CN104734179A - Ternary converter system based on distributed power generation system - Google Patents
Ternary converter system based on distributed power generation system Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The invention discloses a ternary converter system based on a distributed power generation system. Wherein, this system includes: the distributed power generation system, the load system, the power grid system, the converter device and the controller are respectively connected with the distributed power generation system, the load system and the power grid system; the current conversion device includes: the inverter is connected with the rectification inverter through a first group of direct current buses; the distributed power generation system is connected with the converter device through a second group of direct current buses, and the first group of direct current buses and the second group of direct current buses are connected in parallel; the controller controls the connection states of the distributed power generation system, the load system and the power grid system and the converter device respectively, and the connection states comprise connection or disconnection. The invention can realize flexible control of the multi-terminal direct current system.
Description
Technical field
The present invention relates to power electronics and household appliance technical field, in particular to a kind of ternary commutation system based on distributed generation system.
Background technology
Along with upsurge, the development rapidly that the regenerative resource interconnection technologies such as photovoltaic generation obtain and application that regenerative resource develops.The scheme being widely used in photovoltaic energy feedback grid system is at present: first convert solar energy into electrical energy, then electric energy is converted to by DC/DC converter and meets the direct voltage that DC/AC converter carries out pulse-width modulation or space vector pulse width modulation, finally by DC/AC converter, photovoltaic energy is fed back to AC network.Load electricity consumption is then after photovoltaic energy imports network system, and carrying out scheduling by network system unification provides.
According to the difference of load power taking point, collimation stream interconnection technology is also comparatively fast developed in recent years, as the connect-in strategy of Sanyo, the brand such as beautiful.Its energy-feedback power grid mode of collimation stream interconnection technology is identical with the grid-connected feedback mechanisms of conventional AC, and its difference is only load electricity consumption directly from the direct current power taking after DC/DC converter, then carries out load control by other change of current measures.
Exchanging in grid-connected system or collimating in stream grid-connected system, topmost link is exactly inverter (DC/AC converter), and what it adopted is SPWM inversion transformation technique or SVPWM inversion transformation technique.In theory and practice, the program can meet the requirement of photovoltaic energy feedback grid system, and ensure the two-way flow of the stable of electrical network and energy, but because program circuit is complicated, control loaded down with trivial details, and by the HF switch conversion of two-stage or more, cause larger energy loss, reduce the efficiency of parallel network reverse device.
Full direct current interconnection technology is then the DC bus direct current that photovoltaic module exports being directly incorporated into frequency converter, carry out drived control and the electrical network feedback of load, utilize novel trend Prediction and Control Technology and flexible direct current power transmission and distribution technology to realize the two-way flow of direct current energy simultaneously.
But the realization of above-mentioned full direct current interconnection technology, is difficult to the two-way flow commutation controlling DC energy; And the active ac electrical network that current conversion station needs access to have enough capacities of short circuit realizes; In addition, current conversion station needs to absorb a large amount of reactive powers, needs filtering and the reactive power compensator of larger capacity; Trend is oppositely difficult, is unfavorable for building MTDC transmission system flexibly.
The current full direct current interconnection technology for correlation technique cannot realize the problem of the flexible control of MTDC transmission system, not yet proposes effective solution at present.
Summary of the invention
Full direct current interconnection technology for correlation technique cannot realize the problem of the flexible control of MTDC transmission system, at present effective solution is not yet proposed, for this reason, main purpose of the present invention is to provide a kind of ternary commutation system based on distributed generation system, to solve the problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of ternary commutation system based on distributed generation system, this system comprises: distributed generation system, load system, network system, the current converter be connected with distributed generation system, load system and network system respectively and controller; Current converter comprises: inverter and commutation inversion device, and inverter is connected with commutation inversion device by first group of DC bus; Distributed generation system is connected with current converter by second group of DC bus, and first group of DC bus and second group of DC bus are connected in parallel; Wherein, controller control distributed generation system, load system and network system separately with the connection status of current converter, connection status comprises and being communicated with or shutoff.
