CN103887818A - Low-voltage ride-through control method for grid-connected inverter - Google Patents

Low-voltage ride-through control method for grid-connected inverter Download PDF

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CN103887818A
CN103887818A CN201410097930.3A CN201410097930A CN103887818A CN 103887818 A CN103887818 A CN 103887818A CN 201410097930 A CN201410097930 A CN 201410097930A CN 103887818 A CN103887818 A CN 103887818A
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voltage
current
value
line voltage
feedforward
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CN103887818B (en
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张刚
曾斌
李凯
孙宁波
徐红兵
严国庆
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University of Electronic Science and Technology of China
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Abstract

The invention discloses a low-voltage ride-through control method for a grid-connected inverter. Whether a power grid works properly can be judged through a dropping state judgment device, so the method has the advantage of being fast in power grid judgment. In specific configuration, the method includes the steps of controlling a given current calculation module to calculate given current target values of the power grid in a normal working state and in a dropping state, and controlling a feedforward weight calculation module to distribute reasonable specific gravity of different voltage feedforward quantities according to the voltage state of the power grid agine. Consequently, current impact at the instant of voltage drop of the power grid can be restrained, and the recovery rate of the current waveform after voltage drop of the power grid can be increased so that the balance of three-phase current output by the inverter during voltage drop of the power grid can be maintained. Thus, it is guaranteed that the grid-connected inverter is in a fault ride-through state and accords with national standard inverter grid-connection requirements.

Description

A kind of low voltage traversing control method that is applicable to combining inverter
Technical field
The invention belongs to inverter technology field, more specifically say, relate to a kind of low voltage traversing control method that is applicable to combining inverter.
Background technology
Along with a large amount of distributed power source access electrical networks, suddenly the impact that started by harsh weather or large load (as large motor, electric furnace arrangement for producing steel etc.), cause the electrical network busbar voltage that this load connects to be fallen, affect other user's normal operating conditions.It is relevant with atrocious weather (as thunderbolt, storm etc.) that statistics shows that more than 60% voltage falls all, and it is short to endanger the large duration.
Generally; the electrical network combining inverter off-grid immediately that breaks down; do not consider duration and the order of severity of fault, can farthest protect like this safety of combining inverter, accounting for the proportion of electrical network in distributed power source generating is acceptable when lower.But, in the time that distributed power source generating occupies larger specific gravity, take the mode of off-grid immediately can increase the recovery difficulty of whole system, even may aggravate fault, finally cause the whole off-grids of grid-connected inverter system of other distributed power source of system, therefore must take effective low voltage crossing control measure, to safeguard the stabilization of power grids.
Line voltage falls and can cause transient current to impact to distributed power source, in existing technology, the one, by the solution on hardware, adopt the capacity of increasing power device that the rush of current of several times of its tolerances is solved, as the resistance to flow valuve of IGBT, A.C. contactor, breaker of plastic casing etc., increase the hardware cost of equipment.The 2nd, by the solution on algorithm, adopt feed forward control method to suppress electrical network and disturb, feedforward term adopts the mean value of line voltage fundamental positive sequence
Figure BDA0000477981450000011
but average voltage has sampling time delay, controls time delay and larger filtering delay-time as feedforward term, makes feedforward term can not well follow the tracks of line voltage, does not reach the object that suppresses voltage fluctuation, falling moment at line voltage still has larger rush of current.And electrical network also can make the three-phase current unbalance of inverter output in the time that Voltage unbalance falls fault, produce negative-sequence current component.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of low voltage traversing control method that is applicable to combining inverter is provided, judge by falling state judging whether electrical network normally works, have electrical network judge fast, combining inverter of time not off-grid, fall the not performance of three-phase balance in overcurrent, falling process of moment.
