Green Line

This, the country largest test park, is organised and controlled by the China electric power Research Institute (CEPRI), a subsidiary of the State grid Corporation of China (SGCC). Set up in in 1951, the institute is seated in the north of Beijing. Its main task consists of R & D activities on anything having to do with China’s energy supply. The test park in Zhangbei is laid out for extensive prototype testing of wind turbines as well as for the typical tests for compliance with the grid fault tolerance standards (grid codes). All the necessary requirements are set up at the grid connection point. The set up includes a system for producing voltage dips (low voltage ride through, LVRT), with output of 2.5 MW grid Simulator with a capacity of 6 MW, and energy storage system.

Research the grid compatibility together with one of the top ten wind turbine manufacturers, the extensive tests now underway at the Zhangbei test park are intended to clarify whether the systems are capable of feeding reactive current into the grid in compliance with the grid codes. So tested are the frequency control requirements for supporting the grid stability and the grid-stabilising properties of the wind turbines in the context of certain power supply issues. As a supplier and technology partner of many years, PCS is contributing its Green line 1000 reactive power converter, which satisfies the grid operators’ requirement to provide a reactive current during temporary voltage dips of non a wind turbine. More than 130 MW worth of wind power capacity has already been fitted with the green line 1000 reactive power converter. LVRT Requirements Fully Satisfied PCS Green Line 1000 is installed on the 690 V side parallel to the wind generator of the respective wind turbine. It consists of a pulsed IGBT power converter with voltage link. As long as line-side reference conditions are met, the converter operates in the standby mode.