Battery Pack Black Start Circuit Without Extra Inverter Hardware
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Solution Overview
Problem
Inverters require additional black start modules, leading to high costs when they lack power from photovoltaic units or AC power grids, necessitating a cost-effective solution for initiating operation.
Innovation Solution
A battery pack with an integrated black start circuit, including a first auxiliary power supply, capacitor, switch module, and isolation switch, allows energy transfer to the inverter during power outages, eliminating the need for extra components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a black start module component such as a black start power supply is added to enable the inverter to start when no power is supplied by the photovoltaic unit or alternating current power grid, then the inverter can implement black start, but the cost of the battery pack increases
Solution Approach 1:
The battery pack's existing power supply system is designed to serve multiple functions: normal power supply during operation and black start power supply when the inverter needs to start without external power. The battery pack can automatically switch between these modes, eliminating the need for a dedicated black start power supply component and reducing overall system cost while maintaining black start capability.
Solution Approach 2:
The battery pack uses its own stored energy to provide black start power to the inverter, rather than requiring an external or separate power supply system. The control module detects when the inverter needs black start and automatically activates the battery pack to supply power, making the system self-sufficient for startup operations.
2Device complexity
If the battery pack uses its own power to supply the inverter during black start, then additional black start power supply components are eliminated, but the battery may be at risk of overdischarge
Solution Approach 1:
The control module continuously monitors the battery pack's voltage and state of charge during black start operation. When the battery voltage drops below a predetermined threshold or the state of charge reaches a critical level, the control module automatically terminates the black start power supply to prevent overdischarge. This feedback mechanism protects the battery while enabling cost-effective black start functionality.
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
The solution enables reliable and cost-effective black start without additional power supplies, enhancing system stability and reducing the risk of overdischarge.
Implementation Method 1
a first capacitor, connected between a first input end of the first auxiliary power supply and a second input end of the first auxiliary power supply
Implementation Method 2
The battery pack includes a battery, a conversion circuit, and a black start circuit
Data Source
AI summary
A battery pack and an energy storage system. The battery pack is configured to supply power to an inverter. The battery pack includes a battery, a conversion circuit, and a black start circuit. The conversion circuit is configured to connect to the inverter through a power bus. The black start circuit includes a first auxiliary power supply, a first capacitor, a switch module, an isolation switch, and a control module.