CN113675874B - Self-adaptive hysteresis control method applied to flexible direct-current comprehensive voltage regulating device - Google Patents

Self-adaptive hysteresis control method applied to flexible direct-current comprehensive voltage regulating device Download PDF

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CN113675874B
CN113675874B CN202111033190.3A CN202111033190A CN113675874B CN 113675874 B CN113675874 B CN 113675874B CN 202111033190 A CN202111033190 A CN 202111033190A CN 113675874 B CN113675874 B CN 113675874B
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inverter
level
output current
current
hysteresis
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CN113675874A (en
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范建华
曹乾磊
宁振
李保安
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Qingdao Topscomm Communication Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The invention discloses a self-adaptive hysteresis control method applied to a flexible direct-current comprehensive voltage regulating device, which comprises the following steps: in the three-level hysteresis control process: when the net side reference voltage reaches a set threshold value, the hysteresis mode is adjusted to be a small pulse acceleration control mode, namely, the inverter output state is switched to a negative level after the zero level state duration reaches the threshold value, so that the rising speed of the inverter output current is improved; when the grid-side reference voltage is negative, and the grid-side reference voltage reaches a set threshold value, the hysteresis mode is adjusted to be a small pulse acceleration control mode, namely, the inverter output state is switched to the positive level after the zero level state duration reaches the threshold value, so that the falling speed of the inverter output current is improved. The invention improves the current distortion problem of the traditional three-level inversion technology near the voltage zero crossing point, improves the current tracking capability, realizes the reliable compensation effect of the low-voltage compensation device, has small calculated amount, is easy to realize and has strong engineering practicability.

