CN113131512B - AC-DC hybrid micro-grid switching control system and method based on optical storage - Google Patents
AC-DC hybrid micro-grid switching control system and method based on optical storage Download PDFInfo
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- CN113131512B CN113131512B CN202110319027.7A CN202110319027A CN113131512B CN 113131512 B CN113131512 B CN 113131512B CN 202110319027 A CN202110319027 A CN 202110319027A CN 113131512 B CN113131512 B CN 113131512B
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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
- H02J3/381—Dispersed generators
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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
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J4/00—Circuit arrangements for mains or distribution networks not specified as ac or dc
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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
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses an alternating current-direct current hybrid microgrid switching control system and method based on light storage, wherein the control system comprises a control unit, a photovoltaic power generation module, a battery energy storage module, an alternating current-direct current load, an IGBT (insulated gate bipolar transistor) driving circuit, a switch module and an alternating current power grid, wherein the photovoltaic power generation module comprises a photovoltaic panel, a first isolation bidirectional DC/DC circuit, a first inverter bridge circuit, a first LC (inductance-capacitance) filter circuit and a first contactor unit which are sequentially and electrically connected; the battery energy storage module comprises a battery, a second isolation bidirectional DC/DC circuit, a first inverter bridge circuit, a second LC filter circuit and a second contactor unit which are electrically connected in sequence; the first isolation bidirectional DC/DC circuit, the second isolation bidirectional DC/DC circuit, the IGBT driving circuit and the switch module are all connected to the control unit; and the control unit performs grid-connected and off-grid control operation on the mixed micro-grid through the IGBT driving circuit and the switch module. The invention is not only an alternating current microgrid but also a direct current microgrid, and can automatically switch the type of a microgrid system according to the requirements of alternating current and direct current loads.
Description
Technical Field
The invention belongs to the technical field of power control, and particularly relates to a hybrid microgrid switching control system and method based on optical storage alternating current and direct current.
Background
With the trend that renewable energy has become a global energy strategic development, the microgrid technology is used as a most important means for improving the effectiveness and reliability of the renewable energy, and the access problem of the renewable energy can be solved by utilizing the microgrid technology. With the rapid development of ac/dc power supplies and ac/dc loads, it is important to efficiently utilize the ac/dc loads. In the smart grid and digital era, a single alternating current micro-grid system or a single direct current micro-grid system has shown obvious defects in energy utilization rate and control energy efficiency. Under the background, the characteristics of an alternating current micro-grid and a direct current micro-grid are considered, and the alternating current and direct current hybrid micro-grid system is generated at the same time and is necessarily the mainstream of future micro-grid technology development.
Based on photovoltaic power generation and battery energy storage, when the alternating current power grid is connected to the grid and is disconnected from the grid, the switching and control of the alternating current micro-grid system and the direct current micro-grid system can be realized by correspondingly controlling the photovoltaic power generation module and the inverter bridge switching device in the energy storage system, and corresponding electric energy is provided for alternating current and direct current loads to normally operate.
The prior art is that a single alternating current micro-grid system or a direct current micro-grid system already shows obvious defects in energy utilization rate and control. The method is particularly characterized in that only a single alternating current load or a single direct current load can be supplied with electric energy in a single alternating current micro-grid or a single direct current micro-grid, and the alternating current micro-grid and the direct current micro-grid cannot be switched at any time according to a corresponding control strategy, so that the energy supply requirements of different loads are met, and the low energy utilization rate and the lack of control energy efficiency are caused.
Disclosure of Invention
The following presents a simplified summary of embodiments of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that the following summary is not an exhaustive overview of the invention. It is not intended to determine the key or critical elements of the present invention, nor is it intended to limit the scope of the present invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.
Aiming at the defects of the prior art, the invention provides a small-sized microgrid system formed on the basis of photovoltaic, energy storage and alternating current and direct current loads, when the microgrid system is connected with and disconnected from an alternating current large power grid, a photovoltaic power generation module and an IGBT of an inverter bridge circuit in the energy storage system are subjected to corresponding control strategies, and three-phase alternating current in the same phase with the alternating current power grid or direct current for running of the direct current loads can be output, namely the rapid switching of the alternating current and direct current microgrids is completed according to the requirements of the alternating current and direct current loads.
According to an aspect of the application, a switching control system based on a light storage alternating current-direct current hybrid microgrid is provided, and the system comprises a control unit A0, a photovoltaic power generation module, a battery energy storage module, an alternating current-direct current load, an IGBT driving circuit A2, a switch module and an alternating current power grid A8 (or alternating current large power grid), wherein the photovoltaic power generation module and the battery energy storage module are connected to the alternating current power grid A8 through the switch module. The photovoltaic power generation module comprises a photovoltaic panel (photovoltaic PV), a first isolation bidirectional DC/DC circuit A1, a first inverter bridge circuit G1, a first LC filter circuit G2 and a first contactor unit which are electrically connected in sequence; the battery energy storage module comprises a battery A3 (which can also be other energy storage components), a second isolation bidirectional DC/DC circuit A4, a second inverter bridge circuit G3, a second LC filter circuit and a second contactor unit which are electrically connected in sequence; the alternating current load and the direct current load comprise an alternating current load, a direct current load and a third contactor unit, and the alternating current load and the direct current load are connected to an alternating current power grid A8 through the third contactor unit through a switch module; the first isolation bidirectional DC/DC circuit A1, the second isolation bidirectional DC/DC circuit A4, the IGBT driving circuit A2 and the switch module are all connected to the control unit A0; and the control unit A0 performs grid-connected and off-grid control operation on the mixed micro-grid through the IGBT driving circuit A2 and the switch module.
