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59 results about "Power systems computer aided design" patented technology
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Micro-grid multi-objective optimized operation control method
ActiveCN102354974AReduce pollutionEnsure power supply reliabilitySingle network parallel feeding arrangementsOperation modeMATLAB
The invention discloses a micro-grid multi-objective optimized operation control method, which comprises the steps of: constructing a micro-grid operation indicator function aiming at wind-light complementary and cold, heat and electricity combined supply micro-grid; then constructing a complete small signal model of the micro-grid for theoretical analysis to provide theoretical guidance for the multi-objective optimized operation control of the micro-grid; and finally on the basis of a multi-objective intelligent optimization theory, comprehensively using power system computer aided design (PSCAD) / electromagnetic transients including direct current (EMTDC) and MATLAB software to design the micro-grid multi-objective optimized operation control method, so as to enable the micro-grid to realize comprehensive optimization of multiple operation indicators such as economy, cleanness, reliability, stability, dynamic performance and the like in different operation modes such as a synchronized operation mode, a mode capable of being switched between the synchronized operation mode and an independent operation mode, an independent operation mode with sudden load change and a resynchronized operation mode.
Owner:SHANDONG UNIV
Modular multilevel converter (MMC) topology converter efficient electromagnetism transient state simulation method
ActiveCN103116665AReduce interface callsImprove Simulation EfficiencySpecial data processing applicationsTransient stateComputer Aided Design
The invention discloses a modular multilevel converter (MMC) topology converter efficient electromagnetism transient state simulation method. The method comprises the following steps: (1) building a thevenin equivalent circuit of a submodule and acquiring the hevenin equivalent circuit of a series subnodule, (2) opening power system computer aided design (PSCAD) and operating Fortran script editing user-defined module, (3) replacing at least one submodule by using the user-defined module, (4) using status bit to show insulated gate bipolar transistor (IGBT) status in the user-defined module of the PSCAD, (5) and figuring submodule capacitor voltage and submodule current by using a difference equation. The method reduces the number of nodes of a MMC topology converter model, and is quick in simulation speed and high in efficiency.
Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
Software interface for automatically generating simulation calculation model of PSCAD power system
ActiveCN101996271ASimplify the compilation processReduce the difficulty of compilationSpecial data processing applicationsPower qualityComputational model
The invention relates to the technical field of simulation calculation of a power system, in particular to a software interface for automatically generating a simulation calculation model of a power system computer aided design (PSCAD) power system. The software interface comprises a power system-geographic information system conversion module used for resolving a geographic information database,a power system-energy management system conversion module used for resolving an energy management database, a graphical simulation file used for writing a PSCAD simulation calculation model, and a simulation model automatic generation module used for automatically generating a simulation calculation model. In the software interface, the conventional various data resources of electric utilities isfully utilized, so that the automatic compilation of the PSCAD simulation calculation model is realized, the compilation process of the simulation calculation model is greatly simplified, the compilation difficulty of the model is reduced, the compilation efficiency of the model is greatly improved, and the accuracy of the model is improved, wherein the generated simulation calculation model not only can be used for the conventional power flow calculation and steady-state analysis but also can be used for various fields such as power quality evaluation, fault analysis and the like.
Owner:WUHAN UNIV
Electric energy quality analyzing method based on Hilbert-Huang transform
InactiveCN102323480AAvoid the influence of human factorsEasy to implementFrequency analysisMeasurement using digital techniquesPower systems computer aided designAutomotive engineering
The invention discloses an electric energy quality analyzer based on Hilbert-Huang transform, which comprises an electric energy quality actual measurement data acquisition part and an electric energy quality analysis part. The electric energy quality actual measurement data acquisition part can be used for realizing the acquisition of electric energy quality data and is mainly used for conditioning signals and acquiring data; and the electric energy quality analysis part can be used for realizing the detection of transient disturbance characteristic of electric energy quality and the analysis of harmonics by using the Hilbert-Huang transform as a core algorithm. According to the electric energy quality analyzer disclosed by the invention, a method for automatically configuring a superposed high-frequency strong signal during mode mixing for improving the transient oscillation analysis as well as a self-adaptive design scheme of a filter during mode mixing for improving the harmonic analysis are established. The analyzer can be used for realizing the theoretical research on a power system together with a PSCAD / EMTDC ((Power System Computer Aided Design / Electro Magnetic TransientsIncluding DC) under a simulation analysis mode, realizing the quality detection for electric energy of a power grid together with an actual measurement data interface in an actual measurement analysis mode as well as analyzing the actual operation condition of the power system.
