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A control method for current source converter without grid voltage sensor

A technology for converter control and grid voltage, applied in single-network parallel feeding arrangement, AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as complex control structure and the need for voltage sensors

Active Publication Date: 2020-11-10
HEBEI HUINENG XINYUAN ELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The second type is the control strategy based on the stationary coordinate system, which is characterized by no need for rotating coordinate transformation, but requires a phase-locked loop to calculate the positive and negative sequence components of the grid voltage, requires a voltage sensor, and has a complex control structure

Method used

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  • A control method for current source converter without grid voltage sensor
  • A control method for current source converter without grid voltage sensor
  • A control method for current source converter without grid voltage sensor

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Embodiment Construction

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.

[0032] according to figure 1 As shown, a control method of a current source converter without a grid voltage sensor of the present application includes: the fourth parameter I d , the fifth parameter L, the sixth parameter C, the a-phase current value I a , b-phase current value I b , c-phase current value I c , where L=L 1 =L 2 =L 3 , C=C 1 =C 2 =C 3 .

[0033] DC side large inductance L 4 , L 5 Instead of a current source, flow through a large inductor L 4 , L 5 The current is the fourth parameter I d .

[0034] according to figu...

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Abstract

The invention discloses a control method of a sensorless power source converter. The control method is implemented under an abc coordinate system and comprises the steps of estimating a voltage by parameter calculation, wherein a first parameter, a second parameter, a third parameter, a fourth parameter, a fifth parameter, a sixth parameter, a seventh parameter, an eighth parameter, an a-phase voltage estimation value, a b-phase voltage estimation value and a c-phase voltage estimation value are contained; and generating a reference current by calculation, wherein an a-phase current referencevalue, a b-phase current reference value and c-phase current reference value are contained, and the purpose of current closed-loop control is achieved. According to the control method, a switch signalgeneration circuit is simple in structure, and the control method can be implemented by a digital control circuit.

Description

technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to a control method for a current source converter without a grid voltage sensor. Background technique [0002] With the rapid development of power electronics technology, current source converters have attracted the attention of industry and academia. They are used in solid-state transformer systems, uninterruptible power supply systems, multi-electric aircraft power systems, photovoltaic power generation systems, wind power generation systems, and high-voltage direct current transmission systems. , flexible AC transmission systems and other fields have received more and more attention. When the current source converter is connected to the grid, the operation of the grid will have an impact on the current source converter, and necessary control needs to be taken to ensure the stable operation of the system. For example, in the case of harmonics and unbalance in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24H02J3/01
CPCH02J3/01H02J3/24H02J3/38Y02E40/40
Inventor 郭小强王超哲白宇王宝诚卢志刚
Owner HEBEI HUINENG XINYUAN ELECTRONICS TECH CO LTD
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