CN105258306B - An automatic demand response device and application method for a central air-conditioning system - Google Patents

Abstract

The present invention relates to an automatic demand response device and an application method for a central air-conditioning system. The automatic demand response device is deployed on the side of the central air-conditioning system, between the central air-conditioning system and the demand response server on the grid side; it includes: The data storage module, human-computer interaction module, communication module, security module, isolation module, interface module, real-time clock, watchdog and power management module that communicate with the microprocessor module in the shell; strategy, thereby realizing the coordinated control of the central air-conditioning system operating load in the demand response business; using the device and application method to improve the execution efficiency of the automatic demand response business, and changing the load adjustment mode of the central air-conditioning system under the traditional manual intervention mode , saving human resources and economic expenses.

Description

An automatic demand response device and application method for a central air-conditioning system

technical field

The invention relates to a response device and an application method, in particular to an automatic demand response device and an application method for a central air-conditioning system.

Background technique

In the hot summer, the excessive load of central air-conditioning leads to peak power consumption and power shortage in some areas, especially in the central and eastern coastal areas. This phenomenon is very obvious. The implementation of demand response for the central air-conditioning system, on the one hand, can alleviate the impact of power grid peaks on the safe and reliable operation of the power grid; on the other hand, it can improve the operating efficiency of the power system and reduce unnecessary waste of resources.

However, when the central air-conditioning system participates in demand response, it cannot automatically analyze the demand response signal sent by the demand response server, nor can it directly generate control commands for the air-conditioning unit or the air-conditioning host, pump, fan and other components inside the unit based on the demand response signal.

Contents of the invention

In order to solve the above problems, the present invention provides an automatic demand response device and application method for the central air-conditioning system, which provides technical support for the central air-conditioning system to participate in the demand response business, promotes the economical and efficient operation of the power system, and reduces the electricity bill of the central air-conditioning system users Expenditure is an important means to alleviate energy and environmental problems.

The object of the present invention is to adopt following technical scheme to realize:

An automatic demand response device for a central air-conditioning system, the automatic demand response device is deployed on the side of the central air-conditioning system, between the central air-conditioning system and the demand response server on the grid side; communicates with the demand response server through a communication network ; Communicate with the host control modules of each unit in the central air-conditioning system through a distributed bus or local area network, which includes: a microprocessor module, a data storage module, a human-computer interaction module, a communication module, and a security module arranged in the casing , an isolation module, an interface module, a real-time clock, a watchdog and a power management module; the interface module is bidirectionally connected to the microprocessor module through the isolation module; the microprocessor module is respectively connected to the data storage module, the human-computer interaction module, Communication module, security module, real-time clock, watchdog, isolation module, interface module and power management module communicate with each other.

Preferably, the microprocessor module is the core of the device, and is used for information interaction with the data storage module and the human-computer interaction module, so as to realize information reception, information transmission, information analysis, policy execution and command transmission;

The data storage module is used to store data and strategies;

The human-computer interaction module is used to provide users with information review and operation configuration of the demand response device;

The communication module is used to communicate with the grid-side demand response server through a communication network, and supports hot swapping;

The security module is used to verify the legitimacy of information sources and encrypt sensitive data; wherein the sensitive data includes demand response event feedback information and measurement information;

The isolation module is used to isolate the interface module from other modules;

The interface module is used to establish communication between the demand response device and the control modules of each unit host in the central air-conditioning system;

The watchdog is used to prevent the device from crashing and losing monitoring capabilities;

The real-time clock is used to provide accurate system time for the device to ensure that the time is not lost after power failure;

The power management module is used for managing and distributing the power supply of the device.

Preferably, the inside of the housing is coated with an electromagnetic shielding layer.

Preferably, the interface module includes RS485 interface, RS232 interface, RJ45 interface, analog quantity interface and digital quantity interface.

Further, the RS485, RS232, RJ45 interfaces communicate with each other between the central air-conditioning host control module and the parameter detection equipment; they are used to obtain the operating parameters of the central air-conditioning system, and at the same time issue control commands to the central air-conditioning system host;

The analog and digital interfaces communicate with the temperature and humidity sensors to obtain on-site environmental parameters; at the same time, they are connected to the relevant pipeline valves and baffle controllers of the central air-conditioning system to adjust the opening of the valves and baffles.

Preferably, the data storage module has a built-in demand response strategy library and a central air-conditioning operation regulation strategy library that support real-time updates; the demand response strategy library and the central air-conditioning operation regulation strategy library are used to store demand response strategies and central air-conditioning operation regulation. Strategy.

