Waste heat power generation island operation control method and system
阅读说明：本技术 余热发电孤岛运行控制方法及系统 (Waste heat power generation island operation control method and system ) 是由 龚敏 于 2019-09-20 设计创作，主要内容包括：一种余热发电孤岛运行控制方法及系统,通过将重要的第一负载连接在余热发电母线上,并当外部电网处于故障状态和/或接收到孤岛运行指令时,根据预设操作指令切断余热发电电源与外部电网的连接并转孤岛运行,从而使得余热发电电源可作为孤岛电源为第一负载持续供电,避免了传统技术方案中因外部电网或厂内电网发生故障跳闸时也会让余热发电跳闸而导致余热发电不能持续为重要负荷供电的问题。(A waste heat power generation island operation control method and a system thereof are characterized in that an important first load is connected to a waste heat power generation bus, when an external power grid is in a fault state and/or receives an island operation instruction, a waste heat power generation power supply is cut off from the external power grid according to a preset operation instruction and is switched to island operation, so that the waste heat power generation power supply can be used as the island power supply to continuously supply power for the first load, and the problem that the waste heat power generation can not continuously supply power for the important load due to the fact that the waste heat power generation is tripped when the external power grid or an in-plant power grid is in fault tripping in the traditional technical scheme is solved.)
1. A method for controlling the operation of a waste heat power generation island is characterized by comprising the following steps:
acquiring operating parameters of an external power grid;
judging whether the external power grid is in a fault state or not according to the operating parameters of the external power grid;
judging whether an island operation instruction is received or not;
when the external power grid is in a fault state and/or an island operation instruction is received, the connection between the waste heat power generation power supply and the external power grid is cut off according to a preset operation instruction and the external power grid is switched to island operation;
when the external power grid is not in a fault state and does not receive an island operation instruction, the waste heat power generation power supply continues to be in grid-connected operation;
the waste heat power generation power supply comprises a waste heat power generation bus and a waste heat generator, and the waste heat generator is connected with at least one first load through the waste heat power generation bus.
2. The method for controlling operation of an islanding with waste heat power generation according to claim 1, wherein generating the preset operation command comprises:
acquiring preset fault parameters of the external power grid;
acquiring line parameters of the waste heat power generation bus;
acquiring the loadable load quantity and the actual loaded load quantity of the waste heat power generation;
generating a first preset operation instruction according to the preset fault parameter, the line parameter, the loadable load capacity and the actual loaded load capacity, wherein the first preset operation instruction is used for controlling a waste heat grid-connected cabinet switch and a waste heat incoming cabinet switch to be simultaneously disconnected when the external power grid is in a fault state and/or an island operation instruction is received;
and generating a second preset operation instruction according to the preset fault parameter of the external power grid, wherein the second preset operation instruction is used for controlling a switch connected with the waste heat power generator and the waste heat power generation bus to be closed or to be kept closed when the external power grid is in a fault state and/or an island operation instruction is received.
3. The method for controlling operation of an islanding by waste heat power generation according to claim 2, wherein the obtaining of the chargeable amount of the waste heat power generation comprises:
acquiring the generated energy of the waste heat generator;
acquiring the self-power consumption of the waste heat power generation power supply;
and calculating the chargeable load capacity of the waste heat power generation according to the generated energy of the waste heat generator and the self-power consumption of the waste heat power generation power supply.
4. The islanding operation control method according to claim 1, wherein the fault state of the external power grid is at least one of a phase-to-phase short-circuit fault, a transient loss-of-voltage fault, a phase-to-ground short-circuit fault and a phase-loss fault.
5. The method for controlling the operation of the cogeneration island according to any one of claims 1 to 4, wherein after the cogeneration enters the island operation, the method further comprises:
acquiring the current actual load capacity of the waste heat power generation bus;
acquiring operation parameters of each load connected to the waste heat power generation bus;
and generating a first control instruction according to the actual load carrying capacity and the operation parameters of each load, wherein the first control instruction is used for adjusting the output power of the generator for waste heat power generation.
6. The method for controlling operation of an islanding with waste heat power generation as claimed in any one of claims 1-4, further comprising:
and when the external power grid is in a fault state, the waste heat power generation power supply does not enter into island operation within a preset time interval, and an alarm is given.
