WO2019007135A1 - 一种链式多端口并网接口装置及控制方法 - Google Patents
一种链式多端口并网接口装置及控制方法 Download PDFInfo
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- WO2019007135A1 WO2019007135A1 PCT/CN2018/083773 CN2018083773W WO2019007135A1 WO 2019007135 A1 WO2019007135 A1 WO 2019007135A1 CN 2018083773 W CN2018083773 W CN 2018083773W WO 2019007135 A1 WO2019007135 A1 WO 2019007135A1
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000003993 interaction Effects 0.000 claims abstract description 45
- 238000004146 energy storage Methods 0.000 claims abstract description 16
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- 238000002955 isolation Methods 0.000 description 2
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Classifications
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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
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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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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- 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
- H02J2300/28—The renewable source being wind 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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- 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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/10—The network having a local or delimited stationary reach
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/0074—Plural converter units whose inputs are connected in series
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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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
Definitions
- the invention belongs to the field of power electronic converters, and in particular relates to a multi-port grid-connecting device and a control method for a chain structure.
- the DC bus is usually medium voltage. For example, 35kV/10kV, and the distributed power supply has a voltage range of 200 to 1000V.
- a high-ratio DC transformer or a high-ratio AC/DC converter is required, and the cost is high.
- the disadvantage is that when the DC bus fails or the device hanging on the DC bus fails, the device with the bus will be affected.
- the DC breaker needs to be configured to isolate the fault.
- Figure 1-8 shows the structure of a converter that converts from high-voltage AC to low-voltage DC.
- the main advantage of this topology is to avoid the use of high-voltage DC busses and eliminate the need for a large number of high-ratio converters. It is equivalent to replacing a large number of small-capacity converters with a large-capacity converter, but the topology can only provide a low-voltage DC port, and the low-voltage AC port needs to pass through a DC/AC converter, as shown in Figure 1-7.
- the DC port can constitute a DC bus
- the AC port constitutes an AC bus
- a large amount of distributed power is connected to the DC port through the converter.
- the main drawbacks of this structure are: (1) The structure is complicated: The main function of the converter of Figure 1-8 is to provide the DC bus port. The converter itself has a high complexity, and the rear stage of the chain structure requires a large amount of DC/DC. Inverter, the output side of the converter is directly connected in parallel, and the control complexity is high. The low-voltage AC bus port is inverted by the DC bus port. The electric energy is derived from the DC bus, which occupies the power capacity of the DC bus, and the AC and DC power. It is not completely decoupled, and it also increases the difficulty of coordinated control.
- the essential defect of the prior art is that the single port and the use of a single port to be compatible with different types of units result in high complexity and low cost performance; the above solutions all have a DC bus, the fault is difficult to isolate, and the reliability is low.
- the invention aims to solve the deficiencies of the above solutions, and provides a plurality of independent ports for the connection of the low-voltage power source, the load and the energy storage unit, so that the low-voltage units are connected to the high-voltage AC power grid with high reliability, thereby realizing plug-and-play. , greatly reducing the difficulty and cost of implementation.
- the present invention provides a chain multi-port grid-connected interface device, which is specifically as follows:
- a chain multi-port grid-connected interface device comprising a commutation chain, the converter chain being composed of at least two sub-module units connected in series, the sub-module unit comprising a power conversion unit and a capacitor, a positive pole and a cathode of the capacitor
- the lead-out is defined as the DC terminal of the sub-module unit.
- One end of the power conversion unit is connected in parallel with the capacitor, and the other end is defined as the AC end of the sub-module unit.
- the AC terminals of each sub-module are connected in an end-to-end manner, and the chain multi-port is connected.
- the network interface device further includes at least one DC converter, at least one DC-DC converter, which converts one DC power into another DC power having different output characteristics, one end of the DC converter and the sub-module unit
- the DC terminal is connected, and the other end is defined as a DC interaction port of the grid connection device.
- the DC-DC converter can convert DC power into AC power, and the DC power connection end of the DC-DC converter is connected to the DC terminal of the sub-module unit.
- the AC connection is defined as the AC interaction port of the grid connection device.
- the interface device includes a DC terminal of at least one sub-module unit that is not connected to the DC-DC converter, and is not connected to the DC converter, and the idle DC terminal is defined as an alternate port.
- the interface device includes at least two DC interactive ports and at least two AC interactive ports.
