Power Calculation Apparatus for V2G Grid Supply
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Solution Overview
Problem
Conventional power calculation methods fail to accurately determine the amount of power that can be supplied to a power grid due to power loss during transmission, especially in Vehicle to Grid (V2G) systems, where electric vehicles (EVs) transfer energy back to the grid, as they do not consider the position and capacity of the EVs and the associated power loss.
Innovation Solution
A power calculation apparatus and method that specifies the connection point of an energy source, such as an EV, within a power system, acquires its capacity information, and calculates the suppliable power within a predetermined range, taking into account the position and capacity to minimize power loss, thereby ensuring accurate power supply and demand balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power calculation is performed without considering transmission loss, then calculation simplicity is improved, but calculation accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing transmission loss values in a lookup table based on distance from the substation. Instead of performing complex real-time transmission loss calculations, the system pre-processes loss data for various distances and retrieves it during power supplementation calculations, thereby simplifying the calculation process while maintaining accuracy.
Solution Approach 2:
The patent changes the parameter representation by converting continuous transmission loss calculations into discrete distance-based lookup values. The system divides the transmission distance into discrete segments and stores corresponding loss values, transforming a continuous mathematical problem into a discrete parameter lookup operation that is both accurate and computationally efficient.
2Measurement precision
If transmission loss is considered in power calculation, then calculation accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing transmission loss values in a lookup table based on distance from the substation. Instead of performing complex real-time transmission loss calculations, the system pre-processes loss data for various distances and retrieves it during power supplementation calculations, thereby simplifying the calculation process while maintaining accuracy.
Solution Approach 2:
The patent uses copying by creating a lookup table that replicates transmission loss data for different distances. Instead of recalculating loss values during operation, the system copies pre-computed loss data into a readily accessible table structure, allowing fast retrieval and eliminating the need for repeated complex calculations.
3Productivity
If power supplementation is concentrated in specific areas, then supply-and-demand balance in those areas is improved, but power loss increases due to longer transmission distances
Solution Approach 1:
The patent applies local quality by making the power supplementation capability location-dependent. The system calculates and determines the maximum power supplementation amount based on the specific distance from the substation, allowing different supplementation levels in different geographic areas. This ensures that areas closer to the substation can contribute more power while areas farther away contribute less, optimizing the balance between local supply-demand needs and transmission loss.
Data Source
AI summary
A power calculation apparatus calculating an amount of power suppliable to a power system by an energy source connectable, at a connection point, to the power system and capable of power generation and power storing, the power calculation apparatus includes: a microprocessor and a memory connected to the microprocessor, wherein the microprocessor is configured to perform: specifying a position of the connection point of the energy source in connection with the power system; acquiring a capacity information indicating a power generation capacity or a remaining storage capacity of the energy source; and calculating an amount of power suppliable by the energy source to the power system in an area within a predetermined range including the connection point, based on the capacity information and the position of the connection point.