In the photovoltaic power generation module, a photovoltaic panel outputs direct current to a first inverter bridge circuit G1 through a first isolation bidirectional DC/DC circuit A1, and then outputs power to a bus through a first LC filter circuit G2. The battery energy storage module is characterized in that a battery A3 outputs direct current to a second inverter bridge circuit through a second isolation bidirectional DC/DC circuit A4, and power is output to a bus through a second LC filter circuit. The IGBT driving circuit A2 is composed of special IGBT driving parts and is controlled by a control unit A0 to output driving signals to the IGBT to be conducted or cut off under the control of high and low levels.
The output three-phase alternating current bus L1-L3 (alternating current bus L1, alternating current bus L2 and alternating current bus L3) of the photovoltaic power generation module is connected to an alternating current power grid A8 through a switch module, concretely, a first inverter bridge circuit G1 is a three-phase full-bridge inverter circuit formed by connecting 6 switch tube strings in parallel, a first LC filter circuit G2 is a three-phase bridge rectifier formed by connecting three inductors and three capacitors in series in parallel, a first contactor unit comprises a first contactor J1, a second contactor J2 and a third contactor J3, each phase of the three-phase full-bridge inverter circuit and the three-phase bridge rectifier are respectively connected in series, the first phase of the series connection is connected with the first contactor J1 and is connected with the alternating current bus L1, the second phase of the series connection is connected with the second contactor J2 and is connected with the alternating current bus L2, and the third phase of the series connection is connected with the third contactor J3 and is connected with the alternating current bus L3.
Specifically, the three-phase bridge rectifier comprises 6 switching tubes, which are marked as a first switching tube (Q1), a second switching tube (Q2), a third switching tube (Q3), a fourth switching tube (Q4), a fifth switching tube (Q5) and a sixth switching tube (Q6), wherein the first switching tube (Q1), the second switching tube (Q2), the third switching tube (Q3), the fourth switching tube (Q4), the fifth switching tube (Q5) and the sixth switching tube (Q6) form a three-phase full-bridge inverter circuit, the first switching tube (Q1) and the second switching tube (Q2) are connected in series to form an A-phase bridge arm, the third switching tube (Q3) and the fourth switching tube (Q4) are connected in series to form a B-phase bridge arm, and the fifth switching tube (Q5) and the sixth switching tube (Q6) are connected in series to form a C-phase bridge arm; the first switching tube (Q1), the third switching tube (Q3) and the fifth switching tube (Q5) can select NPN type triodes, and the second switching tube (Q2), the fourth switching tube (Q4) and the sixth switching tube (Q6) can select PNP type triodes.
The output three-phase alternating current bus L4-L6 (alternating current bus L4, alternating current bus L5 and alternating current bus L6) of the battery energy storage module is connected to an alternating current power grid A8 through a switch module, concretely, the second inverter bridge circuit is a three-phase full bridge inverter circuit formed by connecting 6 switch tube strings in parallel, the second LC filter circuit is a three-phase bridge rectifier formed by connecting three inductors and three capacitors in series and in parallel, the second contactor unit comprises a fourth contactor J4, a fifth contactor J5 and a sixth contactor J6, each phase of the three-phase full bridge inverter circuit and each phase of the three-phase bridge rectifier are respectively connected in series, the first phase after series connection is connected with the fourth contactor J4 in series and is connected with the alternating current bus L4, the second phase after series connection is connected with the fifth contactor J5 in series and is connected with the alternating current bus L5, and the third phase after series connection is connected with the sixth contactor J6 in series and is connected with the alternating current bus L6.
Similarly, the second inverter bridge circuit comprises a seventh switch tube, an eighth switch tube, a ninth switch tube, a tenth switch tube, an eleventh switch tube and a twelfth switch tube, wherein the seventh switch tube, the eighth switch tube, the ninth switch tube, the tenth switch tube, the eleventh switch tube and the twelfth switch tube form a three-phase full-bridge inverter circuit, the seventh switch tube and the eighth switch tube are connected in series to form an a-phase bridge arm, the ninth switch tube and the tenth switch tube are connected in series to form a B-phase bridge arm, and the eleventh switch tube and the twelfth switch tube are connected in series to form a C-phase bridge arm; the seventh switching tube, the ninth switching tube and the eleventh switching tube are NPN type triodes, and the eighth switching tube, the tenth switching tube and the twelfth switching tube are PNP type triodes.
The switch module comprises a thyristor S1 and a switch S2 which are connected in series, the thyristor S1 and the switch S2 are respectively provided with three switches, each of the three switches of the thyristor S1 and the three switches of the switch S2 are connected in series, and the switch S2 is electrically connected with the control unit A0. Specifically, the ac bus L1 is connected to the phase a of the ac power grid A8 through the thyristor S1 and a first path of the three-way switch of the switch S2, the ac bus L2 is connected to the phase B of the ac power grid A8 through the thyristor S1 and a second path of the three-way switch of the switch S2, and the ac bus L3 is connected to the phase C of the ac power grid A8 through the thyristor S1 and a third path of the three-way switch of the switch S2. Similarly, the ac bus L4 is connected to the phase a of the ac power grid A8 through the thyristor S1 and a first of the three-way switches of the switch S2, the ac bus L5 is connected to the phase B of the ac power grid A8 through the thyristor S1 and a second of the three-way switches of the switch S2, and the ac bus L6 is connected to the phase C of the ac power grid A8 through the thyristor S1 and a third of the three-way switches of the switch S2.
