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Adaptive control method of moment of inertia suitable for virtual synchronous generator

A technology of self-adaptive control and moment of inertia, applied in the direction of single-network parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve the problems of inability to utilize the flexibility of the inverter, inability to adjust, and inability to further shorten the time of power frequency oscillation , to improve the acceptability, reduce the adjustment time and optimize the dynamic response

Pending Publication Date: 2019-06-07
TAIYUAN UNIV OF TECH
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Problems solved by technology

However, the moment of inertia J introduced by the rotor motion equation is a constant, which cannot be adjusted in time according to frequency and power changes, and cannot further shorten the power frequency oscillation time, and cannot exert the flexibility of inverter control

Method used

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  • Adaptive control method of moment of inertia suitable for virtual synchronous generator
  • Adaptive control method of moment of inertia suitable for virtual synchronous generator
  • Adaptive control method of moment of inertia suitable for virtual synchronous generator

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Embodiment Construction

[0023] A rotational inertia adaptive control method suitable for virtual synchronous generators, according to the power angle characteristic curve of synchronous generators and the physical meaning of rotational inertia J to frequency and active power under system disturbance, the initial inertia J 0 Adapt to changes based on frequency rate of change.

[0024] In the new energy micro-grid, the DC-side power supply outputs three-phase AC power through the grid-connected inverter, and then connects the load and the power grid after passing through the filter circuit. Detect the current i of the grid-connected inverter after passing through the filter circuit abc and voltage u abc , the active power P and reactive power Q are calculated by the power calculation module, and the voltage frequency f is detected by using a phase-locked loop. Compare the voltage frequency f with the frequency reference value f ref The deviation Δf of ΔP is obtained by droop control, and ΔP is compa...

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Abstract

The present invention discloses an adaptive control method of a moment of inertia suitable for a virtual synchronous generator, and belongs to the field of photovoltaic grid-connected inverters. The method comprises the steps of: determining a moment-of-inertia initial value J0 by employing system parameters, and according to power angle features of a virtual synchronous generator, regulating themoment of inertia in real time in the frequency change process. The method provided by the invention develops the control flexibility of the grid-connected inverter to the maximum extent, can inhibitoscillation when dynamic response of the frequency and the active power is performed, reduces the dynamic response time, considers the system stability and improves the consumption of the new energy power integration.

Description

technical field [0001] The invention belongs to the control field of photovoltaic grid-connected inverters, in particular to a rotational inertia adaptive control method suitable for a virtual synchronous generator. Background technique [0002] With the improvement of people's awareness of environmental protection, a large number of renewable energy sources have been developed and utilized, and a large number of grid-connected inverters have caused the inertia of the power system to decrease, and the system's anti-interference ability has weakened. [0003] In view of the above problems, using the virtual synchronous generator technology, the grid-connected inverter simulates the external characteristics of the synchronous generator to make it have characteristics similar to the synchronous generator, thereby improving the acceptance of distributed renewable energy. The block diagram of virtual synchronous generator control is as follows: figure 1 As shown, the acquisition...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24
Inventor 李岚柴伦王浩李冰王心愉
Owner TAIYUAN UNIV OF TECH
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