CN102832642B - Control method of quality control system of micro source internetworking electric energy - Google Patents
Control method of quality control system of micro source internetworking electric energy Download PDFInfo
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- CN102832642B CN102832642B CN201210335923.3A CN201210335923A CN102832642B CN 102832642 B CN102832642 B CN 102832642B CN 201210335923 A CN201210335923 A CN 201210335923A CN 102832642 B CN102832642 B CN 102832642B
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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]
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
Abstract
The invention discloses a control method for a quality control system of micro source internetworking electric energy. A primary side of the coupling voltage transformer on a serial active power filter side of a UPQC (unified power quality controller) is connected with a larger current-limiting inductor in parallel, and a direct-current large-capacitance side of the UPQC is connected with a photovoltaic generating power supply in parallel. Due to effects of cooperative control, the photovoltaic power supply is internetworked for power generation during normal operation, active power is provided for a power grid by the parallel active power filter of the UPQC, and the harmonic current from a load side and the voltage fluctuation and harmonic voltage from the power grid side are governed and compensated by the UPQC. In the case of short-circuiting failure on the load side, the main circuit of the UPQC stops operating, a secondary side of the coupling voltage transformer is subjected to high impedance, and the current can be limited by the parallel current-limiting large inductor. By adopting the method, the functions of failure current limitation, harmonic treatment, voltage support, photovoltaic power generation and the like can be realized during micro grid internetworking operation, and the optimized protection and operation of the quality of electric energy in micro grid internetworking can also be realized.
Description
Technical field
The present invention relates to the micro-source of a kind of intelligent distribution network grid-connected and quality of power supply control multiple-variable flow system and control method thereof.
Background technology
Microgrid is the distributed type minisize electric power network technique based on regenerative resource, more and more receives in recent years people's concern.But microgrid is in the time being incorporated into the power networks, due to intermittence, the unsteadiness in micro-source, and the use of a large amount of power electronics to cause the inner and power distribution network of microgrid to access out a power quality index poor.In the time that a large amount of distributed power sources drop into, more can bring many power quality problems simultaneously.This will produce harm greatly to the exigent equipment of power supply quality to some, also can produce bad impact to the quality of power supply of large electrical network.For addressing this problem, when grid-connected to micro-source, quality of power supply processing has had higher requirement: processing, the restriction load short circuit current of when can carrying out the grid-connected power supply in micro-source, carrying out the quality of power supply.And more existing devices have the following disadvantages:
1, the device of existing restriction load short circuit current is illustrated in figure 1 the transformer coupled three-phase bridge solid-state current limiter with by-pass inductor, and its operation principle is: while normally operation, and the each conducting 180 of three-phase bridge thyristor T1 ~ T6
ot7, T8 trigger impulse often add, electric current in DC inductance is the current peak that load current is coupled to secondary side, approximately constant, the voltage at DC inductance two ends is approximately zero, so coupling transformer secondary voltage is approximately zero, coupling transformer secondary equiva lent impedance is zero, former limit is equivalent to by short circuit, and series reactance is inoperative, and the system that do not affect is normally moved; In the time being short-circuited fault, on transformer, bear voltage, by-pass inductor and seal in major loop after the Equivalent DC inductance in parallel on former limit, the rising of cut-off current by transformer coupled; Control system is blocked each thyristor pulse, Shi Qiao road is out of service, secondary is equivalent to short circuit, thereby by-pass inductor is automatically connected into by short circuit line, play the object of current limliting, therefore, in the time that electrical network normally moves, flow restricter seals in electrical network and has no-load running, has so just formed loss, has caused the wasting of resources.
2, existing power quality controlling device is illustrated in figure 2 Unified Power Quality Controller.Its operation principle: Circuits System is made up of a series connection APF and an APF in parallel, both common DC sides.Wherein, series connection APF near grid side works by controlled voltage source mode, is connected in series between electrical network and load, by transformer in the time that fluctuation occurs grid side voltage, inject an amplitude, the controlled bucking voltage of phase place to electrical network, with proof load voltage stabilization; And work by controlled current source mode near the APF in parallel of load-side, being connected to load-side by outputting inductance L, the electric current to electrical network injection with load harmonic wave and reactive current opposite sign but equal magnitude, suppresses the impact of nonlinear load Current on Grid.The stable of DC capacitor voltage maintained from electrical network absorption or release active power by APF in parallel.
