation, two-way DC/DC current transformer composition mainly comprises: two-way DC/DC convertor circuit 7, electric current, circuit for testing voltage 8, signal coupling circuit 9, Hot-Plug Power switch 10(or common power switch), DC/DC converter control system 11.Wherein two-way DC/DC convertor circuit 7 input is connected with array 1, export and be connected with electric current, circuit for testing voltage 8, communicate mutually with DC/DC converter control system 11, and the order accepting DC/DC converter control system 11 goes to control Hot-Plug Power switch 10 simultaneously; The input of electric current, circuit for testing voltage 8 is connected with two-way DC/DC convertor circuit 7, and output is connected with signal coupling circuit 9 by Hot-Plug Power switch 10, uploads electric current, voltage test signal to DC/DC converter control system 11 simultaneously; Signal coupling circuit 9 input is connected with electric current, circuit for testing voltage 8 by Hot-Plug Power switch 10, and output is connected with DC bus 3, communicates mutually with DC/DC converter control system 11 simultaneously.
The operation principle of two-way DC/DC current transformer is: the DC voltage conversion of array 1 is the direct voltage identical with DC bus 3 by two-way DC/DC convertor circuit 7, and realize to the function of array 1 charging, utilize the bottom layer driving circuit of its inside to go to control Hot-Plug Power switch 10 simultaneously and realize hot plug; Direct current, voltage that electric current, circuit for testing voltage 8 export in order to test two-way DC/DC convertor circuit 7, after Hot-Plug Power switch 10 is closed, the voltage of its test that is to say the voltage of DC bus 3; Signal coupling circuit 9 in order to by the signal transmission of DC/DC converter control system 11 on DC bus 3, and receive the information on DC bus 3; DC/DC converter control system 11 is control centres of two-way DC/DC current transformer.
Be illustrated in figure 3 system communication of the present invention and control schematic diagram.The present invention adopts the communication mode of direct current power carrier wave, and namely DC bus 3 is energy bus, provides the passage of direct current energy; Also be signal bus simultaneously, the passage of the signals such as communication, control is provided.Power line carrier, PLC utilizes power transmission line to carry out a kind of specific communication mode of voice or transfer of data as information transmitting medium.
In two-way DC/DC current transformer, the signal that DC/DC current transformer control circuit produces sends modulation circuit, signal coupling circuit 9 by carrier wave successively, is finally coupled on DC bus 3; And the signal of DC bus 3 is successively by signal coupling circuit 9, carrier wave receiving demodulation circuit, DC/DC current transformer control circuit is finally enable to receive signal from DC bus 3.Simultaneously DC/DC current transformer control circuit communicates mutually with bottom layer driving circuit, goes to control the opening of each Hot-Plug Power switch 10, turns off, and acceptance is from the protection of bottom, observing and controlling information.Two-way DC/AC power converter 4 adopts similar communication and control mode.
Owing to present invention eliminates the control connection line between the two-way DC/DC current transformer 2 of each parallel connection in system, make system be more prone to adopt various control strategy, realize the cooperation control of whole system and the current-sharing of two-way DC/DC current transformer 2.Such as can the control strategy of master slave mode, namely two-way DC/AC power converter 4 is master unit, specifies the voltage of DC bus 3; Each two-way DC/DC current transformer 2 is from unit, the voltage distribution electric current of specifying according to master unit.
As shown in fig. 4 a, for two-way DC/DC current transformer heat inserts flow process: two-way DC/DC current transformer inserts and starts hot insertion program, DC/DC current transformer adjustment output voltage is until Hot-Plug Power switch ends voltage difference is less than given voltage threshold value U Δ, now Hot-Plug Power switch closes merga pass communication and realizes current-sharing, finally completes heat and inserts.
