CN104022509A - Multifunctional electric energy quality regulator for quickly and accurately detecting instruction signals - Google Patents
Multifunctional electric energy quality regulator for quickly and accurately detecting instruction signals Download PDFInfo
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Abstract
The invention provides a multifunctional electric energy quality regulator for quickly and accurately determining instruction signals. The DC side of a serial side inverter and the DC side of a parallel side inverter D2 are respectively connected with a capacitor C. A voltage instruction signal operation module of a serial side APF is connected with a voltage tracking and controlling module. The voltage tracking controlling module is connected with the inverter D1. A current harmonic compensating signal generating module of the parallel side APF is connected with a current tracking and controlling module, and the current tracking and controlling module is connected with the inverter D2. A voltage instruction signal operating module in the serial side APF is connected with the current harmonic compensating signal generating module in the parallel side APF. The capacitor C is accessed into the current harmonic compensating signal generating module in the parallel side APF. The multifunctional electric energy quality regulator has functions of: eliminating interference caused by electric network voltage fluctuation, preventing adverse effect of a used sensor to detection precision, improving accuracy and real-time property in signaling signal detection, reducing amount of used sensors, and reducing equipment cost.
Description
Technical field
The present invention relates to electrical network, specifically grid power electronic equipment and device, more specifically quick and precisely detects the multifunctional electric energy quality adjustor of command signal
Background technology
Along with scientific and technical progress, the electrification of society, the level of informatization improves constantly, on the one hand, modern power electronics technology fast development, various nonlinear-loads are widely applied in electric power system and power consumer with power electronic equipment and the device with nonlinear characteristic, as variable-frequency governor, thyristor variable flow device, Switching Power Supply, the extensive use of household electrical appliance etc., in electrical network, introduce serious harmonic pollution, and electric locomotive, the use of the large-scale electric equipments such as steel rolling equipment, also can make electric power system produce voltage falling or rising, the phenomenon of voltage fluctuation, these problems cause the quality of power supply to worsen, on the other hand, power consumption equipments various complexity, accurate, to quality of power supply sensitivity constantly universal, as the automatic control equipment of accurate laboratory apparatus, made with high precision process, high performance household electrical appliance and office equipment etc., more and more higher to quality of power supply requirement.Therefore, improve the electrical network quality of power supply, the requirement that solves electric power system and power consumer both sides of supply and demand contradiction is day by day urgent.
Current harmonics and various voltage transient disturbance are the two class problems that the most often occur in electrical network, conventionally use parallel active filter to suppress it for current harmonics, and for quality of voltage problem, comprise Voltage Harmonic and voltage transient fluctuation, usually need to rely on series active power filter to solve, but all there is the shortcoming of function singleness in two kinds of active filters (APF), and power quality problem in electric power system often presents diversity and complexity, in the time that various electric current and voltage quality problems exist simultaneously and add other forms of interference, the active filter of function singleness just can not improve the quality of power supply well, for example, for existing voltage-sensitive load on same distribution bus, there is again nonlinear-load, also have in the situation of impact load, voltage compensator and current compensator just need to be installed simultaneously.If all take respectively the adjuster of a type for each power quality problem, multiple like this device uses the cost that will greatly increase control measures simultaneously, also can increase the complexity of device operation maintenance, and between each device, also exist the problem of cooperation, affect the reliability of cooperation, both uneconomical, also unrealistic.So, the research of the device that can simultaneously solve multiple power quality problem is just produced thus to i.e. multifunctional electric energy quality adjustor.In this system, side active filter (PAPF) and series side active filter (SAPF) in parallel, be grouped together by public DC bus, the problem such as harmonic wave, reactive current can compensating load causing, again can offset supply voltage swells, the power quality problem such as rapid drawdown, asymmetric, flickering, fluctuation, be a kind of electric energy regulator with comprehensive function.
