CN111371098A - Anti-noise power grid harmonic treatment system - Google Patents
Anti-noise power grid harmonic treatment system Download PDFInfo
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- CN111371098A CN111371098A CN202010271653.9A CN202010271653A CN111371098A CN 111371098 A CN111371098 A CN 111371098A CN 202010271653 A CN202010271653 A CN 202010271653A CN 111371098 A CN111371098 A CN 111371098A
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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
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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]
Abstract
The invention relates to the technical field of power systems, in particular to an anti-noise power grid harmonic treatment system, which comprises: a static reactive compensation circuit and a hybrid active power filter circuit; the static reactive power compensation circuit and the hybrid active power filter circuit are respectively connected with a three-phase power grid in parallel; the hybrid active power filter circuit includes: a passive power filter and an active power filter connected in series with each other. The invention can effectively inhibit harmonic noise in the power grid.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an anti-noise power grid harmonic treatment system.
Background
In recent years, various high-power nonlinear electronic devices (such as electric arc furnaces and milk steel machines in factories and air conditioners in civil buildings) of power consumers are increasing, and a great burden is imposed on a power grid. When current flows through the nonlinear electronic equipment, the current and the applied voltage are not in a linear relation, a non-sinusoidal current is formed, and therefore harmonic waves are generated. Harmonic pollution in the current power system is increasingly serious, harmonic interference is a large 'public nuisance' which influences the quality of electric energy, the safe and stable operation of the power system is seriously threatened, and countermeasures are urgently needed to be taken.
The harmonic wave can reduce the power supply quality of the power grid, and a large amount of harmonic wave current flows in the system, so that the voltage and the current in the power grid are distorted, and the electric energy is wasted. A harmonic current test is carried out on a rotating motor and the like in a multi-metal factory by non-ferrous metal Limited liability company in the Hunan persimmon bamboo garden, the total harmonic distortion rate of the current is 4.3% -24.7%, the total harmonic distortion rate of the voltage reaches 4%, the content of each subharmonic is far higher than the specification of national standard GB/T14549-1993 harmonic of electric energy quality public power grids, and the power distribution condition of electric equipment is seriously influenced.
The large amount of absorbed harmonic waves can cause overcurrent of a capacitor, a frequency converter and the like, so that the dielectric loss of a terminal of equipment is increased, the equipment is heated, and the service life is shortened. The harmonic current can also generate electromagnetic interference, cause local series and parallel resonance of a transformer substation, cause damage such as power supply interruption and power grid cracking, and greatly increase the probability of damage or misoperation of control equipment.
The impact and damage of harmonics on the power system environment can not be of small magnitude. The harmonic pollution range is large, the distance is long, the propagation is fast, and the pollution degree to the power grid is more serious than the pollution of a chemical plant to the atmospheric environment. The transformer can generate the situation of generating heat under the influence of harmonic waves, and has the risk of causing fire when the situation of generating heat is serious.
Disclosure of Invention
The anti-noise power grid harmonic treatment system provided by the invention can effectively suppress harmonic noise in a power grid.
The invention provides a multi-greenhouse centralized control system, which comprises: the system comprises an FPGA and a plurality of groups of adjusting mechanisms;
the FPGA comprises: a control module;
the control module is used for anti-noise power grid harmonic treatment system, and is characterized by comprising: a static reactive compensation circuit and a hybrid active power filter circuit;
the static reactive power compensation circuit and the hybrid active power filter circuit are respectively connected with a three-phase power grid in parallel;
the hybrid active power filter circuit includes: a passive power filter and an active power filter connected in series with each other.
Further, the static reactive compensation circuit comprises reactive compensation circuits with the same three-phase structure;
each phase reactive compensation circuit includes: the first inductor, the second inductor, the thyristor group and the first capacitor;
the thyristor group is formed by connecting two thyristors connected in parallel at the tail end;
the thyristor group is connected with the second inductor in series and then connected with the first capacitor in parallel to form a thyristor control reactor;
the first inductor and the thyristor control reactor are connected in series to form a reactive power compensation circuit;
the three-phase reactive compensation circuit is connected to a three-phase power grid in a triangular connection mode.
Still further, the passive power filter three-phase branch: a third harmonic series resonance branch, a fifth harmonic series resonance branch and a seventh harmonic series resonance branch;
each phase branch is formed by connecting corresponding inductance and capacitance in series.
