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Virtual DC motor control method applied to bidirectional dc/dc converter

A control method and DC motor technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve problems such as high hardware requirements, no consideration of dynamic effects, and complex control strategies

Active Publication Date: 2021-09-10
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the control strategies of the above methods are relatively complex and require high hardware requirements, and the virtual machine model is a steady-state model, that is, the armature winding of the simulated motor is equivalent to a resistance, and the dynamic influence in the actual operation process is not considered.

Method used

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  • Virtual DC motor control method applied to bidirectional dc/dc converter
  • Virtual DC motor control method applied to bidirectional dc/dc converter
  • Virtual DC motor control method applied to bidirectional dc/dc converter

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Embodiment Construction

[0050] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] The present invention is applied to a virtual DC motor control system of a bidirectional DC / DC converter, such as figure 1 As shown, it includes two parts of bidirectional DC / DC converter topology circuit and its control circuit. Among them, v b is the battery terminal voltage, L b is the inductance in the converter, r b is the resistance, i b and i dc are battery output current and converter output current respectively, C dc is the DC side capacitance, u dc is the DC bus voltage. The specific structure of the topological circuit is as follows: the left side is connected to the battery, and the current direction is switched by two switching tubes in the middle through the same bridge arm (ie, S 1 Open S 2 When shutting down, the energy flows from the battery to the DC side; S 2 Open S 1When it is turned off, the energy flows...

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Abstract

The invention discloses a virtual DC motor control method applied to a bidirectional DC / DC converter, specifically: in order to study the dynamic characteristics of the DC bus voltage, compared with the DC motor speed regulation process, the DC / DC converter resistance inductance is designed Characteristic droop coefficient; In order to introduce inertial and damping characteristics in DC microgrid, a virtual machine control model of bidirectional DC / DC converter is established. The method of the invention improves the traditional P-U droop control, and aims to study the dynamic characteristics of the DC bus voltage and introduce damping and inertia characteristics into the system to maintain the stability of the DC bus voltage. It has been verified by simulation that the control strategy used in the present invention is at the moment of load power fluctuation or light intensity change u dc The magnitude of change is smaller, and it can also quickly reach a new steady state.

Description

technical field [0001] The invention belongs to the technical field of converter current control, and in particular relates to a virtual DC motor control method applied to a bidirectional DC / DC converter. Background technique [0002] DC microgrid is an important part of the future intelligent power distribution system, which is of great significance to promote energy conservation, emission reduction and sustainable development, and it is easy to connect with DC power generation equipment such as photovoltaics and energy storage and DC loads, reducing inverter links , reduce system cost and loss, and have higher power supply efficiency. In addition, compared with the AC power grid, the DC micro-grid does not have problems such as frequency stability and reactive power, and it is easy to realize coordinated control among micro-power sources. [0003] In the DC microgrid, various distributed energy sources, energy storage equipment and various AC and DC loads are connected to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155H02M1/088
CPCH02M1/088H02M3/155H02M1/0038
Inventor 支娜明旭安业伟张林杰周红芳
Owner XIAN UNIV OF TECH
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