摘要
提出了一种新颖的高压直流输电系统直流侧谐波电压的测量方案。该方案测量流过直流侧滤波器的电流,根据对该电流的谐波分析结果,结合滤波器的元件参数或已知的阻抗-频率特性,即可简单方便地计算得到直流侧的谐波电压。该方法仅需在传统直流滤波器的基础上进行简单改造即可实现,测量电压谐波准确度高,扩展了直流滤波器的功能。并且给出了该方案的原理和谐波电压的计算方法,分析了利用不同滤波器进行谐波电压测量的优劣,研究了滤波器参数变化对谐波电压测量结果的影响,并考虑了不同谐波源叠加的情况。通过仿真计算和实验验证了所提出方法的正确性和有效性。该方法易于实现,计算简单,能够在进行谐波滤除的同时提供高准确度的高压直流谐波电压测量,具有较好的实用价值和应用前景。
The paper proposes a novel method to measure HVDC harmonic voltage measurement at DC side. The harmonic voltage at DC side can be calculated easily by measuring the current flowing through the filter, combined with the filter parameters or the impedance-frequency characteristics of the filter. This method is realized by modifying the conventional filter, which can achieve high accuracy measurement of the voltage harmonics and expand functions of the DC filter. The paper presents the principles of this method and the harmonic voltage calculation method. Then, the advantages and disadvantages of different filters for harmonic voltage measurements are analyzed. Moreover, the influence on the harmonic voltage measurement is analyzed as the filter parameters changed. The superposition of different harmonic is also taken into account. Simulation and experiment test verify the proposed method. It is shown that this method is easy to implement, and has the advantages of simply calculation and high precision measurements.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第22期144-152,共9页
Transactions of China Electrotechnical Society
