CN110912132A - Harmonic compensation control method for single-phase cascade active power filter - Google Patents
Harmonic compensation control method for single-phase cascade active power filter Download PDFInfo
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- CN110912132A CN110912132A CN201911184723.0A CN201911184723A CN110912132A CN 110912132 A CN110912132 A CN 110912132A CN 201911184723 A CN201911184723 A CN 201911184723A CN 110912132 A CN110912132 A CN 110912132A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000001360 synchronised effect Effects 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 238000012935 Averaging Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
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- 238000011217 control strategy Methods 0.000 description 1
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a harmonic compensation control method of a single-phase cascade active power filter, which comprises the following steps: s1, collecting the voltage of the power grid to obtain a power grid synchronous signal; s2, collecting output voltages of the direct current sides of the cascaded H bridges, and averaging; s3, collecting load current to obtain a load current harmonic component; s4, collecting the compensation current at the alternating current side of the active power filter to obtain the harmonic component and the fundamental component of the compensation current; s5, controlling the voltage of the direct current side to be constant by adopting a PI controller in the voltage outer ring, and controlling the fundamental wave component of the current inner ring by adopting a PR controller; s6, controlling harmonic current by a P controller; and S7, superposing the output of the PR controller and the output of the P controller, adding the superposed output into the power grid voltage feedforward to obtain a modulation signal, and generating a driving signal by a carrier wave modulation method. The invention can not only stably control the voltage on the direct current side to be constant, but also quickly respond to harmonic current and improve the compensation effect of the harmonic current.
Description
Technical Field
The invention relates to a control method for power quality harmonic suppression of an active power filter, in particular to a harmonic compensation control method for a single-phase cascade active power filter.
Background
In recent years, power electronic devices have been expanded in industrial markets and application fields, and the influence of harmonics on power systems has been increasing. The active power filter is applied to various occasions as an important power electronic device for controlling the power quality, particularly in a traction power supply system of an electrified railway, and due to the nonlinear characteristic of locomotive load, a series of power quality problems are brought to a power system, particularly pollution of harmonic waves to the power system. At present, passive compensation measures are mainly adopted for harmonic compensation in the electrified railway, and the system capacity is fixed; secondly, the system adopts a mixed compensation mode of active and passive, and the control design of the system is complex. Aiming at the problems, the active power filter has obvious advantages in harmonic compensation performance compared with a passive filter, and particularly has far-reaching influence and significance in the research of the harmonic compensation technology of the cascade multilevel active power filter.
Disclosure of Invention
The present invention is directed to solve the above-mentioned problems and to provide a harmonic compensation control method for a single-phase cascaded active power filter, in which the harmonic compensation control can be controlled independently and the compensation effect is optimized.
In order to solve the technical problems, the invention adopts the following technical scheme:
a harmonic compensation control method for a single-phase cascade active power filter comprises the following steps:
s1, collecting the power grid voltage through a voltage sensor, and detecting the phase angle of the power grid voltage through a single-phase-locked loop to further obtain a unit sinusoidal synchronous signal of the power grid voltage;
s2, acquiring output voltage of the direct current side of each cascade H bridge through a voltage sensor, and obtaining an average value;
s3, collecting load current through a current sensor, and then obtaining a load current harmonic component through a harmonic detection method;
s4, collecting compensation current on the alternating current side of the active power filter through a current sensor, and then obtaining a compensation current harmonic component and a compensation current fundamental component through a harmonic detection method;
s5, the error between the average value of the output voltage at the direct current side of each cascade H bridge and the reference voltage value at the direct current side is controlled by a Proportional Integral (PI) controller to obtain the reference amplitude of the current inner loop control fundamental component, then the reference amplitude is multiplied by the unit sinusoidal synchronous signal of the grid voltage to obtain the reference signal of the current fundamental component, and then the reference signal is subtracted from the compensation current fundamental component obtained by actual detection, and the obtained error is controlled by a Proportional Resonant (PR) controller;
s6, controlling the error of the harmonic component of the load current and the harmonic component of the compensation current through a proportion (P) controller;
and S7, superposing the output of the Proportional Resonance (PR) controller and the output of the proportional resonance (P) controller, adding the superposed outputs into the power grid voltage feedforward to obtain a modulation signal, and generating a driving signal by a carrier wave modulation method.
The invention has the beneficial effects that: in the invention, fundamental current control and harmonic compensation control are independent; the parameter design of the current controller is convenient; compared with the existing control scheme, the method can stably control the voltage on the direct current side to be constant, can also quickly respond to harmonic current, and improves the harmonic compensation effect.
Drawings
Fig. 1 is a main circuit topology structure diagram of a current source grid-connected converter.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
fig. 1 is a main circuit topology structure diagram of a current source grid-connected converter, which mainly comprises a phase-locked loop, harmonic detection and double closed-loop control. The implementation comprises the following steps:
step 1: acquisition of the network voltage u by means of a voltage sensorgAnd then, obtaining a phase angle theta of the power grid voltage through a single-phase-locked loop, and further obtaining a unit sine synchronous signal sin theta of the power grid voltage.
