CN110768235B - Control method of direct-current microgrid multi-mode bidirectional DC-DC converter - Google Patents
Control method of direct-current microgrid multi-mode bidirectional DC-DC converter Download PDFInfo
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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
- H02J1/102—Parallel operation of dc sources being switching converters
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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
- H02J1/14—Balancing the load in a network
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
- H02M3/1586—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a control method of a direct current micro-grid multi-mode bidirectional DC-DC converter, which comprises the following steps of obtaining the voltage of a direct current bus in a three-phase staggered parallel Buck-Boost main circuit; judging whether the voltage of the direct current bus is equal to zero or not; when the voltage of the direct current bus is equal to zero, controlling the converter to work in a voltage source mode, and boosting the voltage of the storage battery to establish the voltage of the direct current bus; and when the voltage of the direct current bus is not equal to zero, detecting the voltage value of the direct current bus, selecting the state of a switch according to the mode if the voltage value of the direct current bus is in a preset range, and working in a dispatching control mode or an automatic control mode, wherein in the dispatching control mode, the charging and discharging current of the energy storage battery is adjusted according to the signal output by the upper dispatching system, so that the voltage of the direct current bus tends to be stable, and in the automatic control mode, the storage battery is automatically charged and discharged according to the voltage value of the bus. The invention has the beneficial effects that: the micro-grid system can be ensured to stably and reliably operate by scheduling or automatic charging and discharging control of the storage battery.
Description
Technical Field
The invention relates to the field of micro-grids, in particular to a control method of a direct-current micro-grid multi-mode bidirectional DC-DC converter.
Background
The direct-current micro-grid is a micro-grid formed by direct current, and the direct-current micro-grid can be more efficiently connected into direct-current loads such as photovoltaic distributed power generation units, energy storage units, electric vehicles and the like. The direct current micro-grid adopts a public direct current bus as a distributed power supply to be connected, the photovoltaic unit, the energy storage unit and the like can be connected into the bus only through the DC-DC module, compared with the alternating current micro-grid, the power generation unit has fewer DC-AC modules, and the efficiency of reducing the power conversion series is improved. The direct-current micro-grid is suitable for being applied to data centers, industrial parks, electric vehicle charging stations and the like to form an optical-storage-charging direct-current micro-grid system.
At present, in the field of micro-grids, two modes of Boost and Buck are mostly used, and an upper-layer scheduling system is used for carrying out centralized scheduling control on the micro-grids to realize the flow of current in two directions, but the control method has the defects of large ripple and unstable voltage.
Disclosure of Invention
Aiming at the problems, the invention provides a control method of a direct-current micro-grid multi-mode bidirectional DC-DC converter, which mainly solves the problems of large ripple and unstable voltage caused by controlling the current direction by using two modes of Boost and Buck.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a control method of a direct current micro-grid multi-mode bidirectional DC-DC converter comprises the following steps,
step 1, acquiring the voltage of a direct current bus in a three-phase staggered parallel Buck-Boost main circuit;
step 2, judging whether the voltage of the direct current bus is equal to zero or not;
step 3, when the voltage of the direct current bus is equal to zero, controlling the converter to work in a voltage source mode, and boosting the voltage of the storage battery to establish the voltage of the direct current bus;
step 4, when the voltage of the direct current bus is not equal to zero, detecting the voltage value of the direct current bus, and if the voltage value of the direct current bus is in a preset range, selecting the state of a switch according to a mode, and working in a dispatching control mode or an automatic control mode; in the automatic control mode, the storage battery is automatically charged and discharged according to the voltage value of the direct current bus without the intervention of a scheduling system.
In some embodiments, the step 3 includes a step of defining a dc bus voltage target value as V in the voltage source mode* busThe actual value of the DC bus voltage is defined as VbusSaid V is* busAnd VbusSubtracting to obtain a voltage deviation signal, inputting the voltage deviation signal into a bus voltage controller, and outputting a current instruction signal I after the signal output by the bus voltage controller is subjected to amplitude limiting* lxThe current command signal I* lxIn turn with the inductance La、Lb、LcCurrent of (I)lA、IlBAnd IlCAnd subtracting to respectively obtain three current deviation signals, wherein the three current deviation signals output control signals u through a battery current controller, the control output signals u calculate actual duty ratio duty, the actual duty ratio duty generates PWM (pulse width modulation) switching signals through a DSP (digital signal processor), and the PWM switching signals are finally output to an IGBT (insulated gate bipolar transistor) switching tube.
