CN109449941A - Voltage source operating mode active filter control method based on virtual impedance control - Google Patents
Voltage source operating mode active filter control method based on virtual impedance control Download PDFInfo
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- CN109449941A CN109449941A CN201811227105.5A CN201811227105A CN109449941A CN 109449941 A CN109449941 A CN 109449941A CN 201811227105 A CN201811227105 A CN 201811227105A CN 109449941 A CN109449941 A CN 109449941A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
Abstract
The present invention provides a kind of voltage source operating mode active filter control method based on virtual impedance control, and this method passes through 1) the virtual impedance design of distributed generation resource resonance；2) the virtual impedance control of resonance；3) voltage of distributed generation resource and frequency instruction calculate；4) the PCC current harmonics virtual impedance control of distributed generation resource；5) distributed generation resource output voltage control realizes the inhibition to electric harmonic in micro-capacitance sensor.This method has electric harmonic measurement links dependence low, and dynamic property is high, and hardware puts into low advantage.In terms of improving micro-grid system power quality, improving micro-grid system stability with good application prospect.
Description
Technical field
The invention belongs to and power quality control technology field, and in particular to it is a kind of based on virtual impedance control voltage source
Operating mode active filter control method.
Background technique
For the short crisis for alleviating traditional energy, it is ensured that the sustainable development of the mankind uses renewable energy for primary energy
The distributed generation system in source is widelyd popularize and is applied.But the increase of distributed power generation permeability in power distribution network, it is right
The characteristics of tidal flow and stability of power grid bring larger impact.In the advantage for integrating distributed power generation to greatest extent, weaken simultaneously
Under the premise of many adverse effects of distributed generation grid-connected bring, distributed generation system and load are integrated into micro-capacitance sensor
Control mode is widely adopted.Since the distributed generation resource system in micro-capacitance sensor mostly uses power electronic equipment and grid interface, this
The nonlinear characteristic of a little power electronic equipments makes micro-grid system harmonic pollution problems occur, simultaneously as renewable energy
Self-characteristic and its mutual influence, power quality problem is then more acute, or even can cause to the stability of micro-capacitance sensor
It influences.Therefore, the electric harmonic of distributed generation system how is reduced, promotes the control method of micro-grid system power quality urgently
To be studied and breakthrough.
Currently, expanding research in terms of promoting micro-grid system power quality there are many scholar both at home and abroad.Mainly may be used
It is divided into following two categories research contents:
(1) first kind research is mainly around itself harmonic expansion for how reducing distributed generation resource.Such method is based on more
The parameter designing of LCL filter realizes the inhibition to distributed generation resource itself harmonic wave, but since LCL filtering link may make up one
3 rank resonance circuits, therefore, when more distributed generation resource parallel runnings, multiple LCL circuit in parallel will constitute the resonance of higher order
Circuit, when system is under the conditions of underdamping, LCL filter circuit will likely generate resonance phenomena, cause micro-grid system electric
The reduction of energy quality and operation stability.To solve the problems, such as such, some scholars establish the micro-capacitance sensor of multiple distributed generation resources
System resonance case study model, and a series of active damping control method of distributed generation resources is proposed for the class model.
(2) second class researchs are mainly around the harmonic expansion for how reducing micro-grid system.Such method is mostly used micro-
Increase the mode of electric-power filter in power grid to realize the inhibition of electric harmonic, and electric-power filter can be divided into passive filter
With two class of active filter, but due to passive filter there are bad adaptability, overload capacity is low, is also easy to produce resonance etc. many asks
Topic, therefore, Active Power Filter-APF receives more concerns.Active filter can be divided into again according to its application mode tandem type and
Two class of parallel connection type, and the latter obtains more applications in micro-capacitance sensor, the control section of shunt active power filter is examined by harmonic wave
It surveys and extracts link and current follow-up control strategy two large divisions composition.It is defeated with it that its equivalent circuit is represented by instruction current source
The form of impedance parallel connection out, when actual motion, shunt active power filter uses current source operating mode, according to the humorous of compensation point
Harmonic current compensation instruction is calculated in wave current detecting result, and generation one is equal in magnitude, opposite in phase with harmonic current
Electric current, and then offset the harmonic current that harmonic source generates.Currently, being such as based on wink there are many implementation methods of harmonic measure link
The i of Shi Wugong theoryp-iqAlgorithm, the DFT based on frequency domain and fft algorithm and more DQ rotary process based on time domain etc..
