CN109494755A - A kind of virtual synchronous generator no-voltage passes through control system and control method - Google Patents
A kind of virtual synchronous generator no-voltage passes through control system and control method Download PDFInfo
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- CN109494755A CN109494755A CN201910017701.9A CN201910017701A CN109494755A CN 109494755 A CN109494755 A CN 109494755A CN 201910017701 A CN201910017701 A CN 201910017701A CN 109494755 A CN109494755 A CN 109494755A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- Y02E40/30—Reactive power compensation
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Abstract
A kind of virtual synchronous generator control system of the invention and control method increase voltage detecting link on the basis of traditional virtual synchronous generator structure.Traditional virtual synchronous electric generator structure is improved first, increases voltage detecting link, the positive and negative order components in failure are separated using depression of order resonant regulator method, determine symmetric fault or asymmetric fault by judging the size of negative sequence voltage amplitude.The control strategy under symmetric fault and asymmetry is separately designed, the overcurrent due to caused by grid voltage sags is quickly inhibited using the method directly to feedover based on positive sequence voltage, while providing corresponding reactive power according to low voltage crossing technical requirements.The present invention realize grid voltage sags moment quickly inhibit the no-voltages crossing technology such as overcurrent and rapid compensating power requirement, no-voltage pass through be low voltage crossing limiting case, if low voltage crossing technical requirements certainly will be met by being able to achieve no-voltage and passing through.
Description
Technical field
The invention belongs to Multifunctional inverter control technology fields, and in particular to a kind of virtual synchronous generator control system
And control method.
Background technique
Due to a large amount of accesses of distributed energy, traditional grid-connected system has been unable to meet distributed generation system
Demand, inverter become the capital equipment of distributed grid-connected electricity generation system, the problem of so bringing be a large amount of electronic equipment to
The stable operation of electric system causes threat to a certain extent.In order to which the damping and the inertia that pass on conventional synchronization generator are big
The characteristics of, virtual synchronous machine algorithm is introduced into inverter by domestic and foreign scholars, that is, the electromechanical properties of synchronous generator are simulated, therefore
There is the research of virtual synchronous generator.Domestic and foreign scholars have done many researchs in virtual synchronous electrical generator fields, including
Structure improvement, parameter designing, people having the same aspiration and interest equivalence etc., but it is very few in the research of low voltage crossing technical aspect, due to distributed energy
Permeability gradually increase, if cutting out power grid in grid voltage sags, pole certainly will be caused to the stable operation of electric system
Big harm, so low voltage crossing technical requirements in grid voltage sags, will make system remain to maintain to be incorporated into the power networks until electricity
Net voltage restore, and no-voltage pass through be low voltage crossing a limit, if be able to satisfy no-voltage pass through certainly will meet it is low
Voltage ride-through technical requirements.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of virtual synchronous generator control system and control methods, no
Good inertia and Damper Braces can be only provided for power grid, flexibly participate in the frequency modulation and voltage modulation of system, it can also be in network voltage
Reactive power is provided rapidly to power grid when falling, and has low voltage ride-through capability.
The present invention provides a kind of virtual synchronous generator no-voltage and passes through control system, comprising: three-phase full-bridge inverter,
Firstorder filter, second-order filter, electric current positive-negative sequence separative unit, voltage positive-negative sequence separative unit, voltage magnitude detection are single
Member, VSG control unit, PI adjust unit and SPWM modulation unit；
Three-phase full-bridge inverter, firstorder filter and second-order filter are sequentially connected；Electric current positive-negative sequence separative unit
It acquires the transient current after second-order filter filtering and carries out the separation of dq transformation and positive-negative sequence current；Voltage positive-negative sequence point
The instantaneous voltage after second-order filter filtering is acquired from unit and carries out the separation of dq transformation and positive and negative sequence voltage；Voltage amplitude
Value detection unit is used to detect the amplitude of negative sequence voltage and chooses the active power for being input to VSG control unit according to testing result
Reference value and reactive power reference qref；VSG control unit acquires frequency, active power, reactive power and the instantaneous electricity of grid entry point
Pressure calculates acquisition grid phase angle and excitation electric gesture, grid phase angle and excitation electric gesture show that VSG is defeated after three-phase synthesizes
Voltage out, VSG output voltage are converted by dq, obtain d shaft voltage and q shaft voltage；D shaft voltage and the wink after positive-negative sequence separates
When d shaft voltage make the difference, q shaft voltage and the instantaneous q shaft voltage after positive-negative sequence separates make the difference, then respectively by PI adjust obtain d
Axis reference current and q axis reference current；D axis reference current and the instantaneous d shaft current after positive-negative sequence separates make the difference, the reference of q axis
Electric current and the instantaneous q shaft current after positive-negative sequence separates make the difference, then adjust by PI obtain the shaft end d voltage and the shaft end q electricity respectively
Pressure；The shaft end d voltage and the shaft end q voltage return to three phase full bridge by SPWM modulation after coordinate transform is converted to three phase terminals voltage
Inverter.