In some embodiments, when the converter operates in the dispatch control mode, the converter has two functions of charging and discharging at the target value of the voltage of the storage battery and charging and discharging at constant power, and if the converter performs charging and discharging at the target value of the voltage of the storage battery, the controller operates in the voltage control mode: the battery voltage feed-forward signal is defined as VbatThe target value of the battery voltage is defined as VbatSaid V isbatAnd VbatSubtracting to obtain a voltage deviation signal, inputting the voltage deviation signal into a battery voltage controller, and outputting a current instruction signal I after the signal output by the battery voltage controller is subjected to amplitude limiting* lxThe current command signal I* lxIn turn with the inductance La、Lb、LcCurrent of (I)lA、IlBAnd IlCSubtracting to obtain three current deviation signals, respectively, outputting control signal u via battery current controller, and outputting control signals u and VbatAdding to obtain a voltage superposition signal, calculating an actual duty ratio duty by the voltage superposition signal, and generating the actual duty ratio duty through a DSP (digital signal processor)The PWM switching signal is finally output to the IGBT switching tube; if the charging and discharging are carried out at constant power, the controller works in a current control mode: the converter receives the power command signal PbatCalculating a current instruction I after the current instruction I is limited by a slope* lxAnd the subsequent signal processing mode is the same as the voltage control mode.
In some embodiments, in the automatic control mode, the dc bus voltage target value is defined as V* busThe actual value of the DC bus voltage is defined as VbusThe battery voltage feed-forward signal is defined as VbatSaid V is* busAnd VbusSubtracting to obtain a voltage deviation signal, inputting the voltage deviation signal into a bus voltage controller, and outputting a current instruction signal I after the signal output by the bus voltage controller is subjected to amplitude limiting* lxThe current command signal I* lxIn turn with the inductance La、Lb、LcCurrent of (I)lA、IlBAnd IlCSubtracting to obtain three current deviation signals, respectively, outputting control signal u via battery current controller, and outputting control signals u and VbatAnd adding to obtain a voltage superposition signal, calculating an actual duty ratio duty by the voltage superposition signal, generating a PWM (pulse-width modulation) switching signal by the actual duty ratio duty through a DSP (digital signal processor), and finally outputting the PWM switching signal to the IGBT switching tube.
In some embodiments, the converter sets the voltage of the dc bus to a range of V1 V2](V1＜V2) Higher than V1The direct current bus charges the storage battery at the value lower than V2The storage battery discharges the direct current bus at the value.
In some embodiments, the bus voltage controller and the battery current controller both employ PI controllers.
In some embodiments, the battery voltage controller and the battery current controller both employ PI controllers.
In some embodiments, the three-phase crossingInductive current control in a staggered parallel Buck-Boost main circuit shares the same current instruction signal I* lx。
The invention has the beneficial effects that:
1. the direct-current voltage stabilizing system can realize automatic networking of a direct-current system, provide photovoltaic power generation input, stabilize direct-current voltage through scheduling or automatic charging and discharging control of the storage battery, and ensure stable and reliable operation of the micro-grid system.
2. The control method adopts current source control to directly control the magnitude and direction of current, does not need to select a boosting or voltage-reducing mode, has high response speed, and can quickly adjust the output voltage to reach a stable value when the input voltage changes.