In above-mentioned power harmonic suppression method, the power harmonic suppression that first kind method only can solve inside micro-capacitance sensor is asked
Topic cannot achieve the inhibition of electric harmonic at i.e. PCC (Point ofCommon Coupling) at micro-capacitance sensor and grid interface；
And although the second class mode can solve the inhibition of electric harmonic at PCC, but need to increase new power electronics in systems
Device, this will introduce new harmonic wave, and the harmonic characterisitic model that will change original micro-grid system in systems, lead to system
Complexity is got higher, and also increases the construction cost of system, and such method is higher to the dependence of current harmonics measurement result, so that
There are larger difficulties for the design of system controlling unit.In consideration of it, the invention proposes a kind of voltage sources based on virtual impedance control
Operating mode micro-capacitance sensor active filter control method.
Summary of the invention
It is a kind of just virtual the purpose of the present invention is proposing on the basis of not increasing power electronic equipment quantity in micro-capacitance sensor
The active power filtering control method of impedance control.The present invention ensure distributed generation resource realize micro-capacitance sensor power supply function on the basis of,
By the design to distributed generation resource virtual impedance, it can be achieved that the harmonic wave at the inhibition of distributed generation resource resonance and micro-capacitance sensor PCC presses down
System provides a kind of new method to improve micro-capacitance sensor power quality.
Virtual impedance refers to based on the equivalent impedance definition in circuit, by using corresponding control strategy, so that distribution
System desired characteristic can be presented in the equivalent output impedance of formula power-supply system.In the control of micro-capacitance sensor distributed power source, it can lead to
Cross dynamic equivalent circuit and the equivalent circuit of the system be calculated in control algolithm, the circuit be represented by controllable voltage source with etc.
The series circuit of impedance is imitated, equivalent impedance value is related to distributed generation resource controlling unit.In practical application, equivalent impedance is
Different amplitudes, phase angle characteristics is presented in transmission function form on frequency domain, therefore its corresponding equivalent impedance also has difference
Amplitude, phase angle characteristics.
The present invention specifically adopts the following technical scheme that
A kind of voltage source operating mode active filter control method based on virtual impedance control, this method includes following
Step:
1) the virtual impedance design of distributed generation resource resonance: according to the resonance of distributed power supply system Bode diagram computing system frequency
Rate；
2) the virtual impedance control of resonance: acquisition distributed generation resource output voltage current signal extracts resonance frequency primary current,
Virtual impedance pressure drop is calculated based on resonance frequency primary current and active damping impedance product；
3) voltage of distributed generation resource and frequency instruction calculate: distributed generation resource output voltage current first harmonics signal is extracted,
Power supply active power of output and reactive power are calculated, is referred to according to the fundamental voltage that output power meter calculates distributed generation resource with frequency
It enables, using fundamental voltage instruction and the difference of virtual impedance pressure drop as final voltage instruction；
4) the PCC current harmonics virtual impedance control of distributed generation resource: using outer ring PIR controller, inner ring P controller
Mode improves harmonic wave time equivalent impedance, and outer ring realizes that output voltage feedback control, inner ring realize output Current Feedback Control；
5) output voltage form, control electric power electricity distributed generation resource output voltage control: are calculated using SVPWM modulation system
Each device working condition in sub-device.
Preferably, system resonance frequencies G in step 1)i_o(s)Calculation are as follows:
In formula, kPWMRepresent PWM link equivalent gain, the G of distributed generation resourcei(s)Represent distributed generation resource current loop control
Device transmission function, L represent distributed electrical source filter inductance, LoRepresent microgrid side filter inductance, C represents filter capacitor.
