Veichi is actively promoting a very cool concept of a frequency converter - a hybrid frequency converter with PV and AC input. This means that this frequency converter can be powered both from the regular grid and from solar panels. Moreover, it offers automatic switching between inputs and a blending mode.
Let's consider it in detail. Visually, it's a typical AC310 series frequency converter. This is not surprising, as the AC300 chassis proved to be very successful, and VEICHI is now actively using it in the development of new series. The number and arrangement of control terminals are similar to AC310. It supports working with synchronous and asynchronous motors, vector control mode, and various expansion boards. The only thing missing is the ability to connect a braking resistor, and in general, the DC link is replaced by a PV input. Thus, we have a regular frequency converter that can be additionally powered by the sun. It is mainly considered for water supply – working with pumps.
But in fact, it is now finding more and more applications.
For example, imagine you have some production facility with a motor that runs continuously or starts frequently. Let's take an 11 kW compressor as an example. Usually, a compressor is the main mechanism that must operate to ensure production. For it, an alternative power supply will be provided in any case (especially when there are power outage schedules). This can be either a generator or a solar power plant. When connecting from a generator to a compressor, a frequency converter is installed to eliminate starting currents. A frequency converter is also needed when operating from a solar inverter. SES owners know what is needed for this. This requires: 1. Solar panels, a hybrid inverter, batteries, as well as automation and various protections. But with SI23, only solar panels are needed, which are directly connected to the hybrid frequency converter. This significantly reduces the cost of operation from panels. Let's compare prices.
A regular 11 kW frequency converter of the AC310 series (AC310-T3-011G/015P-B) costs $585, while SI23 SI23-D5-011G-A costs $602. As you can see, the price difference is not significant. The costs of purchasing a separate hybrid inverter and its connection will be much higher.
Thus, by installing a hybrid frequency converter, we have the following operating mode. In the morning, when the sun rises, the system operates in blending mode, taking energy from the panels, and any deficit is compensated from the grid. As the sun rises above the horizon, the system switches to solar power, consuming nothing from the grid, then closer to sunset, the blending mode operates again. And after sunset – operation from the grid or a generator. This way, significant savings can be made on compressor operation. With increasing power, the economic effect will be more pronounced.
If you are interested in this solution, please contact us. We will help you make your production more efficient.
