EP3912247A1 - Filtervorrichtung für ein energienetz und verfahren zum betrieb einer filtervorrichtung - Google Patents
Filtervorrichtung für ein energienetz und verfahren zum betrieb einer filtervorrichtungInfo
- Publication number
- EP3912247A1 EP3912247A1 EP20700898.8A EP20700898A EP3912247A1 EP 3912247 A1 EP3912247 A1 EP 3912247A1 EP 20700898 A EP20700898 A EP 20700898A EP 3912247 A1 EP3912247 A1 EP 3912247A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- parameter
- filter device
- stage
- resonance frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; 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
- H02J3/1828—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepwise control, e.g. switched capacitor banks
-
- 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
-
- 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
Definitions
- the invention relates to a filter device for an energy network and a method for operating such a filter device.
- Filter devices for energy networks can be used to reduce unwanted components, such as harmonics or distortions in the mains voltage or in the mains current.
- the filter device has a resonance frequency which, for example, approximately corresponds to a tuning frequency, that is to say a frequency of vibration components to be damped. The closer the resonance and tuning frequencies are to each other, the greater the power consumption of the filter device.
- Known passive filter circuits can be difficult to regulate due to the defined resonance frequency, since the filter circuits can interact with the energy network and are generally designed for the specific network and load conditions. This applies in particular to multi-stage filter circuits to reduce harmonics with several different frequencies.
- the systems generally have a large, in particular unnecessary or even harmful, fundamental vibration reactive power due to the three-phase power capacitors used with large capacities that are required to be able to carry the maximum filter currents.
- a filter circuit can even increase the harmonics that are actually to be damped due to changes in the network surrounding the energy network or aging-related changes in the resonance frequency. This also leads to losses, accelerated aging and at worst come to irreversible damage to the filter circuit.
- the improved concept is based on the idea of determining a virtual, i.e. apparent, load parameter based on a network parameter and a filter parameter.
- the filter circuit can be detuned more, in particular by connecting a capacitive or inductive component or a resistance component.
- a filter device for an energy network includes a control unit and a filter stage with a first inductive component and a first capacitive component connected in series therewith.
- the control unit is set up to record at least one electrical network parameter of the energy network and at least one electrical filter parameter of the filter device, in particular to continuously record or monitor it, to determine at least one electrical load parameter based on the at least one network parameter and the at least one filter parameter and, depending on the at least one load parameter, to change a resonance frequency of the filter stage.
- control unit is set up to change the resonance frequency in such a way that detuning of the filter stage is thereby increased.
- the filter device also comprises a second capacitive component, the control unit being set up to connect the second capacitive component to the filter stage, in particular parallel to the first capacitive component, or to separate it from the filter stage in order to change the resonance frequency.
- the filter device comprises a second inductive component, the control unit being set up to connect the second inductive component to the filter stage or to separate it from the filter stage in order to change the resonance frequency.
- the filter stage comprises an adjustable throttle.
- the first and second inductive components are components, for example winding parts, of the adjustable choke.
- the first inductive component corresponds to a main winding of the controllable choke and the second inductive component of a control winding or part of a control winding of the controllable choke.
- controllable choke comprises a switching arrangement for the uninterrupted connection or disconnection of the control winding or part of the control winding to or from the main winding.
- the switch arrangement comprises one or more contactors, one or more circuit breakers and / or an on-load tap changer.
- the filter device also comprises a resistance component, in particular an ohmic resistance, the control unit being set up to connect the resistance component to the filter stage, in particular in series with the first inductive component, or to separate it from the filter stage in order to change the resonance frequency.
- a resistance component in particular an ohmic resistance
- the boarding or disconnection takes place second capacitive component, the second inductive component and / or the resistance component without interruption, that is to say without the filter stage being disconnected from the energy network.
- the at least one network parameter comprises an amplitude or a phase of a network voltage, in particular a portion of the network voltage which corresponds to an harmonic assigned to the filter stage.
- the at least one network parameter comprises an amplitude or a phase of a network current, in particular a portion of the network current which corresponds to a harmonic assigned to the filter stage.
- the at least one filter parameter comprises an amplitude or a phase of a filter current or a filter voltage.
- the filter current is a current that flows through a component of the filter device, for example a capacitive component, one or more of the inductive components or the resistance component.
- the filter voltage is a voltage that drops across a component of the filter device ⁇ .
- control unit is set up to determine the at least one load parameter based on an amplitude comparison and / or a phase comparison between the at least one network parameter and the at least one filter parameter.
- the at least one load parameter comprises an amplitude or a phase of an apparent load current or an apparent load voltage.
- the apparent load current and / or the apparent load voltage can be determined by the control unit from the amplitude and / or the phase comparison.
- control unit is set up to increase detuning of the filter stage by changing the resonance frequency, in particular if an amplitude of the filter current is greater than one Amplitude of the apparent load current.
- the filter stage effects an effective amplification of those harmonics that should actually be damped by it. This is at least partially compensated for by the greater detuning.
- control unit is set up to reduce detuning of the filter stage by changing the resonance frequency, in particular if a predetermined limit value for a harmonic component is exceeded.
