CN103812107A - Compound control based hybrid cascading seven-level active filter - Google Patents
Compound control based hybrid cascading seven-level active filter Download PDFInfo
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Abstract
The invention discloses a compound control based hybrid cascading seven-level active filter. The compound control based hybrid cascading seven-level active filter comprises an H-bridge hybrid cascading main circuit (3), a sampling circuit (4), a control circuit (5), and a pulse width modulation (PWM) and isolation drive circuit (6), wherein the ratio of the DC side voltages of two H-bridge units in the H-bridge hybrid cascading main circuit (3) is 1: 2, the control circuit (5) comprises a main power signal generation module (7), a power compensation signal generation module (8), and a compound control module (9), the main power signal generation module (7) generates a main control signal, the power compensation signal generation module (8) generates a power compensation signal, the compound control module (9) is used for generating a first control signal and a second control signal, and the PWM and isolation drive circuit (6) is used for generating a final switch tube drive signal. Compared with traditional isobaric cascading active filters, the compound control based hybrid cascading seven-level active filter can output more levels under the same number of units, so that effects of harmonic compensation are improved.
Description
Technical field
The present invention relates to a kind of Mixed cascading seven level active filters based on compound control, be applicable to various middle and high power occasions, belong to power harmonic suppression technical field.
Background technology
In recent years, power electronic technology and device have obtained develop rapidly, improving in people's living standard, have also brought a large amount of nonlinear loads to electrical network, particularly with the current transformer of switch mode operation.These nonlinear loads will produce a large amount of humorous involve idle, if injection electrical network, will make power network current and line voltage produce distortion, in serious situation, may threaten the safe operation of electrical network, therefore the inhibition of harmonic wave with administer most importantly, be the important research topic in field such as power electronics in the last few years.
Active filter is a kind ofly can dynamically suppress the humorous device that involves compensating reactive power, has that dynamic response is fast, reliability is high, compensate the advantages such as flexible, has good application prospect, enjoys people to favor and concern.Along with social development, power electronic technology strides forward to high-power occasion gradually, and the problem that first will solve this is the contradiction between switching device frequency height and watt level.Following period of time in the past, many level Semiconductor Converting Technology has obtained good research and development in the application of high-power occasion, many level topology can realize withstand voltage low high frequency switching device is applied directly to high-power occasion, and many level topology also has the advantages such as harmonic wave of output voltage is few, electromagnetic interference is little simultaneously.
In the last few years, the development of many level topology was maked rapid progress.Aburto V, Schneider M, and Moran L, " An active power filter implemented with a three-level NPC voltage-source inverter, " IEEE PESC, first 1997:1121-1126 is applied to many level of diode-clamped topology in Active Power Filter-APF, this topology can reduce switch tube voltage stress effectively, improve compensation effect, but along with increasing of level number, switching device quantity sharply increases, this will increase volume and the cost of system, in addition also there is electric voltage equalization problem in this topology, more complicated on controlling.J.S.Lai and F.Z.Peng, " Multilevel converters-A new breed of power converters, " IEEE Transactions on Industry Applications, 1996, 32 (3): 2348-2356 has proposed the inverter topology of isobaric H bridge cascade, if this topological structure is applied in active filter and can increases output level number, improve compensation effect, and can be applied in high-power occasion, but when required level number increases, cascade unit number also can increase greatly, this will make system and control become more complicated.How to adopt identical cascade unit number to export more level, there is practical significance to improving better compensation effect.For this problem Miguel Lopez G, Luis Moran T, and Jose Espinoza C, et al, " Performance analysis of a hybrid asymmetric multilevel inverter for high voltage active power filter applications, " IEEE IECON, many level of H bridge Mixed cascading topology that 2003:1050-1055 is binary system relation by a kind of DC voltage is applied in Active Power Filter-APF, this topology can be exported more level under same stages joins cell cases, compensation effect is better.