Owner:SOUTHWEST JIAOTONG UNIV
MMC direct circular current inhibition method suitable for asymmetric AC power grid
ActiveCN105119509ASimple structureImprove general performanceAc-dc conversionSequence controlTime domain
The invention discloses a Modular Multilevel Converter (MMC) direct circular current inhibition method suitable for an asymmetric AC power grid. The circular current inhibition method derives a capacitance voltage fluctuation expression of an asymmetric system, and analyzes components of an imbalance voltage reference value for the circular current inhibition. A control strategy is suitable for two different negative sequence control objects. A result shows that the active component of the reference value is a second harmonic component no matter what kind of condition the AC system is operated in. The imbalance voltage reference value for circular current inhibition is obtained by direct calculation without a Proportional Integral (PI) controller or a resonance controller. The positive sequence, the negative sequence and the zero sequence circular current components in an operation state of the asymmetric power grid are simultaneously inhibited. At the same time each phase has an independent structure. The MMC direct circulation inhibition method is suitable for the symmetric or asymmetric AC system. A double end MMC-HVDC (High-Voltage Direct Current) model is constructed on a Power Systems Computer Aided Design / Electromagnetic Transients including DC (PSCAD / EMTDC) time-domain simulation platform. The validity of the MMC direct circular current inhibition method under the conditions of the symmetric and asymmetric power grids provided by the invention is verified.
Owner:SHANGHAI ELECTRIC POWER DESIGN INST
Method of producing power system computer aided design (PSCAD)/ electromagnetic transients including DC (EMTDC) electrical power system simulation model
ActiveCN102930110AEfficient and accurate simulation analysisSpecial data processing applicationsInformation technology support systemPower system simulatorTransient state
The invention discloses a method of producing a power system computer aided design (PSCAD) / electromagnetic transients including DC (EMTDC) electrical power system simulation model. According to the method, power system simulator / engineering (PSS / E) format data files are used, and needed parameters to build the PSCAD / EMTDC electrical power system simulation model are extracted and calculated. Then, an electrical power network module is divided, and the parameters are used to produce automatic layout sub-network modules under the circumstance of PSCAD / EMTDC by passing through corresponding coordinates and changing algorithms. At last, auto routing is conducted among the sub-network modules and inside the modules, and building of the PSCAD / EMTDC electrical power system simulation model is achieved. According to arranged requirement of the parameters of a PSCAD / EMTDC electro-magnetic transient simulated program, the method is capable of conducting corresponding data conversion and inputting the PSCAD / EMTDC electro-magnetic transient simulated program. The produced PSCAD / EMTDC electrical power system simulation model can achieve efficient and accurate simulated analysis of the alternating current or direct current electrical power system.
Owner:STATE GRID CORP OF CHINA +3
Modeling method for performing dynamic characteristic research on hybrid alternating current/direct current (AC/DC) transmission system
InactiveCN102361329AReduce difficultyReduce workloadElectric power transfer ac networkEngineeringAlternating current
The invention discloses a modeling method for performing dynamic characteristic research on a hybrid alternating current / direct current (AC / DC) transmission system. The modeling method comprises the following steps of: constructing a main circuit and a control circuit of a DC transmission system in simulation software power system computer aided design (PSCAD); and connecting an equivalent AC system to the commutation bus position on the main circuit of the DC transmission system to form an integrated hybrid AC / DC system model. By the method, the dynamic characteristics of the hybrid AC / DC transmission system can be subjected to simulation research well; the DC system is modeled in detail; the AC system is subjected to equivalent treatment; and AC and DC are connected at the commutation bus position of the DC system, so that difficulty and workload of detailed modeling of the AC system are greatly reduced and accuracy of research is guaranteed.
