Energy Management System for Grid Load Smoothing
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Solution Overview
Problem
Existing methods for demand response in electric power management, such as ON/OFF switching of energy storage devices, are inefficient in achieving demand-supply balance due to limited combinations and resulting unevenness in grid load curves, especially with increasing renewable energy sources.
Innovation Solution
An energy management system that predicts grid load variations and sets operational energy values for energy storage devices between minimum and maximum rated outputs to minimize load differences, allowing continuous charging and discharging to stabilize demand-supply balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ON/OFF switching control is used for energy storage devices, then the control method is simple, but the demand-supply adjustment efficiency is low and load curve unevenness increases
Solution Approach 1:
The patent changes the control parameter from binary ON/OFF switching to continuous output ratio control (0-100%). The control device calculates the difference between actual and predicted load values, then determines the output ratio of each energy storage device based on this difference, enabling fine-grained adjustment of charge/discharge power to efficiently flatten load curves while maintaining operational simplicity.
2Device complexity
If ON/OFF switching control is used for energy storage devices, then the control system is simple, but the load curve becomes uneven
Solution Approach 1:
The patent transitions from discrete ON/OFF states to continuous output ratio parameters (0-100%), allowing the energy storage devices to operate at any level between complete shutdown and full power. This continuous parameter control enables smooth load curve adjustment, eliminating the stepped pattern caused by binary switching while keeping the control system relatively simple through centralized calculation and distribution of control signals.
3Quantity of substance
If renewable energy generation is increased, then green energy supply is improved, but demand-supply balance becomes difficult to achieve
Solution Approach 1:
The patent implements a feedback control mechanism where the control device continuously monitors the actual load value, compares it with the predicted load value, calculates the difference, and adjusts the output ratios of energy storage devices accordingly. This closed-loop feedback system dynamically compensates for the variability of renewable energy generation, maintaining demand-supply balance even as renewable energy penetration increases.
Data Source
AI summary
An object of the present invention is to set a demand schedule for performing highly efficient demand-supply adjustment of electric power, to deal with electric power demand. To achieve the object, an energy management apparatus of the present invention is an energy management apparatus for performing demand-supply adjustment of electric power by use of a plurality of chargeable and dischargeable energy storage devices, comprising: a plan management means for acquiring a variation of a load of an electric power grid predicted during a target period; and a demand variation setting means for setting a value of an operational electric energy for charging and discharging of each of the plurality of energy storage devices to be a value corresponding to a halt state or a value between a minimum rated output and a maximum rated output, in a manner to make a difference between maximum and minimum values of the load be smaller than a difference that is predicted, by operation of the plurality of energy storage devices.