Frequency Stabilizer Layout for Fast Response and Voltage Matching
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Solution Overview
Problem
In interconnected system facilities, the input/output voltage of storage battery systems limits the stable operation of power converters, preventing high-speed response and high output due to voltage range constraints, and increasing the number of auxiliary equipment when components are distributed across different buildings.
Innovation Solution
A frequency stabilizer configuration that includes a bidirectional AC/DC converter connected between an AC power system and a first energy storage system, and a bidirectional DC/DC converter between the first and second energy storage systems, all housed within a building, allowing for high-speed response and reduced auxiliary equipment by adjusting voltage and sharing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bidirectional DC/DC converter with a reactor is connected between the first power converter and the storage battery system, then voltage matching and stable operation are improved, but the current response speed is limited and high-speed response cannot be attained
Solution Approach 1:
The patent divides the energy storage system into two separate systems: a first energy storage system (storage battery system) for stable voltage matching through the DC/DC converter, and a second energy storage system (capacitor system) for high-speed current response. This segmentation allows each subsystem to specialize in different functions, resolving the contradiction between stability and response speed.
Solution Approach 2:
The patent introduces a second energy storage system (capacitor) as an intermediary between the first power converter and the first energy storage system. This intermediary capacitor system provides high-speed current response capability while the DC/DC converter maintains stable voltage matching with the battery system, thus resolving the contradiction.
2Speed
If another energy storage system different from the storage battery system is connected between the first power converter and the second power converter, then high-speed response and higher output are attained, but the total number of pieces of auxiliary equipment increases when components are disposed in different buildings
Solution Approach 1:
The patent merges both energy storage systems (storage battery system and capacitor system) along with the bidirectional DC/DC converter into a single integrated frequency stabilizer unit housed in one building. This consolidation reduces the total number of auxiliary equipment pieces and simplifies the overall system architecture while maintaining high-speed response capability through the capacitor system.
3Adaptability or versatility
If the input/output voltage of the storage battery system falls outside the stable control voltage range of the first power converter, then charging or discharging cannot be performed, but connecting additional power converters increases system complexity
Solution Approach 1:
The patent uses the bidirectional DC/DC converter to dynamically adjust and transform the voltage parameters between the first and second energy storage systems. This allows the system to adapt to different voltage ranges and SOC levels without requiring multiple discrete power converters, thus expanding voltage range adaptability while controlling system complexity.
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 frequency stabilizer achieves high-speed response and higher output while minimizing auxiliary equipment by stabilizing voltage and sharing components within a building, reducing overvoltage and resonance issues.
Implementation Method 1
The bidirectional AC/DC converter is connected between an AC power system and the first energy storage system
Implementation Method 2
The bidirectional DC/DC converter is connected between the first energy storage system and the second energy storage system
Data Source
AI summary
A frequency stabilizer includes a bidirectional AC/DC converter, a bidirectional DC/DC converter, a first energy storage system, a second energy storage system, and a building. The bidirectional AC/DC converter is connected between an AC power system and the first energy storage system. The bidirectional DC/DC converter is connected between the first energy storage system and the second energy storage system. Two or more of the first energy storage system, the second energy storage system, the bidirectional AC/DC converter, and the bidirectional DC/DC converter are disposed inside the building.