Model Of Power Supply System Research Articles

Modeling and research of power supply systems with renewable energy sources and hydrogen fuel cells

Currently, the creation of environmentally friendly energy systems, including only renewable energy sources, is an urgent task. In this paper, such an autonomous power supply system (microgrid) for isolated consumers is investigated. It includes photovoltaic converters, wind turbines, an electrolyzer, fuel cells, electrical energy and hydrogen storage. For its study, an original optimization mathematical model was used. The optimal structure of the system and its operation modes are determined according to the criterion of minimum total discounted costs, taking into account energy balances and a number of additional conditions and constrains. It is shown that the use of energy sources of various types and energy storage devices makes it possible to smooth out the uneven generation of solar and wind power plants. It has been established that it is expedient to use electric batteries for short-term, and hydrogen accumulators – for long-term energy storage.

INFORMATION TECHNOLOGIES FOR STUDYING PARAMETERS FOR SIMULATING COMPLEX SCHEMES OF ELECTRICAL SUPPLY OF ELECTRICAL TRANSPORT TRACTION NETWORKS

The parameters of complex power supply schemes of tram lines, which are required for simulation modeling, were studied: statistical characteristics of traction loads of feeders and voltage on the tires of traction substations. It was established that the distribution function of the feeder feeding the tram depot corresponds to the logarithmic normal law, the distribution function of the modules of the idle voltage deviation and the angles between the idle voltages of adjacent traction substations to the truncated normal law. It is proposed to modernize the information bases of electric traction network parameters with complex power schemes to increase the efficiency of modeling the modes of operation of sections of urban electric transport. A method of calculating instantaneous schemes has been developed, which allows to create algorithms that do not depend on the degree of complexity of the scheme. A method of simulation modeling of complex power supply systems of electric transport based on the synthesis of the matrix method of calculating instantaneous circuits and the method of statistical tests for modeling the organization of traffic of trams and trolleybuses is proposed. Algorithms and simulation models of traction power supply systems of urban electric transport have been developed, taking into account the modes of operation of power systems. A single simulation complex has been created that takes into account the traffic schedules of trams and trolleybuses, power flows in power supply systems, which makes it possible to obtain generalized dependences of power flows and energy losses, and to increase the accuracy of calculations of electrical parameters to 5–7%. Adequacy of the simulation model to the real process was verified by experimental data on a number of two-track, single-track sections of electric traction networks and complex power supply schemes of traction substations. The error in determining the integral indicators of costs and energy losses does not exceed 5%, and the rms currents – 3%. The use of simulation modeling in the design of traction power supply systems allows to improve the quality of electrical engineering calculations of complex power supply schemes and to propose energy-efficient power supply modes.

Modeling and Simulation of Traction Power Supply System for High-Speed Maglev Train

The electromagnetic suspension high-speed maglev train system uses long-stator linear synchronous motors (LLSMs) as levitation and traction mechanisms. In this paper, the modeling and simulation of the traction power supply system for the maglev train are performed. The simulation models include transformers, converters, variable-length cables and LLSMs of both two sides and two ends; meanwhile, the corresponding control and segmented power supply strategies, including the two-step method and three-step method, are implemented. Based on the system model, the operational performance of the high-speed maglev power supply control system is verified, and the fault performances under open circuit and short circuit are also analyzed. The whole simulation modeling and results have important reference significance for the research of high-speed maglev technology.

Improvement of the electric energy quality in underground electric networks in highly productive coal mines

One of the main factors for the effective functioning of the power supply system in highly productive coal mines is the uninterrupted power supply of underground consumers for the entire process cycle at sufficient amount of electric energy at a high level of quality and performance. The analysis of electric energy consumption in highly productive coal mine has shown that about 57 % of electric energy consumers are located in underground workings. Consumers can be divided into the following areas of basic technological process of coal production: production areas (13 %); conveyor transport areas (13 %); preparation areas (8 %), and areas of auxiliary processes of coal production: mine drainage (23 %). The increase in the share of controlled-velocity electric drives in the total power balance of fully-mechanized longwalls leads to factors previously atypical of underground power networks. Such factors include changes to the harmonic composition of the network, arising higher current and voltage harmonics, affecting the supplying network and causing heating of electrical equipment, power and electric energy losses. Therefore, the most pressing issues are to improve electric energy quality in underground electric networks of highly productive coal mines. The study has developed a technique for experimental investigations of quality indicators of electric energy (presented in the form of algorithm) in respect to specific conditions of highly productive coal mines. These include dangerous facilities in terms of sudden gas/dust outbursts. This technique was tested at a number of coal mines of JSC SUEK-Kuzbass. The study also presents the results of experimental investigations to determine the actual level of total harmonic distortion (factor) in underground electric networks of fully-mechanized longwalls of coal mines. Of greater importance is justification of higher harmonic filter parameters. To this end a calculation algorithm based on the developed technique has been proposed. Research has shown that application of forward and inverse Clarke transformations for calculating the harmonic filter parameters is applicable for all voltage levels. The simulation model of power supply system of a coal mine fully-mechanized longwall allows conditions of higher harmonics damping to be studied by means of a device for improvement of electric energy quality. Applying the proposed technical solutions to improve the quality of electric energy based on the simulation modeling allowed the successful damping of higher harmonics to be achieved. For example, the total harmonic components voltage (THD (U)) was reduced from 9.07 to 1.77 %.