The present invention provides a kind of virtual synchronous generator no-voltage traversing control method, includes the following steps:
Step 1: acquisition is through filtered instantaneous voltage and transient current；
Step 2: dq transformation being carried out to instantaneous voltage and is separated with positive and negative sequence voltage, transient current progress dq is converted and positive and negative
Sequence current separation；
Step 3: detect the amplitude of negative sequence voltage and according to testing result judgement be symmetric fault or asymmetric fault, in turn
Choose active power reference value and reactive power reference qref；
Step 4: acquiring frequency, active power, reactive power and the instantaneous voltage of grid entry point, and according to the function power of selection
Reference value and reactive power reference qref, which calculate, obtains grid phase angle and excitation electric gesture；
Step 5: grid phase angle and excitation electric gesture are converted through three-phase synthesis and dq, obtain d shaft voltage and q shaft voltage；
Step 6:d shaft voltage and the instantaneous d shaft voltage after positive-negative sequence separates make the difference, and q shaft voltage and separate through positive-negative sequence
Instantaneous q shaft voltage afterwards makes the difference, then adjusts by PI obtain d axis reference current and q axis reference current respectively；
Step 7:d axis reference current and the instantaneous d shaft current after positive-negative sequence separates make the difference, q axis reference current and through just
Instantaneous q shaft current after negative phase-sequence separation makes the difference, then adjusts by PI obtain the shaft end d voltage and the shaft end q voltage respectively；
Step 8:d shaft end voltage and the shaft end q voltage return after coordinate transform is converted to three phase terminals voltage by SPWM modulation
Back to three-phase full-bridge inverter.
A kind of virtual synchronous generator control system provided by the invention and control method, are in traditional virtual synchronous generator
On the basis of machine structure, increases voltage detecting link, and design different control strategies for different faults type, reach power grid
Quickly inhibit overcurrent when Voltage Drop and reactive power is provided, system does not cut out power grid and remains to when realizing grid voltage sags
Maintenance is incorporated into the power networks.
The design mainly includes following sections content: improving traditional virtual synchronous electric generator structure first, increases electricity
Detection is pressed, the positive and negative order components in failure are separated using depression of order resonant regulator method, by judging negative sequence voltage
The size of amplitude determines symmetric fault or asymmetric fault.Then the control under symmetric fault and asymmetry is separately designed
Strategy quickly inhibits the overcurrent due to caused by grid voltage sags using the method directly to feedover based on positive sequence voltage, simultaneously
Corresponding reactive power is provided according to low voltage crossing technical requirements.For the inhibition ring of asymmetric fault design negative-sequence current
Section.By the above content, the present invention realizes grid voltage sags moment and quickly inhibits overcurrent and rapid compensating power
Etc. no-voltages crossing technology requirement, no-voltage pass through be low voltage crossing limiting case, be bound to if being able to achieve no-voltage and passing through
Meet low voltage crossing technical requirements.
It establishes on the basis of traditional virtual synchronous generator control strategy, not only compensates for the low inertia of inverter, low
The shortcomings that damping, can also be in grid voltage sags, can maintaining system, off-grid is not run, and quickly provides idle branch for system
Support, so that network voltage restores to reach grid-connected state again rapidly.
Detailed description of the invention
Fig. 1 is a kind of topology diagram of virtual synchronous generator control system of the invention；
Fig. 2 is the control block diagram that positive-negative sequence of the invention separates；
Fig. 3 is the control block diagram of the invention based on electric voltage feed forward；
Fig. 4 for institute's reference of the present invention low voltage crossing technical requirements figure.
