CN110994693A - Uninterrupted parallel operation grid-connected system and grid-connected method of medium-voltage power supply vehicle - Google Patents
Uninterrupted parallel operation grid-connected system and grid-connected method of medium-voltage power supply vehicle Download PDFInfo
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- CN110994693A CN110994693A CN201911389186.3A CN201911389186A CN110994693A CN 110994693 A CN110994693 A CN 110994693A CN 201911389186 A CN201911389186 A CN 201911389186A CN 110994693 A CN110994693 A CN 110994693A
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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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
Abstract
The invention discloses a non-power-off parallel operation grid-connected system of a medium-voltage power supply vehicle, which comprises a column switch and the power supply vehicle, wherein a generator set, a commercial power input end and a load output end are arranged in the power supply vehicle; the commercial power input end is connected with the incoming side of the column switch through the input load switch, and the load output end is connected with the power transmission side of the column switch through the output load switch. The invention adopts IM-NT, IG-NT and IG-AVRI modules to control the system; the method can ensure that the voltage and the frequency of the generator are controlled to be consistent with those of the commercial power grid, ensures grid connection reliability and multiple safety protections, and can meet the base number of sudden-change loads by setting according to the load value. Meanwhile, an operation method of reliable source vehicle uninterrupted grid connection is perfected, the problem of commercial power backflow is avoided, accidents are reduced, and the operation failure rate is reduced.
Description
Technical Field
The invention relates to the field of emergency power vehicles, in particular to a non-power-outage parallel operation grid connection system and a grid connection method for a medium-voltage power vehicle.
Background
In recent years, with the continuous upgrading of power systems, 10kv distribution lines and equipment become important components of power grids in China, but due to the influence of environmental factors and emergencies, a sudden power failure phenomenon often occurs in a large area, and a fault emergency repair cannot be rapidly carried out in a short time, so that power supply cannot be carried out for a long time, and economic losses are disastrous. At present, a power supply vehicle is popularized and applied in emergency power protection, but in the uninterrupted operation of a large-area 10kv distribution network, the load base number of the power supply vehicle cannot be correctly set due to uncertain factors of the load size, and when the setting is too high, the phenomenon of converging to a main power network occurs; if the setting is too low, insufficient starting is caused, grid connection breakage failure is caused, and normal starting and power conservation cannot be realized; and in the operation process, no standard reliable live working grid-connected operation flow without power outage exists, so that operation failure is easily caused, and the phenomenon of commercial power backflow occurs to cause accidents.
Disclosure of Invention
The invention aims to provide a non-power-outage parallel operation grid connection system and a grid connection method of a medium-voltage power supply vehicle, which are used for controlling the voltage and the frequency of a generator to be consistent with those of a commercial power grid and ensuring grid connection reliability.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
a non-power-outage parallel-operation grid-connected system of a medium-voltage power supply vehicle comprises a column switch and the power supply vehicle, wherein a generator set, a mains supply input end and a load output end are arranged in the power supply vehicle, the mains supply input end is connected with the load output end through a cable, a mains supply input circuit breaker and a load output circuit breaker are sequentially arranged in the power supply vehicle, and the generator set in the power supply vehicle is connected to the input end of the load output circuit breaker in parallel through an oil engine input circuit breaker;
the power supply input end is connected with an input load switch through a power supply input cable, the input load switch is connected with the incoming side of the on-column switch through an input drainage cable, the load output end is connected with an output load switch through a load output cable, and the output load switch is connected with the power transmission side of the on-column switch through an output drainage cable.
Preferably, the commercial power input end is provided with a copper bar socket or a quick connector.
Preferably, when the mains supply input cable is in butt joint with the input load switch and the input drainage cable is in butt joint with the input load switch, the phase sequence of the a/B/C3 phases of the mains supply input cable and the input drainage cable is consistent with the phase sequence of the input load switch identifier; when the load output cable is in butt joint with the output load switch and the output drainage cable is in butt joint with the output load switch, the phase sequence of the A/B/C3 phases of the load output cable and the output drainage cable is consistent with the phase sequence of the output load switch identification.