Owner:SHANDONG ELECTRIC POWER RES INST +1
Power system computer aided design (PSCAD) based running fault simulation method of capacitor voltage transformer
InactiveCN106096076ALow costModeling method is clearGeometric CADSpecial data processing applicationsCapacitanceSimulation
The invention discloses a power system computer aided design (PSCAD) based running fault simulation method of a capacitor voltage transformer (CVT). The PSCAD based running fault simulation method comprises the following steps of sorting device parameters of a 500-kV CVT in a site during actual running; building a system model of a CVT equivalent circuit, setting device parameters for the system model, and simultaneously configuring a secondary voltage monitor for the system model of the CVT equivalent circuit; building an adjustable AC power module, an adjustable capacitor component module and a module controller; performing breakdown fault analogue simulation of a capacitor component in the CVT; and acquiring a correlation between a breakdown fault of the capacitor component in the CVT and secondary voltage change before and after performing breakdown fault analogue simulation of the capacitor component in the CVT. The PSCAD based running fault simulation method has the advantages of flexibility, high efficiency, simplicity, feasibility, accuracy, fineness, no safety risk and no test cost, various running faults of the CVT can be simulated, a basis is provided for research on state monitoring and fault diagnosis of the CVT, and the PSCAD based running fault simulation method has favorable application prospect.
Owner:STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH +2
Automatic conversion method for converting PSASP (Power System Analysis Software Package) data model into PSCAD (Power System Computer Aided Design) data model
ActiveCN105930575AIncrease productivityImprove accuracySpecial data processing applicationsReduced modelTransient state
The invention discloses an automatic conversion method for converting a PSASP (Power System Analysis Software Package) data model into a PSCAD (Power System Computer Aided Design) data model, and realizes automatic conversion to a PSCAD / EMTDC (Electro Magnetic Transient in DC System) electromagnetic transient model from PSASP electromechanical transient data. The method provided by the invention automatically converts PSASP data and model into PSCAD model data, automatically generates a data file of a PSCAD format, avoids the heavy work of parameter conversion and input during manual modeling, reduces modeling errors, and improves model generation efficiency and model generation accuracy so as to realize a purpose that a large-scale DC power system is subjected to accurate electromagnetic transient analysis.
Owner:STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +3
Whole process transient state simulation method supporting microgrid planning design
ActiveCN104268345AIncrease capacityOvercome limitationsSpecial data processing applicationsWaveform analysisPower systems computer aided design
The invention discloses a whole process transient state simulation method supporting a microgrid planning design. The whole process transient state simulation method supporting the microgrid planning design comprises the steps of building a microgrid model in PSCAD (Power System Computer Aided Design) or EMTDC (Electromagnetic Transients including DC) simulation software based on the planning result of the microgrid planning software, accomplishing microgrid transient state simulation in various working conditions through a microgrid whole process transient state simulation method, performing data analysis and waveform analysis of the simulation result through the whole process transient state simulation method, judging the microgrid running characteristics under the configuration and performing feedback compensation on a micro source capacity, putting forward an improvement program of the microgrim equipment configuration according to the analysis result and obtaining a reliable and stable microgrid planning result. According to the whole process transient state simulation method supporting the microgrid planning design, microgrid basic equipment is comprehensively taken into consideration, microgrid planning requirements in different conditions and working conditions can be met, and high adaptability can be obtained; feedback compensation supporting of the microgrid planning design from the perspect of microgrid transient state stability, limitation of an original microgrid planning method is solved and high practicability and project application values are obtained.
