Novel parallel active subsynchronous oscillator suppressor damping control optimization strategy
A technology of damping control and synchronous oscillation, applied in the direction of reducing/preventing power oscillation, AC network circuits, circuit devices, etc., can solve the problems of unoptimized damping control strategy and unconsidered shunt characteristics, etc., to achieve strong damping suppression ability and enhancement The effect of inhibition
Inactive Publication Date: 2018-06-05
张喜军
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Problems solved by technology
The damping control strategies of active subsynchronous oscillation suppression devices proposed in the existing literature all use modal signals to modulate the output voltage, and through reasonable design of the phase shift angle, the device outputs subsynchronous and supersynchronous damping currents at the same time, resulting in subsynchronous damping. moment, to achieve the purpose of suppressing subsynchronous oscillation, but it does not consider the different shunt characteristics of subsynchronous and supersynchronous frequency components in the actual system, so the damping control strategy cannot be optimized
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[0012] As shown in the figure, the novel parallel active subsynchronous oscillation suppressor damping control optimization strategy of the present invention includes a damping control strategy, a damping control optimization strategy, and a DC voltage regulator. The core of the damping control strategy is how to generate an effective damping current signal through the damping control link. The present invention proposes a single-frequency modulation method, that is, both the separate sub-synchronous current and the super-synchronous current generate positive damping to achieve sub-synchronous oscillation. inhibition. In the present invention, the expressions of subsynchronous current and supersynchronous current components are: , Among them, K and φ are proportional coefficient and phase shift angle respectively, and Δδ is the adjustable phase. "sub" and "sup" denote subsynchronous impedance and supersynchronous impedance, respectively.
[0013] The damping control optim...
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The invention discloses a novel parallel active subsynchronous oscillator suppressor damping control optimization strategy, which is characterized in that the control strategy is a damping control strategy that only generates a subsynchronous current or a supersynchronous current, performs design analysis on key parameters for different systems shunt characteristics, and proposes a damping controlstrategy optimization design method which comprises the steps of: injecting a subsynchronous / supersynchronous current with a constant amplitude value at an ASS access point, acquiring current components of corresponding frequencies of a generator and a system side by means of FFT, and acquiring a shunt coefficient of the subsynchronous / supersynchronous current according to amplitude values of thegenerator current and the injected current. The control strategy only takes single-frequency modulation damping control of the subsynchronous current or the supersynchronous current into account, andis high in damping suppression capability. The optimization design strategy can perform corresponding optimization on suppression effects of different damping control strategies, and can enhance thesuppression capabilities thereof.
Description
technical field [0001] The invention belongs to the field of damping control strategy optimization, in particular to a novel parallel active subsynchronous oscillation suppressor damping control optimization strategy. Background technique [0002] In order to adapt to my country's energy development strategy and new energy utilization, the new generation of power system in the future will show the characteristics of multi-source, multi-transformation and complex AC-DC hybrid connection. In addition to traditional large-scale thermal power and hydropower bases, large-scale wind power and large-scale photovoltaic generator bases are also included. These large-scale centralized power plants are usually far away from the load center, so they need large-capacity, high-voltage, long-distance power transmission mode. High-voltage traditional or multi-terminal flexible DC transmission and fixed or controllable series-compensated AC transmission are economical and effective measures...
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Login to View More IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 张喜军
Owner 张喜军