CN109149550B - Method for realizing power distribution partition electric energy transmission by taking three-port converter as regulation node - Google Patents

Method for realizing power distribution partition electric energy transmission by taking three-port converter as regulation node Download PDF

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CN109149550B
CN109149550B CN201811017216.3A CN201811017216A CN109149550B CN 109149550 B CN109149550 B CN 109149550B CN 201811017216 A CN201811017216 A CN 201811017216A CN 109149550 B CN109149550 B CN 109149550B
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CN109149550A (en
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游江
廖梦岩
李晓旭
程连斌
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Harbin Engineering University
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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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements

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Abstract

The invention belongs to the field of power electronic technology research, and particularly relates to a method for realizing power distribution inter-partition power transmission by using a three-port converter as a regulation nodeAC、GBCAnd a voltage controller GA1、GA2、GA3、GB1、GB2、GB3Is 0, and the stable operation voltages of the direct current buses of the power distribution subareas A and B are respectively set as uANAnd uBNThe upper limit and the lower limit of the stable operation voltage of the direct current bus of the power distribution subarea C are respectively uHCAnd uLC(ii) a Respectively obtaining direct current bus voltage values u of three distribution subareas by using voltage sensors VSA, VSB and VSCA、uBAnd uC. The invention can realize free flexible transmission of power between the power distribution partitions, and ensures that the voltage of each power distribution partition is always in an allowable stable operation range in dynamic regulation and control through a control strategy, thereby obviously improving the performance of a power distribution system.

Description

Method for realizing power distribution partition electric energy transmission by taking three-port converter as regulation node
Technical Field
The invention belongs to the technical field of electric energy transmission, and particularly relates to a method for realizing power distribution partition electric energy transmission by taking a three-port converter as a regulation node.
Background
The traditional direct current power distribution system introduces the residual electric energy of an auxiliary power supply or a normal power distribution partition into a power distribution partition with a fault or insufficient power through switching of a manual or automatic switch so as to keep the continuous power supply capacity of the power distribution partition. The switching mode has the following disadvantages: strong electromagnetic transient processes may exist in the switching process; time delay exists in the switching process; the continuous controllable adjustment of electric energy cannot be realized, and the flexibility is lacked; switching can only exist between distribution busbars of the same voltage class. Therefore, a novel power distribution system electric energy regulation mechanism and strategy are designed from the aspects of improving the fault tolerance performance, the continuous power supply capacity and the reliability of the power distribution system, and flexible, quick and automatic transmission of electric energy among power distribution sub-regions is realized. This patent proposes the application scheme who regards three-port converter as power distribution system's power regulation and control node, can realize not tolerating the free flexible transmission of power between the distribution subregion to guaranteed through control strategy that the voltage of every distribution subregion is in the stable operating range of allowwing all the time in dynamic regulation and control, can show the performance that promotes power distribution system.
In summary, in the prior art, there are problems that a switching process may have a strong electromagnetic transient process, a switching process has a time delay, continuous and controllable adjustment of electric energy cannot be realized, flexibility is lacked, and switching can only exist between distribution buses of the same voltage class.