Existing power quality controlling device, fault current limiter, photovoltaic power generation apparatus all can not be taken into account power quality controlling, failure current limit and photovoltaic generation, and microgrid construction cost is increased.While solid-state current limiter T1-T8 in the time of normal work manages and DC inductance has electric current to flow through for a long time, has formed long loss, has caused the waste of resource.
Summary of the invention
Technical problem to be solved by this invention is, for prior art deficiency, a kind of micro-source network electric energy quality control system control method are provided, this system control method can effectively solve the energy consumption problem of solid-state current limiter, simultaneously inhibition voltage fluctuation be can play, various non-linear, harmonics and reactive currents that impact load causes and the effect of parallel network power generation suppressed.Improve micro-source generate electricity by way of merging two or more grid systems power quality index and security reliability in process.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of micro-source network electric energy quality control system control method, comprise micro-source network electric energy quality control system, described micro-source network electric energy quality control system comprise Unified Power Quality Controller, coupling transformer, drive circuit, short-circuit current detection circuit, dsp controller, described Unified Power Quality Controller is composed in series by series connection type active electric power filter and parallel connection type active electric filter, three outputs of described series connection type active electric power filter are respectively connected with a coupling transformer by a switching tube, between described three coupling transformers access three phase network and threephase load, the former limit of described three coupling transformers is respectively parallel with a large inductance of current limliting, described three coupling transformer secondary connect between two, each coupling transformer secondary is parallel with an electric capacity, described parallel connection type active electric filter also accesses three phase network, and described parallel connection type active electric filter DC bus capacitor side is parallel with a switching tube and photo-voltaic power supply successively, described photo-voltaic power supply comprises photovoltaic array and photovoltaic array electric capacity, described photovoltaic array and photovoltaic array Capacitance parallel connection, described short-circuit current detection circuit is connected with the first drive circuit, and the first drive circuit is connected with the switching tube between series connection type active electric power filter and coupling transformer, described dsp controller is connected with the second drive circuit, the 3rd drive circuit, the 4th drive circuit, described the second drive circuit is connected with the switching tube of series connection type active electric power filter, the switching tube of described the 3rd drive circuit and parallel connection type active electric filter, described the 4th drive circuit is connected with the switching tube of photovoltaic electric source, and the method step is as follows:
1) detect three-phase electricity voltage on line side
,
,
, three-phase electricity current on line side
,
,
, coupling transformer original edge voltage
,
,
, threephase load electric current
,
,
, parallel connection type active electric filter output current
,
,
, DC capacitor voltage
, photovoltaic array output capacitance voltage
, photovoltaic array output current
: by the digit phase after the A phase voltage zero-crossing point of power grid of PLL digital phase-locked loop measurement three phase network voltage;
2) according to the load-side current value detecting
,
,
, short-circuit current detection circuit judges whether load-side occurs short trouble, and exports corresponding switching signal
; If there is short circuit in load-side, short-circuit current detection circuit output low level,
be 0, the first drive circuit all disconnects the switching tube between series connection type active electric power filter and coupling transformer secondary, the second drive circuit all turn-offs the switching tube of the series connection type active electric power filter of Unified Power Quality Controller simultaneously, the 3rd drive circuit, the 4th drive circuit make respectively the parallel connection type active electric filter of Unified Power Quality Controller and the switching tube of photovoltaic electric source all disconnect, and photo-voltaic power supply and Unified Power Quality Controller are completely out of service; If there is not short trouble in load-side, short-circuit current detection circuit output high level,
be 1, the first drive circuit makes the whole conductings of switching tube between series connection type active electric power filter and coupling transformer secondary, the second drive circuit makes series connection type active electric power filter be operated in harmonic voltage improvement and voltage compensation state, the 3rd drive circuit, the 4th drive circuit make respectively parallel connection type active electric filter and photo-voltaic power supply be operated in photovoltaic generation and load harmonic current compensating coefficient, Unified Power Quality Controller and photo-voltaic power supply put into operation, enter 3);
3) basis
,
