CN105281332B - A kind of hybrid active electric filter and its control method of high-voltage chain type structure - Google Patents

A kind of hybrid active electric filter and its control method of high-voltage chain type structure Download PDF

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CN105281332B
CN105281332B CN201410233826.2A CN201410233826A CN105281332B CN 105281332 B CN105281332 B CN 105281332B CN 201410233826 A CN201410233826 A CN 201410233826A CN 105281332 B CN105281332 B CN 105281332B
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mfrac
mtd
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filter
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CN105281332A (en
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黄燕艳
周方圆
蔡蔚
龙礼兰
沈辉
吴强
罗仁俊
王才孝
龚芬
曹洋
张定华
胡前
朱建波
涂绍平
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Zhuzhou National Engineering Research Center of Converters Co Ltd
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Zhuzhou National Engineering Research Center of Converters Co Ltd
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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 discloses a kind of hybrid active electric filter and its control method of high-voltage chain type structure, the wave filter includes chain structure current transformer, filter reactor and high-pass filter；The chain structure current transformer is the structure current transformer with bypass, and the chain structure current transformer uses H bridge modules, and each DC bus capacitor is separate；The chain structure current transformer is in parallel with high-pass filter by filter reactor, then accesses power network again, is connected respectively with the phase in power network.The control method is based on above-mentioned filter construction, and including the detection of harmonic wave frequency dividing, APF harmonic closed-loop control, reactive-load compensation and the control of APF mean direct voltages, voltage balance control.The present invention has the advantages that simple and compact for structure, cost is cheap, functional reliability is good, superior performance.

Description

A kind of hybrid active electric filter and its control method of high-voltage chain type structure
Technical field
Present invention relates generally to the electric-power filter field in high-pressure system, refer in particular to a kind of based on high-voltage chain type structure Hybrid active electric filter and its control method.
Background technology
At present, following three kinds of modes are mainly used applied to the Active Power Filter-APF in high-pressure system：
First, compensation harmonic electric current is produced using three phase full bridge current transformer, by accessing high-voltage fence after transformer boost, The shortcomings which be three phase full bridge circuit by the blocking voltage of IGBT device limited can not direct output HIGH voltage, this causes At Large Copacity application scenario, low-pressure side needs to use multiple three phase full bridge circuit in parallel, so that low-voltage bus bar electric current is very It is huge.Huge low-tension current not only causes active filter loss unmanageable, and magnetic field caused by high current also can be right Surrounding devices have a negative impact.Therefore, the not competent Large Copacity application scenario of this kind of Active Power Filter-APF.
The increase of extensive use and nonlinear-load however as various power converter technologies, the demand of harmonic wave control and Capacity is rendered as the industries such as ascendant trend year by year, particularly smelting enterprise, wind-powered electricity generation photovoltaic, so this Active Power Filter-APF Structure does not utilize extensive use.
Second, high pressure direct hanging type Active Power Filter-APF, the Active Power Filter-APF of this form, passes through unsteady flow mould of connecting Block (being typically H bridge modules) obtains higher output voltage.The advantages of which, is connected by multiple converter modules, can be with Using CPS-PWM modulation systems so that the resultant voltage of output has higher equivalent switching frequency, although which improves Equivalent switching frequency, but which still suffer from compensation overtone order it is limited the problem of, it is straight that this is due to that various high-low pressures are handed over Ac frequency converter and hf rectifier in industrial circle using more and more extensive so that positioned at the Electric Network Higher Harmonic of load center Problem is increasingly severe, and these higher hamonic waves invade other circuits and can cause to seriously endanger, therefore the active electric power filter of the form Ripple device also has its limitation.
