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Inverse direct power control method of grid connection converter

A power control and converter technology, which is applied in the field of reverse direct power control of grid-connected converters, can solve problems such as large amount of computation, high dependence on mathematical model parameters, and weak robustness

Active Publication Date: 2015-05-13
ZHEJIANG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

DPC based on PI controller and space vector modulation (SVM) can obtain smaller power fluctuation and constant switching frequency, but the introduction of PI controller makes it have the same problems as VC. In addition, this method has no effect on the mathematical model The parameter dependence degree is high, so the robustness is not strong
Predictive direct power control (P-DPC) that selects three vectors in one sampling time can also obtain better steady-state and dynamic performance, and the switching frequency is constant, but it needs to calculate the action time of the three vectors in real time, and the calculation amount is relatively large. Large, vector selection is more complicated

Method used

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  • Inverse direct power control method of grid connection converter
  • Inverse direct power control method of grid connection converter
  • Inverse direct power control method of grid connection converter

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Embodiment Construction

[0035] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036]The grid-connected converter back-stepping direct power control system in this embodiment includes a voltage source type grid-connected converter 1, a voltage sensor 2 for detecting the voltage of the three-phase grid, and a current Hall sensor 3 for detecting the three-phase current. The voltage sensor 4 for detecting the DC bus voltage, the current Hall sensor 5 for detecting the load current on the DC side, and the control loop for adjusting the output active and reactive power of the grid-connected converter. The control loop is composed of a feedback signal processing channel and a forward control channel, wherein the feedback signal processing channel includes a digital phase-locked loop module 6, which is used to obtain the stator voltage in t...

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Abstract

The invention discloses an inverse direct power control method of a grid connection converter. According to the method, a reverse algorithm is combined with a DPC (Dynamic Power Control) technology; firstly an active power reference value and a change rate thereof are obtained through a voltage outer loop reverse controller and then input into a power inner ring reverse controller together with a passive power reference value, so a voltage reference value output by the grid connection converter can be calculated, and a switch signal is obtained through modulation of a SVPWM (Space Vector Pulse Width Modulation) module. The entire control process is performed in a static coordinate system without changing a rotary coordinate; only three adjustable parameters are required to be adjusted to realize progressive tracking of voltage of a direct current bus of the converter, meanwhile effective control of active and passive power and quick response of the system are realized, and the control structure is extremely concise. The current harmonic and the power fluctuation can be reduced while the superior dynamic performance of the conventional DPC is inherited, so the voltage of the direct current bus is more stable, constant switching frequency is obtained, and good stable and dynamic performance is realized.

Description

technical field [0001] The invention belongs to the technical field of electric power equipment control, and in particular relates to a back-pickup direct power control method of a grid-connected converter. Background technique [0002] With the aggravation of the energy crisis and the enhancement of people's awareness of environmental protection, the development and utilization of renewable energy such as wind power and photovoltaic power generation, as well as distributed power generation technology and high-voltage direct current transmission technology (HVDC) have achieved unprecedented development. The voltage-type grid-connected converter is widely used in the fields of renewable energy distributed power generation and high-voltage direct current transmission because of its good input and output characteristics, independent adjustment of active power and reactive power, etc. It also has a very important role and status. [0003] Vector control (VC) and direct power co...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 孙丹王霄鹤方扬邓伦杰
Owner ZHEJIANG UNIV
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