ATC Calculation With Reactive Power Support and Voltage Regulation
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Solution Overview
Problem
Existing methods for available transfer capability (ATC) calculation in power systems lack a deep understanding of reactive power distribution and optimization, leading to unbalanced reactive power supply and inadequate utilization of regulative resources, which affects the precision of ATC calculation and economic benefits in power transactions.
Innovation Solution
An ATC calculation method that integrates continuation power flow with reactive power optimization, incorporating adjustments to shunt capacitors, transformer taps, and generators, using mixed integer linear programming to optimize reactive power support and solve power flow equations, ensuring precise evaluation of ATC and efficient power transactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional power flow model is used for ATC calculation, then calculation process is simple, but reactive power distribution is unbalanced and inadequately supplied leading to inaccurate ATC results
Solution Approach 1:
The patent merges continuation power flow calculation with reactive power optimization into a unified calculation framework. The reactive power optimization module is integrated within the continuation power flow process, allowing simultaneous consideration of both active power transfer capability and reactive power support. This integration resolves the contradiction by combining simple continuation power flow with reactive power optimization to achieve accurate ATC calculation without excessive complexity.
Solution Approach 2:
The patent dynamically adjusts reactive power parameters (voltage magnitude, reactive power injection) during the continuation power flow calculation. By changing these parameters iteratively based on the operating state, the system maintains accurate ATC calculation across different load conditions. This parameter adjustment approach improves measurement precision while managing model complexity through systematic optimization.
2Productivity
If reactive power optimization is integrated into ATC calculation, then regulative resources are fully utilized, but calculation complexity increases
Solution Approach 1:
The patent segments the calculation procedure into distinct modules: power flow calculation, reactive power optimization, continuation power flow, and ATC calculation. Each module handles specific aspects of the problem independently, making the overall complex calculation manageable. The reactive power optimization is segmented as a separate optimization problem within the continuation power flow framework, allowing systematic solution while maintaining clarity in the calculation procedure.
Solution Approach 2:
The patent implements feedback mechanisms where the reactive power optimization results feed back into the continuation power flow calculation, and the ATC calculation uses updated reactive power support information. This feedback loop allows the system to iteratively improve regulative resource utilization while managing complexity through structured iterative optimization processes.
3Measurement precision
If system load is increased to reach transfer limit, then ATC calculation is obtained, but voltage level declines and reactive power becomes unbalanced
Solution Approach 1:
The patent performs preliminary reactive power optimization before reaching the transfer limit. By proactively adjusting reactive power support and voltage levels during the continuation power flow process, the system prevents voltage collapse and maintains stability while accurately calculating ATC. This preliminary action approach ensures that voltage stability is maintained throughout the calculation process rather than being addressed only when problems arise.
Data Source
AI summary
An available transfer capability calculation method and system considering reactive power support includes: modeling and solving of power flow equations; establishment of reactive power optimization model based on mixed integer linear programming. Power system voltage regulation consisting of adjusting reactive power injection of generators, changing transformer taps and switching capacitors is included. The object of reactive power optimization is to get best voltage support by adjusting three types of control variables: adjusting reactive power injection of generators, changing transformer taps and switching capacitors. Available transfer capability is solved based on continuation power flow. In this invention, optimized adjustment of regulative resources like shunt capacitors, transformer taps and generators are comprehensively included in the process that power flow status gets close to transfer boundary.