Still further, the active power filter includes: the device comprises a detection circuit, a control module, a PWM (pulse-width modulation) driving circuit and an IGBT (insulated gate bipolar transistor) module;
the detection circuit obtains a compensation current signal according to the output current of the detection passive power filter;
the control module adjusts according to the compensation current signal to obtain a trigger pulse signal;
and the IGBT module obtains harmonic suppression current according to the trigger pulse signal and the driving signal generated by the PWM driving circuit.
In the above technical solution, the detection circuit obtains the compensation current signal by a wavelet threshold value dryness detection method.
In the above technical solution, the control module obtains the trigger pulse signal by proportional-integral adjustment.
Preferably, the PWM driving circuit obtains the driving signal by using triangular carrier modulation.
Preferably, the IGBT module comprises three-phase IGBT circuits, each phase IGBT circuit comprising three sets of H-bridge rectifiers.
Preferably, the detection circuit is specifically configured to:
selecting a wavelet base, determining the number of decomposition layers, and performing wavelet decomposition on the output current of the passive power detection filter;
selecting a threshold value and a threshold value function, and carrying out thresholding treatment on a coefficient obtained by wavelet decomposition;
and performing wavelet reconstruction on the processed signal to obtain a compensation current signal.
Preferably, the threshold function is:
in the formula: λ is a threshold value, wj,kAre the wavelet coefficients before thresholding and,
it is the thresholded wavelet coefficients, α the parameters that determine the function asymptotes, the parameter n determines the shape of the function, and the system can switch between soft and hard threshold functions by adjusting the n threshold function, the system sets the relevant parameters α to 0.7 and n to 6.
The invention adopts a hybrid topological structure of the static reactive compensator connected in parallel with the hybrid active power filter, and can overcome the problems that the filter with a single structure cannot be compatible with large capacity and high precision. Most harmonic waves in the system are absorbed and filtered by a passive power filter, the impedance is dynamically adjusted by using a small-capacity active power filter, harmonic amplification is inhibited, and then reactive power is compensated through a static reactive power compensator. The invention obtains the effect of independently adopting the scheme of the active power filter at lower cost, and breaks through the limitation that the active power filter can not be applied to occasions with large capacity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a system configuration according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an active power filter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the control principle for the IGBT module according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of triangular carrier modulation according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating the effect of current compensation in the system according to the embodiment of 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. 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.
As shown in fig. 1, the anti-noise power grid harmonic suppression system provided by this embodiment includes: a static reactive compensation circuit 1 and a hybrid active power filter circuit 2;
the static reactive power compensation circuit 1 and the hybrid active power filter circuit 2 are respectively connected with a three-phase power grid in parallel;
the hybrid active power filter circuit 2 includes: a passive power filter 2.1 and an active power filter 2.2 connected in series with each other.
In this embodiment, a Static Var Compensation (SVC) circuit 1 is used to compensate reactive power in a power grid, filter a small amount of harmonic current, and balance a three-phase power grid; a hybrid active power filter circuit (HAPF)2 is used to filter out most of the harmonic currents.
The static reactive compensation circuit 1 comprises reactive compensation circuits with the same three-phase structure;
each phase reactive compensation circuit includes: a first inductor L1, a second inductor L2, a thyristor group V and a first capacitor C1;
the thyristor group V is formed by connecting two thyristors connected in parallel at the tail end;
the thyristor group V is connected with a second inductor L2 in series and then connected with a first capacitor C1 in parallel to form a thyristor controlled reactor;
the first inductor L1 and the thyristor controlled reactor are connected in series to form a reactive power compensation circuit;
the three-phase reactive compensation circuit is connected to a three-phase power grid in a triangular connection mode.
In the embodiment, the SVC1 prevents harmonic current of multiple of three from flowing into the power grid, and reactive power can be continuously adjusted in positive and negative directions. The HAPF2 adopts a composite control mode combining feedback control and feedforward control, and simultaneously detects load harmonic current (feedback) and power supply harmonic current (feedforward), wherein the instruction current mainly comes from the load current.
The passive power filter 2.1 three-phase branch: a third harmonic series resonance branch, a fifth harmonic series resonance branch and a seventh harmonic series resonance branch; each phase branch is formed by connecting corresponding inductance and capacitance in series.
In this embodiment, the passive power filter (LC)2.1 comprises the three single-tuned filter branches, respectively: a reactor L3 and a capacitor C3 are connected in series to form a 3-order harmonic series resonance branch, a reactor L5 and a capacitor C5 are connected in series to form a 5-order harmonic series resonance branch, and a reactor L7 and a capacitor C7 are connected in series to form a 7-order harmonic series resonance branch, so that third, fifth and seventh harmonic currents generated by a nonlinear load are respectively shunted, and the three-order harmonic currents, the fifth harmonic currents and the seventh harmonic currents are main flow channels of low-frequency harmonic currents.