An application method of an automatic demand response device for a central air-conditioning system, the method comprising:

Step S701: The automatic demand response device receives the demand response event information sent by the grid-side demand response server through the communication network, obtains load reduction amount and electricity price change information through analysis, and selects an appropriate demand response strategy;

Step S702: Determine a specific response plan according to the corresponding demand response strategy and the current electrical parameters, operating state parameters and environmental parameters of the central air-conditioning system, and send a feedback signal to the grid-side demand response server;

Step S703: The response server automatically returns the confirmation signal according to the received feedback signal;

Step S704: The automatic demand response device forms a specific response level and response capacity according to the confirmed response plan, and generates a control command for the central air-conditioning system.

Further, the demand response strategy is used to transform the received demand response event into a response plan that matches the operating state parameters of the central air-conditioning system, and guide the central air-conditioning system to participate in demand response in an orderly manner according to the established plan;

The central air-conditioning operation control strategy is used to convert the response plan into control instructions for the central air-conditioning system; wherein, the response plan includes response level, response capacity, response participation objects and response time.

Preferably, the method for invoking the demand response strategy and the central air-conditioning system operation control strategy includes:

Step S901: the automatic demand response device receives the demand response event sent by the grid side demand response server through the communication network, and sends it to the microprocessor module for analysis;

Step S902: According to the parsed load reduction amount and electricity price change information, match the corresponding demand response strategy from the demand response strategy library built in the data storage module;

Step S903: Obtain the electrical parameters, operating state parameters and environmental parameters of the central air-conditioning system in the central air-conditioning control module and field sensors through the downlink interface unit, and upload them to the microprocessor module;

Step S904: The microprocessor module determines the response level and response capacity according to the demand response strategy and the received related parameters;

Step S905: sending a feedback signal to the demand response server;

Step S906: After receiving the confirmation signal sent by the demand response server, execute the corresponding central air-conditioning system operation regulation strategy according to the response level and response capacity.

Further, the specific method for executing the central air-conditioning system operation control strategy based on the fuzzy algorithm includes:

Step S907: According to the response level, it is judged whether the demand response is urgent demand response; if not, execute step S808, and the user chooses manual or automatic mode to implement the strategy of controlling the load;

Step S908: The user chooses to execute the demand response in an automatic or manual manner; if the automatic mode is selected, continue to step S909; if the manual mode is selected, the user will carry out the central air-conditioning system load according to the demand response event information and the demand response strategy. regulation;

Step S909: If the response capacity is greater than AKW, execute step S910; if not greater than AKW, execute step S911; wherein, the AKW is the maximum load capacity of a single central air-conditioning unit in the central air-conditioning system;

Step S910: The central air-conditioning system automatically adjusts the operating load of some central air-conditioning units in the central air-conditioning system or directly shuts down some central air-conditioning units according to the output result of the control strategy executed by the automatic demand response device;

Step S911: The central air-conditioning system automatically adjusts the operating load of some or a single central air-conditioning unit in the central air-conditioning system according to the output result of the control strategy executed by the automatic demand response device;

Step S912: when the demand response event ends, the data storage module records the start time, end time, electrical parameters and environmental parameters of the response process; and feeds the above information to the demand response server.

Further, the operation regulation strategy of the central air-conditioning system includes a multi-unit joint regulation instruction of the central air-conditioning system and a single-unit multi-component coordinated regulation instruction;

The multi-unit joint control instruction is used for joint control of the multi-unit central air conditioner, starting and stopping multiple units or adjusting the operating power of multiple units;

The single-unit multi-component coordinated control instruction is used for coordinated control of the central air-conditioning system host, chilled water system, and cooling water system related components, and adjusts and controls the operating speed or operating status of the air-conditioning host, pump, and fan.

Compared with prior art, the beneficial effect that the present invention reaches is:

1. In terms of participating in the automatic demand response business, the automatic demand response device of the central air-conditioning system can replace manual and automatic load control of the central air-conditioning system, avoiding unnecessary human resources expenditure;

2. The central air-conditioning system’s automatic demand response device has a built-in demand response strategy, which is based on a fuzzy algorithm, and can automatically determine who will participate in the automatic demand response based on the demand response event information from the grid-side demand response server, combined with its own operating parameters and environmental parameters Planning and arrangement, improving the execution efficiency of automatic demand response business;

3. The automatic demand response device of the central air-conditioning system has a built-in operation control strategy for the central air-conditioning system. This strategy is based on a fuzzy algorithm and can automatically perform load regulation on the central air-conditioning system according to the predetermined plan according to the response plan information confirmed by the demand response server on the grid side;

4. The automatic demand response device takes the minimum environmental condition requirements of industrial and commercial users as the constraint index. When implementing the operation control strategy, it adopts joint control of different units or coordinated control of different components in a single unit to ensure the indoor environment. The conditions meet the needs of industrial and commercial users.