Specific embodiment
Fig. 1 is a kind of topology diagram of virtual synchronous generator control system of the invention, comprising: three phase full bridge inversion
Device 1, firstorder filter 2, second-order filter 3, electric current positive-negative sequence separative unit 4, voltage positive-negative sequence separative unit 5, voltage
Amplitude detection unit 6, VSG control unit 7, the first PI adjust unit 8, the 2nd PI adjusts unit 9 and SPWM modulation unit 10.
Three-phase full-bridge inverter 1, firstorder filter 2 and second-order filter 3 are sequentially connected.Firstorder filter 2 wraps
Three inductance are included, have the function of removing current ripples.Second-order filter 3 is made of inductance and capacitor, and the effect of capacitor is
The high-frequency ac ingredient in output electric current is filtered out, the effect of inductance is the harmonic components removed in grid-connected current.
When grid voltage sags, acquired by electric current positive-negative sequence separative unit 4 through the filtered wink of second-order filter 3
When electric current and carry out dq transformation and positive-negative sequence current separation, isolate instantaneous d axis forward-order current and instantaneous q axis forward-order current.
By voltage positive-negative sequence separative unit 5 acquisition through the filtered instantaneous voltage of second-order filter 3 and carry out dq transformation and it is positive and negative
Instantaneous d axis positive sequence voltage and instantaneous q axis positive sequence voltage are isolated in the separation of sequence voltage.
Voltage magnitude detection unit 6, which is used to detect the amplitude of negative sequence voltage and chooses according to testing result, is input to VSG control
The active power reference value and reactive power reference qref of unit 7 processed.Frequency f, the wattful power of the acquisition grid entry point of VSG control unit 7
Rate P0, reactive power Q0With instantaneous voltage uabcIt calculates and obtains grid phase angle θ and excitation electric gesture u, grid phase angle θ and excitation
Electromotive force u obtains VSG output voltage U after three-phase synthesizesabc, VSG output voltage UabcIt is converted by dq, obtains d shaft voltage ud
With q shaft voltage uq；D shaft voltage udWith the instantaneous d shaft voltage u after positive-negative sequence separatesd++ud-It makes the difference, q shaft voltage uqWith through positive and negative
Instantaneous q shaft voltage u after sequence separationq++uq-It makes the difference, then is adjusted through the first PI obtain d axis reference current i respectivelydWith q axis with reference to electricity
Flow iq；D axis reference current idWith the instantaneous d shaft current i after positive-negative sequence separatesd++id-It makes the difference, q axis reference current iqWith through just
Instantaneous q shaft current i after negative phase-sequence separationq++iq-It makes the difference, then is adjusted by the 2nd PI obtain the shaft end d voltage u respectivelyd *With the shaft end q
Voltage uq *；The shaft end d voltage ud *With the shaft end q voltage uq *By SPWM modulation unit after coordinate transform is converted to three phase terminals voltage
10 return to three-phase full-bridge inverter 1.
When voltage magnitude detection unit 6 detects the amplitude of negative sequence voltage close to zero, then it can determine whether have for symmetric fault
2 points of the reference value access of function power, 1 point of the reference value access of reactive power, active power reference value and reactive power reference qref,
It calculates according to the following formula:
Wherein, QmaxFor reactive power maximum value, S is apparent energy, PrefFor active power reference value, uinvIt is complete for three-phase
Bridge inverter output voltage, ugFor network voltage, θ is grid phase angle, and X is line impedance；
When detecting the amplitude of negative sequence voltage much larger than zero, then can determine whether as asymmetric fault, the reference of active power
The reference value of 3 points of value access, reactive power accesses at 2 points, then provides correspondingly reactive power, active power reference value for system
And reactive power reference qref, it calculates according to the following formula:
Wherein, P0For active power, For the instantaneous d axis positive sequence electricity after positive-negative sequence separates
Pressure,For the instantaneous q axis positive sequence voltage after positive-negative sequence separates.
A kind of virtual synchronous generator no-voltage traversing control method of the invention, includes the following steps:
Step 1: acquisition is through filtered instantaneous voltage and transient current；
Step 2: dq transformation being carried out to instantaneous voltage and is separated with positive and negative sequence voltage, transient current progress dq is converted and positive and negative
Sequence current separation；
Fig. 2 is the control block diagram that positive-negative sequence of the invention separates, and the present invention is using depression of order resonant regulator (abbreviation ROR) point
From.ROR adjuster can quickly and accurately isolate positive and negative order components, and realize relatively flexibly simpler.As K is ROR tune in Fig. 2
With saving device gain coefficient determines positive-negative sequence discretely speed.
