Intelligent hotel load unloading power distribution system and method provided with diesel generator set

Abstract

The invention discloses a hotel intelligent load unloading power distribution system and method provided with a diesel generating set, and the system comprises a municipal power supply and the diesel generating set, and the municipal power supply supplies power to a hotel load through a power transformer via two low-voltage buses; the second path of power transformer leads out one branch of the dual-power change-over switch to serve as one path of mains supply inlet wire; the diesel generator leads out two parts of the dual-power change-over switch to serve as a standby power supply incoming line; a programmable controller is arranged on a main outgoing circuit breaker of the generator, a shunt release is arranged on a three-level load low-voltage outgoing circuit breaker on the low-voltage bus, and the shunt release is connected with the programmable controller through a communication line; the utilization efficiency of the diesel generator is improved, the power supply reliability of the hotel is guaranteed, and the normal operation of the hotel is guaranteed to the greatest extent.

Description

Technical Field

[0001] The invention relates to the technical field of power distribution, in particular to an intelligent load unloading power distribution system and method for a hotel provided with a diesel generator set. Background Art

[0002] In order to ensure the reliability of the power supply system, high-end hotels generally use two municipal power supplies and one self-provided power supply, and the self-provided power supply is mostly diesel generator sets. When both municipal power supplies are cut off, the diesel generator sets start to supply power to the hotel's important loads, thereby ensuring the basic operation of the hotel.

[0003] The purpose of setting up a self-contained power supply is to improve the power supply reliability of the hotel's important loads (i.e. the hotel's primary and secondary loads). Therefore, the capacity of the diesel generator set used as a self-contained power supply is determined based on the hotel's primary and secondary loads. In actual operation, the primary and secondary loads do not operate at full load in most cases. Therefore, when the two municipal power sources are cut off and the diesel generator set is started, after meeting the actual operating requirements of the primary and secondary loads, in most cases the unit capacity will still be redundant.

[0004] In conventional hotel power distribution systems, diesel generators only supply power to the first and second level loads. Even if the diesel generators have redundant capacity, they cannot supply power to ordinary third level loads. Therefore, when the two municipal power sources are cut off, the diesel generators start, and the hotel can only maintain the most basic operation. The third level loads such as air conditioning and lighting in ordinary guest rooms will be cut off, which will still have a great impact on the normal operation of the hotel. Summary of the invention

[0005] The purpose of the present invention is to provide a hotel intelligent load unloading power distribution system and method with a diesel generator set. The present invention has the advantages of supplying power to the hotel's third-level loads while ensuring the power supply of the hotel's first and second-level important loads, thereby ensuring the normal operation of high-end hotels.

[0006] The technical solution of the present invention is: a hotel intelligent load unloading power distribution system with a diesel generator set, comprising a first municipal power supply, a second municipal power supply and a diesel generator set; characterized in that: the first municipal power supply is connected to a first power transformer, and after voltage reduction, is led to a first low-voltage bus through a main output circuit breaker of the first power transformer, and the first low-voltage bus is shared by a primary load, a secondary load and a tertiary load;

[0007] The second municipal power supply is connected to the second power transformer, and after voltage reduction, it is led to the first position of the dual power conversion switch of the dual power conversion switch through the main output circuit breaker of the second power transformer, as a municipal power supply line of the dual power supply;

[0008] The diesel generator is connected to the second position of the dual power conversion switch of the dual power conversion switch through the main output line circuit breaker of the diesel generator set, as another backup power supply line of the dual power supply;

[0009] The outgoing line of the dual power conversion switch leads to a second low-voltage bus, and the second low-voltage bus is shared by the primary load, the secondary load and the tertiary load;

[0010] The first low-voltage bus and the second low-voltage bus are connected at low voltage via a low-voltage bus connection switch.

[0011] In the aforementioned hotel intelligent load unloading power distribution system equipped with a diesel generator set, a programmable controller is installed on the main output circuit breaker of the diesel generator set; the programmable controller has current unloading and recovery functions.

[0012] In the aforementioned intelligent load unloading power distribution system for hotels equipped with diesel generator sets, the first low-voltage bus is provided with three groups of outgoing line circuits, which are:

[0013] The first outgoing line three-level load circuit led out through the first low-voltage outgoing line circuit breaker is equipped with a shunt release and connected to the programmable controller through a communication line;

[0014] The second outgoing line secondary load circuit led out through the second low-voltage outgoing line circuit breaker;

[0015] The third outgoing line primary load circuit is led out through the third low-voltage outgoing line circuit breaker.

