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HVDC Control Development for Isolated Small AC System with Real Time Digital Simulator
Teruo Yoshino,Jin Lee,Chul Kyun Lee,Sung Woo Park 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper reports the control strategy and its simulator studies for HVDC transmission system feeding power to an isolated weak AC network. Authors investigated the control strategy in which the DC current control is done at the receiving-end. The combination of the receiving-end current control and the weak AC system is one of fields not yet studied in detail. The authors proposed a prototype control and evaluated it through studies with the real time digital simulator. The prototype control showed instabilities in dynamic simulation cases. Then, authors discussed and investigated the instability through the simulation and found the causes of the instability. The first point to be improved was the coordination between the current order and the actual current. The second point was the gamma control considering the large voltage phase shift at the power change in the weak AC system. The improved control was installed again in the real time digital simulator and finally verified to show good performances at step response and at the recovery from AC faults.
Body twist estimation algorithm using 3-axis acceleration sensor and magnetic sensor
Teruo Horikawa,Tomoyuki Ohkubo,Yousuke Kurihara,Kazuyuki Kobayashi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
We propose a new type of body twist measurement sensor using a 3-axis acceleration sensor and 3-axis magnetic sensor that may be applicable to sports form measurement. To measure the body twist angle, we combined the 3-axis acceleration vector and 3-axis magnetic vector by applying the singular-value decomposition technique. PSoC was used as an elemental test for the developed measurement sensor. To confirm the measurement of body twist angle, we compared it to that of several skilled baseball batters. The results suggest that the proposed method would be useful for estimating body twist angle.