The transmission function of depression of order resonant regulator are as follows:
Step 3: detect the amplitude of negative sequence voltage and according to testing result judgement be symmetric fault or asymmetric fault, in turn
Choose active power reference value and reactive power reference qref；The step 3 specifically:
When voltage magnitude detection unit detects the amplitude of negative sequence voltage close to zero, then it can determine whether have for symmetric fault
Function value and power reference and reactive power reference qref calculate according to the following formula:
Wherein, QmaxFor reactive power maximum value, S is apparent energy, PrefFor active power reference value, uinvIt is complete for three-phase
Bridge inverter output voltage, ugFor network voltage, θ is grid phase angle, and X is line impedance；
When detecting the amplitude of negative sequence voltage much larger than zero, then can determine whether as asymmetric fault, active power reference value
And reactive power reference qref, it calculates according to the following formula:
Wherein, P0For active power, For the instantaneous d axis positive sequence electricity after positive-negative sequence separates
Pressure,For the instantaneous q axis positive sequence voltage after positive-negative sequence separates.
Step 4: acquiring frequency, active power, reactive power and the instantaneous voltage of grid entry point, and according to the function power of selection
Reference value and reactive power reference qref, which calculate, obtains grid phase angle and excitation electric gesture；
Step 5: grid phase angle and excitation electric gesture are converted through three-phase synthesis and dq, obtain d shaft voltage and q shaft voltage；
Step 6:d shaft voltage and the instantaneous d shaft voltage after positive-negative sequence separates make the difference, and q shaft voltage and separate through positive-negative sequence
Instantaneous q shaft voltage afterwards makes the difference, then adjusts by PI obtain d axis reference current and q axis reference current respectively；
Step 7:d axis reference current and the instantaneous d shaft current after positive-negative sequence separates make the difference, q axis reference current and through just
Instantaneous q shaft current after negative phase-sequence separation makes the difference, then adjusts by PI obtain the shaft end d voltage and the shaft end q voltage respectively；
Step 8:d shaft end voltage and the shaft end q voltage return after coordinate transform is converted to three phase terminals voltage by SPWM modulation
Back to three-phase full-bridge inverter.
Fig. 3 is the control block diagram of the invention based on electric voltage feed forward, and the introducing of electric voltage feed forward can accelerate system response speed
Degree is eliminated and is disturbed because of grid disturbance to grid-connected current bring, while can mitigate feedback control burden, and pi regulator parameter is made
Smaller, enhancing system stability can be obtained.
Fig. 4 for institute's reference of the present invention low voltage crossing technical requirements figure, when photo-voltaic power generation station grid entry point voltage falls to 0,
Photo-voltaic power generation station should be able to not off-grid continuous operation 0.15s；When photo-voltaic power generation station grid entry point voltage falls to 1 or less curve, photovoltaic electric
Standing can cut out from power grid.
The present invention improves the structure of traditional virtual synchronous generator, increases voltage magnitude detection unit 6, when network voltage falls
When falling, the separation of positive and negative order components is carried out using depression of order resonant regulator.
For phase three-wire three circuit, zero-sequence component is not present.Acquire the instantaneous voltage u of grid entry pointabc, transient current iabc,
T is carried out to instantaneous voltage, transient current respectively3s/2s(i.e. Clarke transformation) transformation,Wherein
The isolated u of positive-negative sequence is carried out using ROR adjusterαβ +、uαβ -、iαβ +、iαβ -, to the positive and negative order components after separation
uαβ +、uαβ -、iαβ +、iαβ -Carry out T2s/2r(i.e. Park transformation) transformation, wherein
Fault type is judged by positive-negative sequence separation and voltage magnitude detection unit, judges the size of negative sequence voltage amplitude,
If amplitude is similar to zero, for symmetric fault；If amplitude is much larger than zero, for asymmetric fault.Take corresponding control
Strategy inhibits the compensation with reactive power including quick overcurrent.
