| 摘要 |
PURPOSE:To keep easily the voltage of a receiving side constant by oscillating frequency corresponding to the receiving voltage at a receiving section of DC power transmission lines and adjusting the transmission voltage by comparing with a frequency signal and reference frequency from the receiving section at a transmitting section. CONSTITUTION:DC power is transmitted from a reactor L1 of a DC transmitting section 1 through a cable 3. DC is outputted from a receiving section 2 through a reactor L2, and at the same time, a frequency signal corresponding to the receiving voltage is formed at a voltage frequency conversion section V/F, and is transmitted from a capacitor C2 through the cable 3. The frequency signal is separated by a capacitor C1 at the transmitting section 1, is inputted into an automatic frequency controlling circuit, and is compared with oscillation frequency of a reference frequency oscillator 10 to obtain the difference. The transmission voltage is boosted or lowered at a voltage adjusting section 4 in proportion to high or low frequency of a receiving signal, and it is continued until the difference in frequency reaches zero. Accordingly, notwithstanding a variation in the cable length and load, the receiving end voltage can be kept in constant without using any cable for signal. |