The control of many level actives of Mixed cascading filter is most important, how to be that the emphasis of studying is also difficult point guaranteeing that DC-side Voltage Stabilization is obtained good compensation effect under the prerequisite of determined mixing ratio.Most methods for be the control of isobaric H bridge cascade and less to the research of Mixed cascading control, as adopt the stable of additional firmware device control DC voltage, although this method can be by DC-side Voltage Stabilization at desirable value, meanwhile also increase cost and the volume of system; Also can adopt output waveform phase shift is controlled to DC-side Voltage Stabilization, but because phase shifting angle is limited in scope, cause H bridge DC side voltage stabilization slower, dynamic property is poor.Manjrekar M D, Steimer P K, and Lipo T A, " Hybrid multilevel power conversion system:a competitive solution for hign-power applications, " IEEE Transactions on Industry Applications, 2000, 36 (3): 834-841 proposes to adopt the PWM rectifier of full-control type power device composition to control the stable of low voltage unit DC voltage for Mixed cascading topology, this will increase the complexity of system control, the efficiency of reduction system, the volume of increase system and cost.Miguel Lopez G, Luis Moran T, and Jose Espinoza C, et al, " Performance analysis of a hybrid asymmetric multilevel inverter for high voltage active power filterapplications; " IEEE IECON, 2003:1050-1055 does not adopt additional equipment, but by a kind of mixing control method, system is controlled, the method has obtained certain compensation effect, but the dynamic property of article during not to load changing analyzed, and reliability is not high.
Therefore, how not increase under the prerequisite of system cost and complexity, making Mixed cascading seven level active filters obtain good sound state compensation effect and the requirement that meets high reliability has important Research Significance.
Summary of the invention
Goal of the invention:
The object of the invention is to propose a kind of Mixed cascading seven level active filters based on compound control, wherein many level of Mixed cascading topology can suppress better electric harmonic and can be applicable to mesohigh large-power occasions, for the feature of this topology self, the present invention proposes a kind of method of compound control, this control method not only can be controlled each unit DC-side Voltage Stabilization at set-point, and can obtain good sound state compensation effect, can make the highly reliable operation of system.
Technical scheme:
The present invention is by the following technical solutions:
Mixed cascading seven level active filters based on compound control, comprise H bridge Mixed cascading main circuit, sample circuit, control circuit and PWM modulation and isolated drive circuit; The input of described H bridge Mixed cascading main circuit is connected with one end of AC network positive bus-bar, nonlinear load respectively, its output is connected with the other end of AC network negative busbar, nonlinear load respectively, the input of sample circuit is connected with H bridge Mixed cascading main circuit, AC network lateral circuit respectively, for gathering the sampled value of voltage, electric current; Control circuit comprises main power signal generation module, power compensation signal generation module and compound control module; Wherein the first input end of the input of main power signal generation module, power compensation signal generation module is connected with the output of sample circuit respectively; The first output of main power signal generation module is connected with the second input of power compensation signal generation module, and the second output of main power signal generation module, the output of power compensation signal generation module are connected with first, second input of compound control module respectively; The output of compound control module is connected with the input of isolated drive circuit with PWM modulation; PWM modulation is connected with H bridge Mixed cascading main circuit with the output of isolated drive circuit;
Described H bridge Mixed cascading main circuit comprises AC interface inductance L and two H bridge unit, and wherein two H bridge unit adopt Mixed cascading structure, are respectively low voltage unit H
1with high voltage unit H
2, and DC voltage mixing ratio is 1: 2;
Described sample circuit comprises ac grid voltage sampling VT1, low voltage unit DC voltage sampling VT2, high voltage unit DC voltage sampling VT3 and power network current sampling CT1, offset current sampling CT2; The sampled value u of wherein said ac grid voltage sampling VT1
s, power network current sampling CT1 sampled value i
sinput to main power signal generation module; The sampled value u of described low voltage unit DC voltage sampling VT2
1, high voltage unit DC voltage sampling VT3 sampled value u
2input to respectively main power signal generation module, power compensation signal generation module simultaneously; The sampled value i of described offset current sampling CT2
cinput to power compensation signal generation module.