For achieving the above object, a kind of low voltage traversing control method that is applicable to combining inverter of the present invention, is characterized in that, comprises the following steps:
(1), gather voltage, current signal and the DC voltage signal of electrical network; The outside AD sampling A/D chip of high accuracy by combining inverter middle controller gathers the voltage and current signal of combining inverter, and the line voltage of collection, current signal and DC voltage signal are transferred in digital signal processor DSP;
(2), digital signal processor DSP by the voltage receiving, current signal for control algolithm computing;
(2.1), electrical network three-phase voltage v a, v band v ccarry out clark-park conversion and carry out positive-negative sequence decomposition operation by two synchronous coordinate system decoupling zero phase-locked loops (DDSRF-PLL) module, obtaining the instantaneous value of line voltage fundamental positive sequence
Figure BDA0000477981450000021
pass through again the impact of low pass filter (LPF) filtering harmonic component, obtain the mean value of line voltage fundamental positive sequence
Figure BDA0000477981450000022
convert by clark-park, by power network current i simultaneously a, i band i ctransform to dq rotating coordinate system and carry out computing from abc rest frame, obtain the value of feedback of power network current
Figure BDA0000477981450000023
(2.2), by the instantaneous value of line voltage fundamental positive sequence be sent to and fall state judging, judging whether line voltage enters falls state, then its output is fallen to depth coefficient σ feeds back to given value of current calculator and feedforward weight computation module;
If the phase voltage peak value of line voltage in the time of perfect condition is constant A, the line voltage fundamental positive sequence that line voltage obtains after positive-negative sequence decomposition operation
Figure BDA0000477981450000025
also be constant A, therefore can be by
Figure BDA0000477981450000026
the degree of depth of falling of falling amplitude and judge line voltage, the value of falling depth coefficient σ is:
Figure BDA0000477981450000027
According to national grid standard GBT12325-2008 " quality of power supply supply power voltage deviation " regulation, 220V single phase power supply voltage deviation is nominal voltage-10%～+ 7%, therefore, is less than or equal to 0.1 when falling depth coefficient σ, and line voltage is normal condition; Be greater than 0.1 when falling depth coefficient σ, judge that line voltage enters voltage and falls state;
(2.3), calculate the desired value of the current control module of current bat with
Figure BDA0000477981450000029
In the time that line voltage is normal condition, i.e. σ≤0.1, is P by the power instruction signal of inverter *and Q *, and the mean value of line voltage fundamental positive sequence
Figure BDA00004779814500000210
be input to given value of current calculator, calculate respectively the desired value of the current inner loop control module of current bat
Figure BDA0000477981450000031
with
Figure BDA0000477981450000032
computing formula is:
Figure BDA0000477981450000033
Clap by upper one the value calculating and be assigned to current bat, the value of current bat is as the input value of current control module, and computing formula is: i dref + ( T ) = i dref + ( T - 1 ) σ ≤ 0.1 i qref + ( T ) = i qref + ( T - 1 ) σ ≤ 0.1
In the time judging that line voltage enters voltage and falls state, when σ > 0.1, given value of current calculator modules stops assignment, and the input value of current control module keeps the value in normal moment of line voltage simultaneously, that is:
(2.4), by the value of feedback of the power network current obtaining
Figure BDA0000477981450000036
desired value with the current control module of current bat with be input to current control module, desired value deducts difference that value of feedback obtains after PI controller and decoupling zero control, obtains command voltage simultaneously
Figure BDA0000477981450000039
with
Figure BDA00004779814500000310
(2.5), will in step (2.1), get
Figure BDA00004779814500000311
with be input to feedforward weight computation module simultaneously, obtain feedforward term with
Figure BDA00004779814500000314
According to falling depth coefficient σ, calculate feedforward term by feedforward weight computation module
Figure BDA00004779814500000315
with
Figure BDA00004779814500000316
value; In the time that line voltage is normal, i.e. σ≤0.1 o'clock, feedforward term
Figure BDA00004779814500000317
in the time that line voltage enters voltage and falls state, when σ > 0.1, feedforward term
Figure BDA00004779814500000318
with value by weight coefficient α 1and α 2distribute
Figure BDA00004779814500000320
with
Figure BDA00004779814500000321
ratio determine, computing formula is as follows:
α 1+α 2＝1 α 1、α 2∈[0,1]
α 1 = 0 σ ≤ 0.1 α 2 = 1 σ ≤ 0.1
α 1 = σ σ > 0.1 α 2 = 1 - σ σ > 0.1
Wherein σ ∈ [0,1];
The computing formula of feedforward weight computation module:
Figure BDA00004779814500000324
(2.6) command voltage, step (2.4) being obtained
Figure BDA0000477981450000041
with
Figure BDA0000477981450000042
and the feedforward term obtained of step (2.5)
Figure BDA0000477981450000043
with
Figure BDA0000477981450000044
respectively be added after, and with DC voltage-stabilizing capacitive side voltage V dcjointly be sent to SVPWM space vector PWM modulation module, produce 6 road pulse-width modulation PWM signals and carry out opening and turn-offing of power ratio control switching tube.
