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Design method of light-weight direct-current power transmission system controller based on active disturbance rejection control

A light direct current transmission and system controller technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as oscillation, closed-loop system slowness, and large initial errors, and achieve high control accuracy, easy parameters, and algorithms simple effect

Inactive Publication Date: 2016-03-16
ANHUI HUADIAN ENG CONSULTATING & DESIGN
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AI Technical Summary

Problems solved by technology

If the sudden change of y is required, the initial error will be large, and it is easy to cause overshoot, which is very unreasonable
(2) It is difficult to extract the differential signal of the error: in practice, the extraction of the differential signal can only be realized approximately, but cannot be realized precisely
(3) The introduction of integral feedback has many side effects; in PID control, the introduction of error integral feedback is to eliminate the net difference and improve the accuracy of system response; at the same time, it will also make the closed-loop system dull, produce oscillation, and generate Saturation causes control volume saturation
(4) The linear combination is not the best combination; the input of the PID controller is the linear combination of the present, the past and the future of the error, and the linear combination is easy to cause the contradiction between rapidity and overshoot, so it is not the best combination of

Method used

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  • Design method of light-weight direct-current power transmission system controller based on active disturbance rejection control
  • Design method of light-weight direct-current power transmission system controller based on active disturbance rejection control
  • Design method of light-weight direct-current power transmission system controller based on active disturbance rejection control

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Embodiment Construction

[0016] figure 1 The schematic diagram of the double-ended light DC transmission system is shown, and the voltage source converters with the same structure are used in the converter stations at both ends. The mathematical model is as follows:

[0017] The active power and reactive power absorbed by the converter are as follows (take VSC1 as an example):

[0018] (1)

[0019] In the formula, U 1S , U 1C ,δ 1 are the AC bus voltage, the fundamental component of the AC voltage of the converter and the phase angle difference between them; X 1 is the equivalent reactance of the converter transformer. by controlling U 1C and δ 1 The magnitude and flow direction of active power and reactive power absorbed by the converter can be controlled.

[0020] Assuming that the three-phase voltage of the power grid is balanced, according to figure 1 In the reference direction shown, the three-phase system shown in formula (1) is carried out dq Transformation, where the AC bus vol...

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Abstract

The invention discloses a design method of a light-weight direct-current power transmission system controller based on active disturbance rejection control. The method comprises the following steps that: a transient mathematics model is established under a synchronous rotating reference frame in conjunction with a working principle of a light-weight direct-current power transmission system; a direct-current voltage controller based on an active disturbance rejection control technology can control a voltage stabilizer on a direct-current side of a current transducer and reactive power balance on an alternating-current side, adopts double-ring control of an inner ring and an outer ring, stabilizes a voltage of a direct-current system, and keeps unit power factor running of an alternating-current system; and power controllers based on the active disturbance rejection control technology consist of outer ring power control and inner ring current control, and can realize unit power factor running of the alternating-current system and ensure running of a system load flow according to a scheduling set value. The design method is a novel control method provided in ways of learning from the advantages of proportion integration differentiation (PID) control, referring to variable-structure control and avoiding the phenomenon of chattering in the variable-structure control. The design method has the advantages of simple algorithm, high control accuracy, high stability, easiness in parameter debugging, low dependence on a system mathematics model, and the like.

Description

Technical field: [0001] The invention relates to the technical field of power transmission system controllers, in particular to a design method for a light direct current transmission system controller based on active disturbance rejection control technology. Background technique: [0002] In the DC transmission system, according to the different types of converter devices, it can be divided into current source converters and voltage source converters. Currently, most of the existing DC transmission projects use current source converters. With the development of power electronics technology, the technology of voltage source-based converters emerges as the times require, and has become one of the hotspots in the research of light direct current transmission. [0003] The converter stations at both ends of the light direct current transmission system are connected by a direct current transmission line, and the two converters operate in the rectification state and the inverter ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCY02E60/60H02J3/36H02J2003/365
Inventor 范斌王付军
Owner ANHUI HUADIAN ENG CONSULTATING & DESIGN
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