DC Bus Voltage Control for High Voltage Ride-Through
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Solution Overview
Problem
Existing power supply systems face inefficiencies in voltage control during high voltage ride-through events due to the reliance on high-speed communication cables between separate front and post voltage conversion apparatuses, which hinders timely voltage adjustments and power output.
Innovation Solution
A control system and method that enables direct current bus voltage control without relying on high-speed communication cables by using a post controller to transmit high voltage ride-through information directly through the direct current bus to a front controller, allowing for rapid voltage adjustments and efficient power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-speed communication cables are used to transmit voltage reference values between front and post voltage conversion apparatuses, then voltage control accuracy can be maintained, but control response time is delayed and system cost increases
Solution Approach 1:
The patent uses the direct current bus as an intermediary medium to transmit control signals. Instead of using separate communication cables, the control signal is superimposed on the power transmission bus itself, allowing simultaneous power delivery and control communication without additional transmission delays
Solution Approach 2:
The patent merges the power transmission function and control signal transmission function into a single direct current bus. By combining these functions, the system eliminates the need for separate communication cables and their associated delays, achieving faster control response
2Measurement precision
If high-speed communication cables are used for voltage control signaling, then control precision can be maintained, but device complexity and system cost increase
Solution Approach 1:
The direct current bus is designed to serve multiple functions: it simultaneously transmits electrical power from the front voltage conversion apparatus to the post voltage conversion apparatus, and carries control signals for voltage reference updates. This multi-functionality eliminates the need for dedicated communication infrastructure
Solution Approach 2:
The patent extracts the control signal transmission function from the separate communication cable system and integrates it into the power transmission bus. This removal of redundant components simplifies the overall system architecture while maintaining control precision
3Adaptability or versatility
If front and post voltage conversion apparatuses are disposed separately in two boxes, then system modularity is improved, but control efficiency during rapid voltage changes deteriorates
Solution Approach 1:
The direct current bus acts as an intermediary that bridges the physically separated front and post voltage conversion apparatuses. It enables rapid transmission of voltage reference updates between the separated units, maintaining control efficiency despite physical separation and preserving system modularity
Data Source
AI summary
A control system and method for a power supply system. The control system includes a front controller and a front voltage conversion circuit and a post controller and a post voltage conversion circuit. The front voltage conversion apparatus is configured to supply power to the post voltage conversion apparatus through a direct current bus. The post voltage conversion apparatus is configured to: receive electric energy transmitted by the front voltage conversion apparatus through the direct current bus, and supply power to a power grid. The post controller is further configured to transmit, to the front controller through the direct current bus, information indicating that high voltage ride-through occurs on the power grid. Voltage control on the direct current bus does not need to depend on the high-speed communication cable, thereby improving control efficiency of a power supply system.