Wherein, in described current control module, the assignment of electric current negative phase-sequence desired value is 0, described feedforward weight computation module is only calculated voltage positive sequence component, and the feedforward input of voltage negative sequence component keeps
Goal of the invention of the present invention is achieved in that
The present invention is applicable to the low voltage traversing control method of combining inverter, judges by falling state judging whether electrical network normally works, and has electrical network and judges fast feature of time.In concrete configuration, given current target value when control given value of current computing module calculates electrical network normally and falls, control feedforward weight computation module again according to the voltage status of electrical network, distribute the Rational Proportion of different electric voltage feed forward amounts, thereby inhibition line voltage falls the rush of current of moment, accelerate the resume speed that line voltage falls after-current waveform, during line voltage is fallen, maintain the three-phase balance of inverter output, guaranteed so not off-grid and meet the grid-connected requirement of inverter national standard of combining inverter.
Meanwhile, the low voltage traversing control method that the present invention is applicable to combining inverter also has following beneficial effect:
(1), by falling state judging, can judge rapidly line voltage state, in deterministic process, only exist sampling time delay, DSP to control time delay, there is no filtering delay-time, so faster than traditional determining device;
(2), by feedforward weight computation module, can suppress voltage and fall the rush of current of moment; According to weight coefficient α 1and α 2, distribute
Figure BDA0000477981450000047
with
Figure BDA0000477981450000048
ratio, can suppress voltage and fall the rush of current of moment; And in the time of electrical network normal condition, feedforward term
Figure BDA0000477981450000049
with
Figure BDA00004779814500000410
value be mean value, so can not give command voltage
Figure BDA00004779814500000411
with
Figure BDA00004779814500000412
increase harmonic effects;
(3), by given value of current calculator, during voltage falls, also can maintain size of current constant, can not produce overcurrent;
(4), negative-sequence current desired value amplitude is 0 in current control module, makes output current maintain three-phase equilibrium, does not have negative sequence component;
(5), the present invention is not needing to increase the rush of current that has effectively suppressed to fall moment under hardware cost, has advantage cheaply.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the present invention is applicable to the low voltage traversing control method of combining inverter;
Fig. 2 falls degree of depth determining device theory diagram based on two synchronous coordinate system decoupling zero phase-locked loops (DDSRF-PLL) shown in Fig. 1;
Fig. 3 is the oscillogram that combining inverter line voltage in the time that full power is loaded falls moment;
Fig. 4 is the oscillogram during combining inverter line voltage in the time that full power is loaded falls;
Fig. 5 is the combining inverter oscillogram that line voltage recovers in the time that full power is loaded.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.Requiring particular attention is that, in the following description, in the time that perhaps the detailed description of known function and design can desalinate main contents of the present invention, these are described in here and will be left in the basket.
Embodiment
Fig. 1 is the schematic diagram that the present invention is applicable to the low voltage traversing control method of combining inverter.
