CN112350338A - Reactive and harmonic self-adaptive compensation method and device - Google Patents
Reactive and harmonic self-adaptive compensation method and device Download PDFInfo
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- CN112350338A CN112350338A CN202011061376.5A CN202011061376A CN112350338A CN 112350338 A CN112350338 A CN 112350338A CN 202011061376 A CN202011061376 A CN 202011061376A CN 112350338 A CN112350338 A CN 112350338A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 230000003044 adaptive effect Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- 238000003908 quality control method 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
- H02J3/18—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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- 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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- 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
- Y02E40/30—Reactive power compensation
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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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a reactive and harmonic self-adaptive compensation method and a device, which can realize the self-adaptive distribution of reactive and harmonic compensation capacity when the capacity of the device is less than the reactive and harmonic compensation capacity required by a system, and comprises the following steps: a reactive current and harmonic current detection link: detecting reactive current and harmonic current of a load; a weighting calculation link: calculating a weighted value of compensating reactive power and harmonic current according to the severity of deviation of actually measured load reactive power current and harmonic current from system requirement indexes; a compensation current instruction generation link: and obtaining a compensation current instruction value according to the weighted values of the compensation reactive power and the harmonic current.
Description
Technical Field
The invention belongs to the technical field of power quality control of a power distribution network, and particularly relates to a reactive and harmonic self-adaptive compensation method.
Background
With the development of modern industry, nonlinear loads (such as thyristor rectifier devices, arc furnaces, household appliances and the like) in power grids are greatly increased, so that the reactive power and harmonic problems in the power grids are increasingly serious. The idle work and the harmonic wave can increase the extra additional loss of power transmission, power supply and utilization equipment and a power transmission line, reduce the utilization rate and the economic benefit of the equipment and shorten the service life of the equipment. In order to improve the quality of electric energy, increase the power factor and the electricity utilization efficiency, save energy and reduce loss, harmonic and reactive power compensation devices (such as Static Var Compensator (SVC), static var generator (STATCOM or SVG), Active Power Filter (APF)) are widely used at home and abroad. High performance APF and STATCOM devices generally have the capability of compensating reactive power and harmonic waves at the same time, but when the device capacity is smaller than the reactive power and harmonic wave capacity required by the system to compensate, the device cannot completely compensate the reactive power and harmonic wave required by the system due to the amplitude limit of the device capacity, and additional reactive power and harmonic wave can be generated.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem to be solved by the invention is to provide a reactive and harmonic self-adaptive compensation method, which can realize the self-adaptive distribution of the reactive and harmonic compensation capacity when the device capacity is smaller than the reactive and harmonic compensation capacity required by the system.
In order to solve the technical problems, the invention adopts the following technical scheme: a reactive and harmonic adaptive compensation method comprises the following steps:
a reactive current and harmonic current detection link: detecting reactive current and harmonic current of a load;
a weighting calculation link: calculating a weighted value of compensating reactive power and harmonic current according to the severity of deviation of actually measured load reactive power current and harmonic current from system requirement indexes;
a compensation current instruction generation link: and obtaining a compensation current instruction value according to the weighted values of the compensation reactive power and the harmonic current.
Preferably, in the reactive current and harmonic current detection link, the three-phase load reactive and harmonic current i is firstly detected and obtainedxqAnd ixhWherein the subscript x is a, b and c, and represents three phases of a, b and c, and then calculating to obtain ixqAnd ixhThree-phase average value of effective value is IqAnd Ih。
Preferably, in the weighted calculation link, the reactive and harmonic current indexes required by the system are respectively IqeAnd IheThe severity of deviation of the actual measured reactive power and harmonic current of the load from the required indexes of the system is SqAnd ShIs provided with
The reactive and harmonic current compensation weighted values are dqAnd dhIs provided with
Preferably, in the compensation of electricityIn the step of generating the flow instruction, firstly, the sum I of the actually measured load reactive power and harmonic current is judgedq+IhWhether the compensation limit value I of the harmonic and reactive power compensation device is exceededlim，
If Iq+Ih≤IlimThen full compensation is adopted, the compensation current command is
ix *＝ixq+ixhWherein the subscript x is a, b and c, i represents three phases of a, b and cxqAnd ixhRespectively representing the actually measured three-phase load reactive power and harmonic current;
if Iq+Ih＞IlimThen, a weighted compensation is applied, the compensation current command is
The invention also provides a reactive and harmonic self-adaptive compensation device, which comprises:
reactive current and harmonic current detection module: the device is used for detecting reactive current and harmonic current of a load;
a weighting calculation module: calculating a weighted value of compensating reactive power and harmonic current according to the severity of deviation of actually measured load reactive power current and harmonic current from system requirement indexes;
a compensation current command generation module: and obtaining a compensation current instruction value according to the weighted values of the compensation reactive power and the harmonic current.
According to the technical scheme, in a compensation current instruction generation link, whether the sum of actually measured load reactive power and harmonic current exceeds the compensation limit value of a harmonic and reactive power compensation device or not is judged, if not, full compensation is adopted, if so, weighted compensation is adopted, and when the capacity of the device is smaller than the reactive and harmonic compensation capacity required by a system, adaptive distribution of the reactive and harmonic compensation capacity can be realized through the weighted compensation.
