CN111740406A - Island inverter power supply, switching control method and system - Google Patents
Island inverter power supply, switching control method and system Download PDFInfo
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- CN111740406A CN111740406A CN202010499841.7A CN202010499841A CN111740406A CN 111740406 A CN111740406 A CN 111740406A CN 202010499841 A CN202010499841 A CN 202010499841A CN 111740406 A CN111740406 A CN 111740406A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004146 energy storage Methods 0.000 claims abstract description 48
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 230000009466 transformation Effects 0.000 claims abstract description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 109
- 238000002955 isolation Methods 0.000 claims description 21
- 230000003068 static effect Effects 0.000 claims description 10
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 238000003786 synthesis reaction Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 2
- 230000007123 defense Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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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
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses an island inverter power supply, a switching control method and a system, wherein the island inverter power supply comprises a first branch and a second branch connected with the first branch in parallel; the first branch comprises a switching device; the second branch comprises at least two transformation units connected in series; an energy storage device is connected in parallel on a direct current bus between two adjacent conversion units; the input ends of the first branch and the second branch are connected with an input power supply; the output ends of the first branch and the second branch are connected with loads. The invention adopts three power output channels to be connected in parallel for synchronous power synthesis to realize short-time high-power output, does not need additional redundancy design, and solves the problem that the conventional power supply, the diesel engine set and the like are difficult to provide impact power of multiple times.
Description
Technical Field
The invention relates to the field of island alternating current power supply, in particular to an island inverter power supply, a switching control method and a system.
Background
The island power supply usually adopts an uninterrupted power supply structure, and has the advantages of high power supply quality, flexible power supply, strong controllability and the like. However, the types of loads on islands are various, the distributed power supply mode on islands is susceptible to impact caused by load power change, particularly impact loads such as defense equipment, large motor transmission devices, weapon systems and the like, power which is several times higher than that in conventional operation needs to be provided during starting or working, and overload impact duration is long. The independent power supply mode can ensure stable power supply of the load in a conventional mode, but cannot meet the requirement of electric energy supply in the impact process. The construction of the multiple redundant power supply can meet the overload requirement, but the mode is equivalent to the mode of putting multiple power supplies into the power supply to maintain the power supply in the impact process, so that the cost is high, the consumption is large, the size is large, the utilization rate is low, the special requirements of high reliability, concealment and the like are difficult to meet, the development of national defense and economic construction of islands is restricted, and the island power supply with short-time high-power output capability is urgent to wait for topology.
Patent ZL 201710756050.6 discloses a sea island high instantaneous energy conversion power supply and its power supply method, in the short time overload power supply mode, the method is used to improve the short time energy output capability by using the two-way DC/AC converter of the back stage, the hot standby redundant two-way DC/AC converter connected in parallel with it, and the diesel engine set to provide the overload energy loop for the load. The structure disclosed in the patent is provided with the same conversion circuit and the reverse parallel IGBT module on the front-stage AC/DC converter and the rear-stage DC/AC converter, and needs to be combined with a redundant standby module to realize the short-time overload capacity.
Disclosure of Invention
The invention aims to solve the technical problems that aiming at the defects of the prior art, the invention provides an island inverter power supply, a switching control method and a system, which improve the short-time high-power output capability of the power supply under the condition of no redundancy design, provide electric energy guarantee for overload operation of a load and solve the problem that the conventional power supply, a diesel engine set and the like are difficult to provide impact power multiple times.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an island inverter power supply comprises a first branch and a second branch connected with the first branch in parallel; the first branch comprises a switching device; the second branch comprises at least two transformation units connected in series; an energy storage device is connected in parallel on a direct current bus between two adjacent conversion units; the input ends of the first branch and the second branch are connected with an input power supply; the output ends of the first branch and the second branch are connected with loads.
The energy storage device comprises a battery pack and an isolated bidirectional DC/DC converter; the positive end and the negative end of the battery pack are respectively and correspondingly connected with the positive end and the negative end of the primary side of the bidirectional isolated DC/DC converter; the positive end of the battery pack is also connected with the negative end of the secondary side of the bidirectional isolation type DC/DC converter; the negative end of the battery pack is the negative end of the direct current port of the energy storage device, and the positive end of the secondary side of the bidirectional isolation type DC/DC converter is the positive end of the direct current port of the energy storage link. In the energy storage device, one part of output power is directly provided by the battery pack, the other part of the output power is provided by the bidirectional isolation type DC/DC converter, the bidirectional isolation type DC/DC converter only needs to process the power generated by the difference between the direct current port of the energy storage link and the voltage of the battery pack, the power requirement of the bidirectional isolation type DC/DC converter is reduced, and the energy storage device ensures the high-power output capacity of the energy storage link.