Symmetric fault strategy, using voltage feedforward control is based on, can be eliminated to avoid overcurrent caused by Voltage Drop
Because of grid disturbance bring current fluctuation problem.According to low voltage crossing technical requirements, the ginseng of active power during failure is set
Examining value isReactive power unconfined cannot increase, and there is following constraint on capacity with active power
Condition, according to the limitation of active power reactive power,Under normal circumstances, inverter allow in short-term with
The operation of 1.1~1.15 times of apparent energy obtains the ginseng of reactive power during failure so in order to reach Quick reactive-load compensation purpose
Examining value is
Asymmetric fault strategy, using voltage feedforward control is based on, can disappear to avoid overcurrent caused by Voltage Drop
Except because of grid disturbance bring current fluctuation problem.According to low voltage crossing technical requirements, active power during failure is set
Reference value isReactive power unconfined cannot increase, and there is following constraint item on capacity with active power
Part, according to the limitation of active power reactive powerUnder normal circumstances, inverter allows in short-term with 1.1
The operation of~1.15 times of apparent energy obtains the reference of reactive power during failure so in order to reach Quick reactive-load compensation purpose
Value is
The foregoing is merely presently preferred embodiments of the present invention, the thought being not intended to limit the invention, all of the invention
Within spirit and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of virtual synchronous generator no-voltage passes through control system characterized by comprising three-phase full-bridge inverter,
Firstorder filter, second-order filter, electric current positive-negative sequence separative unit, voltage positive-negative sequence separative unit, voltage magnitude detection are single
Member, VSG control unit, PI adjust unit and SPWM modulation unit；
Three-phase full-bridge inverter, firstorder filter and second-order filter are sequentially connected；The acquisition of electric current positive-negative sequence separative unit
Transient current after second-order filter filtering and the separation for carrying out dq transformation and positive-negative sequence current；The separation of voltage positive-negative sequence is single
Member acquires the instantaneous voltage after second-order filter filtering and carries out the separation of dq transformation and positive and negative sequence voltage；Voltage magnitude inspection
Unit is surveyed to be used to detect the amplitude of negative sequence voltage and choose the active power reference for being input to VSG control unit according to testing result
Value and reactive power reference qref；Frequency, active power, reactive power and the instantaneous voltage meter of VSG control unit acquisition grid entry point
It calculates and obtains grid phase angle and excitation electric gesture, grid phase angle and excitation electric gesture obtain VSG output electricity after three-phase synthesizes
Pressure, VSG output voltage are converted by dq, obtain d shaft voltage and q shaft voltage；D shaft voltage and the instantaneous d after positive-negative sequence separates
Shaft voltage makes the difference, and q shaft voltage and the instantaneous q shaft voltage after positive-negative sequence separates make the difference, then adjusts by PI obtain d axis ginseng respectively
Examine electric current and q axis reference current；D axis reference current and the instantaneous d shaft current after positive-negative sequence separates make the difference, q axis reference current
It is made the difference with the instantaneous q shaft current after positive-negative sequence separates, then is adjusted by PI obtain the shaft end d voltage and the shaft end q voltage respectively；d
Shaft end voltage and the shaft end q voltage return to three phase full bridge inversion by SPWM modulation after coordinate transform is converted to three phase terminals voltage
Device.
2. virtual synchronous generator no-voltage as described in claim 1 passes through control system, which is characterized in that work as voltage magnitude
It when detection unit detects the amplitude of negative sequence voltage close to zero, then can determine whether as symmetric fault, active power reference value and idle
Value and power reference calculates according to the following formula:
Wherein, QmaxFor reactive power maximum value, S is apparent energy, PrefFor active power reference value, uinvIt is inverse for three phase full bridge
Become device output voltage, ugFor network voltage, θ is grid phase angle, and X is line impedance；
When detecting the amplitude of negative sequence voltage much larger than zero, then can determine whether as asymmetric fault, active power reference value and nothing
Function value and power reference calculates according to the following formula:
Wherein, P0For active power, For the instantaneous d axis positive sequence voltage after positive-negative sequence separates,
For the instantaneous q axis positive sequence voltage after positive-negative sequence separates.