Моделирование переменных параметров работы дуговой сталеплавильной печи

Approaches to modeling arc steel furnaces are considered. As a result of the analysis of various approaches, a model with variable parameters R and XL was selected, which allows considering an arc furnace as a variable load with a corresponding effect on the supply networks. The resulting model is intended for inclusion in the general model of the furnace power supply system with a static var compensator and has practical application for setting up the control system of the compensating device.

Development of the system of coordinated control of traction power supply equipment and electric rolling stock

The aim of the study is to develop a system of coordinated control of traction power supply equipment and electric rolling stock based on self-organization principles. The research methods of the study are based on multi-agent approach and include coordination of settings of static equipment of reactive power compensation, on-load tap changing of traction transformers, other voltage regulators in the contact network, microprocessor protections, modes of operation of electric locomotives in the interstation area. The obtained results made it possible to substantiate the model of self-organizing control system of traction power supply equipment and electric rolling stock, including the description of interaction and coordination principles, attributes, ontology, algorithms of the efficiency of local regulators of traction network and electric locomotives. The study presents the description of the information model of the traction power supply system and electric rolling stock to control modes and increase the throughput capacity of the power supply system by means of optimum allocation of traction resources. The results of the simulation modeling have confirmed the effectiveness of the proposed solutions.

Mode NASA blade used to calculate the power generator for (VAWT) by drag and lift coefficients

One of the confrontations with increasing demand on power in the entire world the methodologies of provided power divided into traditional methods against renewable methods. This article presents a simulation model to estimate the integrated power from vertical access wind turbine (VAWT) stages of development of a simulation model of local power supply system (LPSS) with (VAWT). However, wind power is one of the quickest developing advances for the sustainable power age. Disturbingly, in the ongoing years a few instances of corruption on telecommunication systems frameworks have emerged because of the presence of wind ranches, and costly and in fact complex restorative estimations needed. The grade of variation of power verified according to the grid size. The parameters were taken in the study through the preparation of the model are (efficiency, cost, and system response) compared to the benefits against disadvantages when combining the two systems to achieve a high performance of the power stability.

Research on the influence of electric railway bilateral power supply on power system and countermeasures

Bilateral power supply can improve the power supply capacity and extend the power supply distance in high-speed railway traction power supply system (TPSS). However, the balanced power generated after bilateral power supply hinders its widespread application. In order to reduce or eliminate the balanced power, in this paper, an equivalent model of the bilateral power supply system is established, and it is found that the balanced power is mainly affected by the phase deviation of the feeder voltage of the two adjacent traction substations. The influence of balanced power on the node voltage and power flow distribution of the power system is analyzed with the IEEE 14-bus test system, and then a new voltage phase shifter suitable for TPSS is proposed to reduce the balanced power. The simulation and case study show that the proposed phase shifter can effectively adjust the phase difference and significantly reduce the balanced power, which lays a foundation for the implementation of bilateral power supply in electrified railway.

Assessment of influence of rolling mill FC-AR electric drive operation mode on 10kV supply network voltage quality

Advanced rolling mill electric drives are based on frequency converters (FC) with active rectifiers (AR). Operation of such converters has negative impact on the in-plant power supply system. To improve the voltage quality of active rectifiers, special algorithms of pulse-width modulation algorithms are used. As a rule, the study of the effect of electric drives with FC-AR on the supply network are carried out based on simplified mathematical models that do not consider possible resonance phenomena in the power supply system and operating mode of electric drives. Thus, the aim of the paper is to assess the acceptability of such an approach. The trends of the main parameters of the rolling mill electric drives have been recorded during the rolling cycle using the IBA PDA software. The obtained dependencies values have been approximated and applied in a complex simulation model of the in-plant power supply system. It considers the parameters of the supply network, cable lines, step-down transformers, rolling mill electric drives and other electrical receivers of the shop substations. The main assumption in simulation modeling is to consider the loads of other electrical receivers in the form of constant values. The authors have studied the effect of the operating modes of the rolling mill electric drive on the electric power quality in the 10 kV distribution network of the in-plant power supply system of a metallurgical enterprise. It is found that the total harmonic distortion KU at 10 kV sections of the main step-down substation of a metallurgical enterprise is changing in a nonlinear manner in the dynamic modes of acceleration and deceleration of electric drives. The nature of the coefficient KU also depends on the presence of resonance phenomena in the frequency response of the medium voltage supply network. The obtained results prove the need to consider the operating modes of electric drives when studying the influence of electric drives with FC-AR on the quality of the supply network voltage. in case we conduct experimental research using the equipment of the enterprises, as well as during theoretical research using mathematical models. The adequacy of the simulation model has previously been confirmed by experimental data and previous studies.

