Electric power converter for combined power generation system

An electric power converter for a combined power generation system, the electric power converter being provided at a power supply system constituted by a plurality of electric power generation facilities each including a power storage facility including a power storage device and an electric power converting unit,

• the electric power converter comprising:
• a voltage measuring unit configured to measure a voltage of the power supply system;
• a frequency measuring unit configured to measure a frequency of the power supply system;
• an electric power measuring unit configured to measure active electric power and reactive electric power at an output terminal of the power storage facility;
• and
• a system control device, wherein:
• the system control device includes
• a frequency command value calculating portion including a first proportional calculation unit configured to perform a proportional calculation of a difference between an active electric power command value and the active electric power measured by the electric power measuring unit and a first adder configured to add a reference frequency to an output of the first proportional calculation unit to calculate a frequency command value,
• an internal phase angle calculating portion configured to accumulate a difference between the frequency command value calculated by the frequency command value calculating portion and the frequency measured by the frequency measuring unit, to calculate an internal phase angle,
• an internal electromotive voltage command value calculating portion including a second proportional calculation unit configured to perform a proportional calculation of a difference between a reactive electric power command value and the reactive electric power measured by the electric power measuring unit and a second adder configured to add a reference voltage to an output of the second proportional calculation unit to calculate an internal electromotive voltage command value, and
• a current command value calculating portion configured to calculate a command value of an output current of the electric power converting unit from the internal phase angle, the internal electromotive voltage command value, and the voltage measured by the voltage measuring unit;
• and
• the system control device outputs the command value of the output current to the electric power converting unit to control the electric power converting unit.