Further, the main power signal generation module of above-mentioned a kind of Mixed cascading seven level active filters based on compound control is used for producing main control signal, and its process is as follows: by VT2 low voltage unit DC voltage sampled value u
1with VT3 high voltage unit DC voltage sampled value u
2obtain the DC side total voltage U of two-stage receipts or other documents in duplicate unit as overlap-add procedure
dc, by itself and given voltage reference U
dc *make comparisons, error signal is sent into voltage controller 1 and is obtained power network current reference signal i
s *amplitude signal I
s; VT1 line voltage sampled value u
safter phase-locked loop pll is phase-locked, produce and the sinusoidal signal e of the synchronous standard unit of line voltage
s, then by the sinusoidal signal e of this standard unit
soutput I with voltage controller 1
smultiply each other and obtain power network current reference signal i
s *; CT1 power network current sampled value i
swith power network current reference signal i
s *make comparisons, difference can obtain main control signal p by current controller
m.
Further, the power compensation signal generation module of above-mentioned a kind of Mixed cascading seven level active filters based on compound control is used for producing power compensation signal, comprises the following steps: detect offset current i by Current Transmit 2
c; According to the DC side total voltage U of two-stage receipts or other documents in duplicate unit
dcdraw respectively low voltage unit and high voltage unit DC voltage reference value with cascade unit DC voltage mixing ratio, then by two DC voltage reference values respectively with the sampled value u of low voltage unit DC voltage and high voltage unit DC voltage
1and u
2make comparisons, comparative result is sent into respectively voltage controller 2 and voltage controller 3 and obtains the voltage compensation signal Δ u of low voltage unit and high voltage unit
1with Δ u
2; By two voltage compensation signal respectively with offset current i
cmultiply each other, result is Δ p
1with Δ p
2, i.e. power compensation signal 1 and power compensation signal 2.
Further, the compound control module of above-mentioned a kind of Mixed cascading seven level active filters based on compound control is used for producing the first control signal and the second control signal, specific as follows: by main control signal p
madjust accordingly with computing and obtain p
m1(p
m1=k
1p
m) and p
m2(p
m2=k
2p
m) be main control signal 1 and main control signal 2; Main control signal 1 and power compensation signal 1 addition are obtained to the first control signal p
1, main control signal 2 and power compensation signal 2 additions are obtained to the second control signal p
2.
By the first control signal p
1with the second control signal p
2send into the driving signal that PWM modulation and isolated drive circuit can obtain the each switching tube of two-stage receipts or other documents in duplicate unit.
Beneficial effect:
1, active filter topology of the present invention adopts two H bridge Mixed cascading structures, there is isobaric H bridge cascade structure, in addition, this topology is compared with isobaric H bridge cascaded topology, in same stages connection unit number situation, can export more level, be conducive to reduce output harmonic wave content, improve compensation effect;
2, the compound control module of the present invention combines main power signal generation module and power compensation signal generation module, according to actual conditions, by the adjustment to coefficient and optimization, can for providing corresponding power compensation, two-stage receipts or other documents in duplicate unit DC side guarantee the stable of two-stage receipts or other documents in duplicate unit DC voltage with this in real time, in the time of load changing, this control method also can regulate two-stage receipts or other documents in duplicate unit DC side power back-off amount rapidly, thereby makes DC voltage quickly recover to stable state.This control method can guarantee that system has good sound state compensation performance on the one hand, and this control method has good adaptive capacity to some uncertain factors on the other hand, has greatly improved the reliability of system.
Accompanying drawing explanation
Fig. 1 is the structure chart of a kind of Mixed cascading seven level active filters based on compound control of the present invention.
Fig. 2 is main circuit and the control principle drawing of a kind of Mixed cascading seven level active filters based on compound control of the present invention.
Fig. 3 is line voltage, power network current, load current, offset current and the bucking voltage simulation waveform that the present invention is applied to 220V/50Hz electrical network.
Fig. 4 is low voltage unit DC voltage and the high voltage unit DC voltage static Simulation waveform that the present invention is applied to 220V/50Hz electrical network.
