Applicable Power Flow Calculation Method in Rotor Angle Control Mode

Abstract

The invention discloses a power flow calculation method available after applying rotor angle control (RAD control) to a power grid. The calculation steps are as follows: First, while inputting the known data of the traditional power flow, input the internal node angle reference and active power reference of the generator. The variables are then initialized and the generator internal node angles are set as angle references. Then iterative calculation is started to calculate the active and reactive deviations of each node, and the active power injection of the nodes in the RAD generator should be added with the correction amount obtained according to the angle deviation. Then calculate the Jacobian matrix, in which the partial derivative of the active power of the RAD generator to the angle is compared with the traditional power flow, and the proportional gain of the rotor angle controller needs to be multiplied by the rated capacity of the generator. Then use Newton's method to obtain the voltage / amplitude correction value of each node and the new node voltage / amplitude to complete an iteration. The aforementioned iterations are repeated until the active / reactive power deviation of each node is less than the preset threshold, and the power flow calculation can be completed.

Description

technical field [0001] The invention relates to the field of power system analysis and control, in particular to a power flow calculation method applicable in a rotor angle control mode. Background technique [0002] The power system has been using a combination of decentralized primary frequency regulation and centralized automatic generation control (AGC, including secondary frequency recovery and tie-line control, etc.) to control the active power of generation. After adopting renewable energy such as wind and light for power generation, this model will continue to be used. However, as the scale of the grid becomes larger and larger, this model encounters new problems. For example, there have been many ultra-low frequency oscillation events caused by the instability of the primary frequency modulation process in the actual system, which are significantly different from the traditional low frequency oscillation in mechanism and performance. In addition, AGC's tie-line ad...

AI Technical Summary

Problems solved by technology

Due to different active power tracking mechanisms, traditional power flow algorithms are no longer applicable

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