Under the grid connected operation mode, the voltage and frequency of microgrid are all supported by power grid, and each micro source adopts P/Q control mode. The specific control strategy: The working state of the central controller loop to detect the micro source and the load, in the power grid power generation without restrictions, to the maximum output of photovoltaic and wind turbine regulating mode, the energy storage system with electricity hot standby state.
When the micro grid load is less than the micro source of total power generation, photovoltaic and wind turbine power supply spare power to the power grid, when the total generating capacity of micro grid load is larger than the micro source, supplied power from the grid. In the main power grid is limited, determine whether the send power back to the grid, when there is excess electricity to power grid, control the micro source of P and Q, the micro grid to power grid scheduling should not exceed the limit. It can also control the energy storage at peak discharge according to different power price at peak time and valley time, and discharge during valley time, so as to maximize the economic benefit of microgrid operation by using renewable energy.
In the grid operation, there will be some unexpected situations. For example, a blower or PV automatically exit running due to overheating fault, micro controller source to inform the central controller. After the failure has been relieved, then meet the grid conditions, the micro controller sends the grid request information to the central controller, the central controller sends the zero output grid instructions, recalculate the current power generation and power consumption of microgrid, gradually increase the output of the new micro grid source.
In the grid, the load management is simple, when receiving a load out or incorporated into the micro grid, as long as the records, and then recalculate the new power and electricity, according to the need to make appropriate adjustments to the power. The feeder level and substation level micro grid, may also receive the main peak of some scheduling order, this time to the microgrid to assess the situation, to meet the conditions, control of energy storage equipment, charge and discharge in accordance with the time node scheduling.
If the main power overhaul, generally know in advance what time the power cut off, the central controller will control the microgrid in power before the initiative entering the grid operation. If the main fault is detected, the grid voltage or frequency of serious overrun, and outlets of the protection or the controller of quick action, micro grid into passive off grid.
SOROTEC Solar MPPT Charge Controller 60A 3200W 12V 24V 48V
1. Intelligent maximum power point tracking technology increases efficiency 25%~30%
2. Compatible for PV systems in 12v, 24v or 48v
3. Three-stage charging optimizes battery performance
4. Maximum charging current up to 60a
5. Maximum efficiency up to 98%
6. Battery temperature sensor (BTS) automatically provides temperature compensation
7. Support wide range of lead-acid batteries including wet, AGM, and gel batteries
8. Multi-function LCD displays detailed information