- the interface device includes at least two AC interaction ports, the AC interaction port is connected to a multi-winding transformer, and each group of the primary side of the multi-winding transformer is connected to an AC interaction port, and the secondary side of the multi-winding transformer is defined as the first Press the AC port.
- the interface device includes at least two AC interaction ports, the AC interaction ports are connected in series, and the serially connected ports are defined as a second medium voltage AC port.
- the interface device includes at least two DC interaction ports, and the DC interaction ports are connected in series and are defined as medium voltage DC ports.
- the output voltage amplitude and phase of the AC interaction port in the interface device can be independently adjusted, and the output voltage amplitude of the DC interaction port can be independently adjusted.
- the sub-module unit is an H-bridge power module unit composed of four sets of fully-controlled power semiconductor devices.
- the sub-module unit is a half-bridge power module unit composed of two sets of fully-controlled power semiconductor devices.
- the interface device also includes at least one bypass switch in parallel with the AC terminal of the sub-module unit.
- the interface device also includes at least one DC switch that is connected in series between the sub-module unit and the DC converter or the DC-DC converter.
- the invention also includes a method for controlling a chain multi-port grid-connected interface device.
- the control method includes the following steps:
- the invention also includes a control method for a chain multi-port grid-connected interface device.
- the control method includes the following steps:
- the invention also includes a control method for a chain multi-port grid-connected interface device.
- the control method includes the following steps:
- the invention also includes a control method of a chain multi-port grid-connected interface device, wherein when the DC converter or the DC-DC converter in the device fails, the control method comprises the following steps:
- the invention also includes a system for the chain multi-port grid-connected interface device, the system comprising a chain multi-port grid-connected interface device and five kinds of low voltages of a DC power source, an AC power source, an energy storage unit, a DC load, and an AC load.
- the unit, the interface device comprises an AC interaction port and a DC interaction port connected to at least the two low-voltage units to form a chain multi-port grid connection device system, wherein the DC power source, the energy storage unit, the DC load and the DC interaction port Connection, AC power and AC load are connected to the AC interactive port.
- the invention also includes an inverter comprising the chained multi-port grid-connected interface device, the converter comprising three phases, each phase comprising two upper and lower bridge arms, each bridge arm comprising a reactor and The serial connection of the interface device, the upper and lower bridge arms are combined to form a phase unit, the connection points of the upper and lower bridge arms are midpoints, and the lead ends of the three upper bridge arms are connected together for the commutation
- the positive ends of the three lower arms are connected together, being the negative end of the converter, the midpoint of the three-phase bridge arms of the converter is connected to the grid, and the positive end of the converter is The positive pole of the DC transmission line is connected, and the negative end of the converter is connected to the cathode of the DC transmission line.
- the invention also includes an inverter comprising the chained multi-port grid-connected interface device, the converter comprising three phase units, each phase unit comprising a series connection of an interface device and a reactor, three One ends of the phase units are connected to form a star connection, and the other ends of the three phase units are respectively connected to the three phases of the grid side.
- the invention also includes an inverter comprising the chained multi-port grid-connected interface device, the converter comprising three unit phases, each phase unit comprising a series connection of an interface device and a reactor, three The first and last phases of the phase unit are connected to each other to form an angular connection, and the three connection points of the first and last connections are respectively connected to the three phases of the grid side.
- the DC side of the sub-module unit in the commutation chain is taken out as a grid-connected interface of the low-voltage energy exchange unit, and the DC voltage value of the energy exchange unit is matched with the DC voltage value of the sub-module unit to realize low-voltage DC access.
- the AC side of the sub-module unit in the converter chain realizes the high-voltage output by means of cascading, and the low-voltage DC high-ratio ratio boosting access AC grid is realized by the method, and the high-ratio DC transformer is omitted.
- the grid-connected converter can be constructed by using the grid-connected interface device, such as a static var compensator or a modular multi-level converter.
- the low-voltage unit in the grid-connected device can realize the active power between the grid and the grid.
- the inverter or static var compensator can also perform reactive power compensation, realize decoupling control of active power and reactive power, and maximize equipment utilization.
- the DC interaction interface and the AC interaction interface in the access network interface device may be multiple power sources, loads, and energy storage units.
- the access units for the same converter chain may be different, and the number of configurations may be small.
- the configuration is more flexible, and each unit is independently controlled to realize plug and play.
- the components of the DC distribution network (storage unit, AC power, DC power, AC load, DC load) can be connected through the DC converter and the DC-DC converter in the grid connection device.
