Grid-Connected Inverter Control Circuitry for Voltage Sampling
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Solution Overview
Problem
Conventional medium and high voltage grid-connected power generation systems face complexities in wire connections and potential safety hazards due to the need for multiple connecting lines and reduced isolation performance.
Innovation Solution
A medium and high voltage grid-connected system with a control circuitry that manages the connection and disconnection of the medium and high voltage power grid using a switch, allowing for real-time communication and synchronization with inverter units to optimize voltage and phase alignment, thereby simplifying wiring and enhancing isolation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If six connecting lines are used to collect voltages on both sides of the high voltage contactor or tap switch, then voltage sampling is achieved, but the system wiring becomes complex
Solution Approach 1:
The patent extracts the voltage sampling function from the inverter system and places it in an independent sampling device. This separation removes the need for six connecting lines within the inverter system, as the sampling device independently collects voltage signals from both sides of the high voltage contactor or tap switch through its own wiring arrangement, thereby simplifying the inverter system's wiring complexity while maintaining voltage sampling capability
Solution Approach 2:
The sampling device acts as an intermediary between the high voltage contactor/tap switch and the inverter system. It collects voltage signals from both sides of the contactor or switch and provides this information to the inverter system without requiring the inverter system to directly connect six lines to the contactor or switch, thus reducing wiring complexity while achieving accurate voltage sampling
2Measurement precision
If medium and high voltage power grid sampling is introduced in the inverter system, then grid voltage monitoring is achieved, but the isolation performance of the system is reduced and security risks are caused
Solution Approach 1:
The patent extracts the grid voltage sampling function from the inverter system and implements it in a separate sampling device. This physical separation maintains the isolation performance and security of the inverter system while still enabling grid voltage monitoring capability, as the sampling device can independently measure grid voltage without compromising the inverter system's electrical isolation
Solution Approach 2:
The sampling device serves as an intermediary that monitors grid voltage without being part of the main power flow path through the inverter system. It provides voltage information to the inverter system through isolated communication channels, thereby achieving grid voltage monitoring while maintaining the isolation performance and security of the inverter system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves the isolation performance of the system, reduces safety hazards, and simplifies the connection process, effectively addressing the complexity of wire connections in conventional systems while ensuring efficient operation and redundancy in power grid management.
Implementation Method 1
A transformer is provided, which converts a low voltage outputted by the at least one inverter unit to a medium voltage
Data Source
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AI summary
The present application provides a medium and high voltage grid-connected power generation system, a medium and high voltage grid-connected system and a control circuitry (103) thereof. The voltage of the medium and high voltage power grid is collected through the control circuitry. A power grid amplitude and a power grid phase synchronization signal are obtained, and then sent to an inverter unit (101) through a communication line. In this way, the isolation performance of the system is improved, potential safety hazards are avoided, and the problem of complicated wire connection in the conventional art is avoided.