, obtain photovoltaic generation active current reference value by MPPT algorithm
, photovoltaic array capacitance voltage reference value
;
4) according to threephase load electric current
,
,
, photovoltaic generation active current reference value
and digit phase after the A phase voltage zero-crossing point of power grid that measures of PLL digital phase-locked loop, obtain by compound ip-iq algorithm meritorious, the idle and harmonic current composite reference that series connection type active electric power filter need compensate
,
,
, after current feedback, produce output current by dsp controller and the 3rd drive circuit control parallel connection type active electric filter; Wherein photovoltaic generation active current reference value
and the reference signal of parallel connection type active electric filter DC bus capacitor
with detection signal
difference be added to together in instantaneous real component through pi regulator, guarantee that the stable and photovoltaic generation of DC bus capacitor has function to be transferred to three phase network by parallel connection type active electric filter;
5) the photovoltaic array capacitance voltage reference value obtaining according to MPPT algorithm
, after Voltage Feedback, by dsp controller and the 4th drive circuit, drive the switching tube of photovoltaic electric source, guarantee that photo-voltaic power supply is operated in maximum power point place;
6) digit phase after the A phase voltage zero-crossing point of power grid being measured by PLL digital phase-locked loop calculates through threephase load voltage instruction, obtains threephase load required voltage waveform, this waveform and actual three-phase electricity voltage on line side
,
,
subtract each other and obtain the voltage reference signal that series connection type active electric power filter need to compensate
,
,
; Form pwm signal control series connection type active electric power filter generation bucking voltage by Voltage Feedback through dsp controller and the second drive circuit simultaneously.
As preferred version, described short-circuit current detection circuit comprises three primary current instrument transformers, NOR gate and processors, three primary current instrument transformers are respectively by the secondary current instrument transformer, A/D sample circuit, the comparator access NOR gate that connect successively, and NOR gate is connected with processor.
As preferred version, described the first drive circuit, the second drive circuit, the 3rd drive circuit, the 4th drive circuit are photoelectric coupling drive circuit.
By UPQC(Unified Power Quality Controller), the acting in conjunction of fault current limiter (current-limiting inductance and the switching tube of connecting with coupling transformer) and photo-voltaic power supply, realized the effect of micro-source power quality controlling and failure current limit when generating electricity by way of merging two or more grid systems.
The operation principle of micro-source of the present invention network electric energy quality control system is: when electrical network is normal, operate in UPQC and photovoltaic generation pattern, series connection type active electric power filter compensation is from voltage harmonic and the inhibition voltage fluctuation of grid side, the parallel connection type electric-power filter of having chance with suppresses the harmonic problem that various non-linear, harmonics and reactive currents that impact load causes and photovoltaic generation cause, photo-voltaic power supply is had chance with electric-power filter to the meritorious energy of electrical network output by parallel connection type simultaneously.Now coupling transformer two ends only have harmonic voltage to fall and voltage fluctuation, and because the former limit of coupling transformer shunt inductance (current-limiting inductance) La, Lb, Lc inductance value are larger, harmonic impedance is higher, therefore, the electric current flowing through on inductance is very little, do not affect UPQC and electrical network normally moves, when electrical network is short-circuited fault, close all switching tubes, operate in current-limit mode, now UPQC and photo-voltaic power supply are out of service, and series transformer secondary is very big impedance, power network current flows through from current-limiting inductance La, Lb, Lc, thus restriction grid short circuit electric current.
Compared with prior art, the beneficial effect that the present invention has is: the present invention has broken through the present situation of conventional solid-state flow restricter no-load running in the time that electrical network normally moves, take full advantage of switching device, pass through photovoltaic power generation apparatus and the effective combination of power quality controlling device UPQC simultaneously, Collaborative Control, solve the microgrid middle short-circuit current limitation that generates electricity by way of merging two or more grid systems, the power quality problems such as harmonic wave inhibition and voltage fluctuation, effectively raise the grid-connected power supply reliability in micro-source and the electrical network quality of power supply, economic benefit and environmental benefit are remarkable, provide theory and technology basis for effectively solving grid short circuit current limit and power quality problem.The inventive method has improved micro-source generate electricity by way of merging two or more grid systems power quality index and security reliability in process.
