Intelligent start-stop and load protection device and method for diesel generating set

Abstract

The invention relates to the technical field of generator sets, in particular to an intelligent start-stop and load protection device and method for a diesel generator set, and the method comprises the steps: reading the real-time power and current parameters of an online diesel generator set controller; the load percentage is calculated, and when the load percentage rises to a threshold value, power limitation is triggered; when the power is limited, a starting instruction is sent to the preparation unit, and the diesel generating set automatically accesses the internet; and when the load rate of the online diesel generating set is low, a shutdown instruction is sent, and the set is automatically unloaded, disconnected and shut down. According to the invention, intelligent start-stop and load protection of the generator set are realized, the working efficiency is improved, and the labor intensity of personnel is reduced.

Description

Technical Field

[0001] This invention relates to the field of generator set technology, and is a device and method for intelligent start-stop and load protection of diesel generator sets. Background Technology

[0002] During oil drilling operations, when diesel generator sets are used as the power source, the traditional 1200KW high-power diesel generator sets have high operation and maintenance costs. Currently, multiple 450KW low-power diesel generator sets are being used in the western drilling market. Typically, 3-5 high-power diesel generator sets are configured, while 14-20 low-power diesel generator sets are typically configured.

[0003] The following problems exist when multiple small-power diesel generator sets are operated in parallel: (1) The control system of the small-power generator set is independent of the main machine control system, and the operator cannot grasp the operating status of the generator set. (2) Due to the rapid application of the winch speed setting, the current and power of the generator set often increase rapidly. Overload operation of the diesel generator set may lead to disconnection from the grid. (3) The remaining power of the diesel generator set is insufficient. When the operator starts the high-power equipment of the mud pump, the load of the diesel generator set often increases. Overload of the diesel generator set leads to disconnection from the grid, causing power outage in the entire well site, which seriously affects the normal progress of drilling operations and may even cause serious downhole accidents. (4) When the load rate is low, multiple small-power diesel generator sets are online at the same time, which causes energy waste. If the start-up and shutdown operations are performed manually, the work efficiency is low. (5) There are many types of drilling rig control systems, and there is no multi-functional universal power limiter suitable for all types of systems.

[0004] Therefore, there is an urgent need for an intelligent start-stop and load protection device and method for diesel generator sets to solve the above problems. Summary of the Invention

[0005] This invention provides an intelligent start-stop and load protection device and method for diesel generator sets, which overcomes the shortcomings of the prior art and can effectively solve the problem of power outage caused by diesel generator set overload leading to disconnection from the grid and power supply interruption throughout the well site.

[0006] One of the technical solutions of this invention is achieved through the following measures: an intelligent start-stop and load protection device for a diesel generator set, comprising: The reading module is used to read the real-time power and current parameters of the online diesel generator set controller; The calculation module is used to calculate the load percentage, and when the load percentage rises to a threshold, it triggers power limiting. The start-up module is used to send start-up commands to the standby generator set when power is limited, and the diesel generator set automatically connects to the Internet. The shutdown module is used to send a shutdown command when the online diesel generator set has a low load rate, and the unit will automatically unload and shut down.

[0007] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions: The aforementioned reading module can be a PLC, which reads real-time power and current parameters. It can also be networked based on ModbusTCP, Ethernet, or CAN bus protocols to enable real-time communication between the PLC and the diesel generator set controller, thus achieving rapid load control.

[0008] It may also include an AC frequency converter system, which can be used to adjust the frequency converter parameter configuration through custom programming of the frequency converter to achieve load speed limitation.

[0009] It may also include a DC analog system, which is used to standardize and convert the collected current into a digital-to-analog converter, and convert the current ratio into a DC voltage to be applied to the intelligent start-stop and load protection device of the diesel generator set to achieve speed limiting.

