What are the applications of MOSFET and IGBT in household photovoltaic energy storage?

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What are the applications of MOSFET and IGBT in household photovoltaic energy storage?

Posted Date: 2024-01-12

1. Introduction to household photovoltaic energy storage

Residential energy storage, also known as home energy storage, is an energy system that combines distributed photovoltaics with home energy storage. The system uses solar power generation equipment to provide electricity for homes and stores excess electricity to supply to the grid or for home use.

The system mainly includes the following components:

Photovoltaic modules: convert solar energy into electrical energy;

Energy storage battery: stores electrical energy and releases it for home use when needed;

Inverter: Converts DC power to AC power for home use;

Control unit: manages the operation of the entire system, including battery charge and discharge control, inverter operation control, etc.

This system can realize the organic combination of photovoltaic power generation and household electricity, improving the reliability and economy of household electricity. At the same time, the addition of energy storage batteries can solve the intermittent problem of photovoltaic power generation and improve the stability of the system.

In addition, the system can also support users to set their own charging and discharging times to meet users' power needs. At the same time, the system is highly integrated, which can significantly reduce system installation time and costs, achieve intelligent control, and meet users' power needs.

When the power grid is out of power, household photovoltaic energy storage systems can provide safe power protection and ensure the normal power consumption of households. At the same time, it can also interact with the power grid to achieve optimal allocation and utilization of energy.

2. Analysis of household photovoltaic energy storage market

Driven by the dual strategies of 'rural revitalization' and 'dual carbon', household photovoltaics are heading towards the fast lane of development.

According to data from the National Energy Administration, my country's new grid-connected photovoltaic power generation capacity will be 87.41GW in 2022, of which 36.29GW will be added to centralized photovoltaic power stations and 51.11GW to distributed photovoltaic power stations. Household photovoltaics, which has been developing rapidly recently, has added 25.25GW, a year-on-year increase of 17.3%. The domestic cumulative installed capacity is 67GW, which is approximately equivalent to 3.5 million households. It can generate 70 billion kilowatt-hours of green power every year, becoming a power source that cannot be ignored in the development of renewable energy.

In the first three quarters of 2023, the country's newly installed photovoltaic capacity was 128.94GW, a year-on-year increase of 145%, including 61.8GW of centralized photovoltaics and 67.14GW of distributed photovoltaics. The newly installed household distributed photovoltaic capacity nationwide was 32.97GW, accounting for approximately 50% of the newly installed distributed photovoltaic capacity, more than a quarter of the total newly installed photovoltaic capacity in the country, and the scale of newly installed household photovoltaic capacity last year (25.25 1.3 times of GW).

3. Household photovoltaic energy storage topology and Longteng product advantages

Household photovoltaic energy storage inverter topology

Household photovoltaic energy storage battery BMS topology

For household photovoltaic energy storage inverter applications, Longteng Semiconductor's SJMOS has product advantages:

For the interleaved PFC topology, the switching speed is optimized and can be used with SIC SBD. At the same time, the EAS is optimized to enhance avalanche resistance and surge resistance;

For INV topology, optimize the body diode, enhance di/dt capability, and reduce Qrr and drive interference;

Optimize Qg and Coss/Ciss ratio to reduce drive loss and improve drive anti-interference capability.

For household photovoltaic energy storage inverter applications, Longteng Semiconductor's IGBT has product advantages:

Optimize Vceset to maximize conduction loss and reduce temperature rise;

Optimize anti-parallel diodes to enhance di/dt capabilities;

Optimize switching speed, switching frequency can reach 60kHZ.

For household photovoltaic energy storage BMS applications, Longteng Semiconductor's SGTMOS has product advantages:

Optimize Qg and Vth to achieve better turn-on and turn-off consistency when connected in parallel;

Optimize EAS and short-circuit resistance to make the battery protection circuit safer and more reliable.

The above advantages make the application of Longteng products simple for household photovoltaic energy storage.

4. Longteng’s selection table for household photovoltaic energy storage MOSFETs

Function Topology Product Series Product number PV-Vbus boost 600-700V SJMOS LSB65R041GF battery-Vbus (bidirectional) LSB65R070GF DC-AC full-bridge inverter
H5 LSB65R099GF LSB65R125GF 650VIGBT LKB40N65TM1 ​​LKB75N65TM1
(To be released soon) Charge and discharge protection Back-to-back 60-100V
(coming soon)

Review Editor: Liu Qing

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