Inverter Current Sensor Phase and Direction Detection
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Solution Overview
Problem
The installation of current sensors in energy storage inverters is often incorrect, leading to operational inefficiencies due to improper phase connections and direction reversals, which are difficult to detect without professional intervention.
Innovation Solution
A method and device for detecting the installation state of current sensors by injecting reactive power into each phase of the inverter, comparing initial and output reactive powers to determine matching sensors, and adjusting phases and directions based on threshold differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current sensors are installed manually by professional installers according to phase sequence and direction, then installation accuracy is improved, but installation time and complexity increase
Solution Approach 1:
The system performs preliminary detection by injecting reactive power into each phase and comparing the detected reactive power with expected values to identify correct current sensor installations before full operation begins. This preliminary action allows automatic verification and correction of sensor installation status.
Solution Approach 2:
The inverter automatically detects and identifies the installation status of current sensors without requiring professional installers to manually verify each connection. The system uses its own reactive power output and detection capabilities to self-verify sensor installation correctness, reducing dependency on external expertise.
2Productivity
If current sensors are installed without professional intervention to reduce installation time, then installation efficiency is improved, but installation accuracy deteriorates
Solution Approach 1:
The system injects reactive power into each phase and detects the resulting reactive power output. By comparing detected values with expected values, the system provides feedback on whether current sensors are correctly installed, allowing automatic identification and correction of installation errors without professional intervention.
Solution Approach 2:
The system changes operational parameters by injecting specific reactive power into different phases and monitoring the resulting changes in detected reactive power. These parameter changes enable the system to identify which current sensors are correctly installed based on the relationship between injected and detected power values.
3Measurement precision
If reactive power injection detection method is implemented, then detection accuracy is improved, but system complexity increases
Solution Approach 1:
The inverter uses its existing reactive power output capability for dual purposes: normal energy storage operation and current sensor installation detection. The same detection circuitry and control system are used for both operational control and installation verification, avoiding the need for separate dedicated detection equipment.
Solution Approach 2:
Reactive power serves as an intermediary signal for detection. By injecting reactive power into different phases and measuring the resulting reactive power output, the system indirectly determines current sensor installation status without requiring direct physical inspection or additional sensing hardware.
Data Source
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AI summary
The present invention discloses a method and device for detecting an installation state of a current sensor. The method including: obtaining an initial reactive power of each phase of an inverter and an initial current sensor number for a current sensor installed to the phase; injecting a preset reactive power into each phase of the inverter one by one, and acquiring a first reactive power output from each phase of the inverter; determining one by one a matching current sensor for each reference phase based on a comparison result between a first difference and a first preset threshold and generating a matching current sensor number for each phase; adjusting an installation phase of each current sensor according to the matching current sensor number, injecting the preset reactive power to each phase of the inverter one by one, and acquiring a second reactive power output from each phase; and determining an installation direction of the matching current sensor for each phase based on a comparison result between the second difference and the first preset threshold. The present invention provides an effective method for detecting the installation phase position and installation direction of each current sensor on the inverter, thereby improving the installation efficiency of the inverter product.