Voltage Control Inverter Synchronization via Single-Side Detection
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Solution Overview
Problem
Voltage control inverters face challenges in synchronizing with electric power systems, leading to high currents due to mismatched voltage amplitude, frequency, and phase, which existing technologies fail to address effectively without requiring multiple sensors.
Innovation Solution
A voltage control inverter system that includes a voltage detecting circuit and a voltage output circuit, controlled by a controller to synchronize the output voltage with the electric power system's voltage, frequency, and phase, using a main contactor switch and sensors to prevent high current flow during synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a synchronous entry function is implemented to match voltage amplitude and frequency, then high current flow is prevented, but multiple sensors are required to detect voltages on both sides of the main contactor
Solution Approach 1:
The patent extracts and utilizes only the necessary voltage detection function from the sensors. By detecting voltage only on the power system side and using the main contactor's switching state to determine connection timing, the system eliminates the need for sensors on the inverter side, reducing sensor quantity while maintaining synchronous entry capability
Solution Approach 2:
The main contactor serves as an intermediary element that enables voltage matching without requiring direct sensing on both sides. The controller uses the main contactor's on/off state as a mediator to infer voltage conditions and timing, replacing the need for multiple sensors with a single sensor combined with switching state information
2Reliability
If voltage matching control is performed before connection, then safe synchronization is achieved, but the control system becomes more complex
Solution Approach 1:
The controller performs preliminary voltage detection and analysis before the main contactor closes. By detecting the power system voltage in advance and calculating the appropriate connection timing, the system achieves voltage synchronization without requiring complex real-time control during the switching instant
Solution Approach 2:
The system uses its own main contactor switching state as part of the control information, rather than requiring external sensors to provide all necessary data. The controller self-determines connection timing by combining single-side voltage detection with its knowledge of the main contactor's state, simplifying the control architecture
Data Source
AI summary
According to one embodiment, a voltage control inverter interconnectable with an electric power system, includes: a voltage detecting circuit configured to detect a first voltage that is a voltage of the electric power system; and a voltage output circuit configured to output a second voltage to the electric power system at a timing depending on a value of the first voltage, the second voltage having a value depending on the value of the first voltage.