مهندسی برق قدرت
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آخرین مطالب
- امواج هارمونیک چه اثری در برق دارد؟
- افشای جزئیات امواج هارمونیک چه اثری در برق دارد ؟
- تلگرام شرکت هونام انرژی
- امواج هارمونیک چه اثری در برق دارد ؟
- دوره آموزش تئوری و عملی رله و حفاظت
- دوره آموزشی نرم افزار NEPLAN
- حفاظت از سرج برای ایستگاه شارژ خودرو الکتریکی
- حفاظت از سرج برای LED Street Light
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- حفاظت از سرج برای توربین بادی
امکانات وب
The EMT calculation is available in two different simulation frames, DQ0 and ABC.
The EMT mode is used for fast electromagnetic transient simulation, where the electrical model quantities are described by their instantaneous values. The ABC mode is more flexible and can be used in case of asymmetrical or unbalanced network conditions. EMT-ABC is the preferable solution for inrush currents and switching studies. The DQ0 mode can be used in case of balanced systems with balanced or unbalanced faults.
Reference: NEPLAN
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نویسنده: مهدی رستمی
The NEPLAN Small Signal Stability module offers eigenvalue analysis (modal analysis) for electrical power systems. It provides information about the inherent dynamic characteristics of the power system and assists in its design. It is typically used in studies of interarea oscillations. It combines exceptional ease of use with the latest techniques and standards in both electrical power engineering and software design.
General Characteristics
Data scaing and eigenvalue sensitivity functions
Automatic construction of the linearized state space notation for the complete system, including generators, static loads, control circuits, etc.
Advanced synchronous machine modelling. Selection for every synchronous machine of one of the five models: infinite, classical, transient, subtransient and general. Saturation curves for both, d-axis and q-axis
Automatic calculation of eigenvalues, eigenvectors, mode shapes, participation factors for eigenvalues and state variables
Text results:
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The RMS calculation is available in two different simulation frames, DQ0 and ABC.
The RMS mode is used for transient stability or electromechanical simulation, where the electrical model quantities are described by their fundamental frequency components. The DQ0 mode can be used in case of balanced systems with balanced or unbalanced faults. RMS-DQ0 is the preferable solution for typical stability studies. The ABC mode however is more flexible and should be used in case of asymmetrical or unbalanced network conditions.
Reference: NEPLAN
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نویسنده: مهدی رستمی
دورهای تخصصی مهندسی برق آبان و آذر ماه 1395 شرکت هونام پارت انرژی
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برچسب: دورهای تخصصی مهندسی صنایع,
نویسنده: مهدی رستمی
This module is used to reproduce networks that are described in files generated by PSS/E. It can be used for importing files containing information on the network topology and on sequence data to prepare unbalanced network solutions. Load flow and fault analysis calculations and dynamic simulations can be run on the built networks.
PSS/E Import accepts as input files with extension .raw, .seq or .dyr generatred by PSS/E. *.raw files contain the bulk power flow data needed to construct the network and run the power flow calculation. For fault analysis, a *.seq file has to be provided, after the respective *.raw file has been imported to the project. For dynamic analysis, a *dyr file has to be provided respectively.
The module supports the import of networks generated by PSS/E versions 29 to 33.4.
Reference: NEPLAN
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The NEPLAN Dynamic Simulator offers an extensive and detailed set of models for all the power system elements. An extensive library of controller models is available, including exciters, turbines, PSSs, converter controllers, etc. The NEPLAN Dynamic Simulator can handle in a unique mathematical system a hybrid model formulation: combination of AC and DC networks can be easily simulated all together, including HVDC systems, DC-lines and several DC elements (batteries, photovoltaic panels, fuel cells). All the models are described in the Differential Switched-Algebraic State Reset Equations structure, called DSAR.
The flexible environment of NEPLAN Dynamic Simulator offers also excellent functionalities to develop user defined models. For each element it is possible to build a user defined model by one of the following three approaches:
function blocks (graphic oriented)
user defined DLL (automatically created from symdef files)
interface with Matlab/Simulink®
Especially
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This module computes the motor start-up in unlimited networks and offers the possibility of simultaneous or time-delayed start-up for any desired number of motors. Motor Starting module can simulate different motor models, depending on the motor data entered and it also allows for start-up devices, such as star-delta starter, series resistor, transformer, soft starter, etc.
