Diesel generating set power supply connecting device and method based on power demand response

Abstract

The invention discloses a diesel generating set power supply connecting device and method based on power demand response, and the device receives a power demand response signal in real time through a first external signal input end of a master controller, and enables a user power distribution system to achieve the marketization response of a power demand side according to a predetermined mode. The operation mode comprises the following steps: when no power demand response signal exists, the master controller does not output a control signal, and the special bus in the device is powered by the mains supply; when the device receives a power demand response signal, the device controls the diesel generating set to start, and controls the diesel generating set and the commercial power to operate in a grid-connected manner through the synchronization unit; and for a system which does not allow reverse power, after a reverse power signal is received, the master controller controls the diesel generating set to be converted into isolated island operation. According to the invention, the diesel generator set provided by a user can be used as a distributed power supply to participate in marketization response of a power demand side, peak regulation demands of a power grid in peak periods are met, and supply and demand toughness of an urban power grid is improved.

Description

Technical Field

[0001] The invention relates to the technical field of diesel generator sets, and in particular to a power supply connection device and method for a diesel generator set based on power demand response. Background Art

[0002] With the rise of AI technology, the improvement of related computing power, and the increase in the electrification rate of equipment, society's demand for electricity is growing year by year. With the advancement of the construction of new power systems and the increase in the proportion of renewable energy in the power system, the stability and security of the power grid are becoming increasingly important. On the other hand, increasingly frequent extreme weather has led to a surge in electricity demand, and unpredictable abnormal climate has led to insufficient output of hydropower and new energy, resulting in a large gap in electricity supply. It is particularly important to ensure the supply of electricity.

[0003] For civil buildings, it is a common solution to set up self-contained diesel generator sets as backup / emergency power sources according to fire protection needs. However, as a backup power source, diesel generator sets will only be put into operation after the city power outage to provide power for security and important loads, and the utilization rate is very low. Summary of the invention

[0004] The purpose of the present invention is to provide a diesel generator power connection device and method based on power demand response. The present invention provides a diesel generator power connection device for buildings or parks equipped with self-contained diesel generators. When a demand response signal is received, the device controls the diesel generator to start and run, and realizes power demand response according to a predetermined plan. The present invention mainly solves the abnormal problem of tight power supply in the power grid under extreme weather conditions, makes full use of idle self-contained diesel generators in civil buildings, participates in the market-oriented response on the power demand side, meets the peak load demand of the power grid during peak hours, and improves the resilience of supply and demand of urban power grids.

[0005] The present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a diesel generator set power connection device based on power demand response, the device comprising a first switch, a second switch, a dedicated bus, a metering unit and a master controller; the first switch is a mains power switch, and the second switch is a diesel generator set power switch; the inlet end of the second switch is connected to the power output end of the diesel generator set outside the device, the outlet end of the second switch is connected to the dedicated bus, the outlet end of the first switch is connected to the dedicated bus, and the inlet end of the first switch is connected to the mains power supply outside the device; the outlet end of the second switch is provided with a metering unit;

[0007] The control signal end of the first switch is connected to the first internal control signal end of the master controller, the control signal end of the second switch is connected to the second internal control signal end of the master controller, and the signal output end of the metering unit is connected to the second internal signal input end of the master controller;

[0008] The device receives a power demand response signal in real time through the first external signal input terminal of the master controller. When there is no power demand response signal, the master controller does not output a control signal. At this time, the first switch is in a closed state and the second switch is in an open state. When a power demand response signal is received, the master controller outputs a first control signal to the diesel generator controller through the first external signal output terminal to start the diesel generator.

[0009] The first external signal input terminal is connected to a signal output terminal of a power demand response device outside the device.

