The invention relates to new energy power generation and a testing system in the filed of new energy power generation testing, in particular to a high-low-voltage ride-through testing system based on a series dynamic voltage recovery device. According to the high-low-voltage ride-through testing system, the structure that a high-voltage generating device and a low-voltage generating device are connected in series is applied, the high-low-voltage ride-through testing system is connected between a wind turbine generator unit and a power grid or between a photovoltaic power generation system and the power grid, the voltage sag process and the voltage swell process are simulated, and independent high-voltage ride-through testing, independent low-voltage ride-through testing and high-low-voltage ride-through mixed testing can be conducted on the wind turbine generator unit and the photovoltaic system through a switch time sequence; the switch time sequence is simple in logic and easy to achieve.

High and low voltage ride-through test system based on series dynamic voltage recovery device

The invention relates to a dynamic voltage restorer compensation control method The dynamic voltage restorer compensation control method is mainly characterized by comprising the steps of determiningthe sensitive load voltage sag tolerance characteristic and obtaining a tolerance characteristic curve voltage upper limit value and sensitivity on phase jump; after voltage sag occurrence is determined, determining system voltage amplitude, phase, sag type and sag occurrence phase; judging whether compensation is needed or not; judging whether phase compensation is needed or not; judging whethervoltage compensation is needed or not; determining the output voltage of DVR, and meanwhile, determining the maximum compensation time of the dynamic voltage restorer at the output voltage; judging whether the DVR compensation working time T is greater than or equal to a compensation time threshold value or not; and properly lowering the compensation voltage value for a fixed value By virtue ofthe dynamic voltage restorer compensation control method, the shortcomings of overhigh energy consumption and incapability of compensation caused by the DVR compensation extreme limit problem in the existing compensation control method can be overcome, the economic efficiency of the dynamic voltage restorer is improved, and the compensation time is prolonged effectively

Dynamic voltage restorer compensation control method

A photovoltaic generator set low-voltage ride-through supporting system based on a DVR is characterized by comprising the dynamic voltage restorer (DVR), an active power release circuit, a network side reactive current injection inverter and a controller The system has the advantages of being strong in low-voltage ride-through capacity, low in cost required by improvement and high in reliability, enabling a photovoltaic system to have low-voltage ride-through capacity, being capable of providing certain reactive power for a power grid, reducing loss caused by faults and improving reliability of grid power supply

Photovoltaic generator set low-voltage ride-through supporting system based on DVR

The invention discloses a comprehensive test system for low voltage ride through or low voltage support, and belongs to the test field of low voltage ride through or support in a high-power power electronic technology. The system is characterized in that a power grid low voltage generating device and a power grid low voltage support device are in series connection in front of a grid connection point of a new energy power generation system or another sensitive load (a load which is greatly affected by voltage fluctuation or temporary decrease) which needs to be subjected to the low voltage ride through test; the two devices are achieved according to a principle of a DVR (Dynamic Voltage Restorer), and adopt three-phase independent configuration; the three phases are not interfered mutually; and the three phases of the low voltage generating device and three phases of the low voltage support device are in corresponding series connection. The comprehensive test system disclosed by the invention is low in cost and wide in application range, and can perform effective test for the low voltage ride through and support.

Comprehensive test system for low voltage ride through or low voltage support

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Comprehensive test system for low voltage ride through or low voltage support