Local Control System for Power Storage Device Reinjection Prevention

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Solution Overview

Problem

Existing power storage device control systems for consumer terminals do not account for local power production and do not prevent the reinjection of stored power into the distribution network, leading to disconnection risks and lack of interest in reinjection due to unremunerated power discharge.

Innovation Solution

A local control system that manages the charge and discharge of power storage devices based on consumer equipment power consumption and local power production, ensuring that power is not reinjected into the network by maintaining consumption greater than discharge, and adapting commands to prevent disconnection and optimize energy use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If the power storage device discharges power into the distribution network, then the stored power can be utilized by other consumers, but the consumer terminal may be disconnected from the network or the reinjected power cannot be remunerated

Engineering Contradiction:

Improveutilization of stored powerVSAvoidconnection stability to distribution network

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The local control system continuously monitors the instantaneous power consumed by consumer equipment and the discharge power of the power storage device. It uses this feedback information to dynamically adjust the discharge command, ensuring that consumer equipment consumption remains greater than discharge power, thereby preventing network disconnection while maximizing stored power utilization.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system serves itself by using the power storage device to first supply its own consumer equipment before any excess power is discharged to the network. This self-service approach ensures that the terminal's own needs are met first, preventing disconnection risks while allowing surplus power to be reinjected when appropriate.

Inventive Principle:

Principle #25Self-service

2Productivity

If the consumer terminal reinjects power into the distribution network, then other consumers can benefit from the stored power, but the discharged power is not counted by local meter production and cannot be remunerated

Engineering Contradiction:

Improvepower utilization efficiencyVSAvoidremuneration information for discharged power

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The system prioritizes using stored power for the terminal's own consumer equipment before considering discharge to the network. This preliminary action ensures that the terminal maximizes its own benefit from stored power, and only discharges to the network when it would not compromise its own power needs or contractual obligations.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If the local control system increases discharge power to maximize stored power utilization, then more power can be reinjected into the network, but the instantaneous power consumed by consumer equipment may become less than discharge power causing disconnection

Engineering Contradiction:

Improvepower reinjection rateVSAvoidoperational continuity of consumer terminal

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The discharge power is made dynamic rather than fixed. The local control system continuously adjusts the discharge command based on real-time monitoring of consumer equipment power consumption. This dynamic adjustment allows the system to maximize power reinjection when consumer demand is high while automatically reducing discharge when demand is low, maintaining operational continuity.

Inventive Principle:

Principle #15Dynamics

4Loss of energy

If the consumer terminal is not a contractual producer of power, then it cannot legally reinject power into the network, but the power storage device still has stored power that needs utilization

Engineering Contradiction:

Improveutilization of stored powerVSAvoidflexibility in power utilization options

Core Design Contradiction:

Loss of energyVSAdaptability or versatility

Solution Approach 1:

The power storage device is designed to serve multiple functions: it can supply power to consumer equipment, charge from the distribution network, and conditionally discharge to the network when the terminal has contractual producer status. The local control system adapts the device's function based on the terminal's contractual status and real-time power conditions, maximizing versatility within legal constraints.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11011910B2System and method for controlling a power storage device

Publication Date: 2021.05.18 ELECTRICITE DE FRANCE

AI summary

The present invention relates to a local control system (6) configured to define a charge or discharge command made to a power storage device (5) on the basis of a charge or discharge instruction, sent by an overall control system (7), and the instantaneous power used by the power-using devices (4), such that the instantaneous power used by the power using devices (4) is always greater than the discharge power of the power storage device (5), so as to guarantee that the power stored by the power storage device (5) is not re-injected into the power distribution network (3).