IEEE Electrification Magazine - June 2017 - 31
Figure 1. PVs installed in the Project 1 microgrid.
Figure 3. PVs installed in the Project 2 microgrid.
Figure 2. Batteries installed in the Project 1 microgrid.
Figure 4. Wind units installed in the Project 2 microgrid.
Method for Renewable energy and energy
Storage Capacity Configuration
5) The capacity of the energy storage can guarantee
the power supply for important loads in the isolated microgrid for a period under extreme conditions.
Taking a large-scale isolated microgrid in southern
China as an example, the total load of this isolated system
is 9 MW, which was supplied by four 2.2-MW diesel generators in the past. Now PVs and energy storage will be used
to replace the diesel generators. The load level of this
microgrid, including the total load and the important load,
will determine the capacity configuration of PVs and
energy storage.
On the basis of the preceding principles, energy storage
capacity should be enough to ensure the reliable power
supply for the important load under extreme conditions,
and the renewable energy resource should be used as
much as possible to replace the diesel generators. During
In a large-scale isolated microgrid, to determine the capacities of renewable energy generation and energy storage, the following principles are usually adopted.
1) In general, the total capacity of distributed renewable
energy generation should follow the principle of local
generation-local consumption.
2) Energy storage will be used to smooth the power fluctuation caused by renewable energy generation and improve
the utilization efficiency of renewable energy resources.
3) To enhance the stability of the microgrid, energy storage can also be used to absorb the system fluctuations
caused by a sudden large load change.
4) Energy storage can transfer the energy of renewable
energy generation.
Table 2. a comparison of energy storage characteristics.
Type
Lead-Acid
Battery
Lithium Iron
Phosphate Battery
Flow
Battery
Lead Carbon
Battery
Price
Low
High
Highest
Fair
Reliability
Better
Good
Fair
Better
Environmental protection
Poor
Good
Poor
Fair
Safety
Good
Fair
Better
Better
Transport and maintenance
Convenient
Fair
Inconvenient
Convenient
Charge and discharge capacity
Bad
Good
Poor
Fair
Cycles
Bad
Good
Best
Better
Response time
Fair
Fastest
Slow
Fast
IEEE Electrific ation Magazine / j une 2 0 1 7
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