CN103683874A - Double-feed current transformer control method based on repeated control - Google Patents
Double-feed current transformer control method based on repeated control Download PDFInfo
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Abstract
The invention provides a double-feed current transformer control method based on repeated control. The method involves extracting and negating harmonic waves so as to serve as an input amount of the repeated control. A repeated controller takes the input amount as output of a next period as voltage feedforward so as to realize advanced prediction of the next period and avoid stable-state errors caused by phase lag of the controller and a high-pass filter itself.
Description
Technical field
The invention belongs to control strategy, particularly relate to a kind of control method of the double-feed current transformer based on repeating to control.
Background technology
In the prior art, the net side inverter of double-feed current transformer is that the switch harmonic of filtering itself makes it can not be incorporated into electrical network, but motor itself also can produce harmonic wave, these harmonic waves can cause device local pyrexia, also can have influence on the voltage detecting of current transformer to electrical network, so the harmonic wave that net side inverter also needs filtering motor to produce in the switch harmonic of filtering own simultaneously.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of control method of the double-feed current transformer based on repeating to control, and the harmonic wave that motor is produced carries out filtering, purifies power grid environment.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of control method of the double-feed current transformer based on repeating to control, and comprise harmonic wave detecting unit and repeat control unit,
Described harmonic wave detecting unit comprises the steps:
(1), by threephase load current signal iLa, iLb after gathering from electrical network and iLc from a-b-c coordinate transform to the d-q-0 coordinate system with a-b-c coordinate synchronous rotary angle, obtain component iLd, iLq and iL0, after this conversion, iLd and iLq be first-harmonic real component and the fundamental reactive component of corresponding load current respectively, the zero-sequence component of the corresponding load current of iL0;
, make iLd component and iLq component through low pass filter, obtain the DC component of iLd component and iLq component respectively, with iLd component, deduct the DC component of iLd, the DC component that iLq component deducts iLq, gained difference is the harmonic component in load current;
(3), by harmonic component from d-q-0 coordinate transform to the a-b-c coordinate system with d-q-0 coordinate synchronous rotary angle;
(4), will after three harmonic component negates that transform in a-b-c coordinate system, as dextrorotation reference signal, input to described repetition control unit;
Described repetition control unit comprises the steps:
(1), the output value of feedback of dextrorotation reference signal and described repetition control unit is compared and obtains a difference signal;
(2), by described difference signal input time delay link;
, by the output signal input offset device after time delay, compensator compensates difference according to the difference signal that receives;
(4) the signal, after compensation is controlled whole electrical network as the output signal that repeats control unit, and the harmonic signal in electrical network is offset, and has so far formed a controlled circulation cycle.
Further, described time delay process comprises low pass filter and delayer.
Further, the step in described repetition control unit (2) described in difference signal in time delay process by time delay one-period.
Advantage and good effect that the present invention has are: owing to adopting technique scheme, can reduce the switching frequency of net side inverter, reduce the capacity of net side IGBT.The harmonic content of electrical network is controlled in very little scope, has staticized power grid environment.This scheme has the outstanding advantages such as circuit topological structure is simple, energy consumption is little.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention;
Fig. 2 implements course of work intention in illustration.
Embodiment
As shown in Figure 1 and Figure 2, the invention provides a kind of control method of the double-feed current transformer based on repeating to control, comprise harmonic wave detecting unit and repeat control unit,
Harmonic wave detecting unit comprises the steps:
(1), by threephase load current signal iLa, iLb after gathering and iLc from a-b-c coordinate transform to the d-q-0 coordinate system with a-b-c coordinate synchronous rotary angle ω, obtain component iLd, iLq and iL0, after this conversion, iLd and iLq be first-harmonic real component and the fundamental reactive component of corresponding load current respectively, the zero-sequence component of the corresponding load current of iL0;
(2), make iLd component and iLq component through low pass filter LPF, obtain respectively the DC component of iLd component and iLq component, with iLd component, deduct the DC component of iLd, the DC component that iLq component deducts iLq, gained difference is the harmonic component in load current;
(3), by harmonic component from d-q-0 coordinate transform to the a-b-c coordinate system with d-q-0 coordinate synchronous rotary angle;
(4), by three harmonic component i* that transform in a-b-c coordinate system
ha, i*
hb, i*
hcafter negate, as dextrorotation reference signal, input to described repetition control unit;
Repetition control unit comprises the steps:
(1), dextrorotation reference signal r is compared and obtains a difference signal e with the output value of feedback y that repeats control unit;
(2), by difference signal e input time delay link;
, by the output signal input offset device C (Z) after time delay, compensator C (Z) compensates difference according to the difference signal e that receives;
(4) the signal, after compensation is controlled whole electrical network as the output signal that repeats control unit, and the harmonic signal in electrical network is offset, and has so far formed a controlled circulation cycle.