[0010] Furthermore, the device also includes a synchronization unit, a signal input end of the synchronization unit is connected to the incoming line end of the first switch, a control signal end of the synchronization unit is connected to the diesel generator controller, and a signal output end of the synchronization unit is connected to the first internal signal input end of the master controller;

[0011] A synchronization unit is used to detect the voltage and frequency signals of the input terminal of the first switch and the output power supply of the diesel generator set in real time, output a second control signal to the diesel generator set controller to adjust the voltage and frequency signals of the output power supply of the diesel generator set to synchronize with the AC power supply, and transmit the synchronization completion signal from its signal output terminal to the first internal signal input terminal of the main controller; and when an island signal is detected, it is transmitted from its signal output terminal to the first internal signal input terminal of the main controller, so that the main controller can output an eighth control signal from the first internal control signal terminal to the control signal terminal of the first switch to open the switch; or when a diesel generator set fault signal is detected, it is transmitted from its signal output terminal to the first internal signal input terminal of the main controller, so that the main controller can output a ninth control signal from the second internal control signal terminal to the control signal terminal of the second switch to open the switch.

[0012] Furthermore, the device also includes a current transformer and a power quality management unit. The current transformer and the power quality management unit are arranged on the incoming line end of the first switch. The internal signal input end of the power quality management unit is connected to the signal output end of the current transformer. The external signal input end of the power quality management unit is connected to the signal output end of the current transformer at the power quality monitoring point outside the device. The signal control end of the power quality management unit is connected to the third internal control signal end of the master controller.

[0013] The power quality management unit is used to receive the current data collected by the current transformer in real time, analyze the power quality at the required monitoring point, and output the analysis result to the third internal control signal terminal of the main controller through the signal control terminal, so that the main controller can judge whether the power quality meets the grid-connected requirements. If it does not meet the set power quality requirements, the third control signal is output from the third internal control signal terminal to the power quality management unit for power quality management until the grid-connected requirements are met.

[0014] Furthermore, the first switch and the second switch both have isolation function, overcurrent protection, undervoltage trip protection, obvious disconnection point and electric operating mechanism;

[0015] The first switch is used to receive the control signal of the first internal control signal terminal of the main controller to perform closing and opening actions to connect and disconnect the device with the mains power supply.

[0016] The second switch is used to receive the control signal of the second internal control signal terminal of the main controller to perform closing and opening actions to connect and disconnect the device with the power supply of the diesel generator set.

[0017] Furthermore, the second external signal input terminal of the main controller is connected to the signal output terminal of the reverse power detection device outside the device, and is used to monitor in real time whether there is reverse power at the reverse power monitoring point. When a reverse power signal is received, the first internal control signal terminal of the main controller outputs a fourth control signal to control the opening of the first switch. At this time, the diesel generator set switches to off-grid island operation.

[0018] Furthermore, the third external signal input terminal of the master controller is a reserved port

[0019] The second external signal output terminal of the master controller is a reserved port.

[0020] Furthermore, an extension interface is reserved on the dedicated busbar for extending to the extended section to connect to the load outgoing line circuit.

[0021] In a second aspect, the present invention further provides a diesel generator power connection control method based on power demand response, the control method comprising:

[0022] Step 1, receiving a power demand response signal in real time through the main controller. When there is no power demand response signal, the main controller does not output a control signal. At this time, the first switch is in a closed state and the second switch is in an open state. When the power demand response signal is received, the main controller outputs a first control signal to the diesel generator set controller to start the diesel generator set.

[0023] Step 2, detecting the voltage and frequency signals of the input terminal of the first switch and the output power supply of the diesel generator set in real time through the synchronization unit, and outputting a second control signal to the diesel generator set controller to adjust the voltage and frequency signals of the output power supply of the diesel generator set to be synchronized with the mains power supply;

[0024] Step 3, outputting a fifth control signal through the main controller to control the second switch to close;

[0025] Step 4: The power quality parameters at the required monitoring points are monitored in real time by the power quality management unit, and transmitted to the main controller for analysis and judgment. The main controller then outputs a third control signal to control the power quality management unit to perform power quality management to ensure that the power quality meets the grid connection requirements;

[0026] Step 5: After receiving the demand response end signal, the main controller outputs a sixth control signal to control the second switch to open, and outputs a seventh control signal to the diesel generator set controller to shut it down.