The efficiency of electric power supply with the transmission of peak loads to distributed generation

A model of a radial power supply system in MatLAB was compiled to perform the research. The transformer substation is represented by a step-down transformer, the load of the substations in the form of a resistance. Electricity is transmitted to the substations along three power transmission lines. The power center is represented by an ideal source. A reserve source of limited power is connected to the remote substation. We made calculations of the voltage drop in the lines, voltage at the inputs of substations and electricity losses for transit. The study of the radial power supply system was performed in the daytime maximum mode; the minimum load mode was performed at night and in the peak load mode. As a result of modeling the operating modes, the indicators of the classical radial power supply scheme were compared with the indicators of the system when the local generation facilities were switched on during the working shift or during peak hours. Connection of reserve sources allows reducing voltage fluctuations along the line and reducing power losses for transit.

Cooperative Eco-Driving of Multi-Train Under dc Traction Network

Cooperative eco-driving of multi-train combined with dc railway system can achieve energy saving at the substation level for the metro system. This article presents an integrated optimization method for eco-driving by combining energy-efficient train control and dc traction power supply system (TPSS) model, to minimize the substation energy consumption. The coupled time-varying TPSS models for single train and multi-train are established, and a novel power flow calculation (PFC) method is proposed, to directly obtain the precise power flow distribution without iterations. Then, customized dynamic programming (DP) algorithms for specific TPSS models are developed, and optimal speed profiles of the tracking train and the preceding train can be respectively obtained by the multi-phase DP method. The former maximizes the utilization of a distributed regenerative braking energy (RBE), and the latter actively generates RBE to be fully utilized. Finally, the performance of the proposed method is analyzed by implementing the numerical experiments with field data from Guangzhou Metro Line 8, and the effectiveness is verified by comparing it with a previous study-based heuristic algorithm (HA). The simulation result indicates that the proposed method can also effectively reduce the lost energy on the catenary, suppress catenary voltage fluctuations, and precise match power during the RBE transmission phase.

Quality and Reliability-Exploitation Modeling of Power Supply Systems

This article describes the issues related to the analysis of the reliability-exploitation of power supply systems in transport telematics devices (PSSs in TTDs). This paper characterizes solutions, which are applied in supply systems, and describes a PSS in a TTD from a main source and a standby one. This enables determining the dependencies denoting the probabilities of the system staying in full ability state, safety threat state, and safety unreliability state. A quality analysis of the PSS in TTD was conducted, and the indicator value of the supply continuity quality was evaluated. This indicator allows the demonstration of continuity quality of power supply (CQoPS) dependency on many quality dimensions, not just reliability. An example demonstrates the calculation of CQoPS factor for both the main and the standby power supply, employing three observations, each influencing the quality. The presented considerations in the field of quality and reliability-exploitation modeling of a PSS can be applied as well in other public utility facilities (including those classified as critical infrastructure). The character of functions performed by critical infrastructure facilities demands an operating continuity of these systems at an appropriate level. The co-first authors of the article once again address the issue of determining CQoPS factor, this time on the basis of modeling using mathematical evidence. TTD is an example in this article, because the presented methods can be used in any kind of system, especially in the power source of critical systems.

교류 급전시스템 실시간 시뮬레이션을 위한 고정설비 해석 모델 개발

본 논문에서는 교류 급전시스템을 구성하는 각종 전력설비의 동적 성능 시험을 위한 실시간 시뮬레이터의 모델링 방법과 그 결과를 제시하였다. 교류 급전시스템을 구성하는 주요 고정 설비, 즉 스코트변압기, 단권변압기 및 전차선로의 모델링을 제시하였다. 각 설비들의 회로 구성을 분석하여, 실시간 시뮬레이터의 단상 설비 라이브러리를 조합하는 방법으로 회로 모델링을 하였다. 또한, 각 설비의 특성을 나타내는 파라미터를 얻기 위하여, 스코트 변압기와 단권변압기는 형식시험 성적서를 활용하였고, 전차선로는 현장 측정을 통하여 자기 임피던스 및 선간 어드미턴스를 얻었다.