Drawings
FIG. 1 is a topological diagram of a three-phase interleaved parallel Buck-Boost main circuit of the invention;
FIG. 2 is a flow chart of the multi-mode operation of the present invention;
fig. 3 is a control block diagram of the DC-DC control method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the following detailed description of the present invention is provided with reference to the accompanying drawings and detailed description. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
According to the illustration in fig. 1, the embodiment provides a direct-current microgrid multi-mode bidirectional DC-DC converter, a main circuit adopts a Buck-Boost bidirectional topological structure with three phases connected in parallel in an interlaced manner, and three phases of three bridge arms are formed by IGBT switching tubes T1、T2、T3、T4、T5、T6The three-phase inductor comprises A, B, C three phases, wherein every two IGBT switching tubes are connected in series to form a bridge arm, the three bridge arms are connected in parallel and are respectively connected with the anode and the cathode of a high-voltage side, the midpoints of the three bridge arms are defined as a midpoint a, a midpoint b and a midpoint c, and the midpoint a, the midpoint b and the midpoint c are respectively connected with an inductor La、Lb、LcIs connected to three of the inductors La、Lb、LcThe other end of the first capacitor is connected with the positive electrode of the low-voltage side, the high-voltage side and the low-voltage side are respectively connected with a capacitor, and the negative electrode of the high-voltage side and the negative electrode of the low-voltage side are connected to form a common ground. The phase difference of the driving signals of the switching tubes corresponding to the three-phase three-bridge arm in one switching period is 120 degrees, and the switching control of each phase is independent.
As shown in fig. 2 and 3, based on the above-mentioned multi-mode bidirectional DC-DC converter for the micro-grid, the present invention further provides a control method for the multi-mode bidirectional DC-DC converter for the micro-grid, which comprises the following steps,
step 1, acquiring the voltage of a direct current bus in a three-phase staggered parallel Buck-Boost main circuit;
step 2, judging whether the voltage of the direct current bus is equal to zero or not;
step 3, when the voltage of the direct current bus is equal to zero, controlling the converter to work in a voltage source mode, and boosting the voltage of the storage battery to establish the voltage of the direct current bus;
step 4, when the voltage of the direct current bus is not equal to zero, detecting the voltage value of the direct current bus, and if the voltage value of the direct current bus is in a preset range, selecting the state of a switch according to a mode, and working in a dispatching control mode or an automatic control mode; in the automatic control mode, the storage battery is automatically charged and discharged according to the voltage value of the direct current bus without the intervention of a scheduling system. The preset range can work in the voltage range of various direct current buses. The automatic networking of a direct current system is realized, the photovoltaic power generation input is provided, and the storage battery is scheduled or automatically charged and discharged.
Specifically, the mode selection adopts the DSP processor to automatically detect the actual value of the direct current bus voltage, so that the mode selection operation is automatically carried out.
Specifically, the mode selection switch may be a toggle switch on the converter.
The step 3 comprises the step that in the voltage source mode, the target value of the direct current bus voltage is defined as V* busThe actual value of the DC bus voltage is defined as VbusSaid V is* busAnd VbusSubtracting to obtain a voltage deviation signal, inputting the voltage deviation signal into a bus voltage controller, and outputting a current instruction signal I after the signal output by the bus voltage controller is subjected to amplitude limiting* lxThe current command signal I* lxIn turn with the inductance La、Lb、LcCurrent of (I)lA、IlBAnd IlCAnd subtracting to respectively obtain three current deviation signals, wherein the three current deviation signals output control signals u through a battery current controller, the control output signals u calculate actual duty ratio duty, the actual duty ratio duty generates PWM (pulse width modulation) switching signals through a DSP (digital signal processor), and the PWM switching signals are finally output to an IGBT (insulated gate bipolar transistor) switching tube.
Under the dispatching control mode, the controller has two functions of charging and discharging with the voltage target value of the storage battery and charging and discharging with constant power, and if the storage battery is charged and discharged with the voltage target value of the storage battery, the controller works in the voltage control mode: the battery voltage feed-forward signal is defined as VbatThe target value of the battery voltage is defined as VbatSaid V isbatAnd VbatSubtracting to obtain a voltage deviation signal, inputting the voltage deviation signal into a battery voltage controller, and outputting a current instruction signal I after the signal output by the battery voltage controller is subjected to amplitude limiting* lxThe current command signal I* lxIn turn with the inductance La、Lb、LcCurrent of (I)lA、IlBAnd IlCSubtracting to obtain three current deviation signals, respectively, outputting control signal u via battery current controller, and outputting control signals u and VbatAdding to obtain a voltage superposition signal, calculating an actual duty ratio duty of the voltage superposition signal, wherein the actual duty ratio duty is obtained through DThe SP processor generates a PWM switching signal, and the PWM switching signal is finally output to an IGBT switching tube; if the charging and discharging are carried out at constant power, the controller works in a current control mode: the converter receives the power command signal PbatCalculating a current instruction I after the current instruction I is limited by a slope* lxAnd the subsequent signal processing mode is the same as the voltage control mode. The controller is the total controller of the outer loop voltage controller plus the inner loop current shown in fig. 3.
