Excitation shaft-driven power generation control device
The closed-loop control system, which uses PLC real-time sampling and frequency converter feedback, solves the problem of voltage and frequency instability of the excitation shaft generator under high power load, realizes stable voltage output and real-time system monitoring, and reduces maintenance difficulty and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-03-31
AI Technical Summary
Existing excitation shaft generators are unable to meet the excitation current requirements under high-power load scenarios, resulting in unstable output voltage and frequency, especially when the load changes or faults occur, they cannot respond in a timely manner.
A closed-loop control system is adopted, which uses PLC real-time sampling, frequency converter control signal feedback and DC unit precise adjustment. Combined with the display unit and PLC linkage, it realizes real-time monitoring and stable output of the excitation generator.
It achieves stable output voltage of the exciter generator under various loads and operating conditions, reduces maintenance difficulty and operating costs, and improves the safety and reliability of the system.
Smart Images
Figure CN224068565U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ship power generation technology, specifically to an excitation shaft-driven power generation control device. Background Technology
[0002] A shaft-driven generator is a power generation device used in ships. Driven by the ship's main engine, it converts electrical energy into power through shaft and belt transmission, thereby supplying electricity to the ship.
[0003] Existing excitation shaft-driven generators mostly employ AVR (Automatic Voltage Regulator) control, which achieves voltage stability by adjusting the current in the excitation winding. AVRs offer advantages such as fast response, simple structure, and low cost, and have long been widely used in excitation control for small to medium power applications. However, because AVR systems are primarily designed for low to medium power equipment, their excitation winding adjustment range and current capacity are limited, making it difficult to meet the demands of high excitation current under high-power loads. When the system load changes drastically or encounters a sudden fault, the AVR cannot provide sufficient excitation current in time, leading to unstable output voltage and frequency. Utility Model Content
[0004] This invention provides an excitation shaft-driven power generation control device that can overcome some or all of the defects of the prior art.
[0005] According to the present invention, the excitation shaft-driven generator control device includes an excitation shaft-driven generator connected to a host machine. The excitation shaft-driven generator has an excitation DC winding, an output terminal, and a sampling terminal. The output terminal is connected to a frequency converter, and the frequency converter is connected to an output unit. The excitation DC winding is connected to a DC unit, and the DC unit is connected to the frequency converter. The sampling terminal is connected to a low-frequency voltage sampling box, and the low-frequency voltage sampling box is connected to a PLC. The PLC is connected to the frequency converter.
[0006] In a preferred embodiment of this application, the frequency converter includes a PTI unit and a PTO unit connected in sequence, wherein the PTI unit is connected to the output terminal and the PTO unit is connected to the output unit.
[0007] In a preferred embodiment of this application, the frequency converter further includes a main control unit and an AS control unit connected to each other. The main control unit is connected to the PLC, and the AS control unit is connected to the DC unit.
[0008] In a preferred embodiment of this application, the DC unit is connected to the PLC.
[0009] In a preferred embodiment of this application, the PLC is also connected to a display unit.
[0010] Beneficial effects:
[0011] 1. By using PLC real-time sampling, inverter control signal feedback, and DC unit precise adjustment, the excitation generator achieves a stable output voltage, maintaining a constant output voltage under various loads and operating conditions.
[0012] 2. The display unit is linked with the PLC, which not only realizes the real-time display of the operating status, but also makes it easier for operators to conduct on-site monitoring, fault diagnosis and timely maintenance, reducing maintenance difficulty and operation and maintenance costs. Attached Figure Description
[0013] Figure 1 This is a structural block diagram of the excitation shaft-driven power generation control device in at least one embodiment of this application. Detailed Implementation
[0014] This application provides an excitation shaft-driven generator control device, which includes an excitation shaft-driven generator connected to a host machine. The excitation shaft-driven generator is fixedly connected to the host machine and connected by a shaft clamping method.
[0015] The excitation shaft-driven generator is equipped with an excitation DC winding, whose output terminal 1 is connected to the frequency converter, while the sampling terminal 2 acquires the output voltage and frequency signals through a low-frequency voltage sampling box. The frequency converter internally houses a PTI unit and a PTO unit: the PTI unit primarily performs rectification and primary signal processing tasks; the PTO unit uses digital control to achieve precise regulation of the output unit.
[0016] Meanwhile, the inverter integrates a main control unit and an AS control unit. The main control unit is responsible for exchanging data with the PLC, while the latter directly controls the DC current output to ensure the working stability of the excitation DC winding.
[0017] In addition, the low-frequency voltage sampling box transmits the collected voltage and frequency signals to the PLC. The PLC compares the preset standard voltage with the actual sampled voltage and outputs a 4-20mA control signal to the main control unit. At the same time, it connects to the excitation DC winding through the DC unit to form a closed-loop control system.
[0018] When the PLC detects an abnormal output voltage or frequency, it can promptly issue a protection command through the main control unit to activate the AS control unit and quickly adjust the output of the DC unit to protect the system safety.
[0019] The entire control system achieves real-time closed-loop feedback, ensuring the stability and continuity of the excitation generator voltage output.
[0020] Understandably, the DC unit is model VHP800 DC module.
[0021] In some embodiments, the PLC is also connected to a display unit, which is a touch screen display that can display system operating parameters in real time, including sampling voltage, frequency, excitation current, etc., to facilitate on-site monitoring and subsequent data analysis.
[0022] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.
Claims
1. A field shaft generator control device characterized by comprising: The excitation shaft generator connected with the host computer has an excitation DC winding, an output end and a sampling end, the output end is connected with a frequency converter, the frequency converter is connected with an output unit, the excitation DC winding is connected with a DC unit, the DC unit is connected with the frequency converter, the sampling end is connected with a low-frequency voltage sampling box, the low-frequency voltage sampling box is connected with a PLC, and the PLC is connected with the frequency converter.
2. The excited shaft generator control device according to claim 1, characterized by The frequency converter comprises a PTI unit and a PTO unit connected in sequence, the PTI unit is connected with the output end, and the PTO unit is connected with the output unit.
3. The excited shaft generator control device according to claim 2, characterized by The frequency converter further comprises a master control unit and an AS control unit connected with each other, the master control unit is connected with the PLC, and the AS control unit is connected with the DC unit.
4. The excited shaft generator control device according to claim 1, characterized by The DC unit is connected with the PLC.
5. The excited shaft generator control device according to claim 1, characterized by The PLC is further connected with a display unit.