DC Bus Voltage Control via Distributed Energy Storage Units
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Solution Overview
Problem
Existing DC distribution grids face challenges in stabilizing DC bus voltage due to limitations in communication speed and coordination between energy storage units and system controllers, leading to bus voltage instability, especially in dynamic power regulation scenarios.
Innovation Solution
A method and system where energy storage units in the DC bus system detect voltage levels, determine power reference values, and adjust output or absorbing power in real-time to stabilize the DC bus voltage, using a power controller with a detector, calculator, and controller to autonomously manage power based on predefined preset values and functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the system uses a centralized controller to regulate DC bus voltage through communication with energy storage units, then the system structure is simple and easy to implement, but the communication speed limitation causes delayed voltage regulation and instability
Solution Approach 1:
Each energy storage unit is equipped with a power controller that autonomously detects DC bus voltage and adjusts its own output power based on preset functions, enabling self-service voltage regulation without waiting for centralized controller instructions, thus resolving the speed limitation caused by communication delays
Solution Approach 2:
The centralized voltage regulation function is segmented and distributed to multiple energy storage units, with each unit independently participating in voltage regulation through its local power controller, transforming a single-point control bottleneck into a distributed parallel control system
2Speed
If the system increases communication frequency between controller and energy storage units to improve voltage regulation timeliness, then voltage regulation speed improves, but communication resource consumption increases and system reliability decreases
Solution Approach 1:
Energy storage units autonomously monitor DC bus voltage and independently adjust their power output based on real-time voltage conditions and preset control functions, eliminating dependence on frequent communication with the centralized controller, thus improving both response speed and system reliability simultaneously
3Productivity
If the system uses centralized coordination for power regulation of energy storage units, then power distribution is optimized, but communication abnormalities cause voltage instability
Solution Approach 1:
Each power controller continuously detects DC bus voltage and uses preset functions to determine required power adjustments, creating a closed-loop feedback mechanism at each energy storage unit that maintains voltage stability even when centralized coordination is unavailable due to communication abnormalities
Solution Approach 2:
The centralized power coordination function is segmented into distributed autonomous control capabilities at each energy storage unit, allowing the system to maintain effective power regulation through local intelligence even when centralized coordination fails due to communication issues
Data Source
AI summary
A method for controlling a DC bus voltage in a DC bus system, the system including a DC bus and an energy storage unit coupled to the DC bus, includes: detecting a DC bus voltage; detecting, by the energy storage unit, a DC bus voltage of the DC bus; determining, by the energy storage unit, a power reference value based on the DC bus voltage; and adjusting, by the energy storage unit, one of output power and absorbing power based on the power reference value.