CN103812107B - A kind of Mixed cascading seven level active filter based on complex controll - Google Patents
A kind of Mixed cascading seven level active filter based on complex controll Download PDFInfo
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Abstract
The invention discloses a kind of Mixed cascading seven level active filter based on complex controll.The present invention includes H bridge Mixed cascading main circuit (3), sample circuit (4), control circuit (5) and PWM and isolated drive circuit (6); In H bridge Mixed cascading main circuit (3), two H-bridge unit DC voltages are than being 1:2; Control circuit (5) comprises main power signal generation module (7), power compensation signal generation module (8), complex controll module (9); Main power signal generation module (7) produces main control signal, and power compensation signal generation module (8) produces power compensation signal, and complex controll module (9) is used for generation first control signal and the second control signal; PWM and isolated drive circuit (6) produce final switching tube drive singal.The present invention, compared with the isobaric cascade active filter of tradition, can export more level when same unit number, improve the effect of harmonic compensation.
Description
Technical field
The present invention relates to a kind of Mixed cascading seven level active filter based on complex controll, be applicable to various middle and high power occasion, belong to power harmonic suppression technical field.
Background technology
In recent years, power electronic technology and device obtain develop rapidly, while raising people's living standard, also bring 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, power network current and line voltage will be made to produce distortion, the safe operation of electrical network may be threatened under serious conditions, therefore harmonic wave suppression with administer most important, be the research topic that the field such as power electronics is important in the last few years.
Active filter be a kind of can the device of dynamic harmonic wave and compensating reactive power, have that dynamic response is fast, reliability is high, compensate the advantages such as flexible, there is good application prospect, enjoy people to favor and concern.Along with the development of society, 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 obtains good research and development in the application of high-power occasion, many level topologys can realize the resistance to high frequency switching device forced down to be 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.AburtoV, SchneiderM, andMoranL, " Anactivepowerfilterimplementedwithathree-levelNPCvoltage-sourceinverter, " IEEEPESC, first diode-clamped many level topology is applied in Active Power Filter-APF by 1997:1121-1126, 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 in control.J.S.LaiandF.Z.Peng, " Multilevelconverters-Anewbreedofpowerconverters; " IEEETransactionsonIndustryApplications, 1996,32 (3): the 2348-2356 inverter topologies proposing the cascade of isobaric H bridge, if this topological structure is applied in active filter and can increases output level number, improve compensation effect, and high-power occasion can be applied in, but when required level number increases, concatenation unit number also can increase greatly, and this will make system and control become more complicated.How adopting identical concatenation unit number to export more level, to improving compensation effect better, there is practical significance.For this problem MiguelLopezG, LuisMoranT, andJoseEspinozaC, etal, " Performanceanalysisofahybridasymmetricmultilevelinverter forhighvoltageactivepowerfilterapplications; " IEEEIECON, a kind of DC voltage is that H bridge Mixed cascading many level topology of binary relationship is applied in Active Power Filter-APF by 2003:1050-1055, this topology can export more level in identical concatenation unit situation, and compensation effect is better.
The control of Mixed cascading many level actives filter is most important, how is ensureing DC-side Voltage Stabilization under the prerequisite of determine mixing ratio, obtain good compensation effect be the emphasis studied also to be difficult point.Most methods for be the cascade of isobaric H bridge control and to Mixed cascading control research less, the stable of DC voltage is controlled as adopted additional firmware device, although this method by DC-side Voltage Stabilization at desirable value, can meanwhile too increase cost and the volume of system; Also can adopt by output waveform phase shift to control DC-side Voltage Stabilization, but be limited in scope due to phase shifting angle, cause H bridge DC side voltage stabilization comparatively slow, dynamic property is poor.ManjrekarMD, SteimerPK, andLipoTA, " Hybridmultilevelpowerconversionsystem:acompetitivesoluti onforhign-powerapplications; " IEEETransactionsonIndustryApplications, 2000,36 (3): 834-841 propose 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 Systematical control, the efficiency of reduction system, increases volume and the cost of system.MiguelLopezG, LuisMoranT, andJoseEspinozaC, etal, " Performanceanalysisofahybridasymmetricmultilevelinverter forhighvoltageactivepowerfilterapplications; " IEEEIECON, 2003:1050-1055 does not adopt additional equipment, but by a kind of mixing control method, system is controlled, the method achieves certain compensation effect, but article is not analyzed dynamic property during load changing, reliability is not high.