Disclosure of Invention
The invention aims to provide a method for realizing power distribution partition electric energy transmission by taking a three-port converter as a regulation node, which mainly contributes to and is characterized in that:
the method for realizing power distribution partition electric energy transmission by taking the three-port converter as a regulation node comprises the following steps:
(1) in the initial stage of system power-on, making initialization work of software and hardware related to system control, setting current controller GAC、GBCAnd a voltage controller GA1、GA2、GA3、GB1、GB2、GB3Is 0, and the stable operation voltages of the direct current buses of the power distribution subareas A and B are respectively set as uANAnd uBNThe upper limit and the lower limit of the stable operation voltage of the direct current bus of the power distribution subarea C are respectively uHCAnd uLC；
(2) Respectively obtaining direct current bus voltage values u of three distribution subareas by using voltage sensors VSA, VSB and VSCA、uBAnd uCComparing the voltage threshold value set in initialization with the voltage value collected by the sensor to obtain a deviation signal eVA1、eVA2、eVA3And eVB1、eVB3、eVB3Each deviation signal is input to a corresponding voltage controller GA1、GA2、GA3And GB1、GB1、GB3In the method, the signal output by each voltage controller is subjected to amplitude limiting to obtain iA1、iA2、iA3，iB1、iB1、iB3；
(3) Will signal iA2And iA3By taking small ring segments of min1(x, y) to obtain a signal iAmin(ii) a Will signal iB2And iB3By taking small ring segments of min2(x, y) to obtain a signal iBmin；
(4) Will signal iA1Sum signal iAminFeeding in and taking out large link max1(x, y) obtaining a current setting signal i by judgmentAR(ii) a Will signal iB1Sum signal iBminFeeding in and taking out large link max2(x, y) obtaining a current setting signal i by judgmentBR；
(5) Giving current to signal iARAnd iBRThe currents i of the two power distribution subareas are respectively obtained through the measurement of the current sensors CSA and CSBAAnd iBMaking a difference to obtain a deviation eCAAnd eCB(ii) a Deviation eCAAnd eCBRespectively input current controller GACAnd GBCCalculating to obtain the phase shift angle of the full-bridge converter A relative to the full-bridge converter C
Figure GDA0003048709520000021
And the phase shift angle of the full-bridge inverter B relative to the full-bridge inverter C
Figure GDA0003048709520000022
(6) Using the full-bridge converter C as a phase shift angle reference position to control the phase shift angle
Figure GDA0003048709520000023
The phase-shifted control signals are used as phase-shifted control signals of the full-bridge converter carriers A and B, and signals with the amplitude of one half of the carrier period are used as modulation signals for PWM modulation to obtain pulse signals for driving the switching tubes of the two full-bridge converters A and B;
(7) and (4) repeatedly executing the steps (2) to (6) under the condition that a stop instruction is not obtained, and otherwise, exiting the running state.
The duty ratio of all the switch tubes in the full-bridge converter A is 0.5, the upper switch tube and the lower switch tube of the same bridge arm are in a complementary conduction mode, the phase shift angle between the bridge arm A1 and the bridge arm A2 is fixed to be 180 degrees, and the full-bridge converters B and C have the same working mode as the full-bridge converter A.
The invention has the beneficial effects that:
the invention can realize free flexible transmission of power between the power distribution partitions, and ensures that the voltage of each power distribution partition is always in an allowable stable operation range in dynamic regulation and control through a control strategy, thereby obviously improving the performance of a power distribution system.
Drawings
FIG. 1 is a flow chart of the implementation of the present invention;
FIG. 2 is a schematic diagram of a three-isolated power distribution partition topology with a three-port converter as a regulation node;
FIG. 3 is a schematic diagram of a three-isolated power distribution zone control strategy using a three-port converter as a regulation node;
FIG. 4 is a DC bus voltage u for three distribution baysA、uBAnd uCA waveform diagram;
FIG. 5 is a waveform of the output power of distribution section A, B and C through a three-port converter;
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the invention provides a method for realizing power distribution partition electric energy transmission by using a three-port converter as a regulation node. Each port of the three-port converter is connected with an independent power distribution partition, the power transmission direction and the power transmission size among the three power distribution partitions are adjusted by controlling the three-port converter, and the voltage of the three power distribution partitions is maintained in the stable operation range of each power distribution partition. When any one power distribution partition is overloaded or fails, the power distribution partition with power redundancy transmits power to the power distribution partition under the condition of ensuring the self operation condition so as to maintain the normal operation of the three power distribution partitions. The control method provided by the patent enables power among three power distribution partitions to be automatically coordinated and transmitted, and improves the fault tolerance and reliability of the whole three-port power distribution system.
The method for realizing power distribution partition electric energy transmission by taking the three-port converter as a regulation node comprises the following steps:
(1) each port of the three-port converter is connected with a power distribution partition, and each power distribution partition is provided with an independent power supply and an independent load. When each power distribution subarea can stably run, electric energy cannot be transmitted among the three power distribution subareas through the three-port converter; when a certain power distribution partition is insufficient in power or has a fault, other power distribution partitions transmit redundant power to the power distribution partition with the insufficient power or the fault under the condition that the other power distribution partitions meet the stable operation of the other power distribution partitions.