Fig. 5 is power network current, offset current and the two-stage receipts or other documents in duplicate unit's DC voltage dynamic simulation waveform in the time that impact carries that the present invention is applied to 220V/50Hz electrical network.
Number in the figure: 1, AC network, 2, nonlinear load, 3, H bridge Mixed cascading main circuit, 4, sample circuit, 5, control circuit, 6, PWM modulation and isolated drive circuit, 7, main power signal generation module, 8, power compensation signal generation module, 9, compound control module.
Specific embodiments
Below in conjunction with accompanying drawing, the enforcement of technical scheme is described in further detail:
Fig. 1 is the structure chart of a kind of Mixed cascading seven level active filters based on compound control of the present invention.As shown in Figure 1, active filter of the present invention comprises H bridge Mixed cascading main circuit 3, sample circuit 4, control circuit 5 and PWM modulation and isolated drive circuit 6; Described H bridge Mixed cascading main circuit 3 is connected with AC network 1 and nonlinear load 2, and the input of sample circuit 4 is connected with H bridge Mixed cascading main circuit 3, AC network 1 lateral circuit respectively, for gathering the sampled value of voltage, electric current; Control circuit 5 comprises main power signal generation module 7, power compensation signal generation module 8 and compound control module 9; Wherein the first input end of the input of main power signal generation module 7, power compensation signal generation module 8 is connected with the output of sample circuit 4 respectively; The first output of main power signal generation module 7 is connected with the second input of power compensation signal generation module 8, and the second output of main power signal generation module 7, the output of power compensation signal generation module 8 are connected with first, second input of compound control module 9 respectively; The output of compound control module 9 is connected with the input of isolated drive circuit 6 with PWM modulation; PWM modulation is connected with H bridge Mixed cascading main circuit 3 with the output of isolated drive circuit 6.
Fig. 2 is main circuit and the control principle drawing of a kind of Mixed cascading seven level active filters based on compound control of the present invention.As shown in Figure 2, system is made up of AC network 1, nonlinear load 2, H bridge Mixed cascading main circuit 3, wherein AC network 1 is sent alternating voltage, nonlinear load 2 is current mode harmonic source, produce harmonic current, H bridge Mixed cascading main circuit 3 is made up of AC interface inductance L and two H bridge unit, and wherein two H bridge unit adopt Mixed cascading structure, are respectively low voltage unit H
1with high voltage unit H
2, two unit DC voltage mixing ratios are 1: 2, the input of two-stage receipts or other documents in duplicate unit is by interface inductance L incoming transport electrical network 1 positive bus-bar and nonlinear load 2 one end, direct incoming transport electrical network 1 negative busbar of its output and nonlinear load 2 other ends.Sample circuit 4 comprises ac grid voltage sampling VT1, low voltage unit DC voltage sampling VT2, high voltage unit DC voltage sampling VT3 and power network current sampling CT1, offset current sampling CT2.Control circuit 5 comprises main power signal generation module 7, power compensation signal generation module 8 and compound control module 9, and the sampled value that main power signal generation module 7 is input as VT1, VT2, VT3 and CT1 is u
s, u
1, u
2and i
s, be output as DC side total voltage signal and main control signal, respectively access power compensating signal generation module 8 and compound control module 9; The sampled value that power compensation signal generation module 8 is input as VT2, VT3 and CT2 is u
1, u
2and i
c, be output as power compensation signal 1 and power compensation signal 2, access compound control module 9; Compound control module 9 is input as two power compensation signals that main control signal that main power signal generation module 7 exports and power compensation signal generation module 8 are exported, and is output as the first control signal and the second control signal, access PWM modulation and isolated drive circuit 6; PWM modulation is input as with isolated drive circuit 6 two control signals that compound control module 9 is exported, and is output as the driving signal of the each switching tube of two H bridges, access H bridge Mixed cascading main circuit 3.
