Everyone must know about filters. Filters are divided into many types according to different uses and working principles. Among them, there are active power filters and passive power filters. What is the difference between them? What is the difference? The following is an analysis of the difference between active power filters and passive power filters.
working principle
Passive filters are composed of passive components such as LC, which are designed to have extremely low impedance at a certain frequency, and shunt the harmonic current of the corresponding frequency. Its behavior mode is to provide a passive harmonic current bypass channel; while the active filter is composed of The power conversion equipment composed of power electronic components and DSP detects the load harmonic current and actively provides the corresponding compensation current. The compensated source current is almost pure sine wave, and its behavior mode is active current source output. The active filter injects a current with the same amplitude, the same phase and the opposite direction to the original harmonic current into the power grid, so that the total harmonic current flowing into the power supply is zero; the passive filter is based on the inherent impedance of the capacitor resistance. It has low impedance to harmonics of a certain frequency, provides a lower impedance channel for the load harmonic current, and forms a shunt relationship with the grid reactance, so that most of the harmonic current of this frequency flows into the filter and not into the grid.
Functional effect
Passive filters can only filter out a fixed number of harmonics; but they can completely solve the harmonic problems in the system, solve practical problems in the process of enterprise power consumption, and can meet the standards of the national power department; active filters can dynamically Filter out each harmonic. The filtering effect of the active filter can reach about 95%, which can dynamically filter out harmonics while suppressing flicker and compensating for reactive power; while the filtering effect of the passive filter is about 65%, which can only filter out certain One or more specific frequency harmonics.
Cost of construction
The passive filter has a simple structure and low cost; the active filter has high filtering efficiency and is slightly more expensive than the passive filter. However, with the development of the times, the product quality and technology are improving, and the leading Beijing company is independent. The CAPF developed and produced, while ensuring product quality, achieves the greatest price concessions, achieves active effects at passive prices, and restores a green grid environment for your enterprise. The cost of active filters is more than 3 times that of passive filters, the technology is relatively immature, and the maintenance cost is high; the cost of passive filters is relatively low, the technology is relatively mature, and basically maintenance-free after installation.
frequency change
The resonance point of the passive filter is shifted, and the effect is reduced; the active filter is not affected.
Application
Active filter capacity does not exceed 100KVA for a single set, while passive filter has no such limitation;
When active filtering provides filtering, it cannot or rarely provides reactive power compensation because it takes up capacity; while passive filtering provides reactive power compensation at the same time.
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