Mathematical model of power supply system for remotely operated underwater vehicle with dc power transmission line and load voltage feedback

The paper deals with a mathematical model of the closed loop power supply system for a remotely operated underwater vehicle with a DC transmission line via a rope-cable and the load voltage feedback. The state-space method is used to develop the mathematical model. Using differential equations in the form of Cauchy alleviates significantly the mathematical description. The results for both simulation and mathematical models of the closed loop system are compared, thus, confirming the adequacy of mathematical description and prospects for further application in the design of a versatile tool for calculating and adjusting the parameters of the control system for the power supply system under study.

Modeling of power supply systems of stationary railway objects

Modeling of power supply systems of stationary railway objects

Design and Health Evaluation of Monitoring Test Platform for Metro Traction Power Supply System

Subway traction power supply system is the energy source of subway operation. The normal operation of subway traction power supply system is directly related to the stable operation and safety of subway. If the subway traction power supply system breaks down, it not only will cause economic losses, but also may cause social disorder. Therefore, it is of great significance to study the traction power supply system of subway to ensure the safe operation of subway. The establishment of a reasonable monitoring and testing platform, the simulation analysis of the traction power supply system, and the regular health assessment can provide a strong guarantee for the safe operation of the subway. This paper aims to design a practical test platform through MATLAB modeling, so as to establish a simulation model of subway traction power supply system, and comprehensively monitor and grasp the health status of subway traction power supply system. This paper quantitatively evaluates the health status of subway traction power supply system, applies the principle of multilayer immunity, establishes the traction power supply system of analytic hierarchy process (AHP), and constructs the immune monitoring system of each layer. This method can provide the health status information of subway traction power supply system, subsystems, and components comprehensively, accurately, and intuitively and determine the subsystems and components that need to be maintained.

Modeling of three-phase inverter power supply system in Simulink

A model of a three-phase electronic converter of electric energy for an autonomous power supply system has been studied. The objective is measuring the percentage of the higher harmonics in the output of the three-phase inverter voltage and the effect of adding a passive selective Notch filters. Their inclusion in the output circuit creates a model of the system with improved electromagnetic compatibility, and hence an increased power factor and efficiency. A virtual architecture of the three-phase inverter power supply system has been developed in Matlab - Simulink software environment. The invertor is built of separate functional blocks simulating the components that can be embedded in a real project. The schematic diagram includes three-phase symmetric loads with three-phase filters models. The main operation modes of the invertor are modeled and the effects of adding three-phase filters to the output circuit after the voltage inverter are analyzed. From the pulse with modulation simulation, the frequency spectrum for the output current IL and voltage UL has been synthesized.

Имитационная модель фотодизельной системы электроснабжения с интеллектуальным управлением в Matlab/Simulink

In this article, a simulation model of an autonomous PVdiesel power supply (PDPS) system with direct current is considered. The autonomous PDPS is implemented in the Simulink programming environment of the Matlab software package. The system includes: a photovoltaic power station (PPS), a diesel generator (DG), an energy storage system (ESS), a remote consumer as well as auxiliary converters. The PDPS model makes it possible to analyze the energy balance between generation, consumption, and the energy exchange available from the ESS connected via a DC bus (DCB). With the help of the proposed model, it is possible to analyze and optimize the technical and economic indicators of DC power plants with the priority of the PPS contribution: reducing the consumption of diesel fuel and carbonation of the air reducing the cost of 1 kWh for the remote consumer and controlling the switching in the power plants as per logical conditions. The obtained technical and economic indicators of the PDPS using direct current are superior to similar systems based on alternating current due to an increase in the contribution of the PPS to the energy balance. As a result of experiments with changing input conditions, i.e. annual changes in insolation and temperature at different latitudes, the authors justify technical, economic, and environmental criteria for the effectiveness of decision-making and recommendations for the design and operation of PDPS power plants. Intelligent algorithms for effective control of PV-diesel power systems based on DC are developed and suggested

A simulation model of traction power supply system to determine energy indicators in conditions of energy storage system operation

A simulation model of traction power supply system to determine energy indicators in conditions of energy storage system operation

An Online Thermal Deicing Method for Urban Rail Transit Catenary

The frequent icing of a catenary in cold areas has seriously affected the normal operation of urban rail transit. Among many deicing methods for catenary, the thermal deicing method that uses current Joule heat to melt ice has been widely adopted due to its efficiency and safety. However, most of the thermal deicing methods are only applicable when the line is out of service, which cannot solve the icing problem of catenary during the operation period. In order to solve this problem, this article proposes a novel online thermal deicing method that takes the catenary of up and down lines as the deicing current loop. Based on the Bolsdorf theory, the deicing and anti-icing current of catenary are calculated, and the structure and control strategy of the deicing power unit (DIPU) are designed. The influence of online deicing on the traction power supply system is quantitatively analyzed by the electric network model. The accurate dynamic simulation model of the traction power supply system, including the DIPU, is established to verify the analysis conclusion. The results show that the online thermal deicing method has limited influence on the traction power supply system but achieves good deicing performance in the normal operation of the line.