Introduction
Inverter unbalanced load compensation is an important technique for improving power quality. Unbalanced load compensation can be achieved by either a passive or active load compensation method. Passive load compensation is a conventional method, which involves connecting additional inductors and capacitors in the system. This method is effective, but due to its requirements for high efficiency and long-term stability, it is usually expensive.
Active load compensation, on the other hand is a more effective, efficient and cost-effective method. It consists of connecting an active device to the system, either in series or parallel, to perform a certain control loop. Such devices contain controllers such as pulse width modulation (PWM) converters, static relays, or thyristors. The controller measures the parameters of the unbalanced load and accordingly adjusts the PWM output so as to reduce the harmonic distortion and power factor. Active load compensation is a novel and preferred method in power quality improvement.
Installation
The installation of an active reactive compensation device (or active power filter) is relatively simple. The first step is to determine the location of the device in the system. Depending on the nature of the unbalanced load, the device can be installed in series or parallel. Once the installation location is identified, the device is connected to the inverter and the power distribution system.
After the devices are physically connected, the next step is to set the power factor and distortion levels using the built-in controller. Various settings can be adjusted to achieve desired levels of power quality. For example, if an active filter is installed to reduce harmonic distortion, settings such as pulse width modulation ratio, transient response, current order limit, and low-pass filter parameter can all be tuned to achieve the desired levels of harmonic distortion.
Finally, it is necessary to perform a safety check. Before the system is connected to the grid, it is important to ensure that the device settings are not set beyond the safe limits, and all necessary safety protocols are followed.
Conclusion
In conclusion, active power filters are an effective and efficient way of improving power quality. By connecting an active power filter to an inverter, it is possible to reduce the amount of harmonic distortion and improve the power factor. The installation of an active power filter is relatively simple, and can be completed with minimal disruption to the existing system. However, it is important to ensure that all necessary safety protocols are followed.
