DC POWER SUPPLY DEVICE AND METHOD OF CONTROLLING THE SAME

• Main Author: SUGAI TAKUYA
• Format: Patent
• Language: English; Japanese
• Published: 01.08.2019
• Subjects: BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY

To prevent failures of a device caused by overload of a current to be supplied to a load.SOLUTION: A DC power supply device comprises: a power conversion circuit 21 that converts an AC power of a commercial system power source 100 into a DC power, and whose DC output side is connected with a load facility 200 and an accumulator battery 3; a charging current controller 124 that calculates a charging current control output value for controlling a charging current detection value of the accumulator battery 3 to be equal to or less than a charging current command value; an output current controller 125 that calculates an output current control output value for controlling an output current detection value of the power conversion circuit 21 to be equal to or less than an output current upper limit value; a comparator 126 that compares the charging current control output value and the output current control output value with each other, and selects and outputs the smaller one as an output voltage command value; and an output voltage controller 127 that calculates a deviation between the output voltage command value from the comparator 126 and an output voltage detection value of the power conversion circuit 21, and performs PI control to the deviation. The power conversion circuit 21 is PWM-controlled by using an output of the output voltage controller 127 as a final voltage command value.SELECTED DRAWING: Figure 1 【課題】負荷へ供給する電流の過負荷によって装置が故障することを防止する。【解決手段】商用系統電力源１００の交流電力を直流電力に変換する回路であり、直流出力側が負荷設備２００および蓄電池３に接続された電力変換回路２１と、蓄電池３の充電電流検出値を充電電流指令値以下に制御する充電電流制御出力値を求める充電電流制御部１２４と、電力変換回路２１の出力電流検出値を出力電流上限値以下に制御する出力電流制御出力値を求める出力電流制御部１２５と、前記充電電流制御出力値および出力電流制御出力値を比較し、いずれか小さい方を選択して出力電圧指令値として出力する比較部１２６と、比較部１２６からの出力電圧指令値と電力変換回路２１の出力電圧検出値との偏差をとり、その偏差に対してＰＩ制御を行う出力電圧制御部１２７と、出力電圧制御部１２７の出力を最終的な電圧指令値として、電力変換回路２１をＰＷＭ制御する。【選択図】 図１