As a specific scheme, the alternating current and direct current load comprises a charging pile and an electric automobile which are connected in series. The output three-phase alternating current buses L7-L9 (the alternating current bus L7, the alternating current bus L8 and the alternating current bus L9) of the charging pile are connected with an alternating current power grid A8 through a thyristor S1 and a switch S2. The output end of the charging pile is further connected to the alternating-current bus through a third contactor unit and is connected to an alternating-current power grid A8 through the alternating-current bus, specifically, the third contactor unit comprises a seventh contactor J7 and an eighth contactor J8, the output end of the charging pile is connected to an alternating-current bus L10 through the seventh contactor J7, the output end of the charging pile is further connected to an alternating-current bus L11 through the eighth contactor J8, specifically, the alternating-current bus L7 is connected to a phase a of the alternating-current power grid A8 through a thyristor S1 and a first path of three-way switches of a switch S2, the alternating-current bus L8 is connected to a phase B of the alternating-current power grid A8 through a thyristor S1 and a second path of three-way switches of the switch S2, and the alternating-current bus L9 is connected to a phase C of the alternating-current power grid A8 through a thyristor S1 and a third path of three-way switches of the switch S2. The output end of the charging pile is connected with an alternating current bus L10 through a seventh contactor J7, and the alternating current bus L10 is connected to the phase A of an alternating current power grid A8 through a thyristor S1 and a first path of three-way switches of a switch S2; the output end of the charging pile is further connected with an alternating current bus L11 through an eighth contactor J8, and the alternating current bus L11 is connected to the C phase of an alternating current power grid A8 through a thyristor S1 and the third of three-way switches of a switch S2.
According to another aspect of the application, a control method based on the optical storage alternating current-direct current hybrid microgrid switching control system is further provided, and the control method comprises the following processes:
process 1: when an alternating-current micro-grid system is established to supply power for an alternating-current load or is connected with an alternating-current power grid A8 in a grid mode, a switch module is conducted, a first contactor unit is opened, a third contactor unit is disconnected, and a control unit A0 sends out a driving signal to drive a corresponding IGBT through an IGBT driving circuit A2 so as to output three-phase alternating current;
and (2) a process: when the output power of the photovoltaic power generation module is larger than the power consumption of the AC/DC load, the second contactor unit is further opened, and at the moment, the battery energy storage module outputs AC buses L4, L5 and L6 to be respectively and correspondingly connected with the output AC buses L1, L2 and L3 of the photovoltaic power generation module; the control unit A0 controls a seventh switching tube, a ninth switching tube and a twelfth switching tube in the second inverter bridge circuit to be conducted in turn at intervals of preset conduction time and controls the energy transmission direction of the second isolation bidirectional DC/DC circuit A4, so that the control unit supplies power for an AC/DC load and simultaneously transmits redundant power of the photovoltaic power generation module to the battery A3 and stores the redundant power;
and 3, process: establishing a direct current micro-grid system to supply power to a direct current load or disconnecting a switch module when an alternating current power grid A8 loses power; when the control unit A0 sends out a driving signal, the IGBT driving circuit A2 controls the first switching tube and the sixth switching tube of the first inverter bridge circuit G1 to be simultaneously conducted, the first contactor J1 and the third contactor J3 of the first contactor unit are opened, and the second contactor J2 is turned off;
and 4, process: when the direct-current output power of the photovoltaic power generation module is larger than the power consumption requirement of the alternating-current and direct-current load, a fourth contactor J4 and a sixth contactor J6 of the second contactor unit are opened, a fifth contactor J5 is turned off, and a third contactor unit is opened; the control unit A0 sends out a driving signal to control the seventh switching tube and the twelfth switching tube of the second inverter bridge circuit to be simultaneously conducted through the IGBT driving circuit A2 and control the energy transmission direction of the second isolation bidirectional DC/DC circuit A4, and redundant direct-current output power of the photovoltaic power generation module can be transmitted to the battery A3 to be stored.
By the scheme, when the alternating current power grid A8 loses power, the IGBT in the inverter bridge circuit can be controlled to be switched on or switched off through the driving signal, so that the switching control of the alternating current and direct current hybrid micro-grid system is completed; in addition, redundant output electric energy of the photovoltaic power generation module can charge the battery energy storage module, and the battery energy storage module can also output power to an alternating current/direct current load, so that the bidirectional function is realized. Compared with a single alternating current microgrid system or a single direct current microgrid system, the method has the following advantages: 1. the type of the microgrid system can be automatically switched according to the requirements of alternating current and direct current loads, and the microgrid system is an alternating current microgrid and a direct current microgrid; 2. when the alternating current power grid A8 is in power failure, a direct current micro-grid system is formed and supplies power to a direct current load; 3. and the grid-connected operation with the alternating current power grid A8 can be realized, and the power is output to the alternating current load. Meanwhile, redundant energy can be stored for standby application, and the utilization rate of energy is improved, so that the energy utilization rate has very high utilization value; 4. meanwhile, the control logic is simple and effective, and the switching control of the AC and DC micro-grid can be rapidly carried out.
Drawings
The invention may be better understood by referring to the following description in conjunction with the accompanying drawings, in which like reference numerals are used throughout the figures to indicate like or similar parts. The accompanying drawings, which are incorporated in and form a part of this specification, illustrate preferred embodiments of the present invention and, together with the detailed description, serve to further explain the principles and advantages of the invention. In the drawings:
fig. 1 is a system schematic diagram of a control system according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings. The figures and description omit representation and description of components and processes that are not pertinent to the present invention and known to those of ordinary skill in the art. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides a control system and method for switching an alternating current-direct current hybrid microgrid, and aims to ensure reasonable distribution of energy and coordinated operation among alternating current-direct current loads.