Fig. 2 falls degree of depth determining device theory diagram based on two synchronous coordinate system decoupling zero phase-locked loops (DDSRF-PLL) shown in Fig. 1
In the present embodiment, as shown in Figure 1, a kind of low voltage traversing control method that is applicable to combining inverter of the present invention, comprises the following steps:
1), gather voltage, current signal and the DC voltage signal of electrical network; The outside AD sampling A/D chip of high accuracy by combining inverter middle controller gathers the voltage and current signal of combining inverter, and the voltage signal of the line voltage of collection, current signal and DC side is transferred in digital signal processor DSP;
2), digital signal processor DSP by the voltage receiving, current signal for control algolithm computing;
2.1), electrical network three-phase voltage v a, v band v ccarry out clark-park by two synchronous coordinate system decoupling zero phase-locked loops (DDSRF-PLL) module and convert rear and carry out positive-negative sequence decomposition operation, obtain the instantaneous value of line voltage fundamental positive sequence as shown in Figure 2, then pass through the impact of low pass filter (LPF) filtering harmonic component, obtain the mean value of line voltage fundamental positive sequence
Figure BDA0000477981450000052
convert by clark-park, by power network current i simultaneously a, i band i ctransform to dq rotating coordinate system and carry out computing from abc rest frame, obtain the value of feedback of power network current
Figure BDA0000477981450000053
in the present embodiment, employing cut-off frequency is ω flow pass filter (LPF),
Figure BDA0000477981450000054
carry out filtering harmonic component;
2.2), by the instantaneous value of line voltage fundamental positive sequence
Figure BDA0000477981450000061
be sent to and fall state judging, judging whether line voltage enters falls state, then its output is fallen to depth coefficient σ feeds back to given value of current calculator modules and feedforward weight computation module;
The phase voltage peak value of line voltage in the time of perfect condition is constant A, the line voltage fundamental positive sequence that line voltage obtains after positive-negative sequence decomposition operation
Figure BDA0000477981450000062
also be constant A, therefore can be by the degree of depth of falling of falling amplitude and judge line voltage, the value of falling depth coefficient σ is:
Figure BDA0000477981450000064
In the present embodiment, the phase voltage effective value of line voltage in the time of perfect condition is 220V, and phase voltage peak value is 311.1V, the line voltage fundamental positive sequence that line voltage obtains after positive-negative sequence decomposition operation
Figure BDA0000477981450000065
also be 311.1V, the value of falling so depth coefficient σ is:
According to national grid standard GBT12325-2008 " quality of power supply supply power voltage deviation " regulation, 220V single phase power supply voltage deviation is nominal voltage-10%～+ 7%, therefore, is less than or equal to 0.1 when falling depth coefficient σ, and line voltage is normal condition; Be greater than 0.1 when falling depth coefficient σ, judge that line voltage enters voltage and falls state;
2.3), calculate the desired value of the current control module of current bat
Figure BDA0000477981450000067
with
In the time that line voltage is normal condition, i.e. σ≤0.1, is P by the power instruction signal of inverter *and Q *, and the mean value of line voltage fundamental positive sequence
Figure BDA0000477981450000069
be input to given value of current calculator, calculate respectively the desired value of the current inner loop control module of current bat with
Figure BDA00004779814500000611
computing formula is:
Figure BDA00004779814500000612
Wherein, in current control module, the assignment of electric current negative phase-sequence desired value is 0,
Clap by upper one the value calculating and be assigned to current bat, the value of current bat is as the input value of current control module, and computing formula is: i dref + ( T ) = i dref + ( T - 1 ) σ ≤ 0.1 i qref + ( T ) = i qref + ( T - 1 ) σ ≤ 0.1
In the time judging that line voltage enters voltage and falls state, when σ > 0.1, given value of current calculator modules stops assignment, and the input value of current control module keeps the value in normal moment of line voltage simultaneously, that is:
Figure BDA0000477981450000071
