소수의 전자소자를 사용한 간이형 AVR의 시작에 관한 연구

The study on tentative-production of AVR using simple electronic devices

To maintain terminal voltage of a generator at constant value automatic voltage regulator(AVR) is used by adjusting field current of a generator. In almost all industrial field, self-exciting type generator is usually adopted. So in this paper, the field of our discussion lies on shunt type AVR mainly adopted in self-exciting type generator which shunt field current to regulate terminal voltage. As shunt device here, transistor or thyristor is used, and also PID control algorithm is applied in this type of AVR. Even in minute voltage variation it can work satisfactorily both in voltage recovery and its quick response, because of sophisticated control circuit. But, in this paper we set up a very simple AVR composed of a small number of electronic devices based on transistor shunt circuit and detection circuit of voltage deviation to realize the need for low cost and easiness of AVR handling. Shunt device is installed par all to field current circuit to regulate exciting current by by-passing the current and deviation voltage detection circuit detects the voltage deviation between ouput and reference voltage of generator to control shunt circuit current. Although proposed AVR circuit in this paper is not so effective as PID control circuit type AVR, set up AVR circuit can be composed with a remarkably small number of electronic devices. With this study, followings are pointed out. 1. It is confirmed that test set-up AVR can be used in industrial field. 2. Very low cost AVR can be made up using Tr., OP Amp. and voltage regulator. 3. It can be said that simplicity and easiness are realized in maintenance and handling with this AVR for trial set up and power consumption was considerably reduced.