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An improved artificial fish swarm algorithm with selection behavior was put forward in this paper and applied to optimize the PID gains of hydraulic turbine generator speed governor. The ITAE criterion of hydraulic turbine generator speed relative errors was taken as the fitness function of the improved artificial fish swarm algorithm. The computer simulation was conduct on an actual hydropower plant...
In this paper, an extended-L (EL) index is considered as a voltage stability constraint in optimal power flow (OPF) which guarantees adequate voltage stability margin (VSM) for an electricity market solution. The EL-index uses a generator equivalent model (GEM) that has significant effect on voltage stability studies. Two important objective functions which are maximization of the social welfare and...
The disjoint feasible zones make the economic dispatch problem non-convex. The existed solving schemes either rely on random searching, or use additional auxiliary variables, or involve high nonlinearity. In this paper, a new method is presented to overcome the main drawbacks in existed schemes. Due to its simple structure, the proposed approach also has the advantage to expedite the implementation.
Multi-period optimal power flow (OPF) is a basic tool to achieve optimal operation of a power system with energy storages devices and renewable sources. A novel convex relaxation based decomposeition algorithm is proposed in this paper to solve the full AC multi-period OPF with energy storages and renewable sources. Based on alternating direction method of multipliers (ADMM), the original time-correlated...
This paper presents a novel multi-chaotic framework, which is used for the parent selection process in Success-History based Adaptive Differential Evolution (SHADE) algorithm. Created variant of the Differential Evolution (DE) algorithm was named MC-SHADE and its performance is tested on the CEC2014 benchmark set in order to participate in the CEC2016 competition on bound constrained single objective...
This paper presents a new dynamic and stochastic decision supporting model for distributed generation investment planning (DGIP). The model is formulated as a mixed integer linear programming (MILP) optimization problem that simultaneously minimizes emission, operation and maintenance, as well as reliability costs. One of the salient features of the model is that it is based on a two-period planning...
In this paper, we evaluate potential location alternatives to identify a suitable commercial location to install a franchise coffee shop, using the franchise's requirements as decision criteria. The decision process is stated as a group multicriteria ranking problem (since there are multiple members or decision makers). We use a group decision-aiding procedure strongly based on the ELECTRE methodology,...
The Firm energy of generation plants is a critical component in some electricity markets. It is usually calculated by the regulator and sets a cap to the amount a plant can trade in capacity markets (or auctions), in order to avoid free-riding behaviors. Firm energy is a systemic property and, in case of hydro plants, a synergy is observed whenever a cooperative operation occurs, i.e., the firm energy...
This paper proposes a new approach for finding the minimum number of post-contingency corrections to relieve overload. The security-constrained optimal power flow (SCOPF) problem with AC power flow constraints can be formulated as mixed integer nonlinear programming (MINLP), which is an NP-hard problem. A two-stage approach—screening and detailed analysis—is utilized to solve the non-convex MINLP...
Ultra-wideband (UWB) pulse generators based on an avalanche transistor are widely used in time domain ground penetrating radar(GPR). For shallow subsurface detection, it is essential to increase the pulse amplitude while maintaining the pulse width in order to improve the spatial resolution of GPR. Eliminating pulse trailing is also necessary to improve GPR performance. In this paper, a simple nanosecond...
Electrification of rural households is of key importance for Africa's economic growth, particularly for developing countries such as Botswana. This paper carries out a techno-economic feasibility study of a solar biomass hybrid system with and without energy storage to supply load demand. The case studies were performed using HOMER software, choosing Phakalane, a village of Botswana as a location...
The article describes the problem of operation and control of the electronic generators as a part of multi apparatus systems of high-power ultrasonic action. It is shown the possibility of modernization of the standard constructional circuit of the electronic generator, it is analyzed the possibilities of the electronic generator developed for the ultrasonic apparatus of “Bulava-P” series. The methodology...
This paper deals with introducing new ex-ante indices of market power which measure potential of each generator in exercising market power. These indices consider competitors' offer price as an important factor affecting incentive of generator to exercise market power. In deregulated electricity market, there exists two strategies adopted by generators to exercise market power which are separated...
This paper presents an efficient memory-based fast Fourier transform processor including 35 different working sizes for LTE systems. A factorization method named high-radix-small-butterfly combined with a conflict-free address scheme for 2p3q5r point memory-based FFT processor is proposed. The processor can not only provide conflict-free concurrent data access from different memory banks but also...
In this contribution we will discuss the digital, hence scalable, version of memcomputing machines. These are non-Turing machines that use memory to both process and store information at the same physical location. We will introduce their mathematical definition and provide as an example their implementation of an inverse three-bit sum gate using self-organizable logic gates, namely gates that organize...
In recent years the European policies on sustainability, market integration, competition and renewable energy resulted in a higher loading of the transmission system. As the power system is being operated much closer to its limits, an unforeseen sequence of events can cause the power system to deteriorate very fast from normal state to the alert or emergency state. Simultaneously the number of power...
Increasing consumer choices and market options in the power market necessitate a more resilient grid operation. Security level indication based on the desired risk index and thus a risk-based security constrained optimal power flow is described and simulated in this paper. It highlights the possibility of giving a choice of security level to a consumer area and also presents the computation of risk...
In short-circuit studies, phase shifts in transformers (e.g., connected in wye-delta or vice versa) make difficult to calculate fault current flowing in sequence-component networks. Therefore, they are often ignored because the magnitude of fault current is much more of interest than phase angles from the protection point of view (e.g., overcurrent relays). As high-capacity distributed generation...
In the article we research the means for fault detection system set up for NGV-refuelling stations compressor equipment. It is a real-time diagnostics while operation. Equipment technical state is estimated in accordance with vibration index analysis. The fault detection system helps to vary frequency till fifteen harmonic components of generated signal and vibration acceleration and gives opportunity...
Stochastic circuits provide very high efficiency in terms of gate area and power consumption compared with conventional binary logic. However, they require random bit streams generated by stochastic number generators (SNGs), which account for a significant portion of area and energy offsetting their merits. In this paper, we propose a new SNG that significantly reduces area and energy while improving...
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