[0027] Furthermore, the control method further includes between step 4 and step 5:

[0028] When the grid-connected system of the diesel generator set is provided with reverse power protection, the main controller outputs a fourth control signal to control the first switch to open after receiving the reverse power signal.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] 1. By setting up a master controller C, receiving the power demand response signal, starting the diesel generator sets and making them run simultaneously, peak shaving is achieved during the peak period of the power grid.

[0031] 2. By setting up the synchronization unit SU, the voltage and frequency signals of the AC power supply and the output power supply of the diesel generator set are monitored and collected in real time to complete the synchronization of the diesel generator set power supply and the AC power supply.

[0032] 3. By setting up the power quality management unit PQU, the power quality of the diesel generator set after being connected to the grid can be detected and managed in real time to meet the grid connection requirements.

[0033] 4. By setting the main controller C, after the diesel generator set is connected to the grid, reverse power protection can be achieved for systems that do not allow reverse power.

[0034] 5. By setting the synchronization unit SU, the island signal or the diesel generator set fault signal is monitored in real time. When the mains power supply or the diesel generator set fails, the first switch or the second switch is controlled to operate reliably to disconnect the device from the faulty power supply.

[0035] 6. The second switch is controlled by the fire alarm signal sent by the fire protection system. When the fire alarm signal is received, the second switch is controlled to trip, disconnect the diesel generator set from the device, and the diesel generator set is switched to the fire protection power supply mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0037] Figure 1 It is a schematic structural diagram of a power supply connection device for a diesel generator set based on power demand response according to the present invention.

[0038] Reference numerals and corresponding component names:

[0039] 1-first internal control signal terminal, 2-second internal control signal terminal, 3-first internal signal input terminal, 4-third internal control signal terminal, 5-second internal signal input terminal, 6-first external signal input terminal, 7-second external signal input terminal, 8-third external signal input terminal, 9-first external signal output terminal, 10-second external signal output terminal. DETAILED DESCRIPTION

[0040] Hereinafter, the term "include" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. In addition, as used in various embodiments of the present invention, the terms "include", "have" and their cognates are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0041] In various embodiments of the present invention, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the words listed at the same time. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0042] The expressions (such as "first", "second", etc.) used in various embodiments of the present invention may modify the various constituent elements in various embodiments, but may not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing an element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of various embodiments of the present invention, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0043] It should be noted that if it is described that one component element is “connected” to another component element, the first component element may be directly connected to the second component element, and a third component element may be “connected” between the first component element and the second component element. Conversely, when one component element is “directly connected” to another component element, it can be understood that there is no third component element between the first component element and the second component element.

[0044] The terms used in various embodiments of the present invention are only used for the purpose of describing specific embodiments and are not intended to limit various embodiments of the present invention. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise limited, all terms used here (including technical terms and scientific terms) have the same meaning as the meaning generally understood by those of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as the terms defined in the dictionary generally used) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in various embodiments of the present invention.

[0045] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0046] The present invention uses idle diesel generator sets in civil buildings as distributed power sources that participate in the market-oriented response to electricity demand. By establishing a diesel generator power connection device and method based on electricity demand response, the power load of power users on the power grid is reduced, and the peak-shaving demand of the power grid is met. It is an effective, safe and reliable method for achieving power grid peak shaving. This method uses a large number of idle standby diesel generator sets in civil buildings as distributed power sources, and operates them in a planned manner according to the needs of the power grid, which can effectively improve the resilience of urban power grid supply and demand. At the same time, for existing buildings, by making limited modifications to existing diesel generator sets, they can also become distributed power sources that can be connected to the grid and participate in the response to electricity demand.

