Some of the improvements achieved by EVER-POWER drives in energy efficiency, productivity and process control are truly remarkable. For instance:
The savings are worth about $110,000 a year and also have cut the company’s annual carbon footprint by 500 metric tons.
EVER-POWER medium-voltage drive systems enable sugar cane vegetation throughout Central America to become self-sufficient producers of electrical energy and increase their revenues by as much as $1 million a season by selling surplus power to the local grid.
Pumps operated with adjustable and higher speed electrical motors provide numerous benefits such as greater range of flow and mind, higher head from a single stage, valve elimination, and energy Variable Speed Electric Motor saving. To accomplish these benefits, nevertheless, extra care must be taken in selecting the appropriate system of pump, motor, and electronic engine driver for optimum conversation with the procedure system. Effective pump selection requires understanding of the complete anticipated selection of heads, flows, and specific gravities. Engine selection requires appropriate thermal derating and, at times, a matching of the motor’s electrical feature to the VFD. Despite these extra design considerations, variable quickness pumping is now well recognized and widespread. In a straightforward manner, a debate is presented on how to identify the benefits that variable rate offers and how exactly to select elements for trouble free, reliable operation.
The first stage of a Variable Frequency AC Drive, or VFD, is the Converter. The converter can be made up of six diodes, which act like check valves found in plumbing systems. They allow current to flow in only one direction; the path demonstrated by the arrow in the diode symbol. For instance, whenever A-stage voltage (voltage is comparable to pressure in plumbing systems) is usually more positive than B or C phase voltages, then that diode will open up and allow current to flow. When B-phase turns into more positive than A-phase, then your B-phase diode will open and the A-stage diode will close. The same is true for the 3 diodes on the negative side of the bus. Hence, we obtain six current “pulses” as each diode opens and closes.
We can get rid of the AC ripple on the DC bus with the addition of a capacitor. A capacitor functions in a similar fashion to a reservoir or accumulator in a plumbing program. This capacitor absorbs the ac ripple and provides a soft dc voltage. The AC ripple on the DC bus is normally less than 3 Volts. Thus, the voltage on the DC bus turns into “approximately” 650VDC. The actual voltage depends on the voltage level of the AC range feeding the drive, the level of voltage unbalance on the power system, the electric motor load, the impedance of the energy program, and any reactors or harmonic filters on the drive.
The diode bridge converter that converts AC-to-DC, is sometimes just known as a converter. The converter that converts the dc back again to ac is also a converter, but to tell apart it from the diode converter, it is usually referred to as an “inverter”.
Actually, drives are an integral part of much bigger EVER-POWER power and automation offerings that help customers use electrical energy effectively and increase productivity in energy-intensive industries like cement, metals, mining, oil and gas, power generation, and pulp and paper.