Multifunctional electric energy quality adjustor is the combination of series and parallel type APF, and adjuster adopts the left right side form also of going here and there of three-phase three-wire system to connect, and series side APF is connected with main line by transformer, the fluctuation of filtering Voltage Harmonic and inhibition supply voltage; Side APF filtering load current harmonic wave in parallel and improve power factor.
The research of multifunctional electric energy quality adjustor at present is also in the experimental stage, and a key factor that restricts its development is how can detect quickly and accurately electric current and voltage command signal.Owing to being the prerequisite of multifunctional electric energy quality adjustor reliably working to the detection of command signal, the rapidity of detection method and accuracy are directly connected to the quality of compensation effect, and existing command signal detection method need to be carried out complicated coordinate transform mostly, exist operand larger, the bad problem with being difficult to realize of real-time, and accuracy of detection is easily affected in the time that supply power voltage exists fluctuation, simultaneously, need to use a large amount of transducers to detect electric current and voltage, cause the compensation precision of adjuster to be affected, these factors have all restricted the development of electric energy regulator.
What some were common be applied in, and multifunctional electric energy quality adjustor side command signal in parallel detection method mainly comprises analytical method, fourier transform analysis method, instantaneous reactive power method, adaptive interference cancellation method and the Wavelet Transform based on Fryze power definition.Based on the analytical method of Fryze power definition, calculate simpler, but cannot be applicable to supply power voltage exist fluctuation occasion; The fourier transform analysis such as DFT and FFT method, can separate the harmonic component existing in electric current and voltage, but operand is large, real-time is poor; Adaptive interference cancellation method also has good ability in the time that voltage exists fluctuation and disturbs, and shortcoming is that dynamic responding speed is slower; Wavelet transformation analysis method is specially adapted to the situation that voltage and current signal is affected by ringing to undergo mutation, but its harmonic wave is detected to real-time and accuracy all to be improved; Traditional alpha-beta transform method based on instantaneous reactive power theory, there is the feature that realizes of being easy to, but need to carry out complicated coordinate transform, have that operand is large, the bad problem of real-time, and in the time that supply power voltage exists fluctuation, precision is easily influenced, has restricted its development.
Summary of the invention
Use for current multifunctional electric energy quality adjustor that command signal detection algorithm ubiquity operand is large, the bad problem of real-time, and precision is easily influenced in the time that supply power voltage exists fluctuation, the object of the invention is multifunctional electric energy quality adjustor side command signal in parallel detection method to be optimized, propose a kind of multifunctional electric energy quality adjustor that can quick and precisely detect command signal.
The multifunctional electric energy quality adjustor that quick and precisely detects command signal of the present invention comprises series side APF and side APF in parallel, and the innovations compared different from prior art are: also comprise coupling transformer Tr, two three-phase voltage source type inverter D1 and D2, storage capacitor C, two three-phase filter inductance l
1with l
2, the DC side of series side three-phase voltage source inverter D1 all accesses storage capacitor C with the DC side of side three-phase voltage source inverter D2 in parallel, and three-phase filter inductance l is passed through respectively in the interchange output of series side three-phase voltage source inverter D1
1after, being connected on the former limit of the coupling transformer Tr of star-like connection, the interchange output of side three-phase voltage source inverter D2 in parallel connects respectively three-phase filter inductance l
2;
Series side APF comprises voltage command signal computing module and connected voltage-tracing control module, voltage-tracing control module access series side three-phase voltage source inverter D1;
Side APF in parallel comprises current harmonics compensating signal generation module and is connected current tracking control module with it, and current tracking control module accesses side three-phase voltage source inverter D2 in parallel;
Voltage command signal computing module in series side APF connects the current harmonics compensating signal generation module in side APF in parallel;
Storage capacitor C accesses in the current harmonics compensating signal generation module in side APF in parallel.
In adjuster of the present invention, two three-phase voltage source type inverter D1 and D2 are all made up of turn-off device.
