Remote control system for diesel generator to participate in power grid auxiliary service

Abstract

The invention provides a remote control system for a diesel generator to participate in a power grid auxiliary service, and the system comprises an intelligent control device which controls the mode of the diesel generator, collects power generation data, and uploads the collected power generation data to a remote control platform; the remote control platform receives the power grid electricity demand sent by the power auxiliary service platform, controls the plurality of diesel generators to generate electricity through the plurality of intelligent control devices according to the power grid electricity demand, and transmits the electricity to the power grid; the emergency diesel generator can be applied to power auxiliary services such as demand side response and peak regulation of a power grid by participating in power grid auxiliary services; the remote control platform can integrate all remotely connected diesel generating sets together to participate in power grid auxiliary service through intelligent control over the diesel generating sets of users in a load aggregator mode and share relevant benefits with the users, and meanwhile the users can save basic electric charge through the remote control platform.

Description

Technical Field

[0001] The present invention relates to the field of Internet of Things and electrical measurement and control technology, and in particular to a remote control system for a diesel generator to participate in power grid auxiliary services. Background Art

[0002] As annual domestic power generation and consumption gradually balance, and electricity consumption growth flattens, the power grid no longer has the resources for large-scale investments in transmission and distribution. There is an urgent need to improve asset operating efficiency within the existing transmission and distribution network. Therefore, power ancillary services such as demand-side response and frequency and peak shaving have become important solutions to this problem. Currently, demand-side response and frequency and peak shaving primarily focus on industrial users and power plants, with minimal participation from a large number of residential and commercial users. According to statistics, residential and commercial users account for over 30% of total electricity consumption. Integrating these users into power ancillary services such as demand-side response and peak shaving is a future option.

[0003] According to research, a large number of diesel generator sets are currently used as emergency power sources on the market. These generator sets, while excellent power generation resources, remain idle for most of the time, generally only being used as emergency power sources during grid outages. This waste of resources is a major concern for technical personnel, as they are often used only as emergency power sources during grid outages. Therefore, how to fully utilize these emergency diesel generators for power-assisted services such as demand-side response and peak shaving has become a major concern for technical personnel. Summary of the Invention

[0004] The existing technology has a problem of how to make full use of these emergency diesel generators to apply them to meet the power auxiliary services such as demand-side response and peak regulation of the power grid.

[0005] To solve the above technical problems, according to some embodiments, the present application provides a remote control system for diesel generators participating in grid auxiliary services, comprising: multiple diesel generators, multiple intelligent control devices, and a remote control platform;

[0006] Each diesel generator is equipped with a controller and connected to the grid through a corresponding intelligent control device;

[0007] Each intelligent control device is connected to the controller of a diesel generator through communication and IO, which is used to control the diesel generator in multiple modes and collect power generation data in real time, and upload the collected power generation data to the remote control platform;

[0008] A plurality of intelligent control devices are electrically connected to the remote control platform;

[0009] The remote control platform is also connected to the external power auxiliary service platform through the Internet to receive the power grid power demand issued by the power auxiliary service platform, and control multiple diesel generators through multiple intelligent control devices to generate electricity and transmit it to the power grid according to the power grid power demand, so as to participate in the power grid auxiliary service.

[0010] Furthermore, the intelligent control device includes an embedded processor and data storage unit, a display screen and buttons, wired and / or wireless communication circuits, and a remote communication interface;

[0011] The remote control platform communicates with the intelligent control device using wired and / or wireless communication circuits;

[0012] Mode control includes starting and stopping the diesel generator and power regulation;

[0013] Power generation data includes oil quantity, oil pressure, temperature, actual power generation, output voltage, and current;

[0014] The display screen and buttons are connected to the IO port of the embedded processor for human-computer interaction; the buttons are used for input heat exchange adjustment of the intelligent control device, and the display screen is used to display power generation data;

[0015] The data storage unit is controlled by an embedded processor and is used to save power data and parameters.

[0016] Furthermore, the intelligent control device also includes a metering chip;

[0017] The metering chip receives the voltage and current signals from the diesel generator output and calculates the power and power generation of each diesel generator in real time;

[0018] The metering chip is connected to the SPI bus of the embedded processor, and the embedded processor reads the power data through the SPI bus.