7. The utility model provides a cogeneration island operating system which characterized in that includes:
a waste heat generator;
the waste heat power generation bus is used for being connected with the waste heat power generation and at least one first load; and
the waste heat power generation grid-connected cabinet switch comprises a waste heat power generation grid-connected cabinet switch, wherein a first end of the waste heat power generation grid-connected cabinet switch is connected with a waste heat power generation bus, a second end of the waste heat power generation grid-connected cabinet switch is connected with an external power grid, and the waste heat power generation grid-connected cabinet switch is used for cutting off the connection between the waste heat power generation bus and the external power grid when the external power grid is in a fault state and/or receives an island operation instruction.
8. The cogeneration island operation system of claim 7 further comprising a cogeneration inlet cabinet switch interlocked with the cogeneration grid-connected cabinet switch, the cogeneration inlet cabinet switch connected in series between the cogeneration grid-connected cabinet switch and the external grid.
9. The cogeneration islanded operating system of claim 8, further comprising an internal grid bus connected in series between the cogeneration inlet cabinet switch and the external grid, the internal grid bus being configured to connect at least one second load.
10. The isolated island operation system for waste heat power generation according to any one of claims 7-9, further comprising an alarm module, wherein the alarm module is connected with the switch of the grid-connected waste heat power generation cabinet, and the alarm module is used for giving an alarm when the waste heat power generator does not enter into isolated island operation within a preset time interval after the external power grid is in a fault state.
Technical Field
The invention belongs to the technical field of power supply control, and particularly relates to a method and a system for controlling the operation of a waste heat power generation island.
Background
At present, a waste heat power generation facility is built in a common industrial kiln enterprise, but the waste heat power generation is usually only connected with a main power grid in a factory in a grid-connected mode, so that once an external power grid fluctuates, a power source for the waste heat power generation also fluctuates along with the fluctuation, the waste heat power generation can be tripped when the external power grid or the power grid in the factory breaks down and trips, and when the external power grid is abnormally powered off, the waste heat power generation power source cannot continuously supply power for important loads, so that a large amount of energy loss and economic loss are caused.
Therefore, the problem that when the external power grid is abnormally powered off, the waste heat power generation power supply and the external power grid are disconnected together so that the important load cannot be continuously supplied power exists in the traditional technical scheme.
Disclosure of Invention
In view of this, the embodiment of the invention provides a method and a system for controlling operation of a waste heat power generation island, and aims to solve the problem that a waste heat power generation power supply cannot continuously supply power to an important load when an external power grid is abnormally powered off in the conventional technical scheme.
A first aspect of an embodiment of the present invention provides a method for controlling operation of a waste heat power generation island, including:
acquiring operating parameters of an external power grid;
judging whether the external power grid is in a fault state or not according to the operating parameters of the external power grid;
judging whether an island operation instruction is received or not;
when the external power grid is in a fault state and/or an island operation instruction is received, the connection between the waste heat power generation power supply and the external power grid is cut off according to a preset operation instruction and the external power grid is switched to island operation;
when the external power grid is not in a fault state and does not receive an island operation instruction, the waste heat power generation power supply continues to be in grid-connected operation;
the waste heat power generation power supply comprises a waste heat power generation bus and a waste heat generator, and the waste heat generator is connected with at least one first load through the waste heat power generation bus.
In one embodiment, generating the preset operation instruction comprises:
acquiring preset fault parameters of the external power grid;
acquiring line parameters of the waste heat power generation bus;
acquiring the loadable load quantity and the actual loaded load quantity of the waste heat power generation;
generating a first preset operation instruction according to the preset fault parameter, the line parameter, the loadable load capacity and the actual loaded load capacity, wherein the first preset operation instruction is used for controlling a waste heat grid-connected cabinet switch and a waste heat incoming cabinet switch to be simultaneously disconnected when the external power grid is in a fault state and/or an island operation instruction is received;
and generating a second preset operation instruction according to the preset fault parameter of the external power grid, wherein the second preset operation instruction is used for controlling a switch connected with the waste heat power generator and the waste heat power generation bus to be closed or to be kept closed when the external power grid is in a fault state and/or an island operation instruction is received.
In one embodiment, the obtaining the chargeable amount of cogeneration comprises:
acquiring the generated energy of the waste heat generator;
acquiring the self-power consumption of the waste heat power generation power supply;
and calculating the chargeable load capacity of the waste heat power generation according to the generated energy of the waste heat generator and the self-power consumption of the waste heat power generation power supply.
