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CN110768235B - Control method of multi-mode bidirectional DC-DC converter for DC microgrid - Google Patents

Control method of multi-mode bidirectional DC-DC converter for DC microgrid Download PDF

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CN110768235B
CN110768235B CN201910943440.3A CN201910943440A CN110768235B CN 110768235 B CN110768235 B CN 110768235B CN 201910943440 A CN201910943440 A CN 201910943440A CN 110768235 B CN110768235 B CN 110768235B
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voltage
bus
signal
current
battery
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CN110768235A (en
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吴昌宏
舒杰
王浩
宋香荣
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Guangzhou Institute of Energy Conversion of CAS
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Guangzhou Institute of Energy Conversion of CAS
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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
    • 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
    • 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
    • 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
    • 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

本发明公开一种直流微电网多模式双向DC‑DC变流器控制方法，包括如下步骤，在三相交错并联型Buck‑Boost主电路中获取直流母线的电压；判断直流母线的电压是否等于零；当直流母线的电压等于零，控制变流器工作于电压源模式，蓄电池升压建立直流母线电压；当直流母线的电压不等于零，检测直流母线的电压数值，若直流母线的电压数值在预设范围，根据模式选择开关状态,工作于调度控制模式或者自动控制模式:在调度控制模式，根据上层调度系统输出的信号调节储能电池的充放电电流，使直流母线的电压趋于稳定，在自动控制模式,根据母线电压值自动对蓄电池进行充放电。本发明的有益效果是：通过对蓄电池的调度或自动充放电控制，确保微电网系统能够稳定可靠运行。

Figure 201910943440

The invention discloses a control method for a multi-mode bidirectional DC-DC converter of a direct current microgrid, comprising the following steps: obtaining the voltage of a direct current bus in a three-phase interleaved parallel type Buck-Boost main circuit; and judging whether the voltage of the direct current bus is equal to zero; When the voltage of the DC bus is equal to zero, the control converter works in the voltage source mode, and the battery boosts the voltage to establish the DC bus voltage; when the voltage of the DC bus is not equal to zero, the voltage value of the DC bus is detected, and if the voltage value of the DC bus is within the preset range , select the switch state according to the mode, and work in the dispatch control mode or the automatic control mode: in the dispatch 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 DC bus tends to be stable, and in the automatic control mode In the mode, the battery is automatically charged and discharged according to the bus voltage value. The beneficial effects of the present invention are: through the scheduling or automatic charging and discharging control of the storage battery, the stable and reliable operation of the micro-grid system is ensured.

Figure 201910943440

Description

Control method of direct-current microgrid multi-mode bidirectional DC-DC converter
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)