Accompanying drawing explanation
Fig. 1 is transformer coupled three-phase bridge solid-state current limiter (FCL) structural representation with by-pass inductor;
Fig. 2 is Serial-Parallel Type Active Power Filter-APF UPQC structural representation;
Fig. 3 is the micro-source of one embodiment of the invention network electric energy quality control system electrical block diagram;
Fig. 4 is one embodiment of the invention photo-voltaic power supply equivalent circuit structure schematic diagram;
Fig. 5 is one embodiment of the invention composite signals Computing Principle block diagram;
Fig. 6 is one embodiment of the invention short-circuit current detection circuit structural representation;
Fig. 7 is the control of one embodiment of the invention voltage-tracing, curren tracing control method figure; (a) voltage-tracing control method figure; (b) curren tracing control method figure;
Fig. 8 is one embodiment of the invention photo-voltaic power supply P-V characteristic curve schematic diagram;
Fig. 9 is one embodiment of the invention photo-voltaic power supply interference method flow chart.
Embodiment
As shown in Figure 3 and Figure 4, the micro-source of one embodiment of the invention network electric energy quality control system comprise Unified Power Quality Controller, coupling transformer, drive circuit, short-circuit current detection circuit, dsp controller, described Unified Power Quality Controller is composed in series by series connection type active electric power filter and parallel connection type active electric filter, three outputs of described series connection type active electric power filter are respectively connected with a coupling transformer by a switching tube, between described three coupling transformers access three phase network and threephase load, the former limit of described three coupling transformers is respectively parallel with a large inductance of current limliting, described three coupling transformer secondary connect between two, each coupling transformer secondary is parallel with an electric capacity, described parallel connection type active electric filter also accesses three phase network, and described parallel connection type active electric filter DC bus capacitor side is parallel with a switching tube and photo-voltaic power supply successively, described photo-voltaic power supply comprises photovoltaic array and photovoltaic array electric capacity, described photovoltaic array and photovoltaic array Capacitance parallel connection, described short-circuit current detection circuit is connected with the first drive circuit, and the first drive circuit is connected with the switching tube between series connection type active electric power filter and coupling transformer, described dsp controller is connected with the second drive circuit, the 3rd drive circuit, the 4th drive circuit, described the second drive circuit is connected with the switching tube of series connection type active electric power filter, the switching tube of described the 3rd drive circuit and parallel connection type active electric filter, the switching tube of described the 4th drive circuit photovoltaic electric source connects.
Described the first drive circuit, the second drive circuit, the 3rd drive circuit, the 4th drive circuit are photoelectric coupling drive circuit.
The present invention is on the basis of the original device of a UPQC (Fig. 2) and function, on the large electric capacity of DC side, parallel photovoltaic Blast Furnace Top Gas Recovery Turbine Unit (TRT) plays parallel network power generation, on the former limit of the series coupled transformer of UPQC series inverter and there is large current-limiting inductance, secondary is in series with full-control type device, plays FCL.UPQC can suppress harmonic voltage and the voltage fluctuation from grid side, suppresses various non-linear, harmonic wave and reactive currents that impact load causes, is quality of power supply control system of the present invention.Photovoltaic power generation apparatus is as Fig. 4, and photovoltaic power generation apparatus and UPQC share a parallel connection type active electric filter, and luminous energy is transported to electrical network by DC bus capacitor and parallel connection type active electric filter, are micro-origin systems of the present invention.FCL device can limit short circuit, is current limiting system of the present invention.The running status of system of the present invention is, in the time that system works is not normally short-circuited, the quality of power supply is processed and photovoltaic generation normally carries out simultaneously, in the time that system is short-circuited, the quality of power supply process and the photovoltaic generation while out of service.