By the present invention, adopt distributed generation system, load system, network system, the current converter be connected with distributed generation system, load system and network system respectively and controller; Current converter comprises: inverter and commutation inversion device, and inverter is connected with commutation inversion device by first group of DC bus; Distributed generation system is connected with current converter by second group of DC bus, and first group of DC bus and second group of DC bus are connected in parallel; Wherein, controller controls distributed generation system, load system and network system separately and the connection status of current converter, connection status comprises and is communicated with or turns off, the full direct current interconnection technology solving related art cannot realize the problem of the flexible control of MTDC transmission system, and then realizes the effect that can realize the flexible control of MTDC transmission system.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the ternary commutation system based on distributed generation system according to the embodiment of the present invention;
Fig. 2 is the structural representation according to commutation inversion device embodiment illustrated in fig. 1;
Fig. 3 is the structural representation of the first the preferred ternary commutation system according to the embodiment of the present invention;
Fig. 4 is the structural representation according to the preferred ternary commutation system of the second of the embodiment of the present invention;
Fig. 5 is the structural representation of the third the preferred ternary commutation system according to the embodiment of the present invention;
Fig. 6 is the structural representation of the 4th kind of preferred ternary commutation system according to the embodiment of the present invention;
Fig. 7 is the structural representation of the 5th kind of preferred ternary commutation system according to the embodiment of the present invention;
Fig. 8 is the structural representation of the preferred ternary commutation system of support multiterminal element according to the embodiment of the present invention;
Fig. 9 realizes the control of load system and the electric power-feeding structure schematic diagram of associated detection cell according to two DC buss of the embodiment of the present invention; And
Figure 10 is the direct current transmission and distribution control method schematic flow sheet realized according to trend prediction and the flexible direct current electrical power trans mission/distribution system of the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
In the configuration that it is the most basic, Fig. 1 is the structural representation of the ternary commutation system based on distributed generation system according to the embodiment of the present invention.
As shown in Figure 1, can should comprise based on the ternary commutation system of distributed generation system: distributed generation system 10, load system 30, network system 50, the current converter 70 be connected with distributed generation system, load system and network system respectively and controller 90.
Wherein, current converter 70 can comprise: inverter 701 and commutation inversion device 702, and inverter 701 is connected with commutation inversion device 702 by first group of DC bus; Distributed generation system 10 is connected 70 by second group of DC bus with current converter, and first group of DC bus and second group of DC bus are connected in parallel; Wherein, controller 90 control distributed generation system 10, load system 30 and network system 50 separately with the connection status of current converter 70, connection status comprises and being communicated with or shutoff.
The above embodiments of the present application establish distributed generation system, load is (including but not limited to determining frequency, frequency conversion load) ternary change of current model between system and utility network system three, achieve the full direct current interconnection technology that electric energy mixes in DC side two-way flow multichannel, during system load flow upset, namely system capacity overturns, be negative energy by positive energy upset or be converted in the process of power supply by power consumption, direct current reverse transfer, and DC voltage polarity remains unchanged, being conducive to forming to facilitate load disturbance to have again the MTDC transmission system in parallel of higher reliability.Thus the full direct current interconnection technology solving related art cannot realize the problem of the flexible control of MTDC transmission system, and then realize the effect that can realize the flexible control of MTDC transmission system.
Concrete, above-mentioned ternary commutation system can (load variable frequency centrifuge group rated power be for 380Kw with the grid-connected system of photovoltaic hair electricity one, photovoltaic generating system nominal power 400Kw) be example, the above-mentioned ternary commutation system of the application can comprise: distributed generation system, load system and network system ternary.
Preferably, the active power that can define network system input is the negative sense active power that it exports, then the active power sum that the active power of network system output and distributed generation system export equals the active power that load system consumes.
Preferably, as shown in Figure 2, the commutation inversion device 702 in the above embodiments of the present application can comprise: full control converter bridge 4, DC bus capacitor device 5(such as electrical network), converter reactor 1 and alternating current filter 2.Can also comprise: DC transmission line 3 and impedance 6.
Wherein, entirely controlling converter bridge, comprise the topological structure adopting three-phase two level, and each brachium pontis forming by IGBT, for direct current and alternating current mutually being changed.
DC bus capacitor device, and entirely control converter bridge and is connected in parallel, for providing voltage support for entirely controlling converter bridge and cushion impulse current, reduction DC side harmonics when brachium pontis turns off.