In described current tracking control module, be provided with hysteresis comparator, hysteresis comparator connects side three-phase voltage source inverter D2 in parallel.
In described current harmonics compensating signal generation module, PID controller is set, storage capacitor C accesses in the current harmonics compensating signal generation module in side APF in parallel, is actually access PID controller.
In voltage command signal computing module in series side APF, phase-locked loop connection standard forcing function generator, standard sine generator access compute chip, compute chip connects low pass filter, the output of low pass filter accesses compute chip again, current harmonics compensating signal generation module in compute chip Yi road output access side APF in parallel, another road output access voltage-tracing control module.
Compute chip is operation program need to be installed just can carry out the chip of computing or do not need operation program is installed and the chip that directly carries out computing by hardware.
The function Main Function of series side APF in the present invention has two: 1, suppress Voltage Harmonic and compensation network voltage fluctuation; 2, the phase information of electrical network fundamental voltage component is provided for side in parallel.
Just can carry out the chip of computing to operation program need to be installed, first in the voltage command signal computing module in series side APF, operation program is installed, compute chip just can be carried out computing according to program.The chip that directly carries out computing by hardware if do not need operation program is installed, saves this step.Series side APF is by the three-phase mains voltage signal (u detecting
sa, u
sb, u
sc) input voltage command signal computing module, after processing and computing, obtain three-phase fundamental voltage signal u
afu
bfu
cf, these three fundamental voltage components are inputted the current harmonics compensating signal generation module in side APF in parallel on the one hand, provide phase information for side command signal in parallel detects, and can obtain thus on the other hand command signal; Voltage-tracing control module is controlled series side three-phase voltage source inverter D1 after receiving this command signal, makes it that generation equates with harmonic voltage and voltage transient disturbing signal amplitude, the compensating signal of opposite direction.Harmonic voltage and voltage transient disturbing signal contained in the voltage signal of compensating signal and grid side offset, thereby have realized the object that the supply voltage that is loaded in load is standard sine wave, improve quality of voltage.
Side APF in parallel is by the load current i detecting
la, i
lb, i
lcbe sent to current harmonics compensating signal generation module; The three-phase fundamental voltage signal u that current harmonics compensating signal generation module is sent here according to series side APF
afu
bfu
cfextraction standard fundametal compoment i
lpphase information S, utilizes DC bus capacitor (storage capacitor C) virtual voltage U
dcthe amplitude I* of stable regulation target current, phase information S and amplitude I* are done after multiplying, obtain required source current standard first-harmonic real component i
lp, and obtain with compensate after power network current i
serror delta i.This waveform deviation delta i is directly sent into current tracking control module, produce control signal control side inverter circuit in parallel D2 work, output offset current Δ i
c, this offset current Δ i
cafter harmonic component being cancelled out each other with the idle component in power network current, can improve the waveform of power network current.
The present invention is based on and detecting source current waveform deviation delta i (is the control program of compensating error Δ side APF in parallel i), do not need the offset current of inverter circuit output to detect, thereby do not need to use transducer to gather the offset current i of inverter circuit output
conly need to be using the compensating error Δ i of the source current detecting the input of the stagnant ring comparison controller in current tracking control module, this detection control mode does not need the output of the inverter circuit under the control of the stagnant ring comparison controller of side in parallel to detect, thereby has avoided the adverse effect that uses transducer to cause accuracy of detection.
Source current command signal i of the present invention
lpthe three-phase fundamental voltage signal u that extracted when the computations signal by series side APF of phase place
nf(be u
af, u
bfand u
cf) provide, because the three-phase fundamental voltage component u that series side active filter obtains
af, u
bfand u
cfbe not subject to the impact of voltage ripple of power network, so, thisly eliminate for side APF in parallel provides the method for phase information the interference causing because of voltage ripple of power network, thereby improved accuracy and real-time that side APF command signal in parallel detects.Meanwhile, reduce the transducer that side detectable voltage signals in parallel is used, reduced the cost of equipment.
