Transient stability control method for renewable energy power generation base

Abstract

The invention discloses a transient stability control method for a renewable energy power generation base. The method comprises a step of determining a renewable energy power generation base and injecting a total control current predetermined value I* to a grid connection point, a step of comparing the I* with I*max and calculating a total control current command value injected into the grid connection point by the renewable energy power generation base, a step of calculating d-axis and q-axis current component command values I*d and I*q injected into the grid connection point by the renewableenergy power generation base, a step of sending the I*d and I*q into current controllers of grid side converters of an inverter type wind power system and a photovoltaic power generation system and determining d-axis and q-axis current component command values I*d and I*q of the grid side converters, and a step of taking I*d and I*q as rotor side and grid side converter total current commands ofa doubly-fed induction wind power system and determining d-axis and q-axis current component command values of rotor side and grid side converters. According to the method, the stability of the renewable energy power generation base to large interference can be improved, and the transient instability is avoided.

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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