Owner:SOUTHEAST UNIV
Method and system for simulating parameters of three-phase auto-coupling transformer
ActiveCN102521017AHigh utility valueHigh simulationFixed transformersSoftware simulation/interpretation/emulationLow voltageSimulation
The invention provides a method and a system for simulating parameters of a three-phase auto-coupling transformer. The method comprises the following steps of: performing certain connection on high and medium voltage sides of a common single-phase three-winding transformer model in power system computer aided design (PSCAD) simulation software to form a three-phase three-winding auto-coupling transformer model; converting transformer parameters in an actual grid; and inputting the parameters into a self-built three-phase three-winding auto-coupling transformer model, so that electromagnetic transient simulation for asymmetric three-phase parameters of a 500kV auto-coupling transformer can be performed, the voltage and current of high, medium and low voltage sides of the transformer can be analyzed, influence of relay protection of the 500kV auto-coupling transformer caused by the asymmetric three-phase parameters can be determined, and relay protection analog control is performed. By adoption of the method provided by the invention, the problem of three-phase asymmetry of the auto-coupling transformer can be solved by using an auto-coupling transformer model which is not in direct electric connection, the influence of the electrical characteristic and relay protection of the transformer caused by the asymmetric three-phase parameters can be determined, and a high practical value is obtained.
Owner:FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID +1
Distributed photovoltaic power generation system equivalent simulation model based on PSCAD (Power System Computer Aided Design)/EMTDC (Electromagnetic Transient Including DC)
ActiveCN105608244AReduce the amount of calculation dataReduced simulation timeSpecial data processing applicationsElectromagnetic shieldingVoltage source
The invention belongs to the technical field of distributed photovoltaic power generation, particularly relates to a distributed photovoltaic power generation system equivalent simulation model based on PSCAD (Power System Computer Aided Design) / EMTDC (Electromagnetic Transient Including DC), and is suitable for simplifying a distributed power generation system simulation model in the PSCAD / EMTDC and carrying out equivalent simulation on large distributed power station in the PSCAD / EMTDC. The distributed photovoltaic power generation system equivalent simulation model comprises a photovoltaic array module, a photovoltaic array controllable voltage source module, an inverter controllable voltage source module, a MPPT (Maximum Power Point Tracking) control module of the photovoltaic array controllable voltage source module, a control module of the inverter controllable voltage source module, a two-phase rotating coordinate system to three-phase stationary coordinate system conversion module and an inverter side filtering inductance and equivalent power grid model, wherein the photovoltaic array module, the inverter controllable voltage source module and the inverter controllable voltage source module are connected through the inverter side filtering inductance and equivalent power grid model. A calculation data size can be reduced, simulation time is shortened, and calculation speed and efficiency can be obviously improved.
Owner:STATE GRID CORP OF CHINA +2
Method for automatically converting electromagnetism transient models and element pictures from PSCAD (power system computer aided design) to ADPSS (advanced digital power system simulator)
ActiveCN104699907AAvoid the disadvantages of making mistakes hard to checkImprove efficiencySpecial data processing applicationsTransient stateComputer Aided Design
The invention provides a method for automatically converting electromagnetism transient models and element pictures from a PSCAD (power system computer aided design) to an ADPSS (advanced digital power system simulator). The method comprises the following steps of determining coordinates of endpoints of elements; performing topology analysis to determine a connection relation between the elements; automatically generating an electromagnetism transient model of the ADPSS; and forming an intermediate file of the ADPSS. By the method for automatically converting the electromagnetism transient models and the element pictures from the PSCAD to the ADPSS, the existing data files of which the format is PSCAD are directly converted into intermediate data files of a simulation procedure of the ADPSS, and the purpose of efficiently and accurately simulating and analyzing a large-scale alternating-current and direct-current power system is achieved.
