Problem Description
According to onsite reports, the electricity quantity purchased by FusionSolar is inconsistent with the actual electricity meter record. In January 2012, Fusionsolar acquired 328.62 kWh, but the actual meter recorded 693 kWh.
Networking mode: SDonle+SUN2000-10KTL-M1--- zero egress restriction
Problem Analysis
According to the meter data, the first reverse active PowerPoint in January was recorded as 680.54 and the last reverse active PowerPoint on January 31 was recorded as 1009.16. The subtraction data is consistent with the energy management data.
According to the active power data of the meter, the three-phase power is very unbalanced.
Confirm that one-way instruments are used on site. In addition, the Power Limiting parameter Limiting Mode is set to Total Power.
Assume that the three-phase load power is 2 kW, 1 kW, and 3 kW respectively, and the total power is limited. In this case, the inverter power is limited to 6 kW, and the average single-phase output power is 2 kW. In this case, L2 has 1 kW. L3 slave grid curve: 1 kW.
In this case, if a unidirectional meter is used, the online power is also calculated as the power consumption. As a result, the actual power consumption of the electric meter of the grid company is large.
Solution
If a unidirectional meter is used onsite and the load is unbalanced, change the limit mode to single-phase power.
Observe that the power consumption of the two devices is basically the same.
If part of the energy yield is allowed to feed to the grid, it is recommended that the power grid company change the meter to a bidirectional meter and limit the total power. In this case, the energy yield will not be lost.
Single-phase limit: Based on the minimum one-phase power limit, some energy yield is lost.
