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CIRCUIT FOR DETECTING HIGHER HARMONIC VOLTAGE OF VOLTAGE DETECTION TYPE ACTIVE FILTER
CIRCUIT FOR DETECTING HIGHER HARMONIC VOLTAGE OF VOLTAGE DETECTION TYPE ACTIVE FILTER
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机译:电压检测型有源滤波器的高次谐波检测电路
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摘要
PROBLEM TO BE SOLVED: To properly detect higher harmonic waves properly, even if the rate of voltage peak value of higher harmonic waves to fundamental waves is small at several %, by detecting the higher harmonic waves of power system voltage in such condition that they are resonated and enlarged, with a means for detecting the voltage being divided at the specified ratio in a specified impedance section. SOLUTION: A series circuit consisting of a specified impedance 372 section and a capacitor 373 is connected to the circuit, thus a resonance circuit with the higher harmonic frequency of power system voltage is constituted. Then, in case that the peak value of the higher harmonic voltage existing in the power system is smaller than that of the fundamental wave, the ratio of the side of the specified impedance is set to be higher, out of the ratio of the impedance by the capacitor 373 to the specified impedance 372. Hereby, the higher harmonic waves can be detected with high sensitiveness, by raising the resonance enlargement ratio, and dividing it again so that it may be the maximum rated value or under of the input signal level of an A/D converter 371, at the specified impedance 372 section.
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机译:解决的问题:即使在高谐波的电压峰值对基波的比率很小的情况下,也可以通过在这样的条件下检测电力系统电压的高谐波来正确检测高谐波:通过检测电压的装置在指定的阻抗部分中以指定的比率进行分频和放大。解决方案:该电路连接了一个由指定阻抗372部分和电容器373组成的串联电路,因此构成了一个具有较高电源系统谐波频率的谐振电路。然后,在电力系统中存在的高次谐波电压的峰值小于基波的峰值的情况下,将特定的阻抗侧的比率从阻抗的比率中设定为较高。通过将谐振放大率增大并再次分频,使其达到最大额定值或低于输入信号电平的最大值,从而可以将电容器373的阻抗增大到指定的阻抗372。 A / D转换器371处于指定的阻抗372部分。
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