Brief description of the drawings
Fig. 1 is the multifunctional electric energy quality adjustor structure chart that quick and precisely detects command signal of the present invention.
Fig. 2 is that series side APF command signal detects schematic diagram.
Fig. 3 is side APF standard fundametal compoment i in parallel
lpphase information is extracted schematic diagram.
Fig. 4 is side APF command signal amplitude schematic diagram calculation in parallel.
Fig. 5 detects stagnant chain rate under source current mode compared with control principle drawing.
Fig. 6 is that stagnant chain rate under traditional detection mode is compared with control principle drawing.
Embodiment
See Fig. 1.
The multifunctional electric energy quality adjustor that quick and precisely detects command signal of the present invention, comprises coupling transformer Tr, two three-phase voltage source type inverter D1 and D2, storage capacitor C, two three-phase filter inductance l
1with l
2, the DC side of series side three-phase voltage source inverter D1 all accesses storage capacitor C with the DC side of side three-phase voltage source inverter D2 in parallel, and three-phase filter inductance l is passed through respectively in the interchange output of series side three-phase voltage source inverter D1
1after, be connected on the former limit of the coupling transformer Tr of star-like connection, three secondary of coupling transformer Tr are connected on respectively on the circuit between power supply and the load in three-phase system, and the interchange output of side three-phase voltage source inverter D2 in parallel connects respectively three-phase filter inductance l
2after, be directly connected on electrical network.
Series side APF comprises voltage command signal computing module and connected voltage-tracing control module, voltage-tracing control module access series side three-phase voltage source inverter D1;
Side APF in parallel comprises current harmonics compensating signal generation module and is connected current tracking control module with it, and current tracking control module accesses side three-phase voltage source inverter D2 in parallel;
Voltage command signal computing module in series side APF connects the current harmonics compensating signal generation module in side APF in parallel;
Storage capacitor C accesses in the current harmonics compensating signal generation module in side APF in parallel.
First the multifunctional electric energy quality adjustor that quick and precisely detects command signal detects supply voltage u
sa, u
sb, u
scwith load current i
la, i
lb, i
lc, the supply voltage detecting and electric current are sent to respectively in series side APF and side APF in parallel.Series side APF calculates command signal according to instantaneous reactive power theory, and then by voltage-tracing control module control series side inverter circuit D1 work, output bucking voltage, improves quality of voltage problem; Specifically see the explanation of doing according to Fig. 2 below.In the series side APF course of work, by the fundamental voltage signal u extracting
af, u
bfand u
cfbe sent to side in parallel for providing side in parallel required phase information, side APF in parallel obtains command signal according to the command signal detection method adopting, by current tracking control module control side inverter circuit in parallel D2 work, output offset current, improve current quality, specifically see the explanation of doing according to Fig. 3～Fig. 5 below.
In the present invention, two three-phase voltage source type inverter D1 and D2 are all made up of turn-off device.
In voltage command signal computing module in series side APF, phase-locked loop connection standard forcing function generator, standard sine generator access compute chip, compute chip connects low pass filter, the output of low pass filter accesses compute chip again, current harmonics compensating signal generation module in compute chip Yi road output access side APF in parallel, another road output access voltage-tracing control module (referring to Fig. 2).Consider price problem, the compute chip in this specific embodiments still adopts the chip that operation program need to be installed just can carry out computing.
Storage capacitor C accesses the PID controller (referring to Fig. 4) in the current harmonics compensating signal generation module in side APF in parallel.
In described current tracking control module, be provided with hysteresis comparator, hysteresis comparator connects side three-phase voltage source inverter D2 in parallel (referring to Fig. 5).
See Fig. 2.
