Kabushiki Kaisha Toshiba

Toshiba Energy Systems & Solutions Corporation

Koji Toba

Takenori Kobayashi

Shunsuke Kawachi

Yoshihiro Ogita

Akinori Nishi

Yuki Kudo

Ryoichi Ichikawa

Mari Tanaka

Takahiro Yamada

Takahiro Kase

Takashi Morimoto

Hideki Noda

Daigo Kittaka

Kazuhiko Miyazaki

Noriko Nishimura

Yoko Sakauchi

Yukina Akiyama

Provided is a power converter capable of reducing cross current. The power converterincludes a phase controllerthat calculate a phase angle reference value θm based on a difference between a commanded active power reference value Pe and an output active power P supplied to a distribution line, a voltage controllerthat calculates a voltage reference values Vu, Vv, and Vw based on the phase angle reference value θm calculated by the phase controller, and a power conversion unitthat converts, based on the voltage reference values Vu, Vv, and Vw calculated by the voltage controller, an electric power supplied from a power supply sourceinto AC power and outputs it to the distribution line

Power conversion device

A startup method and startup program for microgrid that enable to stably start up the microgrid without producing frequency fluctuation is provided. An embodiment of the present disclosure is a startup method for microgrid configured by a plurality of inverter power supplies independently sharing a load and divided into a master that starts up first and a slave that starts up secondly and later, the startup method comprising: a master initial startup step of initially starting up the master in a CVCF mode; a slave initial startup step of initially starting up the slave in a grid interconnection mode; and a control mode changing step of the master and the slave changing control modes thereof when output fluctuation of the master and the slave becomes a predetermined threshold or less or when the master and the slave or other inverter power supplies become a predetermined operation state while output voltage of said master and said slave becomes a predetermined threshold or less.

Microgrid startup method and startup program

A power supply system according to the present embodiment includes a plurality of first power converters configured to supply power according to dispatching characteristics of power to be supplied to a load, and a plurality of control devices each configured to associate a change ratio of active power to an output frequency of each of the first power converters with the dispatching characteristics and control each of the first power converters based on the change ratio.

Power supply system and method for controlling power supply system

A power demand estimating apparatus includes a demand data memory, a demand estimator, and a display. The demand data memory stores plural power demand patterns and power demand amount data. The demand estimator selects, from the demand data memory, the demand pattern matching the environmental condition on an estimation day, obtains the maximum value of an power demand amount and the minimum value thereof at an expected temperature on the estimation day, calculates, using those pieces of information, the power demand amount per a unit time on the estimation day, and creates a demand estimating model. The display displays, together with the power demand pattern selected by the demand estimator, the demand estimating model.

Power demand estimating apparatus, method, program, and demand suppressing schedule planning apparatus

A power supply and demand control apparatus includes a power generation planning unit that calculates one day's power outputs of multiple distributed power sources and a power flow target of a linking point to another power system, a long-cycle control unit having a long-cycle supply-demand balancing control unit that performs control every few minutes so as to ensure the supply-demand balancing of electric energy in a given amount of time at the linking point in order to perform control for making deviations between total power output calculated by the power generation planning unit and load power in the power system constant, and a short-cycle control unit having a short-cycle supply-demand balancing control unit that performs similar control every few seconds. In the power supply and demand control apparatus, the long-cycle control unit and short-cycle control unit perform the supply-demand balancing control in a hierarchical fashion to determine output assignments of the distributed power sources.

Power supply and demand control apparatus and power supply and demand control method

According to one embodiment, the economical load dispatcher calculates a discharging threshold value and a charging threshold value based on a discharging unit price of and a charging and discharging efficiency of the secondary battery and further calculates output allocations of the generators and secondary battery such that the secondary battery is discharged when incremental fuel costs of the generators are higher than the discharging threshold value, whereas the secondary battery is charged when incremental fuel costs of the generators are lower than the charging threshold value.

Supply and demand control apparatus for electric power system, and storage medium storing supply and demand control program

To provide a secondary battery controlling apparatus and a controlling method that can keep a storage amount of a secondary battery used for supply and demand control of a power system not close to 100% or 0%. The present invention is a power supply and demand controlling apparatus of a small-scaled power systemincluding distributed power suppliesincluding a secondary battery and a controlling method, wherein the secondary battery controlling apparatus includes a power generation planning partcalculating a planned output value of the distributed power supply based on a past load power and output data including track record data of a power generation output, a planned storage amount estimating partestimating a planned storage amount of the secondary battery from the planned output value of the secondary battery calculated at the power generation planning part, an actual output detecting partmeasuring and detecting an actual output value of the secondary battery, an actual storage amount estimating partestimating an actual storage amount from the actual output value of the secondary battery detected at the actual output detecting part, and a storage amount controlling partcontrolling the actual storage amount back to the planned storage amount if there is a difference between the planned storage amount estimated at the planned storage amount estimating part and the actual storage amount estimated at the actual storage amount estimating part.

Growing community of inventors

Tama, Japan

Koji Toba