Power Flow Correction for Multi-Source Reverse Feed Measurement
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Solution Overview
Problem
In power management systems involving solar cells, fuel cells, and power storage, there are discrepancies in measuring output power from adjustment power supplies and reverse power flow due to differences in measurement entities and sensor placement challenges, leading to inaccuracies in power grid stabilization.
Innovation Solution
A power management system with a controller that receives information from base power meters and individual power meters to execute a correction process, specifying individual reverse power flows of adjustment power supplies by adjusting for discrepancies based on output powers, using various criteria such as ratio, feed-in tariff, natural energy, communication connection, environmental load, and priority for load devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual sensors are provided for measuring the output power of each adjustment power supply, then measurement precision is improved, but device complexity and installation difficulty increase due to the requirement of disposing sensors closer to the base power meter side than the connection point between adjustment power supply and intra-facility wiring
Solution Approach 1:
The patent introduces a power management apparatus as an intermediary entity that receives output power information from adjustment power supplies and reverse power flow information from the base power meter. This mediator performs calculations to determine individual reverse power flows without requiring physical sensors to be installed in difficult positions, thus resolving the contradiction between measurement precision and installation complexity
Solution Approach 2:
The patent replaces the mechanical/physical sensor installation approach with an information processing approach. Instead of physically disposing sensors at specific locations in the wiring, the system uses communication networks to transmit power data and uses computational methods (correction processes) to derive accurate measurements, eliminating the installation complexity while maintaining measurement accuracy
2Ease of operation
If output power of each adjustment power supply is measured by PCS included in each adjustment power supply, then ease of operation is improved, but measurement precision deteriorates because the sum of individual output powers does not match the reverse power flow when load devices are provided in the facility
Solution Approach 1:
The patent implements a feedback mechanism where the power management apparatus receives both the sum of individual output powers from adjustment power supplies and the actual reverse power flow measurement from the base power meter. It then performs correction processes using this feedback information to calculate accurate individual reverse power flows, resolving the discrepancy caused by load device consumption
Solution Approach 2:
The power management apparatus acts as an intermediary that reconciles the difference between PCS measurements and base power meter measurements. It receives data from both sources, performs correction calculations considering load device consumption, and determines accurate individual reverse power flows without requiring changes to the existing PCS measurement system
3Adaptability or versatility
If different entities measure the output power of adjustment power supplies and the reverse power flow, then adaptability is improved, but measurement precision deteriorates due to performance differences between these entities
Solution Approach 1:
The patent applies parameter changes by introducing correction factors and correction processes that adjust the raw measurement data from different entities (PCS and base power meter). The power management apparatus modifies the measurement parameters through mathematical corrections to compensate for performance differences between measurement entities, achieving consistent and accurate results while maintaining the adaptability of having multiple measurement sources
Data Source
AI summary
A power management system includes a first receiver for receiving information specifying reverse power flow from a base power meter measuring at least the reverse power flow output from a facility to a power grid, a second receiver for receiving information specifying each of individual output powers of two or more adjustment power supplies provided in the facility, and a controller for specifying each of individual reverse power flows of the two or more adjustment power supplies managed as the reverse power flow. The controller specifies individual reverse power flows of the two or more adjustment power supplies, by executing a correction process of correcting a discrepancy between a sum of the individual output powers of the two or more adjustment power supplies and the reverse power flow based on the individual output powers of the two or more adjustment power supplies.