Intelligent load unloading power distribution system of diesel generating set for hotel

Abstract

The utility model discloses an intelligent load unloading power distribution system of a diesel generating set for a hotel, which comprises a municipal power supply and a diesel generating set, and the municipal power supply supplies power to a hotel load by a power transformer through two sections of 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 utility model relates to the field of power distribution technology, especially to the intelligent load unloading power distribution system of diesel generating set for hotel. BACKGROUND

[0002] In order to guarantee the reliability of the power supply system, the power supply of high-grade hotel is generally composed of two municipal power supplies and one self-provided power supply, and the self-provided power supply is mostly diesel generating set. When both of the two municipal power supplies are powered off, the diesel generating set is started to supply power for the important load of the hotel, thereby ensuring the basic operation of the hotel.

[0003] The purpose of setting the self-provided power supply is to improve the power supply reliability of the important load (i.e. the first and second level load) of the hotel, and therefore the capacity of the diesel generating set as the self-provided power supply is determined according to the first and second level load of the hotel. In actual operation, the first and second level load is not in full load operation in most cases. Therefore, when both of the two municipal power supplies are powered off and the diesel generating set is started, there is still redundancy in the capacity of the set after meeting the operation demand of the actual first and second level load.

[0004] In the conventional hotel power distribution system, the diesel generating set only supplies power for the first and second level load, and even if the capacity of the diesel generating set has redundancy, it is also impossible to supply power for the ordinary third level load. Therefore, when both of the two municipal power supplies are powered off, the diesel generating set is started, and the hotel can only maintain the most basic operation, and the third level load such as air conditioner and lighting in ordinary guest room will be powered off, which will still have a great impact on the normal operation of the hotel. INVENTION CONTENTS

[0005] The utility model aims at providing the intelligent load unloading power distribution system of diesel generating set for hotel. The utility model has the advantages of supplying power for the third level load of the hotel under the premise of guaranteeing the power supply for the first and second level important load of the hotel, and protecting the normal operation of the high-grade hotel.

[0006] The technical scheme of the utility model: the intelligent load unloading power distribution system of diesel generating set for hotel, comprising first municipal power supply, second municipal power supply and diesel generating set, characterized in that: the first municipal power supply is connected to the first power transformer, is led to the first low-voltage bus through the first power transformer total outgoing circuit breaker after voltage reduction, and the first low-voltage bus is shared by the first level load, the second level load and the third level load;

[0007] The second municipal power supply is connected to the second power transformer, is led to the double power supply transfer switch first sub-position of the double power supply transfer switch through the second power transformer total outgoing circuit breaker after voltage reduction, and serves as the municipal power supply incoming line of the double power supply;

[0008] The diesel generator is connected to the second position of the double power switch through the diesel generator set total outgoing circuit breaker, and serves as another standby power supply of the double power supply;

[0009] The outgoing circuit of the double power switch is connected to the second low-voltage bus, and the second low-voltage bus is shared by a load, a secondary load and a tertiary load;

[0010] The first low-voltage bus and the second low-voltage bus are connected through a low-voltage bus tie switch.

[0011] In the foregoing intelligent load unloading power distribution system of the hotel diesel generator set, a programmable controller is arranged on the diesel generator set total outgoing circuit breaker; the programmable controller has current unloading and recovery functions.

[0012] In the foregoing intelligent load unloading power distribution system of the hotel diesel generator set, the first low-voltage bus is provided with three outgoing circuit groups, which are respectively:

[0013] A first outgoing circuit tertiary load circuit is connected to the first low-voltage outgoing circuit breaker, and a split-field tripping device 1MX is arranged on the first low-voltage outgoing circuit breaker and connected to the programmable controller through a communication line;

[0014] A second outgoing circuit secondary load circuit is connected to the second low-voltage outgoing circuit breaker;

[0015] A third outgoing circuit primary load circuit is connected to the third low-voltage outgoing circuit breaker.

[0016] In the foregoing intelligent load unloading power distribution system of the hotel diesel generator set, the second low-voltage bus is provided with three outgoing circuit groups, which are respectively:

[0017] A fourth outgoing circuit primary load circuit is connected to the fourth low-voltage outgoing circuit breaker;

[0018] A fifth outgoing circuit secondary load circuit is connected to the fifth low-voltage outgoing circuit breaker;

[0019] A sixth outgoing circuit primary load circuit is connected to the sixth low-voltage outgoing circuit breaker, and a split-field tripping device 2MX is arranged on the sixth low-voltage outgoing circuit breaker and connected to the programmable controller through a communication line.