Third, hybrid active electric filter, this kind of Active Power Filter-APF is divided into two kinds again：
One kind is based on three-phase bridge converter and boosting injected mixed active power filter, although reducing active Partial capacity, but due to being connected using injection circuit, current transformer with passive filter.It is to be serially connected in due to unsteady flow first Device is cascaded with single tuned filter, and single tuned filter has higher impedance for higher hamonic wave, therefore for high order Harmonic wave, it is particularly weak close to the limitation of high harmonics ability of converter switches frequency；Secondly as it is connected on single tuned filter On, while current transformer also has output filter in itself so that the controlling transmission spy of current transformer newly becomes extremely complex, although state The inside and outside control to pouring-in compound filter has carried out many researchs, but its control stability still has much room for improvement, easily by The influence of wave filter manufacture level and tuned frequency accuracy；3rd, although injected mixed active wave filter can drop significantly Low active part capacity, but the reduction of active part capacity so that equivalent to one stabilization of the type hybrid active electric filter Capacitive reactive power source, only existing harmonic wave, or load is idle does not fluctuate larger occasion, it is still desirable to which dynamic passive compensation fills Put and coordinate with it.
Another kind is the injection active power filter using H bridge chain structures, and this kind uses the more level of chain structure Current transformer is connected with passive single tuned filter and is characterized.Although improving the capacity of injected mixed active power filtering, There is also shortcoming, although active filter is in parallel with passive filter to add harmonic ability, due to not using Divide compensation way, it is easy to make active filter that resonance occur with passive filter.Although injection type hybrid active filter The Detection Methods with Separate Frequency based on nth harmonic dq coordinate systems is proposed, but this method is mainly filtered using LPF, it is low Harmonic wave after bandpass filter filters out accounts for fundamental component, and phase delay is difficult to preferably compensate, and detection real-time is general；Although simultaneously certain Also it has been designed into a little pouring-in compound filters using the method that harmonic wave frequency dividing control is carried out the methods of neutral net, but by In the harmonic wave detected superimposing compensation signal, this is to carry out frequency dividing control again, not only adds amount of calculation, while there is also Interfere problem.
The content of the invention
The technical problem to be solved in the present invention is that：For technical problem existing for prior art, the present invention provides one Kind is simple and compact for structure, cost is cheap, functional reliability is good, the superior performance hybrid active electric based on high-voltage chain type structure Wave filter and its control method.
In order to solve the above technical problems, the present invention uses following technical scheme：
A kind of hybrid active electric filter of high-voltage chain type structure, including chain structure current transformer, filter reactor and High-pass filter；The chain structure current transformer is the structure current transformer with bypass, and the chain structure current transformer uses H bridges Module, each DC bus capacitor are separate；The chain structure current transformer is in parallel with high-pass filter by filter reactor, Then power network is accessed again, is connected respectively with the phase in power network.
As a further improvement on the present invention：The high-pass filter is bivalent high-pass filter, the high-pass filter In filter inductance it is in parallel with absorption resistance after, then connect with filter capacitor.
The present invention also provides a kind of hybrid active electric filter of high-voltage chain type structure, including chain structure current transformer, Step-up transformer and high-pass filter；The chain structure current transformer uses H bridge modules, and each DC bus capacitor is separate； The chain structure current transformer is in parallel with high-pass filter by step-up transformer, then accesses power network again.
As a further improvement on the present invention：The high-pass filter is bivalent high-pass filter, the high-pass filter In filter inductance it is in parallel with absorption resistance after, then connect with filter capacitor.
As a further improvement on the present invention：The chain structure current transformer (2) is the structure current transformer with bypass.
The present invention furthermore provides a kind of control method based on above-mentioned hybrid active electric filter, including harmonic wave point Frequency detects, and harmonic wave divides the step of detecting and is：
(1.1) system side electric current I is taken firstA、IB、IC, using formula (1), for jth subharmonic then in use, conversion square Battle array is Cj, j subharmonic can be transformed into j dq coordinate system, now less than j times and its above harmonic amplitude is idjAnd phase For iqj；
(1.2) by idjBy high-pass filtering, AC compounent after filtering out simultaneously obtains the more high order than j times by phase compensation D axis AC componentsAgain willWith idjD axle direct current signal of the jth subharmonic under j dq coordinate system is obtained more afterwardsIts For mapping of the j subharmonic amplitude information in j dq coordinate system；By iqjThrough the filtered AC compounent of high-pass filtering and pass through phase Position compensation obtains the q axis AC components of the more high order than j timesAgain willSat with obtaining jth subharmonic after iqj in j dq The lower q axle DC component signals of mark systemIt is mapping of the j subharmonic phase information in j dq coordinate system.
