CN113644643A - AC/DC hybrid microgrid interface converter and control method - Google Patents
AC/DC hybrid microgrid interface converter and control method Download PDFInfo
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- CN113644643A CN113644643A CN202110831675.0A CN202110831675A CN113644643A CN 113644643 A CN113644643 A CN 113644643A CN 202110831675 A CN202110831675 A CN 202110831675A CN 113644643 A CN113644643 A CN 113644643A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the 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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to an alternating current-direct current hybrid microgrid interface converter and a control method. The alternating current side of the converter is connected with an alternating current sub-network through an isolation transformer, and the direct current side is connected with +/-375V direct current voltage in a grid-connected mode, so that the converter can be connected with power supply equipment such as energy storage equipment, photovoltaic equipment and the like. And the direct current load with the same voltage level can be directly connected without being converted by a DC/DC converter. The AC/DC hybrid microgrid interface converter can work in an AC voltage source mode under an island mode, and provides energy for an AC subnet through photovoltaic, energy storage and the like on the DC subnet. Therefore, the AC/DC hybrid microgrid interface converter can meet the energy mutual aid in different operation modes and the direct access of an AC/DC power supply and a load. The method has important engineering practical application value in distribution of the AC/DC distribution network.
Description
Technical Field
The invention relates to the technical field of converter grid-connected control, in particular to an alternating current-direct current hybrid micro-grid interface converter and a control method.
Background
With the development and utilization of renewable energy sources, distributed energy sources can generate direct current and non-power frequency alternating current, loads are also rapidly changed from single alternating current loads to alternating current and direct current mixed loads, and in order to enable various renewable energy sources to be efficiently utilized and meet different requirements of various loads, an alternating current and direct current mixed micro-grid technology is rapidly developed. The AC/DC hybrid micro-grid interface converter is connected with an AC bus and a DC bus, so that power in a micro-grid can flow in two directions, and a topological structure and a control mode of the AC/DC hybrid micro-grid interface converter are used as important factors influencing the stable operation of the whole micro-grid system.
At present, the direct-current output voltage of a common alternating-current and direct-current hybrid microgrid interface converter is unipolar voltage, the direct-current output voltage of the topological structure is unipolar, and the voltage level is high; it is necessary to connect the corresponding load after DC/DC conversion.
Therefore, how to meet the premise that the alternating current-direct current hybrid microgrid interface converter realizes the energy bidirectional flow function can not only realize that the direct current side of the alternating current-direct current converter can meet the requirements of the access of normal direct current voltage levels such as photovoltaic and energy storage, but also can meet the requirement of the direct current power utilization equipment for the direct access of voltage level output, and is a problem that the alternating current-direct current hybrid microgrid interface converter needs to solve urgently.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an AC-DC hybrid microgrid interface converter and a control method, wherein the AC side of the converter is connected with an AC subnet through an isolation transformer, and the DC side is connected with +/-375V DC voltage in a grid-connected mode, so that the converter can be connected with power supply equipment such as energy storage equipment, photovoltaic equipment and the like; the AC/DC hybrid microgrid interface converter can work in an AC voltage source mode under an island mode, and provides energy for an AC subnet through photovoltaic, energy storage and the like on the DC subnet.
In order to achieve the aim, the invention provides an AC/DC hybrid microgrid interface converter which comprises a main control unit, two power modules and an AC/DC sampling unit;
the alternating current sides of the two power modules are connected with an alternating current sub-network after being connected together through a double-split transformer; the negative electrode of the first power module at the direct current side of the two power modules is connected with the positive electrode of the second power module to be used as an N electrode, so that a positive and negative bipolar direct current bus is formed;
the alternating current and direct current sampling unit collects current and voltage at the alternating current side and the direct current side of the power module and feeds the current and voltage back to the main control unit;
the main control unit controls the two power modules, so that the alternating-current/direct-current hybrid micro-grid interface converter works in a voltage stabilization mode in a grid-connected scene, a constant-current or constant-power mode in the grid-connected scene and an off-grid operation mode in an island scene.
Further, the voltage stabilization mode working in the grid-connected scene includes: the AC-DC hybrid microgrid interface converter is used as a voltage source, the two power modules convert alternating current into direct current for output, and the main control unit carries out PI (proportional integral) regulation on the two power modules based on the magnitude of the direct current voltage output by the two power modules fed back by the AC-DC sampling unit, so that the direct current voltage output by the two power modules reaches a set constant voltage value and is output at a constant voltage.
