CN104795826A - Operation control method for combined three-phase inverter - Google Patents

Operation control method for combined three-phase inverter Download PDF

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Publication number
CN104795826A
CN104795826A CN201510180564.2A CN201510180564A CN104795826A CN 104795826 A CN104795826 A CN 104795826A CN 201510180564 A CN201510180564 A CN 201510180564A CN 104795826 A CN104795826 A CN 104795826A
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phase
inverter
voltage
output
power
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CN104795826B (en
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任碧莹
赵欣荣
孙向东
张琦
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GUANGDONG YUANJING ENERGY CO., LTD.
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Xian University of Technology
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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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • 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
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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  • Inverter Devices (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)

Abstract

The invention discloses an operation control method for a combined three-phase inverter. The operation control method includes steps of acquiring three-phase filter capacitive voltage and three-phase filter inductive current signals of the inverter; computing the average power of voltage values and current values of various phases to obtain the output average active power and output reactive power of the various phases and acquiring output three-phase voltage reference values via a droop controller; subtracting corresponding output phase voltages of the inverter from the output voltage reference values of the various phases to obtain voltage errors of the various phases; regulating the voltage errors of the various phases by the aid of a voltage regulator to generate modulation signals and modulating the modulation signals by the aid of a modulation module to generate switch control signals. The operation control method for the combined three-phase inverter has the advantage that the symmetry of the output three-phase voltages of the inverter can be guaranteed in off-grid operation modes of micro-grids when three-phase loads are unbalanced.