[0047] The application scenario of the present invention is: for buildings or parks equipped with self-contained diesel generator sets, a diesel generator set power connection device based on power demand response is set up. When a demand response signal is received, the device controls the start-up and grid-connected / island operation of the diesel generator set to achieve power demand response according to a predetermined plan.

[0048] The device receives the power demand response signal in real time through the first external signal input terminal of the main controller, and has the following three operating modes: Mode 1, when there is no power demand response signal, the main controller does not output the control signal, at this time the first switch is in the closed state, the second switch is in the open state, and the dedicated bus in the device is powered by the AC power supply; Mode 2, when the present invention receives the power demand response signal, the device controls the diesel generator set to start, and controls the diesel generator set and the AC power grid-connected operation through the synchronization unit, at this time the first switch and the second switch are both in the closed state; Mode 3, for systems that do not allow reverse power, when a reverse power signal is received, the main controller outputs a control signal to control the first switch to open, and at this time the diesel generator set switches to island operation.

[0049] Example 1

[0050] like Figure 1 As shown, the self-contained diesel generator power connection device based on power demand response of the present invention comprises: a first switch, a second switch, a dedicated bus, a metering unit MU, a synchronization unit SU, a current transformer BC, a power quality management unit PQU and a master controller C; the first switch is a mains power switch QA1, and the second switch is a diesel generator power switch QA2;

[0051] The incoming end of the second switch QA2 is connected to the power output end of the diesel generator set outside the device, the outgoing end of the second switch QA2 is connected to the dedicated bus, the outgoing end of the first switch QA1 is connected to the dedicated bus, the incoming end of the first switch QA1 is connected to the AC power supply outside the device, and the incoming end of the first switch is provided with a power quality management unit PQU; an extension interface is reserved on the dedicated bus, which can be extended to the extended section to connect to the load outgoing line circuit.

[0052] A metering unit MU is provided at the output terminal of the second switch, and a signal output terminal of the metering unit MU is connected to a second internal signal input terminal 5 of the master controller C.

[0053] A current transformer BC is provided at the inlet end of the first switch, a signal output end of the current transformer BC is connected to an internal signal input end P2 of the power quality management unit PQU, an external signal input end P1 of the power quality management unit PQU is connected to a current transformer signal output end of a required monitoring point outside the device, and a signal control end P3 of the power quality management unit PQU is connected to a third internal control signal end 4 of the master controller C;

[0054] The signal input terminal S1 of the synchronization unit SU is connected to the incoming line terminal of the first switch QA1, the control signal terminal S2 of the synchronization unit SU is connected to the diesel generator controller outside the device, and the signal output terminal S3 of the synchronization unit SU is connected to the first internal signal input terminal 3 of the master controller C;

[0055] The first internal control signal terminal 1 of the main controller C is connected to the control signal terminal of the first switch QA1, the second internal control signal terminal 2 of the main controller C is connected to the control signal terminal of the second switch QA2, the first external signal input terminal 6 of the main controller C is connected to the signal output terminal of the power demand response device outside the device, the second external signal input terminal 7 of the main controller C is connected to the signal output terminal of the reverse power detection device outside the device, the third external signal input terminal 8 of the main controller C is a reserved port, the first external signal output terminal 9 of the main controller C is connected to the signal input terminal of the diesel generator set controller outside the device, and the second external signal output terminal 10 of the main controller C is a reserved port.

[0056] The first external signal input terminal 6 of the master controller C receives the power demand response signal in real time. When there is no power demand response signal, the master controller C does not output the control signal. At this time, the first switch QA1 is in the closed state, and the second switch QA2 is in the open state. When the power demand response signal is received, the master controller C outputs the first control signal to the diesel generator controller through the first external signal output terminal 9 to start the diesel generator.