Converter reactor, and entirely controls converter bridge and is communicated with, for carrying out filtering process to the electric current of DC side.
Alternating current filter, is connected in parallel with converter reactor, for the harmonic wave of filtering AC.
Concrete, the commutation inversion device 702 in the above embodiments of the present application can be converter, and the critical piece of this converter can comprise: entirely control converter bridge, DC bus capacitor device, converter reactor (or AC converter transformer) and alternating current filter.Wherein entirely control the topological structure that converter bridge adopts three-phase two level, each brachium pontis forms by IGBT, and DC bus capacitor device provides voltage support for converter and cushions impulse current, reduction DC side harmonics when brachium pontis turns off; Converter reactor is and the tie of energy exchange between AC system, plays filter action simultaneously; The effect of wave filter on AC side is then filtering AC harmonic wave.
As illustrated in fig. 1 and 2, the trend prediction that the application provides and the main structure figure of flexible direct current electrical power trans mission/distribution system, identical with airborne converter (as the selected four-quadrant frequency converter) topology in above-mentioned photovoltaic hair electricity one grid-connected system, can directly share.
Preferably, in the above embodiments of the present application, by controlling the pulse signal of commutation inversion device, fundamental component amplitude and the phase place of commutation inversion device output voltage can be regulated.Novel trend PREDICTIVE CONTROL and flexible direct current power transmission and distribution technology can be adopted to carry out independent control to active power and reactive power, realize four quadrant running, have and control flexible advantage, its hardware circuit can share with frequency converter four-quadrant converter, thus can level of integrated system be improved, simplied system structure.Above-mentioned flexible direct current power transmission and distribution technology VSC-HVDC(Voltage Source Converter-HVDC) core be trend prediction.
In above-described embodiment, the modulation system such as space vector pulse width modulation (SVPWM) or sinusoidal pulse width modulation (SPWM) can be adopted, the fundamental component amplitude of the output voltage of full control converter bridge and phase place are regulated, the control of reactive power can be carried out while to conveying active power controller.When system normal steady state runs, the common power of three-membered ring flow model must keep balance, namely the active power that electrical network exports equals distributed generation system and load system consumes active power sum (suppose that distributed generation system is negative sense load, it consumes self power output that active power equals negative sense).It can thus be appreciated that the active power of DC network must keep balance, the active power namely exporting DC network must equal the active power loss that active power that DC network exports adds converter bridge and DC network.If there is any difference, all will cause rising or the reduction of direct voltage, and the instability of DC bus will affect the stable operation of backend load system.Trend prediction and flexible direct current power transmission and distribution control to be then by various PWM debud mode, and the fundamental frequency amplitude of real-time regulation output voltage and phase place ensure the stable of DC bus, carry out the independent regulation of active reactive.
Concrete, voltage source converter model as shown in Figure 2, can comprise following processing method:
Wherein: composition graphs 2 is known, the corresponding parameter of subscript c refers to converter bridge AC signal, and the corresponding parameter of subscript s refers to power network signal; Wherein, X=ω L,
δ is power network signal voltage phase angle; P active power, Q reactive power.
Active power and the same U of reactive power everywhere in formula 1-formula 4 i.e. Fig. 2
cand the basic relational expression between δ; In formula, voltage quantities is line voltage, and power and variable is three phase power.From formula 1-formula 4, regulate U
csize and the flow direction of active power and reactive power can be controlled with δ.
U
cvalue again by DC bus-bar voltage U
ddetermine with M, suppose that the direct voltage utilance of adopted PWM modulation technology is 1, i.e., there is following relation 0≤M≤1:
For P
s, Q
sindependent regulation, decoupling zero can obtain:
Wherein:
Formula 8
Convert can obtain according to formula 5, formula 8:
Known accordingly, the maximum of parameter A, B is proportional to U
d, namely do not change system voltage U
stime, P
c, Q
sadjustable range be subject to U
drestriction.Can be obtained (A, B are the intermediate variable in order to draw duty ratio M) by formula 6, formula 7:
Can obtain according to above formula:
As from the foregoing, in conjunction with above-mentioned calculating embodiment, the trend prediction that the application provides and the direct current transmission and distribution control method that flexible direct current electrical power trans mission/distribution system realizes can be as shown in Figure 10.
