Grid-Connected Power Storage System With Parallel Switches
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Solution Overview
Problem
Photovoltaic generation systems face challenges in expanding capacity without increasing space and power consumption, as their internal circuit elements are fixed and additional systems are required when capacity needs to be increased.
Innovation Solution
A grid-connected power storage system with a main battery and additional batteries, a bidirectional converter with parallel switches, and an integrated controller that selectively controls the switches based on power usage, allowing for dynamic expansion of capacity without additional installations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the capacity of a photovoltaic generation system is increased by installing additional systems, then the power generation capacity is improved, but the space required and power consumption increase
Solution Approach 1:
The patent merges multiple battery functions into a single integrated power storage system. The main battery and additional battery are combined within one system架构, sharing common control and conversion infrastructure. This allows capacity expansion without proportionally increasing space requirements, as the additional battery utilizes the existing system framework rather than requiring a completely separate installation.
Solution Approach 2:
The bidirectional converter is designed to serve multiple functions: it handles power conversion for both the main battery and additional battery, manages charging and discharging operations, and interfaces with both the photovoltaic generation system and the grid. This multi-functionality reduces the need for separate dedicated components for each battery, thereby reducing overall space consumption while maintaining expanded capacity.
2Power
If the capacity of a photovoltaic generation system is increased by installing additional systems, then the power generation capacity is improved, but the power consumption increases
Solution Approach 1:
The control system merges the management of main and additional batteries into a unified architecture. The integrated controller coordinates both batteries and the bidirectional converter, eliminating redundant control functions and reducing overall power consumption. The system intelligently manages power flow between batteries and external sources, optimizing energy utilization and minimizing wasted power.
Solution Approach 2:
The power storage system implements self-service through intelligent power management. The system automatically balances charges between the main battery and additional battery, manages discharge/charge cycles, and interfaces with the grid or photovoltaic system as needed. This self-regulating capability reduces the need for external power input for system management, thereby reducing overall power consumption while maintaining expanded capacity.
3Power
If additional batteries are added to expand capacity, then the power generation capacity is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple battery management functions into a unified control architecture. The integrated controller manages both the main battery and additional battery through a single control interface, and the bidirectional converter handles power conversion for both batteries simultaneously. This merging approach expands capacity while avoiding proportional increases in system complexity, as the additional battery integrates into the existing control framework rather than requiring separate dedicated control systems.
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 system efficiently expands capacity and reduces space and power consumption by dynamically managing power distribution between main and additional batteries, enabling increased power supply without the need for additional infrastructure.
Implementation Method 1
a bidirectional converter coupled to the main and additional batteries, and including a plurality of switches for performing a conversion between a DC link voltage, between the power generation system and the grid, and a battery voltage
Implementation Method 2
a main battery for discharging stored power to the load system; at least one additional battery coupled to the main battery for discharging stored power to the load system
Data Source
AI summary
A grid-connected power storage system for coupling a power generation system to a grid, including: a main battery for discharging stored power to the load system; at least one additional battery coupled to the main battery for discharging stored power to the load system; a bidirectional converter coupled to the main and additional batteries, and including a plurality of switches for performing a conversion between a DC link voltage, between the power generation system and the grid, and a battery voltage, a first switch of the plurality of switches corresponding to the main battery and a second switch of the plurality of switches corresponding to the additional battery, wherein the first and second switches are connected to each other in parallel; and an integrated controller for selectively controlling operations of the first switch and the second switch based on an amount of power used by the load system.