As shown in fig. 2, the Active Power Filter (APF)2.2 comprises: the detection circuit 2.21, the control module 2.22, the PWM drive circuit 2.23 and the IGBT module 2.24;
the detection circuit 2.21 obtains a compensation current signal according to the output current of the detection passive power filter 2.1;
the control module 2.22 adjusts according to the compensation current signal to obtain a trigger pulse signal;
and the IGBT module 2.24 obtains harmonic wave governing current according to the trigger pulse signal and the driving signal generated by the PWM driving circuit 2.23.
As shown in fig. 1 and 2, the IGBT module 2.24 comprises three-phase IGBT circuits, each phase IGBT circuit comprising three sets of H-bridge rectifiers. The H-bridge rectifier has the main advantages that the required voltage withstanding value of a power device is reduced, phase voltage is added to each H-bridge arm instead of line voltage, the requirement on the voltage value of a capacitor is reduced, the system is in a safer environment, and the controllability and the independence of the system are ensured.
In this embodiment, the control module 2.22 uses proportional-integral adjustment to obtain the trigger pulse signal. The control module 2.22 is thus a PI regulator.
As shown in fig. 2 and 3, the IGBT module 2.24 is the actuator of the overall system, responsible for generating the compensation current. The dc side capacitor in the IGBT module 2.24 is a voltage source for compensating current, and the stabilization of the dc side capacitor voltage affects the harmonic compensation effect. Therefore, before controlling the main circuit switching device, the dc side capacitor voltage needs to be closed-loop controlled. The left side of the dotted line in fig. 3 is the dc side capacitor voltage control principle.
The detection circuit 2.21 obtains a compensation current signal by a wavelet threshold value dryness detection method; the detection method comprises the following steps:
step 2, selecting a threshold value and a threshold value function, and carrying out thresholding treatment on a coefficient obtained by wavelet decomposition;
and 3, performing wavelet reconstruction on the processed signal to obtain a compensation current signal.
The threshold function is:
in the formula: λ is a threshold value, wj,kAre the wavelet coefficients before thresholding and,
it is the thresholded wavelet coefficients, α the parameters that determine the function asymptotes, the parameter n determines the shape of the function, and the system can switch between soft and hard threshold functions by adjusting the n threshold function, the system sets the relevant parameters α to 0.7 and n to 6.
In the threshold function algorithm, commonly used threshold functions include hard threshold and soft threshold functions. The soft threshold function and the hard threshold function can be flexibly switched by adjusting the n threshold function, the threshold function is continuous first-order conductibility, and smooth transition of an optimized signal can be better realized by continuously changing the value of a parameter. There is some irrationality in increasing the number of decomposition layers with a fixed threshold, so the original threshold is adjusted, j being the number of decomposition layers. The threshold is made between the soft and hard threshold functions by changing the size of the pairs.
The improved threshold function can not only realize flexible change of the shape of the function, but also well realize smooth transition. Therefore, the design adopts the hard threshold function optimization on the harmonic signals at high frequency, mainly filters most noise, adopts the soft threshold function optimization on the low frequency upper coefficient, and realizes the retention of useful signals. This preserves the original properties of the useful signal as much as possible while optimizing them to the greatest possible extent.
As shown in fig. 4 and 5, the PWM driving circuit 2.23 uses triangular carrier modulation to obtain the driving signal.
In this embodiment, the PWM driving circuit 2.23 uses a triangular carrier modulation (SPWM) method, the detection circuit 2.21 detects a harmonic existing in the output current of the LC2.2, a signal for generating a trigger pulse is obtained through the proportional-integral controller (PI)2.22, and the trigger pulse triggers the IGBT module 2.24 to obtain a current opposite to the harmonic current in combination with a current control strategy, so that the current achieves a compensation effect.
Compared with the traditional hysteresis comparison control method, the triangular carrier current control method has a fixed switching frequency, and can obtain higher-quality compensation current by matching with the SVC 1.
Fig. 4 is a diagram of triangular carrier modulation demonstrated using a sine wave instead of a command current signal. When the sine wave amplitude is greater than the triangular wave amplitude, the PWM signal is +1, and when the sine wave amplitude is less than the triangular wave amplitude, the PWM signal is-1.
