CN106208138B - It is a kind of based on the distributed generation resource of virtual impedance without ac sensor control method - Google Patents
It is a kind of based on the distributed generation resource of virtual impedance without ac sensor control method Download PDFInfo
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- CN106208138B CN106208138B CN201610653100.3A CN201610653100A CN106208138B CN 106208138 B CN106208138 B CN 106208138B CN 201610653100 A CN201610653100 A CN 201610653100A CN 106208138 B CN106208138 B CN 106208138B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000007665 sagging Methods 0.000 claims abstract description 11
- 238000013016 damping Methods 0.000 claims abstract description 9
- 238000011217 control strategy Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000005611 electricity Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
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- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
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- 235000008434 ginseng Nutrition 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
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Classifications
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a kind of based on the distributed generation resource of virtual impedance without ac sensor control method, it is adapted to the grid-connected and isolated island double mode operation of micro-capacitance sensor, in micro-grid connection operation, it joined virtual impedance control on the basis of sagging control, Control system resolution and stability are not influenced by mains by harmonics in the case where being not necessarily to voltage sensor；In micro-capacitance sensor isolated operation, by being further improved virtual impedance and active damping method being added, so that nonlinear load and LCL be inhibited to filter harmonic wave interference caused by link, while the problem of filter resonates is avoided.The control method proposed through the invention reduces the computation burden of system cost and control system, improves the accuracy and stability of control system in the case of harmonic wave interference, has great significance for the further genralrlization of distributed power generation and micro-capacitance sensor.
Description
Technical field
The invention belongs to the technical field of distributed generation resource control more particularly to a kind of distributed electricals based on virtual impedance
Source is without ac sensor control method.
Background technique
It is generally believed that distributed power generation DG (Distribute Generation), which refers to, meets the specific needs of user, support
Existing power distribution network economical operation meets these two aspects requirement simultaneously, at user scene or close to the function of user's situ configuration
Rate is small-sized, the generating set with environmental compatible, thus proposes the concept of micro-capacitance sensor, micro-capacitance sensor refer to by distributed generation resource,
The small-sized electric system of the compositions such as energy storage device, energy conversion device, load, monitoring and protective device.Micro-capacitance sensor is one
It can be realized self-contr ol, protection and the autonomous system of management, can both be incorporated into the power networks with external electrical network, fortune can also be isolated
Row.The it is proposed of micro-capacitance sensor aims at flexible, the efficient application of distributed generation resource, solves substantial amounts, various informative distribution
Formula power grid problem.
In the past, the distributed generation resource output current or voltage in micro-capacitance sensor was realized same by phaselocked loop and external electrical network voltage
Step, needs accurately to measure the voltage at distributed generation resource grid entry point under this control strategy, passes through AC voltage sensor
The synchronous phase angle of voltage is detected, it is still, at high cost using alternating voltage sampling, and the operation of distributed electrical source control system is negative
Load is big；Measurement and the phaselocked loop that alternating voltage can be effectively reduced according to alternating voltage sensorless control strategy, drop simultaneously
The computation burden of low distributed electrical source control system.In the prior art, the control strategy without voltage sensor is had existed,
Application No. is the patents of CN201010109338.2 to propose the direct Power Control of grid-connected inverter without non-AC voltage sensor
Method.
But the direct Power Control method of grid-connected inverter without non-AC voltage sensor described in above patent document,
Have the following disadvantages: the control method of the patent is substantially that the algorithm for obtaining network voltage and phase indirectly is utilized,
And algorithm is complicated, amount of calculation is big；In addition, the method that the patent is mentioned is more sensitive for mains by harmonics interference, if electric
When accessing the biggish load of percent harmonic distortion in net, the accuracy and stability of system control can all be affected.Meanwhile it being distributed
Formula power supply increasingly payes attention to adapting to the needs of the double mode operation of micro-grid connection and isolated island, under isolated operation mode, microgrid
Interior distributed generation resource needs to provide voltage support and resists the influence of nonlinear load harmonic.
Summary of the invention
The present invention to solve the above-mentioned problems, propose it is a kind of based on the distributed generation resource of virtual impedance without ac sensor
Control method, effectively solve micro-capacitance sensor under the operation of grid-connected and isolated island double mode using AC voltage sensor and phaselocked loop at
The problem of this height, control system operand is big and alternating voltage computational accuracy is influenced by power grid or load harmonic.