- the filter effect is not sufficient. This is at least partially compensated for by reducing the tuning, ie tightening the tuning, and increasing the resonance frequency accordingly.
- the at least one load parameter comprises a total capacity of the filter stage.
- control unit is set up to increase a detuning of the filter stage by changing the resonance frequency if a predetermined limit value for the total capacity of the filter stage is undershot.
- the filter device comprises one or more further filter stages which are designed ⁇ analogously to the filter stage.
- each further filter stage has a further first inductive component and a further first capacitive component connected in series therewith.
- the control unit is set up to change a resonance frequency of the further filter stage as a function of the at least one load parameter, the change in the resonance frequency of the filter stage taking place simultaneously or synchronized with the change in the resonance frequency of the further filter stage.
- the filter stage and each of the further filter stages are each assigned different harmonics.
- the resonance frequencies of the filter stage and those of the other filter stages are correspondingly different.
- the energy network has at least two Phases on.
- the inductive component and the first capacitive component are connected in series between the energy network, in particular a phase of the energy network, and a star point ⁇ of the filter device.
- the inductive component and the first capacitive component are connected between two of the at least two phases of the energy network.
- a method for operating a filter device for an energy network comprises a filter stage with a first inductive component and a first capacitive component connected in series therewith.
- the filter device is designed as a filter device according to the improved concept.
- the method includes detecting at least one electrical network parameter of the energy network and at least one electrical filter parameter of the filter device, determining at least one electrical load parameter based on the at least one network parameter and the at least one filter parameter and changing a resonance frequency of the filter stage depending on the at least one a load parameter.
- Figure 1 a shows an exemplary embodiment of a filter device according to the improved concept
- FIG. 1b shows an exemplary embodiment of a filter device according to the improved concept
- 1 c shows an exemplary embodiment of a filter device according to the improved concept
- Figure 2 shows another exemplary embodiment of a filter device according to the improved concept.
- FIG. 1 a shows ⁇ an exemplary embodiment of a filter device according to the improved concept with a filter base.
- the filter feet comprise an inductive component LI, which is connected via a switch S1 1 to a first phase PI of an energy network E, which may have further phases P2, P3, for example.
- the Filfsfufe or their components are designed such that they can dampen a predetermined harmonic of the energy network E.
- the Filferfufe also ⁇ comprises a first capacitive component O l l, which is arranged in series between the inductive component LI and a remote point SP, ie a new point, the filter device.
- the filter stage comprises a second capacitive component CI 2, which can be switched in parallel with the first capacitive component CI 1 via a switch S12.
- the filter device also has a control unit S, which is coupled to the energy network E and the Filfersfufe via corresponding measuring units (not shown), for example to detect or monitor a Nefzsfrom IN and a Filfersfrom IF.
- the control unit S can detect or monitor a mains voltage UN.
- the switch S12 is open, for example, and the second capacitive component C12 is therefore separated from the filter stage.
- a resonance frequency of the filter stage is then given by the inductance of the inductive component LI and the capacitance of the first capacitive component CI 1. These are dimensioned in such a way that the filter stage is slightly out of tune compared to the harmonic to be damped, in particular is somewhat lower than the frequency of the harmonic, ie the tuning frequency. This avoids excessive power consumption of the filter stage and thus a corresponding overload of the inductive or capacitive components of the filter stage.
- the distance between the resonance frequency and the tuning frequency may change during operation. This can be caused, for example, by age-related changes in the capacitance of the first capacitive component CI 1 and / or the inductance of the inductive component LI. Another cause can be fluctuations in the energy network E. This can lead to an increased power consumption of the filter stage and ultimately to an undesirable amplification of the harmonic instead of the desired damping.
- the control unit S can continuously detect the currents IN, IF, in particular, during operation of the filter device and determine a resulting virtual or apparent load current based thereon. In particular, the control unit S evaluates the amplitudes and / or phases of the currents IN, IF, in particular those frequency components of the currents IN, IF which correspond to the harmonic to be damped.
- the control unit S can actuate the switch S12 depending on the apparent load current and thus switch the second capacitive component 012 of the filter stage. In particular, this can take place if the apparent load current exceeds a threshold value, in particular if the amplitude of the apparent load current exceeds the amplitude of the filter current IF.
- the latter indicates, for example, an amplification of the harmonic.
- control unit S can determine a capacity of the filter stage from the mains voltage UN and the filter current IF.
- the control unit S can operate the switch S12 depending on the capacity of the filter stage so switch on the second capacitive component CI 2 of the filter stage. In particular, this can take place if the capacitance falls below a threshold value. The latter indicates, for example, significant aging or damage to the capacitive component CI 1.
- the resonance frequency can also be reduced by connecting a second inductive component (see FIG. 1 c) and / or a resistor (see FIG. 1 b) to the filter stage.
- control unit S can open the switch S12 in order to separate the second capacitive component C 12 from the filter stage.
- the second capacitive component CI 2 can be separated from the filter stage if the filter effect of the filter stage is not sufficient ⁇ to achieve a sufficiently strong damping of the harmonic.