Detect threephase load side electric current by short-circuit current detection circuit
,
,
whether short circuit, and produce control signal and control cut-offfing of coupling transformer secondary IGBT, in the time that load-side is short-circuited, short-circuit current detection circuit produces low level turn-offs coupling transformer secondary IGBT, former limit produces high impedance, current-limiting inductance seals in electrical network and plays metering function, in the time that load is not broken down, short-circuit current detection circuit produces high level makes secondary IGBT open-minded, UPQC and photovoltaic generation put into operation, compensation harmonic voltage, harmonic current, coupling transformer two ends only have harmonic voltage to fall, and due to the former limit of coupling transformer shunt inductance (current-limiting inductance) La, Lb, Lc inductance value is larger, harmonic impedance is higher, therefore, the electric current flowing through on inductance is very little, do not affect UPQC and microgrid normally moves, specific implementation process is as follows:
According to the load-side current value detecting
,
,
, short-circuit current detection circuit judges whether load-side occurs short trouble, and exports corresponding switching signal
; If there is short circuit in load-side, short-circuit current detection circuit output low level,
be 0, the first drive circuit all disconnects the switching tube of connecting between APF and coupling transformer secondary, the second drive circuit all turn-offs the switching tube of the series connection type active electric power filter part of UPQC simultaneously, the 3rd drive circuit, the 4th drive circuit make respectively the parallel connection type active electric filter of UPQC and the switching tube of photovoltaic electric source all disconnect, and photo-voltaic power supply and UPQC are completely out of service; If there is not short trouble in load-side, short-circuit current detection circuit output high level,
be 1, the first drive circuit whole conductings of switching tube between APF and coupling transformer secondary that make to connect, the second drive circuit makes series connection type active electric power filter be operated in harmonic voltage improvement and voltage compensation state, the 3rd drive circuit, the 4th drive circuit make respectively parallel connection type active electric filter and photo-voltaic power supply circuit working at photovoltaic generation and load harmonic current compensating coefficient, and UPQC and photovoltaic power generation apparatus put into operation.
Dsp controller, by sampling electric network information, by programming, through A/D conversion, calculates the voltage reference signal that series connection type active electric power filter need to compensate
,
,
, parallel connection meritorious, the idle and harmonic current composite reference that electric-power filter need compensate of having chance with
,
,
, obtain photovoltaic generation active current reference value by MPPT algorithm
with photovoltaic array capacitance voltage reference value
, these reference signals produce pwm signal through the voltage-tracing control of DSP and current tracking control function, realize output.
Photo-voltaic power supply operation principle: adopt maximum power point-tracing control method (based on disturbance from optimizing MPPT control method).From solar cell photovoltaic P-V curve chart 8, in the region that is less than Umax, power output increases with the increase of voltage, in the region that is greater than Umax, power output reduces with being increased to of voltage, visible MPPT maximum power point tracking be in fact one from searching process, by controlling solar cell terminal voltage, when the operating voltage of photovoltaic cell
equal
time, its power output P also reaches maximum thereupon, makes photovoltaic cell be operated in maximum power point, has so just guaranteed that photovoltaic cell can adapt to the variation of sunshine and temperature environment, thereby intelligence be operated in maximum power point, constantly obtain maximum power output.
The basic principle of MPPT algorithm: periodically add a disturbance quantity C to the output voltage of photovoltaic array, the relatively variation of its present output power and a upper cycle power output size, if output variable power increases, next cycle does not change perturbation direction, continue to add disturbance quantity C, otherwise add in the opposite direction disturbance, the disturbance quantity of native system is voltage.System is by the duty ratio to Boost circuit in photo-voltaic power supply
control realize the control to photovoltaic array capacitance voltage, the flow chart of this interference method is as Fig. 9.
Photovoltaic array output voltage is carried out to closed-loop control, reach MPPT maximum power point tracking, realized by Boost circuit, as shown in Figure 4, R1 is the equivalent resistance in inductance L 1 to its equivalent electric circuit.