Description of drawings

Fig. 1 is a schematic structural diagram of an automatic demand response device provided by the present invention;

Fig. 2 is a communication schematic diagram of the automatic demand response device provided by the present invention;

3 is a schematic diagram of the application of the automatic demand response device provided by the present invention;

Fig. 4 is a flow chart of executing the built-in strategy of the automatic demand response device provided by the present invention;

Detailed ways

As shown in Figure 2, an automatic demand response device for the central air-conditioning system, the automatic demand response device is deployed on the side of the central air-conditioning system, between the central air-conditioning system and the remote demand response server; The network communicates with the demand response server; according to the actual situation, select the field distributed bus or other local area network to communicate with the host control modules of each unit in the central air-conditioning system. It can collect the electrical parameters, operating state parameters and environmental parameters of the central air-conditioning system, and can regulate its operating state to respond to the demand response signal requirements of the grid side, including: a microprocessor module set in the shell, a data storage module, and a human-computer interaction module, communication module, safety module, isolation module, interface module, real-time clock, watchdog and power management module; the interface module is bidirectionally connected with the microprocessor module through the isolation module; the microprocessor module is respectively connected with the data storage The module, human-computer interaction module, communication module, security module, real-time clock, watchdog, isolation module, interface module and power management module communicate with each other.

As shown in Figure 1, the microprocessor module is the core of the device, and is used for information interaction with the data storage module and the human-computer interaction module, so as to realize information reception, information transmission, information analysis, policy execution and command transmission;

The data storage module is used to store data and strategies, and related strategies can be updated in real time; specifically, it includes electrical parameters, central air-conditioning host and various component operating status parameters, environmental parameters, relevant historical data, demand response strategy library, central air-conditioning operation Regulatory strategy library, etc.

The data storage module has a built-in demand response strategy library and a central air-conditioning operation control strategy library that support real-time updates; the demand response strategy library and the central air-conditioning operation control strategy library are used to store demand response strategies and central air-conditioning operation control strategies respectively.

The human-computer interaction module is used to provide users with information review and operation configuration of the demand response device; to facilitate debugging and configuration of the device;

The communication module is used to communicate with the grid-side demand response server through the communication network, and supports hot plugging

Wherein, the communication network includes communication methods such as wired, wireless or hybrid networks.

The security module is used to verify the legitimacy of the information source, specifically analyze and verify the validity of the configuration parameters of the device, demand response event information, etc., to prevent information from being maliciously tampered with; and encrypt sensitive data; wherein, The sensitive data, including demand response event feedback information and measurement information;

The isolation module is used to isolate the interface module from other modules; prevent other equipment connected to the device from affecting and damaging the device, and further improve the operation stability and reliability of the device;

The interface module is used to establish communication between the demand response device and the control modules of the hosts of each unit in the central air-conditioning system; complete the issuance of control commands, the collection and monitoring of the operating state parameters of each unit of the central air-conditioning system; and communicate with electrical parameters, etc. Collecting and monitoring equipment connection, receiving the electrical parameters of each host and related components during the operation of the central air-conditioning system; in addition, connecting with environmental parameter monitoring equipment such as temperature and humidity, and receiving relevant environmental parameters;

The interface module includes RS485 interface, RS232 interface, RJ45 interface, analog quantity interface and digital quantity interface.

RS485, RS232, RJ45 interfaces communicate with the central air-conditioning host control module and parameter detection equipment; used to obtain the operating parameters of the central air-conditioning system and issue control commands to the central air-conditioning system host;

The analog and digital interfaces communicate with the temperature and humidity sensors to obtain on-site environmental parameters; at the same time, they are connected to the relevant pipeline valves and baffle controllers of the central air-conditioning system to adjust the opening of the valves and baffles.

The watchdog is used to prevent the device from crashing and losing monitoring capability;

The real-time clock is used to provide accurate system time for the device to ensure that the time is not lost after power failure;

The power management module is used for managing and distributing the power supply of the device.

