CN105391079A - Power transfer type balanced power supply system and method based on new energy interconnection - Google Patents
Power transfer type balanced power supply system and method based on new energy interconnection Download PDFInfo
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Abstract
The invention discloses a power transfer type balanced power supply system based on new energy interconnection, which comprises a power adjuster, an AC/DC bidirectional isolation converter and a new energy power supply system, wherein the power adjuster comprises two voltage source converters and a DC capacitor, the two voltage source converters are connected with an external power grid, both ends of the DC capacitor are connected with the new energy power supply system through the AC/DC bidirectional isolation converter, and the AC/DC bidirectional isolation converter is used for achieving energy flow between the DC capacitor and the new energy power supply system. The invention further discloses a power transfer type balanced power supply method based on new energy interconnection, which comprises three operating modes including a charging operating mode, a power supply operating mode and a feeding operating mode. The power supply system and the power supply method have the advantages of achieving successful energy flow between the new energy power supply system and the DC capacitor, guaranteeing efficient utilization of energy, increasing voltage stabilization and frequency modulation capabilities of the new energy power supply system, improving electric energy quality, maintaining system stability and the like.
Description
Technical field
The present invention relates generally to technical field of new energies, refers in particular to a kind of power circulation type balanced feeding system and method based on new forms of energy interconnection.
Background technology
Along with the day of fossil fuel resource is becoming tight, people require more and more stronger to the application of regenerative resource, current operational new forms of energy (as wind energy, solar energy etc.) are progressively applied to existing electrical network, but the features such as the generation of electricity by new energy such as wind-powered electricity generation, solar energy self intrinsic intermittence, discontinuity and unsteadiness, cannot continue to use or generate electricity by way of merging two or more grid systems after making a large amount of wind-powered electricity generations, photovoltaic facility install.In addition, due to the unsteadiness of new forms of energy itself, make it create a lot of harmful effect to conventional electrical distribution net, comprise and make circuit pressure regulation, reactive power compensation complicated; Relaying protection type selecting and configuration difficulty; Grid short circuit capacity increases; The quality of power supply is disturbed; Accept power system dispatching difficulty, the extensive development of new forms of energy and popularization are restricted.Existing new energy system adopts lead acid accumulator energy storage mostly in addition, and there is environmental pollution, cyclicity is poor, increases investment and maintenance cost; And existing energy interconnection is only limitted to the internal energy flowing between generation of electricity by new energy device and energy-storage units, be confined to traditional energy network, conversion rate is lower.
Summary of the invention
The technical problem to be solved in the present invention is just: the technical problem existed for prior art, the invention provides one and realize energy flow between new energy system and external power grid, make full use of new energy system and fully ensure the power circulation type balanced feeding system based on new forms of energy interconnection of new energy system reliability service, and correspondingly providing a kind of power circulation type balanced feeding method based on new forms of energy interconnection easy and simple to handle.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is:
A kind of power circulation type balanced feeding system based on new forms of energy interconnection, comprise power governor, the two-way isolated converter of AC/DC and new energy system, described power governor comprises two voltage source converters and a DC capacitor, described DC capacitor is in parallel with two voltage source converters, two voltage source converters are connected with external power grid, the two ends of described DC capacitor are connected with described new energy system by the two-way isolated converter of AC/DC, the two-way isolated converter of described AC/DC is for realizing the energy flow between DC capacitor and new energy system, the two-way isolated converter of described AC/DC comprises the full-bridge circuit H1, full-bridge circuit H2 and the full-bridge circuit H3 that are connected successively, described full-bridge circuit H1 is used for realizing rectification or invert function, and described full-bridge circuit H2 and full-bridge circuit H3 combination is used for realizing DC/DC mapping function.
Further improvement as technique scheme:
Described full-bridge circuit H1, full-bridge circuit H2 and the H-bridge circuit of full-bridge circuit H3 all for being made up of four IGBT module.
Described full-bridge circuit H2 is connected by isolating transformer with between full-bridge circuit H3.