Preferably, as shown in Figure 3, in the above embodiments of the present application, when controller control distributed generation system and current converter turn off, and network system is when being communicated with load system by current converter, commutation inversion device is operated in rectification mode, and the alternating current that network system produces is converted to direct current and flows to inverter, and is flow to load system after alternating current by the DC conversion of the conversion of network system by inverter.
Concrete, electricity generation system is negative sense load in a distributed manner, all energy unifications are undertaken being scheduling to example by network system, above mentioned embodiment provide the commutating mode of the first ternary change of current model, in this mode, overall load only comprises load system, and full control converter bridge is operated in rectification mode, and network system energy is converted to the DC bus-bar voltage of backend load demand for control by converter bridge; Carry out trend prediction and direct current transmission and distribution control by various PWM method, make network system energy by energy scheduling, conversion, realize the stable operation of backend load;
Preferably, as shown in Figure 4, in the above embodiments of the present application, when controller control load system and current converter turn off, and distributed generation system is when being communicated with network system with second group of DC bus by the first group of DC bus be connected in parallel, if distributed generation system is negative sense load, then commutation inversion device is operated in inverter mode, the direct current that distributed generation system produces is converted to alternating current and flows to network system.
Concrete, electricity generation system is negative sense load in a distributed manner, and all energy unifications are undertaken being scheduling to example by network system, above mentioned embodiment provide the commutating mode of the second ternary change of current model, in this mode, overall load is distributed generation system, as shown in Figure 4.Because of the load that distributed generation system is negative, now energy flows into network system by full control converter bridge, and full control converter bridge is operated in inverter mode.Trend prediction and direct current transmission and distribution control by PWM, make distributed generation system export energy and carry out synchronous by the output voltage fundamental frequency amplitude after full control converter bridge and phase place with network system.
Preferably, as shown in Figure 5, in the above embodiments of the present application, when controller control network system and current converter turn off, and distributed generation system is when being communicated with load system with second group of DC bus by the first group of DC bus be connected in parallel, commutation inversion device is cut off, and by inverter, the direct current that distributed generation system produces is converted to alternating current and flows to load system.
Preferably, in the above embodiments of the present application, when distributed generation system is negative sense load, the power of the DC bus system of first group of DC bus and second group of DC bus formation is zero.
Concrete, electricity generation system is negative sense load in a distributed manner, all energy unifications are undertaken being scheduling to example by network system, above mentioned embodiment provide the commutating mode of the third ternary change of current model, in this mode, overall load both comprised distributed generation system, comprise load system again, now think that the power of DC bus system is zero, according to trend prediction and flexible direct current power transmission and distribution technology, the energy of direct current system keeps dynamic equilibrium, now, converter bridge does not work, trend prediction and flexible direct current power transmission and distribution control pulse signals and block, now dispatching of power netwoks energy is zero, achieve certainly turning off of electric current.By realizing electric current from turning off, said system can be operated in passive inverter mode, does not need additional commutation voltage.
Preferably, as shown in Figure 6, in the above embodiments of the present application, controller control distributed generation system, load system and network system separately and the connection status of current converter be all connected state, when the power that distributed generation system provides is less than the power needed for load system, commutation inversion device is operated in rectification mode to dispatch the electric energy of network system, and the galvanic output energy supposition that the direct current that provided by distributed generation system and commutation inversion device are provided is transferred to load system.
Concrete, electricity generation system is negative sense load in a distributed manner, and all energy unifications are undertaken being scheduling to example by network system, above mentioned embodiment provide the commutating mode of the 4th kind of ternary change of current model, in this mode, overall load comprises distributed generation system and load system, as shown in Figure 6.Two kinds of load superpositions are in power consumption state, namely the power that distributed generation system provides is less than the power needed for load system, network system is needed to carry out energy scheduling, now entirely control converter bridge and be operated in rectification state, busbar voltage energy exports both energy by dispatching of power netwoks energy and distributed generation system and superposes, need the working pulse controlling full control converter bridge according to trend prediction and flexible direct current power transmission and distribution, the DC bus-bar voltage after both guarantees superposition is stablized and the balance of energy.