To achieve the goals above, the present invention adopts the following technical scheme:
It is a kind of based on the distributed generation resource of virtual impedance without ac sensor control method, comprising the following steps:
(1): the power control link of distributed generation resource: passing through active power-frequency and the control of reactive power-voltage magnitude
Link processed obtains the reference frequency f of system current periodrefWith reference voltage amplitude Eref, then through sinusoidal signal generator obtain base
Quasi- voltage
(2): voltage control loop section: detecting the output electric current I of distributed generation resource first1, using the control based on virtual impedance
System strategy, obtains PWM reference voltage
(3): passing through the reference voltage in current period step (1)With the output electric current I in step (2)1It calculates next
The distributed generation resource active power of output P in periodDGAnd reactive power QDG, for the active power-in next cycle step (1)
The calculating of frequency and reactive power-voltage magnitude controlling unit.
In the step (1), specific steps include:
(1-1): under micro-grid connection operational mode, the power control link of distributed generation resource passes through active power-frequency
Rate and the sagging control of reactive power-voltage magnitude can obtain the reference frequency f of system current periodrefWith reference voltage width
Value Eref:
fref=DP(Pref-PDG)
Wherein, PrefAnd QrefFor the reference value of active power and reactive power, set according to the capacity of distributed generation resource
It sets；DPFor active power-frequency proportionality coefficient；DqAnd KiFor reactive power-voltage magnitude proportionality coefficient and integral coefficient；
PDGAnd QDGFor the real-time active power and reactive power of distributed generation resource output；frefAnd ErefFor benchmark voltageFrequency
And amplitude, reference voltage is generated through sinusoidal signal generator
(1-2): under micro-capacitance sensor isolated operation mode, distributed generation resource power control link passes through active power-frequency
The reference frequency f of system current period can be obtained with the sagging control of reactive power-voltage magnituderefWith reference voltage amplitude
Eref:
fref=DP·PDG
Eref=Dq·QDG
Wherein, DPFor active power-frequency proportionality coefficient；DqFor reactive power-voltage magnitude proportionality coefficient；PDGWith
QDGFor the real-time active power and reactive power of distributed generation resource output；frefAnd ErefFor benchmark voltageFrequency and width
Value, generates reference voltage through sinusoidal signal generator
In the step (2), the specific steps using the control strategy based on virtual impedance include:
(2-1) under micro-grid connection operational mode, the voltage control loop section of distributed generation resource is controlled using virtual impedance
Strategy obtains the harmonic wave of specific times by resonance harmonic current observer, empty by connecting in distributed generation resource outlet side
Quasi- resistance calculates PWM reference voltage:
Wherein, I1To export electric current, h is the number of harmonic wave, Rv,hFor the virtual resistance on h subharmonic, ωcFor cutoff frequency
Rate, ωoFor output voltage frequency, ωo=2 π 50=100 π rad/s；
(2-2) under micro-capacitance sensor isolated operation mode, the voltage control loop section of distributed generation resource is controlled using virtual impedance,
The voltage drop that virtual impedance generatesFor
R in formulav,hThe virtual resistance for being h for overtone order, Lv,hThe virtual reactance for being h for overtone order.
For the resonance problem for avoiding LCL filter, a suitable high-frequency gain is generated using active damping theory
RADActive damping when for high frequency, ωHPFFor the cutoff frequency of high-pass filter, I1For the output electricity of current period
Stream.
Finally, the PWM reference voltage after improved are as follows:
In the step (3), PDGAnd QDGFor the active power and reactive power of distributed generation resource output, calculation formula
Are as follows:
Wherein,And I1_delayThe reference voltage and output electric current of a respectively upper calculating cycle.
The invention has the benefit that
(1) the distributed electrical operated control method is applicable to be incorporated into the power networks mode and the decoupled mode of micro-capacitance sensor.It is micro-
When power grid is incorporated into the power networks, voltage magnitude and phase still can be accurately calculated in the case where mains by harmonics compares serious conditions, realize energy
Enough realize load reasonable distribution between distributed generation resource；Under micro-capacitance sensor isolated operation mode, it is capable of providing accurate voltage
Support and resist the influence of nonlinear load harmonic.
