CN107370193A - A kind of voltage source inverter parallel system is idle to divide equally control system and method - Google Patents

A kind of voltage source inverter parallel system is idle to divide equally control system and method Download PDF

Info

Publication number
CN107370193A
CN107370193A CN201710549187.4A CN201710549187A CN107370193A CN 107370193 A CN107370193 A CN 107370193A CN 201710549187 A CN201710549187 A CN 201710549187A CN 107370193 A CN107370193 A CN 107370193A
Authority
CN
China
Prior art keywords
mrow
msub
module
inverter
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710549187.4A
Other languages
Chinese (zh)
Inventor
沈茜
韦徵
姬秋华
王彤
宋飞
王俊辉
俞普德
孙海洋
吕振华
李强
袁晓冬
柳丹
韩华春
黄地
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NANJING NANRUI SOLAR ENERGY TECHNOLOGY Co Ltd
Nanjing NARI Group Corp
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Original Assignee
NANJING NANRUI SOLAR ENERGY TECHNOLOGY Co Ltd
Nanjing NARI Group Corp
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NANJING NANRUI SOLAR ENERGY TECHNOLOGY Co Ltd, Nanjing NARI Group Corp, Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd filed Critical NANJING NANRUI SOLAR ENERGY TECHNOLOGY Co Ltd
Priority to CN201710549187.4A priority Critical patent/CN107370193A/en
Publication of CN107370193A publication Critical patent/CN107370193A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component

Landscapes

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

Abstract

The invention discloses a kind of voltage source inverter parallel system idle respectively control system and method, system includes three-phase inverter main circuit, three pole reactor current acquisition module, inverter outlet voltage acquisition module, for calculating the power computation module of inverter output, load voltage estimation module, voltage and reactive power droop control adjustment module, frequency active power droop control adjustment module, virtual rotation inertia module, integral adjustment module, inverter phase generating module, voltage reference signal generation module, electric current loop reference signal generation module, electric current loop adjustment module, for producing the pulse width modulation module of driving power switch controlling signal.The present invention can be effectively improved because inverter connection line impedance parameter it is inconsistent when, each inverter reactive power in inverter parallel system does not divide equally phenomenon.