The inside of the shell is coated with an electromagnetic shielding layer, and the electromagnetic shielding layer is a polymer layer. It is conducive to improving the electromagnetic compatibility performance of the device and improving the operation reliability of the device in the complex environment on site.

As shown in Figure 3, an application method of an automatic demand response device for a central air-conditioning system, the method includes:

Step S701: The automatic demand response device receives the demand response event information sent by the grid-side demand response server through the communication network, obtains load reduction amount and electricity price change information through analysis, and selects an appropriate demand response strategy;

Step S702: Determine a specific response plan according to the corresponding demand response strategy and the current electrical parameters, operating state parameters and environmental parameters of the central air-conditioning system, and send a feedback signal to the grid-side demand response server;

Step S703: The response server automatically returns the confirmation signal according to the received feedback signal;

Step S704: The automatic demand response device forms a specific response level and response capacity according to the confirmed response plan, and generates a control command for the central air-conditioning system. Jointly adjust the operating status of individual units in the central air-conditioning system, or the main unit, circulating water pump and other components in a single unit.

The demand response strategy is used to convert the received demand response event into a response plan that matches the operating state parameters of the central air-conditioning system, and analyze the information such as load reduction demand and electricity price; guide the central air-conditioning system to participate in an orderly manner according to the established plan Demand response; wherein, the response plan includes response level, response capacity, response participants and response time. Response participants can be different units of the central air-conditioning system, or related components within a single unit.

The central air-conditioning operation control strategy is used to convert the response plan into a control instruction for the central air-conditioning system; it can jointly control the multi-unit central air-conditioning system, start or shut down some units; it can also control individual units in the central air-conditioning system. The relevant components of the unit are regulated, such as adjusting the operating load of the air conditioner main unit, the output temperature of chilled water, etc., or regulating the operating speed of related circulating water pumps, fans, and the opening of related valves and baffles.

The operation control strategy of the central air-conditioning system includes a multi-unit joint control command of the central air-conditioning system and a single unit multi-component cooperative control command; a multi-unit joint control command is used for joint control of the multi-unit central air conditioner, starting and stopping multiple units or Adjust the operating power of multiple units; the multi-component coordinated regulation command of a single unit is used for coordinated regulation of the central air-conditioning system host, chilled water system and cooling water system related components, and adjusts the operating speed or operating status of the air conditioner host, pump, and fan. Regulatory control.

As shown in Figure 4, the method for invoking the demand response strategy and the operation control strategy of the central air-conditioning system includes:

Step S901: the automatic demand response device receives the demand response event sent by the grid side demand response server through the communication network, and sends it to the microprocessor module for analysis;

Step S902: According to the parsed load reduction amount and electricity price change information, match the corresponding demand response strategy from the demand response strategy library built in the data storage module;

Step S903: Obtain the electrical parameters, operating state parameters and environmental parameters of the central air-conditioning system in the central air-conditioning control module and field sensors through the downlink interface unit, and upload them to the microprocessor module;

Step S904: The microprocessor module determines the response level and response capacity according to the demand response strategy and the received related parameters;

Step S905: sending a feedback signal to the demand response server;

Step S906: After receiving the confirmation signal sent by the demand response server, execute the corresponding central air-conditioning system operation regulation strategy according to the response level and response capacity.

The specific methods for executing the operation and control strategy of the central air-conditioning system based on the fuzzy algorithm include:

Step S907: According to the response level, it is judged whether the demand response is urgent demand response; if not, execute step S808, and the user chooses manual or automatic mode to implement the strategy of controlling the load;

Step S908: The user chooses to execute the demand response in an automatic or manual manner; if the automatic mode is selected, continue to step S909; if the manual mode is selected, the user will carry out the central air-conditioning system load according to the demand response event information and the demand response strategy. regulation;

Step S909: If the response capacity is greater than AKW, execute step S910; if not greater than AKW, execute step S911; wherein, the AKW is the maximum load capacity of a single central air-conditioning unit in the central air-conditioning system;

Step S910: The central air-conditioning system automatically adjusts the operating load of some central air-conditioning units in the central air-conditioning system or directly shuts down some central air-conditioning units according to the output result of the control strategy executed by the automatic demand response device;

The corresponding control strategy can be as follows: 1. Based on the fuzzy algorithm, intelligent frequency conversion control of the air conditioner host is performed to adjust the real-time motor speed. It has been verified in practice that through this strategy, the load of the motor drive system can be reduced by up to 30%. In a central air-conditioning system that is linked by more than five units, this control strategy can reduce the load by more than A kW, and at the same time, it will not cause a large instantaneous inrush current when the entire unit starts or stops, reducing the impact on the power grid;

2. Shut down the whole unit. This control strategy can intelligently shut down one or more units through a fuzzy algorithm when the previous strategy cannot meet the load reduction requirements. It has been verified in practice that after the implementation of this strategy, the load reduction response speed is fast and the load reduction is large. However, this strategy involves the start-up and shutdown of the entire unit, and there will be a large instantaneous inrush current, which may affect the power grid.