2.4), by the value of feedback of the power network current obtaining
Figure BDA0000477981450000072
desired value with the current control module of current bat with
Figure BDA0000477981450000074
be input to current control module, desired value deducts difference that value of feedback obtains after PI controller and decoupling zero control, obtains command voltage simultaneously
Figure BDA0000477981450000075
with
2.5), by step 2.1) in get
Figure BDA0000477981450000077
with
Figure BDA0000477981450000078
be input to feedforward weight computation module simultaneously, obtain feedforward term
Figure BDA0000477981450000079
with
Figure BDA00004779814500000710
According to falling depth coefficient σ, calculate feedforward term by feedforward weight computation module
Figure BDA00004779814500000711
with value; In the time that line voltage is normal, i.e. σ≤0.1 o'clock, feedforward term
Figure BDA00004779814500000713
in the time that line voltage enters voltage and falls state, when σ > 0.1, feedforward term
Figure BDA00004779814500000714
with value by weight coefficient α 1and α 2distribute
Figure BDA00004779814500000716
with
Figure BDA00004779814500000717
ratio determine, computing formula is as follows:
α 1+α 2＝1 α 1、α 2∈[0,1]
α 1 = 0 σ ≤ 0.1 α 2 = 1 σ ≤ 0.1
α 1 = σ σ > 0.1 α 2 = 1 - σ σ > 0.1
Wherein σ ∈ [0,1];
The computing formula of feedforward weight computation module:
Figure BDA00004779814500000720
Wherein, feedforward weight computation module is only calculated voltage positive sequence component, and the feedforward input of voltage negative sequence component keeps
2.6), by step 2.4) command voltage that obtains
Figure BDA00004779814500000722
with
Figure BDA00004779814500000723
with step 2.5) feedforward term obtained
Figure BDA00004779814500000724
with
Figure BDA00004779814500000725
respectively be added after, and with DC voltage-stabilizing capacitive side voltage V dcjointly be sent to SVPWM space vector PWM modulation module, produce 6 road pulse-width modulation PWM signals and carry out opening and turn-offing of power ratio control switching tube.In the present embodiment, control three phase full bridge IGBT with 6 road pulse-width modulation PWM signals and open and turn-off.
Fig. 3 is the oscillogram that combining inverter line voltage in the time that full power is loaded falls moment.
In the present embodiment, with combining inverter, in the time that full power 50KW loads, line voltage drops to 20% for example by 100%, as shown in Figure 3, channel C H1, CH2, CH3 are inverter output three-phase current, and ordinate is every lattice 100A, channel C H4 is line voltage, and ordinate is every lattice 200V; Abscissa is every lattice 5ms; When combining inverter is loaded at full power 50KW, and when three-phase current is normally worked, current peak is 300A, when line voltage drops to 20% by normal value 100%, falling moment, three-phase current maximum impact peak value is 335A, impulse current 35A, and current waveform 5ms recovery time, resume speed is fast, and in 1/4 power frequency period, three-phase current recovers normal.
Fig. 4 is the oscillogram during combining inverter line voltage in the time that full power is loaded falls.
In the present embodiment, with combining inverter, in the time that full power 50KW loads, line voltage drops to 20% for example by 100%, as shown in Figure 3, channel C H1, CH2, CH3 are inverter output three-phase current, and ordinate is every lattice 100A, channel C H4 is line voltage, and ordinate is every lattice 200V; Abscissa is every lattice 5ms; When combining inverter is at full power 50KW load, and three-phase current is while normally working, and current peak is 300A, and when line voltage drops to 20% by normal value 100%, in falling process, three-phase current keeps balance, non-negative sequence current component.
Fig. 5 is the combining inverter oscillogram that line voltage recovers in the time that full power is loaded.
In the present embodiment, with combining inverter, in the time that full power 50KW loads, line voltage drops to 20% for example by 100%, as shown in Figure 3, channel C H1, CH2, CH3 are inverter output three-phase current, and ordinate is every lattice 100A, channel C H4 is line voltage, and ordinate is every lattice 200V; Abscissa is every lattice 5ms; When combining inverter is at full power 50KW load, and three-phase current is while normally working, and current peak is 300A, when line voltage drops to 20% by normal value 100%, in recovery process, three-phase current is without impact peak value, current waveform is adjusted time 5ms, and adjustment cycle is shorter equally.