Preferably, in step 2) the virtual impedance control of resonance concrete mode are as follows:
The dynamic model of voltage source operating mode distributed generation resource equivalent circuit is as follows:
In formula, v represents output voltage, vinRepresent open loop consecutive mean output voltage, iLRepresent filter inductance electric current, i generation
The variable function that table exports electric current, u representation switch state determines；
The open loop consecutive mean output voltage of voltage source operating mode current transformer is expressed as follows:
By uvinIt indicates are as follows:
V=avref-bi
In formula, vrefFor command voltage, a is command voltage coefficient, and b is output current coefficient；
The transmission function of bandstop filter is as follows:
In formula, ω0For bandpass filter resonance frequency, Q is quality factor.
Preferably, the concrete mode that the voltage of distributed generation resource and frequency instruction calculate in step 3) are as follows:
Distributed generation resource output voltage current first harmonics signal is extracted, power supply active power of output and reactive power are calculated:
In formula, P represents the reactive power of distributed generation resource, v for the active power of distributed generation resource, Qo_dRepresent distribution
D axis component of the electric power output voltage under synchronous rotating frame, vo_qDistributed generation resource output voltage is represented to sit in synchronous rotary
Q axis component, i under mark systemo_dRepresent d axis, i of the distributed generation resource output electric current under synchronous rotating frameo_qRepresent distribution
Q axis component of the formula electric power outputting current under synchronous rotating frame；
The fundamental voltage of distributed generation resource is calculated according to output power meter and angular frequency instructs,
In formula, kpRepresent frequency droop gain, the k of distributed generation resourceL_qUnder the inductive circuit voltage for representing distributed generation resource
Vertical gain, ω*Represent benchmark angular frequency, the V of distributed generation resource*Represent the reference voltage of distributed generation resource, ω represents distributed electrical
Sagging control angular frequency, the V in source represent the sagging control voltage of distributed generation resource；
After the voltage and angular frequency for obtaining output voltage, using fundamental voltage instruction and the difference of virtual impedance pressure drop as most
Whole voltage vector magnitude instruction will be used as final voltage vector angle command after angular frequency instruction integral:
In formula, VrefRepresent the final command voltage vector amplitude of distributed generation resource, θrefRepresent the final of distributed generation resource
Command voltage vector phase angle, V represent the sagging control voltage of distributed generation resource, ioRepresent the output electric current of distributed generation resource, Zvir
Distributed generation resource virtual impedance is represented, ω represents the sagging control angular frequency of distributed generation resource；
Preferably, outer ring PIR controller transmission function is as follows in step 4):
In formula, kpRepresent proportionality coefficient, kiRepresent integral coefficient, krRepresent resonance coefficient, ωoRepresent resonance angular frequency, ωc
Represent low pass cutoff angular frequency.
The present invention has following beneficial technical effect:
The present invention provides a kind of voltage source operating mode active filter control methods based on virtual impedance control, lead to
The virtual impedance of design distributed generation resource is crossed, realizes the inhibition to electric harmonic in micro-capacitance sensor.Which is surveyed with electric harmonic
It is low to measure link dependence, dynamic property is high, and hardware puts into low advantage.Improve micro-grid system power quality, improve micro- electricity
In terms of net system stability with good application prospect.
Detailed description of the invention
Fig. 1 voltage source operating mode distributed generation resource topology knot.
Fig. 2 voltage source operating mode distributed generation resource equivalent circuit.
Fig. 3 resonance characteristic Bode diagram.
The equivalent virtual impedance Bode diagram of Fig. 4.
Fig. 5 voltage source operating mode active filter control principle block diagram.
The harmonic wave equivalent circuit diagram of Fig. 6 voltage source operating mode current transformer access power grid.
Specific embodiment
The embodiment of the present invention is specifically described with reference to the accompanying drawing.A kind of voltage source based on virtual impedance control
Operating mode active filter control method includes implementation steps in detail below:
1) the humorous of link Bode diagram computing system the virtual impedance design of distributed generation resource resonance: is filtered according to distributed generation resource
Vibration frequency；The control of distributed generation resource is as shown in Figure 1, in figure, and L represents the side FMS filter inductance, Lo represents microgrid side filtered electrical
Sense, C represent filter capacitor, irefRepresent distributed generation resource instruction current, ioRepresent distributed generation resource output electric current, iLRepresent distribution
Formula power supply inductive current, icRepresent filter capacitor electric current, vPWMRepresent PWM command voltage, vCRepresent distributed generation resource filter capacitor
Pressure drop, vLoRepresent net side inductive drop, the v of distributed generation resourcemgRepresent microgrid access point voltage, the uv of distributed generation resourceinGeneration
The open loop dynamic output voltage of table distributed generation resource.