(2) distributed electrical source control system is sampled without alternating voltage, can save alternating voltage detection part and locking phase
Ring reduces costs, reduces the computational burden of control system.
(3) distributed generation resource voltage control loop section is controlled using virtual impedance, is equivalent in physical characteristic in distribution
Appropriate impedance of having connected in power supply output harmonic wave frequency range guarantees so that distributed generation resource has good anti-harmonic wave interference ability
The stability and accuracy of control system.
(4) in isolated operation, by being further improved virtual impedance and active damping method being added, to inhibit load
And it is interfered caused by LCL filtering link, and avoid the problem of filter resonates.
Detailed description of the invention
Fig. 1 is the micro-capacitance sensor structural schematic diagram containing more distributed generation resources；
Fig. 2 (a) is single distributed generation resource circuit diagram under micro-grid connection mode；
Fig. 2 (b) is single distributed generation resource Control system architecture block diagram under micro-grid connection mode；
Fig. 3 (a) is two distributed generation resource circuit diagrams under micro-capacitance sensor island mode；
Fig. 3 (b) is two distributed generation resource Control system architecture block diagrams under micro-capacitance sensor island mode；
Fig. 4 (a) is the simulation waveform of distributed generation resource under micro-grid connection mode；
Fig. 4 (b) is the simulation waveform that virtual impedance distributed generation resource is not added under micro-grid connection mode；
Fig. 4 (c) is the simulation waveform that virtual impedance distributed generation resource is added under micro-grid connection mode；
Fig. 5 (a) is the simulation waveform of distributed generation resource under micro-capacitance sensor island mode；
Fig. 5 (b) is the simulation waveform that virtual impedance distributed generation resource is not added under micro-capacitance sensor island mode；
Fig. 5 (c) is the simulation waveform that virtual impedance distributed generation resource is added under micro-capacitance sensor island mode.
Specific embodiment:
The invention will be further described with embodiment with reference to the accompanying drawing.
As shown in Figure 1, when static switch closure, micro-grid connection is run micro-capacitance sensor structure containing more distributed generation resources,
Micro-capacitance sensor is fed to bulk power grid；When bulk power grid breaks down, static switch is disconnected, and micro-capacitance sensor independent operating passes through distribution
Load power supply of the power supply into micro-capacitance sensor.However, nonlinear-load can generate harmonic wave, shadow when powering to micro-capacitance sensor internal loading
The power quality for ringing control system, will affect the stability of system when serious.Therefore a kind of control method is needed, is adapted in micro- electricity
Run under the grid-connected and isolated island double mode of net, without AC voltage sensor and alternating voltage computational accuracy not by power grid or
The influence of load harmonic, and distributed power supply system input cost is reduced, the adverse effect of resisting harmonic improves system operation
Stability；When micro-grid connection is run, voltage magnitude and phase still can be accurately calculated in the case where mains by harmonics compares serious conditions
Position, realization can be realized load reasonable distribution between distributed generation resource；Under micro-capacitance sensor isolated operation mode, it is capable of providing essence
True voltage support and the influence for resisting nonlinear load harmonic.
It is a kind of based on the distributed generation resource of virtual impedance without ac sensor control method, comprising the following steps:
(1): the power control link of distributed generation resource passes through active power-frequency and the control of reactive power-voltage magnitude
Link processed can obtain the reference frequency f of system current periodrefWith reference voltage amplitude Eref, then can through sinusoidal signal generator
Obtain instantaneous reference voltage
(2): voltage control loop section obtains PWM reference voltage using the control strategy based on virtual impedance
(3): being exported by the distributed generation resource that the voltage reference value and output current value of current period calculate next period
Active-power PDGAnd reactive power QDG, be used for next period the step of (1) in active power-frequency and reactive power-voltage
The controlling unit of amplitude.
The power control link of the distributed generation resource of step (1) and the voltage control loop section of step (2) are respectively divided into micro- electricity
In terms of when net is incorporated into the power networks and two when micro-capacitance sensor isolated operation:
Micro-grid connection of the present invention shown in typical equivalent circuit structure such as Fig. 2 (a) of single distributed generation resource, is divided when running
The single-phase inversion full-bridge topology that cloth power supply is made of four power switching modules, distributed generation resource are connected by LCL filter
It is connected to points of common connection PoC to be connected with bulk power grid, LCL filter is by filter inductance L2, filter resistance R2, filter capacitor CfComposition.
