Mohammad Farshad

Gonbad Kavous University | GPNU · Department of Electrical Engineering

In this paper, some useful features are extracted from voltage signals measured at one terminal of the transmission line, which are highly efficient for accurate fault locating. These features are the amplitude of harmonic components, which are extracted after fault inception through applying discrete Fourier transform on one cycle of three-phase v...

In this paper, a method for fault locating in HVDC transmission lines is proposed which only uses the voltage signal measured at one of the line terminals. The postfault voltage signal, in a relatively short-time window, is considered and the corresponding fault location is estimated based on the similarity of the captured voltage signal to existin...

One of the major challenges in half-bridge modular multilevel converter-based high-voltage dc (MMC-HVDC) grids is the rapid detection and isolation of short-circuit faults before converter blocking and the entire grid shutdown. With the advancement of the hybrid dc circuit breakers (HDCCBs) in the ultra-fast isolation of faults, a considerable part...

A novel fault-location scheme is designed for transmission lines of high-voltage dc (HVdc) grids equipped with quick-action protections and circuit breakers using very few milliseconds of postfault signals, measurable before the ultrafast fault-isolation stage. A simplified equivalent circuit analysis shows that the first negative overshoot time an...

This article presents a new systematic technique for identifying voltage traveling waves (TWs) to determine the location of line faults in half-bridge modular multilevel converter-based high-voltage dc (HBMMC-HVdc) grids. In this technique, the buffered voltage signal frame around the fault-detection time is first scaled and then segmented via an o...

When the voltage and current signals measured in ac power systems are highly distorted due to high penetration of nonlinear loads and power electronics converters (e.g., in microgrids) and measurement noise, the traditional methods of frequency calculation will be associated with a significant error. This article introduces a novel power frequency...

This article presents a new passive islanding detection technique in MGs that uses locally measured voltage signals at the PoC of DERs. The proposed method distinguishes islanding events from normal/non-islanding conditions by utilizing superimposed harmonic spectra extracted through a full-cycle discrete Fourier transform. Our solution utilizes a...

With the widening application of high-voltage direct-current (HVDC) systems, related issues such as their protection requirements have attracted much attention. Indeed, the various technologies employed in HVDC systems have their particular complexities and protection challenges. Therefore, it is essential to design appropriate fault detection, cla...

Short-circuit fault detection and classification in high-voltage direct-current (HVDC) electric power transmission lines are necessary for rapid location and removal of faults, as well as for recovering all or part of the power transmission capacity. In this study, a new and efficient technique is designed for protecting current-source converter-ba...

This article proposes a new passive islanding detection technique for inverter-based distributed generation (DG) in microgrids based on local synchrophasor measurements. The proposed method utilizes the voltage and current phasors measured at the DG connection point (point of connection, PoC). In this paper, the rate of change of voltages and the r...

Independent investors can install distributed generations (DGs) in power networks as long as they follow the systems’ rules and frameworks. Logically, they try to maximize their profits, and network owners/operators usually cannot directly control their decisions regarding the DG location and size. However, there are inherent interactions between t...

Half-bridge modular multilevel converter-based high-voltage direct-current (MMC-HVDC) grids are technically and economically viable solutions to transmit bulk electrical energy generated from geographically dispersed and remote renewable resources. However, due to the half-bridge converter's inability to control fault currents, these grids need spe...

Developments in power systems like the installation of new generation resources and interconnections may increase short-circuit current levels and consequently, impose additional costs of replacing circuit breakers and equipment. In these cases, one of the best methods to reduce short-circuit currents in power systems and avoid significant replacem...

The performance of photovoltaic (PV) systems is highly dependent on environmental conditions. Due to probable changes in environmental conditions, the real-time control of PV systems is essential for exploiting their maximum possible power. This paper proposes a new method to track the maximum power point of PV systems using the moth-flame optimiza...

This paper proposes a novel protection scheme for detection and classification of internal faults in bipolar HVDC transmission lines using the K-means data description (KMDD) method. In the proposed protection scheme, the inverter-side dc voltage and current signals are utilized. Relatively short-time windows are considered for these signals, and t...

In this paper, a novel fault‐location method is presented for high‐voltage direct current (HVDC) transmission lines based on the pattern recognition techniques and the machine learning strategies. In the proposed method, the voltage signal at one of the HVDC stations is stepped down via a resistive‐capacitive voltage divider (RCVD) and passed throu...

High voltage direct current (HVDC) transmission lines can be used to transfer bulk power over long distances. Accurate estimation of fault location in these transmission lines is very essential to speed up the maintenance operations. This paper presents a new approach for intelligent fault locating in bipolar HVDC transmission lines using the patte...

Analysis of players behavior and electricity markets conditions through simulation can assist market decision-makers in appropriate designing and policy-making before actual implementation and can reduce costs and possible future problems. Considering ancillary service markets in addition to the energy market in simulations makes possible to compar...

In the restructured environment of the power industry, various commodities such as energy and operating reserves may be provided through simultaneous auctions. Prediction of market players' behavior in the auctions and simulation of the markets' environment can assist market decision-makers in evaluating specific policies before enforcing them in t...

In this paper, an accurate method is presented for fault locating in transmission lines by using a simple instance-based learning algorithm. Features of patterns are adopted on the basis of harmonic spectra extracted by applying the S-transform on only voltage signals measured at one terminal of line. Due to distinct spectral patterns of transients...

Context: Intelligent fault locating in transmission lines consists of three main steps: feature extraction, feature selection, and utilizing a learning tool. Objective: The main objective of this paper is to propose a systematic approach for intelligent fault locating in transmission lines. Method: This paper extracts a group of candidate features...

In this paper, an approach is proposed for accurate locating of single phase faults in transmission lines using voltage signals measured at one-end. In this method, harmonic components of the voltage signals are extracted through Discrete Fourier Transform (DFT) and are normalized by a transformation. The proposed fault locator, which is designed b...

This paper presents a novel method based on machine learning strategies for fault locating in high voltage direct current (HVDC) transmission lines. In the proposed fault-location method, only post-fault voltage signals measured at one terminal are used for feature extraction. In this paper, due to high dimension of input feature vectors, two diffe...

This paper presents a novel solution method for joint energy and Spinning Reserve (SR) dispatch problem. In systems in which the Lost Opportunity Cost (LOC) should be paid to generators, if the LOC is not considered in the dispatch problem, the results may differ from the truly optimum solution. Since the LOC is a non-differentiable function, inclu...

In power systems, distance relays are utilized widely as main protection of the high voltage transmission lines, and their safe operation has significant effects on health of the components and stability of the system. Power swing is a phenomenon that can cause mal-operation of the distance relays while there is no fault in the system. In this pape...

Encourage people to investment in small-scale electricity generation and expansion of dispersed generation (DG) may have several advantages such as, reducing the needs for investment in power plants and transmission network developments, improving the competitiveness of electricity market and moderating the costs of electrical energy procurement. I...

Providing electrical energy is one of the main concerns when constructing a new building for business, agricultural, or residential purposes in remote areas. On these occasions, an economic analysis should be done to make an appropriate decision for providing electrical energy to these areas. In this paper, an approach is proposed for economic eval...

In the competitive environment of the power industry, analysis of interactions among different markets is useful for market policy-makers to gain access to desirable designs and rules. In this article, the energy and spinning reserve markets are considered as an integrated structure, and a novel index called the interaction factor is introduced to...