Power conversion device suppressing phase jump

A power conversion device comprising:

• a power converter located between AC wiring, to which a power generator and an electrical load are connected, and DC wiring, to which an energy storage is connected, the power converter is configured to convert AC power inputted to the power converter through the AC wiring into DC power and charge the energy storage with the DC power, and to convert DC power inputted to the power converter through the DC wiring, the DC power is discharged from the energy storage, converted into AC power and the AC power is outputted to the AC wiring;
• a voltage detector that detects a system voltage at the AC wiring side of the power converter;
• a target current value calculator that calculates, on an assumption that a virtual synchronous phase modifier is connected instead of the power conversion device, a target current value from a voltage difference between an internal electromotive force voltage in the virtual synchronous phase modifier and the system voltage detected by the voltage detector, and
• circuitry that performs power conversion control between the AC wiring and the DC wiring by transmitting a drive signal to the power convener, wherein
• the circuitry includes:
• a phase calculator that calculates a current phase from the system voltage detected by the voltage detector;
• a phase jump angle calculator that calculates a virtual phase that follows temporal changes in the current phase in a lagging manner, and calculates a phase difference between the current phase and the virtual phase as a phase jump angle;
• and
• a drive signal generator that generates the drive signal to the power converter, which is a signal for adjusting active power that is inputted to or outputted from the power converter so as to suppress the phase jump angle, wherein
• the drive signal generator generates the drive signal such that an alternating current outputted from the power converter to the AC wiring is adjusted to the target current value.

A power conversion device comprising:

• a power converter located between AC wiring, to which a power generator and an electrical load are connected, and DC wiring, to which means for storing energy is connected, the power converter configured to convert AC power inputted to the power converter through the AC wiring into DC power and charge the means for storing energy with the DC power, and to convert DC power inputted to the power converter through the DC wiring, the DC power is discharged from the means for storing energy, converted into AC power and the AC power is outputted to the AC wiring;
• means for detecting voltage that detects a system voltage at the AC wiring side of the power converter;
• an active power obtainer that obtains active power at the AC wiring side of the power converter;
• and
• circuitry that performs power conversion control between the AC wiring and the DC wiring by transmitting a drive signal to the power converter, wherein
• the circuitry includes:
• a phase calculator that calculates a current phase from the system voltage detected by the means for detecting voltage;
• a phase jump angle calculator that calculates a virtual phase that follows temporal changes in the current phase in a lagging manner, and calculates a phase difference between the current phase and the virtual phase as a phase jump angle;
• and
• a drive signal generator that generates the drive signal to the power converter, which is a signal for adjusting active power that is inputted to or outputted from the power converter so as to suppress the phase jump angle, wherein
• the phase jump angle calculator includes:
• an angular velocity calculator that calculates, on an assumption that a virtual synchronous phase modifier is connected instead of the power conversion device, an angular velocity in the virtual synchronous phase modifier by using the obtained active power and a value that is based on a virtual inertia moment in the virtual synchronous phase modifier;
• and
• an integrator that calculates, as the virtual phase, a phase in the virtual synchronous phase modifier by integrating the angular velocity.

A power conversion device comprising:

• a power converter located between AC wiring, to which a power generator and an electrical load are connected, and DC wiring, to which means for storing energy is connected, the power converter configured to convert AC power inputted to the power converter through the AC wiring into DC power and charge the means for storing energy with the DC power, and to convert DC power inputted to the power converter through the DC wiring, the DC power is discharged from the means for storing energy, converted into AC power and the AC power is outputted to the AC wiring;
• means for detecting voltage that detects a system voltage at the AC wiring side of the power converter;
• a target current value calculator that calculates, on an assumption that a virtual synchronous phase modifier is connected instead of the power conversion device, a target current value from a voltage difference between an internal electromotive force voltage in the virtual synchronous phase modifier and the system voltage detected by the means for detecting voltage, and
• circuitry that performs power conversion control between the AC wiring and the DC wiring by transmitting a drive signal to the power converter, wherein
• the circuitry includes:
• a phase calculator that calculates a current phase from the system voltage detected by the means for detecting voltage;
• a phase jump angle calculator that calculates a virtual phase that follows temporal changes in the current phase in a lagging manner, and calculates a phase difference between the current phase and the virtual phase as a phase jump angle;
• and
• a drive signal generator that generates the drive signal to the power converter, which is a signal for adjusting active power that is inputted to or outputted from the power converter so as to suppress the phase jump angle, wherein
• the drive signal generator generates the drive signal such that an alternating current outputted from the power converter to the AC wiring is adjusted to the target current value.