Further, when the alternating current-direct current hybrid microgrid interface converter is used as a voltage source, the two power modules respectively stabilize the voltage to 375V.
Further, the constant current mode working in the grid-connected scene includes: the AC/DC hybrid microgrid interface converter is used as a current source, the two power modules realize energy transfer between the AC/DC sub-networks, and the main control unit performs PI regulation on the two power modules based on the AC/DC sampling unit for feeding back the magnitude of AC current input by the two power modules, so that the AC current output by the two power modules reaches a set value and is output in a constant current mode.
Further, the constant power mode working in the grid-connected scene includes: the AC/DC hybrid microgrid interface converter is used as a current source, the two power modules realize energy transfer between an AC/DC sub-network, the main control unit calculates the input power based on the AC/DC sampling unit feeding back the input alternating current of the two power modules, obtains the output power of the two power modules based on the corresponding relation between the input power and the output power, and performs PI regulation on the two power modules based on the output power so that the output power of the two power modules reaches a set power value and constant power is output.
Further, the off-grid operation mode working in an island scene includes: the main control unit feeds back the magnitude of the input alternating-current voltage of the two power modules based on the alternating-current and direct-current sampling unit to perform PI control, and the alternating-current voltage is stabilized; the control method comprises the following steps of adopting an alternating voltage outer ring and a current inner ring for control: the voltage command is used as the input of a d axis of a voltage outer ring after per unit, the input of a q axis is 0, alternating voltage is used as the feedback of the voltage outer ring after dq conversion, and the output of the voltage outer ring is used as the input of a current inner ring after PI regulation.
Further, the direct current bus is connected with a direct current sub-network, and the direct current sub-network can be connected with a photovoltaic power generation module, an energy storage module and charging pile equipment.
Further, in a constant power mode in a grid-connected scene and an off-grid operation mode in an island scene, dc bipolar voltage-sharing control needs to be performed, and the method comprises the following steps: the main control unit is provided with a direct current voltage PI control loop, the input of the direct current voltage PI control loop is half bus voltage, the feedback is direct current voltage at the side of the module, and the output is added into the current inner loop as disturbance quantity.
On the other hand, a control method of the alternating current-direct current hybrid microgrid interface converter is provided, and comprises the following steps:
selecting a working mode:
if a voltage stabilization mode working in a grid-connected scene is selected, the AC/DC hybrid microgrid interface converter is controlled to serve as a voltage source, the two power modules convert AC into DC for output, and the main control unit performs PI regulation on the two power modules based on the magnitude of the DC voltage output by the two power modules fed back by the AC/DC sampling unit, so that the DC voltage output by the two power modules reaches a set constant voltage value and is output at a constant voltage;
if a constant current mode working in a grid-connected scene is selected, the AC/DC hybrid microgrid interface converter is controlled to serve as a current source, the two power modules realize energy transfer between the AC/DC sub-networks, and the main control unit performs PI regulation on the two power modules based on the AC/DC sampling unit which feeds back the magnitude of AC current input by the two power modules, so that the AC current output by the two power modules reaches a set value and is output in a constant current mode;
if a constant power mode working in a grid-connected scene is selected, the AC/DC hybrid microgrid interface converter is controlled to serve as a current source, the two power modules realize energy transfer between an AC/DC sub-network, the main control unit calculates the input power based on the AC/DC sampling unit and the AC current input by the two power modules, obtains the output power of the two power modules based on the corresponding relation between the input power and the output power, and performs PI (proportional integral) regulation on the two power modules based on the output power so that the output power of the two power modules reaches a set power value and constant power is output;
if the off-grid operation mode working in an island scene is selected, the method comprises the following steps: the main control unit feeds back the magnitude of the input alternating-current voltage of the two power modules based on the alternating-current and direct-current sampling unit to perform PI control, and the alternating-current voltage is stabilized; the control method comprises the following steps of adopting an alternating voltage outer ring and a current inner ring for control: the voltage command is used as the input of a d axis of a voltage outer ring after per unit, the input of a q axis is 0, alternating voltage is used as the feedback of the voltage outer ring after dq conversion, and the output of the voltage outer ring is used as the input of a current inner ring after PI regulation.
