Korea Electric Power Corporation

Jung-Sung Park

Hak-Ju Lee

Woo-Kyu Chae

Jun-Bo Sim

Jong-Nam Weon

Seong-Chul Kwon

Il-Keun Song

Sang-Yun Yun

Cheol-Min Chu

Jeong-Hun Kim

Won-Wook Jung

Jong-Nam Won

Sung-Wook Hwang

The present invention relates to a method for controlling the frequency of a stand-alone microgrid wherein an energy storage device of the stand-alone microgrid is operated as a main power source by controlling a battery power conditioning system (PCS) of the stand-alone microgrid in a constant voltage constant frequency (CVCF) mode. According to the present invention, it is possible to operate the frequency stably while considering the fuel cost and power generation efficiency of a stand-alone microgrid.

Method for controlling frequency of stand-alone microgrid and power converter for energy storage device for controlling same

The present invention relates to a power conditioning system (PCS) efficiency-considered microgrid operation device comprising: a scheduling unit for scheduling outputs of a controllable load, a battery, and an emergency internal combustion generator operated in a microgrid; and an operation control unit for controlling the operation of the battery, the emergency internal combustion generator, and the controllable load according to charging/discharging of the battery, the output or the emergency internal combustion generator, and the output of the controllable load, which have been scheduled by the scheduling unit, wherein the scheduling unit schedules charging/discharging by considering the efficiency of a PCS such that a mate of charge (SOC) of the battery is maintained within a preset range. According to the present invention, the microgrid can be efficiently operated by considering the charging/discharging efficiency of the PCS.

PCS efficiency-considered microgrid operation device and operation method

Disclosed in a stand-alone micro-grid autonomous control system including: at least one battery system directly changing a reference frequency thereof according to a charge amount, and providing power having the changed reference frequency; at least one power generator measuring the reference frequency from the power provided form the at least one battery system, and starting generating power or stopping generating power based on the measured reference frequency; and at least one load measuring the reference frequency from the power provided from the battery system, and performing a synchronization operation or a synchronization releasing operation based on the measured reference frequency.

Stand-alone micro-grid autonomous control system and method

The present invention relates to an inverter device for a microgrid, and a method for controlling the same, the inverter device including: a waveform detector detecting a voltage waveform and a current waveform applied to a load; a control unit determining whether a sine wave appears based on the detected voltage waveform and the detected current waveform and performing voltage control or low order harmonic compensation depending on a determination result; and a switch generating a voltage waveform in a form of the sine wave by being turned on/off depending on a control signal received from the control unit and supplying the generated voltage waveform in the form of the sine wave to the load.

Inverter device for microgrid, and method for controlling same

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Daejeon, South Korea

Jung-Sung Park