Seven Level Voltage Source Converter Based Static Synchronous Compensator with a Constant DC-Link Voltage

L Narayana Gadupudi,Fausto Pedro García Márquez,Ramesh Devarapalli,Gudapati Sambasiva Rao

doi:10.3390/app11167330

L Narayana Gadupudi, Fausto Pedro García Márquez + Show 2 more

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https://doi.org/10.3390/app11167330

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Abstract

Flexible alternating current transmission system (FACTS) controllers are important to enhance the quality of power in power systems. The stability of a system is achieved via a FACTS device (a Static Synchronous Compensator (STATCOM)). This paper aims to control the losses in the transmission system during peak energy demand circumstances with minimal losses in the economical and functional efficiency of the system. The STATCOM operation of a seven level voltage source converter (VSC) with binary-weighted transformers is proposed for controlling the reactive power variations and terminal voltage changes at dynamic circumstances in the transmission system. The STATCOM is operated at 132 kV and is a 50 Hz AC system with a single DC-Link capacitance and two VSC power circuits. Each VSC circuit consists of three H-bridges with specific switching angle control in order to achieve low total harmonic distortion at the fundamental frequency. The coupled control circuit phenomenon is imperative for computing the switching angle for a stable performance. The dynamic functional improvement efficiency is harvested with a minimum number of switches and transformers used in high voltage and high-power applications. The number of switches, transformers, and capacitors for 132 kV are optimized with a proposed STATCOM operation in seven level VSC with binary-weighted transformers. The simulated results prove that the proposed model significantly improved system performance and stability.

Highlights

The role that flexible alternating current transmission system (FACTS) devices play in peak voltages and at high-power applications is significant to achieving reactive power variations and sustaining a system voltage profile
The dynamic load progress of STATCOM was estimated with reactive power changes at a nominal point ‘Q∗S’, and the terminal voltage changes at nominal point ‘v∗t ’; quadrature current ‘I1∗q’ was evaluated for stable operation of the system with minimum harmonic distortion
The STATCOM performance was observed during this time period and the reactive power flows to the STATCOM side, the AC output voltage and DC-Link voltage were adopted to the voltage losses

Summary

Introduction

The role that flexible alternating current transmission system (FACTS) devices play in peak voltages and at high-power applications is significant to achieving reactive power variations and sustaining a system voltage profile. A FACTS device (the static synchronous compensator (STATCOM)) is being used to control the losses in terms of reactive power variations and terminal voltage changes in the system. The STATCOM FACTS device is being used to control losses in terms of reactive power variation and terminal voltage changes in the system [5,6,7]. The bulk power rating of the high voltage direct current power transmission system’s performance is estimated via modular level converters with mean value and equivalent versions of submodule circuits [20]. The series-parallel device combinations of hybrid switched multilevel converters, which are designed and implemented for high voltage as well as high power applications with improved performance [22].

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