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SNOP double-closed-loop control system and method based on SVPWM modulation

A double-closed-loop control and controller technology, applied in the direction of output power conversion devices, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of unstable switching frequency, difficulty in using SNOP to control multiple electrical variables at the same time, and avoid Fluctuation problem, realization of speed and accuracy, cost reduction effect

Pending Publication Date: 2021-12-10
SHANGHAI DIANJI UNIV
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Problems solved by technology

However, the existing traditional hysteresis-based direct current control method has the defect of unstable switching frequency, and the direct current control method is difficult to apply to SNOP to achieve its purpose of simultaneously controlling multiple electrical variables

Method used

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  • SNOP double-closed-loop control system and method based on SVPWM modulation
  • SNOP double-closed-loop control system and method based on SVPWM modulation
  • SNOP double-closed-loop control system and method based on SVPWM modulation

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0037] The structure topology of SNOP is as follows figure 1 As shown, its function is to realize the transmission of active power between the feeders and provide reactive power to the feeders on both sides respectively. Because the work of SNOP is based on the fully-controlled power electronic devices, it has flexible control of active and reactive power. sex and continuity. When the SNOP is running in a steady state, ignoring the power loss in the SNOP, the active power flowing into one end of the SNOP is equal to the active power flowing out of the other end, and only using the VS...

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Abstract

The invention relates to an SNOP double-closed-loop control system and method based on SVPWM modulation. The SNOP comprises a converter VSC1 and a converter VSC2, the double-closed-loop control system comprises a VSC1 double-closed-loop control part, a VSC2 double-closed-loop control part and an SVPWM modulation part, the SVPWM modulation part comprises a coordinate conversion unit for performing coordinate conversion on the output quantity of the VSC1 double-closed-loop control part and the VSC2 double-closed-loop control part to obtain a reference voltage vector after coordinate conversion, a sector selection unit for determining sectors according to the reference voltage vectors after coordinate transformation and determining action time of each space vector, and a signal generation unit for generating a modulation wave of a space vector so as to control the on-off state of each bridge arm IGBT of the converter VSC1 and the converter VSC2. Compared with the prior art, the method has the advantages that the economical efficiency and the control stability of the SNOP are improved, and the like.

Description

technical field [0001] The invention relates to a SNOP control modulation system, in particular to a SVPWM modulation-based SNOP double-closed-loop control system and method. Background technique [0002] Intelligent soft switch (Soft Normally-Open Point, SNOP) generally adopts the traditional carrier PWM modulation technology at present, and obtains the switching pulse width control signal through the comparison of the carrier wave and the modulating wave, which has the advantages of high precision, fast response, and high precision. very broad. When applied to SNOP, the input signal of the PWM modulation system, that is, the modulation ratio, is greatly affected by the reactive component of the system voltage, and the reactive component of the system voltage is sometimes positive and sometimes negative due to the existence of capacitance and reactive components in the system. , resulting in the instability of the control system based on PWM modulation technology. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M7/5387H02M7/5395H02J3/36
CPCH02M7/219H02M7/53875H02M7/5395H02J3/36Y02E60/60Y02B70/10
Inventor 江舟邹海荣
Owner SHANGHAI DIANJI UNIV
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