Two voltage source converters are all connected external power grid by out put reactor with single-phase multi winding transformer.
Energy flow between described external power grid and new power electric power system comprises three kinds of mode of operations: charge mode, described new energy system is charged to described DC capacitor, and now the two-way isolated converter of described AC/DC is in AC/DC/DC operating state and full-bridge circuit H1 is in rectification state; Powered operation pattern, described DC capacitor is to the load supplying of new energy system, and now the two-way isolated converter of described AC/DC is in DC/DC/AC operating state and full-bridge circuit H1 is in passive inverter state; Feed mode of operation, described DC capacitor is to the electrical network feed of new energy system, and now the two-way isolated converter of described AC/DC is in DC/DC/AC operating state and full-bridge circuit H1 is in active inversion state.
Described new energy system comprises powered by wind energy system or solar electric power supply system.
The invention also discloses a kind of method of supplying power to based on the power circulation type balanced feeding system based on new forms of energy interconnection as above, comprise three kinds of mode of operations:
Charge mode: when the grid power of new energy system is greater than the load of new energy system, described new energy system alternating current becomes high voltage direct current through the two-way isolated converter AC/DC conversion of AC/DC, then is charged to DC capacitor by low-voltage DC through forward DC/DC conversion;
Powered operation pattern: when new energy system exception, the low-voltage DC of described DC capacitor converts high voltage direct current to through the two-way isolated converter DC/DC of DC/DC, convert High Level AC Voltage to through reverse DC/AC again, directly supply the load of new energy system;
Feed mode of operation: when the grid power of new energy system is not enough, the low-voltage direct of described DC capacitor converts high voltage direct current to through the DC/DC of the two-way isolated converter of AC/DC, convert the alternating current with the line voltage constant amplitude of new energy system, same homophase frequently to through reverse DC/AC again, be fed back to the electrical network of new energy system.
Further improvement as technique scheme:
When being in charge mode, when the voltage of described DC capacitor is higher than predeterminated voltage, described DC capacitor discharges electric energy to external power grid; When being in powered operation pattern or feed mode of operation, when the voltage of described DC capacitor is lower than predeterminated voltage, described external power grid charges to DC capacitor.
When being in charge mode, full-bridge circuit H1 in the two-way isolated converter of described AC/DC is in rectification state, for High Level AC Voltage is rectified into high voltage direct current, described full-bridge circuit H2 and full-bridge circuit H3 is in forward DC/DC transition status, for converting high voltage direct current to low-voltage DC.
When being in powered operation pattern, full-bridge circuit H2 in the two-way isolated converter of described AC/DC and full-bridge circuit H3 is in reverse DC/DC transition status, for converting low-voltage DC to high voltage direct current, described full-bridge circuit H1 is in passive inverter state, for converting high voltage direct current to High Level AC Voltage.
When being in feed mode of operation, full-bridge circuit H2 in the two-way isolated converter of described AC/DC and full-bridge circuit H3 is in reverse DC/DC transition status, for converting low-voltage DC to high voltage direct current, described full-bridge circuit H1 is in active inversion state, for high voltage direct current being converted to the alternating current with the line voltage constant amplitude of new energy system, same homophase frequently.
Compared with prior art, the invention has the advantages that:
Power circulation type balanced feeding system based on new forms of energy interconnection of the present invention, the energy that can realize between new energy system and external power grid interconnects and shares, both can by the unnecessary electric energy feed-in external power grid of new energy system for other user, when new energy system electrical network electric energy is not enough again by DC capacitor from the real-time electric energy supplement of external power grid, continue the load supplying to new energy system; The two-way isolated converter of AC/DC can by new energy system and external power grid mutually isolated, reduce the interference of surge voltage to external power grid of new energy system; When there being fault to occur, can two-way flow between the fast shut-off energy.Power circulation type balanced feeding method based on new forms of energy interconnection of the present invention, not only there is the advantage as above described in system, and when new energy system voltage fall, shove and instantaneous power failure time, DC capacitor energy storage can play cushioning effect, supplement not enough electricity, improve the quality of power supply, maintain system stability; When new energy system grid power declines, to new energy network feeder, electrical network pressure can be alleviated by DC capacitor, improve grid power.