The number of the transformation units is 2; the first conversion unit comprises a first filter and a bidirectional AC/DC converter which are connected in series; the second conversion unit comprises a bidirectional DC/AC converter and a second filter which are connected in series; the bidirectional AC/DC converter is connected with the bidirectional DC/AC converter in series; and the direct-current port of the energy storage device is connected to a direct-current bus between the bidirectional AC/DC converter and the bidirectional DC/AC converter in parallel. The bidirectional AC/DC and DC/AC converters can realize bidirectional conversion of alternating current and direct current energy, and are favorable for maintaining the voltage stability of the direct current bus.
The bidirectional AC/DC converter and the bidirectional DC/AC converter are both a three-phase two-level conversion structure or a three-phase T-shaped clamping three-level conversion structure. The structure is standardized and is convenient to realize.
In a rectified and stabilized direct current bus voltage mode, the input power supply supplies electric energy to the load through a first filter, a bidirectional AC/DC converter, a bidirectional DC/AC converter and a second filter; under an inversion control alternating current output power mode, the energy storage device, the bidirectional AC/DC converter, the first filter, the switching device and the load form a first power output channel in sequence, the energy storage device, the bidirectional DC/AC converter, the second filter and the load form a second power output channel, and the input power supply, the switching device and the load form a third power output channel. The first power output channel, the second power output channel and the third power output channel are formed by switching and controlling the power output channel and the bypass channel in a conventional mode, and the high-power output channel can be provided for an overload mode without additional redundancy design.
The switching device is a static bypass switch. The driving trigger circuit is simple and the switching speed is high.
The invention also provides a switching control method of the island inverter power supply, which comprises the following steps:
1) after receiving a switching instruction, blocking trigger pulses of the bidirectional AC/DC converter and the bidirectional DC/AC converter, switching the energy storage device into a bus voltage control mode, and triggering the switching device;
2) switching the operation mode of the bidirectional AC/DC converter from a rectification stable direct current bus voltage mode to an inversion control alternating current output power mode, unlocking trigger pulses of the bidirectional AC/DC converter, and synchronously connecting the bidirectional AC/DC converter and the input power supply in parallel; and switching the operation mode of the bidirectional DC/AC converter to an inversion control alternating current output power mode, unlocking trigger pulses of the bidirectional DC/AC converter, and synchronously connecting the bidirectional DC/AC converter and the input power supply in parallel.
Corresponding to the control method, the invention also provides a switching control system of the island inverter power supply, which comprises the following steps:
the command receiving module is used for receiving and sending a switching command to a control panel of the sea island inverter power supply;
the command execution module is used for blocking trigger pulses of the bidirectional AC/DC converter and the bidirectional DC/AC converter, switching the energy storage device into a bus voltage control mode and triggering the switching device;
the switching module is used for switching the operation mode of the bidirectional AC/DC converter from a rectified stable direct current bus voltage mode to an inversion control alternating current output power mode, unlocking trigger pulses of the bidirectional AC/DC converter and synchronously connecting the bidirectional AC/DC converter and the input power supply in parallel; and switching the operation mode of the bidirectional DC/AC converter to an inversion control alternating current output power mode, unlocking trigger pulses of the bidirectional DC/AC converter, and synchronously connecting the bidirectional DC/AC converter and the input power supply in parallel.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts three power output channels to be connected in parallel for synchronous power synthesis to realize short-time high-power output, does not need additional redundancy design, and solves the problem that the conventional power supply, the diesel engine set and the like are difficult to provide multiple times of impact power; the short-time high-power output can reach 3 times to 5 times of rated power, and the output duration can reach more than 1 min;
2. an inverter power supply switching control technology is provided, the operation mode of the bidirectional AC/DC converter is switched from a mode of rectifying stable DC bus voltage to a mode of inverting control AC output power, an additional inverting path is provided, and power output capacity is improved;
3. the energy storage link structure of the island high-power inverter power supply is provided, the battery pack is connected with the primary side port of the bidirectional isolation type DC/DC converter in parallel, and the secondary side port of the bidirectional isolation type DC/DC converter is connected in series to form a circuit structure of the energy storage link, the bidirectional isolation type DC/DC converter only needs to process power generated by the voltage difference between the direct current port of the energy storage link and the battery pack, the power requirement of the bidirectional isolation type DC/DC converter is greatly reduced, and the high-power output capacity of the energy storage link is guaranteed.