Preferably, the system further comprises a control system, wherein the control system mainly comprises an IM-NT controller, an IG-NT grid-connected controller and an IG-AVRI module, the IM-NT controller module is connected with the mains supply input end, collects relevant data of a mains supply end and controls the mains supply input circuit breaker, the IG-AVRI module is connected with the engine set and the IG-NT grid-connected controller, collects data of an output power end of the engine and transmits the data to the corresponding IG-NT grid-connected controller of the generator set, and the IG-NT grid-connected controller controls the input circuit breaker of the oil engine and transmits corresponding communication data information.
A non-power-outage grid connection method for a non-power-outage parallel machine grid connection system of a medium-voltage power supply vehicle comprises a forward grid connection method and a reverse grid connection method, wherein the operation steps of the forward grid connection method are ① starting a generator set of the low-voltage power supply vehicle, an IG-AVRI module detects whether the voltage and the phase sequence of the generator set are consistent with feedback information of an IM-NT controller or not, ② the IG-AVRI module adjusts the voltage and the frequency of the generator set to be synchronous with mains supply and synchronizes the phase angle, ③ the IG-AVRI module sends detected load data to the IG-AVRI module, ④ the IG-AVRI module sets values according to load values to meet a sudden change load base number, automatically switches on an oil engine input breaker and a load output breaker to complete medium-voltage power supply and forward grid connection, ⑤ a disconnecting switch on a column, and the mains supply input breaker stops supplying power;
the reverse grid connection method comprises the following operation steps of ① detecting mains supply voltage and phase sequence by the IM-NT controller, transmitting the mains supply voltage and phase sequence to the IG-NT grid connection controller, ② adjusting voltage and frequency of the generator set to be synchronous with mains supply and synchronizing phase angle by the IG-AVRI module, ③ switching on the mains supply input circuit breaker to complete low-voltage power supply vehicle and mains supply reverse grid connection, ④ switching off the input circuit breaker and the load output circuit breaker, switching on the column switch, switching off the mains supply input circuit breaker, and removing a bypass in a charged mode.
The invention adopts IM-NT, IG-NT and IG-AVRI modules to control the system; the method can ensure that the voltage and the frequency of the generator are controlled to be consistent with those of the commercial power grid, ensures grid connection reliability and multiple safety protections, and can meet the base number of sudden-change loads by setting according to the load value. Meanwhile, an operation method of reliable source vehicle uninterrupted grid connection is perfected, the problem of commercial power backflow is avoided, accidents are reduced, and the operation failure rate is reduced.
Drawings
Fig. 1 is a schematic diagram of the wiring connection of the present invention.
Fig. 2 is a circuit diagram of the uninterrupted grid-connected control system of the invention.
FIG. 3 is a drawing of the present invention
In the figure, a column 1 switch, a power supply vehicle 2, a power generating set 3, a commercial power input terminal 4, a load output terminal 5, an input load switch 6, an output load switch 7, an oil engine input breaker 31, a commercial power input breaker 41, a load output breaker 51, an input drainage cable 61, a commercial power input cable 62, an output drainage cable 71 and a load output cable 72.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific examples, but the embodiments of the invention are not limited thereto.
The power supply vehicle is integrated into a 10KV power grid to form a bypass system to supply power to a load. The power grid is supported and installed on the ground through telegraph poles (tension rods and straight rods). Fig. 1 and 2 show a preferred embodiment of the present invention, which includes a column switch 1 and a power supply vehicle 2, where the column switch 1 is a safety switch used on an overhead line to ensure electrical safety, a power generator set 3, a commercial power input terminal 4 and a load output terminal 5 are arranged in the power supply vehicle 2, the commercial power input terminal 4 is connected to the load output terminal 5 through a cable, and is sequentially provided with a commercial power input breaker 41 and a load output breaker 51, and the power generator set 3 in the power supply vehicle is connected in parallel to an input terminal of the load output breaker 51 through an oil engine input breaker 31.
An input load switch 6 is arranged on an input end bypass of the power supply vehicle and connected to the left side (namely the power supply side) of the pole-mounted switch 1, and an output load switch 7 is arranged on an output end bypass and connected to the right side (namely the power supply side) of the pole-mounted switch 1. The input load switch 6 is connected with the column switch 1 through an input drainage cable 61 and is connected with the commercial power input end 4 through a commercial power input cable 62; the output load switch 7 is connected with the column switch 1 through an output drainage cable 71 and is connected with the load output end 5 through a load output cable 72.