Accompanying drawing explanation
Fig. 1 is the structural representation of electric power system of the present invention.
Fig. 2 is the circuit theory diagrams of the two-way isolated converter of AC/DC in electric power system of the present invention.
Fig. 3 is the energy flow graph of electric power system of the present invention when being in charge mode.
Fig. 4 is the energy flow graph of electric power system of the present invention when being in powered operation pattern.
Fig. 5 is the energy flow graph of electric power system of the present invention when being in feed mode of operation.
Fig. 6 is the controlling party block diagram of method of supplying power to of the present invention full-bridge circuit H1 under charge mode.
Fig. 7 is the controlling party block diagram of method of supplying power to of the present invention full-bridge circuit H2 and H3 under charge mode.
Fig. 8 is the controlling party block diagram of method of supplying power to of the present invention full-bridge circuit H1 under powered operation pattern.
Fig. 9 is the controlling party block diagram of method of supplying power to of the present invention full-bridge circuit H2 and H3 under powered operation pattern.
Figure 10 is the controlling party block diagram of method of supplying power to of the present invention full-bridge circuit H1 under feed mode of operation.
Figure 11 is the controlling party block diagram of method of supplying power to of the present invention full-bridge circuit H2 and H3 under feed mode of operation.
Embodiment
Below in conjunction with Figure of description and specific embodiment, the invention will be further described.
As shown in Figures 1 to 5, the power circulation type balanced feeding system based on new forms of energy interconnection of the present embodiment, comprise power governor, the two-way isolated converter of AC/DC and new energy system, power governor comprises two voltage source converters and a DC capacitor, DC capacitor is in parallel with two voltage source converters, two voltage source converters are connected with external power grid, the two ends of DC capacitor are connected with new energy system by the two-way isolated converter of AC/DC, the two-way isolated converter of AC/DC is for realizing the energy flow between DC capacitor and new energy system, the two-way isolated converter of AC/DC comprises the full-bridge circuit H1, full-bridge circuit H2 and the full-bridge circuit H3 that are connected successively, and full-bridge circuit H1 is used for realizing rectification or invert function, and full-bridge circuit H2 and full-bridge circuit H3 combination is used for realizing DC/DC mapping function.Power circulation type balanced feeding system based on new forms of energy interconnection of the present invention, the energy that can realize between new energy system and external power grid interconnects and shares, both can by the unnecessary electric energy feed-in external power grid of new energy system for other user, when new energy system electrical network electric energy is not enough again by DC capacitor from the real-time electric energy supplement of external power grid, continue the load supplying to new energy system; The two-way isolated converter of AC/DC can by new energy system and external power grid mutually isolated, reduce the interference of surge voltage to external power grid of new energy system; When there being fault to occur, can two-way flow between the fast shut-off energy; Realize the efficiency utilization of energy in addition, effectively raise the voltage stabilizing fm capacity of new energy system electrical network, drag down grid power peak-valley difference, improve the quality of power supply, maintain system stability.When new energy system voltage fall, shove and instantaneous power failure time, DC capacitor energy storage can play cushioning effect, supplement not enough electricity, improve the quality of power supply, maintain system stability; When new energy system grid power declines, to new energy network feeder, electrical network pressure can be alleviated by DC capacitor, improve grid power.
As shown in Figure 2, in the present embodiment, full-bridge circuit H1, full-bridge circuit H2 and the H-bridge circuit of full-bridge circuit H3 all for being made up of four IGBT module, lead regulation output voltage by control IGBT, also comprises frequency inductance Ls in addition, high-frequency inductor Lt, electric capacity C1, C2, C3 and high-frequency isolation transformer T, wherein frequency inductance Ls plays energy storage effect in the process of rectification, strobes in reversals, high-frequency inductor Lt, in the two-way DC/DC course of work, plays the effect of transferring energy; High-frequency isolation transformer T plays the effect of isolation and transferring energy, is made up of, has higher flexibility individual whole circuit full-bridge.In other embodiments, also can select other different power cell device, thus form the device of different electric pressure and different capabilities.