General Characteristics
Identification of motor parameters using the least square method from input values for torque, current and cos(phi) in function of the slip
Saturation and eddy-current losses in the motor allowed for (linear or point-by-point)
Libraries for standard motor data, plus additional extendable libraries for Me(s), I(s) and cosphi(s) are available
Operating point computation for all non-starting motors in accordance with their load characteristics (Newton-Raphson)
Automatic tap changing transformers are allowed for after a user-defined time-delay
Load torque entered as a characteristic or as a lin
برچسب: neplan motor starting,
نویسنده: مهدی رستمی
The NEPLAN Dynamic Simulator is one of the most advanced tool for dynamic simulations on the market. It includes the following four different types of calculation:
RMS (Transient Stability simulation), in DQ0 and ABC reference frame
EMT (Electromagnetic Transients simulation), in DQ0 and ABC reference frame
All necessary models and simulation methods are integrated with a very high accuracy and performance.
The NEPLAN Dynamic Simulator implements a unique mathematical framework for large-scale, nonlinear system with fast/slow continuous and discrete (hybrid) systems. The automatic and sophisticated built-in initialization algorithms avoid struggling with any kind of initialization procedure. The adopted structure gives also very high flexibility in creating userdefined models.
Applications
Short-term, mid-term and long-term dynamic simulations
Machine dynamics and startup simulations
Angle stability with several different type of regulators
HVDC-(light), FACTS, SVC design
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This module performs Short Circuit Analysis on 3-phase, 2-phase and 1-phase AC and DC systems, for single-, two- (with and without earth coection) and three-phase faults. It provides the option of computing line faults or even user-defined fault types such as double earth faults, faults between two voltage levels, conductor opening, etc.
General Characteristics
Standards IEC909 1998, IEC60909 2001, IEC60909 2016, ANSI/IEEE C37.10/C37.13, G74 Engineering Recommendation
IEC 61363-1 for off-shore/ship plants
IEC 61660 for DC networks
Superposition method with consideration of prefault voltages from a load flow
Computable fault current types: initial symmetrical short-circuit current and power, peak, breaking, steady state, thermal and asymmetrical breaking current, plus DC component
Computation of minimum/maximum short-circuit current
Accurate model for transformer earthing coection
Earthing system for common earthing of any number of transformers, generators, etc.
Petersen coil t
برچسب: short circuit analysis neplan,
نویسنده: مهدی رستمی
Load flow
This module performs Load Flow studies for 3-, 2- and 1-phase AC and DC systems for meshed, looped and radial networks from HV to LV. It includes disperse generation models such as wind power, photovoltaic, small hydro, geothermic, etc. and provides a wide variety of calculation options to address specific applications. Modelling can be particularly defined with NEPLAN® C/C++ API.
General Characteristics
Computation methods: Current Iteration, Newton Raphson, Extended Newton Raphson, Voltage Drop (per-phase), DC load flow
Voltage and flow control with phase-shifting transformers
HVDC, PWM and FACTS devices, like SVC, STATCOM, TCSC, UPFC
DC-Batteries, DC-Fuel cells, DC-Voltage source, DC-Photovoltaic panels
Node types: slack, PQ, PV, PC, SC, PI, IC with intuitive assignment. More than one slack node possible
Power interchange between area / zones (area interchange control) and distributed slack node
Predefined and user defined scaling factors for fast load and generation
برچسب: neplan load flow,neplan load flow analysis,neplan load flow with load profiles,neplan power flow,
نویسنده: مهدی رستمی
Arc Flash Calculation is completely integrated and based on NEPLAN® short circuit and selectivity analysis modules. It calculates the incident energy for reduced and unreduced arcing current and in function of the working distance and it automatically determines the Arcing Fault Clearing Time. It also determines individual arcing current contributions.
General Characteristics
Calculation methods: IEEE 1584 & NFPA 70E
New standards: IEEE for DC systems & ISSA (Inteational Social Security Association)
Supports ANSI/IEEE and IEC short circuit calculation for symmetrical and unsymmetrical fault
Individual parameter setting to determine the incident energy
Automatically assign hazard category
Arc Flash Calculation module gives the possibility of multiple arc flash simulations just in one run.
Results
Upon calculation results are automatically displayed on the single line diagram while their content and graphical information can be customized. Display of results is node oriented and
برچسب: neplan arc flash,
نویسنده: مهدی رستمی
This module allows the calculation of mutual impedances and capacitances in the positive and negative-sequence systems by entering the information on the conductors characteristics and configuration. If the coupling impedances and the line data are known, they can be entered directly in the line-coupling and line data dialogues.
