Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

The UK grid operator has further tightened certification requirements for inverters, raising the market entry threshold by mandating that grid-connection certificates must be of the COC (Certificate of Conformity) type.The company’s self-developed string inverter, featuring a high-safety design and grid-friendly performance, has successfully passed all required tests. The product fully complies with the technical requirements for four distinct grid-connection categories—Type A, Type B, Type C, a

How to Resolve the Islanding Lockout of Grid-Connected InvertersResolving the islanding lockout of a grid-connected inverter usually refers to situations where, despite the inverter appearing to have a normal connection to the grid, the system still fails to establish an effective connection with the grid. Below are general steps to address this issue: Check inverter settings: Verify the inverter’s configuration parameters to ensure they comply with local grid requirements and regulations, inclu

Common inverter faults mainly include overcurrent, short circuit, ground fault, overvoltage, undervoltage, phase loss, overheating, overload, CPU malfunction, and communication errors. Modern inverters are equipped with comprehensive self-diagnostic, protection, and alarm functions. When any of these faults occurs, the inverter will immediately trigger an alarm or shut down automatically for protection, displaying a fault code or fault type. In most cases, the fault cause can be quickly identifi

Overvoltage Fault Analysis in Inverter Voltage DetectionThe inverter is the core of modern electric drive systems, enabling precise motor speed control. To ensure safe and stable operation, it continuously monitors key parameters—voltage, current, temperature, and frequency. This article analyzes overvoltage faults in inverter voltage detection circuits.Inverter overvoltage refers to the DC bus voltage exceeding a safe threshold, risking component damage and triggering protective shutdown. Under

The primary distinctions between low-frequency inverters and high-frequency inverters lie in their operating frequencies, design structures, and performance characteristics in different application scenarios. Below are detailed explanations from several perspectives:Operating Frequency Low-Frequency Inverter: Operates at a lower frequency, typically around 50Hz or 60Hz. Because its frequency is close to that of utility power, it is suitable for applications requiring stable sine wave output. Hig

What Maintenance Does a Solar Micro-Inverter Need?A solar micro-inverter is used to convert the DC power generated by photovoltaic (PV) panels into AC power, with each panel typically equipped with its own micro-inverter. Compared to traditional string inverters, micro-inverters offer higher efficiency and better fault isolation. To ensure their long-term stable operation, regular maintenance is crucial. Below are the main maintenance tasks for solar micro-inverters:1. Cleaning and Inspection Cl

Safety Systems to Prevent Grid-Tied Inverters from Supplying Power During Grid OutagesTo prevent grid-tied inverters from continuing to supply power to the grid during outages, several safety systems and mechanisms are typically employed. These measures not only protect the stability and safety of the grid but also ensure the safety of maintenance personnel and other users. Below are some common safety systems and mechanisms:1. Anti-Islanding ProtectionAnti-islanding protection is a critical tec

Inverters are power electronic devices that convert direct current (DC) to alternating current (AC). In certain applications, they can play a crucial role in stabilizing voltage fluctuations within the power grid. The following sections detail how inverters contribute to voltage stability:1. Voltage RegulationInverters can maintain stable output voltage through internal control algorithms and power regulation mechanisms. Specifically: Constant Voltage Output: Inverters automatically adjust their

Basic Principles and Types of InvertersAn inverter is a power electronic device that converts direct current (DC) into alternating current (AC). It is widely used in renewable energy systems, uninterruptible power supplies (UPS), electric vehicles, and other applications. Depending on the specific application and technical requirements, inverters can operate based on different principles and come in various types. Below are some common types of inverters and their working principles:1. Single-Ph

How to Measure Leakage Current of a UPS Inverter Using a Multimeter or Clamp MeterMeasuring the leakage current of a UPS inverter is an important safety check that ensures the proper functioning of the equipment and the safety of users. The leakage current should be below 0.2A. Below are the steps to measure the leakage current using a multimeter or clamp meter.Using a Multimeter to Measure Leakage CurrentMaterials Needed Multimeter: Ensure the multimeter has AC current measurement capability. I