In one embodiment, the fault condition of the external power grid is at least one of a phase-to-phase short-circuit fault, a transient voltage loss fault, a phase-to-ground short-circuit fault, and a phase-loss fault.
In one embodiment, after the cogeneration enters island operation, the method further comprises:
acquiring the current actual load capacity of the waste heat power generation bus;
acquiring operation parameters of each load connected to the waste heat power generation bus;
and generating a first control instruction according to the actual load carrying capacity and the operation parameters of each load, wherein the first control instruction is used for adjusting the output power of the generator for waste heat power generation.
In one embodiment, the method for controlling the operation of the cogeneration island further comprises sending an alarm when the cogeneration power supply does not enter the island operation within a preset time interval after the external power grid is in the fault state.
A second aspect of an embodiment of the present invention provides a waste heat power generation island operation system, including:
a waste heat generator;
the waste heat power generation bus is used for being connected with the waste heat power generation and at least one first load; and
the waste heat power generation grid-connected cabinet switch comprises a waste heat power generation grid-connected cabinet switch, wherein a first end of the waste heat power generation grid-connected cabinet switch is connected with a waste heat power generation bus, a second end of the waste heat power generation grid-connected cabinet switch is connected with an external power grid, and the waste heat power generation grid-connected cabinet switch is used for cutting off the connection between the waste heat power generation bus and the external power grid when the external power grid is in a fault state and/or receives an island operation instruction.
In one embodiment, the system further comprises a waste heat power generation inlet cabinet switch, the waste heat power generation inlet cabinet switch is interlocked with the waste heat power generation grid-connected cabinet switch, and the waste heat power generation inlet cabinet switch is connected between the waste heat power generation grid-connected cabinet switch and the external power grid in series.
In one embodiment, the system further comprises an internal grid bus, the internal grid bus is connected in series between the waste heat power generation inlet cabinet switch and the external grid, and the internal grid bus is used for connecting at least one second load.
In one embodiment, the system for operating an isolated island of waste heat power generation further comprises an alarm module, the alarm module is connected with the switch of the waste heat power generation grid-connected cabinet and the waste heat power generator, and the alarm module is used for giving an alarm when the waste heat power generation power supply does not enter the isolated island operation within a preset time interval after the external power grid is in a fault state.
According to the method and the system for controlling the operation of the waste heat power generation island, the important first load is connected to the waste heat power generation bus, and when the external power grid is in a fault state and/or receives an island operation instruction, the connection between the waste heat power generation power supply and the external power grid is cut off according to the preset operation instruction and the island operation is carried out, so that the waste heat power generation power supply can be used as the island power supply to continuously supply power for the first load, and the problem that the waste heat power generation can not be continuously supplied power for the important load due to the fact that the waste heat power generation is tripped when the external power grid or the power grid in a plant is in a fault trip in the traditional technical scheme.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a specific flowchart of a method for controlling operation of a cogeneration island according to a first aspect of an embodiment of the present invention;
fig. 2 is a detailed flowchart of step S400 in the method for controlling operation of a cogeneration island shown in fig. 1;
fig. 3 is a detailed flowchart of step S430 in the method for controlling operation of an islanded thermal power generation shown in fig. 2;
fig. 4 is another specific flowchart of a method for controlling operation of a cogeneration island according to an embodiment of the present invention;
fig. 5 is another specific flowchart of a method for controlling operation of a cogeneration island according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a cogeneration island operating system provided by a second aspect of an embodiment of the invention;
fig. 7 is another schematic diagram of a cogeneration island operating system provided by a second aspect of an embodiment of the invention;
fig. 8 is another schematic diagram of a cogeneration island operating system provided by the second aspect of the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a specific flowchart of a method for controlling an islanding operation of a cogeneration system according to an embodiment of the present invention is shown, for convenience of description, only the relevant portions of the embodiment are shown, and the detailed description is as follows:
a method for controlling the operation of a waste heat power generation island comprises the following steps:
step S100: acquiring operating parameters of an external power grid;
it should be understood that the external power grid in this embodiment may be a utility power grid, and the operation parameters of the external power grid include voltage phasor, current phasor, frequency, active power, reactive power, and the like of the power grid; the method comprises the following steps that test devices such as a voltage transformer and a current transformer can be arranged at an inlet wire of a mains power grid to obtain real-time operation parameters of an external power grid, and the test devices can be directly transmitted to equipment used for controlling waste heat power generation grid connection or isolated island operation in a waste heat power generation system in a wired mode or a wireless mode after obtaining the real-time operation parameters of the external power grid; the real-time operation parameters of the power grid collected by the real-time monitoring system can also be read through the communication with the real-time monitoring system of the external power grid.