3. a kind of virtual synchronous generator no-voltage traversing control method, which comprises the steps of:
Step 1: acquisition is through filtered instantaneous voltage and transient current；
Step 2: dq transformation being carried out to instantaneous voltage and is separated with positive and negative sequence voltage, dq transformation and positive-negative sequence electricity are carried out to transient current
Flow separation；
Step 3: detecting the amplitude of negative sequence voltage and judge it is symmetric fault or asymmetric fault according to testing result, and then choose
Active power reference value and reactive power reference qref；
Step 4: acquiring frequency, active power, reactive power and the instantaneous voltage of grid entry point, and according to the function power reference of selection
Value and reactive power reference qref, which calculate, obtains grid phase angle and excitation electric gesture；
Step 5: grid phase angle and excitation electric gesture are converted through three-phase synthesis and dq, obtain d shaft voltage and q shaft voltage；
Step 6:d shaft voltage and the instantaneous d shaft voltage after positive-negative sequence separates make the difference, q shaft voltage and after positive-negative sequence separates
Instantaneous q shaft voltage makes the difference, then adjusts by PI obtain d axis reference current and q axis reference current respectively；
Step 7:d axis reference current and the instantaneous d shaft current after positive-negative sequence separates make the difference, q axis reference current and through positive-negative sequence
Instantaneous q shaft current after separation makes the difference, then adjusts by PI obtain the shaft end d voltage and the shaft end q voltage respectively；
Step 8:d shaft end voltage and the shaft end q voltage return to after coordinate transform is converted to three phase terminals voltage by SPWM modulation
Three-phase full-bridge inverter.
4. virtual synchronous generator no-voltage traversing control method as claimed in claim 3, which is characterized in that the step 3
Specifically:
When voltage magnitude detection unit detects the amplitude of negative sequence voltage close to zero, then can determine whether as symmetric fault, wattful power
Rate reference value and reactive power reference qref calculate according to the following formula:
Wherein, QmaxFor reactive power maximum value, S is apparent energy, PrefFor active power reference value, uinvIt is inverse for three phase full bridge
Become device output voltage, ugFor network voltage, θ is grid phase angle, and X is line impedance；
When detecting the amplitude of negative sequence voltage much larger than zero, then can determine whether as asymmetric fault, active power reference value and nothing
Function value and power reference calculates according to the following formula:
Wherein, P0For active power, For the instantaneous d axis positive sequence voltage after positive-negative sequence separates,
For the instantaneous q axis positive sequence voltage after positive-negative sequence separates.
5. virtual synchronous generator no-voltage traversing control method as claimed in claim 3, which is characterized in that the step 2
In based on depression of order resonant regulator carry out positive-negative sequence separation, the transmission function of depression of order resonant regulator are as follows:
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| CN110571849A (en) * | 2019-08-20 | 2019-12-13 | 南京国电南自电网自动化有限公司 | Rapid control method for responding to power instruction by virtual synchronous machine |
| CN111725837A (en) * | 2020-06-18 | 2020-09-29 | 浙江大学 | Low voltage ride through method and device for DFIG virtual synchronous machine, electronic equipment and medium |
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| CN113595093A (en) * | 2021-07-19 | 2021-11-02 | 南方电网科学研究院有限责任公司 | Reactive voltage automatic control method and device for new energy power station and storage medium |
| CN113765149A (en) * | 2021-10-18 | 2021-12-07 | 国网福建省电力有限公司莆田供电公司 | Pre-synchronization control method of inverter under unbalanced main power grid voltage |
| CN113765149B (en) * | 2021-10-18 | 2023-09-22 | 国网福建省电力有限公司莆田供电公司 | Presynchronization control method for inverter under unbalanced voltage of main power grid |
| CN114142477A (en) * | 2021-11-24 | 2022-03-04 | 国网湖南省电力有限公司 | Three-phase zero-voltage ride through reactive current calculation method and system based on voltage section continuation |
| CN114142477B (en) * | 2021-11-24 | 2023-08-15 | 国网湖南省电力有限公司 | Three-phase zero voltage ride through reactive current calculation method and system based on voltage section prolongation |
| CN114069709A (en) * | 2021-11-25 | 2022-02-18 | 福州大学 | Low voltage ride through comprehensive control method for virtual synchronous machine |
| CN114069709B (en) * | 2021-11-25 | 2023-09-08 | 厦门力景新能源科技有限公司 | Virtual synchronous machine low voltage ride through comprehensive control method |
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Application publication date: 20190319 |