[0016] In the above-mentioned intelligent load unloading power distribution system of the hotel with diesel generator sets, the second low-voltage bus is equipped with a total of three outgoing line circuits, namely:

[0017] The fourth outgoing line primary load circuit led out through the fourth low-voltage outgoing line circuit breaker;

[0018] The fifth outgoing line secondary load circuit led out through the fifth outgoing line low voltage circuit breaker;

[0019] The sixth outgoing line primary load circuit is led out through the sixth low-voltage outgoing line circuit breaker. The circuit breaker is equipped with a shunt release 2MX, which is connected to the programmable controller through a communication line.

[0020] The intelligent load unloading power distribution method for hotels with diesel generator sets is set. When the power supply is normal, the dual power conversion switch is switched to the first position, the low-voltage contact switch is in the disconnected state, and the two mains supplies power to the first low-voltage bus and the second low-voltage bus respectively;

[0021] When the city power is cut off, the first power transformer and the second power transformer lose power, the main output circuit breaker of the diesel generator set is closed, the dual power conversion switch is switched to the second position of the dual power conversion switch, the low-voltage contact switch is closed, and the first low-voltage bus and the second low-voltage bus are powered by the diesel generator;

[0022] Execute corresponding actions according to the detection results of the programmable controller.

[0023] In the above-mentioned intelligent load unloading power distribution method for hotels with diesel generator sets, the specific contents of executing corresponding actions according to the detection results of the programmable controller are as follows:

[0024] The current value on the main outgoing line circuit breaker of the diesel generator set is detected by the programmable controller, and the upper and lower limits of the system action current are set in the programmable controller;

[0025] If the measured current value does not exceed the upper limit, all outgoing circuit breakers on the low-voltage busbars will not operate, and the hotel will maintain normal operation without being affected;

[0026] If the measured current value exceeds the upper limit, the programmable controller sends a load shedding action signal to the shunt release, and the shunt release controls the corresponding outgoing line circuit breaker to open, and the three-level load is cut off in sequence according to the priority preset by the program until the current value on the main outgoing line circuit breaker of the diesel generator set is lower than the upper limit, and the shedding stops. The programmable controller sends a signal, the shunt release is reset, and the cut three-level load remains in the power-off state;

[0027] If the measured current value is lower than the lower limit, the programmable controller sends a signal to notify the operation and maintenance personnel to manually close the three-level loads that have been de-energized in sequence according to priority until the measured current reaches the upper limit and stops closing the circuit breaker.

[0028] Compared with the prior art, the present application detects the current value of the main outgoing line circuit breaker of the diesel generator set, and dynamically and intelligently manages the removal and input of the power supply load of the diesel generator set through a programmable controller and a shunt release with current unloading and recovery functions;

[0029] Compared with the traditional distribution system in which diesel generator sets only supply power to the first and second level loads, the wiring and control method of the distribution system of the present application not only ensures the power supply to the first and second level loads of the hotel when the city power is out, but also maximizes the use of diesel generator sets to supply electricity to the hotel's third level loads, fully improving the utilization efficiency of the diesel generator sets and ensuring the normal operation of the hotel to the greatest extent.

[0030] Therefore, the present invention has the advantages of supplying power to the hotel's third-level loads while ensuring the power supply to the hotel's first- and second-level important loads, thereby ensuring the normal operation of the high-end hotel. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the hotel's intelligent load unloading power distribution system with diesel generator sets.

[0032] The marks in the attached drawings are: 11-the first municipal power supply, 12-the first power transformer, 13-the first power transformer main output circuit breaker, 14-the first low-voltage bus, 21-the second municipal power supply, 22-the second power transformer, 23-the second power transformer main output circuit breaker, 24-the second low-voltage bus, 31-diesel generator set, 32-diesel generator set main output circuit breaker, 4-dual power conversion switch, 41-the first position of the dual power conversion switch, 42-the second position of the dual power conversion switch, 5-low-voltage bus connecting switch, 61-the One low-voltage outgoing line circuit breaker, 62-the second low-voltage outgoing line circuit breaker, 63-the third low-voltage outgoing line circuit breaker, 64-the fourth low-voltage outgoing line circuit breaker, 65-the fifth low-voltage outgoing line circuit breaker, 66-the sixth low-voltage outgoing line circuit breaker, 71-the third-level load of the first outgoing line, 72-the second-level load of the second outgoing line, 73-the first-level load of the third outgoing line, 74-the first-level load of the fourth outgoing line, 75-the second-level load of the fifth outgoing line, 76-the third-level load of the sixth outgoing line, 81-shunt release 1MX, 82-shunt release 2MX, 9-programmable controller. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0034] Example. A hotel intelligent load unloading power distribution system with a diesel generator set is provided, such as Figure 1 As shown, it includes a first municipal power supply 11, a second municipal power supply 21 and a diesel generator set 31; wherein: the first municipal power supply 11 is connected to the first power transformer 12, and after voltage reduction, it is led to the first low-voltage bus 14 through the first power transformer main output circuit breaker 13, and the first low-voltage bus is shared by the primary load, the secondary load and the tertiary load, which are respectively: the first output tertiary load 71 circuit led out through the first low-voltage output circuit breaker 61, the circuit breaker is equipped with a shunt release 1MX81, and is connected to the programmable controller 9 with current unloading and recovery functions through a communication line; the second output secondary load 72 circuit led out through the second low-voltage output circuit breaker 62; the third output primary load 73 circuit led out through the third low-voltage output circuit breaker 63.

