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New energy grid connected system subsynchronous/supersynchronous oscillation adaptive monitoring method

A sub-synchronous oscillation and super-synchronous technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as monitoring without considering sub-/super-synchronous harmonic phasors

Inactive Publication Date: 2018-12-07
CHINA SOUTHERN POWER GRID COMPANY
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Problems solved by technology

Changes in system operating conditions and network topology lead to time-varying characteristics of the oscillation frequency of the new SSO, which brings new challenges to dynamic monitoring
Existing studies only consider the phasor monitoring of the fundamental frequency component with a fixed frequency, and do not consider the monitoring of sub / supersynchronous harmonic phasors with time-varying frequency characteristics

Method used

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  • New energy grid connected system subsynchronous/supersynchronous oscillation adaptive monitoring method
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  • New energy grid connected system subsynchronous/supersynchronous oscillation adaptive monitoring method

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Embodiment Construction

[0041] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] The new energy grid-connected system sub / super synchronous oscillation self-adaptive monitoring method of the present invention, as attached figure 1 shown, including the following steps:

[0043] (1) Collect voltage / current signals in the new energy grid-connected system and perform signal preprocessing;

[0044] (2) Use the fast sub / supersynchronous oscillation monitoring algorithm to judge whether subsynchronous oscillation occurs in the system, if so, perform step (3), otherwise, return to step (1);

[0045] (3) Send early warning information to the control center;

[0046] (4) Use the sub / supersynchronous oscillation identification algorithm to accurately identify the frequency of the subsynchronous oscillation in the system, and calculate the frequency of the supersynchronous signal according ...

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Abstract

A new energy grid connected system subsynchronous / supersynchronous oscillation adaptive monitoring method comprises the following steps: 1, preprocessing acquired signals; 2, using a subsynchronous / supersynchronous oscillation monitoring algorithm to fast determine whether subsynchronous oscillation has happened or not; 3, sending an early warning; 4, using a subsynchronous / supersynchronous oscillation identification algorithm to identify a subsynchronous oscillation frequency and calculate a supersynchronous signal frequency; 5, using mode filtering to extract fundamental wave, subsynchronousharmonic wave and supersynchronous harmonic wave signals; 6, using a DFT phasor algorithm to respectively calculate a fundamental wave phasor, a subsynchronous harmonic wave phasor, and a supersynchronous harmonic wave phasor for the step 5; 7, making amplitude and phase compensation after phasor calculation in step 6. The method can fast monitor whether the power system has subsynchronous oscillations or not, can provide information that shows a frequency range to which the oscillation frequency belongs, and can send early warning information to a control center; the method can further accurately identify the oscillation frequency, and can adaptively adjust a filter characteristic frequency according to the detected oscillation frequency, thus accurately calculating the fundamental wavephasor, the subsynchronous harmonic wave phasor, and the supersynchronous harmonic wave phasor.

Description

technical field [0001] The invention relates to a new energy grid-connected system sub / super synchronous oscillation self-adaptive monitoring method. Background technique [0002] In recent years, sub / supersynchronous oscillation (SSO) problems have appeared in my country's new renewable energy (wind power, photovoltaic) grid-connected systems, which seriously threatens the safe and stable operation of the system. The frequency of SSO is higher than that of traditional low-frequency oscillation, and it has obvious time-varying characteristics. However, the existing phasor measurement units (PMUs) and wide area measurement systems (WAMS) with dynamic monitoring functions cannot meet the needs of sub / supersynchronous oscillation dynamic monitoring. This is because conventional PMUs only measure fundamental frequency phasors and ignore the effects of sub / supersynchronous phasors. In order to ensure the measurement accuracy of the fundamental frequency phasor, the filter in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16G01R31/08
CPCG01R23/16G01R31/088
Inventor 李金张喜铭胡荣周华锋
Owner CHINA SOUTHERN POWER GRID COMPANY
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