Example 1
The embodiment provides an alternating current-direct current hybrid microgrid switching control system based on light storage, refer to fig. 1, and the system comprises a control unit A0, a photovoltaic power generation module, a battery energy storage module, an alternating current-direct current load, an IGBT drive circuit A2, a switch module and an alternating current power grid A8, wherein the photovoltaic power generation module and the battery energy storage module are connected to the alternating current power grid A8 through the switch module.
The photovoltaic power generation module comprises a photovoltaic panel, a first isolation bidirectional DC/DC circuit A1, a first inverter bridge circuit G1, a first LC filter circuit G2 and a first contactor unit which are electrically connected in sequence; the first contactor unit includes a first contactor J1, a second contactor J2, and a third contactor J3.
The battery energy storage module comprises a battery A3 (or other energy storage components), a second isolation bidirectional DC/DC circuit A4, a second inverter bridge circuit G3, a second LC filter circuit G4 and a second contactor unit which are electrically connected in sequence; the second contactor unit includes a fourth contactor J4, a fifth contactor J5, and a sixth contactor J6.
In this embodiment, the ac/dc load includes an ac load, a dc load, and a third contactor unit, and the ac/dc load is connected to the ac power grid A8 through the third contactor unit via the switch module; the third contactor unit includes a seventh contactor J7 and an eighth contactor J8.
The first isolation bidirectional DC/DC circuit A1, the second isolation bidirectional DC/DC circuit A4, the IGBT driving circuit A2 and the switch module are all connected to the control unit A0; and the control unit A0 performs grid-connected and off-grid control operation on the mixed micro-grid through the IGBT drive circuit A2 and the switch module.
In the photovoltaic power generation module, a photovoltaic panel outputs direct current to a first inverter bridge circuit G1 through a first isolation bidirectional DC/DC circuit A1, and then outputs power to a bus through a first LC filter circuit G2. The battery energy storage module is characterized in that a battery A3 outputs direct current to a second inverter bridge circuit through a second isolation bidirectional DC/DC circuit A4, and then power is output to a bus through a second LC filter circuit G4. The IGBT driving circuit A2 is composed of special IGBT driving parts and is controlled by a control unit A0 to output driving signals to the IGBT to be conducted or cut off under the control of high and low levels.
The output three-phase alternating current bus L1-L3 (alternating current bus L1, alternating current bus L2 and alternating current bus L3) of the photovoltaic power generation module is connected to an alternating current power grid A8 through a switch module, concretely, a first inverter bridge circuit G1 is a three-phase full-bridge inverter circuit formed by connecting 6 switch tube strings in parallel, a first LC filter circuit G2 is a three-phase bridge rectifier formed by connecting three inductors and three capacitors in series in parallel, each phase of the three-phase full-bridge inverter circuit and the three-phase bridge rectifier is respectively connected in series, a first phase of the series connection is connected with a first contactor J1 and is connected with the alternating current bus L1, a second phase of the series connection is connected with a second contactor J2 and is connected with the alternating current bus L2, and a third phase of the series connection is connected with a third contactor J3 and is connected with the alternating current bus L3.
The first inverter bridge circuit G1 is a three-phase full-bridge inverter circuit formed by connecting 6 switching tubes in series and in parallel, the 6 switching tubes are marked as a first switching tube (Q1), a second switching tube (Q2), a third switching tube (Q3), a fourth switching tube (Q4), a fifth switching tube (Q5) and a sixth switching tube (Q6), the first switching tube (Q1), the second switching tube (Q2), the third switching tube (Q3), the fourth switching tube (Q4), the fifth switching tube (Q5) and the sixth switching tube (Q6) form the three-phase full-bridge inverter circuit, the first switching tube (Q1) and the second switching tube (Q2) are connected in series to form an A-phase bridge arm, the third switching tube (Q3) and the fourth switching tube (Q4) are connected in series to form a B-phase bridge arm, and the fifth switching tube (Q5) and the sixth switching tube (Q6) are connected in series to form a C-phase bridge arm; the first switching tube (Q1), the third switching tube (Q3) and the fifth switching tube (Q5) can select NPN type triodes, and the second switching tube (Q2), the fourth switching tube (Q4) and the sixth switching tube (Q6) can select PNP type triodes.
An output three-phase alternating current bus L4-L6 (an alternating current bus L4, an alternating current bus L5 and an alternating current bus L6) of the battery energy storage module is connected to an alternating current power grid A8 through a switch module, specifically, a second inverter bridge circuit is a three-phase full bridge inverter circuit formed by connecting 6 switch tube strings in parallel, a second LC filter circuit G4 is a three-phase bridge rectifier formed by connecting three inductors and three capacitors in series, each phase of the three-phase full bridge inverter circuit and the three-phase bridge rectifier are respectively connected in series, a first phase after series connection is connected with a fourth contactor J4 in series and connected with the alternating current bus L4, a second phase after series connection is connected with a fifth contactor J5 in series and connected with the alternating current bus L5, and a third phase after series connection is connected with a sixth contactor J6 in series and connected with the alternating current bus L6.