In the present embodiment, two voltage source converters are all connected external power grid by out put reactor with single-phase multi winding transformer, connect external power grid by voltage source converter, and DC capacitor can realize the energy exchange with external power grid, as charged to DC capacitor, or DC capacitor is to external power grid feed.The two-way isolated converter of AC/DC adopts high frequency transformer, can by new energy system and external power grid mutually isolated, reduce the interference of surge voltage to external power grid of new energy system; When there being fault to occur, can the two-way flow of the fast shut-off energy.
In the present embodiment, energy flow between external power grid and new power electric power system comprises Three models: charge mode, as shown in Figure 3, new energy system is charged to DC capacitor, and now the two-way isolated converter of AC/DC is in AC/DC/DC operating state and full-bridge circuit H1 is in rectification state; Powered operation pattern, as shown in Figure 4, DC capacitor is to the load supplying of new energy system, and now the two-way isolated converter of AC/DC is in DC/DC/AC operating state and full-bridge circuit H1 is in passive inverter state; Feed mode of operation, as shown in Figure 5, DC capacitor is to the electrical network feed of new energy system, and now the two-way isolated converter of AC/DC is in DC/DC/AC operating state and full-bridge circuit H1 is in active inversion state.
In the present embodiment, new energy system comprises powered by wind energy system or solar electric power supply system or other energy resource system.
The method of supplying power to based on the power circulation type balanced feeding system based on new forms of energy interconnection as above of the present embodiment, comprises three kinds of mode of operations:
Charge mode: when the grid power of new energy system is greater than the load of new energy system, namely when new energy system can provide more than energy needed for load, new energy system alternating current becomes high voltage direct current through the AC/DC conversion of the two-way isolated converter of AC/DC, convert low-voltage DC to through forward DC/DC again to charge to DC capacitor, thus by unnecessary energy storage in DC capacitor, the two-way isolated converter of whole AC/DC is in AC/DC/DC operating state;
Powered operation pattern: when new energy system exception (during power-off as unexpected in new energy system electrical network), the low-voltage DC of DC capacitor converts high voltage direct current to through the DC/DC of the two-way isolated converter of DC/DC, High Level AC Voltage is converted to again through reverse DC/AC, the load of direct supply new energy system, the two-way isolated converter of whole AC/DC is in DC/DC/AC operating state;
Feed mode of operation: when the grid power of new energy system is not enough (as when night or wind-force more weak), new energy system cannot provide enough energy for load, now the low-voltage direct of DC capacitor converts high voltage direct current to through the DC/DC of the two-way isolated converter of AC/DC, the alternating current with the line voltage constant amplitude of new energy system, same homophase is frequently converted to again through reverse DC/AC, be fed back to the electrical network of new energy system, the two-way isolated converter of whole AC/DC is in DC/DC/AC operating state.
In the present embodiment, when being in charge mode, when the voltage of described DC capacitor is higher than predeterminated voltage, described DC capacitor discharges electric energy to external power grid; When being in powered operation pattern or feed mode of operation, when the voltage of described DC capacitor is lower than predeterminated voltage, described external power grid charges to DC capacitor.