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
fig. 1 shows a reactive and harmonic adaptive compensation method according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, a reactive and harmonic adaptive compensation method includes the following steps:
a reactive current and harmonic current detection link: detecting reactive current and harmonic current of a load;
a weighting calculation link: calculating a weighted value of compensating reactive power and harmonic current according to the severity of deviation of actually measured load reactive power current and harmonic current from system requirement indexes;
a compensation current instruction generation link: and obtaining a compensation current instruction value according to the weighted values of the compensation reactive power and the harmonic current.
In the reactive current and harmonic current detection link, firstly, three-phase load reactive and harmonic current i is obtained through detectionxqAnd ixhWherein the subscript x is a, b and c, and represents three phases of a, b and c, and then calculating to obtain ixqAnd ixhThree-phase average value of effective value is IqAnd Ih。
In the weighted calculation link, the reactive and harmonic current indexes required by the system are respectively IqeAnd IheThen the load actually measures the reactive and harmonic currentThe severity of deviation from the system requirement index is SqAnd ShIs provided with
The reactive and harmonic current compensation weighted values are dqAnd dhIs provided with
In the step of generating a compensation current instruction, firstly, the sum I of the actually measured load reactive power and harmonic current is judgedq+IhWhether the compensation limit value I of the harmonic and reactive power compensation device is exceededlim，
If Iq+Ih≤IlimThen full compensation is adopted, the compensation current command is
ix *＝ixq+ixhWherein the subscript x is a, b and c, i represents three phases of a, b and cxqAnd ixhRespectively representing the actually measured three-phase load reactive power and harmonic current;
if Iq+Ih＞IlimThen, a weighted compensation is applied, the compensation current command is
Example two
A reactive and harmonic adaptive compensation apparatus, comprising:
reactive current and harmonic current detection module: the device is used for detecting reactive current and harmonic current of a load;
a weighting calculation module: calculating a weighted value of compensating reactive power and harmonic current according to the severity of deviation of actually measured load reactive power current and harmonic current from system requirement indexes;
a compensation current command generation module: and obtaining a compensation current instruction value according to the weighted values of the compensation reactive power and the harmonic current.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (5)
1. A reactive and harmonic adaptive compensation method is characterized by comprising the following steps:
a reactive current and harmonic current detection link: detecting reactive current and harmonic current of a load;
a weighting calculation link: calculating a weighted value of compensating reactive power and harmonic current according to the severity of deviation of actually measured load reactive power current and harmonic current from system requirement indexes;
a compensation current instruction generation link: and obtaining a compensation current instruction value according to the weighted values of the compensation reactive power and the harmonic current.
2. The reactive and harmonic adaptive compensation method of claim 1, wherein: in the reactive current and harmonic current detection link, firstly, three-phase load reactive and harmonic current i is obtained through detectionxqAnd ixhWherein the subscript x is a, b and c, and represents three phases of a, b and c, and then calculating to obtain ixqAnd ixhThree-phase average value of effective value is IqAnd Ih。
3. A reactive and harmonic adaptive compensation method according to claim 2, characterized in that: in the weighted calculation link, the reactive and harmonic current indexes required by the system are respectively IqeAnd IheThe severity of deviation of the actual measured reactive power and harmonic current of the load from the required indexes of the system is SqAnd ShIs provided with
The reactive and harmonic current compensation weighted values are dqAnd dhIs provided with
4. A reactive and harmonic adaptive compensation method according to claim 3, characterized in that: in the step of generating a compensation current instruction, firstly, the sum I of the actually measured load reactive power and harmonic current is judgedq+IhWhether the compensation limit value I of the harmonic and reactive power compensation device is exceededlim，
If Iq+Ih≤IlimThen full compensation is adopted, the compensation current command is
ix *＝ixq+ixhWherein the subscript x is a, b and c, i represents three phases of a, b and cxqAnd ixhRespectively representing the actually measured three-phase load reactive power and harmonic current;
if Iq+Ih＞IlimThen, a weighted compensation is applied, the compensation current command is
5. A reactive and harmonic adaptive compensation apparatus, comprising:
reactive current and harmonic current detection module: the device is used for detecting reactive current and harmonic current of a load;
a weighting calculation module: calculating a weighted value of compensating reactive power and harmonic current according to the severity of deviation of actually measured load reactive power current and harmonic current from system requirement indexes;
a compensation current command generation module: and obtaining a compensation current instruction value according to the weighted values of the compensation reactive power and the harmonic current.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140146583A1 (en) * | 2010-08-24 | 2014-05-29 | Alstom Technology Ltd | Hvdc converter with neutral-point connected zero-sequence dump resistor |
| CN107332245A (en) * | 2017-08-29 | 2017-11-07 | 云南电力试验研究院(集团)有限公司 | A kind of harmonic wave and idle administering method |
| CN109617087A (en) * | 2018-11-27 | 2019-04-12 | 中电普瑞科技有限公司 | The idle and harmonic wave self-adapting compensation method of one kind and system |
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- 2020-09-30 CN CN202011061376.5A patent/CN112350338A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140146583A1 (en) * | 2010-08-24 | 2014-05-29 | Alstom Technology Ltd | Hvdc converter with neutral-point connected zero-sequence dump resistor |
| CN107332245A (en) * | 2017-08-29 | 2017-11-07 | 云南电力试验研究院(集团)有限公司 | A kind of harmonic wave and idle administering method |
| CN109617087A (en) * | 2018-11-27 | 2019-04-12 | 中电普瑞科技有限公司 | The idle and harmonic wave self-adapting compensation method of one kind and system |
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