Therefore, how under the prerequisite not increasing system cost and complexity, make Mixed cascading seven level active filter obtain good sound state compensation effect and the requirement meeting 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 filter based on complex controll, wherein Mixed cascading many level topology can suppress electric harmonic better 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 complex controll, this control method can not only control each unit DC-side Voltage Stabilization at set-point, and good sound state compensation effect can be obtained, the highly reliable operation of system can be made.
Technical scheme:
The present invention is by the following technical solutions:
Based on a Mixed cascading seven level active filter for complex controll, comprise H bridge Mixed cascading main circuit, sample circuit, control circuit and PWM 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 complex controll module; Wherein the input of main power signal generation module, the first input end of power compensation signal generation module are connected with the output of sample circuit respectively; 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 complex controll module respectively; The output of complex controll module is connected with the input of isolated drive circuit with PWM; PWM 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 main power signal generation module, power compensation signal generation module respectively 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 filter based on complex controll 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
2two concatenation unit DC side total voltage U are obtained 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 synchronous standard unit sinusoidal signal e of line voltage
s, then by this standard unit sinusoidal signal e
swith the output I of voltage controller 1
sbe multiplied 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 filter based on complex controll is used for producing power compensation signal, comprises the following steps: detect offset current i by Current Transmit 2
c; According to two concatenation unit DC side total voltage U
dcdraw low voltage unit and high voltage unit DC voltage reference value respectively with concatenation 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 sends into the voltage compensation signal Δ u that voltage controller 2 and voltage controller 3 obtain low voltage unit and high voltage unit respectively
1with Δ u
2; By two voltage compensation signal respectively with offset current i
cbe multiplied, result is Δ p
1with Δ p
2, i.e. power compensation signal 1 and power compensation signal 2.
Further, the complex controll module of above-mentioned a kind of Mixed cascading seven level active filter based on complex controll is used for generation first control signal and the second control signal, specific as follows: by main control signal p
madjust accordingly and obtain p with computing
m1(p
m1=k
1p
m) and p
m2(p
m2=k
2p
m) i.e. main control signal 1 and main control signal 2; Main control signal 1 and power compensation signal 1 are added and obtain the first control signal p
1, main control signal 2 and power compensation signal 2 are added and obtain the second control signal p
2.
By the first control signal p
1with the second control signal p
2feeding PWM and isolated drive circuit can obtain the drive singal of each switching tube of two concatenation unit.
Beneficial effect:
1, active filter topology of the present invention adopts two H bridge Mixed cascading structures, there is the advantage of isobaric H bridge cascade structure, in addition, this topology is compared with isobaric H bridge cascaded topology, more level can be exported in identical concatenation unit number situation, be conducive to reducing output harmonic wave content, improve compensation effect;
2, complex controll module synthesis of the present invention main power signal generation module and power compensation signal generation module, according to actual conditions, by the adjustment and optimisation to coefficient, the stable of two concatenation unit DC voltages can be ensured with this in real time for two concatenation unit DC side provide corresponding power to compensate, when load changing, this control method also can regulate two concatenation unit DC side power back-off amounts rapidly, thus makes DC voltage quickly recover to stable state.This control method can ensure 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, substantially increases the reliability of system.
Accompanying drawing explanation
Fig. 1 is the structure chart of a kind of Mixed cascading seven level active filter based on complex controll of the present invention.
Fig. 2 is main circuit and the control principle drawing of a kind of Mixed cascading seven level active filter based on complex controll of the present invention.
Fig. 3 is that the present invention is applied to the line voltage of 220V/50Hz electrical network, power network current, load current, offset current and bucking voltage simulation waveform.
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 that the present invention is applied to the power network current of 220V/50Hz electrical network, offset current and two concatenation unit DC voltages dynamic simulation waveform when impact carries.
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 and isolated drive circuit, 7, main power signal generation module, 8, power compensation signal generation module, 9, complex controll module.