Above embodiments enable the electric energy scheduling that hair is electrical integrated, reach the maximum utilization of solar energy.
Preferably, as shown in Figure 7, in the above embodiments of the present application, controller control distributed generation system, load system and network system separately and the connection status of current converter be all connected state, when the power that distributed generation system provides is greater than the power needed for load system, commutation inversion device is operated in inverter mode, is provided by distributed generation system unnecessary direct current to feed back to network system by commutation inversion device.
Concrete, electricity generation system is negative sense load in a distributed manner, and all energy unifications are undertaken being scheduling to example by network system, above mentioned embodiment provide the commutating mode of the 5th kind of ternary change of current model, in this mode, overall load both comprised distributed generation system, comprised load system again; Be in back electrical energy state after two kinds of load superpositions, the power that namely distributed generation system provides is greater than the power needed for load system, and excess energy needs to feed back to network system by entirely controlling converter bridge.Now, full control converter bridge is operated in inverter mode, direct current energy electric current is reverse, and polarity of voltage remains unchanged, and the stable and full control converter bridge output voltage fundamental frequency amplitude of DC bus-bar voltage and phase place are then the target that trend is predicted and flexible direct current power transmission and distribution control with the synchronous of network system.
Above-described embodiment also achieves the electrical integrated electric energy scheduling of hair, reaches the maximum utilization of solar energy.
As from the foregoing, above-mentioned five kinds of patterns that the application provides together constitute this ternary change of current model, predicted by trend and flexible direct current power transmission and distribution technology, obtain the pulse signal controlling entirely to control unsteady flow bridge, thus reach the target controlling DC bus-bar voltage and output voltage fundamental frequency amplitude and phase place.
Preferably, as shown in fig. 3 to 7, in the above embodiments of the present application, distributed generation system 10 can comprise:
Solar battery array 101, for generation of array direct current.
Collector-shoe gear 103, is connected with solar battery array, for being confluxed in device by array direct current.
DC switchgear 105, is connected with collector-shoe gear, carries out distribution for the direct current after being confluxed by collector-shoe gear, is transmitted by the main flow electricity after distribution by first group of DC bus.
It should be noted that, the distributed generation system in the above embodiments of the present application can be photovoltaic generating system, distributed wind-power generator system, wind light mutual complementing power generation formula system or fuel cell generation herein.Current converter can be arranged on air-conditioner set, such as, in load, thus can become airborne current converter.
In the said system that the application provides, have employed novel trend Prediction and Control Technology and flexible direct current power transmission and distribution technology, initiate the full direct current cutting-in control technology that electric energy closes in DC side two-way flow multichannel very much, establish distributed generation system, ternary change of current model between centrifuge load and utility network three, realize the electrical integrated electric energy scheduling of hair, reach the maximum using of solar energy.According to principle and the realization of trend PREDICTIVE CONTROL and flexible direct current power transmission and distribution technology, the Real-Time Scheduling of the electric energy in whole service process can be carried out according to load predictions different under the different working modes of this grid-connected system and energy ezpenditure.
In view of the application of trend PREDICTIVE CONTROL and flexible direct current power transmission and distribution technology, the full direct current grid-connected system of this photovoltaic supports MTDC transmission system, can realize DC bus sharing system or two DC bus and many DC bus system as shown in Figure 8, Figure 9.Namely two DC bus shown in Fig. 9 is adopted to realize the control of load system and the power supply of associated detection cell in native system.
From above description, can find out, present invention achieves following technique effect: the full direct current interconnection technology solving related art cannot realize the problem of the flexible control of MTDC transmission system, and then realize the effect that can realize the flexible control of MTDC transmission system.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the mode that the application can add required general hardware platform by software and realizes.Based on such understanding, the technical scheme of the application can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the application or embodiment.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for system embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
The application can be used in numerous general or special purpose computing system environment or configuration.Such as: personal computer, server computer, handheld device or portable set, laptop device, multicomputer system, system, set top box, programmable consumer-elcetronics devices, network PC, minicom, mainframe computer, the distributed computing environment (DCE) comprising above any system or equipment etc. based on microprocessor.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
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 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 (12)
1. the ternary commutation system based on distributed generation system, it is characterized in that, comprising: distributed generation system, load system, network system, the current converter be connected with described distributed generation system, load system and network system respectively and controller;
Described current converter comprises: inverter and commutation inversion device, and described inverter is connected with described commutation inversion device by first group of DC bus;
Described distributed generation system is connected with described current converter by second group of DC bus, and described first group of DC bus and described second group of DC bus are connected in parallel;
Wherein, described controller control described distributed generation system, load system and network system separately with the connection status of described current converter, described connection status comprises and is communicated with or turns off.