1.一种直流微电网多模式双向DC-DC变流器控制方法，其特征在于，包括如下步骤，1. a direct current microgrid multi-mode bidirectional DC-DC converter control method, is characterized in that, comprises the steps, 步骤1，在三相交错并联型Buck-Boost主电路中获取直流母线的电压；Step 1, obtain the voltage of the DC bus in the three-phase interleaved parallel Buck-Boost main circuit; 步骤2，判断所述直流母线的电压是否等于零；Step 2, judging whether the voltage of the DC bus is equal to zero; 步骤3，当直流母线的电压等于零，控制变流器工作于电压源模式，蓄电池升压建立直流母线电压；Step 3, when the voltage of the DC bus is equal to zero, the converter is controlled to work in the voltage source mode, and the battery is boosted to establish the DC bus voltage; 步骤4，当直流母线的电压不等于零，检测直流母线的电压数值，若直流母线的电压数值在预设范围，根据模式选择开关的状态,工作于调度控制模式或者自动控制模式:在调度控制模式，根据上层调度系统输出的信号调节储能电池的充放电电流，微电网中的电源和负荷达到平衡，使直流母线的电压趋于稳定；在自动控制模式，无需调度系统干预，根据直流母线的电压值自动对蓄电池进行充放电；Step 4, when the voltage of the DC bus is not equal to zero, detect the voltage value of the DC bus, if the voltage value of the DC bus is in the preset range, select the state of the switch according to the mode, and work in the dispatch control mode or the automatic control mode: in the dispatch control mode , adjust the charging and discharging current of the energy storage battery according to the signal output by the upper-level dispatching system, the power supply and the load in the microgrid reach a balance, so that the voltage of the DC bus tends to be stable; in the automatic control mode, there is no need for the intervention of the dispatching system. The voltage value automatically charges and discharges the battery; 在所述调度控制模式下，具有以蓄电池电压目标值进行充放电和恒功率进行充放电两种功能，若以蓄电池电压目标值进行充放电，电池电压电流双环控制器工作在电压控制模式：电池电压前馈信号定义为Vbat，电池电压目标值定义为V*bat，所述Vbat以及V*bat作减法得到电压偏差信号，所述电压偏差信号输入电池电压控制器，所述电池电压控制器输出的信号进行限幅后输出电流指令信号I* lx，所述电流指令信号I* lx依次与电感La、Lb、Lc的电流IlA、IlB以及IlC作减法，分别得到三个电流偏差信号，三个所述电流偏差信号经电池电流控制器输出控制信号u，所述控制信号u与V*bat作加法得到电压叠加信号，所述电压叠加信号经计算出实际占空比duty，所述实际占空比duty通过DSP处理器生成PWM开关信号,所述PWM开关信号最终输出到IGBT开关管；若以恒功率进行充放电，所述电池电流控制器工作在电流控制模式：变流器根据接收的功率指令信号P*bat通过斜坡限制后，计算出电流指令I* lx，后续信号处理方式与所述电压控制模式相同。In the scheduling control mode, it has two functions: charging and discharging with the battery voltage target value and charging and discharging with constant power. If the battery voltage target value is used for charging and discharging, the battery voltage and current dual-loop controller works in the voltage control mode: The voltage feedforward signal is defined as V bat , the battery voltage target value is defined as V* bat , the V bat and V* bat are subtracted to obtain a voltage deviation signal, the voltage deviation signal is input to the battery voltage controller, and the battery voltage control After the signal output by the device is limited, the current command signal I * lx is output, and the current command signal I * lx is successively subtracted from the currents I1A , I1B and I1C of the inductances L a , L b and L c to obtain respectively Three current deviation signals, the three current deviation signals output the control signal u through the battery current controller, the control signal u and V* bat are added to obtain the voltage superposition signal, the voltage superposition signal is calculated to calculate the actual duty cycle ratio duty, the actual duty ratio duty generates a PWM switch signal through the DSP processor, and the PWM switch signal is finally output to the IGBT switch tube; if charging and discharging with constant power, the battery current controller works in the current control mode : The converter calculates the current command I * lx after passing the ramp limit according to the received power command signal P* bat , and the subsequent signal processing method is the same as the voltage control mode. 2.如权利要求1所述的直流微电网多模式双向DC-DC变流器控制方法，其特征在于，所述步骤3包括以下步骤，在所述电压源模式下，直流母线电压目标值定义为V* bus，直流母线电压实际值定义为Vbus，所述V* bus以及Vbus作减法得到电压偏差信号，所述电压偏差信号输入母线电压控制器，所述母线电压控制器输出的信号进行限幅后输出电流指令信号I* lx，所述电流指令信号I* lx依次与电感La、Lb、Lc的电流IlA、IlB以及IlC作减法，分别得到三个电流偏差信号，三个所述电流偏差信号经电池电流控制器输出控制信号u，所述控制信号u经计算出实际占空比duty，所述实际占空比duty通过DSP处理器生成PWM开关信号,所述PWM开关信号最终输出到IGBT开关管。