Transient power angle stability control method for regional interconnected power grid with controllable inertial wind power

Abstract

The invention discloses a transient-state power angle stabile control method for regional interconnected power grids with controllable inertial wind power. The transient-state power angle stabile control method comprises the steps of determining whether the power angles of two regional interconnected power grids with controllable inertial wind power are subjected to vibration or not; if not, continuing to monitor, and if so, determining a position relation between an equivalent active power output value of a power-transmission-side generator set GS and a power setting interval value; if the equivalent active power output value is greater than the power setting interval value, outputting a formula that H<Svir> is equal to H<Svir>_max, and H<Rvir> is equal to 0; if the equivalent active power output value is less than the power setting interval value, outputting a formula that H<Svir> is equal to 0, and enlarging the H<Rvir> to an inertia setting range; and if the equivalent active power output value is within the range of the power setting interval value, not performing regulation. Compared with a conventional transient-state power angle stabile control method, the transient-state power angle stabile control method provided by the invention adopts the corresponding inertia regulation method according to the active output state of the generator and the power angle yaw direction of the interconnected power grids, so that the power angle vibration problem caused by wind power field grid connection and system fault is effectively solved, and the transient-state stabilization level of the power grids is improved; and in addition, the magnitude of the inertia of sub region systems of the interconnected power grids are changed by the wind power fields, so that the transient-state stability of the system is improved.

Description

technical field [0001] The invention relates to a transient stability control method of an interconnected power grid, in particular to a transient power angle stability control method of a regional interconnected power grid including controllable inertial wind power, and belongs to the technical field of power generation system control. Background technique [0002] With the gradual maturity of wind power technology, the scale of wind power grid connection is increasing, and the impact of wind farm access on the power system is becoming more and more significant. characteristics. Taking the variable-speed wind turbine as an example, through independent active power adjustment, the unit can simulate a controllable inertial response to provide inertial support for the system, effectively avoiding the adverse effects of system inertia weakening. However, the large amount of controllable virtual inertia of variable-speed wind turbines will significantly change the inertia of th...

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Problems solved by technology

However, the large amount of controllable virtual inertia of variable-speed wind turbines will significantly change the inertia of the generator groups at both ends of the tie line, which may cause severe swings in the power angle between the generator groups, change the transient stability level of the power grid, and make the safe and stable operation of the power system change. more severe

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