POWER CONVERSION DEVICE

• Main Authors: ITO TOMOMICHI, ICHINOSE MASAYA, ABE YUSUKE, TAKEMOTO YOSHITAKA, NEMOTO JIRO, TANIGUCHI MASAHIRO
• Format: Patent
• Language: English; Japanese
• Published: 06.12.2018
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

To provide a power conversion device that lessens overcurrent as much as possible by further improving the responsiveness to delayed following of secondary side voltage (output voltage of the power conversion device) caused when a system accident point is generated on the primary side of an interconnection transformer.SOLUTION: The power conversion device comprises an inverter connected to a system via an LC filter, and an inverter control unit that controls the inverter. In control which is performed by the inverter control unit, a transient variation current suppression voltage estimation value which is a voltage deviation at the time of a system accident, is estimated on the basis of inverter output current sampled multiple times during a calculation cycle and an interconnection point voltage at an inverter interconnection point, the transient variation current suppression voltage estimation value is added, as a feedforward, to a signal for controlling current flowing through the inverter, so that a voltage command is created, and the voltage command is used as a PWM voltage command for the inverter.SELECTED DRAWING: Figure 1 【課題】系統事故点が連系トランス一次側で発生した場合に発生する、二次側電圧（電力変換装置の出力電圧）の追従遅れの応答性を更に向上させ過電流をできるかぎり小さく抑制する電力変換装置を提供する。【解決手段】系統にＬＣフィルタを介して接続されるインバータと、インバータを制御するインバータ制御部と、を有する。インバータ制御部が行う制御には、演算周期内に複数回サンプリングをしたインバータ出力電流とインバータ連系点の連系点電圧に基づき、系統事故時の電圧偏差である過渡変動電流抑制用電圧推定値を推定し、インバータに流れる電流を制御する信号に、過渡変動電流抑制用電圧推定値をフィードフォワードとして加算して電圧指令を作成し、電圧指令をインバータのＰＷＭ用電圧指令として用いる制御をする。【選択図】図１