Fig. 5 shows the compensation effect of the system current by simulation. The diagram is sequentially provided with a power grid current waveform before compensation, a compensation current waveform and a power grid current waveform after compensation from bottom to top. It can be seen that the system has a fast compensation response speed, the waveform of the compensated power grid current is approximate to a sine wave, and most harmonic current is filtered. Comparing the current waveforms of the power network before and after compensation, it is found that a phase shift is generated because the system has a certain reactive power compensation effect.
The invention adopts a hybrid topological structure that the static reactive compensator 1 is connected in parallel with the hybrid active power filter 2, and can overcome the problems that a single-structure filter cannot be compatible with large capacity and high precision. Most harmonic waves in the system are absorbed and filtered by a passive power filter 2.1, impedance is dynamically adjusted by using a small-capacity active power filter 2.2, harmonic amplification is inhibited, and reactive power is compensated through a static reactive power compensator 1. The mode obtains the effect of independently adopting the scheme of the active power filter at lower cost, and breaks through the limitation that the active power filter cannot be applied to occasions with large capacity.
It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy presented.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An anti-noise power grid harmonic treatment system, comprising: the device comprises a static reactive compensation circuit (1) and a hybrid active power filter circuit (2);
the static reactive power compensation circuit (1) and the hybrid active power filter circuit (2) are respectively connected with a three-phase power grid in parallel;
the hybrid active power filter circuit (2) comprises: a passive power filter (2.1) and an active power filter (2.2) connected in series with each other.
2. The antinoise power grid harmonic treatment system according to claim 1, characterized in that said static reactive compensation circuit (1) comprises a reactive compensation circuit of the same three-phase structure;
each phase reactive compensation circuit includes: a first inductor (L1), a second inductor (L2), a thyristor group (V) and a first capacitor (C1);
the thyristor group (V) is formed by connecting two thyristors in parallel in a tail-to-tail connection manner;
the thyristor group (V) is connected with a second inductor (L2) in series and then is connected with a first capacitor (C1) in parallel to form a thyristor controlled reactor;
the first inductor (L1) is connected with the thyristor controlled reactor in series to form a reactive power compensation circuit;
the three-phase reactive compensation circuit is connected to a three-phase power grid in a triangular connection mode.
3. The antinoise power grid harmonic treatment system according to claim 1, characterized in that said passive power filter (2.1) three-phase branch: a third harmonic series resonance branch, a fifth harmonic series resonance branch and a seventh harmonic series resonance branch;
each phase branch is formed by connecting corresponding inductance and capacitance in series.
4. The antinoise power grid harmonic treatment system according to claim 1, characterized in that said active power filter (2.2) comprises: the device comprises a detection circuit (2.21), a control module (2.22), a PWM (pulse-width modulation) driving circuit (2.23) and an IGBT module (2.24);
the detection circuit (2.21) obtains a compensation current signal according to the output current of the detection passive power filter (2.1);
the control module (2.22) adjusts according to the compensation current signal to obtain a trigger pulse signal;
and the IGBT module (2.24) obtains harmonic wave governing current according to the trigger pulse signal and the driving signal generated by the PWM driving circuit (2.23).
5. The antinoise power grid harmonic treatment system according to claim 4, characterized in that said detection circuit (2.21) derives the compensation current signal by means of a wavelet threshold de-drying detection method.
6. The anti-noise power grid harmonic treatment system according to claim 4, characterized in that the control module (2.22) derives the trigger pulse signal using proportional-integral regulation.
7. The anti-noise power grid harmonic treatment system according to claim 6, characterized in that the PWM driving circuit (2.23) derives the driving signal using triangular carrier modulation.
8. The anti-noise power grid harmonic treatment system according to claim 4, characterized in that the IGBT module (2.24) comprises three-phase IGBT circuits, each phase IGBT circuit comprising three sets of H-bridge rectifiers.
9. The antinoise power grid harmonic treatment system according to claim 5, characterized in that said detection circuit (2.21), in particular for:
selecting a wavelet basis, determining the number of decomposition layers, and performing wavelet decomposition on the output current of the detection passive power filter (2.1);
selecting a threshold value and a threshold value function, and carrying out thresholding treatment on a coefficient obtained by wavelet decomposition;
and performing wavelet reconstruction on the processed signal to obtain a compensation current signal.
10. The anti-noise power grid harmonic treatment system of claim 8, wherein the threshold function is:
in the formula: λ is a threshold value, wj,kAre the wavelet coefficients before thresholding and,
it is the thresholded wavelet coefficients, α the parameters that determine the function asymptotes, the parameter n determines the shape of the function, and the system can switch between soft and hard threshold functions by adjusting the n threshold function, the system sets the relevant parameters α to 0.7 and n to 6.
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