STATCOM systems in distribution and transmission system applications: a review of power-stage topologies and control methods

Summary Recently, both utilities and consumers have paid great attention to voltage fluctuation (flicker) problem, which is defined as low‐frequency fluctuation on the base signal of voltage. For mitigating the flicker, identification of its source is the first step. In this paper, a new method is proposed for identifying the location of flicker sources in a multi‐flicker sources power network in a more reliable and precise manner by a minimum number of monitoring points. This method is based on the wavelet transform (WT), the approximate model of the line and flicker power theory. In addition, in this method, a new factor is proposed for determining the contributions of individual consumers and utility providers in the global flicker level of a common coupling bus‐bar. For validating the performance of the proposed method, comprehensive simulations have been performed in MATLAB environment on a single‐ and multi‐flicker sources system based on IEEE 34 node test feeder. As proved by the results, the proposed method is able to identify the contributions and locations of flicker sources with higher reliability and accuracy compared with other methods.

Section: Introductionmentioning

confidence: 99%

A new method with minimum number of monitoring points for flicker source tracing by wavelet transform

Banaem

Abbasi

Tousi

2019

“…Multilevel inverter topologies play an important role for medium‐voltage, medium‐, and high‐power level power system applications, such as static compensators (STATCOM), active shunt filter, and renewable energy integration to grid . It has some promising features such as lower harmonic distortion, lesser dv/dt voltage stresses on power semiconductor devices, requires lower voltage rating devices, high power handling capability, lower switching losses, higher conversion efficiency, producing smaller common mode voltage, and lesser electromagnetic interference (EMI) .…”

Section: Introductionmentioning

confidence: 99%

An improved SHM‐PWM scheme for three‐phase seven‐level CHB inverter to improve power quality by fulfilling CIGRE WG 36‐05 and EN 50160 and sharing equal power between the H‐bridge cells

Kundu

Banerjee

2019

Summary This paper presents an improved selective harmonic minimization (SHM)‐pulse width modulation (PWM) scheme using three‐phase seven‐level cascaded H‐bridge (CHB) inverter suitable for medium‐voltage distribution systems by achieving high‐quality voltage waveform with least number of switching instances (ie, each power semiconductor devices switched once in a quarter period). Here, each isolated DC voltage sources have been taken as variable and unequal for the CHB inverter. The efficacy of the proposed SHM‐PWM scheme over selective harmonic elimination (SHE)‐PWM scheme and existing SHM‐PWM scheme has been verified through a comparative inverter performance analysis with equal number of switching instances. Both simulation and experimental results prove that the proposed SHM‐PWM scheme ensures equal percentage of power‐sharing between the H‐bridge cells, achieves desired fundamental voltage component, minimizes each individual odd nontriplen harmonics, and limits %total harmonic distortion (THD) up to 25th‐order harmonics such that, it satisfies the power quality standards CIGRE WG 36‐05 and EN 50160 for the entire modulation index range. It is also seen that the proposed scheme requires least no of switching (three) than other reported SHE‐/SHM‐PWM schemes to meet the aforesaid power quality standards. It also results lower inverter losses and improves efficiency compared with conventional schemes. Finally, the scheme is applied to a closed‐loop control of induction motor driven by back‐to‐back PWM‐controlled converter.

“…STATCOM as a comprehensive compensator was suggested for microgrids . It was shown that the UPFC and STATCOM are better choices for reactive power and voltage in typical IHPS . Application of the model predictive control approach for voltage stability in an isolated hybrid wind‐diesel generation system based on reactive power control was studied in Kassem and Abdelaziz .…”

Section: Introductionmentioning

confidence: 99%

Robust distributed control of reactive power in a hybrid wind‐diesel power system with STATCOM

Raouf

Akbarimajd

Dejamkhooy

et al. 2018

Summary Distributed generation is an interesting way to provide electricity, especially for areas that are far from the electrical grid. Because of the unpredictable nature of renewable sources, centralized control schemes are not reliable. In this paper, a robust distributed controller was designed for an isolated hybrid power system (IHPS) with a static synchronous compensator. To this end, a multi‐unit hybrid wind‐diesel system was investigated. Kharitonov's theorem was used for designing robust PI controller parameters of the IHPS. Moreover, the system stability analysis was conducted by Kharitonov polynomials according to the zero inclusion principle, Hurwitz matrix stability examination, and Mikhail's criterion. By suggesting and accomplishing several scenarios, the performance and robustness of the proposed controller were inspected under different disturbances. For the purpose of ability comparison, the pure PI and fuzzy‐PI controllers tuned by the GWO algorithm were applied. Simulation results showed that dynamic responses of the power system were improved by the proposed controller. Furthermore, the results emphasized that the proposed Kharitonov's theorem‐based controller was robust against large disturbances.