V in Fig. 2 (a)dcIt is DC voltage, VPWMIt is pwm voltage, VcIt is filter capacitor voltage, I1It is distributed generation resource
Export electric current, I2It is filter inductance electric current, CB is static switch, VgridIt is network voltage.This method only has detected distributed generation resource
Output electric current I1With DC voltage Vdc, compared to traditional method, without detecting the output voltage of distributed generation resource.
Under power grid grid-connect mode of the present invention shown in single distributed generation resource Control system architecture block diagram such as Fig. 2 (b), in micro- electricity
Under net grid-connect mode:
(1) power control link can be obtained by active power-frequency and the sagging control of reactive power-voltage magnitude
The reference frequency f of system current periodrefWith reference voltage amplitude Eref:
fref=DP(Pref-PDG)
Wherein, frefAnd ErefFor benchmark voltageFrequency and amplitude, generate reference voltage through sinusoidal signal generator
PrefAnd QrefFor the reference value of active power and reactive power, can be set according to the capacity of distributed generation resource
It sets；DPFor active power-frequency proportionality coefficient；DqAnd KiFor reactive power-voltage magnitude proportionality coefficient and integral coefficient；
PDGAnd QDGFor distributed generation resource output real-time active power and reactive power, its calculation formula is:
Wherein,And I1_delayThe reference voltage value and output current value of a respectively upper calculating cycle.
Through the above steps, active power and reactive power can be obtained by way of low cost, and does not need to survey
Measure alternating voltage.
(2) in order to avoid mains by harmonics is to the adverse effect of control system Stability and veracity, voltage control loop section is adopted
With virtual impedance control strategy, the harmonic wave of specific times is obtained by resonance harmonic current observer, by distributed electrical
Source outlet side connects virtual resistance to calculate PWM reference voltage:
Wherein, Rv,hFor the virtual resistance on h subharmonic, ωcFor cutoff frequency.
It is controlled by virtual impedance, is equivalent in physical characteristic and connects in the harmonic wave frequency range of distributed generation resource output
Suitable impedance ensure that the stability and standard of control system so that distributed generation resource has good anti-harmonic wave interference ability
True property.
The present invention takes two distributed generation resources in micro-capacitance sensor to be analyzed as typical structure, allusion quotation under micro-capacitance sensor mode
Shown in type equivalent circuit structure such as Fig. 3 (a), the single-phase inversion full-bridge that distributed generation resource is made of four power switching modules is opened up
It flutters, distributed generation resource is connected by LCL filter with load, and Load load is the nonlinear load in micro-capacitance sensor, in isolated island mould
A large amount of nonlinear load harmonic LCL filters can be generated under formula by filter inductance L2, filter resistance R2, filter capacitor CfComposition.Figure
V in 3 (a)dcIt is DC voltage, VPWMIt is pwm voltage, VcIt is filter capacitor voltage, I1It is filter inductance electric current, I1
It is the output electric current of distributed generation resource simultaneously, CB is static switch, ILoadIt is load current.Method of the invention still only detects
The output electric current and DC voltage of distributed generation resource, compared to traditional method, without detecting the output voltage of distributed generation resource.
Under power grid island mode of the present invention shown in two distributed generation resource Control system architecture block diagram such as Fig. 3 (b), in micro- electricity
Under net island mode:
(1) power control link can be obtained by active power-frequency and the sagging control of reactive power-voltage magnitude
The reference frequency f of system current periodrefWith reference voltage amplitude Eref:
fref=DP·PDG
Eref=Dq·QDG
Wherein, frefAnd ErefFor benchmark voltageFrequency and amplitude, generate reference voltage through sinusoidal signal generator
DPFor active power-frequency proportionality coefficient；DqFor reactive power-voltage magnitude proportionality coefficient；PDGAnd QDGFor
The real-time active power and reactive power of distributed generation resource output, its calculation formula is:
Wherein,And I1_delayThe voltage reference value and output current value of a respectively upper calculating cycle.