Two sides of the closed column switch 1 are respectively connected with a down-leading cable, an input drainage cable 61 is arranged on the left side, and an output drainage cable 71 is arranged on the right side; the input drainage cable 61 is connected with the input load switch 6 at the opposite end, the output drainage cable 71 is connected with the output load switch 7 at the opposite end, the input load switch 6 and the output load switch 7 are both in a brake-off state, when the input drainage cable 3 is connected, the A/B/C phase sequence must be consistent with the identification phase sequence of the input load switch 6 and the output load switch 7, the input load switch 6 serves as a commercial power input source, and the butt commercial power input cable 62 can be connected to the commercial power input end 4 of the power supply vehicle. The commercial power input end 4 adopts two connection modes of a copper bar or a quick plug, is provided with a copper bar socket or a quick plug (not shown in the figure), and has the characteristic of universal usability.
After the external cables are accurately laid, the oil engine input circuit breaker 31, the load output circuit breaker 51 and the commercial power input circuit breaker 41 in the power supply vehicle are operated to be in an opening state, and then the next operation is carried out. Firstly, a bypass input load switch 6 and a bypass output load switch 7 are switched on, then a mains supply input circuit breaker 41 and a load output circuit breaker 51 are switched on, the output load switch 7 is connected with a load output cable 72 to a load output end 5 of a power supply vehicle, and at the moment, a bypass power grid system of a passage is formed by the power supply vehicle system without power failure.
When the power supply system of the power supply vehicle is started to supply power, the pole-mounted switch 1 is firstly disconnected, the pole-mounted switch 1 is confirmed to be in the open state (the inside of the power supply vehicle system can also prompt the load work of a bypass power grid), the generator set 3 is started, the oil closing machine input breaker 31 realizes the forward grid connection, and if the pole-mounted switch 1 is still in the close state before the oil closing machine input breaker 31, the current backflow problem of a main power grid can be caused, and the power grid is influenced. After forward grid connection, the brake-off commercial power is firstly input into the circuit breaker 41 to disconnect the bypass power grid system, then the brake-off commercial power is input into the input load switch 6 of the bypass, the power supply side of the overhead line is powered off, the main output is provided by the power supply vehicle generator set 3 to supply power to the final load, and the power supply end is ensured to be powered off. After the line processing is finished, the power supply of the overhead line is recovered, reverse grid connection is carried out at the moment, the bypass input load switch 6 is switched on first, then the commercial power input circuit breaker 41 is switched on, finally the column switch 1 of the overhead line is switched on, the commercial power carries the load at the rear end, namely the brake oil engine input circuit breaker 31 is switched off, the power generating set 3 is switched off, the brake bypass input load switch 6 and the bypass output load switch 7 are switched off, the input drainage cable 61 and the output drainage cable 71 are taken off in an electrified mode, and the operation of the uninterrupted grid connection system is finished.
The circuit diagram of the control system is shown in fig. 2, and mainly controls the circuit breakers of the related branches to switch the related branches without power outage under the condition that the voltage and the frequency of the generator controlled by the IG-AVRI module are consistent with those of a commercial power grid according to the related controller, so that grid-connected uninterrupted operation is realized. The controller system mainly comprises an IM-NT controller, an IG-NT networking controller and an IG-AVRI module.
The IM-NT controller module collects relevant data of a mains supply end and controls MCB mains supply to be input into the circuit breaker 41, the IG-AVRI module collects data of an output power end of an engine and transmits the data to a corresponding IG-NT controller group of the generator set 3, and the IG-NT controller controls the GCB1 oil engine to be input into the circuit breaker 31 and transmits corresponding communication data information; data integration is realized, all circuit breakers are controlled to be switched on and off reasonably and consistently, and live working without power outage is realized.
Forward grid connection:
the MCB commercial power input breaker 41 is in a closed state, and the commercial power forms a bypass. The mains supply supplies power to a LOAD of a user; the IM-NT controller detects the mains voltage and the phase sequence, transmits the mains voltage and the phase sequence to the IG-NT through can communication and is processed and analyzed in the network controller.