[0057] The first switch QA1 and the second switch QA2 have isolation functions, overcurrent protection, undervoltage tripping protection, obvious disconnection points and electric operating mechanisms; the first switch QA1 can receive the control signal of the first internal control signal terminal 1 of the main controller C to perform closing and opening actions to connect and disconnect the AC power supply; the second switch QA2 can receive the control signal of the second internal control signal terminal 2 of the main controller C to perform closing and opening actions to connect and disconnect the diesel generator set power supply.

[0058] The power quality management unit PQU is used to receive the current data collected in real time by the current transformer BC or the current transformer at the required monitoring point outside the device, analyze the power quality, and output the analysis result to the third internal control signal terminal 4 of the main controller C through the signal control terminal P3. The main controller C determines whether the power quality meets the grid-connected requirements. If it does not meet the set power quality requirements, it outputs a third control signal from the third internal control signal terminal to the power quality management unit for power quality management until the grid-connected requirements are met.

[0059] The synchronization unit SU receives the voltage and frequency signals of the input terminal of the first switch QA1 and the output power supply of the diesel generator set through the signal input terminal S1 and the control signal terminal S2, respectively, outputs a second control signal from the control signal terminal S2 to the diesel generator set controller to adjust the voltage and frequency signals of the output power supply of the diesel generator set to be synchronized with the mains power supply, and transmits the synchronization completion signal from its signal output terminal S3 to the first internal signal input terminal 3 of the master controller C;

[0060] The synchronization unit SU can monitor the working conditions of the AC power supply and the diesel generator set power supply in real time through the signal input terminal S1 and the control signal terminal S2. When an islanding signal or a diesel generator set fault signal is detected, it will be transmitted from its signal output terminal S3 to the first internal signal input terminal 3 of the master controller C; after receiving the islanding detection signal, the master controller C outputs the eighth control signal from the first internal control signal terminal 1 to the control signal terminal of the first switch QA1 to open the switch; after receiving the diesel generator set fault signal, the master controller C outputs the ninth control signal from the second internal control signal terminal 2 to the control signal terminal of the second switch QA2 to open the switch.

[0061] The second external signal input terminal 7 of the main controller C is connected to the signal output terminal of the reverse power detection device outside the device, and monitors in real time whether there is reverse power at the reverse power monitoring point. When a reverse power signal is received, a fourth control signal is output to control the opening of the first switch QA1. At this time, the diesel generator set switches to off-grid island operation.

[0062] The present invention has the following advantages:

[0063] (1) By setting up a master controller C, receiving the power demand response signal, starting the diesel generator set and connecting it to the grid, peak shaving is achieved during the peak period of the power grid.

[0064] (2) By setting up the synchronization unit SU, the voltage and frequency signals of the AC power supply and the output power supply of the diesel generator set are monitored and collected in real time, so as to complete the synchronization of the diesel generator set power supply and the AC power supply.

[0065] (3) By setting up a power quality management unit PQU, the power quality at the required monitoring points can be detected and managed in real time to meet the grid connection requirements.

[0066] (4) By setting up the master controller C, after the diesel generator set is connected to the grid, reverse power protection can be achieved for the system not connected to the grid.

[0067] (5) By setting up a synchronization unit SU, the island signal or the diesel generator set fault signal is monitored in real time. When the mains power supply or the diesel generator set fails, the first switch QA1 or the second switch QA2 is controlled to operate reliably to disconnect the faulty power supply.

[0068] (6) The second switch QA2 is controlled by the fire alarm signal sent by the fire protection system. When the fire alarm signal is received, the second switch QA2 is controlled to trip, disconnecting the diesel generator set from the public power grid, and realizing the island operation of the diesel generator set.