[0020] Compared with the prior art, the current value of the diesel generator set total outgoing circuit breaker is detected, the programmable controller and the split-field tripping device with current unloading and recovery functions are used, and the removal and input of the diesel generator set power supply load are dynamically and intelligently managed;

[0021] Compared with the power distribution system of the traditional diesel generator set only supplying the first and second level loads, the power distribution system wiring and control mode of the application not only ensures the power supply of the first and second level loads of the hotel in the state of the municipal power cut-off, but also maximally utilizes the diesel generator set to supply the third level load of the hotel, fully improves the utilization efficiency of the diesel generator set, and maximally guarantees the normal operation of the hotel.

[0022] Therefore, the utility model has the advantages of supplying the third level load of the hotel under the premise of guaranteeing the power supply of the first and second level important loads of the hotel, and guaranteeing the normal operation of the high-grade hotel. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the schematic diagram of the intelligent load unloading power distribution system of the diesel generator set for hotel.

[0024] The marks in the drawings are as follows: 11-first municipal power supply, 12-first power supply transformer, 13-first power supply transformer total outgoing circuit breaker, 14-first low-voltage bus, 21-second municipal power supply, 22-second power supply transformer, 23-second power supply transformer total outgoing circuit breaker, 24-second low-voltage bus, 31-diesel generator set, 32-diesel generator set total outgoing circuit breaker, 4-double power supply change-over switch, 41-first split position of the double power supply change-over switch, 42-second split position of the double power supply change-over switch, 5-low-voltage bus tie switch, 61-first low-voltage outgoing circuit breaker, 62-second low-voltage outgoing circuit breaker, 63-third low-voltage outgoing circuit breaker, 64-fourth low-voltage outgoing circuit breaker, 65-fifth low-voltage outgoing circuit breaker, 66-sixth low-voltage outgoing circuit breaker, 71-first outgoing circuit third level load, 72-second outgoing circuit second level load, 73-third outgoing circuit first level load, 74-fourth outgoing circuit first level load, 75-fifth outgoing circuit second level load, 76-sixth outgoing circuit third level load, 81-split excitation tripping device 1MX, 82-split excitation tripping device 2MX, 9-programmable controller. DETAILED DESCRIPTION

[0025] The utility model will be further described below in combination with the drawings and examples, but it is not as the basis for limiting the utility model.

[0026] Example. The intelligent load unloading power distribution system of the diesel generator set for hotel, such as Figure 1As shown, it comprises 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 a first power transformer 12, and after being stepped down, it is led to a first low-voltage bus 14 through a first power transformer total outgoing circuit breaker 13; the first low-voltage bus is shared by a first-level load, a second-level load and a third-level load, which are respectively: a first outgoing circuit third-level load 71 loop led out through a first low-voltage outgoing circuit breaker 61; a second outgoing circuit second-level load 72 loop led out through a second low-voltage outgoing circuit breaker 62; and a third outgoing circuit first-level load 73 loop led out through a third low-voltage outgoing circuit breaker 63.

[0027] The second municipal power supply 21 is connected to a second power transformer 22, and after being stepped down, it is led to a double power supply transfer switch first position 41 of a double power supply transfer switch 4 through a second power transformer total outgoing circuit breaker 23, as a municipal power supply line of the double power supply; the diesel generator set 31 is led to a double power supply transfer switch second position 42 of the double power supply transfer switch 4 through a diesel generator set total outgoing circuit breaker 32, as another standby power supply line of the double power supply; and the generator total outgoing circuit breaker is provided with a programmable controller 9 with current unloading and recovery functions.

[0028] When the double power supply transfer switch is switched to the double power supply transfer switch first position 41, the power supply is powered by the municipal power supply; and when the double power supply transfer switch is switched to the double power supply transfer switch second position 42, the power supply is powered by the diesel generator.

[0029] The outgoing circuit of the double power supply transfer switch is led to a second low-voltage bus 24, which is shared by a first-level load, a second-level load and a third-level load, which are respectively: a fourth outgoing circuit first-level load 74 loop led out through a fourth low-voltage outgoing circuit breaker 64; a fifth outgoing circuit second-level load 75 loop led out through a fifth low-voltage outgoing circuit breaker 65; and a sixth outgoing circuit first-level load 76 loop led out through a sixth low-voltage outgoing circuit breaker 66, which is provided with a split excitation tripping device 2MX82 connected to the programmable controller 9 with current unloading and recovery functions through a communication line.

[0030] The first low-voltage bus 14 and the second low-voltage bus 24 are connected through a low-voltage tie-in switch 5.

[0031] During normal power supply, the double power supply transfer switch is switched to the first position, and the low-voltage tie-in switch is in the off state, so that the two municipal power supplies supply power to the first low-voltage bus and the second low-voltage bus respectively.

