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Inter-line power flow controller oscillation suppression method by considering new energy fluctuation

A technology of power flow controller and new energy, applied to AC networks with the same frequency from different sources, reducing/preventing power oscillation, AC network circuits, etc., can solve problems such as load disturbances

Active Publication Date: 2020-11-13
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +4
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, in the process of forced oscillation, due to the failure of the system itself, or operations such as switching off and closing, it will bring about low-frequency oscillations in the form of negative damping; on the other hand, due to the diversity of power system loads, forced power oscillations may cause Some loads have a new periodic disturbance, causing a new resonance

Method used

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  • Inter-line power flow controller oscillation suppression method by considering new energy fluctuation
  • Inter-line power flow controller oscillation suppression method by considering new energy fluctuation
  • Inter-line power flow controller oscillation suppression method by considering new energy fluctuation

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Embodiment Construction

[0048] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0049] like figure 1 As shown, the oscillation suppression method of the line power flow controller considering new energy fluctuations in the present invention specifically includes the following steps:

[0050] (1) if figure 2As shown, the interline power flow controller (IPFC) is composed of multiple voltage source converters (VSC), these converters share the DC bus, and are connected to different transmission lines through series coupling transformers, so as to be applied to multiple channels Power flow regulation, oscillation damping and transient stability control. Considering the volatility of renewable energy, low-frequency oscillation disturbance components of different frequencies are sequentially added to the local power grid near the IPFC to analyze the characteristics of the forced low-frequency oscillation of...

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Abstract

The invention discloses an inter-line power flow controller oscillation suppression method by considering new energy fluctuation, relates to the fluctuation of renewable energy, provides an IPFC additional controller based on inherent frequency offset, quantifies the interaction effect between targets, and selects the superposition position of the additional controller. By compensating the synchronous torque coefficient of the specific oscillation mode, the inherent frequency of the mode is influenced, and the condition of forced oscillation generation is destroyed. Furthermore, an IPFC controller is improved into a multi-channel additional controller, a wide-adaptability forced oscillation suppression method considering new energy fluctuation is obtained on the premise of identifying andpositioning oscillation signals and determining disturbance source influence factors, and technical help is provided for the IPFC to deal with complex power oscillation under multiple disturbances ina multi-machine system.

Description

technical field [0001] The invention relates to the field of electric power system control, in particular to an oscillation suppression method for an inter-line power flow controller taking into account fluctuations in new energy sources. Background technique [0002] With the continuous development of new energy technologies, large-scale external water / wind / light and other new energy sources are continuously connected to the power system, which may introduce oscillation disturbance signals of different frequencies, which increases the diversity and invariance of low-frequency oscillation disturbance sources in the power system. Determinism, which may lead to the forced oscillation problem of power systems with different oscillation frequencies. It not only increases the difficulty of the operation and control of the power grid, but also brings great security risks to the system operation. [0003] The forced oscillation has a long duration and a wide range of influence, an...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/06
CPCH02J3/06H02J3/241H02J2203/10H02J2203/20
Inventor 李群吴熙高伯阳刘建坤曹冬明邓占峰张宁宇周建华
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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