Owner:STATE GRID CORP OF CHINA +2
Transformer electromagnetic transient simulation modeling method based on PSCAD/EMTDC (power system computer aided design/ electromagnetic transients including DC) software
InactiveCN105205238AModel parameters are easy to obtainSpecial data processing applicationsHysteresisTransformer
Owner:SOUTH CHINA UNIV OF TECH +1
Simulation method of substation equipment security analysis after extra-high voltage capacity expansion
ActiveCN103823143AEnable Hybrid Simulation AnalysisEnsure proper controlElectrical testingTransformerSimulation
The invention relates to a simulation method of substation equipment security analysis after extra-high voltage capacity expansion. The simulation method comprises the following steps: step one, constructing a equivalent network model by adopting a PSCAD (power system computer aided design) according to trend data of an actual power grid, wherein the equivalent network model comprises a load model, an alternating current power transmission line model, a generator model and a transformer model; step two, simulating the PSCAD equivalent network model under a steady state condition and a fault condition to obtain steady-state voltage current data and over-voltage and over-current data, analyzing running states of main equipment under the steady state condition and the fault condition; step three, reading in the over-voltage, over-current data output by the PSCAD under various fault conditions by using MATLAB (matrix laboratory) software, programming to analyze the running states of secondary equipment. The influence on the primary equipment and the secondary equipment of a substation at an extra-high voltage environment is researched, the safe running of the main equipment and the accurate control of the secondary equipment are guaranteed and the safe and stable running of an extra-high voltage power grid is guaranteed.
Owner:STATE GRID CORP OF CHINA +2
Simulation model simplification structure of permanent magnetic direct drive wind generation set and based on power system computer aided design (PSCAD)
InactiveCN103198191AImprove Simulation EfficiencyReduce simulation computing timeSpecial data processing applicationsElectricityReduced model
A simulation model simplification structure of a permanent magnetic direct drive wind generation set and based on the power system computer aided design (PSCAD) belongs to the technical field of wind generation sets. A simplification model comprises a wind power machine module, a permanent magnetic direct drive generator module, a machine side controlled voltage source module, a control module of the machine side controlled voltage source module, a net side controlled voltage source module, a control module of the net side controlled voltage source module, a net side filter inductor and an infinite power grid. The wind power machine module is connected with the permanent magnetic direct drive generator module through a transmission chain, the permanent magnetic direct drive generator module is connected with the machine side controlled voltage source module, and the net side controlled voltage source module is connected with the infinite power grid. The simulation model simplification structure has the advantages of being suitable for simplifying a simulation model of the permanent magnetic direct drive wind generation set in the PSCAD and improving simulation speed and efficiency when wind power plant equivalence is conducted in the PSCAD.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Collaborative interface for co-simulation of PSCAD (power system computer aided design) with third-party simulation software or hardware
InactiveCN104102526AMake up for the lackCompensation for other simulation softwareSoftware simulation/interpretation/emulationComputer hardwareThird party
The invention provides a collaborative interface for co-simulation of PSCAD (power system computer aided design) with third-party simulation software or hardware. The collaborative interface is characterized by comprising a collaborative module cosim_interface, set through a custom module of the PSCAD; the collaborative module comprises an interface declaration and an interface module; data interaction between the PSCAD and the third-party simulation software or hardware during co-simulation is achieved through the collaborative module cosim_interface, co-simulation of the PSCAD with the third-party simulation software or hardware is achieved, and the blank that the present PSCAD is in short of co-simulation with otherness of the simulation software or hardware is filled.
Owner:CHINA XD ELECTRIC CO LTD
Subsynchronous resonance electro-mechanical combination simulation method and system
The invention discloses a subsynchronous resonance electro-mechanical combination simulation method and system, wherein the method comprises the following steps that modeling parameters of an electric power system are obtained, and an electric model is built in PSCAD (power system computer aided design) software; modeling parameters of a steam turbine generator set shaft system are obtained, and a continuous mass block shaft system model is built in ANSYS software; a state file and a data file are set; a data communication interface is built; after starting signals are received, the combination simulation of the PSCAD software and the ANSYS software is realized through the electric model and the continuous mass block shaft system model. The method according to the embodiment of the invention has the advantages that through the combined calculation of the PSCAD software and the ANSYS software, the complicated mechanical shaft system is applied to time domain simulation analysis, so that the detailed torque change of each part of the shaft system can be directly obtained, and the foundation is laid for the subsequent fatigue analysis, more complete electro-mechanical coupling dynamic analysis is realized, and the analysis accuracy is improved.