[0019] Furthermore, a hardware encryption chip unit is provided inside the intelligent control device, which integrates a variety of symmetric and asymmetric algorithms and complies with national confidentiality requirements and specifications;

[0020] The communication data between the embedded processor inside the intelligent control device and the diesel generator, and the reception and transmission of communication data with the remote control platform are all encrypted through the encryption chip unit.

[0021] Furthermore, a grid-connected synchronization unit is integrated inside the intelligent control device, and the grid-connected synchronization unit includes a grid-connected switch and a grid-connected synchronization device;

[0022] The grid-connected switch is composed of a bidirectional conductive electronic switch;

[0023] The grid-connected synchronization device monitors the frequency and amplitude of the diesel generator output voltage, the frequency and amplitude of the grid voltage, and the phase difference between the diesel generator output voltage and the grid voltage; when the diesel generator needs to be connected to the grid, it adjusts the speed of the diesel generator to the synchronous speed in real time and adjusts the generator excitation unit to make the generator output voltage amplitude and the grid voltage converge; when the frequency and amplitude of the output voltage of a diesel generator and the grid voltage reach the same, if the phase difference is less than a first preset value, it sends a closing command to the grid-connected switch, and the grid-connected switch is turned on;

[0024] The remote control platform sends a power generation control command to the intelligent control device. After receiving the power generation control command, the intelligent control device adjusts the power generation in real time by adjusting the speed of the diesel generator.

[0025] Furthermore, the metering chip measures the response power value ψ during the diesel generator grid-connected power generation period. i , the calculation formula of the response power value is as follows:

[0026] ψ i =∫P i (k)*T i (k), i≥1;

[0027] Where i represents the i-th diesel generator in the diesel generator load pool participating in the grid auxiliary service; k represents the current time, T i (k) represents the continuous power generation time of the response, P i (k) represents the generated power.

[0028] Furthermore, the intelligent control device is also connected to the smart meter of the grid metering point of the user of the diesel generator and receives meter data information from the smart meter, the meter data information including the historical power generation record of the diesel generator for the user;

[0029] Obtain the historical power generation records of each diesel generator supplying electricity to users and generate a historical load curve;

[0030] Predict the power generation capacity of each diesel generator based on the historical load curve and rated power ψ i (k) and the corresponding continuous power generation time T i (k);

[0031] According to the number n of diesel generators that can be connected to the grid, the total load ψ(k), and the power generation capacity that each diesel generator can respond to ψ i (k) and the continuous power generation time T that each diesel generator can respond to i(k) Develop an optimal strategy for grid-connected power generation of diesel generators: the number n of diesel generators that are allocated for load control is the smallest, and the sum of the continuous power generation time that can respond is the longest. The specific formula is as follows:

[0032] Where n=min(∑i) takes the minimum value,

[0033] Furthermore, the diesel generator responds to the start / stop and power control commands issued by the remote control platform as an intelligent control device, and records the actual power at the start of the response as the response measurement value, the actual continuous power generation response time, and uploads the actual response load power measured internally in real time;

[0034] The remote control platform obtains revenue based on the actual load response electricity consumption. The revenue is not limited to the revenue from participating in demand response and peak load regulation. The user's diesel generator shares the relevant revenue based on the actual response load electricity and the agreement with the platform.

[0035] Furthermore, the meter data information also includes the user's historical electricity usage information on the grid;

[0036] Determine the power demand value for the next period at the current moment based on historical power consumption information;

[0037] If the demand value exceeds the preset limit, the remote control platform issues a grid connection instruction to request the diesel generator corresponding to the smart meter to connect to the grid for power generation;

[0038] After the intelligent control device receives the grid connection instruction and successfully connects the diesel generator to the grid at the same time, the intelligent control device adjusts the output power of the diesel generator according to the power demand value and the preset limit value to control the power generation of the diesel generator.