Step S200: judging whether the external power grid is in a fault state according to the operation parameters of the external power grid;
it should be understood that the fault condition of the external power grid is at least one of a phase-to-phase short circuit fault, a transient voltage loss fault, a phase-to-ground short circuit fault, and a phase-loss fault.
It should be understood that the obtained real-time operating parameters of the external power grid may be compared with the reference operating parameters of the external power grid during normal operation, so as to determine whether the external power grid is in a fault state and which type of fault state.
Step S300: judging whether an island operation instruction is received or not;
it should be understood that the islanding operation instruction may be automatically issued, for example, when it is recognized that the external power grid is in a fault state, the islanding operation instruction may be directly generated; the island operation instruction can also be sent out passively, for example, when an external power grid needs to be overhauled or other situations needing to enable waste heat power generation to enter island operation, the island operation instruction can be manually input by a user.
It should be understood that whether an island operation instruction is received or not can be judged by reading operation parameters of each device in a power system where the waste heat power generation is located or signals of microcomputer devices such as a comprehensive protector.
Step S400: when the external power grid is in a fault state and/or receives an island operation instruction, the connection between the waste heat power generation power supply and the external power grid is cut off according to a preset operation instruction and the external power grid is switched to island operation;
it should be understood that the waste heat power generation power supply and the external power grid should be connected with a switch with a protection function, the connection between the waste heat power generation power supply and the external power grid can be cut off according to a preset operation instruction, and the island operation can be realized by setting numerical values such as a comprehensive protection fixed value of the switch so that the switch can be tripped in time under a specific condition, the connection between the waste heat power generation power supply and the external power grid can be cut off, and the waste heat power generation power supply can be rapidly changed into an island operation state.
Referring to fig. 2, in an embodiment, generating the preset operation command includes:
step S410: acquiring preset fault parameters of an external power grid;
it should be understood that the preset fault parameter may be a fault parameter of a conventional power grid, and may be obtained by communicating with an energy management system of an external power grid; the preset fault parameter may be a parameter that is set by a user in an auxiliary manner according to a load condition of the power supply system of the user.
Step S420: acquiring line parameters of a waste heat power generation bus according to the actual load capacity of waste heat power generation;
it should be understood that line parameters such as current and voltage of the cogeneration bus can be obtained by arranging a voltage transformer, a current transformer and the like on the cogeneration bus.
Step S430: acquiring the loadable load quantity and the actual loaded load quantity of the waste heat power generation;
it should be appreciated that, in one embodiment, referring to FIG. 3, obtaining the chargeable amount of cogeneration comprises:
step S431: acquiring the generated energy P of the waste heat generator;
step S432: acquiring the self-power consumption P1 of the waste heat power generation power supply;
step S433: and calculating the chargeable load capacity P2 of the waste heat power generation according to the generated energy P of the waste heat generator and the self-power consumption P1 of the waste heat power generation power supply, wherein P2 is less than P-P1.
Step S440: generating a first preset operation instruction according to a preset fault parameter, a line parameter, a loadable load and an actual loaded load, wherein the first preset operation instruction is used for controlling a switch of a waste heat grid-connected cabinet and a switch of a waste heat incoming cabinet to be simultaneously disconnected when an external power grid is in a fault state and/or an island operation instruction is received;
it should be understood that the first preset operation command may be an action fixed value of a comprehensive protector for controlling the opening or closing of a waste heat grid-connected cabinet switch and a waste heat incoming line cabinet switch or an action fixed value of a switch integrated with the comprehensive protector, the first preset operation command may be a quick-break protection action fixed value, an overcurrent protection fixed value, a voltage loss fixed value, a low-cycle load shedding fixed value, and the like, and the first preset operation command may be obtained by performing load flow calculation on preset fault parameters, line parameters, a loadable load amount, and an actual loaded load amount.