The present invention furthermore provides a kind of control method based on above-mentioned hybrid active electric filter, including active electrical Force filter harmonic wave closed-loop control, it is the step of APF harmonic closed-loop control：
(2.1) following formula (2) is utilized, transformation matrix is then used for j subharmonicThe jth time that frequency dividing detection is obtained is humorous Ripple d axle DC componentsWith q axle DC componentsPass through j transformation matrixAfterwards by the jth time as shown in following formula (3) The pi regulator PI of harmonic wavej, obtain the voltage u for needing to export required for absorption jth primary current under abc coordinate systemshj；
Wherein：KpjFor jth subharmonic proportionality coefficient, KijJth subharmonic integral coefficient；
(2.2) by uhj、uhj+1…uhnWith system voltage reference value usrCascade is subtracted each other, hybrid active filter output voltage Reference signal uhr。
The present invention furthermore provides a kind of control method based on above-mentioned hybrid active electric filter, including idle benefit Repay and controlled with APF mean direct voltages, the step of reactive-load compensation controls with APF mean direct voltages is：
(3.1) DC capacitor voltage of each phase converter module of three-phase high-voltage chain structure current transformer is detected respectively, its In middle formula (4), N be chain structure current transformer serial number, uAdc_iFor the DC voltage of i-th of chain link module of A phases, uBdc_i For the DC voltage of i-th of chain link module of B phases, uCdc_iFor the DC voltage of i-th of chain link module of C phases, udc_avFor wherein three-phase The module average voltage of phase current transformer, urThe voltage control signal of modules at different levels can be obtained by CPS-PWM modulation；
(3.2) by mean direct voltage value of feedback udc_avWith desired DC voltage value udcrIt is compared, through PI controllers Obtain the d components u of current transformer output voltagecd, by fundamental wave reactive power of the output current of chain type active filter under dq coordinate systems Component iqfbWith benchmark reactive current component iqrIt is compared, the q components u of current transformer output voltage is obtained through PI controllerscq, then Idle under abc coordinate systems and real power control command voltage u can be obtained by current indirect controlpq；
(3.3) by idle and real power control command voltage upqWith harmonic absorption command voltage uhrSuperposition, then obtains abc Three-phase modulations voltage command signal u under coordinater。
The present invention furthermore provides a kind of control method based on above-mentioned hybrid active electric filter, including direct current Weighing apparatus control is flattened, is the step of voltage balance control：
(4.1) by i-th of converter module DC voltage feedback signal U of ABC three-phasesAdc_i、UBdc_i、UCdc_iRespectively with Three-phase chain type current transformer mean direct voltage Udc_avSubtract each other, error amount is exported into feedback current i with ABC three-phases respectivelyoA、ioB、ioC Multiplication obtains each i-th of module modulation voltage increment U of phase after pi regulatorΔAi、UΔBi、UΔCi；
(4.2) each phase voltage modulation a reference value UAr、UBr、UCr, with each i-th of module modulation voltage increment U of phaseΔAi、UΔBi、 UΔCiAddition obtains, the final modulated signal U of i-th of module of each phaseAri、UBri、UCri。
Compared with prior art, the advantage of the invention is that：
1st, hybrid active electric filter of the invention, filtered for the Multilevel Inverters based on chain structure and passive high pass The Parallel Hybrid Active Power Filter that ripple device is formed.The present invention compensates specific subharmonic using frequency dividing detection, more by chain type Level active power filter filters out low-order harmonic (within such as 13 times), while takes into account dynamic reactive power compensation；Passive high pass Wave filter then filters out higher hamonic wave (such as more than 13 times), while takes into account and provide the compensation of part capacitive reactive power.The more level blocks of chain type Current transformer output voltage is improved, improves current transformer output capacity, while uses phase-shifting carrier wave PWM technologies, can be significantly The actual switch frequency of the full-controlled devices such as IGBT need not be increased in the case of improving equivalent switching frequency, improve higher hamonic wave The fan-out capability of electric current and the response speed of device.