Owner:TSINGHUA UNIV
PSCAD (Power System Computer Aided Design)-based electric complex torque coefficient scanning method
ActiveCN103778283AAuto scanHigh speedSpecial data processing applicationsSmall amplitudeTorque coefficient
The invention discloses a PSCAD (Power System Computer Aided Design)-based electric complex torque coefficient scanning method, and belongs to the field of stable control of power systems. The method comprises the following steps: (1) loading an electric complex torque coefficient scanning module onto electromagnetic transient software; (2) inputting an electric parameter and a scanning parameter; (3) generating small-amplitude turbulence according to the scanning frequency, and applying the turbulence to the mechanical torque of a rotor specific to the power system which enters a stable state already; (4) extracting an electromagnetic torque signal of a generator and the angular speed response of the rotor after the system enters the stable state once again, and calculating an electric complex torque coefficient; (5) judging whether the scanning frequency surpasses a cut-off frequency or not, if the scanning frequency does not surpass the cut-off frequency, adding a scanning step length on the basis of the frequency, returning to the step (3), and scanning the electric complex torque coefficient of a next frequency point; if the scanning frequency surpasses the cut-off frequency, stopping calculation and finishing scanning. By adopting the PSCAD-based electric complex torque coefficient scanning method, automatic scanning of an electric complex torque coefficient method on time domain simulation software is realized, a simulation method is quick, and the cost is low.
Owner:STATE GRID ECONOMIC TECH RES INST CO +1
Performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection
InactiveCN103268429AImprove performanceReduce incorrect actionsDc network circuit arrangementsSpecial data processing applicationsElectric power transmissionSimulation
The invention discloses a performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection. The method comprises the following steps of: step 1, traversing and scanning asymmetric faults of an alternating-current (AC) electric network in an AC / DC interconnected network in which the high-voltage DC power transmission system stays, and determining an AC fault range influencing the DC 100Hz protection; step 2, determining a time boundary for the faults in the AC fault range, and also determining a delay constant value delta t of the DC 100Hz protection; and step 3, comparing the delay constant value delta t and an upper boundary t1, an upper boundary t2 and a shortest time t3, and evaluating the performance of DC100Hz protection. The system comprises a simulation module, a protection module and an evaluation module. The method and the system integrate the advantages of a short-circuit current calculation program and a PSCAD / EMTDC (power system computer aided design / electromagnetic transient simulation for DC) simulation computing program, fast recognition of the AC fault range influencing the DC 100Hz protection can be realized, and a simple, high-efficiency and practical engineering method is provided for evaluating the performance of DC100Hz protection.
Owner:CSG EHV POWER TRANSMISSION +1
PSCAD (power system computer aided design) model of superconductive current-limiting reactor
InactiveCN103324808AImprove accuracyFast simulationSoftware simulation/interpretation/emulationSpecial data processing applicationsDc currentTransformer
The invention discloses a PSCAD (power system computer aided design) model of a superconductive current-limiting reactor. The PSCAD model is characterized in that the PSCAD model is composed of a three-winding transformer model umec (1), a current sensor (2), a resistor A (3), an IGBT (insulated gate bipolar translator)-2 (5), a resistor B (6) and a direct-current source (8) which are sequentially connected; the resistor A (3) is in series connection with an IGBT-1 (4), and an IGBT-2 (5) is in series connection with a capacitor (7); the three-winding transformer model umec (1) is composed of two serially-connected iron cores and a direct-current excitation system; two alternating-current coils are wound on the two iron cores in series connection, and serially-connected alternating-current windings are serially connected to a power transmission system; direct-current magnetized superconductive windings are wound on center posts of the iron cores. The PSCAD model is high in accuracy, high in simulation velocity, strong in measuring ability, real-time and visual; compared with simulation software ANSYS, the PSCAD model, based on an SPWM (sinusoidal pulse width modulation)-controlled direct-current chopping control circuit of a saturated-iron-core type superconductive current-limiting reactor has the advantages of simplicity and high calculation speed.