Step 2: collecting output voltage u of DC side of each cascaded H bridge through voltage sensordcxWherein x is the number of cascaded H bridges, and then the average value u of the DC voltage can be obtaineddcAvg。
And step 3: acquisition of load current i by a current sensorLThen obtaining a load current harmonic component i by a harmonic detection methodLh。
And 4, step 4: by current flowSensor for collecting compensation current i on alternating current side of active power filtercThen obtaining a compensation current harmonic component i by a harmonic detection methodchAnd a compensation current fundamental component icf。
And 5: mean value u of DC voltage of cascaded H-bridgesdcAvgAnd a DC side reference voltage value udcRefThe error of the current is obtained by a PI controller to obtain a reference amplitude of the current inner loop control fundamental component, and then the reference amplitude of the current inner loop control fundamental component is multiplied by a grid voltage unit sine synchronous signal sin theta to obtain a reference signal i of the current fundamental componentcfRefAfter that, a reference signal i of a fundamental component of the currentcfRefAnd the actually detected compensation current fundamental component icfThe subtraction is performed and the resulting error is controlled by the PR controller.
Step 6: load current harmonic component iLhAnd compensating current harmonic component ichIs controlled by the P controller.
And 7: the output of a current fundamental component controller (namely a PR controller) and the output of a current harmonic component controller (namely a P controller) are superposed, a power grid voltage feedforward is added to obtain a modulation signal, and then a carrier modulation method is used for generating driving signals of all cascaded H-bridge switching tubes.
The invention discloses a harmonic compensation control method of a single-phase cascade active power filter, which adopts a double closed loop control strategy of a voltage outer loop and a current inner loop, and optimizes the current inner loop control in order to improve the compensation effect of harmonic current. The invention has the following advantages: compared with the existing control scheme, the method can stably control the voltage on the direct current side to be constant, can also quickly respond to harmonic current, and improves the compensation effect of the harmonic current.
In summary, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can propose other embodiments within the technical teaching of the present invention, but these embodiments are included in the scope of the present invention.
Claims (1)
1. A harmonic compensation control method for a single-phase cascade active power filter is characterized by comprising the following steps:
s1, collecting the power grid voltage through a voltage sensor, and detecting the phase angle of the power grid voltage through a single-phase-locked loop to further obtain a unit sinusoidal synchronous signal of the power grid voltage;
s2, acquiring output voltage of the direct current side of each cascade H bridge through a voltage sensor, and obtaining an average value;
s3, collecting load current through a current sensor, and then obtaining a load current harmonic component through a harmonic detection method;
s4, collecting compensation current on the alternating current side of the active power filter through a current sensor, and then obtaining a compensation current harmonic component and a compensation current fundamental component through a harmonic detection method;
s5, the error between the average value of the output voltage at the direct current side of each cascade H bridge and the reference voltage value at the direct current side is controlled by a proportional-integral controller to obtain the reference amplitude of the current inner loop control fundamental component, then the reference amplitude is multiplied by the unit sinusoidal synchronous signal of the grid voltage to obtain the reference signal of the current fundamental component, and then the reference signal is subtracted from the compensation current fundamental component obtained by actual detection, and the obtained error is controlled by a proportional resonant controller;
s6, controlling the error of the load current harmonic component and the compensation current harmonic component through a proportional controller;
and S7, superposing the output of the proportional resonant controller and the output of the proportional controller, adding the superposed output into the power grid voltage feedforward to obtain a modulation signal, and generating a driving signal by a carrier wave modulation method.
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| CN201911184723.0A CN110912132A (en) | 2019-11-27 | 2019-11-27 | Harmonic compensation control method for single-phase cascade active power filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993966A (en) * | 2021-04-02 | 2021-06-18 | 上海交通大学 | Active filtering method applied to direct current system |
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|---|---|---|---|---|
| CN101030705A (en) * | 2006-12-31 | 2007-09-05 | 湖南大学 | Method for tracking and controlling current of hybrid active filter |
| CN103151783A (en) * | 2013-04-09 | 2013-06-12 | 马伏军 | Three-phase high-voltage cascading mixing power compensator and control method thereof |
| CN103427419A (en) * | 2013-08-22 | 2013-12-04 | 宁波中睿电气有限公司 | Active power filter selective harmonic compensation control method |
| CN103441502A (en) * | 2013-09-06 | 2013-12-11 | 株洲变流技术国家工程研究中心有限公司 | Parallel single-phase H-bridge cascade type active electric power filter control device and method thereof |
| CN104934978A (en) * | 2015-06-30 | 2015-09-23 | 西安理工大学 | Two-phase cascaded active power filter |
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- 2019-11-27 CN CN201911184723.0A patent/CN110912132A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| CN101030705A (en) * | 2006-12-31 | 2007-09-05 | 湖南大学 | Method for tracking and controlling current of hybrid active filter |
| CN103151783A (en) * | 2013-04-09 | 2013-06-12 | 马伏军 | Three-phase high-voltage cascading mixing power compensator and control method thereof |
| CN103427419A (en) * | 2013-08-22 | 2013-12-04 | 宁波中睿电气有限公司 | Active power filter selective harmonic compensation control method |
| CN103441502A (en) * | 2013-09-06 | 2013-12-11 | 株洲变流技术国家工程研究中心有限公司 | Parallel single-phase H-bridge cascade type active electric power filter control device and method thereof |
| CN104934978A (en) * | 2015-06-30 | 2015-09-23 | 西安理工大学 | Two-phase cascaded active power filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993966A (en) * | 2021-04-02 | 2021-06-18 | 上海交通大学 | Active filtering method applied to direct current system |
| CN112993966B (en) * | 2021-04-02 | 2023-03-24 | 上海交通大学 | Active filtering method applied to direct current system |
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