2nd, hybrid active electric filter of the invention, higher hamonic wave is filtered out using passive high-pass filtering, more using chain type Level filters out intermediate frequency and low-frequency harmonics as active part current transformer, active part；Further provide corresponding control simultaneously Method, current transformer is carried out specific subharmonic compensation for demand, suppress the middle low order caused by high-pass filter is introduced into Harmonic Amplification Problem so that current transformer not only can be with high-pass filter parallel running, while can easily also be low with single tuning Pass filter forms filtering system, and current transformer can carry out reactive-load compensation while compensation harmonic if spare capacity.
Brief description of the drawings
Fig. 1 is principle schematic of the present invention in concrete application example 1.
Fig. 2 is principle schematic of the present invention in concrete application example 2.
Fig. 3 is principle schematic of the present invention in concrete application example 3.
Fig. 4 is taken during harmonic wave frequency dividing detection the principle schematic of system side electric current in control method of the present invention.
Fig. 5 is to carry out the principle schematic of harmonic amplitude detection in control method of the present invention.
Fig. 6 is to carry out the principle schematic of harmonic phase detection in control method of the present invention.
Fig. 7 is to carry out the principle schematic of harmonic wave frequency dividing control process in control method of the present invention.
Fig. 8 is that the principle in control method of the present invention when carrying out reactive-load compensation and being controlled with APF mean direct voltages is illustrated Figure.
Fig. 9 is to obtain each i-th of module modulation voltage of phase in progress voltage balance control in control method of the present invention The schematic diagram of increment.
Figure 10 is to obtain the schematic diagram of final modulated signal in progress voltage balance control in control method of the present invention.
Marginal data：
1st, filter reactor；2nd, chain structure current transformer；3rd, high-pass filter；4th, step-up transformer.
Embodiment
The present invention is described in further details below with reference to Figure of description and specific embodiment.
Embodiment 1：As shown in figure 1, the hybrid active electric filter concrete application of the high-voltage chain type structure for the present invention Electrical schematic diagram when direct screening chain structure, the hybrid active electric filter include chain structure current transformer 2, filter reactance Device 1 and high-pass filter 3；Wherein, chain structure current transformer 2 is separate using H bridge modules, each DC bus capacitor；Chain type Structure current transformer 2 is in parallel with high-pass filter 3 by filter reactor 1, then accesses power network again, respectively with the phase in power network It is connected (A/B/C three-phases).
In this example, high-pass filter 3 can use bivalent high-pass filter according to being actually needed, i.e., by filter inductance After in parallel with absorption resistance, then connect with filter capacitor.
In the said structure of the present invention, active converter employs chain structure, and its output voltage is unrestricted in theory System, can connect as needed, can access power network with direct screening, can also improve system response time, improve equivalent switching frequency. The more level active power filters of chain type are detected using frequency dividing, the harmonic wave under n-th dq coordinate systems after high-pass filter 3 Amplitude and the phase of phase signal prolong that difference is small, conveniently can realize that delay is reduced using unified phase compensation mode, improve The accuracy of frequency dividing detection.The more level active power filters of chain type and the parallel running of high-pass filter 3, due to using frequency dividing Control can solve the problems, such as that high-pass filter 3 amplifies to low-order harmonic, low in system after Active Power Filter-APF filters Subharmonic content substantially reduces.Reactive power can be compensated in the case where harmonic compensation ability is more than needed, further carried The stability of high system.High-pass filter 3 entirely can keep preferable harmonic absorption ability by high band, also be filtered out for current transformer The characteristic harmonics of switching frequency, reduce the higher hamonic wave of injection power network.