[0039] The above technical solution of the present invention has at least the following beneficial technical effects:

[0040] (1) In this application, each intelligent control device is used to control the multiple modes of the diesel generator and collect power generation data in real time, and upload the collected power generation data to the remote control platform; the remote control platform receives the power demand of the power grid issued by the power auxiliary service platform from the outside, and controls multiple diesel generators through multiple intelligent control devices according to the power demand of the power grid to generate electricity and transmit it to the power grid to participate in the power grid auxiliary service, so that the emergency diesel generator can be used in power auxiliary services such as demand-side response and peak regulation of the power grid.

[0041] (2) Intelligent control devices are used to control the power of diesel generators and collect electricity consumption data of user nodes, and the collected data information is uploaded to the remote control platform. The remote control platform can integrate all remotely connected diesel generators together to participate in grid auxiliary services in the form of load aggregators through intelligent control of user diesel generator sets, and share related benefits with users. At the same time, users can also save on basic electricity costs through the remote control platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the traditional technology, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 This is a schematic diagram of the structure of a remote control system for a diesel generator participating in grid auxiliary services in one embodiment of the present application.

[0044] Figure 2 It is a structural diagram of an intelligent control device in one embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, each embodiment of the present application will be described in detail below with reference to the accompanying drawings. However, it will be understood by those skilled in the art that in each embodiment of the present application, many technical details are proposed to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can be implemented. The division of the following embodiments is for convenience of description and should not constitute any limitation on the specific implementation of the present application. The various embodiments can be combined with each other and referenced to each other under the premise of no contradiction.

[0046] like Figure 1 As shown, an embodiment of the present application provides a remote control system for diesel generators to participate in grid auxiliary services, including: multiple diesel generators, multiple intelligent control devices and a remote control platform;

[0047] Each diesel generator is equipped with a controller and connected to the grid through a corresponding intelligent control device;

[0048] Usually, one diesel generator is equipped with one intelligent control device. Each intelligent control device is connected to the controller of one diesel generator through communication and IO, which is used to control the diesel generator in multiple modes and collect power generation data in real time, and upload the collected power generation data to the remote control platform.

[0049] A plurality of intelligent control devices are electrically connected to the remote control platform;

[0050] The remote control platform is also connected to an external power auxiliary service platform via the Internet to receive power grid electricity demand issued by the power auxiliary service platform, where the external power auxiliary service platform can be various dispatching platforms of the power grid or the government; and according to the power grid electricity demand, multiple diesel generators are controlled through multiple intelligent control devices to generate electricity and transmit it to the power grid to participate in power grid auxiliary services.

[0051] The remote control platform includes an IoT data server and a WEB platform. The IoT data server is mainly used for data storage and cloud computing. The remote control platform is connected to the power auxiliary service platform through the Internet, accepts demand-side response and peak-shaving response instructions issued by the power auxiliary service platform, and participates in related transactions.

[0052] To improve system efficiency, the remote control platform can also adopt a decentralized approach, establishing a collaborative blockchain directly within the intelligent control device. The intelligent control device can directly serve as a node in the collaborative blockchain, with the blockchain's consensus algorithm implemented through a smart contract mechanism. The power auxiliary service platform acts as the publisher of the smart contract mechanism. Nodes can directly connect to each other, and a data encryption and anti-tampering mechanism can be established directly within the blockchain, eliminating the need for an encryption chip.

[0053] In one embodiment of the present application, Figure 2 As shown, the intelligent control device includes an embedded processor and a data storage unit, a display screen and buttons, a wired and / or wireless communication circuit, and a remote communication interface.

[0054] The remote control platform is connected to the intelligent control device using wired and / or wireless communication circuits, so that the intelligent control device can use wireless communication (such as WiFi, infrared, Bluetooth) and / or wired communication (such as RS485, PLC power carrier communication, etc.) to control the diesel generator to start and stop and adjust the power generation.

[0055] Mode control includes the start and stop of the diesel generator and power regulation; power generation data includes oil quantity, oil pressure, temperature, actual power generation, output voltage and current.