When system works is during in stable state, photovoltaic output voltage
and DC voltage
stablize constant, Boost contactor pipe conducting t
0time, have
As Boost contactor pipe blocking-up t
1time, have
From the principle of Boost circuit, when stable state, inductance L 1 average voltage in one-period is zero, obtains from formula (1) and formula (2)
Cycle time
, can obtain thus
When stable state,
invariable, so photovoltaic array output capacitance current average is zero, Boost inductive current
equal photovoltaic array output current
, it is by the relation of photovoltaic array output voltage and electric current, known,
,
be about
variable coefficient formula, electric current becomes corresponding relation with voltage, (4) formula can be expressed as
By controlling the conducting duty ratio of S10
can control photovoltaic array output voltage
, what native system adopted is proportional plus integral control, by the actual output voltage of photovoltaic array and given voltage
relatively, after regulating, PI relatively carries out PWM modulation with triangular carrier, by the change control conducting duty ratio of pulsewidth
, realize the closed-loop control of photovoltaic array output voltage.
Photovoltaic generation and UPQC composite signals Computing Principle:
(1) adopting the harmonic wave detection ip-iq method of instantaneous power theory is basic composite method control parallel connection type active electric filter, threephase load electric current
,
with
process
the meritorious DC component of first-harmonic with what obtain after LPF low-pass filtering
,
the grid-connected meritorious DC component of photovoltaic array being calculated by MPPT,
for DC side is stablized required active current DC component.
As shown in Figure 5: after instruction is synthetic, become:
So, can obtain compound control command electric current
,
,
for
The Section 1 of instruction current is the idle and harmonic current components in ip-iq Harmonic Detected Theory as can be seen from the above equation, and Section 2 is fundamental active current, has wherein comprised the grid-connected meritorious DC component of photovoltaic array
stablize required active current DC component with DC side
.Command signal drives parallel connection type active electric filter switching tube (S1-S6) output current by dsp controller.
(2) shown in Figure 5: to enter overload voltage instruction by the digit phase after the A phase voltage zero-crossing point of power grid of PLL digital phase-locked loop measurement three phase network voltage and calculate load required voltage waveform and actual electrical voltage on line side
,
,
subtract each other and obtain the voltage reference signal that series inverter need to compensate
,
,
.By Voltage Feedback, form pwm signal through dsp controller simultaneously, then drive series connection type active electric power filter (T1-T6) to produce bucking voltage through the second drive circuit.
Shown in 6, short-circuit current detection circuit comprises three primary current instrument transformers, NOR gate and processors, three primary current instrument transformers are respectively by the secondary current instrument transformer, A/D sample circuit, the comparator access NOR gate that connect successively, and NOR gate is connected with processor.
Shown in Figure 7: to be respectively voltage-tracing control and curren tracing control method figure, they all adopt triangle wave mode, command signal obtains the pwm control signal of in parallel and series connection type active electric power filter IGBT after voltage-tracing control and the control of electric current current tracking, controls Unified Power Quality Controller work.
In which, the deviation of command signal and actual compensating signal is passed through amplifier A afterwards and triangle wave, then by output pwm signal after comparator.
Claims (5)
1. a micro-source network electric energy quality control system control method, comprise micro-source network electric energy quality control system, described micro-source network electric energy quality control system comprise Unified Power Quality Controller, coupling transformer, drive circuit, short-circuit current detection circuit, dsp controller, described Unified Power Quality Controller is composed in series by series connection type active electric power filter and parallel connection type active electric filter, three outputs of described series connection type active electric power filter are respectively connected with a coupling transformer by a switching tube, three coupling transformers access between three phase network and threephase load, the former limit of described three coupling transformers is respectively parallel with a large inductance of current limliting, three coupling transformer secondary connect between two, each coupling transformer secondary is parallel with an electric capacity, described parallel connection type active electric filter also accesses three phase network, and described parallel connection type active electric filter DC bus capacitor side is parallel with a switching tube and photo-voltaic power supply successively, described photo-voltaic power supply comprises photovoltaic array and photovoltaic array electric capacity, described photovoltaic array and photovoltaic array Capacitance parallel connection, described short-circuit current detection circuit is connected with the first drive circuit, and the first drive circuit is connected with the switching tube between series connection type active electric power filter and coupling transformer, described dsp controller is connected with the second drive circuit, the 3rd drive circuit, the 4th drive circuit, described the second drive circuit is connected with the switching tube of series connection type active electric power filter, described the 3rd drive circuit is connected with the switching tube of parallel connection type active electric filter, described the 4th drive circuit is connected with the switching tube of photovoltaic electric source, it is characterized in that, the method step is as follows:
1) detect three-phase electricity voltage on line side
,
,
, three-phase electricity current on line side
,
,
, coupling transformer original edge voltage
,
,
, threephase load electric current
,
,
, parallel connection type active electric filter output current
,
,
, DC capacitor voltage
, photovoltaic array output capacitance voltage
, photovoltaic array output current
: by the digit phase after the A phase voltage zero-crossing point of power grid of PLL digital phase-locked loop measurement three phase network voltage;
2) according to the load-side current value detecting
,
,
, short-circuit current detection circuit judges whether load-side occurs short trouble, and exports corresponding switching signal
; If there is short circuit in load-side, short-circuit current detection circuit output low level,
be 0, the first drive circuit all disconnects the switching tube between series connection type active electric power filter and coupling transformer secondary, the second drive circuit all turn-offs the switching tube of the series connection type active electric power filter of Unified Power Quality Controller simultaneously, the 3rd drive circuit, the 4th drive circuit make respectively the parallel connection type active electric filter of Unified Power Quality Controller and the switching tube of photovoltaic electric source all disconnect, and photo-voltaic power supply and Unified Power Quality Controller are completely out of service; If there is not short trouble in load-side, short-circuit current detection circuit output high level,
be 1, the first drive circuit makes the whole conductings of switching tube between series connection type active electric power filter and coupling transformer secondary, the second drive circuit makes series connection type active electric power filter be operated in harmonic voltage improvement and voltage compensation state, the 3rd drive circuit, the 4th drive circuit make respectively parallel connection type active electric filter and photo-voltaic power supply be operated in photovoltaic generation and load harmonic current compensating coefficient, Unified Power Quality Controller and photo-voltaic power supply put into operation, enter 3);
3) basis
,
, obtain photovoltaic generation active current reference value by MPPT algorithm
, photovoltaic array capacitance voltage reference value
;
4) according to threephase load electric current
,
,
, photovoltaic generation active current reference value
and digit phase after the A phase voltage zero-crossing point of power grid that measures of PLL digital phase-locked loop, obtain by compound ip-iq algorithm meritorious, the idle and harmonic current composite reference that series connection type active electric power filter need compensate
,
,
, after current feedback, produce output current by dsp controller and the 3rd drive circuit control parallel connection type active electric filter; Wherein photovoltaic generation active current reference value
and the reference signal of parallel connection type active electric filter DC bus capacitor
with detection signal
difference be added to together in instantaneous real component through pi regulator, guarantee that the stable and photovoltaic generation of DC bus capacitor has function to be transferred to three phase network by parallel connection type active electric filter;
5) the photovoltaic array capacitance voltage reference value obtaining according to MPPT algorithm
, after Voltage Feedback, by dsp controller and the 4th drive circuit, drive the switching tube of photovoltaic electric source, guarantee that photo-voltaic power supply is operated in maximum power point place;
6) digit phase after the A phase voltage zero-crossing point of power grid being measured by PLL digital phase-locked loop calculates through threephase load voltage instruction, obtains threephase load required voltage waveform, this waveform and actual three-phase electricity voltage on line side
,
,
subtract each other and obtain the voltage reference signal that series connection type active electric power filter need to compensate
,
,
; Form pwm signal control series connection type active electric power filter generation bucking voltage by Voltage Feedback through dsp controller and the second drive circuit simultaneously.
2. micro-source according to claim 1 network electric energy quality control system control method, is characterized in that, described switching tube is IGBT.
3. micro-source according to claim 1 network electric energy quality control system control method, it is characterized in that, described short-circuit current detection circuit comprises three primary current instrument transformers, NOR gate and processors, three primary current instrument transformers are respectively by the secondary current instrument transformer, A/D sample circuit, the comparator access NOR gate that connect successively, and NOR gate is connected with processor.
4. micro-source according to claim 3 network electric energy quality control system control method, is characterized in that, described processor is single-chip microcomputer.
5. micro-source according to claim 1 network electric energy quality control system control method, is characterized in that, described the first drive circuit, the second drive circuit, the 3rd drive circuit, the 4th drive circuit are photoelectric coupling drive circuit.
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