The equivalent open loop function of system as shown in Fig. 2, according to fig. 2 can computing system open-loop transfer function such as formula (1), base
It can get system open loop Bode diagram, computing system resonance frequency in formula (1).
K in formulaPWMRepresent PWM link equivalent gain, the G of distributed generation resourcei(s)Represent distributed generation resource current loop controller
Transmission function, L represent distributed electrical source filter inductance, LoRepresent microgrid side filter inductance, C represents filter capacitor.
2) according to circuit theory, 3 voltage source operating mode distributed electrical the virtual impedance control of resonance: can be obtained with reference to the accompanying drawings
The dynamic model of source equivalent circuit is described as follows:
In formula (2) and attached drawing 3, L represents filter inductance, C represents filter capacitor, LoRepresent ac bus side filter inductance, v
Represent output voltage, vinRepresent open loop consecutive mean output voltage, iLRepresent filter inductance electric current, i represents output electric current, u generation
The variable function that table switch state determines.
Being expressed as follows for the open loop consecutive mean output voltage of voltage source operating mode current transformer can be obtained by formula (1):
Since voltage source operating mode distributed generation resource mostly uses double-closed-loop control, it can be by uvinIt indicates are as follows:
V=avref-bi (4)
In formula, vrefFor command voltage, a is command voltage coefficient, and b is output current coefficient.
It is defined according to the Single port of circuit or two-port network, the equivalent circuit that can obtain the system is as shown in Fig. 4.Change
State output voltage uv can be changed in the feedback network transmission function of power transformation potential source operating mode distributed generation resourcein.Therefore, pass through
The resonance frequency equivalent impedance for increasing a bandreject filtering in feedback network to change realizes the active damping of system, band resistance filter
Shown in the transmission function of wave device such as formula (5):
In formula, ω0For bandpass filter resonance frequency, Q is quality factor；
3) voltage of distributed generation resource and frequency instruction calculate: distributed generation resource output voltage current first harmonics signal is extracted,
Calculate power supply active power of output and reactive power, calculation method such as formula (6), in formula, P represents the wattful power of distributed generation resource
Rate, Q represent the reactive power of distributed generation resource, vo_dRepresent d axis of the distributed generation resource output voltage under synchronous rotating frame
Component, vo_qRepresent q axis component of the distributed generation resource output voltage under synchronous rotating frame, io_dIt is defeated to represent distributed generation resource
D axis, i of the electric current under synchronous rotating frame outo_qRepresent q of the distributed generation resource output electric current under synchronous rotating frame
Axis component；
The fundamental voltage of distributed generation resource is calculated according to output power meter and angular frequency instructs, calculation method such as formula (7), formula
In, kpRepresent frequency droop gain, the k of distributed generation resourceL_qRepresent the sagging gain of inductive circuit voltage, the ω of distributed generation resource*
Represent benchmark angular frequency, the V of distributed generation resource*Represent the reference voltage of distributed generation resource, ω represents the sagging of distributed generation resource
Control angular frequency, V represent the sagging control voltage of distributed generation resource；
After the voltage and angular frequency for obtaining output voltage, using fundamental voltage instruction and the difference of virtual impedance pressure drop as most
Whole voltage vector magnitude instruction will be used as final voltage vector angle command, calculation method such as formula after angular frequency instruction integral
(8), in formula, VrefRepresent the final command voltage vector amplitude of distributed generation resource, θrefRepresent the final instruction of distributed generation resource
Voltage vector phase angle, V represent the sagging control voltage of distributed generation resource, ioRepresent the output electric current of distributed generation resource, ZvirIt represents
Distributed generation resource virtual impedance, ω represent the sagging control angular frequency of distributed generation resource；
4) the PCC current harmonics virtual impedance control of distributed generation resource: using outer ring PIR controller, inner ring P controller
Mode improves harmonic wave time equivalent impedance, and outer ring realizes that output voltage feedback control, inner ring realize output Current Feedback Control.PIR
Transmission function is as follows:
In formula, kpRepresent proportionality coefficient, kiRepresent integral coefficient, krRepresent resonance coefficient, ωoRepresent resonance angular frequency, ωc
Represent low pass cutoff angular frequency.