Similarly, the second inverter bridge circuit comprises a seventh switch tube (Q7), an eighth switch tube (Q8), a ninth switch tube (Q9), a tenth switch tube (Q10), an eleventh switch tube (Q11) and a twelfth switch tube (Q12), the seventh switch tube, the eighth switch tube, the ninth switch tube, the tenth switch tube, the eleventh switch tube and the twelfth switch tube form a three-phase full-bridge inverter circuit, the seventh switch tube and the eighth switch tube are connected in series to form an a-phase bridge arm, the ninth switch tube and the tenth switch tube are connected in series to form a B-phase bridge arm, and the eleventh switch tube and the twelfth switch tube are connected in series to form a C-phase bridge arm; the seventh switching tube, the ninth switching tube and the eleventh switching tube are NPN type triodes, and the eighth switching tube, the tenth switching tube and the twelfth switching tube are PNP type triodes.
The switch module comprises a thyristor S1 and a switch S2 which are connected in series, the thyristor S1 and the switch S2 are respectively provided with three switches, each of the three switches of the thyristor S1 and the three switches of the switch S2 are connected in series, and the switch S2 is electrically connected with the control unit A0. Specifically, the ac bus L1 is connected to the phase a of the ac power grid A8 through the thyristor S1 and a first path of the three-way switch of the switch S2, the ac bus L2 is connected to the phase B of the ac power grid A8 through the thyristor S1 and a second path of the three-way switch of the switch S2, and the ac bus L3 is connected to the phase C of the ac power grid A8 through the thyristor S1 and a third path of the three-way switch of the switch S2. Similarly, the ac bus L4 is connected to the phase a of the ac electrical network A8 through the thyristor S1 and a first of the three-way switches of the switch S2, the ac bus L5 is connected to the phase B of the ac electrical network A8 through the thyristor S1 and a second of the three-way switches of the switch S2, and the ac bus L6 is connected to the phase C of the ac electrical network A8 through the thyristor S1 and a third of the three-way switches of the switch S2.
In this embodiment, the alternating current-direct current load includes electric automobile A7 and fills electric pile, fills electric pile and includes interconnect's DC-DC module A6 and AC-DC module A5, and electric automobile A7 is connected with the DC-DC module A6 who fills electric pile. The AC-DC module A5 of the charging pile outputs three-phase alternating current buses L7-L9 (an alternating current bus L7, an alternating current bus L8 and an alternating current bus L9) which are connected with an alternating current power grid A8 through a thyristor S1 and a switch S2. The DC-DC module A6 output of the charging pile is also connected to the alternating current bus through a third contactor unit and via the alternating current bus to the alternating current grid A8. Specifically, the output end of the charging pile is connected with an alternating current bus L10 through a seventh contactor J7, and the output end of the charging pile is also connected with an alternating current bus L11 through an eighth contactor J8. The alternating current bus L7 is connected to the phase A of the alternating current power grid A8 through the thyristor S1 and the first path of the three-way switch of the switch S2, the alternating current bus L8 is connected to the phase B of the alternating current power grid A8 through the thyristor S1 and the second path of the three-way switch of the switch S2, and the alternating current bus L9 is connected to the phase C of the alternating current power grid A8 through the thyristor S1 and the third path of the three-way switch of the switch S2. The output end of the charging pile is connected with an alternating current bus L10 through a seventh contactor J7, and the alternating current bus L10 is connected to the phase A of an alternating current power grid A8 through a thyristor S1 and a first path of three-way switches of a switch S2; the output end of the charging pile is further connected with an alternating current bus L11 through an eighth contactor J8, and the alternating current bus L11 is connected to the C phase of the alternating current power grid A8 through a thyristor S1 and the third of the three-way switch of the switch S2.
Among the above-mentioned module, photovoltaic power generation module: the photovoltaic panel outputs 750V direct current to the first inverter bridge circuit G1 through the first isolation bidirectional DC/DC circuit A1, and power is output to the bus through the first LC filter circuit G2. The battery energy storage module: the battery A3 outputs 750V direct current to a second inverter bridge circuit G3 through a second isolation bidirectional DC/DC circuit A4, and power is output to the bus through a second LC filter circuit G4; alternating current load and direct current load are respectively formed by the charging pile and the electric automobile A7 in the alternating current and direct current load. The IGBT driving circuit is composed of a special IGBT driving circuit A2, and is controlled by a control unit A0 to output driving signals to the IGBT to be conducted or cut off under the control of high and low levels. In addition, an alternating current power grid A8 is connected with output three-phase alternating current buses L1-L6 of the photovoltaic power generation module and the battery energy storage module through a thyristor S1 and a switch S2 to control grid connection and grid disconnection operations.
Example 2
The embodiment provides an ac/dc hybrid microgrid switching control method based on optical storage, wherein hardware of the method adopts the control system in embodiment 1, the control method executes an ac/dc microgrid automatic switching process, and the specific implementation scheme is as follows:
1) When the microgrid system needs to establish an alternating-current microgrid system to supply power to an alternating-current load or be connected with an alternating-current power grid A8 in a grid mode, the thyristor S1 is turned on, and then the switch S2 is also turned on. The first, second, and third contactors J1, J2, and J3 are also normally opened, and the seventh and eighth contactors J7 and J8 are opened. At the moment, the photovoltaic panel can output 750V direct-current voltage through the first isolating bidirectional DC/DC circuit A1, and the direct-current voltage is transmitted to the following first inverter bridge circuit G1 to be subjected to direct-current inversion and can be converted into three-phase alternating current. According to the classical control mode of a classical three-phase full-bridge circuit, a control unit A0 sends out a driving signal to drive a corresponding IGBT through an IGBT driving circuit A2, and then three-phase alternating current can be output.