Starting a G1 generator set 3 of a low-voltage power supply vehicle, detecting whether the voltage and the phase sequence of the G1 generator set 3G1 are consistent with the feedback information of an IM-NT controller or not according to an IG-AVRI module of the low-voltage power supply vehicle, adjusting the voltage, the frequency (synchronous with the mains supply) and the synchronous phase angle of the generator set through the IG-AVRI module, sending detected load data to the IG-AVRI module, setting according to a load value to meet a sudden change load base number, and then automatically switching on the oil engine input circuit breaker 31 and the MGCB load output circuit breaker 51 of the GCB1 (delay switching on). And at the moment, the forward grid connection of the medium-voltage power supply and the mains supply is completed, the low-voltage main circuit breaker (namely the column switch 1) is disconnected after the base load value of the IG-NT controller is flexibly loaded to be customized, the MCB mains supply is disconnected and input into the circuit breaker 41, and the mains supply is stopped. The low-voltage power supply vehicle is automatically converted into an independent power supply vehicle from a grid-connected mode to bear the user load in full.
Reverse grid connection:
after the mains supply is restored, the voltage and the phase sequence of the mains supply are detected by the IM-NT controller and transmitted to the IG-NT grid-connected controller, the voltage and the frequency (synchronous with the mains supply) of the whole unit set and the MCB mains supply input circuit breaker 41 is switched on after the synchronous phase angle is adjusted by the IG-AVRI module, and the low-voltage power supply vehicle and the mains supply are reversely connected in a grid mode.
After reverse grid connection, the GCB1 oil engine input breaker 31 and the MGCB load output breaker 51 are switched off, the unit is in cold power failure, the user load supplies power through the commercial power bypass, the user low-voltage main breaker is switched on, the MCB commercial power input breaker 41 is switched off, and the bypass is removed in a charged mode, which is shown in detail in figure 2.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the present invention.
Claims (5)
1. A non-power-outage parallel-operation grid-connected system of a medium-voltage power supply vehicle comprises a column switch and the power supply vehicle, wherein a generator set, a mains supply input end and a load output end are arranged in the power supply vehicle, the mains supply input end is connected with the load output end through a cable, a mains supply input circuit breaker and a load output circuit breaker are sequentially arranged in the power supply vehicle, and the generator set in the power supply vehicle is connected to the input end of the load output circuit breaker in parallel through an oil engine input circuit breaker;
the power supply input end is connected with an input load switch through a power supply input cable, the input load switch is connected with the incoming side of the on-column switch through an input drainage cable, the load output end is connected with an output load switch through a load output cable, and the output load switch is connected with the power transmission side of the on-column switch through an output drainage cable.
2. The uninterruptible parallel operation grid-connected system of the medium-voltage power supply vehicle according to claim 1, characterized in that: and the commercial power input end is provided with a copper bar socket or a quick connector.
3. The uninterruptible parallel operation grid-connected system of the medium-voltage power supply vehicle according to claim 1, characterized in that: when the mains supply input cable is in butt joint with the input load switch and the input drainage cable is in butt joint with the input load switch, the phase sequence of A/B/C3 phases of the mains supply input cable and the input drainage cable is consistent with the phase sequence of the input load switch identifier; when the load output cable is in butt joint with the output load switch and the output drainage cable is in butt joint with the output load switch, the phase sequence of the A/B/C3 phases of the load output cable and the output drainage cable is consistent with the phase sequence of the output load switch identification.
4. The uninterruptible parallel operation grid-connected system of the medium-voltage power supply vehicle according to claim 1, characterized in that: the system mainly comprises an IM-NT controller, an IG-NT networking controller and an IG-AVRI module, wherein the IM-NT controller module is connected with a mains supply input end, collects relevant data of a mains supply end and controls a mains supply input circuit breaker, the IG-AVRI module is connected with the engine set and the IG-NT networking controller, collects data of an output power end of the engine and transmits the data to the corresponding IG-NT networking controller of the generator set, and the IG-NT networking controller controls the input circuit breaker of the oil engine and transmits corresponding communication data information.
