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.

Automatic conversion method for converting PSASP (Power System Analysis Software Package) data model into PSCAD (Power System Computer Aided Design) data model

The invention relates to a receiving-end power grid power supply planning method considering extra-high-voltage direct current access. According to the method, on the basis of working out an extra-high-voltage direct current power transmission system and a receiving-end power grid power supply construction system, and correlation degrees of indexes in the two systems, main factors, influencing power supply construction planning in a province, of the extra-high-voltage direct current power transmission system are analyzed; by combination with a conventional power supply planning method, an objective function and a constraint condition are established by taking the main factors as the core and by taking optimal overall social benefit as the principle; a receiving-end power grid power supply planning model considering the extra-high-voltage direct current access is established; and by solving the model, a required power supply planning scheme can be obtained.

Receiving-end power grid power supply planning method considering extra-high-voltage direct current access

The invention discloses a circuit variable quantity failure direction judgment method and device adapting to UPFC connection. The method includes the steps that injecting voltages of a series transformer before and after a failure are obtained, and variable quantities of the injecting voltages are calculated; additional components, generated in protective voltage and current changes, of the injecting voltages are calculated; a protective voltage variable quantity and a protective current variable quantity which are generated after influences of the additional components are eliminated are calculated; based on the protective voltage variable quantity and the protective current variable quantity which are generated after influences of the additional components, according to preset resistancephase angle variable quantity threshold value ranges corresponding to different failure directions, the failure direction of the current failure is judged. By collecting the variable quantities of the injecting voltages of the series transformer in real time, the influences on variable quantity direction elements are eliminated, and accordingly the reliability of judgment on the failure directionof a variable quantity is guaranteed.

Circuit variable quantity failure direction judgment method and device adapting to UPFC connection

The invention provides an accurate flow calculation method for distributed wind power integration distribution networks. The method comprises the following steps of: S1, acquiring power grid data, wind turbine generator data, wind power plant wind direction and wind speed data; S2, determining a determination relationship among the wind direction, a wind speed and a temperature according to an FPIatmospheric wind speed and temperature basic principle, so as to correct resistance; S3, importing probability density models of the wind direction and the wind speed; and S4, carrying out accurate flow calculation by utilizing the corrected resistance value and applying the probability density models of the wind direction and the wind speed to flow distribution calculation. The method is capableof providing accurate probability flow calculation for distributed wind power integration distribution networks, considering the integration characteristics of distributed wind power, and realizing an accurate probability flow algorithm for the distributed wind power integration distribution networks through obtaining data of the wind power plant wind speed and wind direction and the probabilitydensity models. The method is capable of solving the problem that the wind speed is uncertain in the prior art, realizing accurate calculation of flow distribution and improving the calculation accuracy.

Accurate flow calculation method for distributed wind power integration distribution networks

The invention discloses a parameter setting method for a double-closed-loop vector control PI regulator of a permanent magnet synchronous motor. A current inner loop system is corrected into a first-order system by utilizing a pole-zero cancellation principle in a current loop closed-loop transfer function; a proportional coefficient and an integral coefficient of a current loop PI regulator are obtained through the current loop closed-loop transfer function; when two constraint conditions of enabling the slope at a cut-off frequency of a speed loop open-loop transfer function to be -20 dB/decand obtaining the maximum phase angle margin are met, a proportional coefficient and an integral coefficient of a speed loop PI regulator are determined; and parameters of the speed loop PI regulatorare obtained. An automatic control related theory is combined, and a theoretical basis is provided for setting the PI parameters; change relations between the PI parameters, and a motor parameter-current loop bandwidth and a system performance index-damping factor are revealed; the PI parameters can be set for different motor systems more flexibly and accurately; and therefore, the universality is high.

Parameter setting method for double-closed-loop vector control PI regulator of permanent magnet synchronous motor

The invention discloses an optimal configuration method for fault current limiters. An area with high risk of failure in simultaneous phase commutation is judged by using a multi-infeed DC interactionfactor. During the configuration of an SRFCL device, the average electrical distance from a current limiting node to the DC converter stations in the area with high risk of failure in simultaneous phase commutation is calculated, and the priority of the current limiting node is determined to avoid large-range search. Meanwhile, the suppression effect of SRFCL on DC commutation failure is considered. Therefore, an SRFCL optimal configuration scheme taking both short-circuit current limiting and commutation failure suppressing into account is realized. The method is helpful for power system planners to grasp the influence of SRFCL installation and configuration on the phase commutation failure of a multi-infeed DC system and visually determine an SRFCL installation area. The indexes in thearea can be displayed in order during calculation. The method is easy to implement. Decision support is provided for the optimal configuration method of SRFCL in the multi-infeed DC system.