[0010] The second technical solution of the present invention is achieved through the following measures: a method for intelligent start-stop and load protection of a diesel generator set, comprising: reading real-time power and current parameters of the online diesel generator set controller; calculating the load percentage, and triggering power limiting when the load percentage rises to a threshold; sending a start command to the standby generator set when power limiting occurs, and the diesel generator set automatically connects to the network; and sending a shutdown command when the online diesel generator set load rate is low, and the generator set automatically unloads and disconnects from the grid.

[0011] The following are further optimizations and / or improvements to the second technical solution of the above invention: It can use fieldbus communication technology to communicate with the diesel generator set controller in real time and read the real-time data of the controller's power, voltage, and current.

[0012] It can utilize logic programmable technology to realize drilling mode switching, heavy load query, generator set data processing, generator set load rate related parameter calculation, power limit condition judgment, and intelligent start-stop logic of generator set.

[0013] This invention utilizes fieldbus communication technology to achieve real-time load monitoring and remote transmission of drilling rig data, establishing a connection between the generator set control system and the main control system. It employs automated control technology to implement load power limiting functions for winches, mud pumps, and other components. This invention overcomes the technical challenges of sequential control of generator sets, enabling automatic start-up and shutdown of the generator set, improving drilling efficiency and reducing fuel consumption. Furthermore, this invention achieves intelligent start-up and shutdown of the generator set and load protection, improving work efficiency and reducing the labor intensity of personnel. Attached Figure Description

[0014] Appendix Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0015] Appendix Figure 2 This is a schematic diagram of the positional arrangement according to an embodiment of the present invention.

[0016] Appendix Figure 3 This is a schematic diagram of the control flow according to an embodiment of the present invention. Detailed Implementation

[0017] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0018] The present invention will be further described below with reference to embodiments: Example 1: As shown in the attached document Figure 1 , 2 As shown, the intelligent start-stop and load protection device for this diesel generator set includes: The reading module is used to read the real-time power and current parameters of the online diesel generator set controller. In specific applications, the reading module can be a PLC. The real-time power and current parameters are read through the PLC. A domestic PLC programmable controller can be used, and the PLC and the diesel generator set controller can be networked based on Modbus TCP, Ethernet or CAN bus protocol to realize real-time communication between the PLC and the diesel generator set controller and complete the rapid control of the load.

[0019] The calculation module is used to calculate the load percentage, and when the load percentage rises to a threshold, it triggers power limiting. The start-up module is used to send start-up commands to the standby generator set when power is limited, and the diesel generator set automatically connects to the Internet. The shutdown module is used to send a shutdown command when the online diesel generator set has a low load rate, and the unit will automatically unload and shut down.

[0020] In this embodiment, the real-time load of the drilling rig is monitored to keep it within the generator set's load capacity. Simultaneously, the output of the winch and mud pump needs to be limited. When the generator set reaches its load limit, the existing power output of the transmission unit is maintained. The generator set also quickly restarts itself when the transmission unit's output limit takes effect. The number of generator sets connected to the grid is determined based on the actual load, and the generators automatically connect to or disconnect from the grid. This invention can be used for commissioning and field industrial testing of both AC and DC drilling rigs.

[0021] This embodiment utilizes fieldbus communication technology to achieve real-time load monitoring and remote transmission of the drilling rig, establishing a connection between the generator set control system and the main control system. It employs automated control technology to implement load power limiting functions for components such as the winch and mud pump. It overcomes the technical challenges of sequential generator set control, achieving automatic start-stop functionality, improving drilling efficiency, and reducing fuel consumption. It also realizes intelligent start-stop and load protection for the generator set, improving work efficiency and reducing the labor intensity of personnel.

[0022] Example 2: As shown in the attached document Figure 1 , 2 As shown, the intelligent start-stop and load protection device for this diesel generator set may also include an AC frequency converter system, used for custom programming of the frequency converter to adjust the frequency converter parameter configuration and achieve load speed limiting. Speed ​​limiting schemes using Siemens, ABB, Vowant, Inovance, or other frequency converters, or Roshal digital DC speed controllers, can be used. The intelligent start-stop and load protection device may also include a DC analog system, used to standardize and convert the collected current into a digital-to-analog converter, converting the current ratio into a DC voltage applied to the intelligent start-stop and load protection device to achieve speed limiting.

