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Currently, Russian power sector has switched to the market model for controlling electric power industry functioning and development. Due to a need to consider numerous specific features characteristic of the market-based industry, modern criteria for designing electric networks should obviously differ from the criteria of “planned economy” approach. The paper considers new method for long-term transmission...
In the changing electricity power supply chain, demand response from buildings is a crucial control resource. Whereas numerous studies exist on peak load reduction activities using buildings, few represent building side perspectives. The result is oversimplification of analyses and a near silence on building side considerations. This study uses the building centred productiveness concept to analyse...
This paper presents a dynamic programming method to build the optimal energy management for an island microgrid which comprises the PV system, diesel and battery energy storage system (BESS). The objective is to minimize the operation cost and to reduce emissions by scheduling distribution energy resources (DER) in microgrid. The constraints are given by the power balance between the production and...
When assessing the lightning performance of distribution lines, major attention is in general devoted to the induced voltages from nearby strikes rather than to direct events hitting the line, as the latter are always expected to cause a fault in the line. This paper proposes a Monte Carlo procedure capable to make it possible the evaluation of the overvoltage probability due to both indirect and...
This paper investigates different control implementations for the frequency-response coupling between synchronous areas that feature a decentralized load-frequency control structure. The technical basics are presented, along with a 2-area benchmark system implemented in SIMULINK. Two new concepts are applied: Frequency-response delivery and frequency netting. The results show that both concepts are...
Demand side response (DSR) has gained significant interest due to the time-varying and uncertain nature of renewable energy, and the challenges associated with integrating renewable technologies into power systems. DSR is considered as a fundamental component of the emerging smart grid paradigm and is seen as a potential means to achieve higher renewable targets across the globe. It is, therefore,...
Large Offshore wind farms are planned in China and some are under constructions. DC grid or multi-terminal HVDC is the promising technology to delivery large offshore wind power over long distances. DC grid voltage levels need to be built to design optimal DC grid, without this voltage levels, DC grid may be sub-optimal, not cost-effective. This paper proposes the study framework of building voltage...
One of the main challenges with HVDC multi-terminal (MTDC) configurations, which are based on voltage source converters (VSC), is the protection system. The dc grids have small series inductances which made them unable to limit the rise time of the DC current when a dc fault occurs. For this reason, the dc fault clearing must be performed very fast in order to limit the effect of the rapid increase...
Increasing complexity and uncertainty of power system operation have led to a rising interest in decentralized control concepts as a complement or alternative to centralized control. For decision-making on appropriate control actions, such approaches need to perform analyses of the system state and the estimated impact of control actions basing on limited system information. Thus, it has to be ensured...
The paper proposes a hybrid methodology based on a Gaussian local search and a genetic algorithms to address the multi-objective and multistage optimal distribution expansion planning problem. The methodology is applied to solve the problem of optimal network investment under the new possibilities enabled by the smart grid, namely the new observability and controllability investments that will be...
The widespread use of Combined Heat and Power (CHP) units, micro-CHP, gas boilers and heat pumps is more and more increasing the linkages between electricity, heat and gas networks. This is particularly true at the district level, where the vision of having smarter cities is calling for new models that are capable to assess in an integrated fashion the downsides and upsides of the tighter interactions...
This paper examines the value of load shifting (LS) and its impact on the scheduling and operation of large insular power systems which are typically characterized by high electricity generation cost and often by high Renewable Energy Resources (RES) share in the generation mix. An optimization model for the integration of load shifting in the unit commitment problem is presented and consecutive daily...
This paper presents a method which enables the identification of critical power system states regarding voltage stability. The identification is based on a Continuation Power Flow (CPF) Method, starting at a given operating point to find next collapse points under given system constraints. In particular different load characteristics, generator limits and the operating of tap changers are considered...
This paper presents the first results of the project “Optimization of fuel cell CHP systems as a component for future building energy supply in smart cities” at Bielefeld University of Applied Sciences. Main focus on modeling and simulating a fuel cell-based micro-CHP-system and scrutinizing electrical and thermal driven operating modes.
The adoption of Electric Heat Pumps (EHPs) at residential level can support the decarbonization of domestic heating. However, these new loads can produce technical problems in low voltage (LV) distribution networks. This work studies the EHP technical impacts in LV feeders, analyzing potential actions to minimize them. Particularly, two cases are investigated: the utilization of different heat emitters...
To tackle the air pollution issues, Plug-in Hybrid Electric Vehicles (PHEVs) are proposed as an appropriate solution. Charging a large amount of PHEV batteries, if not controlled, would have negative impacts on the distribution system. The control process of charging of these vehicles can be centralized in parking lots that may provide a chance for better coordination than the individual charging...
Due to the stochastic nature, there are several concerns on the effectiveness and robustness of evolutionary algorithms when applied to solve different kinds of optimization problems in power systems field. To address this issue, this paper provides a comparative analysis of several evolutionary algorithms based on parametric and non-parametric statistical tests. Numerical examples are based on hydrothermal...
This paper proposes algorithms for optimal siting and sizing of Energy Storage System (ESS) for the operation planning of power systems with large scale wind power integration. The ESS in this study aims to mitigate the wind power fluctuations during the interval between two rolling Economic Dispatches (EDs) in order to maintain generation-load balance. The charging and discharging of ESS is optimized...
This paper presents a two-step approach for defining coherent generators in disturbed power systems based on the similarity among their inter-area oscillations and swing curves. In the first step, an online visualization of the generator swing curves is performed by extracting time domain solutions of the swing equation using PMU measurements. In the second step, the similarity between each pair of...
Widespread interconnection of Photovoltaic (PV) systems in the distribution system may create voltage rise problem. In this paper, a decentralized voltage control method by use of voltage regulators (VRs) and demand side management using consumer controllable load has been proposed for voltage rise compensation. The proposed method includes a novel determination method to find dynamic line drop compensation...
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