In main power signal generation module 7, by VT2 low voltage unit DC voltage sampled value u
1with VT3 high voltage unit DC voltage sampled value u
2as adder B
1two inputs, adder B
1be output as the DC side total voltage U of two-stage receipts or other documents in duplicate unit
dc, and set it as subtracter B
2negative input, by voltage reference U
dc *as subtracter B
2positive input, subtracter B
2output as the input of voltage controller 1, the output of voltage controller 1 is power network current reference signal i
s *amplitude signal I
s, set it as multiplier M
1an input, VT1 line voltage sampled value u
sinput phase-locked loop pll obtains the sinusoidal signal e with the synchronous standard unit of line voltage
sbe i
s *phase information, set it as multiplier M
1another input, multiplier M
1output be power network current reference signal i
s *, as subtracter B
3positive input, CT1 power network current sampled value i
sas subtracter B
3negative input, subtracter B
3output as the input of current controller, current controller is output as main control signal p
m.
In power compensation signal generation module 8, by adder B in main power signal generation module 7
1output U
dcpassing ratio link k
3(two-stage receipts or other documents in duplicate unit DC voltage mixing ratio is 1: 2, gets k here
3=1/3), proportional component k
3output and low voltage unit DC voltage u
1as subtracter B
4negative positive input, subtracter B
4output as the input of voltage controller 2, voltage controller 2 is output as low voltage unit voltage compensation signal Δ u
1; By adder B in main power signal generation module 7
1output U
dcpassing ratio link k
4(be 1: 2 according to two-stage receipts or other documents in duplicate unit DC voltage mixing ratio, get k here
4=2/3), proportional component k
4output and high voltage unit DC voltage u
2as subtracter B
5negative positive input, subtracter B
5output as the input of voltage controller 3, the output of voltage controller 3 is high voltage unit voltage compensation signal Δ u
2; By CT2 offset current sampled value i
coutput Δ u with voltage controller 2
1as multiplier M
2two inputs, multiplier M
2be output as Δ p
1be power compensation signal 1, by i
coutput Δ u with voltage controller 3
2as multiplier M
3two inputs, multiplier M
3be output as Δ p
2it is power compensation signal 2.
In compound control module 9, main power signal generation module 7 is exported respectively as proportional component k
1with proportional component k
2input, proportional component k
1be output as p
m1be main control signal 1, proportional component k
2be output as p
m2it is main control signal 2; Main control signal p
m1with multiplier M in power compensation signal generation module 8
2output Δ p
1as adder B
6two inputs, adder B
6be output as p
1i.e. the first control signal, main control signal p
m2with multiplier M in power compensation signal generation module 8
3output Δ p
2as adder B
7two inputs, adder B
7be output as p
2i.e. the second control signal.
The present invention the first control signal p
1with the second control signal p
2obtain by main control signal and power compensation signal and obtain by ranking operation, its expression formula can be expressed as:
p
1＝k
1p
m+Δp
1 (1)
p
2＝k
2p
m+Δp
2 (2)
Wherein k
1and k
2for adjustable amount, can find out from (1) formula and (2) formula, in the time that two-stage receipts or other documents in duplicate unit DC voltage departs from set-point, as required to weight coefficient k
1and k
2adjust accordingly, can change power compensation signal shared ratio in the first and second control signals, thereby change the power back-off amount to each DC side, can make on the one hand two-stage receipts or other documents in duplicate unit DC voltage quickly recover to set-point, can avoid by the further optimization to coefficient the fluctuation that DC voltage is larger on the other hand, prevent overtension and damage power tube; In the time of load changing, same by can make filter recover at short notice normally to the suitable processing of weight coefficient, therefore, active filter of the present invention has stronger adaptive capacity to load and has good sound state compensation performance.
By the first control signal p
1with the second control signal p
2send into PWM modulation and isolated drive circuit 6 and get final product to obtain the driving signal of low voltage unit and the each switching tube of high voltage unit.