Drawings
Fig. 1 is a circuit structure of an island high-power inverter according to an embodiment of the invention;
FIG. 2 illustrates a conventional operation mode of the island high power inverter according to an embodiment of the present invention;
FIG. 3 illustrates a high power output mode of an island high power inverter according to an embodiment of the present invention;
FIG. 4 is a block diagram of the switching control process of the island high-power inverter according to an embodiment of the present invention;
fig. 5 is a circuit structure of an energy storage link in the island high-power inverter according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a circuit structure of an island high power inverter according to an embodiment of the present invention, which includes a first filter, a bidirectional AC/DC converter, a bidirectional DC/AC converter, a second filter, an energy storage element, and a static bypass switch; the first filter, the bidirectional AC/DC converter, the bidirectional DC/AC converter and the second filter are connected in sequence; the bidirectional AC/DC converter and the direct-current port of the bidirectional DC/AC converter are connected to form a direct-current bus, and the direct-current port of the energy storage link is connected to the direct-current bus in parallel; the input end of the static bypass switch is connected with the input end of the first filter in parallel, and the output end of the static bypass switch is connected with the output end of the second filter in parallel.
The bidirectional AC/DC converter and the bidirectional DC/AC converter are both a three-phase two-level conversion structure or a three-phase T-shaped clamping three-level conversion structure;
fig. 2 shows a conventional operation mode of the island high-power inverter according to an embodiment of the present invention, in which the power supply only needs to provide steady-state power to the load, no overload power is required, and the electric energy is converted and transmitted by a single power transmission channel. The specific power conversion and transmission process is as follows: the input source provides high-quality electric energy for the special load through the first filter, the bidirectional AC/DC converter, the bidirectional DC/AC converter and the second filter; at this point, the static bypass switch is not triggered and the input source does not directly provide power to the load.
Fig. 3 shows a high power output mode of the island high power inverter according to an embodiment of the present invention, in which a special load needs to complete the start of a core functional component or a special function to enter an overload mode, at which time, the inverter needs to provide sufficient power to the load, and the island high power inverter is switched from a conventional operation mode to a high power output mode. In order to realize high-power output, on the basis of the circuit structure of the island high-power inverter, the circuit structure and the power flow direction are switched and combined, a static bypass switch is triggered, three paths of power transmission channels are skillfully constructed, short-time high-power output is realized through parallel synchronous power synthesis, the requirement of high overload of a load is met, and meanwhile, the power conversion capability of the transformer in the island high-power inverter is fully utilized without configuring a redundant module of an overload redundant transformer.
The three power transmission channels are specifically: the first power output channel consists of an energy storage link, a direct current bus, a bidirectional AC/DC converter, a first filter and a static bypass switch, and provides power for a load after converting the electric energy of the energy storage link; the second path of power output channel consists of an energy storage link, a bidirectional DC/AC converter and a second filter, and also provides power for a load after converting the electric energy of the energy storage link; the third power output channel is used for supplying power to the load by the input source through the static bypass switch.
Fig. 4 is a switching control flow of the island high-power inverter according to an embodiment of the present invention, which is a switching process of the island high-power inverter from a conventional operation mode to a high-power output mode and a control mode of each converter. The method comprises the following steps: after a control system of the island high-power inverter receives a switching instruction sent by an upper-layer controller, a bidirectional AC/DC converter and a bidirectional DC/AC converter trigger pulse are blocked, an energy storage device is switched to a bus voltage control mode, and a driving signal is sent to trigger a static bypass switch; switching the operation mode of the bidirectional AC/DC converter from a rectification stable direct current bus voltage mode to an inversion control alternating current output power mode, unlocking a trigger pulse of the bidirectional AC/DC converter and synchronously connecting the trigger pulse with the input source in parallel; and switching the operation mode of the bidirectional DC/AC converter to an inversion control alternating current output power mode, unlocking trigger pulses of the bidirectional DC/AC converter and synchronously connecting the trigger pulses with the input source in parallel.
