Voltage-frequency comprehensive control method for direct-drive wind generator set

Abstract

The invention discloses a voltage-frequency comprehensive control method for a direct-drive wind generator set and relates to the technical field of new energy power generation. The method comprises the following steps of: 1, detecting a pitch angle and a rotating speed and an electromagnetic torque of a generator when the wind generator set operates, and sampling the detected values; 2, converting the degree of membership of an operating state of the generator set; 3, calculating a virtual excitation regulation command value and a virtual torque regulation command value of each generator setin a wind power station; 4, calculating a dynamically adjusted coordination degree parameter K of the rotating speed of the wind generator set; 5, calculating a pitch control command value and a power regulation command value of a permanent magnet direct-drive wind generator set, superposing the values with the parameter K and transmitting to a comparator; and 6, controlling a pitch control mechanism and a converter control mechanism, detecting the pitch angle of the wind generator set in real time, outputting active and reactive power, and transmitting a feedback signal to the comparator forfeedback control. By the method, actual working conditions can be accorded, and a variable-speed constant-frequency direct-drive motor wind power station can be better subjected to comprehensive optimal control.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, in particular to a voltage-frequency comprehensive control method of a direct-drive wind turbine considering changes in wind speed. Background technique [0002] The comprehensive control of direct-drive wind turbines is a very critical link in the entire wind power generation control system, which directly affects the operating efficiency of wind turbines and the ability of the grid to accept wind power. [0003] The comprehensive control of existing wind turbines usually adopts the control method of direct voltage and direct torque, for example, the invention patent CN101272117A the voltage and reactive power fast control method of the variable speed constant frequency wind turbine wind farm, and the invention patent CN101860042A The coordinated control of the active power of the wind farm method, its implementation is mainly to compare the real-time state quantity of the wi...

AI Technical Summary

Problems solved by technology

When the output reactive power of some wind turbines in the wind farm reaches the limit, the lack of coordination among the wind turbines may easily cause insufficient or excess reactive power compensation for the entire field, which does not meet the actual working conditions. Similarly, due to When wind turbines are running at variable speeds, the active power adjustment capabilities at different operating points vary greatly. Since this control method does not consider the wind energy prediction and segmental control of the unit’s operating area, it is difficult to reasonably allocate active power adjustment tasks, which may easily lead to excessively low or low speed wind turbines. Protection cut-off when too high

Images