5) output voltage form, control electric power electricity distributed generation resource output voltage control: are calculated using SVPWM modulation system
Each device working condition in sub-device.
Voltage source operating mode active filter control method proposed by the present invention is as shown in Fig. 5.
The operation principle of the present invention is that:
When showing h power harmonic suppression using voltage source operating mode active filter, according to circuit superposition theorem, in h
Under subfrequency, voltage source operating mode distributed generation resource can be equivalent to h subharmonic voltage source and h subharmonic output impedance
Series connection (h subharmonic voltage control be 0), power grid is equivalent to h subharmonic impedance, the harmonic load of micro-capacitance sensor be equivalent to h times it is humorous
Wave current source.Therefore, the h subharmonic equivalent circuit that voltage source operating mode current transformer access power grid can be obtained is as shown in Figure 6:
If the equivalent total resistance of voltage source operating mode current transformer is Za_h(resistance Ra_h, inductance La_h, resultant admittance be
Ya_h), the route total impedance of power grid be Zg_h(resistance Rg_h, inductance Lg_h, admittance Yg_h), the output harmonic wave electric current of harmonic source is
iload_h, the harmonic current that voltage source operating mode current transformer is shared can be calculated according to Fig. 6 be expressed as follows:
By formula (10) as it can be seen that for voltage source operating mode current transformer, equivalent impedance value is smaller, and that bears is humorous
Wave electric current is bigger, and power grid then bears smaller harmonic current.Therefore, when voltage source operating mode converter harmonic impedance value is remote
When less than mains by harmonics time equivalent impedance value, the electric harmonic of micro-grid system will be mainly by voltage source operating mode current transformer
It shares, can effectively realize the inhibition of electric harmonic.
Claims (5)
1. a kind of voltage source operating mode active filter control method based on virtual impedance control, which is characterized in that the party
Method the following steps are included:
1) the virtual impedance design of distributed generation resource resonance: according to the resonance frequency of distributed power supply system Bode diagram computing system；
2) the virtual impedance control of resonance: acquisition distributed generation resource output voltage current signal extracts resonance frequency primary current, is based on
Resonance frequency primary current and active damping impedance product calculate virtual impedance pressure drop；
3) voltage of distributed generation resource and frequency instruction calculate: extracting distributed generation resource output voltage current first harmonics signal, calculate
Power supply active power of output and reactive power calculate the fundamental voltage and frequency instruction of distributed generation resource according to output power meter, will
Fundamental voltage instruction and the difference of virtual impedance pressure drop are as final voltage instruction；
4) the PCC current harmonics virtual impedance control of distributed generation resource: by the way of outer ring PIR controller, inner ring P controller
Improve harmonic wave time equivalent impedance, outer ring realizes that output voltage feedback control, inner ring realize output Current Feedback Control；
5) output voltage form, control power electronics dress distributed generation resource output voltage control: are calculated using SVPWM modulation system
Each device working condition in setting.
2. a kind of voltage source operating mode active filter controlling party as described in claim 1 based on virtual impedance control
Method, which is characterized in that system resonance frequencies G in step 1)i_o(s)Calculation are as follows:
In formula, kPWMRepresent PWM link equivalent gain, the G of distributed generation resourcei(s)Represent the transmitting of distributed generation resource current loop controller
Function, L represent distributed electrical source filter inductance, LoRepresent microgrid side filter inductance, C represents filter capacitor.
