Operation control apparatus for solar power system

Patent metadata

Field	Value
Publication number	US-10033189-B2
Application number	US-201314099254-A
Country	US
Kind code	B2
Filing date	Dec 6, 2013
Priority date	Jun 7, 2011
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

An operation control apparatus includes a criterion calculator that obtains an operation criterion for the power converter, based on the voltage detected by the above voltage detector on the side of the alternating-current power system, a direct-current voltage detector that detects a direct-current output voltage of the solar battery, and an operation determination device that compares the direct-current output voltage detected by the direct-current voltage detector with the operation criterion obtained by the criterion calculator, and supplies the power converter with an operation command if the direct-current output voltage is greater than the operation criterion.

First claim

What is claimed is:

1. An operation control apparatus for a solar power system that converts direct-current power from a solar battery into single-phase alternating-current power by a power converter, supplies an alternating-current power system with the single-phase alternating-current power converted, and comprises a switch at a link point between the power converter and the alternating-current power system, the operation control apparatus comprising:
a voltage detector that detects a single-phase alternating-current first voltage of the switch on a side the power converter, and a second voltage thereof on a side of the alternating-current power system;
a switch-on determination device that is input with the first and second voltages from the voltage detector on the sides of the power converter and the alternating-current power system, and supplies the switch with a switch-on command if both of the first and second voltages are approximately equal to each other;
a criterion calculator that obtains a voltage magnitude operation criterion for the power converter, by multiplying, by a margin, a moving average voltage of the magnitude of the second voltage detected by the voltage detector on the side of the alternating-current power system;
a direct-current voltage detector that detects a direct-current output voltage value of the solar battery; and
an operation determination device that compares the direct-current output voltage value detected by the direct-current voltage detector with the voltage magnitude operation criterion obtained by the criterion calculator, and supplies the power converter with a command to begin operation if the direct-current output voltage value is greater than the voltage magnitude operation criterion.

2. An operation control apparatus for a solar power system that converts direct-current power from a solar battery into a three-phase alternating-current power by a power converter, supplies an alternating-current power system with the three-phase alternating-current power converted, and comprises a switch at a link point between the power converter and the alternating-current power system, the operation control apparatus comprising:
a voltage detector that detects a first voltage of the switch on a side of the power converter, and a second voltage thereof on a side of the alternating-current power system;
a switch-on determination device that is input with the first and second voltages from the voltage detector on the sides of the power converter and the alternating-current power system, and supplies the switch with a switch-on commend if both of the first and second voltages are approximately equal to each other;
a criterion calculator that obtains a voltage magnitude operation criterion for the power converter, by multiplying, by 1.35 and a margin, a moving average voltage of the magnitude of the second voltage detected by the voltage detector on the side of the alternating-current power system;
a direct-current voltage detector that detects a direct-current output voltage value of the solar battery; and
an operation determination device that compares the direct-current output voltage value detected by the direct-current voltage detector with the voltage magnitude operation criterion obtained by the criterion calculator, and supplies the power converter with a command to begin operation if the direct-current output voltage value is greater than the voltage magnitude operation criterion.

Assignees

• Toshiba Mitsubishi Electric Industrial Systems Corp

Inventors

• Fujii Yosuke

Classifications

• H02J2101/24

  Photovoltaics · CPC title

• Y02E10/563

  Cross-Sectional Technologies · mapped topic

• H02J3/383 Primary

  Electricity · mapped topic

• H02M7/539 Primary

  with automatic control of output wave form or frequency (H02M7/5375 - H02M7/5387 take precedence) · CPC title

• H02J3/381

  Dispersed generators · CPC title