In the automatic control mode, the target value of the DC bus voltage is defined as V* busThe actual value of the DC bus voltage is defined as VbusThe battery voltage feed-forward signal is defined as VbatSaid V is* busAnd VbusSubtracting to obtain a voltage deviation signal, inputting the voltage deviation signal into a bus voltage controller, and outputting a current instruction signal I after the signal output by the bus voltage controller is subjected to amplitude limiting* lxThe current command signal I* lxIn turn with the inductance La、Lb、LcCurrent of (I)lA、IlBAnd IlCSubtracting to obtain three current deviation signals, respectively, outputting control signal u via battery current controller, and outputting control signals u and VbatAnd adding to obtain a voltage superposition signal, calculating an actual duty ratio duty by the voltage superposition signal, generating a PWM (pulse-width modulation) switching signal by the actual duty ratio duty through a DSP (digital signal processor), and finally outputting the PWM switching signal to the IGBT switching tube.
The converter sets the voltage of the direct current bus within a range of V1 V2](V1＜V2) Higher than V1The direct current bus charges the storage battery at the value lower than V2The storage battery discharges the direct current bus at the value.
And the bus voltage controller and the battery current controller both adopt PI controllers.
And the battery voltage controller and the battery current controller both adopt PI controllers.
The three-phase staggered parallel Buck-Boost main unitThe inductor current control in the circuit shares the same current command signal I* lxThe balance of three-phase current can be realized.
The working principle is as follows: three working modes are mainly set for controlling charging and discharging of a microgrid, automatic networking of a photovoltaic and energy storage direct current microgrid system is realized, photovoltaic power generation input is provided, direct current voltage is stabilized through scheduling or automatic charging and discharging control of a storage battery, the microgrid system can stably and reliably operate, output voltage reaches a stable value, a control method adopts current source control, the size and the direction of current are directly controlled, a boosting or voltage reducing mode does not need to be selected, response speed is high, and when input voltage changes, the microgrid system can be rapidly adjusted.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (7)
1. A control method of a direct current micro-grid multi-mode bidirectional DC-DC converter is characterized by comprising the following steps,
step 1, acquiring the voltage of a direct current bus in a three-phase staggered parallel Buck-Boost main circuit;
step 2, judging whether the voltage of the direct current bus is equal to zero or not;
step 3, when the voltage of the direct current bus is equal to zero, controlling the converter to work in a voltage source mode, and boosting the voltage of the storage battery to establish the voltage of the direct current bus;
step 4, when the voltage of the direct current bus is not equal to zero, detecting the voltage value of the direct current bus, and if the voltage value of the direct current bus is in a preset range, selecting the state of a switch according to a mode, and working in a dispatching control mode or an automatic control mode; in the automatic control mode, the storage battery is automatically charged and discharged according to the voltage value of the direct current bus without the intervention of a scheduling system;
under the dispatching control mode, the double-loop controller has two functions of charging and discharging with the voltage target value of the storage battery and charging and discharging with constant power, and if the voltage target value of the storage battery is used for charging and discharging, the double-loop controller for the voltage and the current of the storage battery works in the voltage control mode: the battery voltage feed-forward signal is defined as VbatThe target value of the battery voltage is defined as VbatSaid V isbatAnd VbatSubtracting to obtain a voltage deviation signal, inputting the voltage deviation signal into a battery voltage controller, and outputting a current instruction signal I after the signal output by the battery voltage controller is subjected to amplitude limiting* lxThe current command signal I* lxIn turn with the inductance La、Lb、LcCurrent of (I)lA、IlBAnd IlCSubtracting to obtain three current deviation signals, respectively, outputting control signal u via battery current controller, and outputting control signals u and VbatAdding to obtain a voltage superposition signal, calculating an actual duty ratio duty by the voltage superposition signal, generating a PWM (pulse-width modulation) switching signal by the actual duty ratio duty through a DSP (digital signal processor), and finally outputting the PWM switching signal to an IGBT (insulated gate bipolar transistor) switching tube; if the battery is charged and discharged with constant power, the battery current controller works in a current control mode: the converter receives the power command signal PbatAfter the slope limitation, a current instruction I is calculated* lxAnd the subsequent signal processing mode is the same as the voltage control mode.