Embodiment 2：As shown in Fig. 2 the hybrid active electric filter concrete application of the high-voltage chain type structure for the present invention In boost chain structure when electrical schematic diagram, the hybrid active electric filter include chain structure current transformer 2, boosting transformation Device 4 and high-pass filter 3；Wherein, chain structure current transformer 2 is separate using H bridge modules, each DC bus capacitor；Chain type Structure current transformer 2 is in parallel with high-pass filter 3 by step-up transformer 4, then accesses power network again.
In this example, high-pass filter 3 can use bivalent high-pass filter according to being actually needed, i.e., by filter inductance After in parallel with absorption resistance, then connect with filter capacitor.
Embodiment 3：As shown in figure 3, the hybrid active electric filter concrete application of the high-voltage chain type structure for the present invention In boost chain structure when electrical schematic diagram, the hybrid active electric filter include chain structure current transformer 2, boosting transformation Device 4 and high-pass filter 3；Wherein, chain structure current transformer 2 is separate using H bridge modules, each DC bus capacitor；Chain type Structure current transformer 2 is in parallel with high-pass filter 3 by step-up transformer 4, then accesses power network again.It is different from embodiment 2 it Place is that：Unbypassed design in chain structure current transformer 2.
In this example, high-pass filter 3 can use bivalent high-pass filter according to being actually needed, i.e., by filter inductance After in parallel with absorption resistance, then connect with filter capacitor.
The present invention further provides a kind of controlling party of the hybrid active electric filter based on above-mentioned high-voltage chain type structure Method, its step are：
(1) harmonic wave frequency dividing detection；
(1.1) system side electric current I is taken firstA、IB、IC, as shown in figure 4, using formula (1), then make for jth subharmonic Used time, transformation matrix Cj, j subharmonic can be transformed into j dq coordinate system, now less than j times and its above harmonic wave width It is worth for idjIt is i with phaseqj；
(1.2) by idjBy high-pass filtering, AC compounent after filtering out simultaneously obtains the more high order than j times by phase compensation D axis AC componentsAgain willWith idjD axle DC component signal of the jth subharmonic under j dq coordinate system is obtained more afterwardsBy iqjThe q axis AC components of the more high order than j times are obtained through the filtered AC compounent of high-pass filtering and by phase compensationAgain willObtain q axle DC component signal of the jth subharmonic under j dq coordinate system more afterwards with iJ~nth harmonic Amplitude detection flow is as shown in figure 5, j~n subharmonic phase-detection is as shown in Figure 6.
(2) APF harmonic closed-loop control；What it is due to collection is system side electric current, therefore harmonic wave of the present invention divides Frequency control process is as shown in Figure 7, it is possible to achieve closed-loop control.
(2.1) following formula (2) is utilized, transformation matrix is then used for j subharmonicThe jth time that frequency dividing detection is obtained is humorous Ripple d axle DC componentsWith q axle DC componentsPass through j transformation matrixIt is humorous by the jth time as shown in following formula (3) afterwards The pi regulator PI of ripplej, obtain the voltage for needing to export required for absorption jth primary current under abc coordinate systems
Wherein：KpjFor jth subharmonic proportionality coefficient, KijJth subharmonic integral coefficient；
(2.2) by uhj、uhj+1…uhnWith system voltage reference value usrCascade is subtracted each other, hybrid active filter output voltage Reference signal uhr。
(3) reactive-load compensation controls with APF mean direct voltages；
(3.1) DC capacitor voltage of each phase converter module of three-phase high-voltage chain structure current transformer is detected respectively, its In middle formula (4), N be chain structure current transformer serial number, uAdc_iFor the DC voltage of i-th of chain link module of A phases, uBdc_i For the DC voltage of i-th of chain link module of B phases, uCdc_iFor the DC voltage of i-th of chain link module of C phases, udc_avFor wherein three-phase The module average voltage of phase current transformer, urThe voltage control signal of modules at different levels can be obtained by CPS-PWM modulation
(3.2) as shown in figure 8, by mean direct voltage value of feedback udc_avWith desired DC voltage value udcrIt is compared, The d components u of current transformer output voltage is obtained through PI controllerscd, by the output current of chain type active filter under dq coordinate systems Fundamental reactive component iqfbWith benchmark reactive current component iqrIt is compared, the q of current transformer output voltage is obtained through PI controllers Component ucq, then idle and real power control command voltage u under abc coordinate systems can be obtained by current indirect controlpq；
(3.3) by idle and real power control command voltage upqWith harmonic absorption command voltage uhrSuperposition, then obtains abc Three-phase modulations voltage command signal u under coordinater。
(4) voltage balance control strategy；