In the present embodiment, when being in charge mode, full-bridge circuit H1 in the two-way isolated converter of AC/DC is in rectification state, for High Level AC Voltage is rectified into high voltage direct current, full-bridge circuit H2 and full-bridge circuit H3 is in forward DC/DC transition status, for converting high voltage direct current to low-voltage DC, namely energy flows from new energy system to external power grid, its control procedure comprises two independently closed-loop control links, as shown in Figure 6 and Figure 7, be respectively AC/DC closed-loop control and DC/DC closed-loop control, achieve the uneoupled control of charging process, specific as follows:
A (), in AC/DC rectify control process, full-bridge circuit H1 is operated in controlled rectification state, need for forward DC/DC conversion provides DC bus-bar voltage, therefore controlled quentity controlled variable is DC bus-bar voltage U
dCwith electrical network input current i
s, with the electrical network input current i of converter
sfor inner ring, with DC bus-bar voltage U
dCfor outer shroud, form double closed-loop control system together.By U
dC actual valuewith U
dC reference valueside-play amount through PI regulate after, be multiplied by line voltage U
sphase place, as the reference value i of electrical network input current
s reference value, current i
s reference valuewith i
s actual valueside-play amount regulate through PI, add voltage U
sfeed-forward regulation SPWM ripple.In control procedure, because the input current phase time of electrical network follows the tracks of electric network voltage phase, and there is electric voltage feed forward link, have good dynamic property, achieve unit power factor rectifier, for bus provides galvanic current pressure.
B (), in forward DC/DC control procedure, full-bridge H2 and H3 is operated in forward DC/DC transition state, with DC capacitor charging current i
bfor inner ring and DC capacitor charging voltage U
bfor outer shroud forms double closed-loop control system.By charging voltage U
b actual valuewith U
b reference valuedeviation regulate through PI, be used as the reference value i of charging current
b reference value, by current i
b reference valuewith i
b actual valuedeviation after PI regulates, produce phase shifting angle φ control PWM ripple.In double-closed-loop control process, charging voltage is controlled, charge to DC capacitor with constant magnitude of voltage, also limit the size of charging current simultaneously, reduce the consumption of energy.
In the present embodiment, when being in powered operation pattern, full-bridge circuit H2 in the two-way isolated converter of AC/DC and full-bridge circuit H3 is in reverse DC/DC transition status, for converting low-voltage DC to high voltage direct current, full-bridge circuit H1 is in passive inverter state, for converting high voltage direct current to High Level AC Voltage, namely energy flows from external power grid to the load of new energy system.As shown in Figure 8 and Figure 9, whole power supply control process, equally by two independently closed-loop control links, is respectively DC/DC closed-loop control and DC/AC closed-loop control, achieves the uneoupled control of power supply process, specific as follows:
A (), in DC/AC passive inverter control procedure, full-bridge circuit H1 is operated in SPWM passive inverter state, controlled quentity controlled variable is converter output voltage U
oeffective value and phase place, be equally also double-closed-loop control.U
oand U
ormsbe respectively instantaneous voltage and effective value that two-way AC/DC converter exports when powering mode, by two-way AC/DC converter output voltage effective value U
orms actual valuewith U
orms reference valueside-play amount through PI regulate after, be multiplied by the reference value U that sinusoidal phase is used as output voltage instantaneous value
o reference value, by converter output voltage instantaneous value U
o actual valuewith U
o reference valuedeviation through PI regulate after, carry out control SPWM ripple.
B () is in reverse DC/DC control procedure, full-bridge circuit H2 and H3 is operated in reverse DC/DC transition state, due to will busbar voltage be provided for the passive inverter of full-bridge circuit H1 and realize stable output power, the discharging current of restriction DC capacitor, the controlled quentity controlled variable of therefore oppositely DC/DC conversion is DC bus-bar voltage U
dCwith RPC DC capacitor charging current i
b.By outer shroud DC bus-bar voltage U
dC actual valuewith U
dC reference valueside-play amount after PI regulates, it exports as the reference value i of DC capacitor discharging current
b reference value, by current i
b reference valuewith i
b actual valuedeviation after PI regulates, produce phase shifting angle control PWM ripple.
In the present embodiment, when being in feed mode of operation, full-bridge circuit H2 in the two-way isolated converter of AC/DC and full-bridge circuit H3 is in reverse DC/DC transition status, for converting low-voltage DC to high voltage direct current, full-bridge circuit H1 is in active inversion state, for high voltage direct current being converted to the line voltage constant amplitude with new energy system, with the alternating current of frequency homophase, namely energy is from external power grid to new energy system flow, as shown in Figure 10 and Figure 11, feed control procedure also comprises two independently closed-loop control links, be respectively DC/DC closed-loop control and DC/AC closed-loop control, achieve the uneoupled control of feed procedures.
