초록 ▼

Voltage, current and field voltage of a generator connected to an electric power system are sampled at a predetermined period for analog-digital conversion and then led to a digital computer. In addition to computation for AVR, the computer computes from its input the generator output power, and als

Voltage, current and field voltage of a generator connected to an electric power system are sampled at a predetermined period for analog-digital conversion and then led to a digital computer. In addition to computation for AVR, the computer computes from its input the generator output power, and also monitors the occurrence of a fault, the removal of the fault and variation in the generator output in the system. After the occurrence of a fault, the field excitation of the generator is intensified until the generator output power reaches substantially a peak value, but after the peak value is substantially passed by, the excitation is conversely depressed to a value below the level which is present before the fault occurs. When the generator output power recovers the value which is present before the fault occurs, the computer returns to deliver the AVR output.

대표청구항 ▼

A method for controlling the excitation of a generator connected to an electric power system by controlling its field in response to the generator voltage comprising the steps of: increasing, when a fault occurs in the electric power system, the field excitation such that it exceeds a level which is

A method for controlling the excitation of a generator connected to an electric power system by controlling its field in response to the generator voltage comprising the steps of: increasing, when a fault occurs in the electric power system, the field excitation such that it exceeds a level which is present before the fault occurs during a time interval after the fault is removed until the internal phase angle of the generator substantially reaches a peak value; and decreasing the field excitation such that it falls below said level after the interval phase angle has substantially passed through the peak value. Apparatus for controlling the excitation of a generator comprising: first means for detecting, at predetermined periods, voltage, current, and field voltage of the generator connected to an electric power system; second means for converting an output of the first means into a digital output signal; third means for carrying out a predetermined operation processing of the digital output signal of the second means within each of the predetermined periods in accordance with a stored program; fourth means for storing the program; fifth means for storing the digital output signal of the second means and an output of the third means; sixth means for storing data to be used as reference values for examination; and seventh means for controlling the field excitation of the generator by the output of the third means, said third means including means for computing the generator output power from the voltage and current, delivering an output for intensifying the field excitation of the generator to a predetermined value, when a computation result from the present period is decreased below a computation result from an immediately preceding period by more than a predetermined value, and thereafter delivering an output for depressing the field excitation such that it falls below a value which is present immediately before the excitation is intensified to the predetermined value, when a computation result of the generator output power which falls below a computation result from an immediately preceding period is detected.