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Adaptive virtual synchronous control system and method applied to direct current transmission system

A DC transmission system and virtual synchronization technology, applied in the direction of power transmission AC network, reducing/preventing power oscillation, etc., can solve the problems of system damping reduction, stability degradation, AC grid frequency fluctuations, etc., to slow down violent fluctuations, reduce Effect of power fluctuation and improvement of dynamic performance

Active Publication Date: 2021-11-09
HUNAN UNIV
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Problems solved by technology

[0004] In view of this, it is necessary to address the above-mentioned problems and propose a virtual synchronization controller and method applied to the multi-terminal flexible DC transmission system to solve the aggravated frequency fluctuation of the AC power grid after being connected to the multi-terminal flexible DC transmission system. The problem of damping reduction and decreased stability

Method used

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  • Adaptive virtual synchronous control system and method applied to direct current transmission system
  • Adaptive virtual synchronous control system and method applied to direct current transmission system
  • Adaptive virtual synchronous control system and method applied to direct current transmission system

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Embodiment

[0046] Such as figure 1 , Figure 5 As shown, a DC transmission system ( Figure 5 Briefly shows the circuit structure of the direct current transmission system, because part of the circuit structure of the direct current transmission system is the prior art, so the description will not be expanded), the direct current transmission system includes the converter station (the converter station stand at Figure 5 Marked as VSC in ), the virtual synchronous controller includes the following modules:

[0047] The parameter deviation acquisition module is used to collect the detection parameters of the converter station, and generate the frequency deviation Δω of the AC side bus of the converter station, the frequency change rate dω / dt of the AC side bus of the converter station, and the active power of the AC side bus of the converter station Power output deviation ΔP, voltage amplitude deviation Δ|Vac| of the AC side bus of the converter station, reactive power output deviation...

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Abstract

The invention relates to the technical field of large power grid stability control, and specifically discloses an adaptive virtual synchronous control system applied to a direct current transmission system, including a parameter deviation acquisition module, a parameter self-adaptive adjustment module, a virtual governor control module, and a virtual synchronous machine control module and reactive power control module. The present invention also discloses a control method for an adaptive virtual synchronous control system applied to a direct current transmission system, including: S1: collecting detection parameters and generating parameter deviations; S2: sending parameter deviations; S3: judging the Oscillating state of the AC power grid; S4: Generate the adjustment value of the output power reference value of the converter station; S5: Generate the voltage phase angle signal of the AC side bus of the converter station; S6: Generate the voltage phase angle signal of the AC side bus of the converter station; S7: generate PWM signal. The invention improves the inertia level, overall stability and frequency stability of the AC and DC power grid, and reduces power fluctuations and frequency fluctuations.

Description

technical field [0001] The invention relates to the technical field of large power grid stability control, in particular to an adaptive virtual synchronization control system and method applied to a direct current transmission system. Background technique [0002] In recent years, in order to increase energy supply, optimize energy structure and reduce environmental pollution, more and more renewable energy sources such as wind energy and solar energy have been applied to my country's power system. The utilization of renewable energy is a very important direction of smart grid construction. Among various types of renewable energy, wind energy has been developed with a relatively mature technology and has been applied to a certain extent in the power system. Currently, high-voltage direct current (HVDC, High-Voltage Direct Current) transmission technology is considered to be an effective way to connect large-scale wind farms with the main grid. Especially in terms of long-d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/36
CPCH02J3/24H02J3/36Y02E60/60
Inventor 曹一家王炜宇谭益李勇
Owner HUNAN UNIV
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