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Dynamic reactive compensation control method applied to alternating current-direct current hybrid transmission power grid

A technology of AC/DC hybrid and compensation control, which is applied in reactive power compensation, reactive power adjustment/elimination/compensation, general control system, etc., and can solve problems such as reducing system transient stability

Inactive Publication Date: 2012-08-01
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
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Problems solved by technology

Therefore, after the DC is blocked, the dynamic reactive power equipment will not only have no transient supplementary power to be put into operation, but will also release part of the inductive reactive power, which reduces the transient stability of the system

Method used

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  • Dynamic reactive compensation control method applied to alternating current-direct current hybrid transmission power grid
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  • Dynamic reactive compensation control method applied to alternating current-direct current hybrid transmission power grid

Examples

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Embodiment approach

[0038] (1) Introduce line power of important AC section:

[0039] Using the small signal analysis method, inject reactive power step disturbance ΔQ(t) at the installation point of SVC or STATCOM, and use the transient simulation analysis method to obtain the active power response ΔP of each important AC line i (t), i=1, . . . , N. According to the dominant frequency ω that exists in the large interval, select the power ΔP of the line l with the dominant frequency ω (that is, the low-frequency oscillation frequency) and the maximum observability l (t), (l ∈ 1,..., N) as the wide-area input signal of the reactive power compensation device. Generally, the power of the inter-area tie line can be directly selected as the wide-area input signal.

[0040] (2) Additional (wide area) controller parameter setting:

[0041] Input and output responses ΔQ(t) and ΔP derived from small signal analysis l (t), find the open-loop transfer function G 0 (s) = ΔP l (s) / ΔQ(s), such as image...

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Abstract

The invention discloses a dynamic reactive compensation control method applied to an alternating current and direct current hybrid transmission power grid. For a dynamic reactive compensation device in the alternating current-direct current hybrid transmission power grid, important alternating current section line power is selected as a wide area input signal of an additional controller, parameters of the additional controller are set according to a control aim, an output signal of the additional controller is superposed with an output signal of a master controller to generate a dynamic reactive power signal, and the dynamic reactive power signal is output to a low-voltage bus of a transformation substation to enhance the transient stability and dynamic damping level of first oscillation of a system. Actual requirements on reactive power when the system has an alternating current failure and a direct current failure can be truly reflected, and the transient and dynamic stability of the system after an alternating current failure and a direct current locking failure of the alternating current-direct current hybrid transmission power grid can be improved.

Description

technical field [0001] The invention relates to a dynamic reactive power compensation method of an electric power system, in particular to a dynamic reactive power compensation method of an AC / DC hybrid external transmission network. Background technique [0002] Technical terms used in the present invention: [0003] Dynamic reactive power compensation device: based on high-power power electronic component technology, it realizes the setting of dynamic reactive power compensation in the transient process of the power system, such as static var compensator SVC (Static Var Compensator) and static synchronous compensator STATCOM (Static Synchronous Compensator ). [0004] AC-DC hybrid power grid: When the AC grid contains the converter station of the DC project, it can realize the mixed transmission mode of the AC grid and the DC grid. [0005] Wide Area Measurement System (WAMS): Based on synchrophasor measurement technology, it is a real-time monitoring system aimed at mon...

Claims

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Application Information

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IPC IPC(8): H02J3/18
CPCH02J3/18Y02E40/30G05B15/02H02J3/02
Inventor 丁理杰王彪汤凡张华
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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