Voltage Distribution Estimation Using Sensor Data
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Solution Overview
Problem
Existing power distribution system state estimation methods, such as those described in Patent Literature 1, often result in significant estimation errors due to the use of preset power system data, leading to inaccuracies in voltage distribution calculations.
Innovation Solution
A power distribution system state estimation device that includes a communication unit for receiving measurement values from high-voltage sensors and smart meters, and a state estimation unit that sections the power distribution line to estimate voltage distribution based on these measurements, allowing for accurate estimation of solar power generation without increasing the number of measurement or communication devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If preset power system data is used for voltage distribution calculation, then the calculation process is simplified, but the estimation accuracy significantly deteriorates
Solution Approach 1:
The patent changes the parameters used in calculation from static preset data to dynamic measured values. By using real-time voltage and power flow measurements from sensors along with smart meter data, the system adapts parameters to actual system conditions, thereby improving estimation accuracy while maintaining calculation feasibility through established power flow equations.
Solution Approach 2:
The patent implements feedback by incorporating measured values from high-voltage sensors and smart meters into the voltage distribution calculation. The measured power flow and voltage data feed back into the calculation process, allowing the system to continuously update and refine voltage distribution estimates based on actual system state, thus resolving the accuracy issue.
2Measurement precision
If more measurement devices are installed to improve estimation accuracy, then the voltage distribution can be estimated more precisely, but the system complexity and cost increase
Solution Approach 1:
The patent makes existing measurement devices serve multiple functions. High-voltage sensors originally designed for voltage monitoring are also utilized for power flow measurement, and smart meters provide both consumption data and generation data. This multi-functionality allows accurate state estimation without adding dedicated measurement devices for each parameter.
Solution Approach 2:
The patent merges data from multiple sources including high-voltage sensors, smart meters, and power management systems into a unified state estimation framework. By combining these existing data streams and coordinating their use through centralized processing, the system achieves high estimation accuracy without requiring separate dedicated devices for each measurement function.
Data Source
AI summary
The power distribution system management device according to the present invention includes a communication unit that receives measurement values from a plurality of high-voltage sensors that each measure a voltage and a power flow of a power distribution line in a high-voltage system, and receives, from a plurality of smart meters that each measure an amount of power, information on the amount of power; and a voltage control unit that sections the power distribution line between two high-voltage sensors among the plurality of high-voltage sensors into a plurality of sections to estimate a voltage distribution along the power distribution line based on two of the measurement values received from the two high-voltage sensors and on the amount of power of each of the sections.