2. The direct current microgrid multi-mode bidirectional DC-DC converter control method of claim 1, characterized in that said step 3 includes a step of defining a direct current bus voltage target value as V in said voltage source mode* busThe actual value of the DC bus voltage is defined as VbusSaid V is* busAnd VbusSubtracting to obtain a voltage deviation signal, the voltageThe deviation signal is input into a bus voltage controller, and the signal output by the bus voltage controller outputs a current instruction signal I after amplitude limiting* lxThe current command signal I* lxIn turn with the inductance La、Lb、LcCurrent of (I)lA、IlBAnd IlCAnd subtracting to respectively obtain three current deviation signals, wherein the three current deviation signals output control signals u through a battery current controller, the control signals u calculate an actual duty ratio duty, the actual duty ratio duty generates PWM (pulse width modulation) switching signals through a DSP (digital signal processor), and the PWM switching signals are finally output to an IGBT (insulated gate bipolar transistor) switching tube.
3. The method of claim 1, wherein in the automatic control mode, the DC bus voltage target value is defined as V* busThe actual value of the DC bus voltage is defined as VbusThe battery voltage feed-forward signal is defined as VbatSaid V is* busAnd VbusSubtracting to obtain a voltage deviation signal, inputting the voltage deviation signal into a bus voltage controller, and outputting a current instruction signal I after the signal output by the bus voltage controller is subjected to amplitude limiting* lxThe current command signal I* lxIn turn with the inductance La、Lb、LcCurrent of (I)lA、IlBAnd IlCSubtracting to obtain three current deviation signals, respectively, outputting control signal u via battery current controller, and outputting control signals u and VbatAnd adding to obtain a voltage superposition signal, calculating an actual duty ratio duty by the voltage superposition signal, generating a PWM (pulse-width modulation) switching signal by the actual duty ratio duty through a DSP (digital signal processor), and finally outputting the PWM switching signal to the IGBT switching tube.
4. The method of claim 3, wherein the converter sets the voltage of the DC bus to a desired valueIn the range of [ V1 V2]，V1＜V2Higher than V1The direct current bus charges the storage battery at the value lower than V2The storage battery discharges the direct current bus at the value.
5. The method for controlling the direct-current microgrid multi-mode bidirectional DC-DC converter as claimed in any one of claims 2 or 4, characterized in that a PI controller is adopted for both the bus voltage controller and the battery current controller.
6. The method according to claim 3, wherein the battery voltage controller and the battery current controller are PI controllers.
7. The control method of the direct-current microgrid multi-mode bidirectional DC-DC converter as claimed in claim 1, characterized in that inductive current control in the three-phase interleaved parallel Buck-Boost main circuit shares the same current command signal I* lx。
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| CN111555614A (en) * | 2020-04-14 | 2020-08-18 | 中南大学 | Interleaved DC-DC converter of automobile dual power supply system and control method thereof |
| CN113708359B (en) * | 2020-05-21 | 2024-04-05 | 中车株洲电力机车研究所有限公司 | Bidirectional DCDC converter control method, system and related components |
| CN112994157B (en) * | 2021-03-01 | 2023-05-23 | 株洲中车时代电气股份有限公司 | Self-adaptive bidirectional DCDC charge and discharge control method and device |
| CN115663979A (en) * | 2022-12-13 | 2023-01-31 | 麦田能源有限公司 | Voltage balancing method of battery pack, battery energy storage and power supply system and electronic device |
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