Further, in a constant power mode in a grid-connected scene and an off-grid operation mode in an island scene, the method for executing direct current bipolar voltage-sharing control includes the following steps: and a direct current voltage PI control loop is added, the input of the direct current voltage PI control loop is half bus voltage, the direct current voltage is fed back to the module side, and the output is added into the current inner loop as disturbance quantity.
The technical scheme of the invention has the following beneficial technical effects:
the AC side of the interface converter is connected with an AC sub-network through an isolation transformer and can be connected with an AC load and an AC power supply; the direct current side connects the direct current voltage of +/-375V, and can be connected with power supply equipment such as energy storage equipment, photovoltaic equipment and the like. And the direct current load with the same voltage level can be directly connected without being converted by a DC/DC converter. In an island mode, the AC/DC hybrid microgrid interface converter can work in an AC voltage source mode, and provides energy for the AC sub-network through photovoltaic, energy storage and the like on the DC sub-network. Therefore, the AC/DC hybrid microgrid interface converter can meet the energy mutual aid in different operation modes and the direct access of an AC/DC power supply and a load. The method has important engineering practical application value in distribution of the AC/DC distribution network.
Drawings
Fig. 1 is a schematic diagram of an ac/dc microgrid interface converter provided in an embodiment of the present invention;
fig. 2 is a schematic diagram of an ac/dc microgrid interface converter connected to an applicable microgrid system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic diagram of an ac/dc microgrid interface converter according to an embodiment of the present invention. Fig. 2 is a schematic diagram of an ac/dc microgrid interface converter connected to a microgrid system according to an embodiment of the present invention.
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides an ac/dc microgrid interface converter, which includes a main control unit, two power modules, and an ac/dc sampling unit.
Alternating current sides of two power modules of the alternating current-direct current micro-grid interface converter are connected together through a double-split transformer, and alternating current output electrical isolation is achieved. The direct current side of the alternating current-direct current micro-grid interface converter is characterized in that the negative electrode of the No. 1 power module is connected with the positive electrode of the No. 2 power module to serve as an N electrode, and a positive and negative bipolar direct current bus is formed.
The alternating current and direct current sampling unit collects current and voltage of an alternating current side and a direct current side of the power module and feeds the current and voltage back to the main control unit.
And the main control unit performs mode switching control and controls the conduction time of the switching tubes of the two power modules.
Further, the dc microgrid interface converter main control unit can be set according to different working scenes, so that the dc microgrid interface converter main control unit can work in different modes, including: a voltage stabilization mode in a grid-connected scene, a constant current or constant power mode in a grid-connected scene, and an off-grid operation mode in an island scene.
(1) The alternating current-direct current microgrid interface converter works in a voltage stabilization mode in a grid-connected scene, the alternating current-direct current microgrid interface converter serves as a voltage source, the two modules stabilize voltage 375V respectively, and the power of the converter is related to the size of a direct current load, energy storage and photovoltaic output. Specifically, a control mode of adding a direct-current voltage outer ring and an alternating-current voltage inner ring can be adopted, the input of the direct-current voltage outer ring is 375V, and the feedback is the module direct-current side voltage collected by the alternating-current and direct-current sampling unit. .
(2) The constant current mode working under the grid-connected scene comprises the following steps: the AC/DC hybrid microgrid interface converter is used as a current source, the two power modules realize energy transfer between the AC/DC sub-networks, and the main control unit carries out PI regulation on the switch tube conduction time of the two power modules based on the AC/DC sampling unit feeding back the magnitude of the AC current input by the two power modules, so that the AC current output by the two power modules reaches the AC value corresponding to the set DC constant current value, and is output in a constant current mode.
(3) The constant power mode working under the grid-connected scene comprises the following steps: the AC-DC hybrid microgrid interface converter is used as a current source, the two power modules realize energy transfer between an AC sub-network and a DC sub-network, the AC side voltages of the two power modules are constant values, the main control unit calculates the input power based on the AC-DC sampling unit and the AC current input by the two power modules, obtains the output power of the two power modules based on the corresponding relation between the input power and the output power, and carries out PI regulation on the switch-on time of the switch tubes of the two power modules based on the output power so that the output power of the two power modules reaches a set power value and constant power is output.