[0035] The second municipal power supply 21 is connected to the second power transformer 22, and after voltage reduction, it is led to the first position 41 of the dual power conversion switch 4 through the second power transformer main output circuit breaker 23, serving as one municipal power input line for the dual power supply; the diesel generator set 31 is led to the second position 42 of the dual power conversion switch 4 through the diesel generator set main output circuit breaker 32, serving as another backup power input line for the dual power supply, and a programmable controller 9 with current unloading and recovery functions is installed on the generator main output circuit breaker.

[0036] When the dual power conversion switch is switched to the first position 41 of the dual power conversion switch, the power supply is powered by the city power supply, and when the dual power conversion switch is switched to the second position 42 of the dual power conversion switch, the power supply is powered by the diesel generator.

[0037] The outgoing line of the dual power conversion switch leads to the second low-voltage bus 24, and the second low-voltage bus is shared by the first load, the second load and the third load, which are respectively: the fourth outgoing line primary load 74 circuit led out through the fourth low-voltage outgoing line circuit breaker 64; the fifth outgoing line secondary load 75 circuit led out through the fifth low-voltage outgoing line circuit breaker 65; the sixth outgoing line primary load 76 circuit led out through the sixth low-voltage outgoing line circuit breaker 66. The circuit breaker is equipped with a shunt release 2MX82, which is connected to the programmable controller 9 with current unloading and recovery functions through a communication line.

[0038] The first low-voltage bus 14 and the second low-voltage bus 24 are connected at low voltage via the low-voltage connecting bus switch 5 .

[0039] The hotel intelligent load unloading power distribution method of the diesel generator set is set. During normal power supply, the dual power conversion switch is switched to the first position, the low-voltage contact switch is in the disconnected state, and the two mains supplies power to the first low-voltage bus and the second low-voltage bus respectively.

[0040] When the city power is cut off, the system operates as follows: the first power transformer and the second power transformer lose power, the main output circuit breaker of the diesel generator set is closed, the dual power conversion switch is switched to the second position of the dual power conversion switch, the low-voltage connecting switch is closed, and the first low-voltage bus and the second low-voltage bus are powered by the diesel generator.

[0041] The current value on the main outgoing line circuit breaker of the diesel generator set is detected by a programmable controller with current unloading and recovery functions. The upper and lower limits of the system operating current are pre-set in the programmable controller according to the capacity and operating characteristics of the diesel generator set;

[0042] If the measured current value does not exceed the upper limit, it means that the operating load does not exceed the capacity of the diesel generator set, then all outgoing circuit breakers on the low-voltage busbars will not operate, and the hotel will maintain normal operation without being affected;

[0043] If the measured current value exceeds the upper limit, it means that the operating load has exceeded the capacity value of the diesel generator set, and the diesel generator set is overloaded. The programmable controller sends a load shedding action signal to the shunt release, and the shunt release controls the corresponding outgoing line circuit breaker to open, and cuts off the three-level load in sequence according to the priority pre-set by the program until the current value on the main outgoing line circuit breaker of the diesel generator set is lower than the upper limit. The shedding stops, the programmable controller sends a signal, the shunt release is reset, and the removed three-level load remains in the power-off state;

[0044] If the measured current value is lower than the lower limit, it means that the diesel generator set has surplus capacity. The programmable controller sends a signal to notify the operation and maintenance personnel to manually close and power off the three-level loads in order of priority until the measured current reaches the upper limit and stops closing.

