Automated Crowbar Circuit Testing via Controller Self-Service
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Solution Overview
Problem
Existing renewable energy power systems face challenges in efficiently testing and ensuring the proper operation of complex power converters, particularly the crowbar circuit, which is time-consuming and costly, especially after troubleshooting or structural modifications.
Innovation Solution
An automated method and apparatus that tests the crowbar circuit of a power converter by implementing specific test sequences to determine the operability of anti-parallel diodes and voltage-controlled switching elements, using current-voltage feedback to verify their functionality, and includes a controller to perform these tests within the power conversion assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual testing methods are used to test the crowbar circuit components, then testing can be performed with simple equipment, but testing time and costs increase significantly
Solution Approach 1:
The power converter itself is used as the testing apparatus by implementing test sequences through its existing controller. The controller executes automated test routines that activate crowbar circuit components and measure their responses using the converter's own control and measurement capabilities, eliminating the need for external complex testing equipment while achieving automated high-speed testing
Solution Approach 2:
The controller is designed to perform multiple functions: normal power conversion control and automated crowbar circuit testing. By integrating testing capabilities into the existing controller, the system achieves multi-functionality that resolves the contradiction between testing productivity and device complexity
2Reliability
If comprehensive testing of all crowbar circuit components is performed, then reliability of the power converter is improved, but testing time and complexity increase
Solution Approach 1:
The testing process is divided into separate test sequences, each targeting specific crowbar circuit components (voltage-controlled switching element, anti-parallel diode, resistor). This segmentation allows comprehensive testing of all components while organizing the testing process efficiently to minimize total testing time
Solution Approach 2:
The controller automatically executes test sequences without requiring manual setup or configuration. Test parameters and procedures are pre-programmed into the controller, allowing comprehensive testing to begin immediately when initiated, significantly reducing the time loss associated with manual testing preparation
3Reliability
If re-testing is performed after troubleshooting or modifications, then proper operation is ensured, but time and costs are wasted due to manual testing processes
Solution Approach 1:
The power converter performs its own self-diagnosis and verification through automated test sequences executed by its controller. After troubleshooting or modifications, the system can autonomously re-test its crowbar circuit components to verify proper operation, eliminating the need for external testers and significantly improving testing efficiency while ensuring operational correctness
Data Source
AI summary
The present disclosure is directed to an automated apparatus and method for testing a crowbar circuit of power converter. The crowbar circuit includes an anti-parallel diode and a voltage-controlled switching element, e.g. a silicon-controlled rectifier (SCR). The method includes implementing a first test sequence for testing operability of the diode and a second test sequence for testing operability of the voltage-controlled switching element. More specifically, the first test sequence determines a first current-voltage feedback that is indicative of the operability of the diode and the second test sequence determines a second current-voltage feedback that is indicative of the operability of the voltage-controlled switching element.