Multi-scale inertia control method and additional controller based on converter grid-connected equipment
An inertia control and converter technology, applied in the field of multi-scale inertia control methods and additional controllers, can solve the problems of not considering the frequency change rate of the power grid, unable to efficiently coordinate the power system to provide multi-scale inertia support, etc.
Active Publication Date: 2022-05-13
HUAZHONG UNIV OF SCI & TECH
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[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a multi-scale inertia control method and an additional controller based on converter grid-connected equipment, aiming to solve the problem that the existing additional inertia control method does not take into account the grid frequency change rate The influence of speed on the relationship between active / reactive power and amplitude / frequency of the system makes it impossible to efficiently and coordinately provide multi-scale inertia support for the power system
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[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0035]The invention provides a multi-scale inertia control method and an additional controller based on converter grid-connected equipment, which solves the problem that the existing additional inertia control method does not take into account the influence of the speed of the frequency change rate of the grid on the system active / reactive power and amplitude Influenced by the frequency / frequency relationship, there is no additional control design for different time-scale control modules in combination with the speed of frequency change rate, resulting in the inability to efficiently and coordinatel...
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The invention discloses a multi-scale inertia control method based on converter grid-connected equipment and an additional controller, including: according to the time response speed of the disturbance, the control module of the converter grid-connected equipment is divided into DC voltage control scale and AC Current control scale module; pass the q-axis component of the terminal voltage under the phase-locked coordinate system through filters and signal conversion modules of different frequency bands, and output control signals corresponding to the different time scale control modules; control the low frequency band and the high frequency band The signals are respectively added to the active branch of the DC voltage control scale module and the reactive branch of the AC current control scale module, so as to make full use of the different responses of the active / reactive branches of the converter grid-connected equipment to the signals of different time scales of the system, Efficiently and coordinately provide inertia support for different time scales of the system. In addition, the present invention does not additionally increase the number of sensors and change the active / reactive power injected into the grid by the converter grid-connected equipment in a steady state.
Description
technical field [0001] The invention belongs to the technical field of power system frequency stability control, and more specifically relates to a multi-scale inertia control method and an additional controller based on converter grid-connected equipment. Background technique [0002] With the rapid and continuous development of power electronics technology, the penetration rate of voltage source converters in power systems is getting higher and higher, and its influence on the voltage amplitude / frequency dynamic process that power systems are concerned about is also increasing. In order to output constant active / reactive power, the output voltage amplitude / frequency of the converter grid-connected equipment will quickly follow the change of the grid voltage amplitude / frequency, so it is difficult to provide effective inertia support for the power system. In recent years, due to insufficient power grid inertia support capacity, there have been many blackouts, such as the "9...
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IPC IPC(8): H02J3/38H02J3/46
CPCH02J3/38H02J3/46
Inventor 袁小明周蓉李胜何维
Owner HUAZHONG UNIV OF SCI & TECH