Control system for parallel operation redundancy of diesel generating set

Abstract

The invention discloses a control system for parallel operation redundancy of a diesel generating set, belongs to the technical field of generating set control, and solves the technical problem that parallel operation of a set group and power distribution of the set group can be influenced when a CAN bus has a fault. The system comprises a plurality of generator sets and a master controller, each generator set comprises a diesel engine and a set controller, each diesel engine is provided with a diesel engine ECU, a diesel engine speed increasing switch, a fine adjustment rotating speed increasing switch and a fine adjustment rotating speed reducing switch, and each diesel engine ECU is in communication connection with the corresponding set controller through a 1 # CAN line. The diesel engine ECU is electrically connected with the diesel engine speed increasing switch, the fine-tuning rotating speed increasing switch and the fine-tuning rotating speed reducing switch, and the master controller is sequentially in communication connection with the unit controller through a second CAN line. The automatic parallel operation function and the manual parallel operation function form redundancy, and manual parallel operation can be carried out under the condition that automatic parallel operation fails.

Description

Technical Field

[0001] This invention relates to the field of generator set control technology, and more specifically, to a control system for parallel redundancy of diesel generator sets. Background Technology

[0002] Currently, in industries such as data centers, the parallel control of electronically controlled diesel engine groups mainly relies on the unit controller to automatically parallel and distribute power via the CAN bus. However, there is no redundancy. As long as there is a fault in the CAN bus, it will affect the normal communication of the unit group, thereby affecting the parallel operation and power distribution of the unit group.

[0003] In response to the existing technical problems and difficulties, there is an urgent need for a method that can realize the parallel operation of a group of generating units and the power distribution of the group of generating units. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a control system for parallel redundancy of diesel generator sets, which can effectively ensure that the generator sets can be normally paralleled and power distributed when the CAN bus parallel method fails.

[0005] The technical solution of this invention is: a control system for parallel redundancy of diesel generator sets, comprising several generator sets and a main controller. Each generator set includes a diesel engine and a generator set controller. The diesel engine is equipped with a diesel engine ECU, a diesel engine speed-up switch, a fine-tuning speed-increasing switch, and a fine-tuning speed-decreasing switch. The diesel engine ECU is communicatively connected to the generator set controller via CAN line #1. The diesel engine ECU is electrically connected to the diesel engine speed-up switch, the fine-tuning speed-increasing switch, and the fine-tuning speed-decreasing switch. The main controller is communicatively connected to the generator set controller sequentially via CAN line #2.

[0006] The generator set controller obtains the speed of the diesel engine through the diesel engine ECU and uploads it to the main controller;

[0007] The main controller compares the speeds of each diesel engine. When the speed of a diesel engine is inconsistent with the speeds of the other diesel engines, the main controller sends a synchronization command to the generator controller of that diesel engine. The generator controller of that diesel engine then sends the synchronization command to the diesel engine ECU of that diesel engine. The diesel engine ECU controls the diesel engine to match the speed of the other diesel engines according to the synchronization command to achieve automatic parallel operation.

[0008] When a communication failure occurs on either CAN line 1 or CAN line 2 of a generator unit controller, the generator unit controller will issue an automatic paralleling fault alarm. At this time, manual paralleling can be achieved by manually operating the speed increase or decrease switch to make the speed of the diesel engine match the speed of the other diesel engines.

[0009] As a further improvement, the main controller acquires the power of the external load and sends a power distribution command to each of the generator unit controllers based on the power of the external load. Each generator unit controller communicates with the diesel engine ECU according to the power distribution command to adjust the speed of the diesel engine, realize the automatic parallel operation function, and achieve uniform power distribution through speed adjustment.

[0010] Furthermore, the diesel engine ECU is equipped with a speed droop module, which has a speed droop MAP table that corresponds to different diesel engine speeds for different power outputs. After manual paralleling, the diesel engine ECU automatically distributes power according to the speed droop MAP table.

[0011] Furthermore, during manual paralleling, after starting the new generator set, first operate the diesel engine speed-up switch to quickly increase the diesel engine to its rated speed, and then operate the fine-tuning speed-increasing switch or the fine-tuning speed-decreasing switch to make the speed of the newly started diesel engine consistent with the speed of the other diesel engines, thus achieving manual paralleling.

[0012] Furthermore, the diesel engine speed-up switch, the fine-tuning speed-increasing switch, and the fine-tuning speed-decreasing switch are all self-resetting switches.

[0013] Furthermore, it also includes a main control panel, in which the diesel engine speed-up switch, fine-tuning speed-increasing switch, and fine-tuning speed-decreasing switch of each generator set are centrally installed, and the speed of each diesel engine is centrally displayed on the main control panel.

[0014] Furthermore, the generator set controller, diesel engine ECU, and main controller all use a heartbeat mechanism to determine whether a communication failure has occurred.