- a complete microgrid system is constructed by using a grid-connected interface device. The centralized mode is adopted to facilitate the management and implementation of the control functions of the entire microgrid.
- the present invention configures a bypass switch in the sub-module unit, when the sub-module unit fails, The fault can be bypassed, and the corresponding DC switch can be separated when the DC converter or the DC-DC converter fails, and the fault range can be quickly reduced by the switch.
- the DC converter and the DC-DC converter in the grid-connected interface device can be integrated with the sub-module unit, and the engineering can be realized and space-saving.
- the power semiconductor device and its control loop in the DC converter and the DC-DC converter require an appropriate power supply and can share the energy-receiving loop with the sub-module unit.
- the DC converter and the DC-DC converter can be used without a separate cooling device to share the cooling device with the sub-module unit.
- FIG. 1 is a schematic top view of a chain multi-port grid-connected interface device of the present invention
- FIG. 2 is a topological view of a sub-module unit in the chain multi-port grid-connected interface device of the present invention
- FIG. 3 is an embodiment of a DC/DC converter in a chain multi-port grid-connected interface device of the present invention
- Figure 5 is a first embodiment of the inverter of the present invention.
- Figure 6 is a second embodiment of the inverter of the present invention.
- Figure 7 is a third embodiment of the inverter of the present invention.
- Figure 9 is an embodiment of the present invention under the application scenario 1;
- Figure 10 is an embodiment of the present invention in the application scenario 2;
- a chain multi-port grid-connected interface device includes a converter chain, and the converter chain is composed of at least two sub-module units connected in series, and the sub-module unit includes a power conversion unit and a capacitor.
- the positive and negative terminals of the capacitor are defined as the DC terminal of the sub-module unit.
- One end of the power conversion unit is connected in parallel with the capacitor, and the other end is defined as the AC end of the sub-module unit.
- the AC terminals of each sub-module are connected in an end-to-end manner.
- the chained multi-port grid-connected interface device further includes at least one DC converter, at least one DC-DC converter, which converts one DC power into another DC power with different output characteristics, DC converter One end is connected to the DC end of the sub-module unit, and the other end is defined as a DC interactive port of the grid-connected interface device, the DC-DC converter can convert DC power into AC power, and the DC power connection end and sub-module of the DC-DC converter The DC end of the unit is connected, and the AC line is defined as the AC interactive port of the grid interface device.
- This embodiment includes two DC interactive ports, including two AC interactive ports.
- the topology of the DC converter is shown in Figure 3.
- the topology of the DC-to-AC converter is shown in Figure 4.
- the interface device includes a DC terminal of at least one sub-module unit that is not connected to the DC-DC converter, and is not connected to the DC converter, and the idle DC terminal is defined as an alternate port.
- this implementation includes an alternate port.
- the interface device includes at least two DC interactive ports and at least two AC interactive ports.
- the interface device comprises at least two AC interaction ports, the AC interaction port is connected to the multi-winding transformer, each of the primary sides of the multi-winding transformer is connected with an AC interaction port, and the secondary side of the multi-winding transformer is defined as the first medium voltage AC port.
- the interface device includes at least two AC interaction ports, the AC interaction ports are connected in series, and the serially connected ports are defined as a second medium voltage AC port.
- the interface device includes at least two DC interaction ports, and the DC interaction ports are connected in series and are defined as medium voltage DC ports.
- the output voltage amplitude and phase of the AC interaction port in the interface device can be independently adjusted, and the output voltage amplitude of the DC interaction port can be independently adjusted.
- the sub-module unit is an H-bridge power module unit composed of four sets of fully-controlled power semiconductor devices. As shown in Figure 2 (a).
- the sub-module unit is a half-bridge power module unit composed of two sets of fully-controlled power semiconductor devices. As shown in Figure 2 (b).
- the interface device further includes at least one bypass switch, and the bypass switch is connected in parallel with the AC terminal of the submodule unit.
- the interface device further comprises at least one DC switch connected in series between the submodule unit and the DC converter or the DC-DC converter.
- the invention also includes a method for controlling a chain multi-port grid-connected interface device.
- the control method includes the following steps:
- the invention also includes a control method for a chain multi-port grid-connected interface device.
- the control method includes the following steps:
- the invention also includes a control method for a chain multi-port grid-connected interface device.
