Output differential feedback based adaptive control method of virtual synchronizer

A virtual synchronous machine and self-adaptive control technology, applied in reactive power compensation, AC network voltage adjustment, single-network parallel feed arrangement, etc., can solve problems such as threats to power grid stability, power grid frequency exceeding, and system off-grid operation. Achieve the effect of avoiding repeated charging and discharging process, suppressing power overshoot, and speeding up the adjustment process

Active Publication Date: 2018-08-17
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a virtual synchronous machine adaptive control method based on output differential feedback, which solves the problem that under the existing technical conditions, the system active frequency modulation characteristics and system damping characteristics cannot be taken into account so that the system can effectivel

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  • Output differential feedback based adaptive control method of virtual synchronizer
  • Output differential feedback based adaptive control method of virtual synchronizer
  • Output differential feedback based adaptive control method of virtual synchronizer

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[0041] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0042] Reference figure 1 The system structure of the present invention based on the adaptive control method of the virtual synchronous machine based on output differential feedback is to include a three-phase full-bridge inverter. The output of the three-phase full-bridge inverter is integrated into the power grid through the LC filter circuit and connected to the grid. A set of current sensors ( figure 1 CSa, CSb and CSc) and two sets of voltage sensors ( figure 1 In VSa, VSb and VSc and VSga, VSgb and VSgc); two sets of voltage sensors collect the three-phase voltage signal output by the inverter and the three-phase voltage signal of the power grid respectively, and obtain the corresponding digital data through the A / D module (analog-digital conversion circuit) Then connect the inverter output voltage amplitude calculation module and the grid voltage ampl...

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Abstract

The invention discloses an output differential feedback based adaptive control method of a virtual synchronizer. The method comprises the steps that 1) an output current, an output voltage and a power-grid voltage of a three-phase full-bridge inverter are collected and converted into digital quantities respectively; 2) excitation of the virtual synchronizer is output via reactive voltage regulation control, and an output voltage amplitude and a power-grid voltage amplitude are calculated; 3) active power, reactive power and excitation electromotive force of the system are calculated; 4) speedfeedback control is realized, and an initial value of a speed feedback coefficient is calculated; 5) active frequency modulation control is realized, virtual synchronizing angular velocity and phase are output, and a rotating speed difference and an angular acceleration of the virtual synchronizer are calculated; 6) adaptive regulation rules of the virtual inertia moment and speed feedback coefficient are set; 7) CLARK transformation is carried out to obtain a voltage quantity in an alpha-beta static coordinate system; and 8) spatial vector modulation is carried out to obtain six paths of control switch pulses of the three-phase full-bridge inverter, and thus, three-phase AC feedback power grid is realized.

Description

technical field [0001] The invention belongs to the technical field of grid-connected control of renewable new energy power generation, and relates to an adaptive control method of a virtual synchronous machine based on output differential feedback. Background technique [0002] With the shortage of fossil energy and the limitation of carbon dioxide emissions, the proportion of renewable new energy power generation to the total power generation continues to increase. Renewable new energy power generation is generally connected to the grid through power electronic converters, without the rotor and large rotation of traditional generators. Inertia is not conducive to grid stability. To solve this problem, virtual synchronous generator technology makes new energy generation nodes have similar external characteristics to traditional synchronous generators by simulating the external characteristics of synchronous generators, which improves the stability of power grid systems cont...

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Application Information

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IPC IPC(8): H02J3/46H02J3/16
CPCH02J3/16H02J3/46Y02E40/30
Inventor 任海鹏陈琦李洁
Owner XIAN UNIV OF TECH
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