###### Abstract
The power factor is applied as the universal criterion for the electromagnetic compatibility of distorted current in PDL and distorting loads. However, ways to reduce the distortion and reactive power are not presented. The publication [8] presents an LED driver consisting of an interleaved buck-boost power factor correction (PFC) converter with coupled inductors and a half-bridge LLC resonant converter. Using this driver reduces the reactive power provided in the PDL. However, the integrated buck-boost PFC converter with coupled inductors significantly increases the cost of this driver. The publication [9]  
Figure 1: The 32 kW LED wall display at a sports arena: (**a**) Installation of the wall display; (**b**) Time diagram of active and reactive power at the point of LED wall display connection to 0.4 kV power distribution line. presents a two-stage LED driver based on commercial integrated circuits. The first stage consists of an AC-DC power factor correction unit. The second stage consists of a DC/DC power converter. This two-stage LED driver, as with the driver presented in [9], improves the power factor but increases the cost of LED light devices due to its complexity. The publication [10] presents a high-power factor LED driver. Using such a driver in LED light devices would not cause the aforementioned problems with power factor correction. In addition, there would be no need for the proposed method of compensation. However, this is the technology of the future and will not solve the above-mentioned power factor problems caused by already installed LED light devices. A publication [11] presents a power factor improvement method based on teaching-learning-based optimization. Using this method, the optimal capacitor combination to improve the power factor is calculated. However, this method is only applicable in the presence of lagging reactive power and is not suitable for compensating the reactive power of LED light devices. Various methods for reactive power compensation have been presented in [12]. One of them, using Thyristorized Var Compensators, can compensate for both types of leading and lagging reactive power. This approach would be appropriate to address the problems mentioned above. However, the use of Thyristorized Var Compensators involves additional investment and financial costs. The Static var Compensator presented in [13] also requires additional investment and financial costs. The global VFD market size was valued at USD 22.5 billion in 2021 and is expected to grow at a compound annual growth rate of 6.5%. Most industrial and entertainment buildings equipped with LEDs are also equipped with a large amount of AC-DC-AC VFDs. These VFDs are used to power the induction motor of fans, pumps and other equipment. About 70 AC-DC-AC VFDs have been installed in the aforementioned sports arena. A further study examined the reactive power provided by LEDs and single-phase supply conventional AC-DC-AC VFD. The possibility of modernizing the VFD by supplementing the DC circuit with capacitors, at the same time transforming the VFD into a reactive power compensation and power factor improvement device, was investigated (Figure 3). This possibility of modernization has been tested mathematically and experimentally. Figure 2: The loads and compensation device of the 0.4 kV power distribution lines: (**a**) Conventional load of power distribution lines; (**b**) Modern load of power distribution lines (causes overcompensation). Applying the VFD improvement proposed in this article could improve the PDL power factor with relatively little investment. This is an advantage in terms of energy costs and, at the same time, in terms of ecology and climate change. The low cost of the compensation method is due to the fact that no additional expensive compensation equipment based on inductive reactors is required. It is enough to modernize the already installed VFD by adding low-cost components--electrolyte capacitors, small control and switching means.