[0069] Example 2

[0070] The difference between this embodiment and embodiment 1 is that this embodiment provides a control method for a power connection device of a self-contained diesel generator set based on power demand response, and the control method includes:

[0071] Step A, installing the power demand response-based diesel generator set power connection device of Example 1;

[0072] Step B, receiving the power demand response signal in real time through the first external signal input terminal 6 of the master controller C. When there is no power demand response signal, the master controller C does not output the control signal. At this time, the first switch QA1 is in the closed state, and the second switch QA2 is in the open state; when the power demand response signal is received, the master controller C outputs the first control signal to the diesel generator set controller through the first external signal output terminal 9 to start the diesel generator set; the voltage and frequency signals of the input terminal of the first switch QA1 and the output power supply of the diesel generator set are detected in real time through the synchronization unit SU, and the second control signal is output to the diesel generator set controller to adjust the voltage and frequency signals of the output power supply of the diesel generator set to be synchronized with the mains power supply;

[0073] Step C, outputting a fifth control signal through the main controller C to control the second switch QA2 to close;

[0074] Step D, monitoring the power quality parameters at the required monitoring points in real time through the power quality management unit PQU, and transmitting them to the main controller C for analysis and judgment, and the main controller C then outputs a third control signal to control the power quality management unit PQU to perform power quality management to ensure that the power quality meets the grid connection requirements;

[0075] Step E, the master controller C is provided with a reverse power protection function (which can be turned off); when the diesel generator set is connected to the grid and is provided with reverse power protection, the master controller C receives a reverse power signal and outputs a fourth control signal to control the first switch QA1 to open;

[0076] Step F, after receiving the demand response end signal, the main controller C outputs a sixth control signal to control the second switch QA2 to open, and outputs a seventh control signal to the diesel generator set controller to shut it down.

[0077] The present invention mainly solves the abnormal problem of tight power supply in the power grid under extreme weather conditions, makes full use of idle self-contained diesel generator sets in civil buildings, participates in the market-oriented response on the power demand side, meets the peak-time peak-time demand of the power grid, and improves the supply and demand resilience of the urban power grid.

[0078] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0079] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0080] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0081] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0082] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A diesel generator power connection device based on power demand response, characterized in that: The device comprises a first switch, a second switch, a dedicated bus, a metering unit and a master controller; the first switch is a mains power switch, and the second switch is a diesel generator power switch; the inlet end of the second switch is connected to the power output end of the diesel generator outside the device, the outlet end of the second switch is connected to the dedicated bus, the outlet end of the first switch is connected to the dedicated bus, and the inlet end of the first switch is connected to the mains power supply outside the device; the outlet end of the second switch is provided with a metering unit; The control signal end of the first switch is connected to the first internal control signal end of the master controller, the control signal end of the second switch is connected to the second internal control signal end of the master controller, and the signal output end of the metering unit is connected to the second internal signal input end of the master controller; The device receives a power demand response signal in real time through the first external signal input terminal of the master controller. When there is no power demand response signal, the master controller does not output a control signal. At this time, the first switch is in a closed state and the second switch is in an open state. When a power demand response signal is received, the master controller outputs a first control signal to the diesel generator controller through the first external signal output terminal to start the diesel generator. The first external signal input terminal is connected to a signal output terminal of a power demand response device outside the device.

2. The diesel generator power supply connection device based on power demand response according to claim 1 is characterized in that: The device also includes a synchronization unit, wherein a signal input end of the synchronization unit is connected to an incoming line end of the first switch, a control signal end of the synchronization unit is connected to a diesel generator controller, and a signal output end of the synchronization unit is connected to a first internal signal input end of the master controller; The synchronization unit is used to detect the voltage and frequency signals of the input terminal of the first switch and the output power supply of the diesel generator set in real time, output a second control signal to the diesel generator set controller to adjust the voltage and frequency signals of the output power supply of the diesel generator set to synchronize with the mains power supply, and transmit the synchronization completion signal from its signal output terminal to the first internal signal input terminal of the main controller; and when an island signal is detected, it is transmitted from its signal output terminal to the first internal signal input terminal of the main controller, so that the main controller can output the eighth control signal from the first internal control signal terminal to the control signal terminal of the first switch to open the switch; or when a diesel generator set fault signal is detected, it is transmitted from its signal output terminal to the first internal signal input terminal of the main controller, so that the main controller can output the ninth control signal from the second internal control signal terminal to the control signal terminal of the second switch to open the switch.