Step S911: The central air-conditioning system automatically adjusts the operating load of some or a single central air-conditioning unit in the central air-conditioning system according to the output result of the control strategy executed by the automatic demand response device; the adjustment object involves various components of a single unit, including Main engine, circulating water pump, fan, etc.;

The corresponding control strategy can be: 1. Based on the fuzzy algorithm, combined with the current state parameters and environmental parameters of the air conditioning system, intelligently control the chilled water system and cooling water system, and use intelligent frequency conversion control technology to change the flow and temperature of circulating water, without obvious Under the premise of affecting user comfort, reduce the load; 2. Based on the fuzzy algorithm, combined with the current state parameters and environmental parameters of the air conditioning system, intelligently control the fan system of the cooling tower, fully open the fan baffle, minimize the air duct resistance, and adjust Fan flow and speed, at this time the fan can still run efficiently, and the load can be reduced without affecting the user's comfort.

Step S912: when the demand response event ends, the data storage module records the start time, end time, electrical parameters and environmental parameters of the response process; and feeds the above information to the demand response server. At the same time, during the implementation of demand response, the relevant parameters of the central air-conditioning system will also be collected in real time and sent to the user control system or the monitoring system of the demand response actuator.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims (11)

1. An application method of an automatic demand response device for a central air-conditioning system, characterized in that the method comprises: Step S701: The automatic demand response device receives the demand response event information sent by the grid-side demand response server through the communication network, obtains the load reduction amount and electricity price change information through analysis, and selects the corresponding demand response strategy; Step S702: Determine a specific response plan according to the corresponding demand response strategy and the current electrical parameters, operating state parameters and environmental parameters of the central air-conditioning system, and send a feedback signal to the grid-side demand response server; Step S703: The response server automatically returns the confirmation signal according to the received feedback signal; Step S704: The automatic demand response device forms a specific response level and response capacity according to the confirmed response plan, and generates a control command for the central air-conditioning system. 2. The application method of an automatic demand response device for a central air-conditioning system as claimed in claim 1, wherein the demand response strategy is used to convert the received demand response event into an operating state of the central air-conditioning system A response plan with matching parameters to guide the central air-conditioning system to participate in demand response in an orderly manner according to the established plan; The central air-conditioning operation control strategy is used to convert the response plan into control instructions for the central air-conditioning system; wherein, the response plan includes response level, response capacity, response participation objects and response time. 3. the application method of a kind of automatic demand response device facing central air-conditioning system as claimed in claim 1, is characterized in that, the method for calling described demand response strategy and central air-conditioning system operation control strategy comprises: Step S901: the automatic demand response device receives the demand response event sent by the grid side demand response server through the communication network, and sends it to the microprocessor module for analysis; Step S902: According to the parsed load reduction amount and electricity price change information, match the corresponding demand response strategy from the demand response strategy library built in the data storage module; Step S903: Obtain the electrical parameters, operating state parameters and environmental parameters of the central air-conditioning system in the central air-conditioning control module and field sensors through the downlink interface unit, and upload them to the microprocessor module; Step S904: The microprocessor module determines the response level and response capacity according to the demand response strategy and the received related parameters; Step S905: sending a feedback signal to the demand response server; Step S906: After receiving the confirmation signal sent by the demand response server, execute the corresponding central air-conditioning system operation regulation strategy according to the response level and response capacity. 4. the application method of a kind of automatic demand response device facing central air-conditioning system as claimed in claim 3, it is characterized in that, based on fuzzy algorithm, the concrete method of carrying out central air-conditioning system operation control strategy comprises: Step S907: According to the response level, it is judged whether the demand response is urgent demand response; if not, execute step S908, and the user chooses manual or automatic mode to implement the load control strategy; Step S908: The user chooses to execute the demand response in an automatic or manual manner; if the automatic mode is selected, continue to step S909; if the manual mode is selected, the user will carry out the central air-conditioning system load according to the demand response event information and the demand response strategy. regulation; Step S909: If the response capacity is greater than AKW, execute step S910; if not greater than AKW, execute step S911; wherein, the AKW is the maximum load capacity of a single central air-conditioning unit in the central air-conditioning system; Step S910: The