Supply-Demand Control Device Optimizing Power Procurement Cost
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Solution Overview
Problem
Existing power management systems in smart communities do not effectively minimize the actual power procurement cost due to increased costs from reduced storage-battery lifespan, power-storage losses, and other factors, despite optimizing based on power prices.
Innovation Solution
A supply-demand control device connected through a communication network that estimates future load and power generation, calculates a first evaluation function incorporating power purchase, natural-discharge, storage-battery lifespan, and transmission losses, and adjusts charge-discharge commands to optimize power storage and procurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the storage-battery system is frequently charged and discharged to take advantage of electric rate differences, then power procurement cost is reduced, but storage-battery lifespan decreases
Solution Approach 1:
The system performs preliminary estimation of future load and power generation amounts, and calculates optimal charge-discharge commands in advance by evaluating multiple cost factors including battery lifespan. This allows the system to plan charging/discharging operations that minimize total cost while preserving battery life, rather than making reactive decisions that may harm the battery.
Solution Approach 2:
The evaluation function incorporates feedback from multiple sources including power prices, estimated load, power generation amounts, and battery state. By continuously evaluating the comprehensive cost function that includes battery lifespan cost, the system adjusts charge-discharge commands to balance immediate power cost savings against long-term battery degradation.
2Loss of energy
If the storage-battery system is charged and discharged to arbitrage power prices, then power procurement cost is reduced, but power-storage loss increases
Solution Approach 1:
The system calculates optimal charge-discharge commands in advance by preliminarily estimating future power generation amounts and load requirements. This allows the system to identify optimal opportunities for power arbitrage while accounting for storage losses, rather than making reactive charging/discharging decisions that may result in net losses.
Solution Approach 2:
The evaluation function incorporates power-storage loss as a feedback factor, continuously monitoring the efficiency of charge-discharge operations. By including storage loss cost in the comprehensive evaluation, the system adjusts commands to maximize net benefit after accounting for energy losses during charging and discharging cycles.
3Loss of energy
If optimal operation plan is created based on power price alone, then power procurement cost is reduced, but actual cost increases due to unaccounted factors
Solution Approach 1:
The evaluation function serves multiple purposes simultaneously: it calculates power procurement cost, estimates battery lifespan cost, accounts for power-storage loss, and evaluates transmission loss. This multi-functional evaluation comprehensive cost function provides a unified framework for optimizing power operations while accurately measuring all relevant cost factors.
Solution Approach 2:
The system incorporates feedback from multiple cost sources including power prices, battery lifespan degradation, power-storage losses, and transmission losses. By continuously evaluating the comprehensive cost function that includes all these factors, the system achieves precise cost calculation and adjusts operations to minimize actual total cost.
Data Source
AI summary
A supply-demand control device connected through a communication network to a charge-discharge control device to control charge and discharge of a power storage device connected to a power distribution line in a power distribution system managed by a community, the supply-demand control device including a load and power-generation-amount estimation unit to estimate a load and a power generation amount as a planned load and power generation amount; a first-evaluation-function calculation unit to calculate a value of a first evaluation function, which is a sum of a power purchase cost, a natural-discharge loss cost, a storage-battery life-span cost, a power-transmission loss cost, and a charge-discharge loss cost; a planned charge-discharge command calculation unit to calculate the charge-discharge command amount by which the first evaluation function is minimized; and a power-purchase plan output unit to create a power purchase plan based on the charge-discharge command.