(4.1) as shown in figure 9, i-th of converter module DC voltage feedback signal U by ABC three-phasesAdc_i、UBdc_i、 UCdc_iRespectively with three-phase chain type current transformer mean direct voltage Udc_avSubtract each other, error amount is exported into feedback electricity with ABC three-phases respectively Flow ioA、ioB、ioCMultiplication obtains each i-th of module modulation voltage increment U of phase after pi regulatorΔAi、UΔBi、UΔCi；
(4.2) as shown in Figure 10, each phase voltage modulation a reference value UAr、UBr、UCr, increase with each i-th of module modulation voltage of phase Measure UΔAi、UΔBi、UΔCiAddition obtains, the final modulated signal U of i-th of module of each phaseAri、UBri、UCri。
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment, All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art For those of ordinary skill, some improvements and modifications without departing from the principles of the present invention, the protection of the present invention should be regarded as Scope.

Claims (9)

  1. A kind of 1. hybrid active electric filter of high-voltage chain type structure, it is characterised in that including chain structure current transformer (2), Filter reactor (1) and high-pass filter (3)；The chain structure current transformer (2) is the structure current transformer with bypass, described Chain structure current transformer (2) uses H bridge modules, and each DC bus capacitor is separate；The chain structure current transformer (2) passes through Filter reactor (1) is in parallel with high-pass filter (3), then accesses power network again, is connected respectively with the phase in power network；The chain Formula structure current transformer (2) is detected using frequency dividing, and the harmonic wave divides the step of detecting and is：
    (1.1) system side electric current I is taken firstA、IB、IC, using formula (1), for jth subharmonic then in use, transformation matrix is Cj, j subharmonic can be transformed into j dq coordinate system, now less than j times and its above harmonic amplitude is idjIt is with phase iqj；
    <mrow> <msub> <mi>C</mi> <mi>n</mi> </msub> <mo>=</mo> <msqrt> <mfrac> <mn>2</mn> <mn>3</mn> </mfrac> </msqrt> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <mrow> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>-</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>+</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>cos</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>-</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>cos</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>+</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
    (1.2) by idjBy high-pass filtering, AC compounent after filtering out simultaneously obtains the d axles of the more high order than j times by phase compensation AC compounentAgain willWith idjD axle DC component signal of the jth subharmonic under j dq coordinate system is obtained more afterwardsWill iqjThe q axis AC components of the more high order than j times are obtained through the filtered AC compounent of high-pass filtering and by phase compensationAgain willWith iqjQ axle DC component signal of the jth subharmonic under j dq coordinate system is obtained more afterwards.
  2. 2. the hybrid active electric filter of high-voltage chain type structure according to claim 1, it is characterised in that the high pass Wave filter (3) is bivalent high-pass filter, after the filter inductance in the high-pass filter (3) is in parallel with absorption resistance, then with Filter capacitor is connected.
  3. A kind of 3. hybrid active electric filter of high-voltage chain type structure, it is characterised in that including chain structure current transformer (2), Step-up transformer (4) and high-pass filter (3)；The chain structure current transformer (2) uses H bridge modules, each DC bus capacitor Independently of each other；The chain structure current transformer (2) is in parallel with high-pass filter (3) by step-up transformer (4), then accesses again Power network；The chain structure current transformer (2) is detected using frequency dividing, and the harmonic wave divides the step of detecting and is：
    (1.1) system side electric current I is taken firstA、IB、IC, using formula (1), for jth subharmonic then in use, transformation matrix is Cj, j subharmonic can be transformed into j dq coordinate system, now less than j times and its above harmonic amplitude is idjIt is with phase iqj；
    <mrow> <msub> <mi>C</mi> <mi>n</mi> </msub> <mo>=</mo> <msqrt> <mfrac> <mn>2</mn> <mn>3</mn> </mfrac> </msqrt> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <mrow> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>-</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>+</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>cos</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>-</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>cos</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>+</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
    (1.2) by idjBy high-pass filtering, AC compounent after filtering out simultaneously obtains the d axles of the more high order than j times by phase compensation AC compounentAgain willWith idjD axle DC component signal of the jth subharmonic under j dq coordinate system is obtained more afterwardsWill iqjThe q axis AC components of the more high order than j times are obtained through the filtered AC compounent of high-pass filtering and by phase compensationAgain willWith iqjQ axle DC component signal of the jth subharmonic under j dq coordinate system is obtained more afterwards.
