System Components and Architecture
1. Power Conversion Unit: This includes a DC modulation circuit, a power switch array, and harmonic suppression components, responsible for primary DC-to-AC conversion.
2. Intelligent Control Unit: This integrates a signal acquisition module, a logic processing chip, and a human-machine interface, enabling real-time control of operating parameters and status monitoring.
3. Electrical Isolation Unit: This primarily consists of an industrial frequency transformer and performs both voltage matching and electrical isolation.
Energy Conversion Mechanism
1. DC Pre-processing: This utilizes a boost circuit to boost the output voltage of the photovoltaic array, creating favorable conditions for subsequent inverter operation.
2. Pulse Width Modulation: This utilizes high-frequency switching devices to switch between conduction states according to a sinusoidal law, generating a quasi-AC waveform with adjustable pulse width.
3. Waveform Shaping: This utilizes a filtering system consisting of a multi-stage LC network to effectively eliminate switching harmonics and output pure sinusoidal AC power.
System Protection Mechanisms
1. Overvoltage Protection: This utilizes a voltage sampling circuit to monitor abnormal input and output voltages in real time.
2. Overcurrent Protection: A fast-acting fuse is installed to protect against short-circuit and other fault conditions.
3. Temperature Monitoring: Temperature sensors are installed at key power components to prevent damage from overheating.