- the control method includes the following steps:
- the invention also includes a control method of a chain multi-port grid-connected interface device, wherein when the DC converter or the DC-DC converter in the device fails, the control method comprises the following steps:
- the invention also includes a system for the chain multi-port grid-connected interface device, the system comprising a chain multi-port grid-connected interface device and five kinds of low voltages of a DC power source, an AC power source, an energy storage unit, a DC load, and an AC load.
- the unit, the interface device comprises an AC interaction port and a DC interaction port connected to at least the two low-voltage units to form a chain multi-port grid connection device system, wherein the DC power source, the energy storage unit, the DC load and the DC interaction port Connection, AC power and AC load are connected to the AC interactive port.
- the present invention also includes an inverter including the chained multi-port grid-connected interface device, as shown in FIG. 5, the inverter includes three phases, each phase including upper and lower two bridge arms, each bridge The arm comprises a series connection of a reactor and the interface device, and the upper and lower bridge arms are combined to form a phase unit, the connection points of the upper and lower bridge arms are midpoints, and the outlet ends of the three upper bridge arms are connected together a positive end of the converter; the terminals of the three lower arms are connected together, being the negative end of the converter, and the midpoint of the three-phase bridge arm of the converter is connected to the grid,
- the positive end of the current transformer is connected to the positive pole of the direct current transmission line, and the negative end of the current transformer is connected to the negative pole of the direct current transmission line.
- the present invention also includes an inverter including the chained multi-port grid-connected interface device, as shown in FIG. 6, the inverter includes three phase units, each phase unit including an interface device and a reactor The series connection, one end of the three phase units are connected to form a star connection, and the other ends of the three phase units are respectively connected with the three phases of the grid side.
- the present invention also includes an inverter including the chained multi-port grid-connected interface device, as shown in FIG. 7, the inverter includes three unit phases, each phase unit including an interface device and a reactor The series connection of the three phase units is connected to each other to form an angular connection, and the three connection points of the first and last connections are respectively connected to the three phases of the grid side.
- the invention can be applied to a DC grid, an AC/DC hybrid distribution network, a microgrid, etc., which need to connect a low voltage unit to a medium and high voltage power grid, and can also be used for a medium voltage AC load, such as a medium voltage motor inverter application.
- Scenario 1 The microgrid system on the island contains the following requirements:
- DC power supply including 2 sets (500kW) of photovoltaic power generation, the output is DC 600V
- Energy storage unit 1 group of energy storage unit (800kW) composed of sodium-sulfur battery, the output is DC 700V
- AC load Contains 2 sets of AC load for power supply on the island, 1 set of single-phase 220V AC load (200kW), 1 set of three-phase 380V AC load (300kW)
- the total capacity reaches 3200 kW
- the high-voltage side voltage is 10 kV
- 10 sub-module units are included, and each sub-module unit is configured with a DC/DC unit, DC/ DC unit design capacity is 320kW, DC/DC unit output is connected in parallel, and a 1100V DC bus is provided.
- the total capacity of the DC bus is 3200kW. Since the power demand includes multiple electrical systems, multiple DCs are required based on the 1100V DC bus.
- the /DC unit and the DC/AC unit match different power sources and loads, and the overall structure is complicated. In this scenario, a total of 13 DC/DC converters and 5 DC/AC converters are required.
- the commutation chain is composed of 10 sub-module units connected in series, and the AC ends of the 10 sub-modules are connected in series, and connected to the high-voltage side of the 10 kV AC.
- a total of five sets of DC/AC converters and four sets of DC/DC converters are provided, providing five independent AC interaction ports and four independent DC interaction ports.
- the AC interactive port connection consists of 3 sets of (300kW) wind power generation units, 1 set of single-phase load, 1 set of three-phase load, DC interactive port to connect 2 sets of photovoltaic power generation units, and 1 set of energy storage energy storage unit.
- the capacity of each sub-module unit and the DC/DC or DC/AC converter is greater than or equal to the capacity required by the port, and the capacity of each sub-module is generally designed to be equivalent for engineering. Design and production, for this scenario, most of the required unit capacity is not more than 500kW. For the energy storage unit, the capacity is 800kW.
- the two units can be connected in parallel. The configuration is very flexible and easy to design.
- Each DC/DC or DC/AC converter is independently controlled, and the port voltage is adjustable. The adaptation of the different electrical units within the working range is achieved by the control strategy of each converter and the adjustment of the control target. Compared with the prior art, it also has the following advantages:
- the prior art scheme includes two power conversion links from the sub-module unit to the access unit, and the present invention only needs one power conversion link, and the efficiency has a significant advantage.