  4. 4. the hybrid active electric filter of high-voltage chain type structure according to claim 3, it is characterised in that the high pass Wave filter (3) is bivalent high-pass filter, after the filter inductance in the high-pass filter (3) is in parallel with absorption resistance, then with Filter capacitor is connected.
  5. 5. the hybrid active electric filter of high-voltage chain type structure according to claim 3, it is characterised in that the chain type Structure current transformer (2) is the structure current transformer with bypass.
  6. 6. a kind of control method based on any one hybrid active electric filter in the claims 1~5, its feature exist In, including harmonic wave frequency dividing detection, harmonic wave frequency dividing detection the step of be：
    (1.1) system side electric current I is taken firstA、IB、IC, using formula (1), for jth subharmonic then in use, transformation matrix is Cj, j subharmonic can be transformed into j dq coordinate system, now less than j times and its above harmonic amplitude is idjIt is with phase iqj；
    <mrow> <msub> <mi>C</mi> <mi>n</mi> </msub> <mo>=</mo> <msqrt> <mfrac> <mn>2</mn> <mn>3</mn> </mfrac> </msqrt> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <mrow> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>-</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>+</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>cos</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>-</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>cos</mi> <mrow> <mo>(</mo> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>+</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
    (1.2) by idjBy high-pass filtering, AC compounent after filtering out simultaneously obtains the d axles of the more high order than j times by phase compensation AC compounentAgain willWith idjD axle DC component signal of the jth subharmonic under j dq coordinate system is obtained more afterwardsWill iqjThe q axis AC components of the more high order than j times are obtained through the filtered AC compounent of high-pass filtering and by phase compensationAgain willWith iqjQ axle DC component signal of the jth subharmonic under j dq coordinate system is obtained more afterwards
  7. 7. the control method of hybrid active electric filter according to claim 6, it is characterised in that including active electric power Wave filter harmonic wave closed-loop control, it is the step of APF harmonic closed-loop control：
    (2.1) following formula (2) is utilized, transformation matrix is then used for j subharmonicThe jth subharmonic d axles for detecting and obtaining will be divided DC componentWith q axle DC componentsPass through j transformation matrixAfterwards by the PI of the jth subharmonic as shown in following formula (3) Adjuster PIj, obtain the voltage u for needing to export required for absorption jth primary current under abc coordinate systemshj；
    <mrow> <msubsup> <mi>C</mi> <mi>n</mi> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msubsup> <mo>=</mo> <msqrt> <mfrac> <mn>2</mn> <mn>3</mn> </mfrac> </msqrt> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <mrow> <mi>sin</mi> <mrow> <mo>(</mo> <mrow> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>+</mo> <mfrac> <mi>&amp;pi;</mi> <mn>2</mn> </mfrac> </mrow> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>cos</mi> <mrow> <mo>(</mo> <mrow> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>+</mo> <mfrac> <mi>&amp;pi;</mi> <mn>2</mn> </mfrac> </mrow> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>sin</mi> <mrow> <mo>(</mo> <mrow> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>-</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>+</mo> <mfrac> <mi>&amp;pi;</mi> <mn>2</mn> </mfrac> </mrow> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>cos</mi> <mrow> <mo>(</mo> <mrow> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>-</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>+</mo> <mfrac> <mi>&amp;pi;</mi> <mn>2</mn> </mfrac> </mrow> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>sin</mi> <mrow> <mo>(</mo> <mrow> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>+</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>+</mo> <mfrac> <mi>&amp;pi;</mi> <mn>2</mn> </mfrac> </mrow> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>cos</mi> <mrow> <mo>(</mo> <mrow> <mi>n</mi> <mi>&amp;omega;</mi> <mi>t</mi> <mo>+</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>+</mo> <mfrac> <mi>&amp;pi;</mi> <mn>2</mn> </mfrac> </mrow> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
