A few of the improvements achieved by EVER-POWER drives in energy efficiency, productivity and procedure control are truly remarkable. For instance:
The savings are worth about $110,000 a year and have slice the company’s annual carbon footprint by 500 metric tons.
EVER-POWER medium-voltage drive systems allow sugar cane plant life throughout Central America to be self-sufficient producers of electrical energy and boost their revenues by as much as $1 million a yr by Variable Speed Electric Motor selling surplus capacity to the local grid.
Pumps operated with adjustable and higher speed electrical motors provide numerous benefits such as greater selection of flow and head, higher head from a single stage, valve elimination, and energy conservation. To attain these benefits, however, extra care must be taken in selecting the appropriate system of pump, motor, and electronic engine driver for optimum interaction with the procedure system. Successful pump selection requires understanding of the complete anticipated selection of heads, flows, and specific gravities. Motor selection requires appropriate thermal derating and, at times, a coordinating of the motor’s electrical feature to the VFD. Despite these extra design factors, variable rate pumping is becoming well accepted and widespread. In a straightforward manner, a discussion is presented on how to identify the benefits that variable swiftness offers and how to select components for trouble free, reliable operation.
The first stage of a Adjustable Frequency AC Drive, or VFD, is the Converter. The converter can be made up of six diodes, which are similar to check valves found in plumbing systems. They allow current to stream in only one direction; the path shown by the arrow in the diode symbol. For example, whenever A-phase voltage (voltage is comparable to pressure in plumbing systems) is definitely more positive than B or C stage voltages, then that diode will open up and invite current to movement. When B-stage becomes more positive than A-phase, then the B-phase diode will open up and the A-stage diode will close. The same holds true for the 3 diodes on the negative side of the bus. Thus, we obtain six current “pulses” as each diode opens and closes.
We can eliminate the AC ripple on the DC bus by adding a capacitor. A capacitor functions in a similar style to a reservoir or accumulator in a plumbing system. This capacitor absorbs the ac ripple and provides a clean dc voltage. The AC ripple on the DC bus is normally significantly less than 3 Volts. Therefore, the voltage on the DC bus turns into “approximately” 650VDC. The actual voltage will depend on the voltage degree of the AC line feeding the drive, the level of voltage unbalance on the energy system, the engine load, the impedance of the energy system, and any reactors or harmonic filters on the drive.
The diode bridge converter that converts AC-to-DC, may also be just referred to as a converter. The converter that converts the dc back to ac can be a converter, but to distinguish it from the diode converter, it is generally known as an “inverter”.
In fact, drives are a fundamental element of much bigger EVER-POWER power and automation offerings that help customers use electricity effectively and increase productivity in energy-intensive industries like cement, metals, mining, oil and gas, power generation, and pulp and paper.