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We aim to solve the OPF problem by defining contingency scenarios involved in the optimization problem by means of a SDP relaxation. Contingency scenarios are performed for the IEEE 39-bus system. Contingency analyses are performed by generation and line losses. Contingency scenarios are considered to be possible events. These events may be single contingencies, such as a generation unit failures...
Cibatu34-Mandirancan is one of the most important subsystem in Jawa Bali system. Peak Load of this subsystem is about 1.700 MW, several industrial costumers are also located here. On 13th March 2014 disturbance occured on Indramayu-Kosambibaru. This disturbance was followed by tripping of two transmission lines and all generators in Indramayu Power Plant. Disturbance Fault Recorder (DFR) data showed...
In this paper simulation studies have been conducted using Simulink/MATLAB software in order to investigate the impact of STATCOM on the positive-offset mho element loss of excitation (LOE) protection scheme in synchronous generator. The obtained results show that the operation of the positive-offset protection scheme takes more time under the integration of STATCOM in the transmission line. Moreover,...
With the diversified development of electrical loads, and the large-scale integration of volatile renewable generations, power system operation, control and planning face the challenge of increasing injection uncertainties. In this paper, a new method for reference network considering nodal injection uncertainties is proposed. The actual operation mode optimization and reserve configuration of power...
Evaluation of relay misoperations provides an opportunity to improve the design of backup protection schemes. Existing generator station backup protection schemes use distance protection (21) or voltage controlled/restrained overcurrent protection (51V) elements for clearing phase faults that are not cleared by either line protection or generator protection. Many schemes also use transformer ground...
This paper examines resonant characteristics of the transmission line compensated with the Static Synchronous Series Compensator. Frequency-domain characteristics of the line impedance are studied to evaluate whether the SSSC can cause electrical resonance in the line, hence the potential to excite subsynchronous resonance (SSR) in neighboring turbine-generator plants. Detailed studies are performed...
In order to make better use of the existing transmission system, different approaches can be adopted. Previous research shows that both topology control and flexible AC transmission systems (FACTS) can enhance the transfer capability over the existing transmission network and reduce congestion costs. In previous studies, potential cost savings from performing line switching and utilizing FACTS control...
This paper presents a fully-distributed DC optimal power flow (DCOPF) method that incorporates flexible transmission, and studies the impacts of communication limitations on the convergence properties of the proposed method. The distributed DCOPF algorithm iteratively solves the first order optimality conditions at each bus. To converge to the globally optimal solution, some information is communicated...
Unpredictable accidents and uncertain environment make the management of the power systems difficult, which may increase the cost of power generation. In this paper, we apply a stochastic model predictive control to maintain the demand-and-supply balance in the IEEE 30-bus system and analyze how much a transmission line fault with uncertain weather forecast raises the generation costs. Since the temperatures...
This paper discuss about effect of traction substation for high speed railway in Indonesia. The purpose of this paper is to obtain magnitude of voltage and current unbalance due to traction substation that perceived by system and generator adjacent to traction substation. Analysis is performed by doing simulation of 5 scenarios in simple system model that created in power system simulation program...
In this paper, a competitive bidding based congestion management strategy is developed for a pool type electricity market model. The proposed congestion management strategy alleviates the transmission congestion by using rescheduling both the real and reactive power output of generators. The separate bids for real and reactive powers are invited from all participating generators in the congestion...
Cascading failures occur when the power system is subject to a significant disturbance, such as tripping one or more transmission lines. Such failures can severely impact power system stability, potentially leading to widespread outages. One proposed approach for mitigating cascading failures is to partition the system into internally stable islands (a process known as controlled islanding). Selecting...
This paper investigates the influencing factors and mechanism of sub-synchronous resonance (SSR) phenomenon in the doubly fed induction generator (DFIG) based wind turbines to a series compensated transmission system. First, a model of DFIG-based wind power unit interconnected with series compensated networks is developed to analyze the mechanism of induction generator effect (IGE) and sub-synchronous...
A square wave transmission based micro-grid, which is compatible with commercial AC sinusoidal grid components, is investigated in this paper for rural areas. The basic interface circuit unit, square wave generator (SWG) is designed to satisfy bidirectional power flow and square wave transfer. The square wave has larger power delivery compared to sine wave. The circulating current of paralleled SWGs...
An Intentional Controlled Islanding (ICI) algorithm based on an exact Mixed Integer Programming Formulation (MILP) was previously proposed and tested using IEEE test systems. The proposed algorithm directly determines an islanding solution with minimal power-flow disruption for any given number of islands, while ensuring that each island contains only coherent generators. However, since one or more...
In this paper, the input signals and the control model structure of the HVDC link POD control are studied. First, a benchmark is proposed to investigate the input signal selection of the POD controller. Next, by considering different situations, it is shown, based on the residues criteria, that the choice of the input signal depends on the parameters of the system. More precisely, the numerical results...
Power system restoration continues to be a major challenge for many power systems in sub-Saharan Africa. Hydropower generation also remains as one of the major sources of power in this region. However, many power systems supported by hydropower generation in this region suffer from frequent power system blackouts, which have detrimental implications on the power system and its users. This paper focuses...
Study on use of UFLS scheme in the prevention of voltage collapse on Nigerian 330 kV network. The network was modelled using PSS/E. Three simulation cases were considered: case one determined the network convergence status, case two considered AC contingency study to see the network weak points and case three dealt with the situation of voltage collapse as occurred on the grid on 27th May, 2013 and...
This paper discusses GRIDCo's generator connection procedures and requirements. It provides adequate guidance to the prospective generator connection applicant proposing to connect its generator to the National Interconnected Transmission System (NITS) and allay uncertainties in the connection process. Typical means of connecting generating facilities to the NITS have been illustrated. Identification...
For pursuing the high speed information transmission, the design and research of the high speed SerDes circuit are actively developing now. Due to the requirements for long transmission path, intensive equalization and high speed transmission circuit testing function, two high speed SerDes circuits are designed and fabricated based on 130nm SiGe BiCMOS technology. One is for the research of the equalization...
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