Owner:YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST +1
Method and system for simulating short-circuit current shunt coefficients of converter station
ActiveCN107219420AEasy to calculateCorrectly reflect the impactElectrical testingTransient stateMATLAB
The invention discloses a method and a system for simulating short-circuit current shunt coefficients of a converter station. The method comprises the steps of: respectively creating a converter station model and a converter station line model in a PSCAD (Power Systems Computer Aided Design) platform according to structure parameters and line parameters of the converter station, performing short-circuit fault simulation analysis on the converter station model and the converter station line model, reading short-circuit current and earth current waveforms obtained by PSCAD platform simulation, importing the short-circuit current and earth current waveforms into a Matlab platform, and calculating and analyzing the short-circuit current and earth current waveforms by the Matlab platform to obtain the short-circuit current shunt coefficients in a transient state and a steady state of the converter station model respectively. Based on combined simulation of the PSCAD and Matlab platforms, the PSCAD platform can correctly reflect the influence of devices on the converter station and the line on the shunt coefficients, and the transient-state and steady-state shunt coefficients when the converter station has a short-circuit fault are calculated via the Matlab platform, so the calculation method is simple, feasible and high in calculation speed.
Owner:YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST +1
PSCAD (Power Systems Computer Aided Design) interface and C language based MMC (Modular Multilevel Converter) transient simulation method
InactiveCN105159743ARealize simulationEasy constructionSoftware simulation/interpretation/emulationCapacitor voltageMeasurement point
The invention discloses a PSCAD (Power Systems Computer Aided Design) interface and C language based MMC (Modular Multilevel Converter) transient simulation method. The method comprises: step 1, performing MMC related primary system modeling, performing MMC converter control logic modeling, and setting voltage and current measurement points; step 2, utilizing model components of PSCAD / EMTDC (PSCAD / Electromagnetic Transients including DC) to determine the number of sub-modules used in triggering upper and lower bridge arms in each phase unit of an MMC; step 3, utilizing a C language to construct a capacitor voltage balance control function for the sub-modules; and step 4, utilizing a Fortran language to write a PSCAD / EMTDC interface program, and calling the capacitor voltage balance control function to realize MMC transient simulation. The method is capable of realizing simulation of the MMC and a control function of the MMC, and can be conveniently used for constructing a flexible direct-current transmission simulation system.
Owner:STATE GRID CORP OF CHINA +2
Method for converting algorithm model of PSCAD (power system computer aided design) simulation system to source code
InactiveCN104182590AJoin flexibleVersatileSpecial data processing applicationsGraphicsComputer Aided Design
The invention provides a method for converting an algorithm model of a PSCAD (power system computer aided design) simulation system to a source code. The method for converting the algorithm model of the PSCAD simulation system to the source code includes following steps: building a graphic function library corresponding to a basic function block in the PSCAD simulation system; building a custom function library corresponding to a custom function block in the PSCAD simulation system; uniformly classifying the graphic function library and the custom function library which are built; converting a graphic function block to the source code. The method for converting the algorithm model of the PSCAD simulation system to the source code adopts an operating mode based on a graphical mode, achieves function block graph conversion in one to one correspondence mode and data association conversion in one to one correspondence mode, achieves the purpose that the source code is automatically generated from an algorithm model file, and can compile the source code and then download the source code into a device.
Owner:STATE GRID CORP OF CHINA +1
PSCAD (Power System Computer Aided Design)-based mechanical complex torque coefficient scanning method
InactiveCN103778287AConvenient researchAuto scanSpecial data processing applicationsPower system stability controlComputer Aided Design
The invention discloses a PSCAD (Power System Computer Aided Design)-based mechanical complex torque coefficient scanning method, and belongs to the field of stable control of power systems. The method comprises the following steps: (1) loading a mechanical complex torque coefficient scanning module onto electromagnetic transient software; (2) inputting a generator parameter and an axis coefficient, and establishing an axis motion equation; (3) inputting a scanning parameter; (4) bringing the scanning frequency into the axis motion equation, calculating a mechanical complex torque coefficient under the frequency, and separating the mechanical complex torque coefficient into a real part serving as a mechanical elastic coefficient and a virtual part serving as a mechanical damping coefficient; (5) judging whether the frequency surpasses a cut-off frequency or not, if the frequency does not surpasses the cut-off frequency, adding a scanning step length to the frequency, returning to the step 4), and calculating the mechanical complex torque coefficient of a next frequency point; if the frequency surpasses the cut-off frequency, stopping calculating and finishing scanning. By adopting the PSCAD-based mechanical complex torque coefficient scanning method, the mechanical complex torque coefficient of a generator to be researched and developed on a PSCAD platform can be scanned automatically, a high scanning speed and an accurate result are achieved, and research of the problem of subsynchronous oscillation is facilitated.