[0023] Example 3: As shown in the attached document Figure 3 As shown, this embodiment provides a method for intelligent start-stop and load protection of diesel generator sets, including: reading real-time power and current parameters of the online diesel generator set controller; calculating the load percentage, and triggering power limiting when the load percentage rises to a threshold; sending a start command to the standby generator set when power limiting occurs, and the diesel generator set automatically connects to the network; and sending a shutdown command when the online diesel generator set load rate is low, and the generator set automatically unloads and disconnects from the grid.

[0024] In this embodiment, fieldbus communication technology is used to communicate with the diesel generator set controller in real time and read the real-time data of the controller's power, voltage, and current.

[0025] In this embodiment, logic programmable technology is used to realize drilling operation mode switching, heavy load query, generator set data processing, generator set load rate related parameter calculation, power limit condition judgment, and generator set intelligent start-stop logic.

[0026] This embodiment utilizes fieldbus communication technology to achieve real-time load monitoring and remote transmission of the drilling rig, establishing a connection between the generator set control system and the main control system. It employs automated control technology to implement load power limiting functions for components such as the winch and mud pump. It overcomes the technical challenges of sequential generator set control, achieving automatic start-stop functionality, improving drilling efficiency, and reducing fuel consumption. It also realizes intelligent start-stop and load protection for the generator set, improving work efficiency and reducing the labor intensity of personnel.

[0027] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A diesel generator set intelligent start-stop and load protection device, characterized in that Comprising: a reading module for reading real-time power and current parameters of an online diesel generator set controller; a calculation module for calculating a load percentage, triggering power limitation when the load percentage rises to a threshold value; a starting module for sending a starting instruction to a standby generator set when power limitation occurs, and the diesel generator set automatically goes online; a shutdown module for sending a shutdown instruction when the load rate of the online diesel generator set is low, and the unit automatically unloads and is shut down.

2. The intelligent start-stop and load protection device for diesel generating set according to claim 1, characterized in that The reading module is a PLC, which reads real-time power and current parameters through the PLC, and realizes real-time communication between the PLC and the diesel generator set controller based on ModbusTCP, Ethernet or Can bus protocol networking, and completes fast load control.

3. The intelligent start-stop and load protection device for diesel generating set according to claim 1 or 2, characterized in that It also includes an AC variable frequency system for adjusting variable frequency converter parameter configuration through variable frequency converter self-defined programming to realize load speed limitation.

4. The intelligent start-stop and load protection device for diesel generating set according to claim 1 or 2, characterized in that It also includes a DC analog system for normalizing and digital-to-analog converting the collected current, converting the current proportion into a DC voltage applied to the diesel generator set intelligent start-stop and load protection device to realize speed limitation.

5. The intelligent start-stop and load protection device for diesel generator set of claim 3, wherein It also includes a DC analog system for normalizing and digital-to-analog converting the collected current, converting the current proportion into a DC voltage applied to the diesel generator set intelligent start-stop and load protection device to realize speed limitation.

6. A method for intelligent start-stop and load protection of a diesel generator set, characterized in that Comprising: reading real-time power and current parameters of an online diesel generator set controller; calculating a load percentage, triggering power limitation when the load percentage rises to a threshold value; sending a starting instruction to a standby generator set when power limitation occurs, and the diesel generator set automatically goes online; sending a shutdown instruction when the load rate of the online diesel generator set is low, and the unit automatically unloads and is shut down.

7. The diesel generator set intelligent start-stop and load protection method according to claim 6, characterized in that Real-time communication with the diesel generator set controller is realized by using field bus communication technology to read real-time data of the controller power, voltage and current.

8. The diesel generator set intelligent start-stop and load protection method according to claim 6 or 7, characterized in that Using logic programmable technology, drilling working condition mode switching, heavy load inquiry, generator set data processing, generator set load rate related parameter calculation, power limitation condition judgment and generator set intelligent start-stop logic are realized.

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