One of the main measures to improve power consumption efficiency is still to reduce losses through voltage regulation and reactive power compensation. Reactive power compensation allows you to increase the efficiency of energy use in three main areas: increasing the capacity of lines and transformers, reducing active energy losses, and normalizing voltage. Reducing reactive power allows you to reduce active losses by reducing the total current [1, p. 12]. Thus, reactive power compensation can be fully called one of the energy-saving technologies. The composition of reactive power consumers shows that the main part of the reactive power is consumed by four types of devices: asynchronous motors - 40% (as well as household, agricultural electric motors, and asynchronous electric drives for the needs of power plants), electrical installations. - 8 %; valve converters - 10%, transformers of all stages of transformation (losses in them) - 35%, power lines (losses in them) - 7%. Since the inductive load predominates, inductive reactive power must be transmitted along with active power through the network. Reactive power is not related to the useful operation of the electrical receiver and is spent on creating electromagnetic fields in electric motors, transformers, and lines. Compensation of reactive power is its generation or consumption using compensating devices [2, p.3]. The principle of reactive power compensation is as follows. The current through the capacitor was found to lead the applied voltage by 90°, while the current through the inductor lags the applied voltage by 90°. So capacitive current is opposite to inductive current and reactive power will create an electric field which is opposite in the sense that reactive power creates a magnetic field. Therefore, capacitive current and capacitive power are generally considered negative compared to magnetizing current and magnetizing power, which are usually considered positive. Thus, the numerically equal reactive capacitance and magnetizing power are mutually “destroyed” (QC - QL = 0), and the network is unloaded from the flow of the reactive component of the load current.

The appearance of higher harmonics in the supply voltage causes several negative phenomena in electricity consumers:

• increased heating due to increased resistance of electrical installation windings when the skin effect occurs - total losses can increase by 5% to 12%; total losses only at the 5th, 7th, and 11th harmonics can reach 2 – 4% of the nominal ones.

• rapid loss of mechanical and dielectric properties of the insulation of electrical machines and devices due to increased heating.

• overheating and reduced service life of capacitor banks due to overloading them with resonant currents arising at the frequencies of harmonic components.

• the error of induction energy meters and other similar measuring devices can increase up to 10%, which is completely unacceptable in practice.

• incorrect actions of protective relays, failures of automation, dispatching, and network communication systems.

• reduction in productivity and reduction in product quality of electrolysis plants, etc.

In the case of using frequency converters and their influence on the network at relatively low values of the harmonic content coefficient (8.5-10%) in the network voltage, the use of network chokes (reactors) gives good results. These are inductors connected in series in front of the electricity consumer, smoothing the curve of the flowing current. The physical meaning of this technique is that between the network and the frequency converter, a damping energy storage device appears, facilitating a smoother flow of processes under sharply variable loads. In such cases, the consumer is underutilized in terms of supply voltage by 3% to 6%. At the same time, however, the use of network chokes for frequency converters allows you to obtain several benefits:

• reduces the influence of the frequency converter on the network - the voltage shape at the connection point is as close as possible to sinusoidal, thereby eliminating the impact on other consumers.

• protects the converter from surges and dips in the supply voltage and interference on the control and protection circuits.

• protects the capacitor bank in the DC link from the effects of resonant currents, increasing its service life.

• significantly limits the magnitude and rate of increase of emergency currents (short circuit), thereby protecting power semiconductor devices from thermal destruction and reducing the requirements for the speed of protection circuits.

According to some data, these properties make it possible to increase the reliability of frequency converters by up to 5–7 times.

An essential property of the use of network chokes is that in cases of multiple connections of several consumers at one point in the network (for example, for multi-motor roller table drives, etc.), with their characteristics known and restrictions on the voltage quality at the connection point, it is possible to calculate the necessary network chokes for all parallel consumers. Thereby ensuring that the quality of the network voltage complies with current standards and eliminates the mutual influence of one converter on the other.

Certain models of frequency converters must always, without exception, be used with line chokes. An important circumstance is that in cases where the frequency converter fails due to the influence of poor-quality network voltage or pulse overvoltage, the supplier company does not assume warranty obligations. All losses of a material nature are borne by the consumer.

Devices Smart- Optimizer ECOD performs all the above functions. Optimizes voltage and current, reduces peak power, reduces reactive components of the load, and filters harmonics.