Inverter control method without power grid voltage sensor

A control method and grid voltage technology, applied to electrical components, output power conversion devices, and conversion of AC power input to DC power output, etc., can solve problems such as the inability of the inverter system to work stably and normally, and achieve cost savings and control Simplicity and the effect of improving reliability

Active Publication Date: 2021-06-25
CENT SOUTH UNIV
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Problems solved by technology

However, due to the unstable poles in the method based on analog resistance control commonly used to control motors, the existing inverter system will not be stable and work normally; control method

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  • Inverter control method without power grid voltage sensor
  • Inverter control method without power grid voltage sensor
  • Inverter control method without power grid voltage sensor

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Embodiment Construction

[0035] The present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments, and the technical problems and beneficial effects solved by the technical solutions of the present invention are also described. It should be pointed out that the described embodiments are only intended to facilitate the implementation of the present invention understood without any limitation.

[0036] As an embodiment of the embodiment of the present invention, this embodiment is described by taking a prototype system of a single-phase inverter as an example. Such as figure 1 As shown, a single-phase inverter includes an input AC voltage source 1, an output filter inductor 2 of the inverter, an H-bridge circuit 3, and a DC side power supply 4; an input AC voltage source 1 and an output filter inductor of the inverter 2 are connected in series to the AC side of the H-bridge circuit 3, and the DC side of the H-bridge circuit 3 is connected...

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Abstract

The invention provides an inverter control method without a power grid voltage sensor. The inverter control method comprises two parts, namely analog negative resistance control and stabilization control based on analog negative inductance. The analog negative resistance control is used for transmitting the power of an inverter to a power grid and ensuring that the output current of the inverter is kept sine. The stabilization control based on analog negative inductance is used for making up for unstable poles caused by the analog negative resistance control so as to realize safe and stable operation of the inverter. In addition, according to the method, only the output current of the inverter is sampled, so the reliability of a system is improved, and sensor cost is reduced. Meanwhile, the method is easy to control, has small calculation amount and is suitable for practical application.

Description

technical field [0001] The present invention relates to the technical field of power electronic control, and more specifically, relates to a control method of a novel non-grid voltage sensor of an inverter. Background technique [0002] With the rapid development of power semiconductor devices and microcontroller technology, the use of power electronic devices to achieve efficient use of electric energy has become a frontier direction and research focus in the field of electrotechnical technology. With the development of national economy, science and technology, the demand for electric energy is increasing day by day. As one of the key power converters in the photovoltaic power generation industry, the inverter is very important to study its high-performance and high-reliability control. [0003] Usually, under the conditions of sampling grid voltage and grid current, many controllers can realize high power quality operation of the inverter. Voltage sensors and current sen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M1/088
CPCH02M7/53871H02M1/088
Inventor 孙尧佩德罗谢诗铭林建亨粟梅王辉熊文静刘新
Owner CENT SOUTH UNIV
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