After the first switch tube Q1 is controlled to be switched on, the sixth switch tube Q6 is switched on after the interval of the switching-on time of 60 degrees and the switching-on time of Q3 is further switched on after the interval of the switching-on time of 60 degrees. Three-phase alternating current of A, B and C can be output after being conducted in turn at intervals of 60 degrees in sequence, and then is transmitted to alternating current buses L1, L2 and L3 through a first LC filter circuit G2. At the moment of grid connection, three phases A, B and C of an alternating current large power grid A8 are connected with alternating current buses L1, L2 and L3 generated by the photovoltaic power generation modules, namely, the three phases are connected in the same phase, and 380V three-phase alternating current is generated. And meanwhile, the AC-DC module A5 is transmitted to the input end of the AC-DC module A5 of the charging pile, and the AC power is output to the charging pile. The output 750V DC is rectified by the charging pile AC-DC module A5 and then the output 750V DC can be output by the DC-DC module A6 to output proper voltage, so that the electric automobile A7 is supplied with power.
When the output power of the photovoltaic power generation module is greater than the power consumption of the charging pile and the electric vehicle, the contactor switches (the fourth contactor J4, the fifth contactor J5, and the sixth contactor J6) can be opened at this time. The battery energy storage module output alternating current buses L4, L5 and L6 are respectively and correspondingly connected with the output alternating current buses L1, L2 and L3 of the photovoltaic power generation module. The seventh switch tube Q7, the ninth switch tube Q9 and the twelfth switch tube Q12 of the second inverter bridge circuit G3 are controlled by the control unit A0 to be sequentially conducted at intervals of 60 degrees and the energy transmission direction of the second isolation bidirectional DC/DC circuit A4 is controlled, so that the redundant power of the photovoltaic power generation module can be transmitted to the battery A3 while the power is supplied to the alternating current load, and the redundant power is stored.
The system is an alternating current micro-grid system based on light storage and can supply power to alternating current loads.
2) When the microgrid system needs to establish a direct-current microgrid system to supply power to a direct-current load or the alternating-current power grid A8 loses power for some reason, the alternating-current power grid A8 is not supported at the moment. And the thyristor S1 is disconnected, the switch S2 is also disconnected, and the alternating current power grid A8 is separated from the microgrid system. The photovoltaic panel outputs 750VDC through the first isolation bidirectional DC/DC power A1, and when the control unit A0 sends a driving signal to control the first switch tube Q1 and the sixth switch tube Q6 of the first inverter bridge circuit G1 to be conducted simultaneously through the IGBT driving circuit A2, the direct current 750VDC is formed at the nodes A and C of the first LC filter circuit G2. At this time, the first contactor J1 and the third contactor J3 are opened, and the second contactor J2 is closed, so that 750V dc buses of L1 and L3 are formed.
When the direct current output power of the photovoltaic power generation module is larger than the power consumption requirements of the charging pile and the electric automobile, the fourth contactor J4 and the sixth contactor J6 are opened, the fifth contactor J5 is turned off, and contactor switches connected with the charging pile, namely a seventh contactor J7 and an eighth contactor J8, are opened. The dc buses L1, L3 are now connected to L4, L6. A driving signal is sent by the control unit A0, a seventh switching tube Q7 and a twelfth switching tube Q12 of the second inverter bridge circuit G3 are controlled to be conducted at the same time through the control unit A2, the energy transmission direction of the second isolation bidirectional DC/DC circuit A4 is controlled, and redundant direct-current output power of the photovoltaic power generation module can be transmitted to the battery A3 to be stored. And meanwhile, the direct current buses L10 and L11 are connected with the direct current buses L1 and L3, and the direct current buses L4 and L6 of the photovoltaic power generation module and the battery energy storage module. And the direct-current voltage 750VDC on the direct-current bus is directly connected to the input end of the DC-DC module A6, so that the DCDC transformation is completed to supply power to the electric automobile A7.
When the power consumption of the charging pile and the electric automobile is larger than the direct current output power of photovoltaic power generation, the energy stored by the battery energy storage module can be supplemented at the moment. As long as the energy transmission direction of the second isolation bidirectional DC/DC circuit A4 is controlled by the control unit A0, the battery energy storage module and the photovoltaic power generation module can supply power to the charging pile and the electric automobile A7 together.
The system is a direct-current microgrid system based on optical storage and can supply power to direct-current loads.
According to the scheme, when the alternating current power grid A8 loses power, the IGBT in the inverter bridge circuit can be controlled to be switched on or switched off through the driving signal, so that the switching control of the alternating current and direct current hybrid micro-grid system is completed; the redundant output electric energy of photovoltaic power generation module can charge battery energy storage module, and battery energy storage module does output power and gives the alternating current-direct current load, has two-way function, has fine practicality.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.
In addition, the method of the present invention is not limited to be performed in the time sequence described in the specification, and may be performed in other time sequences, in parallel, or independently. Therefore, the order of execution of the methods described in this specification does not limit the technical scope of the present invention.
