Mar 6, 20213 min read

Huawei Zero export device | Huawei export limiting | 2021

Updated: Oct 14, 2021

Huawei Grid Tie PV Inverters

Huawei Technologies Co., Ltd. is a Chinese based technology company founded in 1987 they're headquartered in Shenzhen, Guangdong.

It designs, develops, and sells telecommunications equipment and consumer electronics. It also provides grid-tie solar inverters from the range from 3kW to 100kW.

Huawei manufactures a range of products designed for solar photovoltaic solutions. These include the SUN2000 string inverter series, the iManager smart management system incorporating the Smart Logger, iManager NetEco 1000S and FusionSolar.

The SUN2000 is a transformer-less grid-tied photovoltaic inverter that converts high voltage DC power into sine wave 3-phase grid-frequency AC.

The absence of a transformer leads to higher efficiency, reductions in weight and size and a lower cost due to the reduced number of components.

The component parts of the SUN2000 series inverter system are located in a single aluminium cabinet with an integral heat sink.

The cabinet is IP65 rated for outdoor use which means the electronic components are protected against dust and water ingress which reduces the likelihood of damage to components. This is in line with industry standards.

Since 2015, Huawei is the top manufacturer of solar inverters in the world. Followed by Sungrom and SMA.

Source: Wood Mackenzie

Huawei Zero Export Device

On-gird solar power (PV) plant generates excess power when the connected load is lesser than the power generated by the solar power plant (Power generation > Power required).

This excess power is synchronized with grid power hence it can revere the power flow.

In simple words, power will flow from the PV plant owner’s home to the connected grid [when Solar power generation > Power required by connected load].

With ZED Advance Huawei gird tie inverters can be programmed to restrict the excess power generation. Hence provide Zero Export solution to solar plant owners.

ZED Advance is a programmable controller with set points, which can detect reverse power flow (from home to the grid) and control the power generation of the solar power plant.

When ZED Advance detects reveres power [solar power generation > Load demand] it ramps down the power generation of the grid-connected PV plant.

To match, load demand = solar power generation

And when the load increases, the ZED Advance will ramp up the solar power production accordingly.

As long as solar power generation is lower than the load demand, ZED Advance won't affect any change in solar power generation. But it keeps monitoring the system.

Setpoints of ZED Advance can be set between 0% to 100%. Where 5% means that the minimum 5% of load will be served by the grid.

If the frequency of load variation is very high, we need to fix the setpoint above 0% the suitable setpoints are 5%, 10% and 15%.

Curious about ZED Advance? We make a whole page on “ZED Advance” go and checkout and it will help you will be able to select the correct solution for your need.

Huawei Export Limiter

Export Limitation means limiting the amount of power exported to the grid. Export limiters limit the power generation from the Huawei PV inverter so that amount of power to be exported to the grid can be limited.

ZED Advance can also work as an export limiter for Huawei make a grid-connected solar inverter.

Circuit Diagram of connecting ZED Advance with Huawei make gird tie inverter.

ZED Advance required a Current transformer along with 10 core, 1.5 Sqmm Cable at the incomer from the grid for the load the measurement and 3 core 1.5 Sqmm cable for self-power as shown in the above illustration.

And compares this with the adjustable setpoint of the controller.

ZED advance also required LAN cable (cat 6) to communicate with Huawei Solar Inverter as well as web portal (for online monitoring).

When the consumption from GRID is above this set point, the solar energy will be increased, when the consumption is below this set point, the solar energy will be reduced.