(2) The three-port converter decoupled by hardware is used as an electric energy regulation and control node, and the three-port converter can be regarded as being composed of two double-active-bridge converters on a topological structure, so that the design of the whole control system can be simplified. And controlling the double-active-bridge converter connected with the distribution subarea A and the distribution subarea C, so that the power between the two distribution subareas can freely flow according to the requirement. The voltage ring is used as an outer ring, and the current ring is used as a double-ring control structure of an inner ring. Three control loops are arranged on the voltage outer ring, and the voltage control loop A1 controls the DC bus voltage u of the distribution partition CCAt the lowest voltage threshold uCLThe voltage control loop A2 controls the DC bus voltage u of the distribution area AAAt the lowest voltage threshold uCLThe voltage control loop A3 controls the DC bus voltage u of the distribution zone CCAt the highest voltage threshold uCH. The signals output by the three voltage outer loop controllers are all subjected to amplitude limiting, and given signals i of the three current inner loops are obtained through the calculation of the controllersA1、iA2And iA3. Will signal iA1、iA2And iA3And performing logic selection of large or small, and taking the selected result as a given signal of the current inner loop. The current i of the power distribution subarea A input to the full-bridge converter A by the current inner-loop controllerAAs a control object, pass throughCalculating to obtain the phase shift angle of the full-bridge converter A relative to the full-bridge converter C
Figure GDA0003048709520000031
The double-active-bridge converter connected with the distribution subarea B and the distribution subarea C has the same control structure and control method as the double-active-bridge converter connected with the distribution subarea A and the distribution subarea C.
Method for realizing power distribution partition electric energy transmission by taking three-port converter as regulation node
The invention belongs to the technical field of power electronics, and particularly relates to a method for realizing power distribution partition electric energy transmission by taking a three-port converter as a regulation node.
The traditional direct current power distribution system introduces the residual electric energy of an auxiliary power supply or a normal power distribution partition into a power distribution partition with a fault or insufficient power through switching of a manual or automatic switch so as to keep the continuous power supply capacity of the power distribution partition. The switching mode has the following disadvantages: (1) strong electromagnetic transient processes may exist in the switching process; (2) time delay exists in the switching process; (3) the continuous controllable adjustment of electric energy cannot be realized, and the flexibility is lacked; (4) switching can only exist between distribution busbars of the same voltage class. Therefore, a novel power distribution system electric energy regulation mechanism and strategy are designed from the aspects of improving the fault tolerance performance, the continuous power supply capacity and the reliability of the power distribution system, and flexible, quick and automatic transmission of electric energy among power distribution sub-regions is realized. This patent proposes the application scheme who regards three-port converter as power distribution system's power regulation and control node, can realize not tolerating the free flexible transmission of power between the distribution subregion to guaranteed through control strategy that the voltage of every distribution subregion is in the stable operating range of allowwing all the time in dynamic regulation and control, can show the performance that promotes power distribution system.