[0015] Beneficial effects

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] This invention enables automatic parallel operation by sending a synchronization command through the main controller when communication on CAN lines 1 and CAN lines 2 of all group controllers is normal. Simultaneously, the unit controller achieves uniform power distribution through speed adjustment. If automatic parallel operation fails, manual parallel operation can be achieved by fine-tuning the speed increase or decrease switch to match the diesel engine's speed with other diesel engines. The automatic and manual parallel operation functions are redundant, allowing for manual parallel operation in case of automatic failure. After manual parallel operation, automatic power distribution is achieved through a speed droop module. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the main control panel in this invention.

[0020] Among them: 1-generator set, 2-main controller, 3-diesel engine, 4-generator set controller, 5-diesel engine ECU, 6-diesel engine speed increase switch, 7-fine adjustment speed increase switch, 8-fine adjustment speed decrease switch, 9-1#CAN line, 10-2#CAN line, 11-main control panel, 12-digit display. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0022] See Figures 1-2 A control system for parallel redundancy of diesel generator sets includes several generator sets 1 and a main controller 2. The generator set 1 includes a diesel engine 3 and a generator set controller 4. The diesel engine 3 is equipped with a diesel engine ECU 5, a diesel engine speed increase switch 6, a fine-tuning speed increase switch 7, and a fine-tuning speed decrease switch 8. The diesel engine ECU 5 is connected to the generator set controller 4 via CAN line 1# 9 and is electrically connected to the diesel engine speed increase switch 6, the fine-tuning speed increase switch 7, and the fine-tuning speed decrease switch 8. The main controller 2 is connected to the generator set controller 4 via CAN line 2# 10.

[0023] The generator unit controller 4 obtains the speed of the diesel engine 3 through the diesel engine ECU5 and uploads it to the main controller 2.

[0024] The main controller 2 compares the speeds of each diesel engine 3. When the speed of a certain diesel engine 3 is inconsistent with the speeds of the other diesel engines 3, the main controller 2 sends a synchronization command to the generator controller 4 of that diesel engine 3. The synchronization command includes the speeds of the other diesel engines 3, i.e., the target speeds to be synchronized. The generator controller 4 of that diesel engine 3 then sends the synchronization command to the diesel engine ECU 5 of that diesel engine 3. The diesel engine ECU 5 controls the speed of that diesel engine 3 to be consistent with the speeds of the other diesel engines 3 according to the synchronization command, thereby achieving automatic parallel operation.

[0025] When a communication failure occurs on CAN line 9 (1#) or CAN line 10 (2#) of a generator unit controller 4, the generator unit controller 4 issues an automatic parallel operation fault alarm, such as through an audible and visual alarm or an alarm displayed on the screen. At this time, manual parallel operation is achieved by manually operating the speed increase switch 7 or the speed decrease switch 8 to match the speed of the diesel engine 3 with that of the other diesel engines 3. Each operation of the speed increase switch 7 or the speed decrease switch 8 increases or decreases the speed of the diesel engine 3 by a fixed value or percentage, such as by 20 revolutions per minute or 1% of the rated speed.

[0026] When communication on CAN lines 1 and CAN lines 2 of all group controllers is normal, automatic parallel operation can be achieved by sending a synchronization command through the main controller. Simultaneously, the unit controller ensures uniform power distribution through speed adjustment. If automatic parallel operation fails, manual parallel operation can be achieved by fine-tuning the speed increase or decrease switch to match the diesel engine's speed with other diesel engines. The automatic and manual parallel operation functions are redundant, allowing for manual parallel operation if automatic operation fails.

[0027] The main controller 2 obtains the power of the external load and sends a power distribution command to each unit controller 4 according to the power of the external load. Each unit controller 4 communicates with the diesel engine ECU 5 according to the power distribution command to adjust the speed of the diesel engine 3, realize the automatic parallel operation function, and at the same time achieve the uniformity of power distribution through speed adjustment.

[0028] The diesel engine ECU5 is equipped with a speed droop module, which has a speed droop MAP table that corresponds to different diesel engine speeds for different power outputs. After manual paralleling, the diesel engine ECU5 automatically distributes power according to the speed droop MAP table. That is, the diesel engine ECU5 obtains the target speed by looking up the speed droop MAP table based on the power output, and then obtains the target fuel injection quantity (through the universal characteristic curve or MAP table) based on the power output and the target speed. The engine speed is controlled by controlling the target fuel injection quantity.

[0029] When manually paralleling, after starting the new generator set 1, first operate the diesel engine speed-up switch 6 to quickly increase the diesel engine 3 to the rated speed, and then operate the fine-tuning speed-increasing switch 7 or the fine-tuning speed-decreasing switch 8 to make the speed of the newly started diesel engine 3 consistent with the speed of the other diesel engines 3, thus achieving manual paralleling and reducing the paralleling operation time.