central air-conditioning system automatically adjusts the operating load of some central air-conditioning units in the central air-conditioning system or directly shuts down some central air-conditioning units according to the output result of the control strategy executed by the automatic demand response device; Step S911: The central air-conditioning system automatically adjusts the operating load of some or a single central air-conditioning unit in the central air-conditioning system according to the output result of the control strategy executed by the automatic demand response device; Step S912: the demand response event ends, and the data storage module records the demand response start time, end time, electrical parameters and environmental parameters of the response process; and records the above demand response start time, end time, electrical parameters and environmental parameters of the response process Feedback to demand response server. 5. The application method of an automatic demand response device for a central air-conditioning system as claimed in claim 4, wherein the central air-conditioning system operation control strategy includes a central air-conditioning system multi-unit joint control command and a single unit multi-unit Component coordinated control instructions; The multi-unit joint control instruction is used for joint control of the multi-unit central air conditioner, starting and stopping multiple units or adjusting the operating power of multiple units; The single-unit multi-component coordinated control instruction is used for coordinated control of the central air-conditioning system host, chilled water system, and cooling water system related components, and adjusts and controls the operating speed or operating status of the air-conditioning host, pump, and fan. 6. An automatic demand response device for a central air-conditioning system used in the application method of claim 1, wherein the automatic demand response device is deployed on the side of the central air-conditioning system, between the central air-conditioning system and the power grid between the demand response servers on the side; communicate with the demand response server through the communication network on the upper side; communicate with the host control modules of each unit in the central air-conditioning system through the distributed bus or local area network on the lower side, which includes: the micro Processor module, data storage module, human-computer interaction module, communication module, security module, isolation module, interface module, real-time clock, watchdog and power management module; the interface module is bidirectionally connected to the microprocessor module through the isolation module The microprocessor module is respectively connected with the data storage module, human-computer interaction module, communication module, security module, real-time clock, watchdog, isolation module and power management module. 7. A kind of automatic demand response device facing the central air-conditioning system as claimed in claim 6, characterized in that: The microprocessor module is the core of the device, and is used for information interaction with the data storage module and the communication module, so as to realize information reception, information transmission, information analysis, policy execution and command transmission; The data storage module is used to store data and policies; The human-computer interaction module is used to provide users with information review and operation configuration of the demand response device; The communication module is used to communicate with the grid-side demand response server through a communication network, and supports hot swapping; The security module is used to verify the legitimacy of information sources and encrypt sensitive data; wherein the sensitive data includes demand response event feedback information and measurement information; The isolation module is used to isolate the interface module from other modules; The interface module is used to establish communication between the demand response device and the control modules of each unit host in the central air-conditioning system; The watchdog is used to prevent the device from crashing and losing monitoring capabilities; The real-time clock is used to provide accurate system time for the device to ensure that the time is not lost after power failure; The power management module is used for managing and distributing the power supply of the device. 8 . The automatic demand response device for a central air-conditioning system according to claim 6 , wherein the inside of the housing is coated with an electromagnetic shielding layer. 9 . The automatic demand response device for central air-conditioning system according to claim 6 , wherein the interface module includes RS485 interface, RS232 interface, RJ45 interface, analog quantity interface and digital quantity interface. 10. A kind of automatic demand response device facing the central air-conditioning system as claimed in claim 9, characterized in that, said RS485, RS232, RJ45 interfaces communicate with each other between the central air-conditioning host control module and the parameter detection equipment; Obtain the operating parameters of the central air-conditioning system and issue control commands to the central air-conditioning system host at the same time; The analog and digital interfaces communicate with the temperature and humidity sensors to obtain on-site environmental parameters; at the same time, they are connected to the relevant pipeline valves and baffle controllers of the central air-conditioning system to adjust the opening of the valves and baffles. 11. A kind of automatic demand response device facing central air-conditioning system as claimed in claim 6, it is characterized in that, described data storage module built-in supports the demand response policy storehouse of real-time update and central air-conditioning operation control policy storehouse; The response strategy library and the central air-conditioning operation regulation strategy library are used to store demand response strategies and central air-conditioning operation regulation strategies respectively.