- the present invention is easier to expand than the prior art solution.
- this application scenario it is assumed that a new photovoltaic power generation unit needs to access the system, and the addition of a new unit leads to an increase in the total capacity of the device.
- the sum of the capacities of the DC/DC converters exceeds the original design range. At this time, it is difficult to increase the capacity again.
- increasing the capacity of 10 DC/DC converters is very expensive, and the sub-module unit of the converter chain needs to be added. A lot of changes have been made to the original system structure.
- the device of the present invention has a spare port, and only needs to add one DC/DC converter to the standby port to access the new photovoltaic power generation unit.
- one inverter has three AAC three-phase converter chains, so there will be a large number of spare ports.
- the spare ports are reserved without any increase in cost, and the device utilization is not affected, but for the prior art.
- the solution, if reserved, requires an increase in the capacity of 10 DC/DC converters, adding additional cost.
- the solution of the present invention can connect the primary side of the multi-winding transformer through the AC interaction port.
- the embodiment includes 10 sub-module units, including 6 sets of DC/AC converters, and 6 slots are provided.
- AC interactive port, multi-winding transformer consists of 6 primary sides, and is connected with 6 AC interactive ports one by one.
- the secondary side of the multi-winding transformer is connected to a 6kV medium voltage AC motor, and the DC/AC inverter connected to the submodule is controlled.
- the duty cycle of the device can control the output AC frequency and adjust the speed or torque of the medium voltage AC motor load.
- This implementation also includes four alternate ports for capacity expansion or access to other types of power supplies or loads.
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Abstract
Description
Claims (20)
- 一种链式多端口并网接口装置,包含一个换流链,所述换流链由相互串联的至少两个子模块单元构成,所述子模块单元包含功率变换单元以及电容,电容的正极、负极引出,定义为子模块单元的直流端,功率变换单元的一端与电容并联连接,另一端定义为子模块单元的交流端,各个子模块的交流端首尾顺次连接,其特征在于,所述链式多端口并网接口装置还包括至少一个直流变换器、至少一个直-交变换器,所述直流变换器实现将一种直流电变换成另一种具有不同输出特性的直流电,直流变换器的一端与子模块单元的直流端连接,另一端定义为并网接口装置的直流交互端口,所述直-交变换器实现将直流电变换成交流电,直-交变换器的直流电连接端与子模块单元的直流端连接,交流电连接端定义为并网接口装置的交流交互端口。
- 如权利要求1所述的链式多端口并网接口装置,其特征在于,所述接口装置至少包含一个空闲的直流端,上述直流端未与直-交变换器连接,也未与直流变换器连接,定义为备用端口。
- 如权利要求1所述的链式多端口并网接口装置,其特征在于,所述接口装置包含至少两个直流交互端口以及至少两个交流交互端口。