The invention aims to provide a method for realizing power distribution partition electric energy transmission by taking a three-port converter as a regulation node, which mainly contributes to and is characterized in that:
a system-level control strategy for realizing automatic and coordinated electric energy and flexible transmission of a three-port converter serving as a regulation node in a three-partition power distribution system is designed, and can be realized under the control strategy:
(1) compared with the traditional mode of determining and controlling the power transmission direction, the power distribution control device can realize free and smooth switching and flexible adjustment of the power transmission direction and the power transmission size among the three power distribution sub-areas;
(2) when power is transmitted among three power distribution partitions connected with the three-port converter, based on the fusion of a control strategy and constraint conditions, the bus voltage of the power distribution partition for receiving power can be ensured not to exceed the highest voltage threshold value of stable operation of the power distribution partition, and the bus voltage of the power distribution partition for outputting power can not be lower than the lowest voltage threshold value of stable operation of the power distribution partition
The purpose of the invention is realized by combining the attached drawings 1 and 2:
as shown in fig. 1, the three power distribution partitions use an isolated three-port converter decoupled by hardware as a node for regulating and controlling electric energy, the topology structure of the three-port converter is shown by a dotted line in the figure, two sides of a High Frequency Transformer HFT1(High Frequency Transformer) are respectively connected with a full-bridge converter a and a full-bridge converter C, and two sides of a High Frequency Transformer HFT2 are respectively connected with a full-bridge converter B and a full-bridge converter C. The duty ratio of all the switching tubes in the full-bridge converter A is 0.5, the upper switching tube and the lower switching tube of the same bridge arm are in a complementary conduction mode, and the phase shift angle between the bridge arm A1 and the bridge arm A2 is fixed to be 180 degrees. Full-bridge inverters B and C have the same operating mode as full-bridge inverter a. The hardware-decoupled isolated three-port converter can be divided into two double-active-bridge converters for analysis, and the working principle of the double-active-bridge converter is mature technology and is not described in detail herein. The three ports of the three-port converter are shown connected to three dc distribution partitions, labeled distribution partitions A, B and C, respectively. Taking distribution partition A as an example, power supply PS is connected in the partitionA(e.g. power supply provided by photovoltaic or wind power generation, etc.) and a load (shown as concentrated load R)ARepresentation). The configuration of the power distribution partitions B and C is similar to that of the power distribution partition A, and the description is omitted. Current sensors CSA, CSB and CSC of FIG. 1 are used to measure current i in power distribution sub-sections A, B and C, respectivelyA、iBAnd iCVoltage sensors VSA, VSB and VSC are used to measure DC bus voltage u of distribution bays A, B and C, respectivelyA、uBAnd uC。
The hardware-decoupled isolated three-port converter can be regarded as a combination of two dual-active-bridge converters respectively composed of a full-bridge converter A, C and a full-bridge converter B, C, and the three-port converter is controlled by coordinative control of the two dual-active-bridge converters. In the control strategy designed by the present patent, the relationship between the dual-active bridge converter composed of the full-bridge converters a and C and the dual-active bridge converter composed of the full-bridge converters B and C is equivalent, and the adopted control strategy and the control system structure are completely consistent, so the proposed control strategy is described below by taking the dual-active bridge converter composed of the full-bridge converters a and C as an example.
As shown in FIG. 2, the expected stable operation voltage value of the distribution subarea A is set to be uANThe minimum and maximum voltage thresholds of the stable operation area of the power distribution subarea C are respectively uCLAnd uCH. The voltage ring is used as an outer ring current ring and is used as a double-ring control structure of an inner ring. The voltage outer loop is provided with three control loops: the control object of the voltage control loop A1 is the DC bus voltage u of the power distribution subarea CCGiving a signal as the lowest voltage threshold u for stable operation of the distribution section CCL(ii) a The control object of the voltage control loop A2 is the DC bus voltage u of the power distribution subarea AAWill uAControlled at its desired stable operating voltage uANThe above step (1); the control object of the voltage control loop A3 is the DC bus voltage u of the power distribution subarea CCGiving the signal the maximum voltage threshold u for stable operation of the distribution section CCH. Controller G of three voltage control loopsA1、GA2And GA3Are all PI regulators. Deviation e of three voltage loopsVA1、eVA2And eVA3Respectively passing through respective regulators and amplitude limiting to obtain signal iA1、iA2And iA3. Will signal iA2And iA3Inputting and taking small link minA(x, y) post-selection signal iAminThen, againWill signal iAminAnd iA1Input large ring section maxA(x, y) deriving a given signal i for the current inner loopAR. The control object of the current inner loop is the current i input into the full-bridge converter A by the distribution subarea AAWill give a signal iARAnd a feedback quantity iADifference e ofCASent to a PI regulator GACObtaining the phase shift angle of the driving pulse of the full-bridge converter A relative to the full-bridge converter C
Figure GDA0003048709520000054
The dual active bridge converter formed by the full bridge converters B and C is identical to the control algorithm described above and will not be described herein. The phase shift angle of the drive pulse of the full-bridge converter B relative to the full-bridge converter C can be obtained
Figure GDA0003048709520000055
Fig. 1 is a schematic diagram of a three-isolated power distribution partition topology using a three-port converter as a regulation node in the patent.
