| Summary: | 碩士 === 國立臺北科技大學 === 電機工程系所 === 97 === The 98% of resources are imported into Taiwan, because natural resources are in shortage. In addition, Off-shore islands and coast of western Taiwan have abundant wind power energy and for increasing renewable resource penetration of Taiwan, the TPC plan to build large wind farms in Chang-Pin and Peng-Hu in 2010 and 2015, respectively. There will be a serious impacts on the PCC of wind farms and buses nearby when large capacity wind farms interconnect to TPC power systems, also the issue of wind farm’s response behavior is concerned when faults occur in different locations and different types of TPC power system. So, the study investigates the simulation of power flow of the large wind farm which is connecting to the system, the fault current which is supplied from wind farm, transient response behaviors of wind farm when faults occur and the wind farm disconnect caused by fault occur from different voltage level.
The simulation program of this study uses power system simulation program PSS/E, the investigated systems are entire TPC power system in 2010 and 2015. The 108MW wind farm is connected to Sheng-Ci substation which is under Chang-Pin extra high voltage zone in 2010, and the 200MW wind farm is connected to Peng-Hu primary substation in 2015, both of the two wind farms are connected to 161kV side of substations. Peng-Hu will be connected to Taiwan by submarine cable in 2015, therefore Peng-Hu will be the terminal of TPC power system. The characteristic of submarine cable is over high reservoir capacitor that will cause high voltage in terminal of submarine cable. Banks of reactor should be installed on both sides of terminal of submarine cable to decrease the voltage increase. For this situation, the impact to Peng-Hu will be more serious when wind farm is connected. The improvement method to these cases are also described in this article.
The wind turbine simulated in this article is GE 1500 produced by GE Wind, and DFIG is installed in this machine. Known by different sets of reactive power of DFIG, the impact of Chang-Pin system is slight when 108MW wind farm connected Based on different control modes of reactive power of GE 1500 in 2010, but it’s opposite for Peng-Hu with 200MW wind farm in 2015. For the Peng-Hu cases, banks of reactor installed on both sides of submarine cable should be adjusted to make different reactive power control modes connected to Peng-Hu successfully, and maintain in range of TPC rules. The difference between the two cases are because the robustness of each system. Besides, the fault current provided by each wind farm won’t let breaker of PCC lose function. Two wind farms mentioned above that operate in control mode of absorbing reactive power such as voltage control 0.95pu and power factor control 0.9 leading, output active power of wind turbine is disturbed more obviously than the other four control modes during the three phase short circuit fault. The 108MW wind farm in 2010’s system with peak load under the three phase short circuit fault of 345kV bus range has a better low voltage ride through performance than light load,but there are no differences between system’s peak and light for the three phase short circuit faut of 161kV bus. However, no matter the fault occurred of 345kV or 161kV bus in 2015, the 200MW wind farm can endure more one point of fault in peak load system than in light load.
From the final results, if it needs to consider the power quality of wind farms when system faults, then it’s not suit for 108MW wind farm connected to Chang-Pin system in 2010 when using absorbed reactive power control mode. However, because the submarine cable connected between Taiwan and Peng-Hu in 2015, the compensator on the both side of submarine cable should be timely adjusted for different reactive power control mode of wind farm.
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