What is the fixed operation mode of photovoltaic modules?

Most PV modules are installed in fixed installations. The fixed operation mode of photovoltaic array is to install photovoltaic modules on fixed structural parts. The photovoltaic array faces the equator at a certain installation angle, and converts light energy into electrical energy after receiving the radiation of the sun. Its advantages are that the civil […]

Position relationship between the sun and the earth

The earth rotates around its “earth axis” at the north and south poles every day. One rotation is one day and one night, and 15° per hour. The earth is revolving around the sun while it is rotating, and one revolution is one year. The inclination of the normal line between the earth’s rotation axis […]

What types of inverters are there?

Photovoltaic power generation systems are connected to the grid or loads through inverters with various technical structures. Due to the diversity of application occasions, it will inevitably lead to the diversity of photovoltaic module installations. In order to maximize the conversion efficiency of solar energy and take into account the economic benefits, the diversification of […]

What are the methods of inverter maximum power point tracking?

The maximum power point tracking of solar cells is an indispensable part of photovoltaic power generation systems. The purpose of maximum power tracking is to make solar cells work at the maximum power point all the time. By tracking and searching the maximum power point of the solar cell, the grid-connected current is maximized and […]

What is a micro inverter?

In recent years, new architectures of “micro inverter” and “micro converter” have emerged, that is, each solar cell module is equipped with a micro inverter, and the output power of each module is optimized to maximize the overall output power. Even if some panels are affected by shadows, dust coverage, etc., the inverter power optimizer […]

What is a distributed inverter?

Strictly speaking, the distributed inverter is not a specific inverter type, but a centralized inverter and a combiner box with MPPT function to form a distributed inverter solution. This solution refers to the solution of decentralized MPPT optimization and centralized grid-connected power generation. By adding the DC/DC boost conversion hardware unit and the MPPT control […]

What is a string inverter?

String inverters are mainly used in small and medium-sized photovoltaic power generation systems. They refer to single-phase or three-phase output inverters that can be directly connected to the string and used for outdoor hanging installations based on the modular concept. It is a kind of inverter that has a maximum power peak tracking at the […]

What is a centralized inverter?

Centralized inverters are mainly used in large-capacity photovoltaic power generation systems such as ground power stations and large workshops. The total system power is large, generally above the megawatt level. Inverter power is usually greater than 100kW. There are many photovoltaic modules connected to a single inverter. The power devices use high-current IGBTs. The system […]

Multi-level non-isolated photovoltaic grid-connected inverter topology

In a non-isolated photovoltaic grid-connected system with traditional topology, the output voltage of solar cell modules must be greater than the peak voltage of the grid at any time, so photovoltaic modules need to be connected in series to increase the input voltage level of the photovoltaic system. However, the series connection of multiple photovoltaic […]

Single-stage non-isolated photovoltaic grid-connected inverter

In order to improve the efficiency of photovoltaic grid-connected systems and reduce costs as much as possible, under the condition that no mandatory electrical isolation is required (the relevant standards of some countries require mandatory electrical isolation for photovoltaic grid-connected systems), a non-isolated transformerless type can be used Topology scheme. The non-isolated photovoltaic grid-connected inverter […]