3. a kind of voltage source operating mode active filter controlling party as claimed in claim 2 based on virtual impedance control
Method, which is characterized in that
The concrete mode of the virtual impedance control of resonance in step 2) are as follows:
The dynamic model of voltage source operating mode distributed generation resource equivalent circuit is as follows:
In formula, v represents output voltage, vinRepresent open loop consecutive mean output voltage, iLRepresent filter inductance electric current, i represent it is defeated
The variable function that electric current, u representation switch state determine out；
The open loop consecutive mean output voltage of voltage source operating mode current transformer is expressed as follows:
By uvinIt indicates are as follows:
V=avref-bi
In formula, vrefFor command voltage, a is command voltage coefficient, and b is output current coefficient；
The transmission function of bandstop filter is as follows:
In formula, ω0For bandpass filter resonance frequency, Q is quality factor.
4. a kind of voltage source operating mode active filter controlling party as claimed in claim 3 based on virtual impedance control
Method, which is characterized in that the concrete mode that the voltage of distributed generation resource and frequency instruction calculate in step 3) are as follows:
Distributed generation resource output voltage current first harmonics signal is extracted, power supply active power of output and reactive power are calculated:
In formula, P represents the reactive power of distributed generation resource, v for the active power of distributed generation resource, Qo_dRepresent distributed generation resource
D axis component of the output voltage under synchronous rotating frame, vo_qDistributed generation resource output voltage is represented in synchronous rotating frame
Under q axis component, io_dRepresent d axis, i of the distributed generation resource output electric current under synchronous rotating frameo_qRepresent distributed electrical
Source exports q axis component of the electric current under synchronous rotating frame；
The fundamental voltage of distributed generation resource is calculated according to output power meter and angular frequency instructs,
In formula, kpRepresent frequency droop gain, the k of distributed generation resourceL_qRepresent the sagging increasing of inductive circuit voltage of distributed generation resource
Benefit, ω*Represent benchmark angular frequency, the V of distributed generation resource*Represent the reference voltage of distributed generation resource, ω represents distributed generation resource
Sagging control angular frequency, V represent the sagging control voltage of distributed generation resource.
After the voltage and angular frequency for obtaining output voltage, using fundamental voltage instruction and the difference of virtual impedance pressure drop as final electricity
Vector magnitude instruction is pressed, final voltage vector angle command will be used as after angular frequency instruction integral:
In formula, VrefRepresent the final command voltage vector amplitude of distributed generation resource, θrefRepresent the final instruction of distributed generation resource
Voltage vector phase angle, V represent the sagging control voltage of distributed generation resource, ioRepresent the output electric current of distributed generation resource, ZvirIt represents
Distributed generation resource virtual impedance, ω represent the sagging control angular frequency of distributed generation resource.
5. a kind of voltage source operating mode active filter controlling party as claimed in claim 4 based on virtual impedance control
Method, which is characterized in that outer ring PIR controller transmission function is as follows in step 4):
In formula, kpRepresent proportionality coefficient, kiRepresent integral coefficient, krRepresent resonance coefficient, ωoRepresent resonance angular frequency, ωcIt represents
Low pass cutoff angular frequency.
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| CN111049442A (en) * | 2019-11-25 | 2020-04-21 | 上海新时达机器人有限公司 | Method for suppressing rotational speed pulsation of servo motor |
| CN111313423A (en) * | 2019-11-27 | 2020-06-19 | 天津瑞能电气有限公司 | Optimized active power filter current linear control method |
| CN111431191A (en) * | 2020-03-06 | 2020-07-17 | 国网河南省电力公司电力科学研究院 | Inverter rotor angle droop control method and system based on virtual impedance |
| CN112448401A (en) * | 2020-12-15 | 2021-03-05 | 南方电网科学研究院有限责任公司 | Control method, device and equipment for improving transient power angle stability of virtual synchronous machine |
| CN115940153A (en) * | 2023-03-10 | 2023-04-07 | 四川大学 | Adaptive capacity adjusting method of active filter |
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| CN111049442A (en) * | 2019-11-25 | 2020-04-21 | 上海新时达机器人有限公司 | Method for suppressing rotational speed pulsation of servo motor |
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Application publication date: 20190308 |