A transient stability control method for a renewable energy power generation base

Abstract

The invention discloses a transient stability control method for a renewable energy power generation base. First, the predetermined value I of the total control current injected by the renewable energy power generation base into the grid connection point is determined. * ; put I * Compare with and calculate the total control current command value injected by the renewable energy power generation base to the grid connection point; The current controller of the grid-side converter of the wind power system and the photovoltaic power generation system determines the command value of the d and q-axis current components of the grid-side converter: take the sum as the total current of the rotor-side and grid-side converters of the doubly-fed induction wind power system command, and determine the command value of the d and q axis current components of the rotor side and grid side converters respectively. It can improve the large disturbance stability of the renewable energy power generation base and avoid transient instability.

Description

technical field [0001] The invention relates to an improved transient stability control method for renewable energy power generation bases, applicable objects include doubly-fed induction wind power grid-connected systems, inverter-type wind power grid-connected systems (such as permanent magnet direct drive wind power systems) and photovoltaic power generation grid-connected systems. Grid system, this method can significantly improve the large-disturbance stability of renewable energy power generation bases under grid short-circuit faults, and solve the problem of large-disturbance instability of renewable energy power generation bases under grid faults. Background technique [0002] With the rapid development of renewable energy such as wind power and photovoltaics, the access ratio and transmission distance of renewable energy power are gradually increasing, which leads to the weakening of the dominant characteristics of synchronous generators in the system, and the curren...

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Problems solved by technology

[0005] Literature [1] analyzes the active and reactive capabilities of different renewable energy power generation equipment, and plans the controllable operation area of ​​DFIG and PMSG, which can increase the transient voltage level and reduce the power shortage degree, but does not consider the possible Large Disturbance Stability of Renewable Energy Generating Equipment

Literature [2] studied the small-signal instability phenomenon of double-fed grid-connected system during low-voltage ride-through period of weak grid, and studied the influence of phase-locked loop and current loop control parameters on the small-signal stability of grid-connected system, but the literature It does not involve the existence of the equilibrium operating point of the renewable energy grid-connected system under the grid short-circuit fault

In fact, when a severe short-circuit fault occurs in the power grid, the interaction between the output power flow of the renewable energy power generation base and the line impedance may lead to the absence of a balanced operating point in the system, resulting in a large disturbance and instability of the renewable energy power generation base

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