(4) The off-grid operation mode working in an island scene comprises the following steps: the main control unit carries out PI control based on the size that two power module input alternating voltage were fed back to the alternating current-direct current sampling unit, stabilizes alternating voltage, adopts alternating voltage outer loop + electric current inner loop: the voltage command is used as the input of a d axis of a voltage outer ring after per unit, the input of a q axis is 0, alternating-current voltage is used as the feedback of the voltage outer ring after dq conversion, the output of the voltage outer ring is used as the input of a current inner ring after PI regulation, and the phase-locked angle is the angle generated by a controller.
When the alternating current side loses power, the alternating current-direct current hybrid micro-grid interface converter serves as an alternating current power supply to supply power to an alternating current load in an island mode, and the voltage of a direct current bus is stabilized by the interface converter. At the moment, the power of the hybrid microgrid interface converter is mainly determined by the size of the alternating current load. The load energy is provided by direct current energy storage or photovoltaic DCDC.
When the interface converter works in a power control mode and an island control mode, the voltage between direct-current bipolar voltages is still balanced when the direct-current bipolar electrodes are connected with unbalanced loads through a direct-current bipolar voltage-sharing control strategy, and the carrying of a direct-current side belt of the hybrid micro-grid interface converter is not influenced. The direct current bipolar voltage-sharing control comprises the steps that a direct current voltage PI control loop is added in a control system, the input of the direct current voltage PI control loop is half bus voltage, the feedback is direct current voltage on the side of a module, and the output is added into a current inner loop as a disturbance quantity.
Optionally, the power module is a common three-phase power module. Preferably, the power module adopts a three-level topology.
Optionally, the control architecture adopts a direct-current voltage outer ring + a current inner ring, wherein the instruction value of the direct-current voltage outer ring is a unipolar bus voltage value;
the embodiment of the invention aims to protect an AC/DC hybrid microgrid interface converter and a control method. The alternating current side of the converter is connected with an alternating current sub-network through an isolation transformer, and the direct current side is connected with +/-375V direct current voltage in a grid-connected mode, so that the converter can be connected with power supply equipment such as energy storage equipment, photovoltaic equipment and the like. And the direct current load with the same voltage level can be directly connected without being converted by a DC/DC converter. The AC/DC hybrid microgrid interface converter can work in an AC voltage source mode under an island mode, and provides energy for an AC subnet through photovoltaic, energy storage and the like on the DC subnet. Therefore, the AC/DC hybrid microgrid interface converter can meet the energy mutual aid in different operation modes and the direct access of an AC/DC power supply and a load. The method has important engineering practical application value in distribution of the AC/DC distribution network.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. An AC/DC hybrid microgrid interface converter is characterized by comprising a main control unit, two power modules and an AC/DC sampling unit;
the alternating current sides of the two power modules are connected with an alternating current sub-network after being connected together through a double-split transformer; the negative electrode of the first power module at the direct current side of the two power modules is connected with the positive electrode of the second power module to be used as an N electrode, so that a positive and negative bipolar direct current bus is formed;
the alternating current and direct current sampling unit collects current and voltage at the alternating current side and the direct current side of the power module and feeds the current and voltage back to the main control unit;
the main control unit controls the two power modules, so that the alternating-current/direct-current hybrid micro-grid interface converter works in a voltage stabilization mode in a grid-connected scene, a constant-current or constant-power mode in the grid-connected scene and an off-grid operation mode in an island scene.
2. The AC-DC hybrid microgrid interface converter according to claim 1, characterized in that, when operating in a voltage stabilization mode in a grid-connected scene, the converter comprises: the AC-DC hybrid microgrid interface converter is used as a voltage source, the two power modules convert alternating current into direct current for output, and the main control unit carries out PI (proportional integral) regulation on the two power modules based on the magnitude of the direct current voltage output by the two power modules fed back by the AC-DC sampling unit, so that the direct current voltage output by the two power modules reaches a set constant voltage value and is output at a constant voltage.
3. The ac-dc hybrid microgrid interface converter according to claim 2, wherein when the ac-dc hybrid microgrid interface converter is used as a voltage source, the two power modules are respectively regulated to 375V.
4. The AC-DC hybrid microgrid interface converter according to claim 1, characterized in that, when operating in a constant current mode in a grid-connected scene, the converter comprises: the AC/DC hybrid microgrid interface converter is used as a current source, the two power modules realize energy transfer between the AC/DC sub-networks, and the main control unit performs PI regulation on the two power modules based on the AC/DC sampling unit for feeding back the magnitude of AC current input by the two power modules, so that the AC current output by the two power modules reaches a set value and is output in a constant current mode.
