System and method for an integrated control system for a diesel generating set

A method for controlling a diesel generating set including a diesel engine, a generator, an exciter having an exciter field voltage, a speed governor having a generator speed reference, and an automatic voltage regulator having a generator reference voltage, the method comprising steps of:

• measuring a terminal voltage of the generator of the diesel generating set;
• measuring a speed of the generator of the diesel generating set;
• filtering the terminal voltage of the generator by a first low-pass filter having a first time constant;
• filtering the speed of the generator by a second low-pass filter having a second time constant;
• determining, by the automatic voltage regulator, a voltage feedback control output voltage based on the filtered terminal voltage of the generator by the filtered rotational speed of the generator;
• controlling the exciter field voltage, by the voltage regulator, by modifying the generator reference voltage by the voltage feedback control output voltage;
• measuring a real power output of the generator;
• determining a rate of change of the generator real power output by filtering the measured generator real power output by a washout filter having a washout time constant;
• determining the phase lag of the rate of change of the generator real power output by filtering the rate of change of the generator real power output by a lead-lag filter having a phase lead time constant and a phase lag time constant;
• determining, by the automatic voltage regulator, a speed feedback control signal by amplifying the phase lag of the rate of change of the generator real power output by a predetermined gain;
• transmitting, by the automatic voltage regulator, through the first communications interface, the speed feedback control output to the speed governor;
• receiving, by the speed governor, the speed feedback control output from the automatic voltage regulator;
• adjusting, by the speed governor, the speed of the diesel engine by modifying the generator speed reference based on the speed feedback control output;
• and
• minimizing, by the automatic voltage regulator, variations of the generator output voltage magnitude and frequency response from nominal by determining the speed feedback control output in conjunction with the voltage feedback control output.

A system for controlling a diesel generating set including a diesel engine, a generator having a terminal voltage and a generator output voltage magnitude and frequency response, an exciter having an exciter field voltage, a speed governor having a generator speed reference and a first communications interface, and an automatic voltage regulator having a generator reference voltage and a second communications interface, the system comprising:

• a computer data processor apparatus operatively coupled to a non-transitory computer memory containing computer executable instructions, that when executed by one or more processors, cause the one or more processors to:
• determine, by the automatic voltage regulator, a voltage feedback control output voltage based on the terminal voltage of the generator by a speed of the generator;
• control the exciter field voltage, by the automatic voltage regulator, by modifying the generator reference voltage by the voltage feedback control output voltage;
• measure, by the automatic voltage regulator, a real power output of the generator;
• determine, by the automatic voltage regulator, a rate of change of the generator real power output;
• determine, by the automatic voltage regulator, a speed feedback control output based on rate of change of the generator real power output;
• transmit, by the automatic voltage regulator, through the first communications interface, the speed feedback control output to the speed governor;
• receive, by the speed governor, the speed feedback control output from the automatic voltage regulator;
• adjust, by the speed governor, the speed of the diesel engine by modifying the generator speed reference based on the speed feedback control output;
• and
• minimize, by the automatic voltage regulator, variations of the generator output voltage magnitude and frequency response from nominal by determining the speed feedback control output in conjunction with the voltage feedback control output.

A system for controlling a diesel generating set including a diesel engine, a generator, an exciter having an exciter field voltage, a speed governor having a generator speed reference, and an automatic voltage regulator having a generator reference voltage, the system comprising:

• a computer data processor apparatus operatively coupled to a non-transitory computer memory containing computer executable instructions, that when executed by one or more processors, cause the one or more processors to:
• measure a terminal voltage of the generator of the diesel generating set;
• measure a speed of the generator of the diesel generating set;
• filter the terminal voltage of the generator by a first low-pass filter having a first time constant;
• filter the speed of the generator by a second low-pass filter having a second time constant;
• determine, by the automatic voltage regulator, a voltage feedback control output voltage based on the filtered terminal voltage of the generator by the filtered rotational speed of the generator;
• control the exciter field voltage, by the voltage regulator, by modifying the generator reference voltage by the voltage feedback control output voltage;
• measure a real power output of the generator;
• determine a rate of change of the generator real power output by filtering the measured generator real power output by a washout filter having a washout time constant;
• determine the phase lag of the rate of change of the generator real power output by filtering the rate of change of the generator real power output by a lead-lag filter having a phase lead time constant and a phase lag time constant;
• determine, by the automatic voltage regulator, a speed feedback control signal by amplifying the phase lag of the rate of change of the generator real power output by a predetermined gain;
• transmit, by the automatic voltage regulator, through the first communications interface, the speed feedback control output to the speed governor;
• receive, by the speed governor, the speed feedback control output from the automatic voltage regulator;
• adjust, by the speed governor, the speed of the diesel engine by modifying the generator speed reference based on the speed feedback control output;
• and
• minimize, by the automatic voltage regulator, variations of the generator output voltage magnitude and frequency response from nominal by determining the speed feedback control output in conjunction with the voltage feedback control output.