Although above the illustrative embodiment of the present invention is described; so that those skilled in the art understand the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and definite the spirit and scope of the present invention in, these variations are apparent, all utilize innovation and creation that the present invention conceives all at the row of protection.

Claims (3)

1. a low voltage traversing control method that is applicable to combining inverter, is characterized in that, comprises the following steps:
(1), gather voltage, current signal and the DC voltage signal of electrical network; The outside AD sampling A/D chip of high accuracy by combining inverter middle controller gathers the voltage and current signal of combining inverter, and the line voltage of collection, current signal and DC voltage signal are transferred in digital signal processor DSP;
(2), digital signal processor DSP by the voltage receiving, current signal for control algolithm computing;
(2.1), electrical network three-phase voltage v a, v band v ccarry out clark-park conversion and carry out positive-negative sequence decomposition operation by two synchronous coordinate system decoupling zero phase-locked loops (DDSRF-PLL) module, obtaining the instantaneous value of line voltage fundamental positive sequence
Figure FDA0000477981440000011
pass through again the impact of low pass filter (LPF) filtering harmonic component, obtain the mean value of line voltage fundamental positive sequence
Figure FDA0000477981440000012
convert by clark-park, by power network current i simultaneously a, i band i ctransform to dq rotating coordinate system and carry out computing from abc rest frame, obtain the value of feedback of power network current
Figure FDA0000477981440000013
(2.2), by the instantaneous value of line voltage fundamental positive sequence
Figure FDA0000477981440000014
be sent to and fall state judging, judging whether line voltage enters falls state, then its output is fallen to depth coefficient σ feeds back to given value of current calculator and feedforward weight computation module;
If the phase voltage peak value of line voltage in the time of perfect condition is constant A, the line voltage fundamental positive sequence that line voltage obtains after positive-negative sequence decomposition operation
Figure FDA0000477981440000015
also be constant A, therefore can be by
Figure FDA0000477981440000016
the degree of depth of falling of falling amplitude and judge line voltage, the value of falling depth coefficient σ is:
Figure FDA0000477981440000017
According to national grid standard GBT12325-2008 " quality of power supply supply power voltage deviation " regulation, 220V single phase power supply voltage deviation is nominal voltage-10%～+ 7%, therefore, is less than or equal to 0.1 when falling depth coefficient σ, and line voltage is normal condition; Be greater than 0.1 when falling depth coefficient σ, judge that line voltage enters voltage and falls state;
(2.3), calculate the electric current positive sequence desired value of the current control module of current bat
Figure FDA0000477981440000018
with
Figure FDA0000477981440000019
In the time that line voltage is normal condition, i.e. σ≤0.1, is P by the power instruction signal of inverter *and Q *, and the mean value of line voltage fundamental positive sequence
Figure FDA00004779814400000110
be input to given value of current calculator, calculate respectively the electric current positive sequence desired value of the current control module of current bat
Figure FDA0000477981440000021
with
Figure FDA0000477981440000022
computing formula is:
Figure FDA0000477981440000023
Clap by upper one the value calculating and be assigned to current bat, the value of current bat is as the input value of current control module, and computing formula is:
Figure FDA0000477981440000024
In the time judging that line voltage enters voltage and falls state, when σ > 0.1, given value of current calculator modules stops assignment, and the input value of current control module keeps the value in normal moment of line voltage simultaneously, that is:
(2.4), by the value of feedback of the power network current obtaining
Figure FDA0000477981440000026
electric current positive sequence desired value with the current control module of current bat
Figure FDA0000477981440000027
with
Figure FDA0000477981440000028