Further, described time delay process comprises low pass filter and delayer.
Further, the step in described repetition control unit (2) described in difference signal in time delay process by time delay one-period.
Repeat control unit and come from the internal model principle in control theory, internal model principle is that a kinetic model implant controller of the external signal that acts on system is to form a kind of design principle of high accuracy feedback control system.This principle is pointed out: if the ability (and stable state time error goes to zero) that requires a feedback control system to have good trace command and offset disturbing influence, and this adjustment process to error is constitutionally stable, in feedback control loop inside, must comprise a Mathematical Modeling of describing external input signal dynamics.The Mathematical Modeling of this external signal is exactly so-called " internal mold ".In figure, r is sinusoidal reference signal, and y is inverter output voltage, and e is error signal, and d is equivalent periodic disturbance, Z
-Nfor cycle delay link, N is the sampling number of a primitive period, and C (Z) is for repeating the compensator of control loop.Q (Z) is a filter construction, it and Z
nform together the internal mold part of repetitive controller, conventionally Q (Z) is the constant that a low pass filter or are less than 1, do like this in order to make " pure integration " structure in Fig. 2 the form of into " quasi-integral ", avoid being positioned at N open loop pole on unit circle circumference because of what " pure integration " brought, make open cycle system can not present threshold oscillation state.The cycle delay link Z being connected in series on forward path
-Nmake control action postpone one-period and carry out, the control information that detects just starts to affect controlled quentity controlled variable in next cycle this cycle.Because presumptive instruction and disturbance is all repeated, thus do like this control action that makes next cycle of system is had necessarily advanced.On having known after the control information in a cycle, to how this provides suitable controlled quentity controlled variable, task that compensator C (Z) will solve that Here it is next cycle.In order effectively error counteracting to be fallen rapidly, the specified controlled quentity controlled variable of given user must be that phase place is correct, amplitude is appropriate, and Neither of the two can be dispensed.
Above one embodiment of the present of invention are had been described in detail, but described content is only preferred embodiment of the present invention, can not be considered to for limiting practical range of the present invention.All equalization variations of doing according to the present patent application scope and improvement etc., within all should still belonging to patent covering scope of the present invention.
Claims (3)
1. a control method for the double-feed current transformer based on repeating to control, is characterized in that: comprises harmonic wave detecting unit and repeats control unit,
Described harmonic wave detecting unit comprises the steps:
(1), by threephase load current signal iLa, iLb after gathering from electrical network and iLc from a-b-c coordinate transform to the d-q-0 coordinate system with a-b-c coordinate synchronous rotary angle, obtain component iLd, iLq and iL0, after this conversion, iLd and iLq be first-harmonic real component and the fundamental reactive component of corresponding load current respectively, the zero-sequence component of the corresponding load current of iL0;
, make iLd component and iLq component through low pass filter, obtain the DC component of iLd component and iLq component respectively, with iLd component, deduct the DC component of iLd, the DC component that iLq component deducts iLq, gained difference is the harmonic component in load current;
(3), by harmonic component from d-q-0 coordinate transform to the a-b-c coordinate system with d-q-0 coordinate synchronous rotary angle;
(4), will after three harmonic component negates that transform in a-b-c coordinate system, as dextrorotation reference signal, input to described repetition control unit;
Described repetition control unit comprises the steps:
(1), the output value of feedback of dextrorotation reference signal and described repetition control unit is compared and obtains a difference signal;
(2), by described difference signal input time delay link;
, by the output signal input offset device after time delay, compensator compensates difference according to the difference signal that receives;
(4) the signal, after compensation is controlled whole electrical network as the output signal that repeats control unit, and the harmonic signal in electrical network is offset, and has so far formed a controlled circulation cycle.