Description

A kind of voltage source inverter parallel system is idle to divide equally control system and method
Technical field
The present invention relates to a kind of voltage source inverter parallel system idle respectively control system and method, belong to distributed hair Electricity and micro-capacitance sensor technical field.
Technical background
With the rapid development of the national economy, people are increasing to the demand of electric power, the scale and long distance of power network Power capacity from conveying is constantly increasing.Now, centralized bulk power grid cost is high, operation difficulty is big, reliability is low etc. lacks Falling into will increasingly highlight with the expansion of power network scale, can not increasingly meet quality and electrical safety of the people to supply of electric power With the requirement of reliability.In recent years, massive blackout accident occurs again and again as caused by Single Point of Faliure in power network, fully exposes The fragility of bulk power system, power supply reliability problem have caused the great attention of various countries personnel.In addition, centralized bulk power grid Electricity generation system can not track the change of electric load, and the flexibility of system is relatively poor.Generated electricity if being built for of short duration peak load Factory, required cost is very big, and economic benefit is very low.In order to reduce investment outlay, security and the flexibility of electricity generation system are improved, it is distributed Electricity generation system is arisen at the historic moment.
Distributed power generation be otherwise known as distributing generate electricity or distributed power supply, refer to by be directly arranged at power distribution network or Person is distributed in power generating equipment economy near load, efficiently and reliably generated electricity.Each generating equipment phase in distributed generation system It is mutually independent, its security reliability is drastically increased, compensate for the deficiency of bulk power grid stability.Also, distributed generation system Build and installation cost is relatively low, transmission ＆ distribution electrical loss is relatively low for bulk power grid.Meanwhile distributed generation system peak regulation Can be good, it is simple to operate, it is the strong supplement of bulk power grid and effectively support.And with new energy such as solar energy, wind energy, tide energies Greatly develop, distributed generation system has obtained great application.Thus, distributed generation system will be present and following one All in vital position in national electricity consumption in the section time.
With the fast development of distributed power generation, more and more higher is required to capacity, performance, scalability etc..Inverter As the core generating equipment in distributed generation system, it is developed into necessarily to become from centrally connected power supply to distributed parallel operation Gesture, while inverter parallel technology is that distributed generation system realizes high reliability, high redundancy, high power capacity and enhanced scalability Basis, and the key point of distributed generation system stable operation.
However, when more inverter parallels power to the load, if each inverter connection line impedance is inconsistent, it is based on Each inverter load-sharing that distributed parallel arrangement under traditional droop control strategy is difficult in parallel system is idle Power, will cause each voltage source inverter significantly uneven stream when serious, whole parallel system can not normal work, so as to endanger Evil inverter parallel system reliability.Therefore, voltage source inverter parallel reactive power-sharing control technology is studied for realizing High power system, improving its stability and reliability has important theory significance and practical value.
The content of the invention
The technical problems to be solved by the invention are the defects of overcoming prior art, there is provided a kind of voltage source inverter is in parallel System Reactive Power divides equally control system and method, realizes when each inverter parallel connection line impedance difference, more inverters Parallel system can realize reactive power mean allocation as far as possible, it is ensured that inverter parallel system safe and reliable operation.
In order to solve the above technical problems, the present invention provides, a kind of voltage source inverter parallel system is idle to divide equally control system System, including some three-phase inverter main circuits in parallel, each three-phase inverter main circuit configure 1 inverter three pole reactor Current acquisition module is used for the three pole reactor electric current for gathering inverter, and 1 inverter outlet voltage acquisition module is inverse for gathering Become the three-phase voltage of device, 1 power computation module is used for the active power of output and reactive power for calculating inverter, 1 load Voltage estimation module is used for the load voltage estimate for calculating inverter parallel common point, 1 inverter output voltage-idle work( Rate droop control adjustment module is used to calculate the sagging set-point of reactive power, 1 sagging control of inverter output frequency-active power Adjustment module processed is used to calculate the sagging set-point of active power, and 1 virtual rotation inertia module is used to calculate voltage reference signal Angular frequency, 1 integral adjustment module are used to calculate voltage reference signal amplitude information, and 1 inverter phase generating module is used for Voltage reference signal phase is calculated, 1 voltage reference signal generation module is used to generate voltage reference signal, 1 electric current loop ginseng Signal generation module to be examined to be used to generate current reference signal, 1 electric current loop adjustment module is used to generating inverter modulated signal, and 1 The individual pulse width modulation module for being used to produce driving power switch controlling signal is used for the control for generating control inverter power switch Signal；The three-phase inverter main circuit includes input power and load；
The inverter three pole reactor current acquisition module seals in inductive branch by current sensor, and the inverter goes out Mouthful voltage acquisition module is connected in parallel on required measurement port by voltage sensor, inverter three pole reactor current acquisition module and inverse The output end for becoming device exit potential acquisition module is all connected with power computation module and load voltage estimation module, the load voltage The input of output end access voltage-reactive power droop control adjustment module of estimation module, under the voltage-reactive power The input for the output end access integral adjustment module for controlling to adjust module of hanging down, the output end access electricity of the integral adjustment module The input of pressure reference signal generation module, the output end access electric current loop reference signal of the voltage reference signal generation module The input of generation module, the input of the output end access electric current loop adjustment module of the electric current loop reference signal generation module End, the output end access pulse width modulation module of the electric current loop adjustment module, the frequency-active power droop control regulation mould The input of the output end access of virtual rotary inertia module of block, the output end access inverter of the virtual rotation inertia module The input of phase generating module, output end access frequency-active power droop control of the inverter phase generating module The input of adjustment module.
