PHASE-LOCKED LOOP, POWER CONVERSION DEVICE AND PHASE SYNCHRONIZATION METHOD

• Main Author: OKUMURA TOSHIAKI
• Format: Patent
• Language: English; Japanese
• Published: 16.05.2016
• 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; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

PROBLEM TO BE SOLVED: To improve a precision of phase synchronization in a phase-locked loop for single-phase AC.SOLUTION: The phase-locked loop is configured to further perform coordinate transformation on a voltage from an α-β coordinate system after quadrature coordinate transformation from three phases to two phases into a d-q coordinate system that is a rotation coordinate, and controls an ineffective voltage component into 0. As voltages Vα and Vβ in the α-β coordinate system, the phase-locked loop uses a real voltage of the single-phase AC subjected to phase synchronization as Vα and uses a value that is a time differentiation value of Vα and includes a frequency of the single-phase AC in a coefficient, as a pseudo voltage Vβ.SELECTED DRAWING: Figure 10 【課題】単相交流用の位相同期ループにおける位相同期の精度を向上させる。【解決手段】この位相同期ループは、３相から２相へ直交座標変換後のα−β座標系からさらに、回転座標であるｄ−ｑ座標系へ電圧を座標変換し、無効電圧成分を０にするよう制御する位相同期ループであって、α−β座標系における電圧Ｖα，Ｖβとして、位相同期の対象となる単相交流の実際の電圧をＶαとし、かつ、Ｖαの時間微分値であって単相交流の周波数を係数に含む値を擬似的な電圧Ｖβとして使用する位相同期ループである。【選択図】図１０