Fig. 2 is a schematic diagram of a three-isolated power distribution zone control strategy using a three-port converter as a regulation node.
FIG. 3 shows the DC bus voltage u for three distribution sectionsA、uBAnd uCAnd (4) waveform.
Fig. 4 shows power waveforms output by three-port converter from power distribution partitions A, B and C.
(V) detailed description of the preferred embodiments
(2) Respectively obtaining direct current bus voltage values u of three distribution subareas by using voltage sensors VSA, VSB and VSCA、uBAnd uC. Comparing the voltage threshold value set in initialization with the voltage value collected by the sensor to obtain a deviation signal eVA1～eVA3And eVB1～eVB3Each deviation signal is input to a corresponding voltage loop controller GA1～GA3And GB1～GB3In the method, each controller output is subjected to amplitude limiting to obtain a signal iA1～iA3，iB1～iB3。
(3) Signals i generated by voltage control loops A2 and A3A2And iA3By taking small ring segments of min1(x, y) to obtain a signal iAmin(ii) a The signal i generated by the voltage control loops B2 and B3B2And iB3By taking small ring segments of min2(x, y) to obtain a signal iBmin。
(4) Signal i output from voltage control loop A1A1And taking the minor loop min1Output signal iAminFeeding in and taking out large link max1(x, y) obtaining a current setting signal i by judgmentAR(ii) a Signal i output from voltage control loop B1B1And taking the minor loop min2Output signal iBminFeeding in and taking out large link max2(x, y) obtaining a current setting signal i by judgmentBR。
(5) Giving the current obtained in (4) to a signal iARAnd iBRThe currents i of the two power distribution subareas are respectively obtained through the measurement of the current sensors CSA and CSBAAnd iBMaking a difference to obtain a deviation eCAAnd eCB. Deviation eCAAnd eCBRespectively input current controller GACAnd GBCCalculating to obtain the phase shift angle of the full-bridge converter A relative to the full-bridge converter C
Figure GDA0003048709520000051
And the phase shift angle of the full-bridge inverter B relative to the full-bridge inverter C
Figure GDA0003048709520000052
(6) Using the full-bridge converter C as a phase shift angle reference position to control the phase shift angle
Figure GDA0003048709520000053
The phase-shifted control signals are used as phase-shifted control signals of the full-bridge converter carriers A and B, and signals with the amplitude being one half of the carrier period are used as modulation signals for PWM modulation, so that pulse signals for driving the switching tubes of the two full-bridge converters A and B are finally obtained.
(7) And (4) repeatedly executing the steps (2) to (6) under the condition that a stop instruction is not obtained, and otherwise, exiting the running state.
1 description of amplitude limiting of output signal of voltage control loop
As can be seen from fig. 2, the voltage control loops a1 to A3 have the same structure as the voltage control loops B1 to B3, and the setting of the output slice of the voltage control loops has similarity, and the following description will be given only by taking the voltage control loops a1 to A3 as examples.
The clipping of the voltage control loop A1 is iA1min～0(iA1min<0) This clipping ensures the dc bus voltage u at the distribution bay CCBelow a threshold uCLThe time C partition absorbs power from the partition A, and then i is determined according to the maximum input current which can be borne by the power distribution partition CA1minThe value of (c).
The clipping of the voltage control loop A2 is iA2min～iA2max(iA2min<0，iA2max>0) Determining i according to the maximum input current born by the power distribution subarea AA2maxI is determined according to the maximum input current that the power distribution section C can bearA2minThe value of (c).
The amplitude limit of the voltage control loop A3 is 0-iA3max(iA3max>0) This clipping ensures the dc bus voltage u at the distribution bay CCAbove threshold uCHThe time C subarea outputs power outwards, and then i is determined according to the maximum input current which can be borne by the power distribution subarea AA3maxThe value of (c).
