Distributed PV Regulation With Safety Verification for Reverse Power Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Distributed photovoltaic systems cause reverse power flow, leading to overload in main transformers and lines, affecting grid flexibility and security, especially in regions with high new energy resources and concentrated solar and wind power generation.
Innovation Solution
A distributed photovoltaic regulation method and system that performs safety verification, including calculating load rates, decomposing regulation amounts, and using hierarchical collaborative control to manage power balance and flow over-limit, with modules for resource aggregation and automatic generation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed photovoltaic systems are connected on a large scale in concentrated areas, then new energy resources are utilized more effectively, but reverse power flow causes overload in main transformers and lines, affecting grid security
Solution Approach 1:
The patent divides the distributed photovoltaic system into multiple aggregation units, each equipped with independent control capabilities. This segmentation allows for localized regulation of power flow, preventing reverse overload while maintaining overall system productivity. The aggregation units can be controlled independently to manage power distribution across different grid segments.
Solution Approach 2:
The patent implements a feedback control mechanism that continuously monitors power flow conditions and adjusts the operation of distributed photovoltaic aggregation units accordingly. When reverse power flow or overload conditions are detected, the system automatically regulates the output of aggregation units to maintain grid security while preserving new energy utilization.
2Reliability
If distributed photovoltaic systems are regulated to prevent reverse overload, then grid security is improved, but control complexity increases due to multi-scenario regulation requirements
Solution Approach 1:
The patent designs a universal control framework that handles multiple regulation scenarios (power balance, flow over-limit, voltage deviation) through a unified safety verification mechanism. This multi-functional approach simplifies control complexity by providing a single standardized process that adapts to different grid conditions, rather than requiring separate control systems for each scenario.
Solution Approach 2:
The patent performs safety verification and calculates regulation amounts in advance before actual regulation execution. By pre-assessing grid conditions and determining appropriate regulation strategies, the system reduces real-time control complexity and enables faster response to multi-scenario regulation requirements while maintaining grid security.
3Measurement precision
If safety verification is performed for distributed photovoltaic control, then precise control is achieved, but calculation and decomposition of regulation amounts increases computational burden
Solution Approach 1:
The patent segments the calculation and decomposition process into hierarchical levels, first determining total regulation amounts at the aggregation unit level, then decomposing these amounts to individual photovoltaic units. This segmented approach enables precise control while reducing computational burden by breaking down complex calculations into manageable stages that can be executed efficiently.
Solution Approach 2:
The patent performs safety verification and preliminary calculations of regulation amounts before final decomposition and execution. This preliminary action allows the system to pre-determine safe operation boundaries and regulation strategies, reducing the computational burden during real-time control while maintaining high precision in the final regulation outcomes.
Data Source
AI summary
A distributed photovoltaic regulation method considering safety verification includes acquiring power transmission or power substation equipment limit value, load condition, and distributed photovoltaic aggregation information under equipment, calculating load rate of equipment, calculating total maximum regulation amount or the total over-limit correction amount of distributed photovoltaic power under equipment based on the load rate of equipment and a threshold value, and decomposing total maximum regulation amount or total over-limit correction amount to obtain respective total maximum regulation amount or total over-limit correction amount of each load point; and decomposing respective total maximum regulation amount or total over-limit correction amount of each load point to obtain respective maximum regulation amount or over-limit correction amount of each automatic power generation control unit, correcting respective regulation requirement and generating respective regulation target of each automatic power generation control unit, and sending respective regulation target to each automatic power generation control unit for execution.