Fig. 5 is a circuit structure of an energy storage link in an island high-power inverter according to an embodiment of the present invention. The energy storage link needs to provide short-time overload electric energy for the load, the power needing to be output is the sum of the output power of the first power output channel and the output power of the second power output channel, the sum is 2-4 times of the rated power, and the duration time is more than 1 min. When the bidirectional DC/DC converter is used for converting the electric energy of the battery pack, the power transmitted by the bidirectional DC/DC converter is large, the loss is also large, high-power output can be realized only by careful design, and meanwhile, the bidirectional DC/DC converter is prevented from being subjected to overheat protection or burnout due to large overload loss. Therefore, an energy storage link structure of the island high-power inverter power supply is provided, and the energy storage link comprises an energy storage battery pack and a bidirectional isolation type DC/DC converter. The positive end and the negative end of the battery pack are respectively connected with the positive end and the negative end of the primary side of the bidirectional isolation type DC/DC converter, and the positive end of the battery pack is also connected with the negative end of the secondary side of the bidirectional isolation type DC/DC converter; the negative end of the battery pack is used as the negative end of the direct current port of the energy storage link, and the positive end of the secondary side of the bidirectional isolation type DC/DC converter is used as the positive end of the direct current port of the energy storage link, so that a structure that the battery pack and the secondary side of the bidirectional isolation type DC/DC converter are connected in series to form the direct current port of the energy storage link is formed; the bidirectional isolation type DC/DC converter controls the primary side voltage to realize charging and controls the secondary side voltage to realize discharging to stabilize the DC bus voltage. In the provided energy storage link structure, the bidirectional isolation type DC/DC converter only needs to process the power generated by the difference between the direct current port of the energy storage link and the voltage of the battery pack, so that the power requirement of the bidirectional isolation type DC/DC converter is greatly reduced, the high-power output capability of the energy storage link is ensured, and the power loss of the bidirectional DC/DC converter is reduced. The bidirectional isolation type DC/DC converter can adopt a circuit topology designed by a soft switch, such as a resonant bidirectional isolation type DC/DC converter or a bidirectional active bridge and other topology structures, so that the operation efficiency of the converter is further improved.
Claims (9)
1. An island inverter power supply is characterized by comprising a first branch and a second branch connected with the first branch in parallel; the first branch comprises a switching device; the second branch comprises at least two transformation units connected in series; an energy storage device is connected in parallel on a direct current bus between two adjacent conversion units; the input ends of the first branch and the second branch are connected with an input power supply; the output ends of the first branch and the second branch are connected with loads.
2. The island inverter of claim 1, wherein the energy storage device comprises a battery pack and an isolated bidirectional DC/DC converter; the positive end and the negative end of the battery pack are respectively and correspondingly connected with the positive end and the negative end of the primary side of the bidirectional isolated DC/DC converter; the positive end of the battery pack is also connected with the negative end of the secondary side of the bidirectional isolation type DC/DC converter; the negative end of the battery pack is the negative end of the direct current port of the energy storage device, and the positive end of the secondary side of the bidirectional isolation type DC/DC converter is the positive end of the direct current port of the energy storage link.
3. The island inverter of claim 1, wherein the number of the transformation units is 2; the first conversion unit comprises a first filter and a bidirectional AC/DC converter which are connected in series; the second conversion unit comprises a bidirectional DC/AC converter and a second filter which are connected in series; the bidirectional AC/DC converter is connected with the bidirectional DC/AC converter in series; and the direct-current port of the energy storage device is connected to a direct-current bus between the bidirectional AC/DC converter and the bidirectional DC/AC converter in parallel.
4. The island-in-sea inverter of claim 3, wherein the bidirectional AC/DC converter and the bidirectional DC/AC converter are both a three-phase two-level conversion structure or a three-phase T-clamp three-level conversion structure.