2. according to the control method of claim 1, it is characterized in that: described time delay process comprises low pass filter and delayer.
3. according to the control method of claim 1 or 2, it is characterized in that: the step in described repetition control unit (2) described in difference signal in time delay process by time delay one-period.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503244A (en) * | 2014-12-29 | 2015-04-08 | 中国科学技术大学 | Nonrepetitiveness disturbance observer based precision positioning selective ILC (iteration learning control) system and method |
| CN108333951A (en) * | 2018-03-22 | 2018-07-27 | 宝鸡文理学院 | A kind of modular multilevel converter valve operating test loop control scheme |
| CN109599867A (en) * | 2018-11-07 | 2019-04-09 | 天津大学 | Three-phase grid-connected converter electric current loop AF panel control method based on twin nuclei |
| CN113964837A (en) * | 2021-10-09 | 2022-01-21 | 国电南瑞科技股份有限公司 | Composite control method and system suitable for LCL type parallel active power filter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101394089A (en) * | 2008-07-23 | 2009-03-25 | 国网武汉高压研究院 | Control method for three phase active electric power filter to output current wave |
| CN101950983A (en) * | 2010-10-08 | 2011-01-19 | 天津理工大学 | Two-stage photovoltaic grid-connected control system based on combination of pole allocation and repetitive control |
| CN102214921A (en) * | 2011-06-14 | 2011-10-12 | 南京冠亚电源设备有限公司 | Current waveform control method based on repetitive control strategy |
| CN102882211A (en) * | 2012-10-15 | 2013-01-16 | 北京京仪椿树整流器有限责任公司 | Self-adaptive repetitive control method for active power filter |
| CN103001250A (en) * | 2012-11-20 | 2013-03-27 | 深圳市金宏威技术股份有限公司 | Compound control method of photovoltaic grid-connected inverter |
| CN103280806A (en) * | 2013-05-21 | 2013-09-04 | 太原理工大学 | Digital delay compensation control method of active filter device |
-
2013
- 2013-11-06 CN CN201310549809.5A patent/CN103683874A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101394089A (en) * | 2008-07-23 | 2009-03-25 | 国网武汉高压研究院 | Control method for three phase active electric power filter to output current wave |
| CN101950983A (en) * | 2010-10-08 | 2011-01-19 | 天津理工大学 | Two-stage photovoltaic grid-connected control system based on combination of pole allocation and repetitive control |
| CN102214921A (en) * | 2011-06-14 | 2011-10-12 | 南京冠亚电源设备有限公司 | Current waveform control method based on repetitive control strategy |
| CN102882211A (en) * | 2012-10-15 | 2013-01-16 | 北京京仪椿树整流器有限责任公司 | Self-adaptive repetitive control method for active power filter |
| CN103001250A (en) * | 2012-11-20 | 2013-03-27 | 深圳市金宏威技术股份有限公司 | Compound control method of photovoltaic grid-connected inverter |
| CN103280806A (en) * | 2013-05-21 | 2013-09-04 | 太原理工大学 | Digital delay compensation control method of active filter device |
Non-Patent Citations (1)
| Title |
|---|
| 王映斐: "风电发电过程控制及其并网谐波补偿方法研究", 《中国优秀硕士学位论文全文数据库》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503244A (en) * | 2014-12-29 | 2015-04-08 | 中国科学技术大学 | Nonrepetitiveness disturbance observer based precision positioning selective ILC (iteration learning control) system and method |
| CN108333951A (en) * | 2018-03-22 | 2018-07-27 | 宝鸡文理学院 | A kind of modular multilevel converter valve operating test loop control scheme |
| CN109599867A (en) * | 2018-11-07 | 2019-04-09 | 天津大学 | Three-phase grid-connected converter electric current loop AF panel control method based on twin nuclei |
| CN109599867B (en) * | 2018-11-07 | 2022-04-08 | 天津大学 | Three-phase grid-connected converter current loop interference suppression control method based on double-loop structure |
| CN113964837A (en) * | 2021-10-09 | 2022-01-21 | 国电南瑞科技股份有限公司 | Composite control method and system suitable for LCL type parallel active power filter |
| CN113964837B (en) * | 2021-10-09 | 2023-12-12 | 北京南瑞数字技术有限公司 | Composite control method and system suitable for LCL type parallel active power filter |
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Application publication date: 20140326 |