Over-voltage suppression device for generator unit

Abstract

The invention belongs to generators, and particularly discloses an over-voltage suppression device for a generator unit, which is used for a small internal-combustion generator unit, wherein an alternating-current generator driven by an internal-combustion engine is connected with a plurality of loads. The over-voltage suppression device is characterized in that the alternating-current generator is connected with a voltage sensor, the voltage sensor is connected with a microcontroller through a signal processing unit, and the microcontroller is connected with a standby resistance load via an electronic switch. According to the invention, the voltage sensor is used for detecting the output voltage amplitude and the frequency of the generator in real time, in the case that the microcontroller judges that the load has a large-amplitude sharp reduction according to the fluctuation data of the output voltage amplitude and the frequency of the generator unit, the standby resistance load is instantaneously used via the electronic switch, and the microcontroller is used for supplementing a consecutive power reduction transition area according to the response characteristic of the mechanical governor of the internal-combustion engine, so as to stabilize the fluctuations of the output voltage amplitude and the frequency of the generator. The over-voltage suppression device disclosed by the invention is reasonable in structure, high in energy efficiency, and reliable in performance.

Description

technical field [0001] The invention belongs to generators, in particular to an overvoltage suppressing device for generator sets. Background technique [0002] Small internal combustion engine generator sets are widely used in various occasions where the public power grid cannot be reached and as an emergency backup power supply when the public power grid fails. Due to the small total installed capacity of the small internal combustion engine generator set, in the case of supplying power to several loads at the same time, when a load with a large power suddenly cuts off the power supply, due to the imbalance between the instantaneous output power of the internal combustion engine and the electric rate of the generator, and the mechanical speed regulation of the internal combustion engine The limitation of the response speed of the generator will cause short-term overspeed or runaway of the internal combustion engine, and cause overvoltage at the output of the generator, whi...

AI Technical Summary

Problems solved by technology

Due to the small total installed capacity of the small internal combustion engine generator set, in the case of supplying power to several loads at the same time, when a load with a large power suddenly cuts off the power supply, due to the imbalance between the instantaneous output power of the internal combustion engine and the electric rate of the generator, and the mechanical speed regulation of the internal combustion engine The limitation of the response speed of the generator will cause short-term overspeed or runaway of the internal combustion engine, and cause overvoltage at the output of the generator, which will endanger the safety of power consumption of other loads.

At present, only variable frequency output generators are relatively effective in suppressing the overvoltage caused by sudden load changes, but their reliability is relatively poor, and the price is also very expensive, and the problem of overspeeding of internal combustion engines has not been effectively solved.

Images