Step S450: and generating a second preset operation instruction according to the preset fault parameters of the external power grid, wherein the second preset operation instruction is used for controlling a switch connected with the waste heat power generator and a waste heat power generation bus to be closed or to be kept closed when the external power grid is in a fault state and/or an island operation instruction is received.
It should be understood that the second preset operation command may be an action set value of a comprehensive protector for controlling the opening or closing of a switch for connecting the waste heat generator with the waste heat power generation bus or an action set value of a switch integrated with the comprehensive protector, the second preset operation command may be a quick-break protection action set value, an overcurrent protection set value, a voltage loss set value, a low-cycle load shedding set value, and the like, the second preset operation command should be capable of avoiding fault parameters of an external power grid, so that the waste heat generator can enter an isolated island operation, and the situation that a type of load connected with the waste heat power generation bus stops operating due to the opening of the waste heat generator with the external power grid is avoided, taking the low-cycle load shedding set value as an example, the low-cycle value of the first preset operation command may be 49HZ, the action time is 0.5S, and the low-cycle value of the second preset operation command may be 48HZ, the action time is 40S, when the frequency of an external power grid is reduced due to faults, the waste heat grid-connected cabinet switch and the waste heat incoming line cabinet switch are quickly disconnected according to the first preset operation instruction, and the second preset operation instruction for controlling the waste heat generator does not reach the action condition, so that the switch connected with the waste heat power generation bus is kept closed, and the waste heat generator is converted into island operation.
Step S500: and when the external power grid is not in a fault state and does not receive an island operation instruction, the waste heat power generation power supply continues to be connected to the grid for operation.
The waste heat power generation power supply in the embodiment comprises a waste heat power generation bus and a waste heat generator, and the waste heat generator is connected with at least one first load through the waste heat power generation bus.
It should be understood that the power supply for generating power by waste heat also includes a waste heat boiler, for example, in the kiln industrial plant area, the waste heat boiler exchanges and recovers a large amount of waste heat of low-grade medium-low temperature waste gas discharged from the head and the tail of the kiln in the kiln industrial plant area, generates superheated steam to drive the steam turbine to realize conversion of heat energy into mechanical energy, and drives the waste heat generator to generate electric energy.
It should be understood that the first load in this embodiment is the load with the highest importance level in the power supply system, i.e., a type of load, and the user sets the first load to be classified according to his/her production demand and load importance level.
It should be understood that when the fault state of the external power grid is removed or a grid-connected operation instruction is received, the waste heat power generation power supply can be accessed to the external power grid for grid-connected operation only when the phase sequence, the voltage, the current, the frequency and the like of the waste heat power supply are consistent with those of the external power grid.
It should be understood that, for plants with waste heat power generation conditions, such as various kiln industry plants, the kiln industry plants generally have the characteristics of high energy consumption, multiple types of motors, large capacity, high voltage level and the like, and a large amount of energy consumption loss is caused when the whole production line is started and stopped once, so that a great economic burden is brought to enterprises. However, the power supply around the general kiln industrial plant is a small hydropower plant, the power supply reliability is low, the power grid is unstable, the situations of power failure, power grid fluctuation and the like often occur, the melting furnaces of the kiln industrial enterprises particularly depend on the stable operation of various combustion-supporting and cooling fans and combustion systems during operation, when a power failure accident occurs, the production loss of the enterprises is caused slightly, and the production safety accident of the enterprises is caused seriously. Therefore, when the external power supply of the kiln industry enterprise breaks down, the minimum operation load in the kiln industry enterprise is ensured, the production stability can be maintained, and the production safety accidents can be avoided. However, although an industrial kiln enterprise is built with a waste heat power generation facility, the waste heat power generation is not considered to be used as an island power supply of the industrial kiln enterprise at the beginning of construction, the waste heat power generation is simply connected with a main power grid in a factory in a grid-connected mode, once an external power grid fluctuates, a power supply for the waste heat power generation also fluctuates along with the fluctuation, the waste heat power generation is also tripped when the external power grid or the power grid in the factory breaks down and trips, and the production loss caused by the tripping cannot be estimated.