Description

A kind of Three-Phase Inverter progress control method
Technical field
The invention belongs to micro-capacitance sensor from distributed power source technical field of power generation under net pattern, relate to a kind of Three-Phase Inverter progress control method.
Background technology
In recent years, serious due to the in short supply of the energy and environmental pollution, the development of micro-capacitance sensor is paid much attention in countries in the world.Micro-capacitance sensor be collected by distributed power source, energy-storage system, energy conversion device, monitoring and protective device, load etc. be small-sizedly transported to electricity, using electricity system, both can be incorporated into the power networks also can islet operation.The important component part of micro-capacitance sensor is distributed power source, and distributed power source has many-sided advantage, such as: contribute to improving distribution system to the receiving ability of distributed power source; Effectively can improve the utilization ratio of batch (-type) regenerative resource, realize using energy, and distribution network loss can be reduced; When electric network fault, can ensure that critical load is powered, improve power supply reliability; Can be used for the powerup issue solving user from far-off regions.
During micro-capacitance sensor islet operation, the reference of voltage and frequency is produced by micro-capacitance sensor inside, and control method adopts equity to control usually.Equity control strategy is the flexibility based on having during distributed power source operation in the relation of micro-capacitance sensor and public electric wire net and micro-capacitance sensor, the control program of the one " plug and play " of design.Write to each other because reciprocity control strategy does not rely on, thus micro-capacitance sensor construction and maintenance cost can be reduced, improve the reliability of work.
If often adopt droop control mode using voltage source inverter (VSI) as output interface for each distributed power source, namely by voltage and current that in-site collecting voltage source inverter exports, calculate meritorious, idle, again according to the frequency and voltage amplitude that droop characteristic regulates VSI to export, carry out control inverter power output, can effective follow load demand, and can automatic current equalizing be realized when inverter parallel, load power is divided equally by inverter capacity.
But based in the Three-Phase Inverter parallel running of droop control, how controlling the symmetry of inverter output voltage under three-phase imbalance load is a difficult point, and control method therefore reasonable in design is necessary.
Summary of the invention
The object of this invention is to provide a kind of Three-Phase Inverter progress control method, at micro-capacitance sensor under network operation pattern, when three-phase load unbalance, can ensure that inverter exports the symmetry of three-phase voltage.
The technical solution adopted in the present invention is, a kind of Three-Phase Inverter progress control method, implements according to following steps:
Step 1, gathers the three-phase filter capacitor voltage u of inverter a, u b, u cwith three-phase filter inductance current signal i a, i b, i c;
Step 2, utilize average power to calculate each phase voltage value that module gathers step 1 and current value are averaged power calculation, obtain the output average active power P of each phase of inverter a, P b, P cwith output reactive power Q a, Q b, Q c;
Step 3, by each average active power of the output mutually P obtained in step 2 a, P b, P cwith output reactive power Q a, Q b, Q cthe output three-phase voltage reference value u that droop control obtains inverter is carried out through droop control device refa, u refb, u refc;
Step 4, exports each phase voltage reference value u by inverter refa, u refb, u refcphase voltage u is exported with corresponding inverter a, u b, u csubtract each other, obtain each phase voltage error delta u a, Δ u b, Δ u c;
Step 5, exports each phase voltage error delta u by inverter a, Δ u b, Δ u cinput in voltage regulator, and regulate through voltage regulator, export each phase-current reference value i refx;
Step 6, exports each phase-current reference value by inverter and inverter output current subtracts each other, and obtains each phase current error;
Step 7, inputs to each phase current error in current regulator, and carries out adjustment generation modulation signal through current regulator;
Step 8, modulation signal is modulated through modulation module, produces switch controlling signal, thus regulates inverter, ensures that inverter exports the symmetry of three-phase voltage.
Feature of the present invention is also,
Step 2 is specially the three-phase filter capacitor voltage u that average power calculating module adopts power calculation algorithms to gather a, u b, u cwith three-phase filter inductance current signal i a, i b, i cadopt virtual orthographic vector meter algorithm, then through the output average power of the method calculating inverter of low-pass filtering.
In step 2, average power calculates module employing instantaneous power integration method and is averaging power.
Step 3 is implemented according to following steps:
Step 3.1, droop control device exports average active power P mutually by each a, P b, P ccarry out process and obtain electric voltage frequency, to output reactive power Q a, Q b, Q ccarry out process and obtain voltage magnitude;
Step 3.2, carries out integration the electric voltage frequency that step 3.1 obtains and differs in conjunction with the initial phase angle of three-phase voltage the phase place that 120 degree obtain three-phase voltage, and utilizing three-phase voltage phase place and voltage magnitude to obtain reference voltage vector u refa, u refb, u refc.
In step 3.1, droop control device processes in accordance with the following methods for active power;
A, sets up S function; S function is:
f x = 50 + 1 2 - 1 1 + e - ρ ( P x - P r )
In formula, p x(x=a, b, c) be the active power of output of each phase, f x(x=a, b, c) each phase output frequency; wherein ρ is meritorious sagging coefficient, P rfor inverter rated power;
B, the central point of setting S function is M (P 0, f 0), thus determine a reference curve S; Wherein, P 0=P r/ 2, f 0for rated frequency;
C, calculates offset Δ P, and according to the reference curve S that step 3.2 is determined, determines the S curve of each phase, wherein Δ P=P x-P 0; Be specially:
The average active power p that each is exported mutually xwith p 0relatively, if p x< p 0, then by M point to left | Δ P|, obtains the reference curve of this phase; If P x> P 0, then by M point to right translation | Δ P|, obtains the reference curve of this phase.
In step 3.1, droop control device processes reactive power by the following method:
A, according to each average reactive power sizes values exported mutually, judges load mesophase spherule;
B, adopts fixing sagging coefficient for load mesophase spherule, and makes the amplitude of load mesophase spherule equal rated no-load voltage;
C, makes the sagging coefficient of other two-phases equal with the sagging coefficient of load mesophase spherule, and mesophase spherule curve is carried out upper and lower translation and obtain other two-phase curves.
In step 5, voltage regulator is independent pure proportional controller, PI controller, PR controller, accurate ratio resonant controller or repetitive controller.
In step 7, current regulator is pure proportional controller or pi controller, predictive-current control device or track with zero error device.
In step 8, modulation module adopts sinusoidal pulse width modulation.
The invention has the beneficial effects as follows and introduce S function to replace traditional droop control curve in P-f sagging curve, when three-phase load unbalance, make three-phase all consistent with the frequency with reference to S curve by translation S curve, and traditional Q-V sagging curve is improved, first load mesophase spherule is judged according to each power exported mutually, fixing sagging coefficient is adopted for mesophase spherule droop control, other two-phases take the sagging coefficient identical with load mesophase spherule, make the amplitude of three-phase output voltage consistent by translation, thus the voltage magnitude of three-phase and frequency are all consistent, reach the object that inverter exports three-phase voltage symmetry.
