# Analysis of Plasma Reactor Interaction with the Power Grid Depending on the Power Supply Design
## 6 Conclusions  
The article investigates the cooperation of a plasma reactor with four types of power supplies in electricity. These power supplies were constructed at the Department of Electrical Engineering and Electrotechnologies of Lublin University of Technology for the purpose of carrying out research projects on plasma applications in technology and industry. However, no detailed research had been conducted on their interaction with the plasma reactor. \begin{table}
\begin{tabular}{l l l l l} \hline \hline
**Power Supply Type** & **TPS** & **ITPS** & **IFCTPS** & **PCS** \\ \hline Maximum efficiency for argon & 25\% & 18\% & 35\% & 36\% \\ \hline Maximum efficiency for helium & 26\% & 20\% & 20\% & 40\% \\ \hline Maximum efficiency for nitrogen & 72\% & 20\% & 18\% & 20\% \\ \hline Maximum efficiency for air & 70\% & 28\% & 25\% & 28\% \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Efficiencies of power supplies for a burning discharge in different plasma gases. \begin{table}
\begin{tabular}{l l l l l l} \hline \hline \multirow{2}{*}{**Power Supply Type**} & \multirow{2}{*}{**Parameter**} & \multicolumn{2}{c}{**Gas**} & & \\ \cline{3-5}  & & **Argon** & **Helium** & **Nitrogen** & **Air** \\ \hline \multirow{2}{*}{TPS} & \(I_{\text{THD}}\) & 24\% & 184\% & 92.4\% & 64\% \\ \cline{2-5}  & \(U_{\text{THD}}\) & 3.54\% & 3.3\% & 3.83\% & 4\% \\ \hline \multirow{2}{*}{ITPS} & \(I_{\text{THD}}\) & 61.2\% & 36.9\% & 77.3\% & 75.2 \\ \cline{2-5}  & \(U_{\text{THD}}\) & 2.64\% & 2.43\% & 3.19\% & 1.2\% \\ \hline \multirow{2}{*}{IFCTPS} & \(I_{\text{THD}}\) & 24.7\% & 19.5\% & 148\% & 133\% \\ \cline{2-5}  & \(U_{\text{THD}}\) & 7.86\% & 4.54\% & 3.72\% & 3.71\% \\ \hline \multirow{2}{*}{PCS} & \(I_{\text{THD}}\) & 163\% & 148.4\% & 148.3\% & 146.7\% \\ \cline{2-5}  & \(U_{\text{THD}}\) & 5.3\% & 5.07\% & 4.78\% & 4.75\% \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Harmonic content ratios. From the current analysis, it appears that all the power supplies tested exhibit poor interaction with the plasma reactor, where the discharges burn in nitrogen or in air. In nitrogen and air, the discharges burn unstably which manifests as interference in the plasma reactor's operating cycle. These disturbances are transferred to the power supplies, degrading their operational parameters. In the case of IFCTPS and ITPS power supplies, the discharge burning in nitrogen and air is also characterised by a narrow discharge power control range. In the case of argon and helium discharges, all the power supplies tested were able to achieve cyclic and stable discharges in the plasma reactor with a wide range of power control. The measurements show that the primary design defect of the power supplies tested is an overestimation of their power ratings in relation to the maximum discharge power burning in the reactor. Of all the power supplies tested, the PCS converter power supply exhibits the greatest number of characteristics predisposing it to powering plasma reactors. This power supply does not have the best control characteristics of all the power supplies tested, but it guarantees correct burning of the discharge in the plasma reactor for all plasma gases. A major advantage of the PCS power supply is the ability to shape the plasma parameters by varying the frequency of the supply voltage. In the case of this power supply, an intermediate transformer has a major influence on its interaction with the plasma reactor. In the research carried out, the TPS transformer power supply system played the role of the intermediate transformer. The TPS power system had the best interaction with the plasma reactor of all the power supplies tested. When combined with the PCS, problems were generated by the electronic ignition system. This system is not only characterised by a high failure rate, but also generates high conducted interference, disturbing the operation of the AC/DC/AC converter.