Specific embodiments
Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical scheme:
Fig. 1 is the structure chart of a kind of Mixed cascading seven level active filter based on complex controll 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 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 complex controll module 9; Wherein the input of main power signal generation module 7, the first input end of power compensation signal generation module 8 are connected with the output of sample circuit 4 respectively; 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 complex controll module 9 respectively; The output of complex controll module 9 is connected with the input of PWM with isolated drive circuit 6; PWM 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 filter based on complex controll 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 sends 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 that the input of 1: 2, two concatenation unit is by interface inductance L incoming transport electrical network 1 positive bus-bar and nonlinear load 2 one end, its output direct incoming transport electrical network 1 negative busbar and nonlinear load 2 other end.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 complex controll module 9, and main power signal generation module 7 is input as sampled value and the u of VT1, VT2, VT3 and CT1
s, u
1, u
2and i
s, export as DC side total voltage signal and main control signal, respectively access power compensating signal generation module 8 and complex controll module 9; Power compensation signal generation module 8 is input as sampled value and the u of VT2, VT3 and CT2
1, u
2and i
c, export as power compensation signal 1 and power compensation signal 2, access complex controll module 9; Complex controll module 9 is input as the main control signal of main power signal generation module 7 output and two power compensation signals of power compensation signal generation module 8 output, and output is the first control signal and the second control signal, access PWM and isolated drive circuit 6; PWM and isolated drive circuit 6 are input as two control signals that complex controll module 9 exports, and output is the drive singal of 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
1output be two concatenation unit DC side total voltage U
dc, and it can be used 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, it can be used as multiplier M
1an input, VT1 line voltage sampled value u
sinput phase-locked loop pll obtains the synchronous standard unit sinusoidal signal e with line voltage
si.e. i
s *phase information, it can be used 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, the output of current controller is 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 concatenation unit DC voltage mixing ratios are 1: 2, get 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, the output of voltage controller 2 is 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 concatenation unit DC voltage mixing ratios, 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
cwith the output Δ u of voltage controller 2
1as multiplier M
2two inputs, multiplier M
2output be Δ p
1i.e. power compensation signal 1, by i
cwith the output Δ u of voltage controller 3
2as multiplier M
3two inputs, multiplier M
3output be Δ p
2i.e. power compensation signal 2.
In complex controll module 9, main power signal generation module 7 is exported as proportional component k
1with proportional component k
2input, proportional component k
1output be p
m1i.e. main control signal 1, proportional component k
2output be p
m2i.e. 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
6output be 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
7output be p
2i.e. the second control signal.
The present invention first control signal p
1with the second control signal p
2acquisition obtained by ranking operation by main control signal and power compensation signal, 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, as can be seen from (1) formula and (2) formula, when two concatenation unit DC voltages depart from set-point, as required to weight coefficient k
1and k
2adjust accordingly, the ratio that power compensation signal is shared in the first and second control signals can be changed, thus the power back-off amount changed each DC side, two concatenation unit DC voltages can be made to quickly recover to set-point on the one hand, on the other hand by avoiding to the further optimization of coefficient the fluctuation that DC voltage is larger, prevent overtension and damage power tube; When load changing, same by filter being made to recover normal at short notice to the suitable process 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 and isolated drive circuit 6 the drive singal of low voltage unit and each switching tube of high voltage unit.
Complex controll of the present invention is in fact the control method of main control signal and power compensation signal co-ordination, carries out optimizing flexibly and process to each signal according to different operating states and actual conditions.When filter stability works, power compensation signal is very little on the impact of system; When two concatenation unit DC voltages occur departing from or load changing time, this etching system is by instability, and power compensation signal will display the effect of system, by weight coefficient k
1and k
2optimum option and design, adjust the required active power compensated of each unit DC side, the fast quick-recovery of system is stablized, and therefore, system has stronger adaptive load ability and good sound state compensation performance, and reliability improves greatly.
Under MATLAB software environment, the present invention establishes simulation model and analyzes waveform.Simulation parameter is as follows: line voltage is 220V/50Hz, and nonlinear load is single-phase uncontrollable rectifier bridge joint resistance inductive load (20 Ω, 500mH), 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 concatenation unit DC bus capacitor capacitances are 1000 μ F, and triangular carrier frequency is 20kHz.
Fig. 3 is that the present invention is applied to the line voltage of 220V/50Hz electrical network, power network current, load current, offset current and bucking voltage simulation waveform.As can be seen from the figure power network current does not almost distort, phase place is synchronous with line voltage, bucking voltage is seven level, and simulation result shows: Mixed cascading seven level active filter achieves good compensation effect, demonstrates 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 concatenation unit DC voltage ratios are 1: 2 and are stabilized in set-point, this shows that control method of the present invention can be used for controlling different voltage cell Mixed cascading active filter.
