DISTRIBUTED POWER SUPPLY SYSTEM
First Claim
1. A distributed power supply system, comprising:
- an inverter circuit that converts a direct current power generated by a direct current power supply to an alternating current power, and that supplies the alternating current power to a power system having a three-phase alternating current power supply;
a voltage detector that detects system voltage of the power system; and
an inverter control circuit for carrying out a PWM control by the inverter circuit,wherein the inverter control circuit includes a three-phase voltage command signal generation unit that comprises;
a three-phase fundamental wave command signal generation unit that generates three-phase fundamental wave command signals from two phase components of voltage detected by the voltage detector; and
a third harmonic signal generation unit that adds together respective third harmonics of said three phase fundamental wave command signals each having a predetermined amplitude that are calculated based on said three-phase fundamental wave command signals to generate a third harmonic signal,wherein the three-phase voltage command signal generation unit adds said third harmonic signal to the three-phase fundamental wave command signals, respectively, thereby generating three-phase voltage command signals.
1 Assignment
0 Petitions
Accused Products
Abstract
A distributed power supply system in which no simultaneous disconnection from the system occurs when a system voltage momentarily drops is provided. It includes an inverter circuit that converts a direct current power generated by a direct current power supply and that supplies the alternating current power to an alternating current power supply power system, and an inverter control circuit for carrying out PWM control of the inverter circuit, wherein the inverter control circuit includes a three-phase voltage command signal generation unit, that is configured of a three-phase fundamental wave signal generation unit that generates three-phase fundamental wave signals from two phase components of voltage detected by a voltage detector, and a third harmonic signal generation unit that adds together third harmonic components of respective phases, having a predetermined amplitude, generated based on the three-phase fundamental wave signals.
-
Citations
4 Claims
-
1. A distributed power supply system, comprising:
-
an inverter circuit that converts a direct current power generated by a direct current power supply to an alternating current power, and that supplies the alternating current power to a power system having a three-phase alternating current power supply; a voltage detector that detects system voltage of the power system; and an inverter control circuit for carrying out a PWM control by the inverter circuit, wherein the inverter control circuit includes a three-phase voltage command signal generation unit that comprises; a three-phase fundamental wave command signal generation unit that generates three-phase fundamental wave command signals from two phase components of voltage detected by the voltage detector; and a third harmonic signal generation unit that adds together respective third harmonics of said three phase fundamental wave command signals each having a predetermined amplitude that are calculated based on said three-phase fundamental wave command signals to generate a third harmonic signal, wherein the three-phase voltage command signal generation unit adds said third harmonic signal to the three-phase fundamental wave command signals, respectively, thereby generating three-phase voltage command signals. - View Dependent Claims (2, 3)
-
-
4. An inverter control circuit for PWM control of an inverter circuit that converts a direct current power generated by a direct current power supply to an alternating current power for supplying to a power system having a three-phase alternating current power supply, the inverter control circuit comprising:
-
a three-phase voltage command signal generation unit including; a three-phase fundamental wave command signal generation unit that generates three-phase fundamental wave command signals from system voltage of the power system detected by a voltage detector, and a third harmonic signal generation unit that derives a third harmonic for each phase component of the three-phase fundamental wave command signals, and adds said third harmonics of all of the phases together, based on which said third harmonic signal generation units further generates a third harmonic signal; and an adder that adds said third harmonic signal to the three-phase fundamental wave command signals, respectively, to generate three-phase voltage command signals to be used in the PWM control of the inverter circuit.
-
Specification