be input to current control module, desired value deducts difference that value of feedback obtains after PI controller and decoupling zero control, obtains command voltage simultaneously
Figure FDA0000477981440000029
with
Figure FDA00004779814400000210
(2.5), will in step (2.1), get
Figure FDA00004779814400000211
with
Figure FDA00004779814400000212
be input to feedforward weight computation module simultaneously, obtain feedforward term
Figure FDA00004779814400000213
with
Figure FDA00004779814400000214
According to falling depth coefficient σ, calculate feedforward term by feedforward weight computation module
Figure FDA00004779814400000215
with
Figure FDA00004779814400000216
value; In the time that line voltage is normal, i.e. σ≤0.1 o'clock, feedforward term in the time that line voltage enters voltage and falls state, when σ > 0.1, feedforward term
Figure FDA00004779814400000218
with value by weight coefficient α 1and α 2distribute
Figure FDA00004779814400000220
with
Figure FDA00004779814400000221
ratio determine, computing formula is as follows:
α 1+α 2＝1 α 1、α 2∈[0,1]
Figure FDA00004779814400000223
Wherein σ ∈ [0,1];
The computing formula of feedforward weight computation module:
Figure FDA00004779814400000224
(2.6) command voltage, step (2.4) being obtained with
Figure FDA0000477981440000032
and the feedforward term obtained of step (2.5)
Figure FDA0000477981440000033
with respectively be added after, and with DC voltage-stabilizing capacitive side voltage V dcjointly be sent to SVPWM space vector PWM modulation module, produce 6 road pulse-width modulation PWM signals and carry out opening and turn-offing of power ratio control switching tube.
2. the low voltage traversing control method that is applicable to combining inverter according to claim 1, is characterized in that, comprises the following steps: in described current control module, the assignment of electric current negative phase-sequence desired value is 0,
Figure FDA0000477981440000035
3. the low voltage traversing control method that is applicable to combining inverter according to claim 1, is characterized in that, comprises the following steps: described feedforward weight computation module is only calculated voltage positive sequence component, and the feedforward input of voltage negative sequence component keeps
Figure FDA0000477981440000036
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CN105116195A (en) * 2015-07-13 2015-12-02 中国人民解放军海军工程大学 Voltage drop detection method suitable for power grid voltage large harmonic content
CN106100310A (en) * 2016-06-21 2016-11-09 广州智光电气股份有限公司 A kind of method and apparatus optimizing voltage source converter soft start-up process
CN106655198A (en) * 2016-10-28 2017-05-10 上海电气富士电机电气技术有限公司 Ship voltage drop suppression electrical system and control method thereof
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CN111711226A (en) * 2020-06-05 2020-09-25 南京南瑞太阳能科技有限公司 Chopper circuit-based photovoltaic inverter low voltage ride through control method and device

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CN104135034A (en) * 2014-07-09 2014-11-05 中国科学院广州能源研究所 Network voltage decoupling control method based on LC filter for single-phase photovoltaic grid-connected inverter
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CN106100310A (en) * 2016-06-21 2016-11-09 广州智光电气股份有限公司 A kind of method and apparatus optimizing voltage source converter soft start-up process
CN106100310B (en) * 2016-06-21 2019-03-26 广州智光电气股份有限公司 A kind of method and apparatus optimizing voltage source converter soft start-up process
CN106655198A (en) * 2016-10-28 2017-05-10 上海电气富士电机电气技术有限公司 Ship voltage drop suppression electrical system and control method thereof
CN106655198B (en) * 2016-10-28 2023-07-28 上海电气富士电机电气技术有限公司 Ship voltage drop suppression electrical system and control method thereof
CN108092302A (en) * 2017-11-20 2018-05-29 东南大学 Load virtual synchronous machine low voltage traversing control method
CN108092302B (en) * 2017-11-20 2020-10-27 东南大学 Low voltage ride through control method for load virtual synchronous machine
CN111525610A (en) * 2020-04-26 2020-08-11 深圳麦格米特电气股份有限公司 Control method and device of photovoltaic inverter and photovoltaic inverter
CN111525610B (en) * 2020-04-26 2023-04-11 深圳麦格米特电气股份有限公司 Control method and device of photovoltaic inverter and photovoltaic inverter
CN111711226A (en) * 2020-06-05 2020-09-25 南京南瑞太阳能科技有限公司 Chopper circuit-based photovoltaic inverter low voltage ride through control method and device

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