فیلتر هارمونیک فعال (قوای) and Passive Harmonic Filter (PHF) are two different types of devices used for filtering in power systems. They have significant differences in structure, working principle and performance. Here are the main differences between them:
1. Structure and Composition:
فیلتر هارمونیک فعال: AHF uses active control technology, usually composed of power electronic devices and control circuits, which can actively generate opposite harmonics or clutter signals and inject them into the power grid to achieve a filtering effect.
فیلتر هارمونیک منفعل: PHFr is a passsive filter, which is mainly composed of passive components such as inductors, capacitors and resistors, and relies on inherent frequency characteristics to achieve filtering functions.
2. Filtering Principle:
فیلتر هارمونیک فعال: AHF interferes with harmonics or clutter signals in the power grid through active control technology, and has good filtering effect and dynamic response capability.
فیلتر هارمونیک منفعل: PHF uses the frequency characteristics of passive components such as inductors, capacitors and resistors to filter out signals at specific frequencies, and the filtering effect is relatively weak.
3. Performance Comparison:
فیلتر هارمونیک فعال: AHF has good filtering effect and dynamic response capability, and can quickly and effectively suppress harmonics and clutter in the power grid.
فیلتر هارمونیک منفعل: PHF is simple in design and low in cost, but its filtering effect and dynamic response capability are relatively weak, so it is suitable for some occasions that do not require high filtering performance.
To sum up, there are obvious differences between active harmonic filter and passive harmonic filter in terms of filtering principle, structure and performance. When selecting a filter, the respective advantages and disadvantages should be weighed based on system requirements and economic considerations, and the most suitable filter type should be selected to ensure the normal operation and stability of the power system.
