Household Energy Storage Black Start Using Timed Sleep Wake Control
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Solution Overview
Problem
Household energy storage systems in off-grid states face challenges in achieving a black start without a connected power grid, particularly during extreme conditions like long-time power outages.
Innovation Solution
A method and system that include a Battery Management System (BMS), Energy Management System (EMS), and Power Conversion System (PCS) to detect low state of charge, initiate a sleep mode, and utilize an auxiliary power supply to ensure successful black starting by timing and charging the battery system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the battery system is discharged to low SOC to extend operating duration, then the energy storage capacity is improved, but the system cannot achieve black start when power grid is disconnected
Solution Approach 1:
The system performs preliminary charging of the battery system before the black start event occurs. The BMS monitors SOC and initiates charging operations in advance to ensure sufficient energy is available when black start is needed, rather than waiting until discharge occurs.
Solution Approach 2:
The BMS continuously monitors battery SOC and provides feedback to the control system. When SOC reaches a threshold or when grid disconnection is detected, the system automatically initiates appropriate actions (charging or black start procedures) based on real-time battery status.
2Loss of energy
If the system enters sleep mode to conserve energy, then energy efficiency is improved, but the system cannot respond to black start requirements
Solution Approach 1:
The system dynamically adjusts its operational state based on real-time conditions. The BMS monitors SOC and grid status to determine whether to maintain sleep mode or activate the system for black start, allowing flexible transition between low-power and active states.
Solution Approach 2:
Continuous monitoring of battery SOC and grid connection status provides feedback that triggers state transitions. When SOC is sufficient and black start is needed, the system exits sleep mode; otherwise, it remains in energy-saving state.
3Reliability
If the BMS continuously monitors battery state to ensure safety, then system reliability is improved, but communication delays occur during critical transitions
Solution Approach 1:
The BMS performs self-verification of critical parameters and makes autonomous decisions for black start initiation without requiring external controller intervention. This reduces communication overhead and accelerates response time during critical transitions.
Solution Approach 2:
The BMS pre-prepares black start parameters and maintains communication channels in advance. When black start is triggered, the system can immediately execute pre-configured sequences, reducing actual response time despite continuous monitoring requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables successful black starting of the household energy storage system even in off-grid states by effectively managing battery discharge and charging, ensuring continuous power supply during outages.
Implementation Method 1
the other part of which is stored in a battery system of the household energy storage system, so that the household energy storage system continues to power the loads at night through the battery system
Data Source
AI summary
Provided are a household energy storage system in an off-grid state and a black start method therefor. The method includes: in response to detecting that a battery system is discharged to a SOC of less than or equal to a set value M, sending, by a BMS, a state of the battery system to an EMS; sending, by the EMS, timing starting time T1 and black start time T2 to the BMS; starting, by the BMS, timing from T1 and after a time T, instructing the battery system to stop working such that the household energy storage system enters a sleep mode; in response to performing timing to T2, waking, by the BMS, an auxiliary power supply up for power supply to the EMS; and in response to detecting that the battery system is in a charging state, determining, by the EMS, that a black start succeeds.