Through the above steps, active power and reactive power can be obtained by way of low cost, and does not need to survey
Measure alternating voltage.
(2) in order to avoid nonlinear load harmonic is to the adverse effect of control system Stability and veracity, voltage control
Link is controlled using virtual impedance, the voltage drop that virtual impedance generatesAre as follows:
R in formulav,hThe virtual resistance for being h for overtone order, Lv,hThe virtual reactance for being h for overtone order.
For the resonance problem for avoiding LCL filter, a suitable high-frequency gain is generated using active damping theory
RADActive damping when for high frequency, ωHPFFor the cutoff frequency of high-pass filter.
Finally, the PWM reference voltage after improved are as follows:
It is controlled by virtual impedance, is equivalent in physical characteristic and connects in the harmonic wave frequency range of distributed generation resource output
Suitable impedance ensure that the stability and standard of control system so that distributed generation resource has good anti-harmonic wave interference ability
True property.Active damping is added, avoids the resonance problem of LCL filter.
After the calculating for completing the above a cycle, under being calculated by the voltage reference value and output current value of current period
The active-power P of the distributed generation resource output in one periodDGAnd reactive power QDG:
Wherein,And I1delayThe voltage reference value and output current value of a respectively upper calculating cycle.
The present invention passes through the correctness and validity of verification experimental verification this method:
The simulation model as shown in Fig. 2 (a), Fig. 3 (a), main circuit and control system ginseng are built with Matlab/simulink
See Table 1 for details for number.
| Circuit parameter | Numerical value |
| Power grid voltage rating | 220V/50HZ |
| DC voltage | 450V |
| LCL filters link | L2==6.5MH；R2=8M Ω；Cf=6UF； |
| Control parameter | Numerical value |
| Switching frequency | 10KHZ |
| Resonance filter cutoff frequency | ωc=2.5RAD/S |
| Rv,h(grid-connect mode) | 50Ω |
| Sagging control (grid-connect mode) | DP=1/500；DP=1/1500；Ki=1/500 |
| Rv,h(island mode) | 1Ω |
| Lv,h(island mode) | 5MH |
Table 1
Fig. 4 (a), Fig. 4 (b) and Fig. 4 (c) are the simulation waveform of distributed power supply system under micro-grid connection mode.
Fig. 4 (a) is the simulation waveform in the time of 0.5s to 5s, sagging control is only utilized in the initial stage, in 0.6s
When be added virtual impedance link, in 3.5s, active power more changes to 3500W from 2500W.It can be obtained by Fig. 3 (a), virtual impedance is not
Lead to any apparent transient current, and the dynamic response of power control is rapid.
Fig. 4 (b) and Fig. 4 (c) is to pass through in the amplified figure of waveform not plus after virtual impedance and addition virtual impedance
As a result comparison can be obtained plus before virtual impedance link the THD of line current is not 11.41%, and THD is 4.36% after addition.
Fig. 5 (a), Fig. 5 (b) and Fig. 5 (c) are the simulation waveform of parallel connection distributed power supply system under micro-capacitance sensor island mode
Figure.
Fig. 5 (a) shows waveform when isolated operation.It sets reference voltage amplitude and frequency, virtual impedance link is default.
As shown in Fig. 5 (b), voltage magnitude only has 213V, hence it is evident that is lower than setting value, while THD is 8.51%.Simultaneously because of current transformer 1 and 2
Output impedance mismatch lead to the presence of apparent uneven flow phenomenon.
In contrast, when utilizing the sagging control strategy based on virtual impedance, as shown in Fig. 5 (c), quality of voltage is changed
Kind THD is only 4.71%, and voltage magnitude becomes 218V close to setting value 220V, and can preferably realize twin-channel power
Distribution.