5. A non-power-outage grid-connection method for a non-power-outage grid-connection system of a medium-voltage power supply vehicle is characterized by comprising a forward grid-connection method and a reverse grid-connection method, wherein the forward grid-connection method comprises the following operation steps of ① starting a generator set of a low-voltage power supply vehicle, detecting whether the voltage and the phase sequence of the generator set are consistent with feedback information of an IM-NT controller or not by an IG-AVRI module, ② adjusting the voltage and the frequency of the generator set to be synchronous with mains supply and synchronizing the phase angle, ③ sending detected load data to the IG-AVRI module by the IG-AVRI module, ④ setting the value of the IG-AVRI module according to a load value to meet an abrupt load base number, automatically closing an oil engine input breaker and a load output breaker to complete medium-voltage power supply and mains supply grid connection, ⑤ breaking the mains supply input breaker and stopping mains supply by a switch on a column;
the reverse grid connection method comprises the following operation steps of ① detecting mains supply voltage and phase sequence by the IM-NT controller, transmitting the mains supply voltage and phase sequence to the IG-NT grid connection controller, ② adjusting voltage and frequency of the generator set to be synchronous with mains supply and synchronizing phase angle by the IG-AVRI module, ③ switching on the mains supply input circuit breaker to complete low-voltage power supply vehicle and mains supply reverse grid connection, ④ switching off the input circuit breaker and the load output circuit breaker, switching on the column switch, switching off the mains supply input circuit breaker, and removing a bypass in a charged mode.
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| CN111478370A (en) * | 2020-04-15 | 2020-07-31 | 贵州电网有限责任公司 | Multi-parallel-machine grid-connected method and system based on non-stop of low-voltage power supply vehicle |
| CN112332281A (en) * | 2020-11-16 | 2021-02-05 | 国网江苏省电力有限公司南通供电分公司 | Control method for replacing distribution box of low-voltage distribution area without power outage based on mobile energy storage |
| CN113572205A (en) * | 2021-08-16 | 2021-10-29 | 龙岩市海德馨汽车有限公司 | Multi-parallel-machine grid-connected system of medium-voltage power supply vehicle and test method |
| CN113595227A (en) * | 2021-07-20 | 2021-11-02 | 杭州电力设备制造有限公司 | Low-voltage transformer area load uninterrupted switching system and working method thereof |
| CN114552654A (en) * | 2022-03-22 | 2022-05-27 | 国网冀北电力有限公司电力科学研究院 | Grid-connected electrical system |
| CN114597937A (en) * | 2022-03-01 | 2022-06-07 | 广东电网有限责任公司广州供电局 | External mobile synchronous power-off grid-connected platform based on low-voltage power supply and method thereof |
| CN114597937B (en) * | 2022-03-01 | 2024-04-30 | 广东电网有限责任公司广州供电局 | External mobile synchronous uninterrupted grid-connected platform based on low-voltage power supply vehicle and method thereof |
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| CN111478370A (en) * | 2020-04-15 | 2020-07-31 | 贵州电网有限责任公司 | Multi-parallel-machine grid-connected method and system based on non-stop of low-voltage power supply vehicle |
| CN112332281A (en) * | 2020-11-16 | 2021-02-05 | 国网江苏省电力有限公司南通供电分公司 | Control method for replacing distribution box of low-voltage distribution area without power outage based on mobile energy storage |
| CN113595227A (en) * | 2021-07-20 | 2021-11-02 | 杭州电力设备制造有限公司 | Low-voltage transformer area load uninterrupted switching system and working method thereof |
| WO2023000585A1 (en) * | 2021-07-20 | 2023-01-26 | 杭州电力设备制造有限公司 | Low-voltage transformer area load non-power-cut switching system and working method thereof |
| CN113595227B (en) * | 2021-07-20 | 2023-09-15 | 杭州电力设备制造有限公司 | Low-voltage transformer area load uninterrupted switching system and working method thereof |
| CN113572205A (en) * | 2021-08-16 | 2021-10-29 | 龙岩市海德馨汽车有限公司 | Multi-parallel-machine grid-connected system of medium-voltage power supply vehicle and test method |
| CN113572205B (en) * | 2021-08-16 | 2022-04-08 | 龙岩市海德馨汽车有限公司 | Multi-parallel-machine grid-connected system of medium-voltage power supply vehicle and test method |
| CN114597937A (en) * | 2022-03-01 | 2022-06-07 | 广东电网有限责任公司广州供电局 | External mobile synchronous power-off grid-connected platform based on low-voltage power supply and method thereof |
| CN114597937B (en) * | 2022-03-01 | 2024-04-30 | 广东电网有限责任公司广州供电局 | External mobile synchronous uninterrupted grid-connected platform based on low-voltage power supply vehicle and method thereof |
| CN114552654A (en) * | 2022-03-22 | 2022-05-27 | 国网冀北电力有限公司电力科学研究院 | Grid-connected electrical system |
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