Fig. 5 is that the present invention is applied to the power network current of 220V/50Hz electrical network, offset current and two concatenation unit DC voltages dynamic simulation waveform when impact carries.As can be seen from simulation waveform, when load impact, power network current recovers stable state again only needs one-period, DC voltage fluctuates very little and can return to stationary value very soon, simulation result shows: control method of the present invention can make system have good dynamic property, have stronger adaptive capacity to the change of load, reliability is higher.
Claims (2)
1., based on a Mixed cascading seven level active filter for complex controll, comprise H bridge Mixed cascading main circuit (3), sample circuit (4), control circuit (5) and PWM 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 and nonlinear load (2) respectively, its output is connected with the other end of AC network (1) negative busbar and nonlinear load (2) respectively, the input of sample circuit (4) is connected with H bridge Mixed cascading main circuit (3) and AC network (1) lateral circuit respectively, for gathering the sampled value of voltage and current; It is characterized in that: described control circuit (5) comprises main power signal generation module (7), power compensation signal generation module (8) and complex controll module (9); Wherein the input of main power signal generation module (7) is connected with the output of sample circuit (4) respectively with the first input end of power compensation signal generation module (8); First output of main power signal generation module (7) is connected with the second input of power compensation signal generation module (8), second output of main power signal generation module (7) is connected with the first input end of complex controll module (9), and the output of power compensation signal generation module (8) is connected with the second input of complex controll module (9); The output of complex controll module (9) is connected with the input of PWM with isolated drive circuit (6); PWM 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, power network current sampling CT1 and offset current sampling CT2; The sampled value u of wherein said ac grid voltage sampling VT1
swith the sampled value i of power network current sampling CT1
sinput to main power signal generation module (7); The sampled value u of described low voltage unit DC voltage sampling VT2
1with the sampled value u of high voltage unit DC voltage sampling VT3
2input to main power signal generation module (7) and power compensation signal generation module (8) respectively 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 filter based on complex controll 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, described complex controll module (9) is used for generation first control signal and the second control 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
2two concatenation unit DC side total voltage U are obtained as overlap-add procedure
dc, then by itself and voltage reference U
dc* make comparisons, comparative result sends into voltage controller 1 can obtain an amplitude signal I
s;
The sampled value u of step B, VT1 ac grid voltage
ssending into phase-locked loop pll can standard unit sinusoidal signal e synchronous with line voltage
s, by this standard unit sinusoidal signal e
swith the amplitude signal I obtained in steps A
sbe multiplied, result is power network current reference signal i
s *;
Step C, carries out the sampled value i of sampling and CT1 to actual electric network electric current
s, the power network current reference signal i obtained in calculation procedure B
s *with CT1 power network current sampled value i
sdifference, being passed through current controller can main control signal p
m; Step D, detects offset current i by Current Transmit 2
c;
Step e, according to two concatenation unit DC side total voltage U
dcwith concatenation unit DC voltage mixing ratio k
3draw low voltage unit DC voltage reference value, then with low voltage unit DC voltage sampled value u
1make comparisons, the result compared sends into voltage controller 2 can obtain 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
1i.e. power compensation signal 1;
Step G, according to two concatenation unit DC side total voltage U
dcwith concatenation unit DC voltage mixing ratio k
4draw high voltage unit DC voltage reference value, then with high voltage unit DC voltage sampled value u
2make comparisons, the result compared sends into voltage controller 3 can obtain 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
2i.e. power compensation signal 2;
Step I, by main control signal p
mcarry out corresponding adjustment and obtain p with calculation process
m1and p
m2, p
m1=k
1p
m, p
m2=k
2p
m, i.e. main control signal 1 and main control signal 2, wherein k
1and k
2for adjustable amount;
Step J, main control signal and power compensation signal are coordinated mutually, and main control signal 1 and power compensation signal 1 are obtained the first control signal p as overlap-add procedure
1, main control signal 2 and power compensation signal 2 are obtained the second control signal p as overlap-add procedure
2.
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| JP2003339119A (en) * | 2002-05-21 | 2003-11-28 | Fuji Electric Co Ltd | Power system compensation device |
| 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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| JP2003339119A (en) * | 2002-05-21 | 2003-11-28 | Fuji Electric Co Ltd | Power system compensation device |
| 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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