2. system according to claim 1, it is characterized in that, the active power defining the input of described network system is the negative sense active power that it exports, then the active power sum that the active power of described network system output and distributed generation system export equals the active power that load system consumes.
3. system according to claim 1, it is characterized in that, when described controller controls described distributed generation system and described current converter turns off, and described network system by described current converter be communicated with described load system time, described commutation inversion device is operated in rectification mode, the alternating current that described network system produces is converted to direct current and flows to described inverter, and be flow to described load system after alternating current by the DC conversion of the conversion of described network system by described inverter.
4. system according to claim 1, it is characterized in that, when described controller controls described load system and described current converter turns off, and described distributed generation system is when being communicated with described network system with described second group of DC bus by the described first group of DC bus be connected in parallel, if described distributed generation system is negative sense load, then described commutation inversion device is operated in inverter mode, the direct current that described distributed generation system produces is converted to alternating current and flows to described network system.
5. system according to claim 1, it is characterized in that, when described controller controls described network system and described current converter turns off, and described distributed generation system is when being communicated with described load system with described second group of DC bus by the described first group of DC bus be connected in parallel, described commutation inversion device is cut off, and by described inverter, the direct current that described distributed generation system produces is converted to alternating current and flows to described load system.
6. system according to claim 5, is characterized in that, when described distributed generation system is negative sense load, the power of the DC bus system that described first group of DC bus and described second group of DC bus are formed is zero.
7. system according to claim 1, it is characterized in that, it is all connected state with the connection status of described current converter separately that described controller controls described distributed generation system, load system and network system, when the power that described distributed generation system provides is less than the power needed for described load system, described commutation inversion device is operated in the electric energy that rectification mode carrys out execution cost network system, and the galvanic output energy supposition that the direct current that provided by described distributed generation system and described commutation inversion device are provided is transferred to described load system.
8. system according to claim 1, it is characterized in that, it is all connected state with the connection status of described current converter separately that described controller controls described distributed generation system, load system and network system, when the power that described distributed generation system provides is greater than the power needed for described load system, described commutation inversion device is operated in inverter mode, is provided by described distributed generation system unnecessary direct current to feed back to described network system by described commutation inversion device.
9. according to the system in claim 1-8 described in any one, it is characterized in that, by controlling the pulse signal of described commutation inversion device, regulating fundamental component amplitude and the phase place of described commutation inversion device output voltage.
10., according to the system in claim 1-8 described in any one, described commutation inversion device comprises:
Full control converter bridge, comprise the topological structure adopting three-phase two level, and each brachium pontis forms by IGBT, for direct current and alternating current mutually being changed;
DC bus capacitor device, is connected in parallel with described full control converter bridge, for providing voltage support for described full control converter bridge and cushioning impulse current, reduction DC side harmonics when brachium pontis turns off;
Converter reactor, and entirely controls converter bridge and is communicated with, for carrying out filtering process to the electric current of described DC side;
Alternating current filter, is connected in parallel with described converter reactor, for the harmonic wave of AC described in filtering.
11., according to the system in claim 1-8 described in any one, is characterized in that, described distributed generation system is photovoltaic generating system, distributed wind-power generator system, wind light mutual complementing power generation formula system or fuel cell generation.
12. systems according to claim 11, is characterized in that, described photovoltaic generating system comprises,
Solar battery array, for generation of array direct current;
Collector-shoe gear, is connected with described solar battery array, for being confluxed in device by described array direct current;
DC switchgear, is connected with described collector-shoe gear, carries out distribution for the direct current after being confluxed by described collector-shoe gear, is transmitted by the main flow electricity after distribution by described first group of DC bus.
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