Accompanying drawing explanation
Fig. 1 is the structural representation of three-phase combined inverter bridge circuit in a kind of Three-Phase Inverter progress control method of the present invention;
Fig. 2 is the theory diagram of a kind of Three-Phase Inverter progress control method of the present invention;
Fig. 3 is the schematic diagram in a kind of Three-Phase Inverter progress control method of the present invention, active power being carried out to droop control;
Fig. 4 is the schematic diagram in a kind of Three-Phase Inverter progress control method of the present invention, reactive power being carried out to droop control.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
A kind of Three-Phase Inverter progress control method of the present invention, based on a kind of three-phase combined inverter bridge circuit structure, concrete structure as shown in Figure 1, comprise a phase full-bridge inverter circuit be made up of Sa1 ~ Sa4 tetra-switches, the b phase full-bridge inverter circuit of Sb1 ~ Sb4 tetra-switch compositions, the c phase full-bridge inverter circuit of Sc1 ~ Sc4 tetra-switch compositions, through L x, C x(export according to three-phase and four-line through transformer again after x=a, b, c) filter circuit.Each through X xbe connected with low voltage three-phase four-wire system public exchange bus after (x=a, b, c, N) line impedance.Each single-phase load or three-phase load are connected on public exchange bus.Load can, in linear load that is resistive, perceptual, capacitive composition, also can be nonlinear-load;
As shown in Figure 2, method of the present invention is implemented according to following steps:
Step 1, gathers the three-phase filter capacitor voltage u of inverter a, u b, u cwith three-phase filter inductance current signal i a, i b, i c;
Step 2, utilize average power to calculate each phase voltage value that module gathers step 1 and current value are averaged power calculation, obtain the output average active power P of each phase of inverter a, P b, P cwith output reactive power Q a, Q b, Q c;
Wherein, the three-phase filter capacitor voltage u that the power calculation algorithms that average power calculates module employing can gather a, u b, u cwith three-phase filter inductance current signal i a, i b, i cadopt virtual orthographic vector meter algorithm, then through the output average power of the method calculating inverter of low-pass filtering; Also power can be averaging by adopting instantaneous power integration method;
Step 3, by each average active power of the output mutually P obtained in step 2 a, P b, P cwith output reactive power Q a, Q b, Q cthe output three-phase voltage reference value u that droop control obtains inverter is carried out through droop control device refa, u refb, u refc;
In above-mentioned steps, droop control implement body carries out droop control in accordance with the following methods:
Step 3.1, droop control device exports average active power P mutually by each a, P b, P ccarry out process and obtain electric voltage frequency, to output reactive power Q a, Q b, Q ccarry out process and obtain voltage magnitude;
In step 3.1, droop control device processes in accordance with the following methods for active power;
A, sets up S function; S function is:
f x = 50 + 1 2 - 1 1 + e - &rho; ( P x - P r )
In formula, p x(x=a, b, c) be the active power of output of each phase, f x(x=a, b, c) each phase output frequency; wherein ρ is meritorious sagging coefficient, P rfor inverter rated power;
B, the central point of setting S function is M (P 0, f 0), thus determine a reference curve S; Wherein, P 0=P r/ 2, f 0for rated frequency, namely work as P=P 0time frequency corresponding to reference curve S;
C, calculates offset Δ P, and according to the reference curve S that step 3.2 is determined, determines the S curve of each phase, wherein Δ P=P x-P 0; Be specially:
The average active power p that each is exported mutually xwith p 0relatively, if p x< p 0, then by M point to left | Δ P|, obtains the reference curve of this phase; If P x> P 0, then by M point to right translation | Δ P|, obtains the reference curve of this phase; Concrete curve chart as shown in Figure 3;
Such as: if P a< P b< P c, then P is worked as a< P 0time, by M point to left P 0-P a, obtain the central point A'(P of a phase reference curve a, f 0), the S curve that some A is corresponding is then a phase; Work as P b> P 0time, then by M point to right translation P b-P 0, obtain the central point B'(P of b phase reference curve b, f 0), i.e. b phase; In like manner, by M point to right translation P c-P 0, obtain the central point C'(P of c phase reference curve c, f 0);
Droop control device processes reactive power by the following method:
A, according to each average reactive power sizes values exported mutually, judges load mesophase spherule, supposes to work as Q a< Q b< Q ctime, so mesophase spherule is b phase;
B, adopts fixing sagging coefficient n for mesophase spherule x, and make the rated no-load voltage magnitude V of mesophase spherule b0as fiducial value V 0,
V 0＝V b0
C, makes the sagging coefficient of other two-phases equal with the sagging coefficient of load mesophase spherule, and mesophase spherule curve is carried out upper and lower translation and obtain other two-phase curves; Be specially:
V a0＝V 0-n x(Q b-Q a)；
V c0＝V 0-n x(Q b-Q c)；
Wherein, n xfor idle sagging coefficient, q rfor inverter exports maximum reactive power;
As shown in Figure 4, other two-phase takes the sagging coefficient identical with mesophase spherule, and according to the floating voltage V of mesophase spherule 0the rated no-load voltage magnitude V of real-time other two-phase of adjustment a0and V c0; Each phase output voltage amplitude can be obtained thus equal;
Step 3.2, carries out integration the electric voltage frequency that step 3.1 obtains and differs the phase place that 120 degree obtain three-phase voltage, with three-phase voltage voltage magnitude V in conjunction with three-phase voltage phase angle xmcombine and obtain three-phase reference voltage u refa, u refb, u refc;
Step 4, exports each phase voltage reference value u by the inverter obtained in step 3 refa, u refb, u refcphase voltage u is exported with corresponding inverter a, u b, u csubtract each other, obtain each phase voltage error delta u a, Δ u b, Δ u c;
Step 5, exports each phase voltage error delta u by the inverter obtained in step 4 a, Δ u b, Δ u cinput in voltage regulator, and regulate through voltage regulator, export each phase-current reference value i refx;
Wherein, voltage regulator can adopt independent pure ratio (P) controller, proportional integral (PI) controller, ratio resonance (PR) controller, accurate ratio resonant controller, repetitive controller;
Step 6, exports each phase-current reference value by the inverter obtained in step 5 and inverter output current subtracts each other, and obtains each phase current error;
Step 7, inputs to each phase current error obtained in step 6 in current regulator, and carries out adjustment generation modulation signal through current regulator;
Wherein, current regulator can adopt pure proportional controller or pi controller, predictive-current control device, track with zero error device;
Step 8, modulation signal is modulated through modulation module, produces switch controlling signal, thus regulates inverter, ensures that inverter exports the symmetry of three-phase voltage;
Wherein, modulation module can adopt sinusoidal pulse width modulation (SPWM);
In step 3.1, owing to have employed S function, each phase of system is all equal with the frequency of M point, and like this for three-phase imbalance load, no matter how load changes, and each phase output voltage frequency is consistent all the time, and all equals f 0, the change of frequency always can not exceed the scope of permission, and three-phase voltage phase place can not be caused asymmetric; Find out shoulder load value according to load without work value size, and the rated no-load voltage magnitude corresponding according to this adjusts the rated no-load voltage magnitude of other two-phase in real time, makes each phase output voltage amplitude equal simultaneously.And then ensure the symmetry of three-phase voltage.

