DC power fluctuation simulation method suitable for PSASP

Abstract

The invention relates to the technical field of electric power system simulation and particularly relates to a DC power fluctuation simulation method suitable for PSASP. The method is characterized bycomprising steps that the PSASP is utilized to calculate the power flow in a normal operation state, and the DC power of a DC system is determined; the DC system is replaced with a constant load; animpact load is added, and an impact load power value is set, specifically, the impact load is added at an inverter station commutation bus, a disturbance type is selected as an impact load, the addedimpact load is selected, and active and reactive values of the impact load are set according to known data having DC output power fluctuation characteristics required by a user; the reactive compensation cutoff order is set; simulation calculation is performed, and the DC power required by the user is outputted. The method is advantaged in that the DC output power fluctuation characteristics required by the user can be accurately simulated, and operation is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of power system simulation, in particular to a DC power fluctuation simulation method suitable for PSASP. Background technique [0002] High-voltage direct current transmission (HVDC) has the advantages of large transmission capacity, small transmission loss, and long transmission distance, so it develops very rapidly. Due to the large transmission capacity of DC transmission, when it is subjected to a large disturbance, its output power will fluctuate greatly; therefore, the research on the interaction effect of AC and DC is very necessary for the safe and stable operation of the power grid. [0003] The existing DC system models with DC fault simulation capability include electromagnetic transient model and quasi-steady model. The electromagnetic transient model can simulate the dynamic characteristics of DC in detail, but the simulation scale is small, and it is not suitable for the simulation of large-s...

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Problems solved by technology

The electromagnetic transient model can simulate the dynamic characteristics of DC in detail, but the simulation scale is small, and it is not suitable for the simulation of large-scale actual power grids; while the quasi-steady model can completely retain the scale of the AC system, so it is widely used in electromechanical transient simulation programs. However, it is not accurate enough; considering that the operation and dispatch of the actual power grid is usually based on the electromechanical transient simulation program PSASP, and now the DC system in PSASP uses a quasi-steady-state model, which cannot well simulate the DC system under disturbance. Output power characteristics, the simulation results are quite different from the user's requirements; at the same time, although there are custom modules in PSASP, it is too complicated to redefine the DC model to consider many aspects under static and transient conditions

[0004] Therefore, if the user has a set of accurate known data (such as the measured data collected from WAMS, or the electromagnetic transient simulation data obtained from PSCAD), which has the DC output power fluctuation characteristics required by the user, but wants to It is very difficult to put it into PSASP for simulation calculation

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