[0045] By detecting the current value of the main output circuit breaker of the diesel generator set, and through the programmable controller and shunt release with current unloading and recovery functions, the removal and input of the power supply load of the diesel generator set are dynamically and intelligently managed. Compared with the traditional distribution system in which the diesel generator set only supplies the first and second level loads, the wiring and control method of the distribution system of the present invention not only ensures the power supply of the first and second level loads of the hotel when the city power is off, but also maximizes the use of the diesel generator set to supply the third level load of the hotel, fully improving the utilization efficiency of the diesel generator set and ensuring the normal operation of the hotel to the greatest extent.

Claims

1. A hotel intelligent load unloading power distribution system with a diesel generator set, comprising a first municipal power supply, a second municipal power supply and a diesel generator set; characterized in that: The first municipal power supply is connected to the first power transformer, and after voltage reduction, it is led to the first low-voltage bus through the main output circuit breaker of the first power transformer. The first low-voltage bus is shared by the primary load, the secondary load and the tertiary load; The second municipal power supply is connected to the second power transformer, and after voltage reduction, it is led to the first position of the dual power conversion switch of the dual power conversion switch through the main output circuit breaker of the second power transformer, as a municipal power supply line of the dual power supply; The diesel generator is connected to the second position of the dual power conversion switch of the dual power conversion switch through the main output line circuit breaker of the diesel generator set, as another backup power supply line of the dual power supply; The outgoing line of the dual power conversion switch leads to a second low-voltage bus, and the second low-voltage bus is shared by the primary load, the secondary load and the tertiary load; The first low-voltage bus and the second low-voltage bus are connected at low voltage via a low-voltage bus connection switch.

2. The intelligent load unloading power distribution system for hotels equipped with diesel generator sets according to claim 1 is characterized in that: A programmable controller is installed on the main outgoing line circuit breaker of the diesel generator set; the programmable controller has current unloading and recovery functions.

3. The hotel intelligent load unloading power distribution system with diesel generator set according to claim 2 is characterized in that: The first low-voltage busbar is provided with three groups of outgoing line circuits, namely: The first outgoing line three-level load circuit led out through the first low-voltage outgoing line circuit breaker is equipped with a shunt release and connected to the programmable controller through a communication line; The second outgoing line secondary load circuit led out through the second low-voltage outgoing line circuit breaker; The third outgoing line primary load circuit is led out through the third low-voltage outgoing line circuit breaker.

4. The hotel intelligent load unloading power distribution system with a diesel generator set according to claim 2 is characterized in that: The second low-voltage busbar is equipped with three groups of outgoing line circuits, namely: The fourth outgoing line primary load circuit led out through the fourth low-voltage outgoing line circuit breaker; The fifth outgoing line secondary load circuit led out through the fifth outgoing line low voltage circuit breaker; The sixth outgoing line primary load circuit is led out through the sixth low-voltage outgoing line circuit breaker. The circuit breaker is equipped with a shunt release 2MX, which is connected to the programmable controller through a communication line.

5. The intelligent load unloading power distribution method for a hotel with a diesel generator set according to any one of claims 1 to 4, characterized in that: During normal power supply, the dual power conversion switch is switched to the first position, the low-voltage contact switch is in the disconnected state, and the two mains supplies power to the first low-voltage bus and the second low-voltage bus respectively; When the city power is cut off, the first power transformer and the second power transformer lose power, the main output circuit breaker of the diesel generator set is closed, the dual power conversion switch is switched to the second position of the dual power conversion switch, the low-voltage contact switch is closed, and the first low-voltage bus and the second low-voltage bus are powered by the diesel generator; Execute corresponding actions according to the detection results of the programmable controller.

6. The intelligent load unloading power distribution method for hotels with diesel generator sets according to claim 5 is characterized in that: The specific contents of executing corresponding actions according to the detection results of the programmable controller are as follows: The current value on the main outgoing line circuit breaker of the diesel generator set is detected by the programmable controller, and the upper and lower limits of the system action current are set in the programmable controller; If the measured current value does not exceed the upper limit, all outgoing circuit breakers on the low-voltage busbars will not operate, and the hotel will maintain normal operation without being affected; If the measured current value exceeds the upper limit, the programmable controller sends a load shedding action signal to the shunt release, and the shunt release controls the corresponding outgoing circuit breaker to open, and the three-level load is cut off in sequence according to the priority preset by the program until the current value on the main outgoing circuit breaker of the diesel generator set is lower than the upper limit, and the shedding stops. The programmable controller sends a signal, the shunt release is reset, and the cut three-level load remains in the power-off state; If the measured current value is lower than the lower limit, the programmable controller sends a signal to notify the operation and maintenance personnel to manually close the three-level loads that have been de-energized in sequence according to priority until the measured current reaches the upper limit and stops closing the circuit breaker.

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