Three-Phase Three-Level Power Control for Half-Bus Fault Shutdown
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Solution Overview
Problem
Existing three-phase power supply systems in air-conditioning systems face issues with controlling half-bus loads when full-bus loads fail, leading to over-voltage phenomena that damage storage capacitors, resulting in lower control efficiency and higher fault rates.
Innovation Solution
A control method and system that utilizes a first control device to detect target-type faults and send control signals via a communication channel to a second control device to quickly stop the half-bus load, using a dedicated or existing communication channel to ensure timely operation cessation, thereby protecting capacitors and improving control efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the full-bus load suddenly fails without timely control of the half-bus load, then the system continues operating, but the capacitor becomes prone to over-voltage phenomenon causing damage
Solution Approach 1:
The patent implements a feedback mechanism where the first control device continuously monitors the operating status of the full-bus load and sends control signals to the second control device when faults are detected. This feedback loop enables timely response to load failures, preventing capacitor over-voltage while maintaining system reliability.
Solution Approach 2:
The patent establishes preliminary control arrangements by pre-configuring the communication channel and control signal transmission mechanism between the first and second control devices. When a fault occurs, the control signal is already in place to quickly stop the half-bus load, preventing over-voltage damage before it can occur.
2Productivity
If a communication channel is established between control devices to enable timely control, then control efficiency improves, but device complexity increases
Solution Approach 1:
The communication channel between the first and second control devices serves multiple functions: it transmits control signals for load management, provides fault status information, and enables coordinated operation. This multi-functionality improves control efficiency while minimizing the addition of separate dedicated communication infrastructure.
Solution Approach 2:
The patent merges the control functions of multiple devices through a unified communication protocol and signal transmission mechanism. By combining the monitoring and control capabilities in a coordinated manner, the system achieves efficient control without proportionally increasing overall system complexity.
3Reliability
If the half-bus load is not controlled to stop working when full-bus load fails, then operational continuity is maintained, but the fault rate of the power supply control circuit increases
Solution Approach 1:
The feedback mechanism enables the first control device to immediately detect full-bus load failures and transmit control signals to the second control device, reducing fault response time. This real-time feedback prevents capacitor damage and improves control circuit reliability by quickly isolating faulty conditions.
Solution Approach 2:
The patent implements rapid control signal transmission that rushes through the detection and response process. When a fault is detected, the control signal is immediately sent through the communication channel to stop the half-bus load, skipping unnecessary delays and intermediate processing steps that would increase fault response time.
Data Source
AI summary
A control method includes, in response to detecting a target-type fault, determining, by a first control device managing a three-phase three-level power supply circuit, a control signal for instructing a first load to stop operating. The first load is connected to one of buses of the three-phase three-level power supply circuit, and the target-type fault is correlated with a second load connected to two of the buses of the three-phase three-level power supply circuit. The method further includes sending the control signal to a second control device via a target communication channel, to instruct the second control device to control the first load to stop operating.