[0056] The display screen and buttons are connected to the IO port of the embedded processor for human-computer interaction; the buttons are used for input heat exchange adjustment of the intelligent control device, and the display screen is used to display power generation data;

[0057] The data storage unit is controlled by an embedded processor and is used to save power data and parameters.

[0058] Preferably, the intelligent control device further comprises a metering chip;

[0059] The metering chip receives the voltage and current signals from the diesel generator output and calculates the power and power generation of each diesel generator in real time;

[0060] The metering chip is connected to the SPI bus of the embedded processor, and the embedded processor reads the power data through the SPI bus.

[0061] Preferably, a hardware encryption chip unit is provided inside the intelligent control device. The encryption hardware chip unit integrates a variety of symmetric and asymmetric algorithms and complies with national confidentiality requirements and specifications. The encryption hardware chip unit belongs to hardware encryption and has an extremely high security level. It can ensure that the keys and information data stored inside will not be illegally read.

[0062] The communication data between the embedded processor inside the intelligent control device and the diesel generator, and the reception and transmission of communication data with the remote control platform are all encrypted through the encryption chip unit to ensure the security of the communication data.

[0063] Preferably, in order to realize automatic grid connection of diesel generators and reduce grid-connected impact current, a grid-connected synchronization unit is integrated inside the intelligent control device, and the grid-connected synchronization unit includes a grid-connected switch and a grid-connected synchronization device; the grid-connected switch is composed of a bidirectional conductive electronic switch; the grid-connected synchronization device monitors the frequency and amplitude of the diesel generator output voltage, the frequency and amplitude of the grid voltage, and the phase difference between the diesel generator output voltage and the grid voltage; when the diesel generator needs to be grid-connected, the speed of the diesel generator is adjusted to the synchronous speed in real time, and the generator excitation unit is adjusted to make the generator output voltage amplitude and the grid voltage converge; when the frequency and amplitude of the output voltage of a certain diesel generator are the same as the frequency and amplitude of the grid voltage, the phase difference is judged: if the phase difference is less than a first preset value, a closing instruction is issued to the grid-connected switch, and the grid-connected switch is turned on, that is, the closing is successful; the remote control platform sends a power generation control command to the intelligent control device, and after receiving the power generation control command, the intelligent control device adjusts the speed of the diesel generator to achieve real-time adjustment of the power generation.

[0064] In one embodiment of the present application, the metering chip measures the response power value ψ during the diesel generator grid-connected power generation period. i , the calculation formula of the response power value is as follows:

[0065] ψ i =∫P i (k)*T i (k), i≥1; formula (1)

[0066] Where i represents the i-th diesel generator in the diesel generator load pool participating in the grid auxiliary service; k represents the current time, T i(k) represents the continuous power generation time of the response, P i (k) represents the generated power.

[0067] In one embodiment of the present application, the remote control platform is connected to the intelligent control device, integrating all remotely connected diesel generator sets together, and participating in power auxiliary services including demand-side response and peak regulation (mainly peak shaving) of the power grid through intelligent control of the diesel generator sets in the form of a load aggregator; since some of all diesel generators are performing emergency power generation and are directly excluded from the control strategy, the remaining currently idle diesel generators need to consider historical emergency power generation conditions, some of which are periodic, so it is necessary to refer to historical emergency power generation cycles to formulate grid-connected participation in power auxiliary services. The overall control strategy and process are as follows:

[0068] The intelligent control device also includes a metering point information collection unit, which is connected to the smart meter at the grid metering point of the diesel generator user and receives meter data from the smart meter, including the historical power generation records of the diesel generator for the user. The remote control platform determines the total load ψ(k) to be regulated for demand-side response based on the remote control platform's current forecast of the total regulated load and the intelligent transaction response strategy executed by the remote control platform. It also determines which diesel generator will participate in the grid ancillary service and the service time based on the status of the existing diesel generators, as follows:

[0069] Obtain the historical power generation records of each diesel generator supplying electricity to users and generate a historical load curve;

[0070] Predict the power generation capacity of each diesel generator based on the historical load curve and rated power ψ i (k) and the corresponding continuous power generation time T i (k); wherein, the prediction method is: determine the continuous power generation time that can be responded to based on the historical emergency power generation cycle, for example: if the diesel generator is generating electricity, the continuous power generation time that can be responded to is 0; if the diesel generator is generating electricity for users periodically and is not generating electricity, the continuous power generation time that can be responded to is the time from the current moment to the next time it generates electricity for users within the expected cycle.