Claims (9)

1. a Three-Phase Inverter progress control method, is characterized in that, implements according to following steps:
Step 1, gathers the three-phase filter capacitor voltage u of inverter a, u b, u cwith three-phase filter inductance current signal i a, i b, i c;
Step 2, utilize average power to calculate each phase voltage value that module gathers step 1 and current value are averaged power calculation, obtain the output average active power P of each phase of inverter a, P b, P cwith output reactive power Q a, Q b, Q c;
Step 3, by each average active power of the output mutually P obtained in step 2 a, P b, P cwith output reactive power Q a, Q b, Q cthe output three-phase voltage reference value u that droop control obtains inverter is carried out through droop control device refa, u refb, u refc;
Step 4, exports each phase voltage reference value u by inverter refa, u refb, u refcphase voltage u is exported with corresponding inverter a, u b, u csubtract each other, obtain each phase voltage error delta u a, Δ u b, Δ u c;
Step 5, exports each phase voltage error delta u by inverter a, Δ u b, Δ u cinput in voltage regulator, and regulate through voltage regulator, export each phase-current reference value i refx;
Step 6, exports each phase-current reference value by inverter and inverter output current subtracts each other, and obtains each phase current error;
Step 7, inputs to each phase current error in current regulator, and carries out adjustment generation modulation signal through current regulator;
Step 8, modulation signal is modulated through modulation module, produces switch controlling signal, thus regulates inverter, ensures that inverter exports the symmetry of three-phase voltage.
2. a kind of Three-Phase Inverter progress control method according to claim 1, is characterized in that, in described step 2, average power calculates the three-phase filter capacitor voltage u that module adopts power calculation algorithms to gather a, u b, u cwith three-phase filter inductance current signal i a, i b, i cadopt virtual orthographic vector meter algorithm, then through the output average power of the method calculating inverter of low-pass filtering.
3. a kind of Three-Phase Inverter progress control method according to claim 1, is characterized in that, in described step 2, average power calculates module employing instantaneous power integration method and is averaging power.
4. a kind of Three-Phase Inverter progress control method according to claim 1, it is characterized in that, described step 3 is implemented according to following steps:
Step 3.1, droop control device exports average active power P mutually by each a, P b, P ccarry out process and obtain electric voltage frequency, to output reactive power Q a, Q b, Q ccarry out process and obtain voltage magnitude;
Step 3.2, carries out integration the electric voltage frequency that step 3.1 obtains and differs in conjunction with the initial phase angle of three-phase voltage the phase place that 120 degree obtain three-phase voltage, then utilizing three-phase voltage phase place and voltage magnitude to obtain reference voltage vector u refa, u refb, u refc.
5. a kind of Three-Phase Inverter progress control method according to claim 4, it is characterized in that, in step 3.1, droop control device processes in accordance with the following methods for active power;
A, sets up S function; S function is:
f x = 50 + 1 2 - 1 1 + e - &rho; ( P x - P r )
In formula, p x(x=a, b, c) be the active power of output of each phase, f x(x=a, b, c) each phase output frequency; for meritorious sagging coefficient, P rfor inverter rated power;
B, the central point of setting S function is M (P 0, f 0), thus determine a reference curve S; Wherein, P 0=P r/ 2, f 0for rated frequency;
C, calculates offset Δ P, and according to the reference curve S that step 3.2 is determined, determines the S curve of each phase, wherein Δ P=P x-P 0; Be specially:
The average active power p that each is exported mutually xwith p 0relatively, if p x< p 0, then by M point to left | Δ P|, obtains the reference curve of this phase; If P x> P 0, then by M point to right translation | Δ P|, obtains the reference curve of this phase.
6. a kind of Three-Phase Inverter progress control method according to claim 4, it is characterized in that, in step 3.1, droop control device processes reactive power by the following method:
A, according to each average reactive power sizes values exported mutually, judges load mesophase spherule;
B, adopts fixing sagging coefficient n for load mesophase spherule x, and make the amplitude of load mesophase spherule equal rated no-load voltage; Wherein, q rfor inverter exports maximum reactive power;
C, makes the sagging coefficient of other two-phases equal with the sagging coefficient of mesophase spherule, and mesophase spherule curve is carried out upper and lower translation and obtain other two-phase curves.
7. a kind of Three-Phase Inverter progress control method as claimed in any of claims 1 to 6, it is characterized in that, in described step 5, voltage regulator is independent pure proportional controller, PI controller, PR controller, accurate ratio resonant controller or repetitive controller.
8. a kind of Three-Phase Inverter progress control method as claimed in any of claims 1 to 6, it is characterized in that, in described step 7, current regulator is pure proportional controller or pi controller, predictive-current control device or track with zero error device.
9. a kind of Three-Phase Inverter progress control method as claimed in any of claims 1 to 6, is characterized in that, in described step 8, modulation module adopts sinusoidal pulse width modulation.
CN201510180564.2A 2015-04-15 2015-04-15 A kind of Three-Phase Inverter progress control method Expired - Fee Related CN104795826B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110333767A (en) * 2019-06-27 2019-10-15 南京矽力杰半导体技术有限公司 Multiphase power converter
CN110460113A (en) * 2019-07-18 2019-11-15 河海大学 A kind of machinery inertial analogy method of inverter power supply
CN112909994A (en) * 2021-01-22 2021-06-04 江苏固德威电源科技股份有限公司 Unbalanced input and output control method for three-phase inverter
CN115800332A (en) * 2023-01-09 2023-03-14 西安领充创享新能源科技有限公司 Load adjusting method and system