[0032] When the city power is off, the system acts as follows: the first power transformer and the second power transformer lose power, at this time the diesel generator set total outgoing line breaker closes, the double power transfer switch switches to the second position of the double power transfer switch, the low-voltage contactor switch closes, and the first low-voltage bus and the second low-voltage bus are powered by the diesel generator.

[0033] The current value on the diesel generator set total outgoing line breaker is detected by the programmable controller with current unloading and recovery functions, and the upper and lower limit values of the system action current are set in the programmable controller in advance according to the capacity and operating characteristics of the diesel generator set.

[0034] If the measured current value does not exceed the upper limit value, it indicates that the operating load does not exceed the capacity of the diesel generator set, and then all the outgoing line breakers on the low-voltage bus do not act, and the hotel remains normal operation unaffected.

[0035] If the measured current value exceeds the upper limit value, it indicates that the operating load has exceeded the capacity value of the diesel generator set, and the diesel generator set is overloaded, and the programmable controller sends a load rejection action signal to the shunt release, the shunt release controls the corresponding outgoing line breaker to open, and the three-level load is sequentially cut off according to the priority set by the program until the current value on the diesel generator set total outgoing line breaker is lower than the upper limit value, and the cutting is stopped, the programmable controller sends a signal, the shunt release is reset, and the cut-off three-level load remains in the power-off state.

[0036] If the measured current value is lower than the lower limit value, it indicates that the capacity of the diesel generator set is still sufficient, and the programmable controller sends a signal to inform the operation and maintenance personnel to manually close the power-off three-level load according to the priority until the measured current reaches the upper limit value, and the closing is stopped.

[0037] By detecting the current value of the diesel generator set total outgoing line breaker, the programmable controller and the shunt release with current unloading and recovery functions are used to dynamically and intelligently manage the cutting and input of the diesel generator set power supply load. Compared with the traditional diesel generator set power distribution system that only supplies one or two-level load, the power distribution system and control mode of the utility model not only ensure the power supply of the one or two-level load of the hotel in the city power-off state, but also maximize the use of the diesel generator set to supply the three-level load of the hotel, fully improve the utilization efficiency of the diesel generator set, and maximize the protection of the normal operation of the hotel.

Claims

1. A hotel diesel generator set intelligent load unloading power distribution system, comprising a first municipal power supply, a second municipal power supply and a diesel generator set; characterized in that: The first municipal power source is connected to a first power transformer, and after voltage reduction, is led to a first low-voltage bus through a first power transformer total outgoing line circuit breaker; the first low-voltage bus is shared by primary load, secondary load and tertiary load; The second municipal power source is connected to a second power transformer, and after voltage reduction, is led to a first branch of a double power supply transfer switch of a double power supply transfer switch through a second power transformer total outgoing line circuit breaker, as a municipal power source incoming line of the double power supply; The diesel generator is led to a second branch of the double power supply transfer switch of the double power supply transfer switch through a diesel generator set total outgoing line circuit breaker, as another standby power source incoming line of the double power supply; An outgoing line of the double power supply transfer switch is led to a second low-voltage bus, and the second low-voltage bus is shared by primary load, secondary load and tertiary load; The first low-voltage bus and the second low-voltage bus are connected through a low-voltage bus tie switch; A programmable controller is arranged on the diesel generator set total outgoing line circuit breaker; the programmable controller has current unloading and recovery functions; The first low-voltage bus is provided with three groups of outgoing line circuits, including a first outgoing line tertiary load circuit led through a first low-voltage outgoing line circuit breaker, and a split excitation release 1MX arranged on the first low-voltage outgoing line circuit breaker and connected to the programmable controller through a communication line; The second low-voltage bus is provided with three groups of outgoing line circuits, including a sixth outgoing line primary load circuit led through a sixth low-voltage outgoing line circuit breaker, and a split excitation release 2MX arranged on the sixth low-voltage outgoing line circuit breaker and connected to the programmable controller through a communication line.

2. The intelligent load shed power distribution system for hotel diesel generator sets of claim 1, wherein, The first low-voltage bus is provided with three groups of outgoing line circuits, and further includes: a second outgoing line secondary load circuit led through a second low-voltage outgoing line circuit breaker; a third outgoing line primary load circuit led through a third low-voltage outgoing line circuit breaker.

3. The intelligent load shed power distribution system for hotel diesel generator sets of claim 1, wherein, The second low-voltage bus is provided with three groups of outgoing line circuits, and further includes: a fourth outgoing line primary load circuit led through a fourth low-voltage outgoing line circuit breaker; a fifth outgoing line secondary load circuit led through a fifth low-voltage outgoing line circuit breaker.

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