Renewable Energy Storage Control Device Preventing Grid Reverse Flow

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Solution Overview

Problem

Renewable energy power generation systems face challenges in preventing reverse flow into commercial power grids, leading to shutdowns on holidays due to excess energy production, which reduces electricity rates and carbon dioxide emission benefits.

Innovation Solution

A renewable energy power generation and storage control device that includes power generation units, converters, detecting units, and control units to manage power output, storage, and demand, ensuring generated power is consumed on-site or stored, preventing reverse flow into the grid.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If renewable energy power generation is increased to maximize self-consumption and storage, then electricity rate reduction and carbon dioxide emission reduction are improved, but reverse flow into the commercial power grid occurs when generation exceeds on-site demand and storage capacity

Engineering Contradiction:

Improvecarbon dioxide emission reductionVSAvoidreverse flow into commercial power grid

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The control device continuously monitors the state of charge of the storage battery and the amount of renewable energy generated, using this feedback information to dynamically adjust power generation control. When the storage battery reaches full charge, the system receives feedback and automatically reduces or stops power generation to prevent reverse flow into the commercial power grid.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The storage battery acts as an intermediary between renewable energy generation and the commercial power grid. It absorbs surplus energy when generation exceeds on-site demand, preventing direct reverse flow into the grid while allowing continued operation of renewable energy systems at maximum capacity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If renewable energy power generation is performed to the fullest extent possible, then energy conservation and electricity rate reduction are achieved, but power generation must be suspended on holidays when on-site load is low

Engineering Contradiction:

Improverenewable energy power generation outputVSAvoidenergy conservation benefit

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The storage battery is charged in advance during periods of high on-site demand when renewable energy generation can be fully utilized. This preliminary charging action allows the system to store energy before low-demand periods occur, enabling continuous maximum power generation without suspension even on holidays.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The storage battery enables continuous renewable energy power generation by providing a destination for surplus energy during low-demand periods. Instead of suspending generation when on-site load is low, the system continuously generates energy and stores it in the battery, maintaining uninterrupted useful action.

Inventive Principle:

Principle #20Continuity of useful action

3Loss of energy

If storage battery charging is prioritized to maximize renewable energy utilization, then electricity rate reduction is improved, but charging time and duration are limited

Engineering Contradiction:

Improveelectricity rate reductionVSAvoidcharging time

Core Design Contradiction:

Loss of energyVSDuration of action of moving object

Solution Approach 1:

The control device operates the storage battery in periodic cycles of charging and discharging. During periods when renewable energy generation exceeds on-site demand, the battery charges; during periods when demand exceeds generation, the battery discharges. This periodic action maximizes electricity rate reduction while managing charging time constraints.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20210075216A1Renewable energy power generation and storage control device for reverse flow prevention type self-consumption

Publication Date: 2021.03.11 MATSUO CONSTR

AI summary

A control device including a power generation amount detector, a flow detecting unit which detects an amount of flow power and outputs the flow power amount as a flow signal, a flow control unit which compares a preset target value with the flow signal and outputs a flow operation amount, a power generation control unit which outputs an amount of generated power, an instantaneous power transmitter which detects instantaneous power and outputs the instantaneous power as an instantaneous power signal, a demand control unit which outputs a demand operation amount, and a setting value calculating unit which obtains a demand target value, outputs the demand operation amount according to the result of a comparison of the demand target value with the instantaneous power signal, and determines whether to change a setting value according to the amount of power being output from the power conditioner for power generation.