[0071] According to the number n of diesel generators that can be connected to the grid, the total load ψ(k), and the power generation capacity that each diesel generator can respond to ψ i (k) and the continuous power generation time T that each diesel generator can respond to i (k) Develop an optimal strategy for grid-connected power generation of diesel generators: minimize the number n of diesel generators that can control the load while maximizing the total continuous power generation time that can be responded to, as shown in the following formula:

[0072]

[0073] Furthermore, the diesel generator responds to the start / stop and power control commands issued by the remote control platform in the form of an intelligent control device, and records the actual power at the start of the response as the response meter value and the time of continuous power generation response. The actual response load power of the internal meter is uploaded in real time and calculated according to formula (1). The remote control platform obtains revenue based on the actual load response power consumption, which is not limited to the revenue from participating in demand response and peak regulation. The user's diesel generator shares the relevant revenue based on the actual response load power and the agreement with the platform.

[0074] In one embodiment of the present application, in addition to participating in grid auxiliary services, the intelligent control device can also implement demand control for users to save demand electricity charges. Its demand control strategy is as follows:

[0075] The meter data also includes the user's historical grid electricity consumption information; the electricity demand value for the next period at the current moment is determined based on the historical electricity consumption information; if the demand value exceeds the preset limit, the remote control platform issues a grid connection instruction requiring the diesel generator corresponding to the smart meter to be connected to the grid for power generation.

[0076] After the intelligent control device receives the grid connection command and successfully synchronizes the diesel generator to the grid, it adjusts the generator's output power based on the power demand value and the preset limit value, controlling the generator's power generation. This strictly controls the user's grid metering point power demand below the limit value, reducing demand peaks and saving the user's basic electricity bill.

[0077] It should be understood that the above-mentioned specific embodiments of the present application are merely illustrative or explain the principles of the present application and do not constitute a limitation of the present application. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present application should be included in the scope of protection of the present application. In addition, the claims attached hereto are intended to cover all variations and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A remote control system for diesel generators participating in grid auxiliary services, characterized in that: include: Multiple diesel generators, multiple intelligent control devices and remote control platforms; Each diesel generator is equipped with a controller and connected to the grid through a corresponding intelligent control device; Each intelligent control device is connected to the controller of a diesel generator through communication and IO, which is used to control the diesel generator in multiple modes and collect power generation data in real time, and upload the collected power generation data to the remote control platform; A plurality of intelligent control devices are electrically connected to the remote control platform; The remote control platform is also connected to the external power auxiliary service platform through the Internet to receive the power grid power demand issued by the power auxiliary service platform, and control multiple diesel generators through multiple intelligent control devices to generate electricity and transmit it to the power grid according to the power grid power demand, so as to participate in the power grid auxiliary service.

2. The remote control system for diesel generators participating in grid auxiliary services according to claim 1, characterized in that: The intelligent control device includes an embedded processor and data storage unit, a display screen and buttons, wired and / or wireless communication circuits, and a remote communication interface; The remote control platform communicates with the intelligent control device using wired and / or wireless communication circuits; Mode control includes starting and stopping the diesel generator and power regulation; Power generation data includes oil quantity, oil pressure, temperature, actual power generation, output voltage, and current; The display screen and buttons are connected to the IO port of the embedded processor for human-computer interaction; the buttons are used for input heat exchange adjustment of the intelligent control device, and the display screen is used to display power generation data; The data storage unit is controlled by an embedded processor and is used to save power data and parameters.

3. The remote control system for diesel generators participating in grid auxiliary services according to claim 1, characterized in that: The intelligent control device also includes a metering chip; The metering chip receives the voltage and current signals from the diesel generator output and calculates the power and power generation of each diesel generator in real time; The metering chip is connected to the SPI bus of the embedded processor, and the embedded processor reads the power data through the SPI bus.