Wherein: u
safor a phase supply voltage
Matrix C
-1for the inverse matrix of C, matrix
for C
32transposed matrix
First in the voltage command signal computing module in series side APF, operation program is installed, compute chip just can be carried out computing according to program.Series side APF is by the three-phase mains voltage signal (u detecting
sa, u
sb, u
sc) carry out C
32matrix coordinate transform, is transformed into alpha-beta coordinate system by three-phase mains voltage signal, then with through the unit sinusoidal signal of phase-locked loop (PLL) and the generation of standard sine generator does matrix operation, obtains instantaneous active voltage signal u
pwith instantaneous reactive voltage signal u
q, these two signals are sent in low pass filter (LPF), after low-pass filtering, obtain meritorious DC quantity
with idle DC quantity
.Be reduced to a, b, c three-phase fundamental voltage signal u through inverse transformation
afu
bfu
cf, (these three fundamental voltage components will provide phase information for side command signal in parallel detects), poorer with the three-phase mains voltage signal of input, just can extract wherein contained harmonic voltage signal (u
ah, u
bh, u
ch).Using the deviation that detects harmonic wave and load required voltage in supply voltage as command signal, control inverter, makes it that generation equates with harmonic voltage and voltage transient disturbing signal amplitude, the compensating signal of opposite direction.Harmonic voltage and voltage transient disturbing signal contained in the voltage signal of compensating signal and grid side offset, thereby have realized the object that the supply voltage that is loaded in load is standard sine wave, improve quality of voltage
See Fig. 3.Side APF standard first-harmonic real component i in parallel
lpphase extraction.
Fig. 3 is side APF standard fundametal compoment i in parallel
lpphase information is extracted schematic diagram.Wherein: u
nfthat three-phase mains voltage fundametal compoment (is the u in Fig. 1
af, u
bf, u
cf), U
sbe AC power fundamental voltage amplitude, S is and the synchronous unit of three-phase fundamental voltage sinusoidal signal (be the situation of a phase here, actual be to be produced by three-phase fundamental voltage signal simultaneously).
Traditional multifunctional electric energy quality adjustor adopts the method such as signal generator and phase-locked loop to obtain line voltage fundamental phase conventionally, and this method is subject to the impact of voltage ripple of power network conventionally, and accuracy and real-time that fundamental phase is detected are affected.Source current command signal i of the present invention
lpthe three-phase fundamental voltage signal u that extracted when the computations signal by series side APF of phase place
nf(be the u in Fig. 1
af, u
bfand u
cf) provide, because the three-phase fundamental voltage component u that series side active filter obtains
af, u
bfand u
cfbe not subject to the impact of voltage ripple of power network, so, thisly eliminate for side APF in parallel provides the method for phase information the interference causing because of voltage ripple of power network, thereby improved accuracy and real-time that side APF command signal in parallel detects.Meanwhile, reduce the transducer that side detectable voltage signals in parallel is used, reduced the cost of equipment.
See Fig. 4.Side APF standard first-harmonic real component i in parallel
lpamplitude calculate.
U in Fig. 4
dcdC bus capacitor virtual voltage,
dC capacitor voltage standard value, I
*be fundamental current amplitude, utilize U
dcthe amplitude I of stable regulation target current
*, do after multiplying with the command signal phase information S obtaining in Fig. 3, obtain required source current standard first-harmonic real component i
lp.
See Fig. 5 and Fig. 6.Based on the multifunctional electric energy quality adjustor side APF in parallel control program that detects source current waveform deviation delta i.