Description

Self-adaptive hysteresis control method applied to flexible direct-current comprehensive voltage regulating device
Technical Field
The invention relates to the technical field of distribution network power quality control, in particular to a self-adaptive hysteresis control method applied to a flexible direct current comprehensive voltage regulating device.
Background
With the reduction of urban and rural gaps, the requirements of rural areas or urban suburbs on power supply quality are higher and higher, and particularly, the problem of low voltage becomes a complaint hot spot of a power grid, so that a low voltage management device based on a power electronic converter receives great attention, and not only can compensate the user voltage of a low voltage transformer area to a normal level, but also can manage the problems of harmonic waves, reactive power and the like. The integrated voltage regulation capability depends on the device being able to quickly and stably emit the required compensation current, so that a better current control technology is needed.
The hysteresis control is a current tracking control technology, is commonly used in the field of control of power electronic converters, has the advantages of simple control method, high response speed and good stability, can realize quick tracking control of current, and has better robustness. For a common three-level inverter, the traditional three-level hysteresis control method generally determines the output level of an inverter bridge according to the positive and negative of a reference voltage at the power grid side, when the reference voltage is positive, the output level state of the inverter bridge is positive or zero, and when the reference voltage is negative, the output level state of the inverter bridge is negative or zero. However, in practical application, the hysteresis method is affected by lower switching frequency and minimum loop width value near the zero crossing point of the network side voltage, and the compensation current is easy to generate distortion phenomenon.
Disclosure of Invention
Aiming at the defects and drawbacks existing in the prior art, the invention provides a self-adaptive hysteresis control method applied to a flexible direct current comprehensive voltage regulating device, which improves the problem of current distortion of hysteresis control near a voltage zero crossing point, thereby realizing stable tracking control of the output current of a three-level inverter.
The aim of the invention can be achieved by the following technical scheme:
an adaptive hysteresis control method applied to a flexible direct current comprehensive voltage regulating device, the method comprises the following steps:
s1: judging the positive and negative of the network side reference voltage;
s2: when the reference voltage at the network side is positive, if the output current of the inverter in the flexible direct-current comprehensive voltage regulating device is larger than the upper boundary of the hysteresis loop width, the inverter outputs positive level, so that the output current of the inverter is reduced; if the inverter output current is smaller than the lower boundary of the loop width, the inverter outputs zero level, so that the inverter output current is increased; when the network side reference voltage reaches a set threshold range, the hysteresis mode is adjusted to be a small pulse acceleration control mode, namely, after the zero level state lasts for a set time, the output state of the inverter is switched to a negative level, and the rising speed of the output current of the inverter is improved;
s3: when the reference voltage at the network side is negative, if the output current of the inverter in the flexible direct current comprehensive voltage regulating device is larger than the upper boundary of the hysteresis loop width, the inverter outputs zero level, so that the output current of the inverter is reduced; if the inverter output current is smaller than the lower boundary of the loop width, the inverter outputs a negative level, so that the inverter output current is increased; when the network side reference voltage reaches a set threshold range, the hysteresis mode is adjusted to be a small pulse acceleration control mode, namely, after the zero level state lasts for a set period of time, the output state of the inverter is switched to the positive level, and the falling speed of the output current of the inverter is improved.
Further, the duration of the zero level state set in the steps S2 and S3 is less than 2/3 of the preset switching period.
The beneficial technical effects of the invention are as follows: the problem of current distortion of the traditional three-level inversion technology near a voltage zero crossing point is solved, the current tracking capability is improved, the reliable compensation effect of the low-voltage compensation device is realized, the calculated amount of the method is small, the method is easy to realize, and the engineering practicability is very high.
Drawings
Fig. 1 is a schematic structural diagram and an electrical connection diagram of a flexible dc voltage regulator in an embodiment of the present invention.
Fig. 2 and fig. 3 are schematic diagrams of small pulse acceleration in the adaptive hysteresis control method according to the embodiment of the present invention.
Fig. 4 is a general flow chart of the present invention.
Reference numerals: 1 is a transformer substation, 2 and 3 are line impedances, 4 and 5 are bypass loads, and 6 is a terminal low-voltage load; 7 is a three-level rectifier, 71 and 72 are filter inductors, 73 is a filter capacitor, 74 is an upper bus capacitor, and 75 is a lower bus capacitor; 8 is a three-level inverter, 81 and 82 are filter inductors, 83 is a filter capacitor, 84 is an upper bus capacitor, and 85 is a lower bus capacitor.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Examples
As shown in fig. 1 and 4, the adaptive hysteresis control method applied to the flexible direct current comprehensive voltage regulating device comprises the following steps:
s1: judging the positive and negative of the network side reference voltage;
the following refers to fig. 2 and 3.
S2: when the network side reference voltage U grid_ref If the output current i of the inverter in the flexible direct current integrated voltage regulating device is positive inv Is larger than the upper boundary i of the hysteresis loop width refH The inverter outputs a positive level U dc+ To make the inverter output electricity i inv The flow is reduced; if the inverter outputs current i inv Less than the lower boundary i of the annular width refL The inverter outputs zero level U dc0 To make the inverter output current i inv Increasing; when the network side reference voltage U grid_ref When reaching the set threshold range, the hysteresis mode is adjusted to a small pulse acceleration control mode, namely, the hysteresis mode is in a zero level state for a set time T 0+ After that, the inverter output state is switched to the negative level U dc- At this time, the current change speed of the inverter inductance l is changed from
Figure BDA0003245967290000021
Increase to->
Figure BDA0003245967290000022
(wherein U grid U is the voltage at the connection of the equipment and the power grid dcNeg The voltage value of the lower bus capacitor at the inversion side), the output current of the acceleration inverter rises to the upper boundary of the loop width, and the small pulse acceleration time is t2-t1.
S3: when the network side reference voltage U grid_ref If negative, if the inverter output current i in the flexible DC voltage regulator inv Is larger than the upper boundary i of the hysteresis loop width refH The inverter outputs zero level U dc0 To make the inverter output current i inv A reduction; if the inverter outputs current i inv Less than the lower boundary i of the annular width refL The inverter outputs a negative level U dc- To make the inverter output current i inv Increasing; when the network side reference voltage U grid_ref When reaching the set threshold range, the hysteresis mode is adjusted to a small pulse acceleration control mode, namely, the hysteresis mode is in a zero level state for a set time T 0- After that, the inverter output state is switched to the positive level U dc+ At this time, the current change speed of the inverter inductance L is changed from
Figure BDA0003245967290000023
Increase to->
Figure BDA0003245967290000024
(wherein U grid U is the voltage at the connection of the equipment and the power grid dcPos The voltage value of the bus capacitor on the inversion side), the output current of the acceleration inverter is reduced to the lower boundary of the loop width, and the small pulse acceleration time is t2-t1.
The threshold voltage ranges in S2 and S3 are set to be [ -50V, +50V ], and when the network side reference voltage enters the range, the hysteresis control mode is switched to the small pulse acceleration mode.
Setting zero level duration T 0+ ＝T 0- And ensure that the switching period T is smaller than a preset switching period T PWM 2/3 of (C).
T 0+ ＝T 0- ＝t1-t0
According to the reference value i of the output current of the inverter inv_ref Selecting proper ring width value H, calculating to obtain upper boundary value i of hysteresis ring width refH And lower boundary value i refL The method comprises the following steps:
i refH ＝i inv_ref +H/2
i refL ＝i inv_ref -H/2
the above embodiments are illustrative of the specific embodiments of the present invention, and not restrictive, and various changes and modifications may be made by those skilled in the relevant art without departing from the spirit and scope of the invention, so that all such equivalent embodiments are intended to be within the scope of the invention.