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CN102570489A (en) * 2012-02-29 2012-07-11 中国南方电网有限责任公司调峰调频发电公司 Dynamic power coordination control method for battery energy storage system
CN103904654A (en) * 2014-03-11 2014-07-02 西安理工大学 Combined three-phase inverter circuit parallel operation control method

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Publication number Priority date Publication date Assignee Title
CN102570489A (en) * 2012-02-29 2012-07-11 中国南方电网有限责任公司调峰调频发电公司 Dynamic power coordination control method for battery energy storage system
CN103904654A (en) * 2014-03-11 2014-07-02 西安理工大学 Combined three-phase inverter circuit parallel operation control method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110333767A (en) * 2019-06-27 2019-10-15 南京矽力杰半导体技术有限公司 Multiphase power converter
CN110460113A (en) * 2019-07-18 2019-11-15 河海大学 A kind of machinery inertial analogy method of inverter power supply
CN110460113B (en) * 2019-07-18 2022-08-19 河海大学 Mechanical inertia simulation method of inverter power supply
CN112909994A (en) * 2021-01-22 2021-06-04 江苏固德威电源科技股份有限公司 Unbalanced input and output control method for three-phase inverter
CN112909994B (en) * 2021-01-22 2023-07-11 固德威技术股份有限公司 Unbalanced input and output control method for three-phase inverter
CN115800332A (en) * 2023-01-09 2023-03-14 西安领充创享新能源科技有限公司 Load adjusting method and system

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