Upfc Unified Power Flow Controller MATLAB — Simulation & Power Modeling

Abstract — Upfc Unified Power Flow Controller MATLAB

experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Globally all power utilities are striving to cater to the ever-increasing demand for electrical energy by either adding new transmission lines or by optimizing the already existing ones with an objective of transmitting higher degrees of power. The construction of new transmission infrastructure, however, is limited by higher costs and regulatory hurdles. Also, the flow of power in transmission networks oftentimes follows very undesirable pathways and system stability is heavily dependent on voltage changes between lines. A successful answer to these problems is the intelligent regulation of power flow in transmission network. This study provides high-level operational evaluation of Flexible Alternating Current Transmission System (FACTS) strategies, namely Unified Power Flow Controller (UPFC) and Distributed Power Flow Controller (DPFC), which are analysed through their active power exchange characteristics. The UPFC has a common DC link among its shunt-series converters. On the other hand, DPFC does not require a common DC-link and instead replaces each of threeIphase series converters with multiple singleIphase distributed converters which are placed along the transmission line. MATLAB/Simulink is used for modelling and simulation of UPFC and DPFC operating behaviours to observe their performance in controlling power flow with respect to Total Harmonic Distortion (THD). It can be seen from the load flow simulation results, under normal operation condition DPFC transfer larger amount of the active power (i.e., 0.301 MW vs.

Analytical & State-Space Control Methodology

0.290 MW) with lower voltage THD (i.e., 9.04% vs. 15.26%) than UPFC. In a three-phase faults scenario, the DPFC continues to carry out better performance with 0.280 MW active power (i.e., UPFC: 0.250 MW), 0.072 MVAR reactive power (i.e., UPFC: 0.058 MVAR) and minimized voltage THD. These findings show that the DPFC outperforms all other FACTS devices in terms of voltage stability and power transfer capacity, confirming its increased reliability for applications involving transmission Power quality has become one of the top issues regarding electric power utilities in recent years. Power quality suggests to the extent of deviation in transmission and use of electrical energy, affecting the performance of electrical equipment. Medium voltage power systems are prone to voltage disturbances, most of which are manifested in the form of voltage sag; this is one of the main causes of poor power quality. This is generally caused by a connection of heavy loads like large induction motors, industrial boilers connecting quickly. Dynamic voltage restorers (DVRs) have been extensively used to mitigate voltage sags by compensating sudden changes in the system impedance. Additionally, equipment like UPFC and Static Synchronous Compensator (STATCOM) is applied to improve voltage quality at the buses of transmission and distribution. In this paper, the Dynamic Power Flow Controller (DPFC), an active FACTS device, is introduced to solve power and current waveform distortions in a second time frame to improve power quality. The DPFC, which has been proposed initially as a derivation of same UPFC structure with an original one shunt converter actually connected on the transmission line and one or multiple independent singleIphase series converters attached in another. The DPFC has similar functions to UPFC, providing the possibility of controlling parameters of transmission like line impedance, transmission angle and magnitude at bus voltage without a conventional DC link. FACTS technology is intrinsically associated with the evolution of smart grid infrastructure.

Simulink Waveforms & Power Quality Findings

play a crucial role in intelligent grid operation by enabling dynamic control of power flow, voltage stability, and reactive power compensation. In present era, real-time solutions for voltage regulation 1 , power oscillation damping, and congestion management are increasingly being implemented deploying devices such as STATCOM, SVC (Static Var Compensator) and UPFC.

Scope & Practical Applications

• High-efficiency DC-DC converters and isolated resonant topologies (LLC / DAB)
• Sinusoidal and Space Vector PWM inverters for grid integration & industrial motor drives
• MOSFET / IGBT gate driver optimization with active Miller-clamp shoot-through protection
• Power quality conditioning with Total Harmonic Distortion (THD) strictly compliant with IEEE 519
• Complete Simscape .SLX model files, parameter calculation scripts, and IEEE dissertation reports