Power System Dispatch Using Successive Linear AC-DC Segmentation
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Solution Overview
Problem
Current economic dispatch methods in power systems face challenges in achieving high calculation accuracy, efficiency, and convergence while considering reactive power and voltage, particularly due to the non-linear nature of AC optimal power flow models and the limitations of DC power flow models that ignore reactive power and voltage.
Innovation Solution
A dispatch method for power systems that establishes an optimal power flow model using a successive linear method, updates power flow equation constraints in each iteration, and employs AC feasibility correction to ensure accuracy and safety, minimizing total cost of active and reactive power production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DC power flow model is used for economic dispatch, then calculation efficiency is improved, but calculation accuracy deteriorates due to ignoring reactive power and voltage
Solution Approach 1:
The patent segments the economic dispatch problem into two parts: active power dispatch using DC power flow for efficiency, and reactive power/voltage dispatch using AC power flow for accuracy. This segmentation allows each sub-problem to be solved with the most appropriate model, resolving the contradiction between efficiency and accuracy.
Solution Approach 2:
The patent changes the modeling parameters by introducing a unified mathematical framework that transforms the AC optimal power flow model into a form that reduces non-convexity and non-linearity. This allows the model to maintain AC accuracy while improving computational tractability, effectively resolving the accuracy-efficiency trade-off.
2Measurement precision
If AC optimal power flow model is used considering reactive power and voltage, then calculation accuracy is improved, but calculation efficiency deteriorates due to non-linear characteristics
Solution Approach 1:
The patent applies parameter changes by transforming the AC optimal power flow model to reduce non-convexity and non-linearity through unified mathematical formulation. This transformation maintains the accuracy benefits of AC modeling while significantly improving computational efficiency and convergence properties.
Solution Approach 2:
The patent applies local quality by using different modeling approaches in different parts of the solution space: DC power flow for active power components where efficiency is critical, and AC power flow for reactive power and voltage components where accuracy is critical. This localized approach optimizes overall performance.
3Device complexity
If conventional economic dispatch methods are used, then device complexity is reduced, but convergence performance deteriorates
Solution Approach 1:
The patent changes the mathematical parameters of the optimization model by unifying the formulation and reducing non-convexity, which fundamentally improves convergence behavior. This allows the use of efficient optimization algorithms to converge reliably to optimal solutions, resolving the contradiction between simplicity and convergence.
Data Source
AI summary
A dispatch method and device for a power system are provided. The method includes: establishing an optimal power flow model, the optimal power flow model includes an objective function and constraints, the objective function is configured to indicate a minimum total cost of active power production and reactive power production of generators; solving the optimal power flow model to obtain dispatch parameters for the power system; and dispatching the power system based on the dispatch parameters.