In parallel active filter, when containing fundamental current i in harmonic source load
lfand harmonic current i
lh, fundamental current i
lfcomprise again fundamental active current i
lpwith fundamental reactive current i
lqtime, one of side APF output in parallel and harmonic current i
lhwith reactive current i
lqthe offset current i that sum is contrary
ctime, power network current i
sjust only comprise the first-harmonic real component i in load current
lp, available one group of following formula is described:
i
s＝i
L+i
c (1)
i
L＝i
Lp+i
Lq+i
Lh (2)
Make i
c=-(i
lq+ i
lh) (3)
I
s=i
lp(4)
I.e. source current i after compensation
sstandard first-harmonic real component i
lp, but the offset current i exporting in practice
cbecause the existence of various High-frequency Interference makes i
ccan not compensate for the harmonic current i in power network current completely
lhwith reactive current i
lq, same power network current i after overcompensation
swith standard first-harmonic real component i
lpthere is certain error delta i.Will be above (2)～(4) formula be updated in (1) formula, obtain
i
s＝i
Lp+Δi (5)
In formula, Δ i is the compensating error that power network current obtains after compensation arrangement compensation, and the compensating error Δ i of source current is harmonic current i
lh, reactive current i
lqoffset current i with parallel active filter output
cthree's sum
Δi＝i
Lh+i
Lq+i
c (6)
Wherein i
c=-(i
lh+ i
lq), in (6) formula, due to offset current i
cexistence, make the value of waveform deviation delta i of source current less.The present invention is directly sent to this waveform deviation delta i in hysteresis comparator, controls inverter circuit output offset current Δ i
c, this offset current Δ i
cafter harmonic component being cancelled out each other with the idle component in power network current, can improve the waveform of power network current.
Realize above-mentioned purpose, first we need to obtain the standard first-harmonic real component i of power network current
lp.I
lpcomprise phase information S and amplitude information I
*, phase information S is provided by the series side APF of multifunctional electric energy quality adjustor, amplitude information I
*exported by DC side PID controller.
Common side APF in parallel follows the tracks of the method control inverter circuit output offset current i controlling by employing
ctypical tracking and controlling method is current hysteresis comparison control, it is fast that this relatively control method has response speed, control precision is higher, easily do not realize with not needing to understand the characteristic of load and being widely used, but, in this control method, need to use transducer to gather the offset current i of inverter circuit output
c, by the offset current i collecting
cfeed back to the instruction current obtaining with process matrix computations in stagnant ring comparison controller
difference as the input of stagnant ring comparison controller, as shown in Figure 6.Cause like this decline of compensation precision, the compensation effect of source current has been caused to adverse effect, also increased the cost of compensation equipment simultaneously.
The control program that the present invention is based on the side APF in parallel that detects source current waveform deviation delta i does not need the offset current of inverter circuit output to detect, input that only need to be using the compensating error Δ i of the source current detecting as stagnant ring comparison controller, as shown in Figure 5.This detection control mode does not need the output of the inverter circuit under the control of the stagnant ring comparison controller of side in parallel to detect, thereby has avoided the adverse effect that uses transducer to cause accuracy of detection.
Can find out clearly from above, the multifunctional electric energy quality adjustor tool that quick and precisely detects command signal of the present invention has the following advantages.
1, because series side APF can provide the phase information of line voltage fundametal compoment accurately for side APF in parallel, the interference of having avoided voltage ripple of power network to detect side APF phase information in parallel, improve the accuracy that command signal detects, reduce the transducer using for detection of grid voltage signal simultaneously, saved equipment cost; Optimization system structure, the impact of transducer on accuracy of detection while reducing command signal detection.
2, side waveform deviation delta i in parallel does not need to carry out complex calculations, save the command signal calculating section of some of complex in parallel, overcome the bad shortcoming of traditional multifunctional electric energy quality adjustor real-time, the real-time of side APF in parallel is improved, thereby improve the real-time of whole system.
3, reduce the number of sensors that side command signal in parallel detects and stagnant ring comparison controller uses, saved inverter circuit and be and detected the offset current of output but the transducer of use, improved real-time and the accuracy of system, reduced equipment cost simultaneously
4, the method for side detection waveform deviation in parallel has the feature of the realization of being easy to.
