Interconnected Inverter Synchronization Without Extra A/D Ports
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Solution Overview
Problem
Converting a vehicle-mounted inverter to a grid-connected inverter requires an additional A/D port for voltage sensor value reception, leading to increased costs due to the need for extra hardware and software modifications.
Innovation Solution
An interconnected inverter configuration that includes a resolver digital converter to convert voltage sensor data into electrical angle information, allowing the control unit to synchronize AC power output with the AC power line using specific angle timing, eliminating the need for a new A/D port and reducing diversion costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a vehicle-mounted inverter is diverted to a grid-connected inverter by adding an A/D port for voltage sensor value reception, then the inverter can synchronize with the AC power line, but the cost and device complexity increase due to extra hardware and software modifications
Solution Approach 1:
The patent applies universality by enabling the inverter to function in multiple modes: it can operate as a vehicle-mounted inverter driving a motor or as a grid-connected inverter synchronizing with the AC power line. The existing control unit and angle detection mechanisms are reused for both purposes, eliminating the need for separate A/D ports and reducing device complexity while maintaining adaptability to different application scenarios
Solution Approach 2:
The inverter uses its own existing angle detection information (originally designed for motor control) to achieve grid synchronization. Instead of requiring external voltage sensor inputs and A/D conversion, the system serves itself by repurposing its internal angle detection capabilities for dual functionality, thereby reducing hardware requirements and simplifying the overall system architecture
2Adaptability or versatility
If an A/D port is added to receive voltage sensor values for synchronization, then the inverter can achieve synchronization with AC power line, but the manufacturing cost increases due to extra hardware requirements
Solution Approach 1:
The control unit is designed to serve multiple purposes: it controls motor operation in vehicle-mounted applications and achieves grid synchronization in grid-connected applications. By reusing the same control logic and angle detection information for both functions, the patent eliminates the need for additional A/D ports and voltage sensor interfaces, thereby reducing manufacturing cost while maintaining synchronization capability
Solution Approach 2:
The patent extracts the essential function of grid synchronization from the traditional approach that requires separate A/D ports and voltage sensor inputs. Instead, it utilizes the already-present angle detection information from the inverter's control system, removing the need for additional hardware components and reducing manufacturing complexity and cost
Data Source
AI summary
A system of an interconnected inverter includes an inverter that converts DC power from a DC power supply into AC power and provides AC power to an AC power line, an RDC that converts a voltage value obtained by a voltage sensor into electrical angle information that shows a phase angle of an output voltage, the voltage sensor obtaining a voltage value of an output voltage from the inverter to a power grid, and an ECU that controls the inverter to provide an alternating current in synchronization with an alternating current that flows through the AC power line by using timing at which an angle shown in the electrical angle information given from the RDC attains to a prescribed angle. Extra cost for diversion can be reduced.