[0030] The diesel engine speed increase switch 6, the fine-tuning speed increase switch 7, and the fine-tuning speed decrease switch 8 are all self-resetting switches.

[0031] The invention also includes a main control panel 11, in which the diesel engine speed-up switch 6, the fine-tuning speed-increasing switch 7, and the fine-tuning speed-decreasing switch 8 of each generator set 1 are centrally installed. The speed of each diesel engine 3 is centrally displayed on the main control panel 11, and the specific speed of each diesel engine 3 is centrally displayed on the main control panel 11 via a digital tube 12. The main control panel 11 allows for convenient centralized manual paralleling of each generator set 1.

[0032] The generator unit controller 4, diesel engine ECU 5, and main controller 2 all use a heartbeat mechanism to determine whether a communication failure has occurred, which can promptly detect communication failures and issue alarms.

[0033] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A control system for parallel redundancy of diesel generator sets, comprising several generator sets (1) and a main controller (2), characterized in that, The generator set (1) includes a diesel engine (3) and a generator set controller (4). The diesel engine (3) is equipped with a diesel engine ECU (5), a diesel engine speed-up switch (6), a fine-tuning speed-increasing switch (7), and a fine-tuning speed-reducing switch (8). The diesel engine ECU (5) is connected to the generator set controller (4) via CAN line 1 (9). The diesel engine ECU (5) is electrically connected to the diesel engine speed-up switch (6), the fine-tuning speed-increasing switch (7), and the fine-tuning speed-reducing switch (8). The main controller (2) is connected to the generator set controller (4) via CAN line 2 (10). The unit controller (4) obtains the speed of the diesel engine (3) through the diesel engine ECU (5) and uploads it to the main controller (2); The main controller (2) compares the speeds of each diesel engine (3). When the speed of a certain diesel engine (3) is inconsistent with the speeds of other diesel engines (3), the main controller (2) sends a synchronization command to the generator controller (4) of that diesel engine (3). The generator controller (4) of that diesel engine (3) then sends the synchronization command to the diesel engine ECU (5) of that diesel engine (3). The diesel engine ECU (5) controls the speed of that diesel engine (3) to be consistent with that of other diesel engines (3) according to the synchronization command to achieve automatic parallel operation. When a communication failure occurs on CAN line 1 (9) or CAN line 2 (10) of a certain unit controller (4), the unit controller (4) issues an automatic paralleling fault alarm. At this time, by manually operating the fine-tuning speed increase switch (7) or fine-tuning speed decrease switch (8), the speed of the diesel engine (3) is made to match the speed of other diesel engines (3) to achieve manual paralleling.

2. The control system for parallel redundancy of a diesel generator set according to claim 1, characterized in that, The main controller (2) obtains the power of the external load and sends a power distribution command to each of the generator set controllers (4) according to the power of the external load. Each generator set controller (4) communicates with the diesel engine ECU (5) according to the power distribution command to adjust the speed of the diesel engine (3) to realize the automatic parallel operation function, and at the same time realize the uniformity of power distribution through speed adjustment.

3. The control system for parallel redundancy of diesel generator sets according to claim 1, characterized in that, The diesel engine ECU (5) is equipped with a speed droop module. The speed droop module is equipped with a speed droop MAP table that corresponds to different diesel engine speeds for different power outputs. After manual paralleling, the diesel engine ECU (5) automatically distributes power according to the speed droop MAP table.

4. The control system for parallel redundancy of a diesel generator set according to claim 1, characterized in that, When manually paralleling, after starting the new generator set (1), first operate the diesel engine speed-up switch (6) to quickly increase the diesel engine (3) to the rated speed, and then operate the fine-tuning speed-increasing switch (7) or fine-tuning speed-decreasing switch (8) to make the speed of the newly started diesel engine (3) consistent with the speed of other diesel engines (3) to achieve manual paralleling.

5. The control system for parallel redundancy of a diesel generator set according to claim 1, characterized in that, The diesel engine speed increase switch (6), the fine-tuning speed increase switch (7), and the fine-tuning speed decrease switch (8) are all self-resetting switches.

6. A control system for parallel redundancy of diesel generator sets according to any one of claims 1-5, characterized in that, It also includes a main control panel (11), where the diesel engine speed-up switch (6), fine-tuning speed-increasing switch (7), and fine-tuning speed-decreasing switch (8) of each generator set (1) are centrally installed on the main control panel (11), and the speed of each diesel engine (3) is centrally displayed on the main control panel (11).

7. The control system for parallel redundancy of a diesel generator set according to claim 1, characterized in that, The generator unit controller (4) communicates with the diesel engine ECU (5) and the main controller (2) through a heartbeat mechanism to determine whether a communication failure has occurred.

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