The compound control of the present invention is in fact the control method of main control signal and power compensation signal co-ordination, according to different operating states and actual conditions, each signal is carried out optimizing flexibly and processing.In the time of filter steady operation, power compensation signal is very little on the impact of system; When two-stage receipts or other documents in duplicate unit DC voltage occurs departing from or when load changing, this etching system is by unstable, power compensation signal will display the effect of system, by weight coefficient k
1and k
2optimization choose and design, adjust the active power of the required compensation of each unit DC side, make the fast quick-recovery of system stable, therefore, system has stronger adaptive load ability and good sound state compensation performance, reliability improves.
Under MATLAB software environment, the present invention has set up simulation model and waveform has been analyzed.Simulation parameter is as follows: line voltage is 220V/50Hz, and nonlinear load is the single-phase rectification bridge joint resistance sense load (20 Ω, 500mH) of not controlling, and APF AC interface inductance L is 1.2mH, and active filter DC side total voltage is 390V (u
1: u
2=1: 2), two-stage receipts or other documents in duplicate unit DC bus capacitor capacitance is 1000 μ F, and triangular carrier frequency is 20kHz.
Fig. 3 is line voltage, power network current, load current, offset current and the bucking voltage simulation waveform that the present invention is applied to 220V/50Hz electrical network.As can be seen from the figure power network current does not almost distort, phase place is synchronizeed with line voltage, bucking voltage is seven level, and simulation result shows: Mixed cascading seven level active filters have been obtained good compensation effect, have proved validity and the feasibility of control method of the present invention.
Fig. 4 is low voltage unit DC voltage and the high voltage unit DC voltage static Simulation waveform that the present invention is applied to 220V/50Hz electrical network.As can be seen from the figure two-stage receipts or other documents in duplicate unit DC voltage ratio is 1: 2 and is stabilized in set-point, this shows that control method of the present invention can be used for controlling different voltage cell Mixed cascading active filters.
Fig. 5 is power network current, offset current and the two-stage receipts or other documents in duplicate unit's DC voltage dynamic simulation waveform in the time that impact carries that the present invention is applied to 220V/50Hz electrical network.Can find out from simulation waveform, in the time of load impact, power network current recovers stable state again only needs one-period, DC voltage fluctuation is very little and can return to very soon stationary value, simulation result shows: control method of the present invention can make system have good dynamic property, the variation of load is had to stronger adaptive capacity, and reliability is higher.
Claims (3)
1. the Mixed cascading seven level active filters based on compound control, comprise H bridge Mixed cascading main circuit (3), sample circuit (4), control circuit (5) and PWM modulation and isolated drive circuit (6); The input of described H bridge Mixed cascading main circuit (3) is connected with one end of AC network (1) positive bus-bar, nonlinear load (2) respectively, its output is connected with the other end of AC network (1) negative busbar, nonlinear load (2) respectively, the input of sample circuit (4) is connected with H bridge Mixed cascading main circuit (3), AC network (1) lateral circuit respectively, for gathering the sampled value of voltage, electric current; It is characterized in that: described control circuit (5) comprises main power signal generation module (7), power compensation signal generation module (8) and compound control module (9); Wherein the first input end of the input of main power signal generation module (7), power compensation signal generation module (8) is connected with the output of sample circuit (4) respectively; The first output of main power signal generation module (7) is connected with the second input of power compensation signal generation module (8), and the second output of main power signal generation module (7), the output of power compensation signal generation module (8) are connected with first, second input of compound control module (9) respectively; The output of compound control module (9) is connected with the input of isolated drive circuit (6) with PWM modulation; PWM modulation is connected with H bridge Mixed cascading main circuit (3) with the output of isolated drive circuit (6);
Described H bridge Mixed cascading main circuit (3) comprises AC interface inductance L and two H bridge unit, and wherein two H bridge unit adopt Mixed cascading structure, are respectively low voltage unit H
1with high voltage unit H
2, and DC voltage mixing ratio is 1: 2;
Described sample circuit (4) comprises ac grid voltage sampling VT1, low voltage unit DC voltage sampling VT2, high voltage unit DC voltage sampling VT3 and power network current sampling CT1, offset current sampling CT2; The sampled value u of wherein said ac grid voltage sampling VT1
s, power network current sampling CT1 sampled value i
sinput to main power signal generation module (7); The sampled value u of described low voltage unit DC voltage sampling VT2
1, high voltage unit DC voltage sampling VT3 sampled value u
2input to respectively main power signal generation module (7), power compensation signal generation module (8) simultaneously; The sampled value i of described offset current sampling CT2
cinput to power compensation signal generation module (8).