3. The diesel generator power connection device based on power demand response according to claim 1, characterized in that: The device also includes a current transformer and a power quality management unit. The current transformer and the power quality management unit are provided on the incoming line end of the first switch. The internal signal input end of the power quality management unit is connected to the signal output end of the current transformer; the external signal input end of the power quality management unit is connected to the signal output end of the current transformer at the power quality monitoring point outside the device, and the signal control end of the power quality management unit is connected to the third internal control signal end of the master controller; The power quality management unit is used to receive current data collected by the current transformer in real time, analyze the power quality at the required monitoring point, and output the analysis result to the third internal control signal terminal of the main controller through the signal control terminal, so that the main controller can judge whether the power quality meets the grid-connected requirements. If it does not meet the set power quality requirements, a third control signal is output from the third internal control signal terminal to the power quality management unit for power quality management until the grid-connected requirements are met.

4. The diesel generator power connection device based on power demand response according to claim 1, characterized in that: The first switch and the second switch both have isolation function, overcurrent protection, undervoltage tripping protection, obvious disconnection points and electric operating mechanisms; The first switch is used to receive the control signal of the first internal control signal terminal of the master controller to perform closing and opening actions to connect and disconnect the device with the main power supply; The second switch is used to receive the control signal of the second internal control signal terminal of the main controller to perform closing and opening actions to connect and disconnect the device with the power supply of the diesel generator set.

5. The diesel generator power connection device based on power demand response according to claim 1, characterized in that: The second external signal input terminal of the master controller is connected to the signal output terminal of the reverse power detection device outside the device, and is used to monitor in real time whether there is reverse power at the reverse power monitoring point. When a reverse power signal is received, the first internal control signal terminal of the master controller outputs a fourth control signal to control the opening of the first switch. At this time, the diesel generator set switches to off-grid island operation.

6. The diesel generator power supply connection device based on power demand response according to claim 5, characterized in that: The third external signal input terminal of the master controller is a reserved port; The second external signal output terminal of the master controller is a reserved port.

7. The diesel generator power supply connection device based on power demand response according to claim 1, characterized in that: An extension interface is reserved on the dedicated bus, and the extension interface is used to extend to the extension section to connect to the load outgoing line circuit.

8. The control method of a diesel generator power connection device based on power demand response according to any one of claims 1 to 7, characterized in that: The control method includes: Step 1, receiving a power demand response signal in real time through the main controller. When there is no power demand response signal, the main controller does not output a control signal. At this time, the first switch is in a closed state and the second switch is in an open state. When the power demand response signal is received, the main controller outputs a first control signal to the diesel generator set controller to start the diesel generator set. Step 2, detecting the voltage and frequency signals of the input terminal of the first switch and the output power supply of the diesel generator set in real time through the synchronization unit, and outputting a second control signal to the diesel generator set controller to adjust the voltage and frequency signals of the output power supply of the diesel generator set to be synchronized with the mains power supply; Step 3, outputting a fifth control signal through the main controller to control the second switch to close; Step 4: The power quality parameters at the required monitoring points are monitored in real time by the power quality management unit, and transmitted to the main controller for analysis and judgment. The main controller then outputs a third control signal to control the power quality management unit to perform power quality management to ensure that the power quality meets the grid connection requirements; Step 5: After receiving the demand response end signal, the main controller outputs a sixth control signal to control the second switch to open, and outputs a seventh control signal to the diesel generator set controller to shut it down.

9. The control method according to claim 8, characterized in that: The control method further includes between step 4 and step 5: When the diesel generator set is connected to the grid and reverse power protection is provided, the main controller outputs a fourth control signal to control the first switch to open after receiving the reverse power signal.

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