Power Converter Module Inner Current Loop Control
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Solution Overview
Problem
Conventional power conversion systems with outer loop control structures experience increased response time when dealing with multiple DC power sources, leading to inefficiencies in voltage adjustment and stability.
Innovation Solution
A power converter module with an inner current loop control system, where a bi-directional DC to DC converter is connected to a current controller, and a shared voltage controller generates current commands to adjust the output voltage across multiple power converter modules, enabling simultaneous charging or discharging of DC power sources and improving system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an outer loop control structure is used with multiple DC power sources, then the system can manage multiple power sources, but the response time increases
Solution Approach 1:
The control system is segmented into separate voltage controller and current controller modules, each handling specific control functions independently. The voltage controller manages voltage regulation while the current controller handles current distribution, allowing parallel processing and reduced response time when managing multiple DC power sources
Solution Approach 2:
The patent transitions from a single-loop control structure to a dual-loop control structure by adding the inner current loop. This dimensional expansion in control architecture enables simultaneous voltage regulation and current management, significantly improving response speed while maintaining the ability to handle multiple power sources
2Ease of operation
If an outer loop control structure is used, then the system can control voltage and current, but the voltage adjustment accuracy decreases
Solution Approach 1:
The control functions are segmented into voltage control and current control modules. The current controller specifically handles precise current regulation based on voltage commands, enabling high-precision voltage adjustment through dedicated current management
Solution Approach 2:
The patent implements feedback mechanisms in both voltage and current control loops. The current controller receives feedback from the actual current measurement and adjusts its output accordingly, while the voltage controller uses feedback to generate accurate current commands, ensuring precise voltage adjustment
Data Source
AI summary
A power conversion system comprises a plurality of power converter modules, each including a bi-directional DC to DC converter and a current controller, wherein the bi-directional DC to DC converter is connected to the current controller, for charging or discharging a DC power source according to a distribution command received from the current controller, and a voltage controller, connecting to the plurality of power converter modules, for generating a current command to the current controller, wherein the voltage controller generates a current command to the current controller of the power converter module according to the detected capacity and voltage of the DC power source, whereby the current controller generates the distribution command to the bi-directional DC to DC converter with the received current command.