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An Algorithm for Instantaneous Power Calculation and Frequency Compensation Without Phase-Locked Loop in Single-phase System

A non-phase-locked loop, frequency compensation technology, applied in the direction of irreversible AC power input conversion to DC power output, etc., can solve the problem of increasing system complexity and difficulty in hardware and software design, inability to accurately calculate instantaneous power, single-phase system network Problems such as pressure-locking difficulties, etc., to achieve the effect of small space, simple algorithm and high precision

Active Publication Date: 2016-08-24
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

In this regard, it is proposed to use a microprocessor to collect the grid-side voltage and current signals, store and delay to obtain a virtual grid-side voltage and current signal orthogonal to the grid-side voltage and current, and use it to calculate the instantaneous power of the single-phase system. However, this algorithm takes up Too much memory space, and when the voltage and current suddenly change, the instantaneous power cannot be accurately calculated
In order to realize the direct power control of the single-phase pulse rectifier, the grid-side voltage phase-locked loop is needed. However, the phase-locking of the grid voltage of the single-phase system is relatively difficult. Generally, it is necessary to realize the phase-locking of the single-phase system through a virtual signal orthogonal to the grid voltage or use Hardware phase-locked, so single-phase system network voltage phase-locked loop increases system complexity and difficulty in software and hardware design

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  • An Algorithm for Instantaneous Power Calculation and Frequency Compensation Without Phase-Locked Loop in Single-phase System
  • An Algorithm for Instantaneous Power Calculation and Frequency Compensation Without Phase-Locked Loop in Single-phase System
  • An Algorithm for Instantaneous Power Calculation and Frequency Compensation Without Phase-Locked Loop in Single-phase System

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Embodiment Construction

[0033] figure 1 Shown is a block diagram of the functional division of a single-phase direct power control system without a phase-locked loop. The whole system can be divided into local sine and cosine signal calculation 01, grid side voltage and current acquisition 02, single-phase non-PLL power calculation 03, network voltage amplitude calculation 04, frequency compensation matrix component calculation 05, frequency compensation matrix 06, direct power Control 07, space vector pulse width modulation 08, voltage PI outer loop control 09, power frequency coordinate transformation 10 ten parts. The specific contents of the main parts are:

[0034] (1) Local sine and cosine signal calculation 01

[0035] Through the timing interrupt of the microcontroller, the sine and cosine signals equal to the angular frequency of the power frequency are sent out in the control cycle or sampling cycle, which is single-phase non-phase-locked loop power calculation 03, network voltage amplitu...

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Abstract

The invention discloses a single-phase system non-phase-locked loop instantaneous power calculation and non-phase-locked loop frequency compensation algorithm, which mainly includes two parts: single-phase non-phase-locked loop power calculation 03 and frequency compensation matrix component calculation 05. Sin-cosine signal 01, digital filter and simple operation can realize the calculation of instantaneous power of single-phase system, and calculation of frequency compensation matrix components, without using phase-locked loop, which reduces the difficulty of phase-locked loop design, thereby reducing software and hardware design difficulty.

Description

technical field [0001] The invention relates to the field of design and manufacture of a single-phase PWM converter (including a pulse rectifier and a PWM inverter) control system in the field of power electronics and power transmission. Background technique [0002] Single-phase pulse rectifiers have the advantages of bidirectional energy flow, grid side voltage and current maintain unity power factor, and DC side voltage is constant, so they are widely used in high-power traction drive systems. At present, the control algorithm of single-phase rectifier mainly includes indirect current control, hysteresis current control, transient current control and dq axis current decoupling control. [0003] In order to improve the control accuracy and dynamic performance of the rectifier, a direct power control algorithm suitable for three-phase rectifiers is proposed. This algorithm is based on the theory of instantaneous power, directly controls active power and reactive power, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12
Inventor 宋文胜马俊鹏熊成林冯晓云葛兴来王青元
Owner SOUTHWEST JIAOTONG UNIV
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