5. The ac-dc hybrid microgrid interface converter according to claim 1, operating in a constant power mode in a grid-connected scene, comprising: the AC/DC hybrid microgrid interface converter is used as a current source, the two power modules realize energy transfer between an AC/DC sub-network, the main control unit calculates the input power based on the AC/DC sampling unit feeding back the input alternating current of the two power modules, obtains the output power of the two power modules based on the corresponding relation between the input power and the output power, and performs PI regulation on the two power modules based on the output power so that the output power of the two power modules reaches a set power value and constant power is output.
6. The AC-DC hybrid microgrid interface converter according to claim 1, characterized in that an off-grid operation mode working in an island scene comprises: the main control unit feeds back the magnitude of the input alternating-current voltage of the two power modules based on the alternating-current and direct-current sampling unit to perform PI control, and the alternating-current voltage is stabilized; the control method comprises the following steps of adopting an alternating voltage outer ring and a current inner ring for control: the voltage command is used as the input of a d axis of a voltage outer ring after per unit, the input of a q axis is 0, alternating voltage is used as the feedback of the voltage outer ring after dq conversion, and the output of the voltage outer ring is used as the input of a current inner ring after PI regulation.
7. The AC-DC hybrid microgrid interface converter according to claim 1, characterized in that a DC bus is connected with a DC sub-network, and the DC sub-network can be connected with a photovoltaic power generation module, an energy storage module and a charging pile device.
8. The AC-DC hybrid microgrid interface converter according to claim 6, characterized in that in a constant power mode in a grid-connected scene and an off-grid operation mode in an island scene, DC bipolar voltage-sharing control is required, comprising: the main control unit is provided with a direct current voltage PI control loop, the input of the direct current voltage PI control loop is half bus voltage, the feedback is direct current voltage at the side of the module, and the output is added into the current inner loop as disturbance quantity.
9. A method for controlling the ac/dc hybrid microgrid interface converter according to any one of claims 1 to 8, comprising:
selecting a working mode:
if a voltage stabilization mode working in a grid-connected scene is selected, the AC/DC hybrid microgrid interface converter is controlled to serve as a voltage source, the two power modules convert AC into DC for output, and the main control unit performs PI regulation on the two power modules based on the magnitude of the DC voltage output by the two power modules fed back by the AC/DC sampling unit, so that the DC voltage output by the two power modules reaches a set constant voltage value and is output at a constant voltage;
if a constant current mode working in a grid-connected scene is selected, the AC/DC hybrid microgrid interface converter is controlled to serve as a current source, the two power modules realize energy transfer between the AC/DC sub-networks, and the main control unit performs PI regulation on the two power modules based on the AC/DC sampling unit which feeds back the magnitude of AC current input by the two power modules, so that the AC current output by the two power modules reaches a set value and is output in a constant current mode;
if a constant power mode working in a grid-connected scene is selected, the AC/DC hybrid microgrid interface converter is controlled to serve as a current source, the two power modules realize energy transfer between an AC/DC sub-network, the main control unit calculates the input power based on the AC/DC sampling unit and the AC current input by the two power modules, obtains the output power of the two power modules based on the corresponding relation between the input power and the output power, and performs PI (proportional integral) regulation on the two power modules based on the output power so that the output power of the two power modules reaches a set power value and constant power is output;
if the off-grid operation mode working in an island scene is selected, the method comprises the following steps: the main control unit feeds back the magnitude of the input alternating-current voltage of the two power modules based on the alternating-current and direct-current sampling unit to perform PI control, and the alternating-current voltage is stabilized; the control method comprises the following steps of adopting an alternating voltage outer ring and a current inner ring for control: the voltage command is used as the input of a d axis of a voltage outer ring after per unit, the input of a q axis is 0, alternating voltage is used as the feedback of the voltage outer ring after dq conversion, and the output of the voltage outer ring is used as the input of a current inner ring after PI regulation.
10. The control method according to claim 9,
in a constant power mode in a grid-connected scene and an off-grid operation mode in an island scene, executing direct current bipolar voltage-sharing control, and comprising the following steps: and a direct current voltage PI control loop is added, the input of the direct current voltage PI control loop is half bus voltage, the direct current voltage is fed back to the module side, and the output is added into the current inner loop as disturbance quantity.
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