Abstract
A control algorithm for Parallel Connected Offshore Wind Turbines with permanent magnet synchronous Generators (PCOWTG) is presented in this paper. The algorithm estimates the optimal collective speed of turbines based on the estimated mechanical power of wind turbines without direct measurement of wind speed. In the proposed topology of the wind farm, direct-drive Wind Turbine Generators (WTG) is connected to variable low-frequency AC Collection Grids (ACCG) without the use of individual power converters. The ACCG is connected to a variable low-frequency offshore AC transmission grid using a step-up transformer. In order to achieve optimum wind power extraction, the collective speed of the WTGs is controlled by a single onshore Back to Back converter (B2B). The voltage control system of the B2B converter adjusts voltage by keeping a constant Volt/Hz ratio, ensuring constant magnetic flux of electromagnetic devices regardless of changing system frequency. With the use of PI pitch compensators, wind power extraction for each wind turbine is limited within rated WTG power limits. Lack of load damping in offshore wind parks can result in oscillatory instability of PCOWTG. In this paper, damping torque is increased using P pitch controllers at each WTG that work in parallel with PI pitch compensators.
Highlights
IntroductionThe first offshore wind farm installed on the coast of Sweden, with a rated power of
The first offshore wind farm installed on the coast of Sweden, with a rated power of220 kW, dates back to 1990
Instead of using the Wind Generator (WG) active power, which was the case of the PCOWTG control system presented in [18], the calculated mechanical power of the Wind Turbine Generators (WTG) is used for estimating the wind speed of each Wind Turbine (WT)
Summary
The first offshore wind farm installed on the coast of Sweden, with a rated power of. In offshore wind parks with HVAC transmission lines, Wind Turbine Generators (WTG) are connected to an AC collector grid using an AC/AC power converter. The offshore transmission line is DC, where the collector grid frequency is decoupled from the mainland AC frequency In this case, offshore and onshore substations contain AC/DC and DC/AC power converters in addition to transformers. Another similar configuration of offshore wind parks under the name “slim wind turbine concept” is proposed and analysed in [6] at the level of feasible study, without designing the system’s controller This paper extends this concept by developing a detailed simulation model using the Matlab/Simulink and Simscape Specialized Power System toolbox, designing the closedloop control system and solving the problem of undamped oscillations of rotor angles.
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