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capacity of wind farm in [1]. Advantages and disadvantages of HVDC and AC
transmission system access to wind farm are compared in [2]. The static and
dynamic performance influence of wind farm connecting into power grid are
analyzed in [3-6]. STATCOM is introduced to improve the dynamic performance
of wind farm. Two different integration methods HVAC and VSC-HVDC based
on PSS/E software are compared, on this basis STATCOM has been applied to
dynamic performance of wind farm.
2 MethodofWindFarmIntegration
2.1 HVAC Integration Mode
Offshore wind turbine generated AC power and then transmitted to collector
bus, after the step-up transformer, AC cable integrated the offshore wind farm
into the main onshore grid, shown in Figure 1. AC cable has large charging
capacitance, generated reactive power caused the voltage of wind farm exports
rose, so reactive power compensation device need to be installed in front of
access grid. When the offshore wind farm in normal operation, reactive power
compensation device adsorb reactive power, while in fault, the reactive power
compensation need to provide reactive power to improve capability of low volt-
age ride through. Static Var Compensator (SVC) can be used in small capac-
ity while static synchronous compensator (STATCOM) can be used in lager
capacity.
Fig. 1. Offshore wind farm integration method of HVAC
The biggest advantage of offshore wind farm AC transmission is simple sys-
tem structure and low cost. However, if the offshore wind farm capacity and
transmission distance increased, the line loss will seriously increase. As a con-
sequence, transmission voltage level and devices (such as transformers, reactive
power compensation devices, etc.) capacity need to increase, as well as subma-
rine cable cross sectional area, all these will increase dramatically in costs. In
addition, the grid connected must keep pace with the output of offshore wind
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