While the present invention has been disclosed by the description of the specific embodiments thereof, it should be understood that all of the embodiments and examples described above are intended to be illustrative and not restrictive. Various modifications, improvements and equivalents of the invention may be devised by those skilled in the art within the spirit and scope of the appended claims. Such modifications, improvements and equivalents are also intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a based on mixed microgrid switching control system of light storage alternating current-direct current which characterized in that: the photovoltaic power generation system comprises a control unit, a photovoltaic power generation module, a battery energy storage module, an alternating current and direct current load, an IGBT (insulated gate bipolar transistor) driving circuit, a switch module and an alternating current power grid, wherein the photovoltaic power generation module and the battery energy storage module are both connected to the alternating current power grid through the switch module; the photovoltaic power generation module comprises a photovoltaic panel, a first isolation bidirectional DC/DC circuit, a first inverter bridge circuit, a first LC filter circuit and a first contactor unit which are electrically connected in sequence; the battery energy storage module comprises a battery, a second isolation bidirectional DC/DC circuit, a second inverter bridge circuit, a second LC filter circuit and a second contactor unit which are electrically connected in sequence; the alternating current load and the direct current load comprise an alternating current load, a direct current load and a third contactor unit, and the alternating current load and the direct current load are connected to an alternating current power grid through the third contactor unit via a switch module; the first isolation bidirectional DC/DC circuit, the second isolation bidirectional DC/DC circuit, the IGBT driving circuit and the switch module are all connected to the control unit; the control unit performs grid-connection and off-grid control operation on the mixed micro-grid through the IGBT driving circuit and the switch module; the alternating current and direct current load comprises a charging pile, the charging pile comprises a DC-DC module and an AC-DC module which are mutually connected, and an output three-phase alternating current bus of the AC-DC module is connected with an alternating current power grid; the third contactor unit includes a seventh contactor J7 and an eighth contactor J8; a first end of the seventh contactor J7 is connected to one of connection ends of the DC-DC module and the AC-DC module, a second end of the seventh contactor J7 is connected to the a-phase of the alternating current grid through an alternating current bus L10, a first end of the eighth contactor J8 is connected to the other connection end of the DC-DC module and the AC-DC module, and a second end of the eighth contactor J8 is connected to the C-phase of the alternating current grid through an alternating current bus L11.
2. The AC-DC hybrid microgrid switching control system based on light storage according to claim 1, characterized in that: an output three-phase alternating current bus of the photovoltaic power generation module is connected to an alternating current power grid through a switch module; recording output three-phase alternating current buses of the photovoltaic power generation module as an alternating current bus L1, an alternating current bus L2 and an alternating current bus L3; first inverter bridge circuit is the three-phase full-bridge inverter circuit that 6 switch tube strings connect in parallel and constitute, first LC filter circuit is three inductance and three electric capacity strings and connects in parallel the three-phase bridge rectifier who constitutes, first contactor unit includes first contactor J1, second contactor J2 and third contactor J3, each looks of three-phase full-bridge inverter circuit and three-phase bridge rectifier concatenates respectively, and wherein the first contactor J1 that concatenates after concatenating concatenates mutually concatenates first contactor J1 and is connected with alternating current generating line L1, and wherein the second phase after establishing ties second contactor J2 and is connected with alternating current generating line L2, and wherein the third phase after establishing ties third contactor J3 and is connected with alternating current generating line L3.
3. The AC-DC hybrid microgrid switching control system based on optical storage according to claim 2, characterized in that: the first inverter bridge circuit comprises 6 switching tubes which are marked as a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube, wherein the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube form a three-phase full-bridge inverter circuit; the first switching tube, the third switching tube and the fifth switching tube are NPN type triodes, and the second switching tube, the fourth switching tube and the sixth switching tube are PNP type triodes.
4. The AC-DC hybrid microgrid switching control system based on optical storage according to claim 2, characterized in that: the output three-phase alternating-current bus of the battery energy storage module is connected to an alternating-current power grid through a switch module, and the output three-phase alternating-current bus of the battery energy storage module is marked as an alternating-current bus L4, an alternating-current bus L5 and an alternating-current bus L6; the second inverter bridge circuit is a three-phase full-bridge inverter circuit formed by connecting 6 switching tubes in series and in parallel, the second LC filter circuit is a three-phase bridge rectifier formed by connecting three inductors and three capacitors in series and in parallel, the second contactor unit comprises a fourth contactor J4, a fifth contactor J5 and a sixth contactor J6, each phase of the three-phase full-bridge inverter circuit of the second inverter bridge circuit and the three-phase bridge rectifier of the second LC filter circuit is respectively connected in series, the first phase of the series connection is connected with the fourth contactor J4 and is connected with an alternating current bus L4, the second phase of the series connection is connected with the fifth contactor J5 and is connected with the alternating current bus L5, and the third phase of the series connection is connected with the sixth contactor J6 and is connected with the alternating current bus L6;
the second inverter bridge circuit comprises a seventh switch tube, an eighth switch tube, a ninth switch tube, a tenth switch tube, an eleventh switch tube and a twelfth switch tube, wherein the seventh switch tube, the eighth switch tube, the ninth switch tube, the tenth switch tube, the eleventh switch tube and the twelfth switch tube form a three-phase full-bridge inverter circuit; the seventh switching tube, the ninth switching tube and the eleventh switching tube are NPN type triodes, and the eighth switching tube, the tenth switching tube and the twelfth switching tube are PNP type triodes.
5. The AC-DC hybrid microgrid switching control system based on light storage according to claim 4, characterized in that: the switch module comprises a thyristor S1 and a switch S2 which are connected in series, the thyristor S1 and the switch S2 are respectively provided with three switches, each of the three switches of the thyristor S1 and the three switches of the switch S2 are connected in series, and the switch S2 is electrically connected with the control unit; the alternating-current bus L1 is connected to the phase A of the alternating-current power grid through the thyristor S1 and a first path of the three-way switch of the switch S2, the alternating-current bus L2 is connected to the phase B of the alternating-current power grid through the thyristor S1 and a second path of the three-way switch of the switch S2, and the alternating-current bus L3 is connected to the phase C of the alternating-current power grid through the thyristor S1 and a third path of the three-way switch of the switch S2; similarly, the ac bus L4 is connected to the phase a of the ac power grid through the thyristor S1 and a first path of the three-way switch of the switch S2, the ac bus L5 is connected to the phase B of the ac power grid through the thyristor S1 and a second path of the three-way switch of the switch S2, and the ac bus L6 is connected to the phase C of the ac power grid through the thyristor S1 and a third path of the three-way switch of the switch S2.
