Comparison between flexible AC transmission systems (FACTs) and filters regarding renewable energy systems harmonics mitigation

Renewable energy growing is considered one of the main sources of the system harmonics. Thus, in this paper, Total Harmonic Distortion (THD) is reduced by using flexible AC transmission systems (FACTs). Static Compensator (STATCOM) and Static Synchronous Series Compensator (SSSC) are used and compared against basic harmonics filter. Cases studied are as follows: First, the system is studied without any harmonic limitation. Then each type of the chosen two types of (FACTs) is connected to the system. Finally, the harmonics filter is used as a reference to verify the (FACTs) effectiveness. MATLAB/SIMULINK is the tool to examine and simulate the system.

Multi-Objective Tabu Search for the Location and Sizing of Multiple Types of FACTS and DG in Electrical Networks

Flexible AC transmission systems and distributed generation units in power systems provide several benefits such as voltage stability, power loss minimization, thermal limits enhancement, or enables power system management close to the limit operation points; and by extension, economic benefits such as power fuel cost and power loss cost minimization. This work presents a multi-objective optimization algorithm to determine the location and size of hybrid solutions based on a combination of Flexible AC transmission systems devices and distributed generation. Further, the work expands the types of FACTS usually considered. The problem is solved by means of a Tabu search algorithm with good results when tested in a network of 300 nodes.

Control of a Modular Multilevel Matrix Converter for Unified Power Flow Controller Applications

The modular multilevel matrix converter has been proposed as a suitable option for high power applications such as flexible AC transmission systems. Among flexible AC transmission systems, the unified power flow controller stands out as the most versatile device. However, the application of the modular multilevel matrix converter has not been thoroughly analyzed for unified power flow controller applications due to the sophisticated control systems that are needed when its ports operate at equal frequencies. In this context, this paper presents a cascaded control structure for a modular multilevel matrix converter based unified power flow controller. The control is implemented in a decoupled reference frame, and it features proportional-integral external controllers and internal proportional multi-resonant controllers. Additionally, the input port of the modular multilevel matrix converter is regulated in grid-feeding mode, and the output port is regulated in grid-forming mode to provide power flow compensation. The effectiveness of the proposed vector control system is demonstrated through simulation studies and experimental validation tests conducted with a 27-cell 5 kW prototype.

Improving the reliability of UPS Central Asia implementation of FACTS devices

The article analyzes the issues of increasing the reliability, stability, improving the control of power flows in electrical networks in the Unified Power System of Central Asia on the basis of the introduction of the Flexible AC Transmission Systems (FACTS) technology. The solution of the problems of regulation of operating parameters of electrical sistems is considered. An assessment of the economic effect from the introduction of FACTS technology in the energy system of Uzbekistan has been carried out.