- 如权利要求1所述的链式多端口并网接口装置,其特征在于,所述接口装置包含至少两个交流交互端口,所述交流交互端口与多绕组变压器连接,多绕组变压器的每组原边均与一个交流交互端口连接,多绕组变压器的副边定义为第一中压交流端口。
- 如权利要求1所述的链式多端口并网接口装置,其特征在于,所述接口装置包含至少两个交流交互端口,所述交流交互端口串联连接,所述串联连接后的端口定义为第二中压交流端口。
- 如权利要求1所述的链式多端口并网接口装置,其特征在于,所述接口装置包含至少两个直流交互端口,所述直流交互端口串联连接,定义为中压直流端口。
- 如权利要求1所述的链式多端口并网接口装置,其特征在于,所述接口装置中的交流交互端口的输出电压幅值和相位可独立的调节,直流交互端口的输出电压幅值可独立的调节。
- 如权利要求1所述的链式多端口并网接口装置,其特征在于,所述子模块单元为由4组全控型功率半导体器件构成的H桥功率模块单元。
- 如权利要求1所述的链式多端口并网接口装置,其特征在于,所述子模块单元为由2组全控型功率半导体器件构成的半桥功率模块单元。
- 如权利要求1所述的链式多端口并网接口装置,其特征在于,所述接口装置还包含至少一个旁路开关,所述旁路开关与子模块单元交流端并联。
- 如权利要求1所述的链式多端口并网接口装置,其特征在于,所述接口装置还包含至少一个直流开关,所述直流开关串联在子模块单元与直流变换器或直-交变换器之间。
- 如权利要求1至11中任意一项所述的一种链式多端口并网接口装置的控制方法,其特征在于,当装置接收到启动指令时,所述控制方法包括如下步骤:步骤1:所述并网接口装置换流链中的子模块单元中的功率变换器单元开始启动;步骤2:对各子模块的直流端电压进行闭环控制,控制每个子模块的直流端电压稳定;步骤3:待子模块的直流端电压稳定后,启动链式多端口并网接口装置中的直流变换器以及直-交变换器,通过控制直流变换器以及直-交变换器中功率半导体器件的开通关断, 使流过直流变换器以及直-交变换器的电流为0;步骤4:通过控制直流变换器以及直-交变换器中功率半导体器件的开通关断,使流过直流变换器以及直-交变换器的电流逐渐增加,直至电流达到目标值。
- 如权利要求1至11中任意一项所述的一种链式多端口并网接口装置的控制方法,其特征在于,当装置接受到停机指令时,所述控制方法包括如下步骤:步骤1:通过控制直流变换器以及直-交变换器中功率半导体器件的开通关断,使流过直流变换器以及直-交变换器的电流逐渐减小,直至电流达到0;步骤2:停止链式多端口并网接口装置中的直流变换器以及直-交变换器,功率半导体器件闭锁;步骤3:停止并网接口装置换流链中的子模块单元,整个装置停止运行。
- 如权利要求1至11中任意一项所述的一种链式多端口并网接口装置的控制方法,其特征在于,当装置中的子模块单元发生故障时,所述控制方法包括如下步骤:步骤1:发生故障的子模块单元中的功率半导体器件停止工作,同时闭合与子模块单元并联的旁路开关;步骤2:停止链式多端口并网接口装置中的直流变换器以及直-交变换器,功率半导体器件闭锁。
- 如权利要求14所述的一种链式多端口并网接口装置的控制方法,其特征在于,步骤2为:停止链式多端口并网接口装置中的直流变换器以及直-交变换器,功率半导体器件闭锁,同时分开对应的直流开关。
- 如权利要求1至11中任意一项所述的一种链式多端口并网接口装置的控制方法,其特征在于,当装置中的直流变换器或直-交变换器发生故障时,所述控制方法包括如下步骤:步骤1:发生故障的直流变换器或直-交变换器的功率半导体器件停止工作;步骤2:分开对应的直流开关。
- 一种含有权利要求1-11中任意一项所述链式多端口并网接口装置的***,其特征在于,所述***包含链式多端口并网接口装置以及与其相连接的低压单元,所述低压单元的种类包括直流电源、交流电源、储能单元、直流负荷或者交流负荷,其中,接口装置中的直流交互端口与直流电源、储能单元或者直流负荷相连接,,接口装置中的交流交互端口与交流电源或者交流负荷相连接。
- 一种含有权利要求1-11中任意一项所述链式多端口并网接口装置的换流器,其特征在于,所述换流器包括三相,每一相包括上下两个桥臂,每个桥臂包含一个电抗器与所述接口装置的串联连接,上下两个桥臂合在一起组成一个相单元,上下两个桥臂的连接点为中点,三个上桥臂的引出端连接在一起,作为所述换流器正端;三个下桥臂的引出端连接在一起,作为所述换流器的负端,所述换流器的三相桥臂的中点与电网连接,换流器的正端与直流输电线路的正极连接,换流器的负端与直流输电线路的负极连接。
- 一种含有权利要求1-11中任意一项所述链式多端口并网接口装置的换流器,其特征在于,所述换流器包括三个相单元,每一个相单元包括一个接口装置与电抗器的串联连接,三个相单元的一端相连,构成星型连接,三个相单元的另一端分别与电网侧的三相对应连接。
- 一种含有权利要求1-11中任意一项所述链式多端口并网接口装置的换流器,其特征在于,所述换流器包括三个单元相,每一个相单元包括一个接口装置与电抗器的串联连接,三个相单元的首尾相互连接,构成角型连接,首尾连接的三个连接点分别与电网侧的三相对应连接。
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CN107276125A (zh) | 2017-10-20 |
KR20200017501A (ko) | 2020-02-18 |
EP3651305A4 (en) | 2021-01-13 |
JP2020526178A (ja) | 2020-08-27 |
JP6951542B2 (ja) | 2021-10-20 |
US20200220355A1 (en) | 2020-07-09 |
KR102311485B1 (ko) | 2021-10-08 |
EP3651305A1 (en) | 2020-05-13 |
CN107276125B (zh) | 2023-06-27 |
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