6. The AC-DC hybrid microgrid switching control system based on optical storage according to claim 5, characterized in that: the alternating current and direct current load also comprises an electric automobile connected with the charging pile in series.
7. The AC-DC hybrid microgrid switching control system based on light storage according to claim 6, characterized in that: the output three-phase alternating-current bus of the charging pile is connected with an alternating-current power grid through a thyristor S1 and a switch S2, and the output three-phase alternating-current bus of the charging pile is marked as an alternating-current bus L7, an alternating-current bus L8 and an alternating-current bus L9; the output end of the charging pile is also connected to an alternating current bus through a third contactor unit and is connected to an alternating current power grid through the alternating current bus; the alternating-current bus L7 is connected to the phase A of the alternating-current power grid through the thyristor S1 and a first path of the three-way switch of the switch S2, the alternating-current bus L8 is connected to the phase B of the alternating-current power grid through the thyristor S1 and a second path of the three-way switch of the switch S2, and the alternating-current bus L9 is connected to the phase C of the alternating-current power grid through the thyristor S1 and a third path of the three-way switch of the switch S2; the output end of the charging pile is connected with an alternating current bus L10 through a seventh contactor J7, and the alternating current bus L10 is connected to the phase A of the alternating current power grid through a thyristor S1 and a first path of three-way switches of a switch S2; the output end of the charging pile is connected with an alternating current bus L11 through an eighth contactor J8, and the alternating current bus L11 is connected to the C phase of an alternating current power grid through a thyristor S1 and a third path of three-path switches of a switch S2.
8. The control method based on the optical storage alternating current-direct current hybrid microgrid switching control system according to any one of claims 1 to 7, characterized by comprising the following steps: the method comprises the following steps:
process 1: when an alternating-current micro-grid system is established to supply power to an alternating-current load or is connected with an alternating-current power grid in a grid mode, a switch module is conducted, a first contactor unit is opened, a third contactor unit is disconnected, and a control unit sends out a driving signal to drive a corresponding IGBT through an IGBT driving circuit so as to output three-phase alternating current;
and (2) a process: when the output power of the photovoltaic power generation module is larger than the power consumption of the AC/DC load, the second contactor unit is further opened, and at the moment, output AC buses L4, L5 and L6 of the battery energy storage module are respectively and correspondingly connected with output AC buses L1, L2 and L3 of the photovoltaic power generation module; the control unit controls a seventh switching tube, a ninth switching tube and a twelfth switching tube in the second inverter bridge circuit to be conducted in turn at intervals of preset conduction time and controls the energy transmission direction of the second isolation bidirectional DC/DC circuit, so that redundant power of the photovoltaic power generation module is transmitted to the battery and stored while the power is supplied to the AC/DC load;
and (3) a process: establishing a direct current micro-grid system to supply power to a direct current load or disconnecting a switch module when an alternating current power grid loses power; when the control unit sends a driving signal, the IGBT driving circuit controls a first switching tube and a sixth switching tube of the first inverter bridge circuit to be simultaneously conducted, a first contactor J1 and a third contactor J3 of the first contactor unit are opened, and a second contactor J2 is turned off;
and 4, process: when the direct-current output power of the photovoltaic power generation module is larger than the power consumption requirement of the alternating-current and direct-current load, a fourth contactor J4 and a sixth contactor J6 of the second contactor unit are opened, a fifth contactor J5 is turned off, and a third contactor unit is opened; the control unit sends out a driving signal to control a seventh switching tube and a twelfth switching tube of the second inverter bridge circuit to be simultaneously conducted through the IGBT driving circuit and control the energy transmission direction of the second isolation bidirectional DC/DC circuit, and redundant direct current output power of the photovoltaic power generation module can be transmitted to the battery to be stored.
9. The control method according to claim 8, characterized in that: specifically, turning on the switch module in the process 1 includes: the thyristor S1 is first turned on and then the switch S2 is turned on.
10. The control method according to claim 8, characterized in that: in the process 1, the step of sending a driving signal by the control unit to drive the corresponding IGBT through the IGBT driving circuit to output three-phase alternating current specifically comprises the following steps: after controlling the first switching tube to be conducted, the control unit opens the third switching tube after a preset conducting time interval, and opens the sixth switching tube Q6 after a preset conducting time interval; the three-phase alternating current of A, B and C can be output after being conducted in turn at intervals of preset conducting time in sequence, and then is transmitted to alternating current buses L1, L2 and L3 through a first LC filter circuit.
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Effective date of registration: 20221206 Address after: 518000 electric power dispatching and communication building, 4020 Shennan East Road, Luohu District, Shenzhen, Guangdong Applicant after: SHENZHEN POWER SUPPLY BUREAU Co.,Ltd. Address before: 518000 electric power dispatching and communication building, 4020 Shennan East Road, Luohu District, Shenzhen, Guangdong Applicant before: SHENZHEN POWER SUPPLY BUREAU Co.,Ltd. Applicant before: CYG SUNRI Co.,Ltd. |
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