Therefore, in the method for controlling the operation of the waste heat power generation island in the embodiment, when the waste heat power generation island is in a fault state and/or receives an island operation instruction, the connection between the waste heat power generation power supply and an external power grid is cut off and the waste heat power generation power supply is converted into the island operation, so that the waste heat power generation power supply can continuously supply power to important loads on a waste heat power generation bus, and production and economic losses caused by simultaneous tripping of the waste heat power generation power supply due to faults of the external power grid are.
Referring to fig. 4, in an embodiment, after the cogeneration enters the islanding operation, the method further includes:
step S600: acquiring the current actual load capacity of the waste heat power generation bus;
step S700: acquiring operation parameters of each load connected to a waste heat power generation bus;
it should be understood that the operating parameters of each load include real-time voltage, current, frequency, etc. parameters of each load.
Step S800: and generating a first control instruction according to the actual load carrying capacity and the operation parameters of each load, wherein the first control instruction is used for adjusting the output power of the generator for waste heat power generation.
It should be understood that the actual load capacity should be less than the maximum outputtable power of the cogeneration generator.
In this embodiment, the output power of the generator for waste heat power generation is adjusted in real time by obtaining the current actual load capacity of the waste heat power generation bus and the operation parameters of each load connected to the waste heat power generation bus, so that the output power of the generator for waste heat power generation is just matched with the demand of each load, thereby avoiding each load from being broken down due to insufficient output power of the generator, and also avoiding energy waste due to overlarge output power of the generator.
Referring to fig. 5, in an embodiment, the method further includes step S900: when the external power grid is in a fault state, the waste heat power generation power supply does not enter into island operation within a preset time interval, and an alarm is given out.
It should be understood that the alarm can be realized by arranging an alarm connected with a comprehensive protector of the waste heat power generation grid-connected cabinet switch; the preset time interval may be a time interval required to cut off the connection of the cogeneration power supply with the external power grid according to a preset operation instruction.
Referring to fig. 6, a second aspect of the embodiment of the present invention provides a system for operating an islanding by waste heat power generation, including: the system comprises a
It should be understood that the
Optionally, each device or device in the operation system of the waste heat power generation island is provided with a current transformer, a voltage transformer and other testing devices for acquiring data such as line parameters and external power grid operation parameters, and each testing device is electrically connected or communicatively connected with the switch Q1 of the waste heat power generation grid-connected cabinet and the waste
Optionally, the system further comprises a plurality of input panels respectively connected with the waste heat power generation grid-connected cabinet switch Q1 and the
It should be understood that each first load is connected to the
It is understood that the first load is the highest level of importance of all connected loads in the system, i.e. a class of loads, e.g. in a kiln industry plant, the first load may be a fan for drawing medium and low temperature flue gas, an environmental protection system ensuring up to standard emissions during production, a combustion system, a fan for minimum safe operation of kiln cooling for kiln industry enterprises, a minimum cooling water system for equipment and kilns, etc.;
in this embodiment, at least one first load is connected to the waste heat
Referring to fig. 7, in an embodiment, the system further includes a waste heat power generation inlet cabinet switch Q2, the waste heat power generation inlet cabinet switch Q2 is interlocked with the waste heat power generation grid-connected cabinet switch Q1, and the waste heat power generation inlet cabinet switch Q2 is connected in series between the waste heat power generation grid-connected cabinet switch Q1 and an external power grid.
It should be understood that the linkage between the waste heat power generation inlet cabinet switch Q2 and the waste heat power generation grid-connected cabinet switch Q1 may be a hard-wired linkage or a software linkage.
Referring to fig. 8, in an embodiment, the system further includes an
It should be understood that, in the present embodiment, the second load should be a load of an important order next to the first load.
In one embodiment, the power supply system further comprises an alarm module, wherein the alarm module is connected with a waste heat power generation grid-connected cabinet switch Q1, and the alarm module is used for giving an alarm when the waste heat power generation power supply does not enter into island operation within a preset time interval after the external power grid is in a fault state.
It should be understood that alarm module can constitute by sound production device and communications facilities, and wherein, sound production device can be bee calling organ, the LED lamp of taking bee calling organ, loudspeaker etc. and communications facilities can be wired communications facilities or wireless communications facilities, and wired communications facilities can be serial communication interface, and wireless communications facilities can be WIFI module or bluetooth module etc..
In this embodiment, by adding the alarm module, when an external power grid fails, if the
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
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