Sagging control proposed in the present invention based on virtual impedance, can save capacitance voltage detection part and locking phase
Ring reduces costs, reduces the computational burden of control system and effectively inhibits harmonic wave, and in island mode, energy
The preferable distribution for realizing power is a kind of distributed generation resource change control method suitable for micro-capacitance sensor being worthy to be popularized.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (6)
1. it is a kind of based on the distributed generation resource of virtual impedance without ac sensor control method, it is characterized in that: the following steps are included:
(1): the power control link of distributed generation resource: passing through active power-frequency and reactive power-voltage magnitude control ring
Section can obtain the reference frequency f of system current periodrefWith reference voltage amplitude Eref, then through sinusoidal signal generator can obtain base
Quasi- voltage
(2): voltage control loop section: detection distributed generation resource first exports electric current I1, using the control strategy based on virtual impedance,
Obtain PWM reference voltage
(3): passing through the reference voltage of current periodWith output electric current I1The distributed generation resource output for calculating next period is active
Power PDGAnd reactive power QDG, be used for next period the step of (1) in active power-frequency and reactive power-voltage magnitude
Controlling unit；
In the step (3), PDGAnd QDGFor distributed generation resource output active power and reactive power, its calculation formula is:
Wherein,And I1_delayThe voltage reference value and output current value of respectively upper a cycle.
2. it is as described in claim 1 it is a kind of based on the distributed generation resource of virtual impedance without ac sensor control method, it is special
Sign is: the distributed generation resource power control link in the step (1) includes micro-grid connection operational mode and micro-capacitance sensor isolated island
Mode.
3. it is as claimed in claim 2 it is a kind of based on the distributed generation resource of virtual impedance without ac sensor control method, it is special
Sign is:
Under micro-grid connection operational mode, the power control link of distributed generation resource passes through active power-frequency and idle function
The sagging control of rate-voltage magnitude can obtain the reference frequency f of system current periodrefWith reference voltage amplitude Eref:
fref=DP(Pref-PDG)
Wherein, PrefAnd QrefFor the reference value of active power and reactive power, it is configured according to the capacity of distributed generation resource；DP
For active power-frequency proportionality coefficient；DqAnd KiFor reactive power-voltage magnitude proportionality coefficient and integral coefficient；PDGWith
QDGFor the real-time active power and reactive power of distributed generation resource output；frefAnd ErefFor benchmark voltageFrequency and width
Value, generates reference voltage through sinusoidal signal generator
4. it is as claimed in claim 2 it is a kind of based on the distributed generation resource of virtual impedance without ac sensor control method, it is special
Sign is: under micro-capacitance sensor isolated operation mode, distributed generation resource power control link passes through active power-frequency and idle function
The sagging control of rate-voltage magnitude can obtain the reference frequency f of system current periodrefWith reference voltage amplitude Eref:
fref=DP·PDG
Eref=Dq·QDG
Wherein, DPFor active power-frequency proportionality coefficient；DqFor reactive power-voltage magnitude proportionality coefficient；PDGAnd QDGFor
The real-time active power and reactive power of distributed generation resource output；frefAnd ErefFor benchmark voltageFrequency and amplitude, warp
Sinusoidal signal generator generates reference voltage
5. it is as described in claim 1 it is a kind of based on the distributed generation resource of virtual impedance without ac sensor control method, it is special
Sign is: under micro-grid connection operational mode, the voltage control loop section of distributed generation resource uses virtual impedance control strategy, passes through
Resonance harmonic current observer obtains the harmonic waves of specific times, is counted by connecting virtual resistance in distributed generation resource outlet side
Calculate PWM reference voltage:
Wherein, I1To export electric current, h is the number of harmonic wave, Rv,hFor the virtual resistance on h subharmonic, ωcFor cutoff frequency, ωo
For output voltage frequency, ωo=2 π 50=100 π rad/s.
6. it is as described in claim 1 it is a kind of based on the distributed generation resource of virtual impedance without ac sensor control method, it is special
Sign is: under micro-capacitance sensor isolated operation mode, the voltage control loop section of distributed generation resource is controlled using virtual impedance, virtual impedance
The voltage drop of generationFor
R in formulav,hThe virtual resistance for being h for overtone order, Lv,hThe virtual reactance for being h for overtone order；
For the resonance problem for avoiding LCL filter, a suitable high-frequency gain is generated using active damping theory
RADActive damping when for high frequency, ωHPFFor the cutoff frequency of high-pass filter, I1For the output current value of current period；
Finally, the PWM reference voltage after improved are as follows:
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| CN110429601A (en) * | 2019-08-27 | 2019-11-08 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | A kind of isolated island micro-capacitance sensor PCC node voltage increased quality method |
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