5. The island inversion power supply of any one of claims 2 to 4, wherein in a rectified and stabilized DC bus voltage mode, the input power supply supplies power to the load through a first filter, a bidirectional AC/DC converter, a bidirectional DC/AC converter and a second filter; under an inversion control alternating current output power mode, the energy storage device, the bidirectional AC/DC converter, the first filter, the switching device and the load form a first power output channel in sequence, the energy storage device, the bidirectional DC/AC converter, the second filter and the load form a second power output channel, and the input power supply, the switching device and the load form a third power output channel.
6. The island-in-sea inverter according to any one of claims 1 to 4, wherein the switching device is a static bypass switch.
7. A switching control method of the island inverter power supply of any one of claims 2 to 5, comprising the steps of:
1) after receiving the switching instruction, the control system of the island inverter power supply blocks the trigger pulses of the bidirectional AC/DC converter and the bidirectional DC/AC converter, switches the energy storage device into a bus voltage control mode, and sends a driving signal to trigger the switching device;
2) switching the operation mode of the bidirectional AC/DC converter from a rectification stable direct current bus voltage mode to an inversion control alternating current output power mode, unlocking trigger pulses of the bidirectional AC/DC converter, and synchronously connecting the bidirectional AC/DC converter and the input power supply in parallel; and switching the operation mode of the bidirectional DC/AC converter to an inversion control alternating current output power mode, unlocking trigger pulses of the bidirectional DC/AC converter, and synchronously connecting the bidirectional DC/AC converter and the input source in parallel.
8. The method of claim 7, wherein the input power source supplies power to the load via a first filter, a bi-directional AC/DC converter, a bi-directional DC/AC converter, and a second filter in a rectified and stabilized DC bus voltage mode; under an inversion control alternating current output power mode, the energy storage device, the bidirectional AC/DC converter, the first filter, the switching device and the load form a first power output channel in sequence, the energy storage device, the bidirectional DC/AC converter, the second filter and the load form a second power output channel, and the input power supply, the switching device and the load form a third power output channel.
9. A switching control system of an island inverter power supply is characterized by comprising:
the command receiving module is used for receiving and sending a switching command to a control system of the sea island inverter power supply;
the command execution module is used for blocking trigger pulses of the bidirectional AC/DC converter and the bidirectional DC/AC converter, switching the energy storage device into a bus voltage control mode and triggering the switching device;
the switching module is used for switching the operation mode of the bidirectional AC/DC converter from a rectified stable direct current bus voltage mode to an inversion control alternating current output power mode, unlocking trigger pulses of the bidirectional AC/DC converter and synchronously connecting the bidirectional AC/DC converter and the input power supply in parallel; and switching the operation mode of the bidirectional DC/AC converter to an inversion control alternating current output power mode, unlocking trigger pulses of the bidirectional DC/AC converter, and synchronously connecting the bidirectional DC/AC converter and the input source in parallel.
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| CN202010499841.7A CN111740406A (en) | 2020-06-04 | 2020-06-04 | Island inverter power supply, switching control method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113328456A (en) * | 2021-06-24 | 2021-08-31 | 广东电网有限责任公司 | Low pressure bi-polar alternating current-direct current switches power supply system based on loRa communication |
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| CN107482756A (en) * | 2017-08-29 | 2017-12-15 | 湖南大学 | A kind of high instantaneous energy converting power source in island and its method of supplying power to |
| CN109245539A (en) * | 2018-09-29 | 2019-01-18 | 中国电子科技集团公司第四十三研究所 | A kind of voltage superposition formula booster circuit |
| CN110148944A (en) * | 2019-06-19 | 2019-08-20 | 广东志成冠军集团有限公司 | A kind of high power density island line-interactive UPS and its integrated control method |
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2020
- 2020-06-04 CN CN202010499841.7A patent/CN111740406A/en active Pending
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| JP2016049011A (en) * | 2014-08-28 | 2016-04-07 | サンケン電気株式会社 | Uninterruptible power supply |
| CN107482756A (en) * | 2017-08-29 | 2017-12-15 | 湖南大学 | A kind of high instantaneous energy converting power source in island and its method of supplying power to |
| CN109245539A (en) * | 2018-09-29 | 2019-01-18 | 中国电子科技集团公司第四十三研究所 | A kind of voltage superposition formula booster circuit |
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| CN113328456A (en) * | 2021-06-24 | 2021-08-31 | 广东电网有限责任公司 | Low pressure bi-polar alternating current-direct current switches power supply system based on loRa communication |
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Application publication date: 20201002 |