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A Control Method for Compound Virtual Synchronous Machine Applicable to Unbalanced Conditions

A technology of virtual synchronous machine and control method, which is applied in the direction of single-network parallel feeding arrangement, multi-phase network asymmetry reduction, multi-phase network elimination/reduction asymmetry, etc., can solve the problem of inability to provide voltage and frequency support for the system, etc. problems, resulting in optimal output performance, improved power and current quality, and increased capability with unbalanced loads

Active Publication Date: 2021-06-22
HARBIN INST OF TECH
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Problems solved by technology

[0004] Aiming at the problem that the existing inverter VSG control method suitable for unbalanced conditions cannot provide voltage and frequency support for the system, the present invention proposes a composite VSG control method suitable for unbalanced conditions. The operating performance of the inverter under the condition of unbalanced grid voltage can ensure that the basic properties of VSG voltage source control are not changed, and provide voltage and frequency support for the system

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  • A Control Method for Compound Virtual Synchronous Machine Applicable to Unbalanced Conditions
  • A Control Method for Compound Virtual Synchronous Machine Applicable to Unbalanced Conditions
  • A Control Method for Compound Virtual Synchronous Machine Applicable to Unbalanced Conditions

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Embodiment 1

[0054] figure 1 It is an inverter topology and an overall control method based on VSG control, which shows that the method of the present invention is based on a three-phase inverter. figure 2 Is the traditional VSG control algorithm block diagram. The compound virtual synchronous generator control method suitable for unbalanced power grid and load conditions provided by the present invention, its overall control block diagram is as follows image 3 As shown, it mainly includes three parts: power calculation and VSG control, voltage loop and current loop. Specifically include the following steps:

[0055] Step 1, power calculation and VSG control part such as Figure 4 As shown, the inverter output voltage u obtained by sampling oa , u ob , u oc and current i oa i ob i oc The signal is processed, and the positive and negative sequence components of the output voltage and current are obtained through the positive and negative sequence separation module, and then the p...

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Abstract

The invention provides a compound virtual synchronous machine control method suitable for unbalanced conditions, and belongs to the technical field of virtual synchronous machine control. The method is as follows: Step 1, calculate the positive-sequence fundamental wave active power and positive-sequence fundamental wave reactive power output by the inverter; Step 2, use the virtual speed control loop to obtain the phase command of the inverter output voltage; Step 3, use The virtual excitation control loop obtains the amplitude command of the inverter output voltage, and combines the phase command to obtain the reference voltage; step 4, adding virtual impedance control to the voltage loop and using positive sequence virtual impedance control to decouple active power and reactive power; Step 5. Correct the reference current value of step 4, and set the coefficient N to coordinate the control of power fluctuation and current quality; Step 6, set the coefficient k to select the reference current to obtain the actual reference current value of the current loop; Step 7, sample the inductor current , using the current loop to perform quasi-PR control on the current reference value and the inductor current to obtain a modulation signal.

Description

technical field [0001] The invention relates to a compound virtual synchronous machine control method suitable for unbalanced conditions, and belongs to the technical field of virtual synchronous machine control. Background technique [0002] With the increase of the penetration rate of Distributed Generators (DG) in the power grid, the characteristics of low inertia and under-damping of the interface between DG power generation and power electronic devices make the power grid more susceptible to interference from the external environment than traditional power grids. It is conducive to the safe and stable operation of the power grid. In order to solve the stability problem caused by the large-scale access of distributed power to the grid, relevant scholars proposed a control method of virtual synchronous generator (VSG). By simulating the working principle of the synchronous generator, the VSG control makes the inverter have the external characteristics of frequency modula...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/40H02J3/26H02J3/16
CPCH02J3/16H02J3/26H02J3/40Y02E40/30Y02E40/50
Inventor 刘桂花王卫李芬郭磊朱凯荆弈翔王文秀
Owner HARBIN INST OF TECH
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