2 . The method for controlling a multi-mode bidirectional DC-DC converter in a DC microgrid according to claim 1 , wherein the step 3 comprises the following steps, in the voltage source mode, the target value of the DC bus voltage is defined as: 2 . is V * bus , the actual value of the DC bus voltage is defined as Vbus , the V * bus and Vbus are subtracted to obtain a voltage deviation signal, the voltage deviation signal is input to the bus voltage controller, and the signal output by the bus voltage controller After limiting the output current command signal I * lx , the current command signal I * lx is successively subtracted from the currents I1A , I1B and I1C of the inductances L a , L b and L c to obtain three current deviations respectively. signal, the three current deviation signals output the control signal u through the battery current controller, and the control signal u calculates the actual duty cycle duty, and the actual duty cycle duty generates the PWM switching signal through the DSP processor, so the The PWM switch signal is finally output to the IGBT switch tube. 3.如权利要求1所述的直流微电网多模式双向DC-DC变流器控制方法，其特征在于，在所述自动控制模式下，直流母线电压目标值定义为V* bus，直流母线电压实际值定义为Vbus，电池电压前馈信号定义为Vbat，所述V* bus以及Vbus作减法得到电压偏差信号，所述电压偏差信号输入母线电压控制器，所述母线电压控制器输出的信号进行限幅后输出电流指令信号I* lx，所述电流指令信号I* lx依次与电感La、Lb、Lc的电流IlA、IlB以及IlC作减法，分别得到三个电流偏差信号，三个所述电流偏差信号经电池电流控制器输出控制信号u，所述控制信号u与V*bat作加法得到电压叠加信号，所述电压叠加信号经计算出实际占空比duty，所述实际占空比duty通过DSP处理器生成PWM开关信号,所述PWM开关信号最终输出到IGBT开关管。3. The method for controlling a multi-mode bidirectional DC-DC converter in a DC microgrid according to claim 1, wherein, in the automatic control mode, the target value of the DC bus voltage is defined as V * bus , and the DC bus voltage is defined as V*bus. The actual value is defined as V bus , the battery voltage feedforward signal is defined as V bat , the V * bus and V bus are subtracted to obtain a voltage deviation signal, the voltage deviation signal is input to the bus voltage controller, and the bus voltage controller outputs The current command signal I * 1x is outputted after the signal is limited, and the current command signal I * 1x is successively subtracted with the currents I1A , I1B and I1C of the inductances L a , L b and L c to obtain three Current deviation signal, the three current deviation signals output the control signal u through the battery current controller, the control signal u and V* bat are added to obtain the voltage superposition signal, the voltage superposition signal is calculated to calculate the actual duty cycle duty , the actual duty cycle duty generates a PWM switch signal through a DSP processor, and the PWM switch signal is finally output to the IGBT switch tube. 4.如权利要求3所述的直流微电网多模式双向DC-DC变流器控制方法，其特征在于，所述变流器将直流母线的电压设定范围为[V1 V2]，V1＜V2，高于V1值时直流母线对蓄电池充电，低于V2值时蓄电池对直流母线放电。4. The method for controlling a multi-mode bidirectional DC-DC converter in a DC microgrid according to claim 3, wherein the converter sets the voltage of the DC bus to [V 1 V 2 ], V 1 < V 2 , when the value is higher than V 1 , the DC bus charges the battery, and when the value is lower than V 2 , the battery discharges the DC bus. 5.如权利要求2或4中任意一项所述的直流微电网多模式双向DC-DC变流器控制方法，其特征在于，所述母线电压控制器以及电池电流控制器均采用PI控制器。5. The method for controlling a multi-mode bidirectional DC-DC converter of a direct current microgrid according to any one of claims 2 or 4, wherein the bus voltage controller and the battery current controller all use a PI controller . 6.如权利要求3所述的直流微电网多模式双向DC-DC变流器控制方法，其特征在于，所述电池电压控制器以及电池电流控制器均采用PI控制器。6 . The method for controlling a multi-mode bidirectional DC-DC converter of a DC microgrid according to claim 3 , wherein the battery voltage controller and the battery current controller both use a PI controller. 7 . 7.如权利要求1所述的直流微电网多模式双向DC-DC变流器控制方法，其特征在于，所述三相交错并联型Buck-Boost主电路中的电感电流控制共用同一个电流指令信号I* lx。7. The method for controlling a multi-mode bidirectional DC-DC converter in a direct current microgrid according to claim 1, wherein the inductor current control in the three-phase interleaved parallel type Buck-Boost main circuit shares the same current command Signal I * lx .
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