Claims (2)

1. The self-adaptive hysteresis control method applied to the flexible direct-current comprehensive voltage regulating device is characterized by comprising the following steps of:
s1: judging the positive and negative of the network side reference voltage;
s2: when the reference voltage at the network side is positive, if the output current of the inverter in the flexible direct-current comprehensive voltage regulating device is larger than the upper boundary of the hysteresis loop width, the inverter outputs positive level, so that the output current of the inverter is reduced; if the inverter output current is smaller than the lower boundary of the loop width, the inverter outputs zero level, so that the inverter output current is increased; when the network side reference voltage reaches a set threshold range, the hysteresis mode is adjusted to be a small pulse acceleration control mode, namely, after the zero level state lasts for a set time, the output state of the inverter is switched to a negative level, and the rising speed of the output current of the inverter is improved;
s3: when the reference voltage at the network side is negative, if the output current of the inverter in the flexible direct current comprehensive voltage regulating device is larger than the upper boundary of the hysteresis loop width, the inverter outputs zero level, so that the output current of the inverter is reduced; if the inverter output current is smaller than the lower boundary of the loop width, the inverter outputs a negative level, so that the inverter output current is increased; when the network side reference voltage reaches a set threshold range, the hysteresis mode is adjusted to be a small pulse acceleration control mode, namely, after the zero level state lasts for a set period of time, the output state of the inverter is switched to the positive level, and the falling speed of the output current of the inverter is improved.
2. The adaptive hysteresis control method for a flexible dc voltage regulator according to claim 1, wherein the zero-level state duration set in steps S2 and S3 is less than 2/3 of a preset switching period.
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JP2019058019A (en) * 2017-09-22 2019-04-11 三菱電機株式会社 Electric power converter
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FR1393853A (en) * 1963-05-08 1965-03-26 Philips Nv Device for receiving pulse signals
CN103636106A (en) * 2011-02-10 2014-03-12 保尔王有限公司 Input current shaping for transition and discontinuous mode power converter
CN103151780A (en) * 2013-03-04 2013-06-12 东南大学 Method for fixed-time ring-width-variable current control of three-phase three-wire system SAPF (Shunt Active Power Filter)
CN105958527A (en) * 2016-05-03 2016-09-21 长沙理工大学 Photovoltaic grid connected inverter multiparameter hysteresis current composite control method
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