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Rapid three-phase voltage phase-locked loop method and dynamic response performance analyzing method thereof

A three-phase voltage and analysis method technology, applied in instruments, control/regulation systems, simulators, etc., can solve problems such as insufficient frequency adaptability, complex implementation, and difficult parameter design.

Inactive Publication Date: 2016-07-20
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the grid voltage is unbalanced and there are harmonics, this method is difficult to obtain satisfactory phase-locking performance
In order to improve the phase-locked performance of the system when the voltage is unbalanced and the incoming voltage has harmonics, it is necessary to improve the structure of the phase-locked loop. The positive sequence component of the voltage is extracted, thereby effectively suppressing the influence of the negative sequence component on the system, but this method adds an all-pass filter, and the frequency adaptability is insufficient
2) The phase-locked loop method based on the decoupling of the dual synchronous coordinate system is to decouple the positive sequence component and the negative sequence component of the grid voltage, and control them in two rotating coordinate systems respectively, so as to improve the phase locking performance; but this This method is complex to implement and difficult to design parameters

Method used

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  • Rapid three-phase voltage phase-locked loop method and dynamic response performance analyzing method thereof
  • Rapid three-phase voltage phase-locked loop method and dynamic response performance analyzing method thereof
  • Rapid three-phase voltage phase-locked loop method and dynamic response performance analyzing method thereof

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Embodiment 1

[0064] see figure 1 , Embodiment 1 provides a fast three-phase voltage phase-locked loop method, comprising the following steps:

[0065] 101. The three-phase voltage sampling value U of a, b, and c a , U b and U c The voltage U is obtained by Clark transformation α , U β .

[0066] 102. The voltage U obtained in step 101 α , U β The voltage U is obtained by Park transformation d , U q , U d is the reactive component, U q is the active component.

[0067] 103. The voltage U obtained by Park transformation in step 102 d After the first-order inertial filter filters out the high-order harmonics, the U q and filtered U d The ratio U q / U d , then U q / U d sent to the PI regulator, and adjusted by the PI regulator to make U q / U d tends to 0. Wherein, the filtering method and transfer function of the first-order inertial filter are well known to those skilled in the art, so detailed description is omitted.

[0068] 104. Adjust U in step 103 q / U d When it ...

Embodiment 2

[0081] see figure 2 , embodiment 2 provides the dynamic response performance analysis method of the fast three-phase voltage phase-locked loop method that embodiment 1 provides, and this analysis method comprises the following steps:

[0082] 201. Establish a simplified model of a three-phase voltage phase-locked loop.

[0083] Wherein, step 201 specifically includes:

[0084] (1) see Figure 5 , to establish a simplified mathematical model of a three-phase voltage phase-locked loop.

[0085] Among them, both the traditional three-phase voltage phase-locked loop and the high-speed three-phase voltage phase-locked loop adopt the above-mentioned model.

[0086] Among them, in the above model, the F of the traditional three-phase voltage phase-locked loop 1 (θ)=sinΔθ, F of the high-speed phase-locked loop 2 (θ) = tanΔθ.

[0087] (2) see Figure 6 , according to the simplified mathematical model of the three-phase voltage phase-locked loop established in step (1), the frequen...

Embodiment 3

[0110] Embodiment 3 discloses the basic structure and principle of the traditional phase-locking method. Assume that the grid voltage is a three-phase balanced voltage amplitude of U m , the fundamental angular frequency is ω 0 , the initial phase angle of phase A voltage is 0, then the three-phase grid voltage can be expressed as the following formula.

[0111]

[0112] Assuming that the initial actual angle of the grid voltage vector is θ, the three-phase grid voltage is transformed from a three-phase static coordinate system to a two-phase static coordinate system through Clarke transformation, and then oriented by the D axis, and the phase-locked loop outputs the phase angle Perform Park transformation for the rotation angle, transform the two-phase stationary coordinate system into the synchronously rotating dq coordinate system, and the following formula can be obtained.

[0113]

[0114]

[0115] In order to further simplify the above two formulas, set the e...

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Abstract

The invention discloses a rapid three-phase voltage phase-locked loop method and a dynamic response performance analyzing method thereof, and belongs to the technical field of electric power and electronic control. The analyzing method comprises the following steps: establishing a simplified model of a phase-locked loop, obtaining an open-loop transfer function of a traditional three-phase voltage phase-locked loop and a high-speed three-phase voltage phase-locked loop based on the simplified model, and obtaining a root locus of the changes of a PI regulator parameter Kp based on the open-loop transfer function, a sampling frequency and a fundamental wave angular frequency; drawing two root loci in the same coordinate system, performing equivalent simplification on a high-order system to a typical second order system through the method of closed loop dominant apices, and obtaining convergence time t1 and t2 of the typical second order system in correspondence to the traditional three-phase voltage phase-closed loop and the high-speed three phase voltage phase-locked loop. The analyzing method begins with a simplified mathematics model from a rapid three-phase voltage phase-closed loop structure, conducts separate and detailed discussion on time domain and frequency domain mathematics models, and at the same time demonstrates a theory analysis based on a relevant simulation platform and a hardware experiment platform.

Description

technical field [0001] The invention relates to the field of power electronic control, in particular to a fast three-phase voltage phase-locked loop method and a dynamic response performance analysis method thereof. Background technique [0002] In recent years, with the aggravation of environmental pollution and the shortage of fossil energy, the development and utilization of renewable energy has attracted more and more countries' attention. Distributed power generation system has become a new energy comprehensive utilization method with a huge development market due to its characteristics of low initial investment and flexible power generation methods. As the energy interface unit between the distributed generation system and the public access point of the grid, the three-phase PWM grid-connected converter is an extremely important part of the distributed generation system. [0003] Three-phase PWM grid-connected converters have been widely used due to their advantages o...

Claims

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Application Information

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IPC IPC(8): G05B17/02
CPCG05B17/02
Inventor 尹泉王庆义刘洋罗慧
Owner HUAZHONG UNIV OF SCI & TECH
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