General Characteristics
Circuit and coupling parameters of the overhead lines are computed from the conductor configuration
Overhead lines with up to 6 3-phase systems and 3 earth wires can be computed
Each system can have symmetrical or asymmetrical structure: any phase(s) can be omitted
Earthing of 3-phase systems is considered
Unrestricted number of overhead lines can be entered
Handling of parallel, galvanically coected systems
Consideration of system characteristics such as segmentation, line-twisting, slacking, etc.
Parameters and conductor configuration are saved in an SQL database
Line coupling is considered by the Short Circuit Calculation, the
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نویسنده: مهدی رستمی
This module is designed to reduce the size of a network model by replacing sets of buses and their coected elements (lines, transformers, etc.) with a smaller but exact, numerically equivalent network. For a properly chosen set of buses, this equivalent network will have fewer buses and branches than the original, yet still provide the correct response to faults or load flow calculations in the unreduced portion.
The network can be reduced for
symmetrical or asymmetrical short circuit calculations according to IEC60909, ANSI/IEEE or superposition method and
load flow calculation
The reduced network gives the same short circuit or load flow results as the original network. Giving the nodes to be reduced, the program determines the boundary nodes automatically.
Given any network for short circuit or load flow calculation and the nodes to be reduced, boundary nodes are automatically determined. Functions to select a complete network area to be reduced are available.
The reduced netwo
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This module is used for the selection of the type and cross-sectional area of a cable as well as the protection device for an assumed passive or motor load and a given infeed. The cable type can be selected either from the predefined cable library within NEPLAN or from user-defined cable libraries depending on various inteational standards such as VDE, IEC, NEC, etc. The basic principle underlying cable sizing calculations remains the same for all these standards. However, it is important to consider the geographical conditions and then select an appropriate standard. The module can also be used for the inspection of already installed cables.
General Characteristics
Automatic selection of protection device rating and setting. Device is taken from NEPLAN protection library
Sizing of one cable or any number of cables together (distributed radial network)
Maximum length of selected cable type and section for which the criteria is still fulfilled
Criteria of dimensioning
Service cur
برچسب: neplan cable sizing,
نویسنده: مهدی رستمی
The module Time Simulation (Load Flow) makes a single Load Flow calculation (forecast) or a sequence of Load Flow calculations (Time Simulation). The active and reactive power of consumers and generators with measurement data are determined before each Load Flow calculation.
Measured load data will be automatically applied. If measured data for a load at a certain date caot be found in the database during a time simulation, the entered constant values for active and reactive power will be used. Missing measured values of a day profile will be linearly interpolated. This means that measured load values for a certain date (day) must be defined at least by one measured point. Otherwise the constant values of active and reactive power will be applied.
In case Scaling Types are used, the scaling of loads is done based on the load profiles defined in Day Characteristics and Long Term Characteristics, and the weakly/seasonal definition (see Scaling Types section)
Reference: NEPLAN
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This module calculates the limiting MW transfer value between two control areas (source and sink) that is available without any violation of security limits.
General Characteristics
ETSO methodology (load flow based, MW generation shift)
Large flexibility in limit handling (individual activation of limits)
Consideration of user-defined contingency scenarios
Consideration of Transmission Reliability Margin (TRM )
Results
The outcome of the calculation is a list of the limit violations for every step of increasing the MW transfer from source to sink as for
the base case
each contingency case
The module provides calculation of the Total Transfer Capacity (TTC) and the Net Transfer Capacity (NTC).
Reference: NEPLAN
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This module is an ideal tool to provide insight into the nature of voltage stability problems. It allows the examination of a wide range of system conditions providing four approaches for static voltage stability analysis of power systems: V-Q curves, P-V curves, V-Q sensitivity analysis and Q-V eigenvalue analysis (modal analysis).
General Characteristics
Automatic calculation of P-V curves, V-Q curves, dV/dQ self-sensitivities, dV/dQ mutual sensitivities, eigenvalues, eigenvectors, bus participation factors, branch participation factors and generator participation factors.
Result tables: results are presented in clear form and can be exported by Copy-Paste-methods to exteal programs (e.g. MS-Excel).
Graphical results: results can be visualized by the fully integrated graphical results manager.
Export files: results are stored in text files for advanced data export.
Charts can be easily printed and exported to exteal programs (e.g. MS-Word) by clipboard functions. A variety o
برچسب: neplan voltage stability,
نویسنده: مهدی رستمی