Optimal configuration method for fault current limiters

The invention discloses a method for calculating direct current access capability of a receiving end power grid with consideration of multiple constraints, belonging to the technical field of electric power system and automation thereof. The method for calculating direct current access capability of a receiving end power grid with consideration of multiple constraints comprises: determining an alternative direct current drop point set according to the station address condition of a transformer station, electric power balance and the like; determining newly increased direct current access drop points according to the short circuit capacity of each alternative direct current drop point in the typical mode and the interaction degree between each direct current in the typical mode; and giving the direct current access capability of a receiving end power grid through iteration after integrated consideration of multiple constraints comprising the direct current multi-infeed short circuit ratio, the power grid low ebb peak load regulation capacity, the relative moment of inertia index, the N-1 transient stability and the like. The method for calculating direct current access capability of a receiving end power grid with consideration of multiple constraints is beneficial to guidance of a power grid planning department about reasonable planning of the direct current drop points of the receiving end power grid, and can give the reasonable level for the direct current access capability of the receiving end power grid and reduce the blindness for direct current construction, and can improve the power grid operation control level.

Method for calculating direct current access capability of receiving end power grid with consideration of multiple constraints

The invention discloses a coordination control method considering virtual synchronous generator access for power grid safety and stability and belongs to the technical field of a power system and automation thereof. The method comprises the following steps: a new energy collection station control substation calculates actual regulation amount of each virtual synchronous generator according to up-sent information of a virtual synchronous generator execution station, if the total amount of the actual regulation amounts of the virtual synchronous generators is smaller than a total amount specified in an emergency regulation instruction issued by a safety and stability control system master station, the new energy collection station control substation sends an additional control request to a generator tripping load shedding control substation, and the generator tripping load shedding control substation implements additional control. According to the method, control of the virtual synchronous generators is introduced into the safety and stability control system, when the safety and stability control system detects a fault, an offline control strategy is corrected by considering regulable regulation capacity and sensitivity difference of the virtual synchronous generators, and cost of conventional safety and stability control is reduced.

Coordination control method considering virtual synchronous generator access for power grid safety and stability

The invention discloses a practical conversion method for a proportion-integration-differentiation (PID) correction link in a generator excitation system model, and belongs to the technical field of power system modeling. According to the conversion method, the generator excitation system model defined by PSD-BPA, fast analysis of stability using the extended equal area criterion and simulation technologies (FASTEST) or power system analysis software package (PSASP) software can be converted into a corresponding excitation model defined by the IEEE Std 421.5-2005 standard. Compared with other methods, the amplitude-frequency characteristic of an original excitation system model can be accurately simulated under the premise that the model self-definition function of target software does not need to be grasped; the complicated process of building a self-defined model in the target software is avoided; and the model conversion efficiency is effectively improved on the basis of ensuring the credibility of data conversion and simulation analysis results.

Conversion method for proportion-integration-differentiation (PID) correction link in generator excitation system model

The invention discloses a thermal power generating unit primary frequency modulation performance assessment index calculation method and system. The method comprises the following steps: calculating an additional weight coefficient of an integral electric quantity according to related electric quantity information of the system; According to the additional weight coefficient, calculating the integral electric quantity of the primary frequency modulation actual increase output of the primary frequency modulation unit and the integral electric quantity of the primary frequency modulation theoretical increase output; And calculating a primary frequency modulation performance assessment index value of the set based on the integral electric quantity of the primary frequency modulation actual increase output and the integral electric quantity of the primary frequency modulation theory increase output. According to the method, the primary frequency modulation performance of the thermal powergenerating unit is examined after power disturbance fault disturbance of the system, a grid-connected power plant can be stimulated to improve the primary frequency modulation capability of the unit,rapid change of frequency is inhibited, and rapid recovery of supporting frequency is supported.

A thermal power generating unit primary frequency modulation performance assessment index calculation method and system

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