5, the present invention is by the standard fundametal compoment i of series side instantaneous reactive power theory and side in parallel
lpthe combination of phase information extracting method, making series connection part and the part in parallel of adjuster is no longer two modules that work alone, be conducive to whole adjuster effectively to coordinate to control, make multifunctional electric energy quality adjustor of the present invention can bring into play better compensating action.
Claims (6)
1. quick and precisely detect the multifunctional electric energy quality adjustor of command signal, comprise series side APF and side APF in parallel, it is characterized in that: also comprise coupling transformer Tr, two three-phase voltage source type inverter D1 and D2, storage capacitor C, two three-phase filter inductance l
1with l
2, the DC side of series side three-phase voltage source inverter D1 all accesses storage capacitor C with the DC side of side three-phase voltage source inverter D2 in parallel, and three-phase filter inductance l is passed through respectively in the interchange output of series side three-phase voltage source inverter D1
1after, being connected on the former limit of the coupling transformer Tr of star-like connection, the interchange output of side three-phase voltage source inverter D2 in parallel connects respectively three-phase filter inductance l
2;
Series side APF comprises voltage command signal computing module and connected voltage-tracing control module, voltage-tracing control module access series side three-phase voltage source inverter D1;
Side APF in parallel comprises current harmonics compensating signal generation module and is connected current tracking control module with it, and current tracking control module accesses side three-phase voltage source inverter D2 in parallel;
Voltage command signal computing module in series side APF connects the current harmonics compensating signal generation module in side APF in parallel;
Storage capacitor C accesses in the current harmonics compensating signal generation module in side APF in parallel.
2. adjuster according to claim 1, is characterized in that: two three-phase voltage source type inverter D1 and D2 are all made up of turn-off device.
3. adjuster according to claim 1, is characterized in that: in current tracking control module, be provided with hysteresis comparator, hysteresis comparator connects side three-phase voltage source inverter D2 in parallel.
4. adjuster according to claim 1, is characterized in that: storage capacitor C accesses the PID controller in the current harmonics compensating signal generation module in side APF in parallel.
5. adjuster according to claim 1, it is characterized in that: in the voltage command signal computing module in series side APF, phase-locked loop connection standard forcing function generator, standard sine generator access compute chip, compute chip connects low pass filter, the output of low pass filter accesses compute chip again, the current harmonics compensating signal generation module in compute chip Yi road output access side APF in parallel, another road output access voltage-tracing control module.
6. adjuster according to claim 5, is characterized in that: compute chip is operation program need to be installed just can carry out the chip of computing or do not need operation program is installed and the chip that directly carries out computing by hardware.
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| CN105244880A (en) * | 2015-10-19 | 2016-01-13 | 深圳供电局有限公司 | Method and system for suppressing direct-current voltage fluctuation of power quality adjusting device |
| CN107741526A (en) * | 2017-10-24 | 2018-02-27 | 江苏大学 | A kind of Research on Unified Power Quality Conditioner and its method for the detection of harmonic distortion amount |
| CN110474337A (en) * | 2019-07-10 | 2019-11-19 | 国网辽宁省电力有限公司电力科学研究院 | It is a kind of that control strategy is promoted based on the micro-capacitance sensor power quality for improving UPQC detection method |
| CN111525575A (en) * | 2020-07-06 | 2020-08-11 | 深圳华工能源技术有限公司 | Voltage stabilization energy conservation and harmonic suppression energy conservation coordination control method |
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| CN107741526A (en) * | 2017-10-24 | 2018-02-27 | 江苏大学 | A kind of Research on Unified Power Quality Conditioner and its method for the detection of harmonic distortion amount |
| CN107741526B (en) * | 2017-10-24 | 2021-01-15 | 江苏大学 | Unified power quality regulator and method for detecting harmonic distortion thereof |
| CN110474337A (en) * | 2019-07-10 | 2019-11-19 | 国网辽宁省电力有限公司电力科学研究院 | It is a kind of that control strategy is promoted based on the micro-capacitance sensor power quality for improving UPQC detection method |
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