4. The remote control system for diesel generators participating in grid auxiliary services according to claim 1, characterized in that: The intelligent control device is equipped with a hardware encryption chip unit, which integrates a variety of symmetric and asymmetric algorithms and complies with national confidentiality requirements and regulations; The communication data between the embedded processor inside the intelligent control device and the diesel generator, and the reception and transmission of communication data with the remote control platform are all encrypted through the encryption chip unit.

5. The remote control system for diesel generators participating in grid auxiliary services according to claim 1, characterized in that: The intelligent control device is internally integrated with a grid-connected synchronization unit, which includes a grid-connected switch and a grid-connected synchronization device; The grid-connected switch is composed of a bidirectional conductive electronic switch; The grid-connected synchronization device monitors the frequency and amplitude of the diesel generator output voltage, the frequency and amplitude of the grid voltage, and the phase difference between the diesel generator output voltage and the grid voltage. When the diesel generator needs to be connected to the grid, the speed of the diesel generator is adjusted in real time to the synchronous speed, and the generator excitation unit is adjusted to make the generator output voltage amplitude and the grid voltage converge. When the frequency and amplitude of the output voltage of a diesel generator and the grid voltage reach the same, if the phase difference is less than a first preset value, a closing command is issued to the grid-connected switch, and the grid-connected switch is turned on. The remote control platform sends a power generation control command to the intelligent control device. After receiving the power generation control command, the intelligent control device adjusts the power generation in real time by adjusting the speed of the diesel generator.

6. The remote control system for diesel generators participating in grid auxiliary services according to claim 1, characterized in that: The metering chip measures the response power value ψ during the diesel generator grid-connected power generation period i , the calculation formula of the response power value is as follows: ψ i =∫P i (k)*T i (k),i≥1; Where i represents the i-th diesel generator in the diesel generator load pool participating in the grid auxiliary service; k represents the current time, T i (k) represents the continuous power generation time of the response, P i (k) represents the generated power.

7. The remote control system for diesel generators participating in grid auxiliary services according to claim 1, characterized in that: The intelligent control device is also connected to the smart meter of the power grid metering point of the user of the diesel generator and receives meter data information from the smart meter, the meter data information including the historical power generation record of the diesel generator for the user; Obtain the historical power generation records of each diesel generator supplying electricity to users and generate a historical load curve; Predict the power generation capacity of each diesel generator based on the historical load curve and rated power ψ i (k) and the corresponding continuous power generation time T i (k); According to the number n of diesel generators that can be connected to the grid, the total load ψ(k), and the power generation capacity that each diesel generator can respond to ψ i (k) and the continuous power generation time T that each diesel generator can respond to i (k) Develop an optimal strategy for grid-connected power generation of diesel generators: the number n of diesel generators that are allocated for load control is the smallest, and the sum of the continuous power generation time that can respond is the longest. The specific formula is as follows: Where n=min(∑i) takes the minimum value, 8. The remote control system for diesel generators participating in grid auxiliary services according to claim 7, characterized in that: The diesel generator responds to the start-stop and power control instructions issued by the remote control platform in the form of intelligent control devices, and records the actual power when the response starts as the response meter value and the actual continuous power generation response time, and uploads the actual response load power measured internally in real time; the remote control platform obtains revenue based on the actual load response power consumption, and the revenue is not limited to the revenue from participating in demand response and peak regulation revenue. The user's diesel generator shares the relevant revenue based on the actual response load power and the agreement with the platform.

9. The remote control system for diesel generators participating in grid auxiliary services according to claim 1, characterized in that: The meter data information also includes the user's historical electricity consumption information from the grid; Determine the power demand value for the next period at the current moment based on historical power consumption information; If the demand value exceeds the preset limit, the remote control platform issues a grid connection instruction to request the diesel generator corresponding to the smart meter to connect to the grid for power generation; After the intelligent control device receives the grid connection instruction and successfully connects the diesel generator to the grid at the same time, the intelligent control device adjusts the output power of the diesel generator according to the power demand value and the preset limit value to control the power generation of the diesel generator.

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