2. a kind of Mixed cascading seven level active filters based on compound control according to claim 1, it is characterized in that, described main power signal generation module (7) is used for producing main control signal, power compensation signal generation module (8) is used for producing power compensation signal, and concrete steps are as follows:
Steps A, by VT2 low voltage unit DC voltage sampled value u
1with VT3 high voltage unit DC voltage sampled value u
2obtain the DC side total voltage U of two-stage receipts or other documents in duplicate unit as overlap-add procedure
dc, then by itself and voltage reference U
dc *make comparisons, comparative result is sent into voltage controller 1 can obtain an amplitude signal I
s;
Step B, the sampled value u of VT1 line voltage
ssend into phase-locked loop pll can with the sinusoidal signal e of the synchronous standard unit of line voltage
s, by the sinusoidal signal e of this standard unit
swith the amplitude signal I obtaining in steps A
smultiply each other, result is power network current reference signal i
s *;
Step C, it is the sampled value i of CT1 that actual electric network electric current is sampled
s, the power network current reference signal i obtaining in calculation procedure B
s *with CT1 power network current sampled value i
sdifference, it can be obtained to main control signal p by current controller
m;
Step D, detects offset current i by Current Transmit 2
c;
Step e, according to the DC side total voltage U of two-stage receipts or other documents in duplicate unit
dcdraw low voltage unit DC voltage reference value with cascade unit DC voltage mixing ratio, then with low voltage unit DC voltage sampled value u
1make comparisons, result is relatively sent into voltage controller 2 and can be obtained low voltage unit voltage compensation signal Δ u
1;
Step F, calculates low voltage unit voltage compensation signal Δ u
1with offset current i
cproduct, result is Δ p
1it is power compensation signal 1;
Step G, according to the DC side total voltage U of two-stage receipts or other documents in duplicate unit
dcdraw high voltage unit DC voltage reference value with cascade unit DC voltage mixing ratio, then with high voltage unit DC voltage sampled value u
2make comparisons, result is relatively sent into voltage controller 3 and can be obtained high voltage unit voltage compensation signal Δ u
2;
Step H, calculates high voltage unit voltage compensation signal Δ u
2with offset current i
cproduct, result is Δ p
2it is power compensation signal 2.
3. a kind of Mixed cascading seven level active filters based on compound control according to claim 1, is characterized in that, described compound control module (9) is used for producing the first control signal and the second control signal, and concrete steps are as follows:
Steps A, by main control signal p
mcarry out corresponding adjustment with calculation process and obtain p
m1(p
m1=k
1p
m) and p
m2(p
m2=k
2p
m) be main control signal 1 and main control signal 2, wherein k
1and k
2for adjustable amount;
Step B, main control signal and power compensation signal are coordinated mutually, and main control signal 1 and power compensation signal 1 are obtained to the first control signal p as overlap-add procedure
1, main control signal 2 and power compensation signal 2 are obtained to the second control signal p as overlap-add procedure
2.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111371335A (en) * | 2019-05-08 | 2020-07-03 | 上海电机学院 | Eight-switch seven-level active power filter and control method thereof |
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| US7710082B2 (en) * | 2007-10-18 | 2010-05-04 | Instituto Potosino De Investigacion Cientifica Y Technologica (Ipicyt) | Controller for the three-phase cascade multilevel converter used as shunt active filter in unbalanced operation with guaranteed capacitors voltages balance |
| CN102570472A (en) * | 2010-12-07 | 2012-07-11 | 吉林省电力有限公司四平供电公司 | Comprehensive compensation control device for effectively improving power quality |
| CN103401454A (en) * | 2013-08-13 | 2013-11-20 | 陈仲 | Class unipolarity modulation method suitable for mixed cascade seven-level inverter |
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