Owner:STATE GRID ECONOMIC TECH RES INST CO +1
Modeling method and system for correcting and predicting arc extinguishing angle
InactiveCN102496924BDc network circuit arrangementsPower conversion systemsComputer Aided DesignModel method
Owner:SHANDONG UNIV
Calculation method of distribution line induced overvoltage based on pscad/emtdc
InactiveCN103399190BSuitable for useEasy to determine lightning protection measuresCurrent/voltage measurementOvervoltageEngineering
The invention relates to a calculation method for sensing overvoltage of a power distributing line based on PSCAD (power systems computer aided design) / EMTDC (electromagnetic transients including DC). The method mainly comprises the following steps of establishing a PSCAD / EMTDC circuit model of a power line sensing in a thunderbolt, designing a sensing overvoltage calculation self-definition element, and enclosing the PSCAD / EMTDC circuit model of the power line sensing in the thunderbolt and the sensing overvoltage self-definition element into a model in the PSCAD / EMTDC of the power line sensing in the thunderbolt. By adopting the calculation method, the model is established to more simply and conveniently calculate the sensing overvoltage of the power distributing line, and the analysis is carried out on the sensing overvoltage. According to the calculation method, the defects of an inaccurate experience formula and a complicate figure calculation method are overcome, and the efficiency of analyzing the sensing overvoltage is improved.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Topology analysis method of PSCAD simulation model
InactiveCN111783373AEasy to importCAD circuit designSpecial data processing applicationsComputer Aided DesignAlgorithm
The invention provides a topology analysis method of a PSCAD (Power System Computer Aided Design) simulation model. The method comprises the steps of constructing an element coordinate analysis function, realizing analysis of coordinates of each element in the PSCAD element library, and calculating coordinates of all external connection nodes of the elements by giving reference coordinates and directions; constructing a file information extraction function, reading a PSCAD simulation model file, and extracting element parameters and element actual coordinates used in the model; constructing anelement topology analytic function, summarizing actual coordinates of the elements, defining each coordinate as a node, and obtaining node serial numbers of all external connection nodes of differentelements; and outputting the parameter information and the node serial numbers of all the elements to obtain the parameters of all the elements, obtaining the corresponding positions of different elements through the node serial numbers, and combining the parameter information and the node serial numbers to realize topology analysis of the PSCAD simulation file. According to the method, datamation can be effectively carried out on the PSCAD graphical simulation model, and direct data utilization is facilitated.
Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
Micro-grid multi-objective optimized operation control method
ActiveCN102354974BReduce pollutionEnsure power supply reliabilitySingle network parallel feeding arrangementsOperation modeEngineering
Owner:SHANDONG UNIV
Initializing method of PSCAD (power system computer aided design) customized generator controller
The invention relates to the technical field of transient state simulation of a power system, and discloses an initializing method of a PSCAD (power system computer aided design) customized generator controller. The method includes the processes of confirming a module i to be initialized in a transfer function of a controller, a variable output Yio of the module i, and a reference input Yref0 of the controller; confirming the relationship of an output Yi0 under a stable state and known quantity including input and demand output of the controller; adding a generator variable for initialization; customizing the variables of the initial state and the normal state of the generator and the variable of the module i in the Script, and calculating the output Yi0 of the module i under the initializing state of the generator; after initializing the generator, locking the reference input of the controller. When the generator of the technical scheme is initialized to a stable state, the customized controller also reaches the stable state, thus the initialization of the customized controller is realized.
Owner:SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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