- Figure 1 b shows a further exemplary embodiment of a filter device according to the improved concept, which is based on the embodiment of Figure 1 a.
- Figure 1 c shows another exemplary embodiment of a filter device according to the improved concept, which is based on the embodiment of Figure 1 a.
- the inductance of the inductive component LI can be changed without interruption here.
- the inductive component LI is designed as an adjustable choke.
- Figure 2 shows another exemplary embodiment of a filter device according to the improved concept, which is based on the embodiment of Figure 1 a.
- the inductive component LI and the capacitive components CI 1, C12 represent a first group of the filter stage (hereinafter “first filter stage”).
- the first filter stage also has a second group with an inductive component L2 and two capacitive components Components C21, C22 and a switch S22, which, like the components of the first group, are connected between the first phase PI and the star point ⁇ SP.
- the first filter stage can have, for example, a switch S13, which is connected between the inductive component LI and capacitive components C I 1, C 12 to the first group and between inductive component L2 and capacitive components C21, C22 to the second group.
- the first filter stage can have, for example, a switch S23, which is connected between inductive component L2 and capacitive components C21, C22 to the second group and between inductive component L3 and capacitive components C31, C32 to the second group.
- the second and third groups allow the total capacitance and the total inductance and thus the resonance frequency of the first filter stage to be adapted to the specific application.
- the control unit is set up to switch S22 and S32 simultaneously the switch S12 to operate.
- the functionality of the first filter stage is therefore referred to the explanations for FIG. 1 a.
- the filter device can have, for example, a second filter stage.
- the second filter stage has a first group of inductive and capacitive components and switches L4, C41, C42, S42, S43 and a second group of inductive and capacitive components and switches L5, C51, C52, S52.
- the groups of the second filter stage are structurally identical to the first and second groups of the first filter stage. However, the individual capacitance and inductivity values in the second filter stage can be different from those in the first filter stage in order to dampen another harmonic.
- the control unit can operate the switches S42, S52 analogously to the corresponding switches of the first filter mare.
- the functionality of the second filter stage reference is therefore made to the comments on FIG. 1a.
- the filter device can have, for example, a third filter stage.
- the third filter stage has a group of inductive and capacitive components and switches L6, C61, C62, S62 aut.
- the group of the third filter stage is structurally identical to the first group of the first filter stage.
- the individual capacitance and inductance values in the third filter stage can, however, be different from those of the first filter stage in order to in turn damp another harmonic.
- the control unit can operate the switch S62 in the same way as the corresponding switches of the first filter mare.
- the functionality of the third filter stage is therefore referred to the explanations for FIG. 1 a.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Filters And Equalizers (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019101312.7A DE102019101312A1 (de) | 2019-01-18 | 2019-01-18 | Filtervorrichtung für ein Energienetz und Verfahren zum Betrieb einer Filtervorrichtung |
| PCT/EP2020/050897 WO2020148327A1 (de) | 2019-01-18 | 2020-01-15 | Filtervorrichtung für ein energienetz und verfahren zum betrieb einer filtervorrichtung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3912247A1 true EP3912247A1 (de) | 2021-11-24 |
Family
ID=69172806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20700898.8A Pending EP3912247A1 (de) | 2019-01-18 | 2020-01-15 | Filtervorrichtung für ein energienetz und verfahren zum betrieb einer filtervorrichtung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3912247A1 (de) |
| DE (1) | DE102019101312A1 (de) |
| WO (1) | WO2020148327A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119093728B (zh) * | 2024-09-20 | 2025-05-23 | 东电检测技术(西安)有限公司 | 一种电磁噪声幅值检测的自适应滤波装置及其工作方法 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE501786C2 (sv) * | 1993-09-20 | 1995-05-15 | Asea Brown Boveri | Förfarande för övervakning och styrning av en till ett elektriskt kraftnät ansluten anläggningsdel |
| DE29822425U1 (de) * | 1998-12-16 | 1999-03-18 | Asea Brown Boveri AB, Västerås | Filtereinrichtung |
| CN201860110U (zh) * | 2010-11-03 | 2011-06-08 | 武汉理工大学 | 基于绝缘栅双极晶体管的动态谐波滤波器 |
| ES2634668T3 (es) * | 2015-03-05 | 2017-09-28 | "Condensator Dominit" Dr. Christian Dresel Gesellschaft für Leistungselektronik, Energietechnik und Netzqualität mbH | Filtro pasivo de armónicos de corriente alterna y distorsiones |
| CN104934980A (zh) * | 2015-07-13 | 2015-09-23 | 江苏现代电力科技股份有限公司 | 可自动调谐的低压无源滤波补偿装置 |
-
2019
- 2019-01-18 DE DE102019101312.7A patent/DE102019101312A1/de active Pending
-
2020
- 2020-01-15 EP EP20700898.8A patent/EP3912247A1/de active Pending
- 2020-01-15 WO PCT/EP2020/050897 patent/WO2020148327A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020148327A1 (de) | 2020-07-23 |
| DE102019101312A1 (de) | 2020-07-23 |
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