With the method described in the patent, the desired voltage stabilization operating values of the dc bus of distribution block A, B are set to be, respectively, based on the input power to the system: u. ofAN＝1800V、u BN1800V; the low voltage threshold and the high voltage threshold of the stable operation of the power distribution subarea C are respectively set as: u. ofCL＝1750V、u CH1850V; concentrated load R of three distribution partitionsA＝RB＝RB10 Ω. Power supply PS of power distribution partition AAThe output power is always 40 KW; power supply PS of power distribution partition BBThe output power is 40KW when 0-0.3 s, and 28.9KW when 0.3-1.4 s; power distributionPower supply PS of partition CCThe output power is 40KW at 0-0.6 s, 28.9KW at 0.6-1 s, and 36.1KW at 0.6-1.4 s. Obtaining DC bus voltage waveform u of three distribution subareas through simulationA、uBAnd uCAs shown in fig. 3. Distribution partition A, B and C outputs power P through three-port converterA、PBAnd PCThe waveform is shown in fig. 4.

Claims (2)

1. The method for realizing power distribution partition electric energy transmission by taking the three-port converter as a regulation node is characterized by comprising the following steps of:
(1) in the initial stage of system power-on, making initialization work of software and hardware related to system control, setting current controller GAC、GBCAnd a voltage controller GA1、GA2、GA3、GB1、GB2、GB3Is 0, and the stable operation voltages of the direct current buses of the power distribution subareas A and B are respectively set as uANAnd uBNThe upper limit and the lower limit of the stable operation voltage of the direct current bus of the power distribution subarea C are respectively uHCAnd uLC；
(2) Respectively obtaining direct current bus voltage values u of three distribution subareas by using voltage sensors VSA, VSB and VSCA、uBAnd uCComparing the voltage threshold value set in initialization with the voltage value collected by the sensor to obtain a deviation signal eVA1、eVA2、eVA3And eVB1、eVB3、eVB3Each deviation signal is input to a corresponding voltage controller GA1、GA2、GA3And GB1、GB1、GB3In the method, the signal output by each voltage controller is subjected to amplitude limiting to obtain iA1、iA2、iA3，iB1、iB1、iB3；
(3) Will signal iA2And iA3By taking small ring segments of min1(x, y) to obtain a signal iAmin(ii) a Will signal iB2And iB3By taking out small ring segmentsmin2(x, y) to obtain a signal iBmin；
(4) Will signal iA1Sum signal iAminFeeding in and taking out large link max1(x, y) obtaining a current setting signal i by judgmentAR(ii) a Will signal iB1Sum signal iBminFeeding in and taking out large link max2(x, y) obtaining a current setting signal i by judgmentBR；
(5) Giving current to signal iARAnd iBRThe currents i of the two power distribution subareas are respectively obtained through the measurement of the current sensors CSA and CSBAAnd iBMaking a difference to obtain a deviation eCAAnd eCB(ii) a Deviation eCAAnd eCBRespectively input current controller GACAnd GBCCalculating to obtain the phase shift angle of the full-bridge converter A relative to the full-bridge converter C
Figure FDA0003048709510000011
And the phase shift angle of the full-bridge inverter B relative to the full-bridge inverter C
Figure FDA0003048709510000012
(6) Using the full-bridge converter C as a phase shift angle reference position to control the phase shift angle
Figure FDA0003048709510000013
Figure FDA0003048709510000014
The phase-shifted control signals are used as phase-shifted control signals of the full-bridge converter carriers A and B, and signals with the amplitude of one half of the carrier period are used as modulation signals for PWM modulation to obtain pulse signals for driving the switching tubes of the two full-bridge converters A and B;
(7) and (4) repeatedly executing the steps (2) to (6) under the condition that a stop instruction is not obtained, and otherwise, exiting the running state.
2. The method of claim 1 for implementing power distribution partition power transmission with a three-port converter as a regulation node, wherein: the duty ratio of all the switch tubes in the full-bridge converter A is 0.5, the upper switch tube and the lower switch tube of the same bridge arm are in a complementary conduction mode, the phase shift angle between the bridge arm A1 and the bridge arm A2 is fixed to be 180 degrees, and the full-bridge converters B and C have the same working mode as the full-bridge converter A.
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