59 results about "Power systems computer aided design" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

The invention discloses a transformer electromagnetic transient simulation modeling method based on PSCAD/EMTDC (power system computer aided design/ electromagnetic transients including DC) software. The method comprises the following steps of (1) creating a variable inductance element control model in a Graphic window of PSCAD/EMTDC; (2) creating a user parameter input interface in a Parameters window; (3) respectively compiling data preprocessing codes, hysteresis main loop cluster fitting codes and hysteresis sub loop cluster fitting codes in Computer and DSDYN segments of a Script window, and outputting an inductance value for controlling the variable inductance element; (4) building a nonlinear inductance element test model for describing hysteresis characteristics of ferromagnetic materials in a main window, building a model with the same system parameters in ATP-EMTP (alternative transients program-electromagnetic transients program) software, and performing simulation and result comparison; (5) connecting a nonlinear inductance element to the high-voltage side of a UMEC (unified magnetic equivalent circuit) transformer model in parallel in the main window, forming a transformer electromagnetic transient simulation model considering the hysteresis characteristics, and performing simulation result comparison in a manner like that in the step 4. The transformer electromagnetic transient simulation modeling method overcomes the defect that a transformer only considers saturation characteristics but does not consider the hysteresis characteristics in the PSCAD/EMTDC.

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.

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.

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.

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.

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.

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.

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.