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1. 发明专利

JPH1056798A CONVERTER CONTROLLER FOR VARIABLE SPEED GENERATOR MOTOR 失效
公开(公告)号：JPH1056798A
公开(公告)日：1998-02-24
申请号：JP20844196
申请日：1996-08-07
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： NISHIOKA ATSUSHI , MIYAHARA YOJIRO , WADA AKIHISA , NAKAGAWA HIROTO , FUJII TOSHINARI
IPC分类号： H02P27/16 , H02M5/27 , H02P9/00 , H02P7/632
摘要： PROBLEM TO BE SOLVED: To provide a converter controller for a variable speed storage pump generator motor in which a firing timing causing no commutation failure can be determined even when the power supply voltage of a converter is unbalanced. SOLUTION: Secondary winding 2b of a variable speed generator motor 1 is excited with AC output from a cycloconverter 8 subjected to firing control so that the operational speed can be varied. A cycloconverter output voltage command value Ec for nullifying the difference between an exciting current command Iref and an exciting current detection value Ifb is then operated and a firing phase angle command value α operated according to a formula of cos (Ec) is delivered to a gate pulse generator 12. The gate pulse generator 12 comprises a section 14 for receiving the power supply voltage of the converter 8 detected through a transformer 13 and detecting each phase, and section 15 for comparing the detected phase with the firing phase angle command value α and generating the gate pulse for a thyristor at such timing as the former exceeds the later.

2. 发明专利

JPH10295073A APPARATUS AND METHOD FOR PHASE DETECTION 失效
公开(公告)号：JPH10295073A
公开(公告)日：1998-11-04
申请号：JP10002997
申请日：1997-04-17
申请人： HITACHI LTD
发明人： NISHIOKA ATSUSHI , WADA AKIHISA , MIYAHARA YOJIRO
IPC分类号： G01R23/10 , G01R25/08 , H02M1/08 , H03L7/08
摘要： PROBLEM TO BE SOLVED: To cope with sudden changes in the phase of an input signal, to deal with sudden changes in its amplitude and to deal with changes in frequency in a single-phase PLL circuit by a method, wherein a frequency initial value is corrected by a counted value which is found by a frequency initial-value circuit as a separate circuit from the detecting loop of the single-phase PLL circuit. SOLUTION: A frequency initial-value circuit is constituted of a filter 9, a one-cycle counting circuit 7 and a computing unit 8. In a phase-difference detection circuit 1, the phase difference Δθ between a phase detection value θ and an input signal is found on the basis of three signals, i.e., the input signal, an output signal of a multiplier 5 and a second internal reference signal. A frequency detection circuit 2 is constituted of a circuit used to amplify the phase difference Δθ and of a circuit which adds a frequency initial-value found by the frequency initial-value circuit and finds a frequency detection value. In a phase detection circuit 3, the frequency detection value is integrated so as to find a phase detection value θ. In an amplitude detection circuit 6, the difference between the output value of the input signal of the multiplier 5 is amplified, so as to find an amplitude detection value. By this constitution, the phase difference Δθ becomes small, and the output signal of the multiplier 5 is made to agree with the input signal.

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