A (), in DC/AC parallel network reverse control procedure, full-bridge circuit H1 is operated in SPWM active inversion state, because the output of converter is connected with electrical network, output voltage is identical with line voltage all the time, and therefore controlled quentity controlled variable is the grid-connected current i that converter exports
s.I
sand i
srmsbe respectively grid-connected current instantaneous value and the effective value of converter output, with grid-connected current instantaneous value for inner ring, its effective value is outer shroud, forms double closed-loop control system together.By grid-connected current effective value i
srms actual valueand i
srms reference valueside-play amount through PI regulate after, be multiplied by line voltage U
santiphase be used as the reference value i of current instantaneous value
s reference value, by grid-connected current instantaneous value i
s reference valueand i
s actual valueside-play amount through PI regulate after, carry out control SPWM ripple.Because power network current follows the antiphase of line voltage all the time, so electrical network can absorb active power from converter.
B under () feeding mode, full-bridge circuit H2 and H3 is operated in reverse DC/DC transition state, identical with DC/DC control strategy during powering mode, does not repeat them here.
Below be only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (11)
1. the power circulation type balanced feeding system based on new forms of energy interconnection, it is characterized in that, comprise power governor, the two-way isolated converter of AC/DC and new energy system, described power governor comprises two voltage source converters and a DC capacitor, described DC capacitor is in parallel with two voltage source converters, two voltage source converters are connected with external power grid, the two ends of described DC capacitor are connected with described new energy system by the two-way isolated converter of AC/DC, the two-way isolated converter of described AC/DC is for realizing the energy flow between DC capacitor and new energy system, the two-way isolated converter of described AC/DC comprises the full-bridge circuit H1, full-bridge circuit H2 and the full-bridge circuit H3 that are connected successively, described full-bridge circuit H1 is used for realizing rectification or invert function, and described full-bridge circuit H2 and full-bridge circuit H3 combination is used for realizing DC/DC mapping function.
2. the power circulation type balanced feeding system based on new forms of energy interconnection according to claim 1, is characterized in that, described full-bridge circuit H1, full-bridge circuit H2 and the H-bridge circuit of full-bridge circuit H3 all for being made up of four IGBT module.
3. the power circulation type balanced feeding system based on new forms of energy interconnection according to claim 2, it is characterized in that, described full-bridge circuit H2 is connected by isolating transformer with between full-bridge circuit H3.
4. the power circulation type balanced feeding system based on new forms of energy interconnection according to claim 1 or 2 or 3, it is characterized in that, two voltage source converters are all connected external power grid by out put reactor with single-phase multi winding transformer.
5. the power circulation type balanced feeding system based on new forms of energy interconnection according to claim 1 or 2 or 3, it is characterized in that, energy flow between described external power grid and new power electric power system comprises three kinds of mode of operations: charge mode, described new energy system is charged to described DC capacitor, and now the two-way isolated converter of described AC/DC is in AC/DC/DC operating state and full-bridge circuit H1 is in rectification state; Powered operation pattern, described DC capacitor is to the load supplying of new energy system, and now the two-way isolated converter of described AC/DC is in DC/DC/AC operating state and full-bridge circuit H1 is in passive inverter state; Feed mode of operation, described DC capacitor is to the electrical network feed of new energy system, and now the two-way isolated converter of described AC/DC is in DC/DC/AC operating state and full-bridge circuit H1 is in active inversion state.
6. the power circulation type balanced feeding system based on new forms of energy interconnection according to claim 1 or 2 or 3, it is characterized in that, described new energy system comprises powered by wind energy system or solar electric power supply system.