As shown in Figure 4 b, for the hot drawing of two-way DC/DC current transformer goes out flow process: start hot drawing and go out program, DC/DC current transformer adjustment output current (also namely flowing through the electric current of Hot-Plug Power switch) extracted in advance is until be less than specified current flow threshold value I Δ, now disconnect Hot-Plug Power switch make all the other DC/DC current transformer communications realize current-sharing, finally extract DC/DC current transformer and realize hot drawing and go out.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (8)
1., for a hot swap type converter system for new forms of energy and energy-storage system, it is characterized in that, comprise DC power supply, two-way DC/DC current transformer, DC bus, two-way DC/AC power converter, grid-connected switch;
Wherein the two ends of two-way DC/DC current transformer are connected with DC power supply, DC bus respectively, and one end of two-way DC/AC power converter is connected with DC bus, and the other end is connected on electrical network by grid-connected switch;
The energy of storage is transformed to the direct current energy of voltage identical with DC bus by DC power supply by two-way DC/DC current transformer, be transported on DC bus; Electric energy on DC bus is AC energy by the inversion of two-way DC/AC power converter again, is transported on electrical network; Or the electric energy on electrical network becomes direct current energy by the rectification of two-way DC/AC power converter and is transported to DC bus, then charged to DC power supply by two-way DC/DC current transformer, store energy in DC power supply;
Described two-way DC/DC current transformer comprises: two-way DC/DC convertor circuit, electric current, circuit for testing voltage, signal coupling circuit, Hot-Plug Power switch, DC/DC converter control system; Wherein, two-way DC/DC convertor circuit input is connected with DC power supply, and output is connected with electric current, circuit for testing voltage, communicates mutually with DC/DC converter control system simultaneously, and the order accepting DC/DC converter control system controls Hot-Plug Power switch; The input of electric current, circuit for testing voltage is connected with two-way DC/DC convertor circuit, and output is connected with signal coupling circuit by Hot-Plug Power switch, uploads electric current, voltage test signal to DC/DC converter control system simultaneously; Signal coupling circuit input is connected with electric current, circuit for testing voltage by Hot-Plug Power switch, and output is connected with DC bus, communicates mutually with DC/DC converter control system simultaneously.
2. the hot swap type converter system for new forms of energy and energy-storage system according to claim 1, it is characterized in that, described two-way DC/DC current transformer is one or more, and all two-way DC/DC current transformers are connected on DC bus by form in parallel.
3. the hot swap type converter system for new forms of energy and energy-storage system according to claim 2, it is characterized in that, between two-way DC/DC current transformer, and communicated by the mode of the direct current carrier without interconnection line between two-way DC/DC current transformer and two-way DC/AC power converter, realize the two-way current-sharing of DC/DC current transformer and the cooperation control of whole system.
4. the hot swap type converter system for new forms of energy and energy-storage system according to claim 1, it is characterized in that, the inversion of two-way DC/AC power converter is the output of AC energy is single-phase or three-phase electricity.
5. the hot swap type converter system for new forms of energy and energy-storage system according to claim 1, it is characterized in that, the step that heat inserts two-way DC/DC current transformer is: two-way DC/DC current transformer inserts and starts hot insertion program, the two-way DC/DC current transformer adjustment output voltage inserted, until described Hot-Plug Power switch ends voltage difference is less than given voltage threshold value U Δ, now described Hot-Plug Power switch closes merga pass communication and realizes current-sharing, finally completes heat and inserts.
6. the hot swap type converter system for new forms of energy and energy-storage system according to claim 1, it is characterized in that, the step that any one hot drawing in multiple two-way DC/DC current transformer side by side goes out is: start hot drawing and go out program, the electric current of described Hot-Plug Power switch is flow through in this two-way DC/DC current transformer adjustment of extracting in advance, until be less than specified current flow threshold value I Δ, now disconnect described Hot-Plug Power switch and make all the other DC/DC current transformer communications realize current-sharing, finally extracting DC/DC current transformer.
7. the hot swap type converter system for new forms of energy and energy-storage system according to claim 1, it is characterized in that, described DC power supply is array or solar panel.
8. the hot swap type converter system for new forms of energy and energy-storage system according to claim 1, it is characterized in that, described DC power supply is DC energy storage unit, and described DC energy storage unit is array, batteries, lithium battery group, bank of super capacitors or flying wheel battery.
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