    <mrow> <msub> <mi>PI</mi> <mi>j</mi> </msub> <mo>=</mo> <msub> <mi>Kp</mi> <mi>j</mi> </msub> <mo>+</mo> <mfrac> <mrow> <msub> <mi>Ki</mi> <mi>j</mi> </msub> </mrow> <mi>s</mi> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>
    Wherein：KpjFor jth subharmonic proportionality coefficient, KijJth subharmonic integral coefficient；
    (2.2) by uhj、uhj+1…uhnWith system voltage reference value usrCascade is subtracted each other, and hybrid active filter output voltage is with reference to letter Number uhr。
  8. 8. the control method of hybrid active electric filter according to claim 7, it is characterised in that including reactive-load compensation Controlled with APF mean direct voltages, the step of reactive-load compensation controls with APF mean direct voltages is：
    (3.1) DC capacitor voltage of each phase converter module of three-phase high-voltage chain structure current transformer is detected respectively, wherein public In formula (4), N be chain structure current transformer serial number, uAdc_iFor the DC voltage of i-th of chain link module of A phases, uBdc_iFor B phases The DC voltage of i-th of chain link module, uCdc_iFor the DC voltage of i-th of chain link module of C phases, udc_avFor wherein three-phase phase transformation Flow the module average voltage of device, urThe voltage control signal of modules at different levels can be obtained by CPS-PWM modulation；
    <mrow> <msub> <mi>u</mi> <mrow> <mi>d</mi> <mi>c</mi> <mo>_</mo> <mi>a</mi> <mi>v</mi> </mrow> </msub> <mo>=</mo> <mrow> <mo>(</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>u</mi> <mrow> <mi>A</mi> <mi>d</mi> <mi>c</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> <mo>+</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>u</mi> <mrow> <mi>B</mi> <mi>d</mi> <mi>c</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> <mo>+</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>u</mi> <mrow> <mi>C</mi> <mi>d</mi> <mi>c</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>/</mo> <mn>3</mn> <mi>N</mi> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
    (3.2) by mean direct voltage value of feedback udc_avWith desired DC voltage value udcrIt is compared, is obtained through PI controllers The d components u of current transformer output voltagecd, by fundamental reactive component of the output current of chain type active filter under dq coordinate systems iqfbWith benchmark reactive current component iqrIt is compared, the q components u of current transformer output voltage is obtained through PI controllerscq, then pass through Current indirect control can obtain idle under abc coordinate systems and real power control command voltage upq；
    (3.3) by idle and real power control command voltage upqWith harmonic absorption command voltage uhrSuperposition, is then obtained under abc coordinates Three-phase modulations voltage command signal ur。
  9. 9. the control method of hybrid active electric filter according to claim 8, it is characterised in that including DC voltage Balance control, it is the step of voltage balance control：
    (4.1) by i-th of converter module DC voltage feedback signal U of ABC three-phasesAdc_i、UBdc_i、UCdc_iRespectively with three-phase Chain type current transformer mean direct voltage Udc_avSubtract each other, error amount is exported into feedback current i with ABC three-phases respectivelyoA、ioB、ioCIt is multiplied Each i-th of module modulation voltage increment U of phase is obtained after pi regulator△Ai、U△Bi、U△Ci；
    (4.2) each phase voltage modulation a reference value UAr、UBr、UCr, with each i-th of module modulation voltage increment U of phase△Ai、U△Bi、U△Ci Addition obtains, the final modulated signal U of i-th of module of each phaseAri、UBri、UCri。
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