7., based on the method for supplying power to as the power circulation type balanced feeding system based on new forms of energy interconnection in claim 1 to 6 as described in any one, it is characterized in that, comprise three kinds of mode of operations:
Charge mode: when the grid power of new energy system is greater than the load of new energy system, described new energy system alternating current becomes high voltage direct current through the two-way isolated converter AC/DC conversion of AC/DC, then is charged to DC capacitor by low-voltage DC through forward DC/DC conversion;
Powered operation pattern: when new energy system exception, the low-voltage DC of described DC capacitor converts high voltage direct current to through the two-way isolated converter DC/DC of DC/DC, convert High Level AC Voltage to through reverse DC/AC again, directly supply the load of new energy system;
Feed mode of operation: when the grid power of new energy system is not enough, the low-voltage direct of described DC capacitor converts high voltage direct current to through the DC/DC of the two-way isolated converter of AC/DC, convert the alternating current with the line voltage constant amplitude of new energy system, same homophase frequently to through reverse DC/AC again, be fed back to the electrical network of new energy system.
8. the power circulation type balanced feeding method based on new forms of energy interconnection according to claim 7, it is characterized in that, when being in charge mode, when the voltage of described DC capacitor is higher than predeterminated voltage, described DC capacitor discharges electric energy to external power grid; When being in powered operation pattern or feed mode of operation, when the voltage of described DC capacitor is lower than predeterminated voltage, described external power grid charges to DC capacitor.
9. the power circulation type balanced feeding method based on new forms of energy interconnection according to claim 7 or 8, it is characterized in that, when being in charge mode, full-bridge circuit H1 in the two-way isolated converter of described AC/DC is in rectification state, for High Level AC Voltage is rectified into high voltage direct current, described full-bridge circuit H2 and full-bridge circuit H3 is in forward DC/DC transition status, for converting high voltage direct current to low-voltage DC.
10. the power circulation type balanced feeding method based on new forms of energy interconnection according to claim 9, it is characterized in that, when being in powered operation pattern, full-bridge circuit H2 in the two-way isolated converter of described AC/DC and full-bridge circuit H3 is in reverse DC/DC transition status, for converting low-voltage DC to high voltage direct current, described full-bridge circuit H1 is in passive inverter state, for converting high voltage direct current to High Level AC Voltage.
The 11. power circulation type balanced feeding methods based on new forms of energy interconnection according to claim 10, it is characterized in that, when being in feed mode of operation, full-bridge circuit H2 in the two-way isolated converter of described AC/DC and full-bridge circuit H3 is in reverse DC/DC transition status, for converting low-voltage DC to high voltage direct current, described full-bridge circuit H1 is in active inversion state, for high voltage direct current being converted to the alternating current with the line voltage constant amplitude of new energy system, same homophase frequently.
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| CN110121819A (en) * | 2017-01-05 | 2019-08-13 | 菲若艾姆普电子公司 | Local electric power network arrangements |
| WO2021169144A1 (en) * | 2020-02-29 | 2021-09-02 | 贵州电网有限责任公司 | Mgp new energy grid-connected control method and system |
| WO2022166524A1 (en) * | 2021-02-07 | 2022-08-11 | 中车青岛四方机车车辆股份有限公司 | Battery charging control method and system, vehicle, readable storage medium, and device |
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| CN110121819A (en) * | 2017-01-05 | 2019-08-13 | 菲若艾姆普电子公司 | Local electric power network arrangements |
| CN110121819B (en) * | 2017-01-05 | 2024-03-08 | 菲若艾姆普电子公司 | Local power grid arrangement |
| CN109428330A (en) * | 2017-08-24 | 2019-03-05 | 株洲变流技术国家工程研究中心有限公司 | Electric railway auxiliary power supply system and control method with power circulation function |
| CN109980951A (en) * | 2019-05-08 | 2019-07-05 | 山东华特磁电科技股份有限公司 | Double PWM variable-frequency power sources energy balance devices and method |
| WO2021169144A1 (en) * | 2020-02-29 | 2021-09-02 | 贵州电网有限责任公司 | Mgp new energy grid-connected control method and system |
| WO2022166524A1 (en) * | 2021-02-07 | 2022-08-11 | 中车青岛四方机车车辆股份有限公司 | Battery charging control method and system, vehicle, readable storage medium, and device |
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