Power Adjustment Device for Grid Load Minimization
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Solution Overview
Problem
Existing power adjustment systems struggle to minimize power consumption from the grid and carbon dioxide emissions, particularly when daily power demands fluctuate or demand response requires specific reductions in power intake from the grid.
Innovation Solution
A power adjustment device and method that includes a prediction and planning module to determine optimal charging and discharging schedules for a power storage apparatus, minimizing grid power intake and carbon emissions by utilizing solar power generation and dynamic unit price adjustments, allowing for flexible planning periods that align with low electricity buying rates and account for surplus power generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If charging/discharging control is performed in units of days with fixed schedules, then the control system is simple and easy to implement, but the system cannot sufficiently achieve the objective when power consumption fluctuates daily or when demand response requires specific period reductions
Solution Approach 1:
The patent applies dynamics by transitioning from fixed daily schedules to flexible planning periods that can be dynamically adjusted based on electricity prices, demand patterns, and generation forecasts. The control system adapts its operation timeline to match varying conditions rather than following a rigid daily cycle.
Solution Approach 2:
The patent changes the time parameter from fixed daily units to variable planning periods that can span different durations. This allows the system to optimize charging/discharging operations over periods that best match economic and operational conditions, whether that's several hours, a full day, or multiple days.
2Quantity of substance
If the power storage apparatus is frequently charged and discharged to minimize grid power intake, then the amount of power from the grid is reduced, but the lifespan of the power storage apparatus decreases
Solution Approach 1:
The patent applies partial action by optimizing the degree and frequency of charging/discharging operations to achieve sufficient grid power reduction without excessive cycles. The system determines the minimum necessary control actions to meet objectives, avoiding unnecessary wear from over-controlling the storage apparatus.
3Quantity of substance
If optimal charging/discharging schedules are determined using complex prediction and planning, then power consumption from the grid is minimized, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by performing predictions of power demand, generation amounts, and electricity prices in advance of the planning period. This allows the control system to prepare optimized schedules beforehand, reducing the need for complex real-time decision-making and simplifying the control architecture.
Solution Approach 2:
The system uses available data and straightforward prediction methods to generate its own control schedules without requiring complex external optimization systems. The prediction and planning functions are integrated into the control device itself, using self-contained algorithms to determine optimal operations.
Data Source
AI summary
A power adjustment device supplies power received from a power grid and power of a storage battery to an electric load in a consumer's facility. Power adjustment device includes a prediction portion, a planning portion, and a controller. Prediction portion obtains a prediction value of demand power that is power to be consumed in the electric load in a planning period, the planning period being a period in which the storage battery is charged and discharges. Planning portion determines a control content of charging of and discharging by the storage battery in the planning period depending on the prediction value of the demand power to minimize any one of an amount of power to be received from the power grid, a compensation for power to be received from the power grid, and an emission amount of carbon dioxide. Controller controls the power conditioner in accordance with the control content.