Voltage source inverter parallel system is idle divide equally control system control method, comprise the following steps：
1) inversion gathered by inverter three pole reactor current acquisition module and inverter outlet voltage acquisition module The three pole reactor electric current i of deviceABCWith three-phase voltage uoABCPower computation module is sent into, calculating to obtain corresponding inverter and export has Work(power poWith reactive power qo, while by three pole reactor electric current iABCWith three-phase voltage uoABCIt is sent into load voltage estimation module meter Calculate the load voltage estimate of inverter parallel common point
2) by load voltage estimateAnd voltagerating amplitude VnIt is sent into output voltage-reactive power droop control Adjustment module obtains the sagging set-point Q of reactive powerd；
3) by voltagerating angular frequencynWith the voltage reference signal angular frequency of virtual rotation inertia module outputoIt is sent into Frequency-active power droop control adjustment module obtains the sagging set-point P of active powerd；
4) by the sagging set-point Q of reactive powerdWith reactive power set-point QrefAnd inverter output reactive power qoOne Voltage reference signal amplitude information V is generated with integral adjustment module is sent intoref；
5) by the sagging set-point P of active powerdWith active power set-point PrefAnd inverter active power of output poOne Voltage reference signal angular frequency is generated with virtual rotation inertia module is sent intoo；
6) by voltage reference signal angular frequencyoIt is sent into inverter phase generating module and produces voltage reference signal phase thetao；
7) by the voltage reference signal phase thetaoWith voltage reference signal amplitude information VrefTogether it is sent into voltage reference signal Generation module obtains voltage reference signal vrefABC；
8) by voltage reference signal vrefABCWith three-phase voltage uoABCElectric current loop reference signal generation module is together sent into produce Current reference signal irefABC；
9) by current reference signal irefABCWith three pole reactor electric current iABCElectric current loop adjustment module is together sent into produce finally Inverter modulated signal vmABC；
10) by inverter modulated signal vmABCWith carrier signal vcTogether it is sent into pulse width modulation module and produces control inverter The control signal d of power switch.
The method that foregoing load voltage estimation module calculates the load voltage estimate of inverter parallel common point is profit With dq conversion modules respectively by inverter three-phase voltage uoABCWith three pole reactor electric current iABCBe transformed to corresponding dq components, i.e., it is inverse Become the d axis components u of device three-phase voltageod, q axis components uoqAnd the d axis components i of three pole reactor electric currentd, q axis components iq, load electricity Press estimateIt can be expressed as accordingly：
Wherein, RlineAnd LlineThe respectively virtual circuit resistance and inductance of this inverter, ωnFor voltagerating angular frequency Rate.
Foregoing voltage-reactive power droop control adjustment module calculates the sagging set-point Q of reactive powerdCalculating formula such as Under：
Wherein, kvFor voltage-idle sagging coefficient.
Foregoing frequency-active power droop control adjustment module calculates the sagging set-point P of active powerdCalculating formula such as Under：
Pd=(ωn-ωo)·kf (3)
Wherein, kfFor frequency-active sagging coefficient.
Foregoing virtual rotation inertia module generation voltage reference signal angular frequencyoExpression formula is as follows：
Wherein, J is virtual rotation inertia, and s represents the complex frequency domain factor.
Foregoing integral adjustment module generation voltage reference signal amplitude information VrefCalculating formula it is as follows：
Wherein, K is integral coefficient.
Foregoing inverter phase generating module generation voltage reference signal phase thetaoCalculating formula it is as follows：
Foregoing voltage reference signal generation module generation voltage reference signal vrefABCCalculating formula it is as follows：
Wherein, vrefA, vrefB, vrefCFor vrefABCThree components.
Foregoing electric current loop reference signal generation module generation current reference signal irefABCCalculating formula it is as follows：
Wherein, L is inverter ac output inductor；
The electric current loop adjustment module generation inverter modulated signal vmABCCalculating formula it is as follows：
Wherein, kpFor electric current loop adjuster proportionality coefficient, kiFor electric current loop adjuster integral coefficient.
What the present invention was reached has the beneficial effect that：
The present invention can be effectively improved because inverter connection line impedance parameter it is inconsistent when, it is each in inverter parallel system Platform inverter reactive power does not divide equally phenomenon, so as to for applied to the voltage source inverter in distributed power generation and micro-capacitance sensor field Parallel Control scheme provides important technical foundation.
Brief description of the drawings
Fig. 1, which is that the inverter parallel system based on load voltage estimation of the present invention is idle, divides equally Control system architecture frame Figure；
Fig. 2 is that load voltage estimation module realizes block diagram；
Fig. 3 is in embodiment, and inverter parallel system is not when using the inventive method, the output emulation of two inverters Schematic diagram, Fig. 3 (a) are that active power emulates schematic diagram, and Fig. 3 (b) is that reactive power emulates schematic diagram, and Fig. 3 (c) is A phase bridge arms Current simulations schematic diagram；
Fig. 4 is in embodiment, and inverter parallel system when using the inventive method, show by the output emulation of two inverters It is intended to, Fig. 4 (a) is that active power emulates schematic diagram, and Fig. 4 (b) is that reactive power emulates schematic diagram, and Fig. 4 (c) is A phases bridge arm electricity Stream emulation schematic diagram.
Embodiment
The invention will be further described below.Following examples are only used for the technical side for clearly illustrating the present invention Case, and can not be limited the scope of the invention with this.
As shown in figure 1, the inverter parallel system based on load voltage estimation of the present invention is idle to divide equally control system, bag Several three-phase inverter main circuits in parallel are included, three-phase inverter main circuit includes input power Uin(in figure, L is with load R Inverter ac output inductor, C are inverter ac output filter capacitor, ZlFor inverter outlet line parameter), it is each Three-phase inverter main circuit all configures 1 inverter three pole reactor current acquisition module, 1 inverter outlet voltage acquisition mould Block, 1 be used for calculate inverter output power computation module, 1 load voltage estimation module, 1 inverter output voltage- Reactive power droop control adjustment module, 1 inverter output frequency-active power droop control adjustment module, 1 virtual turn Dynamic inertia module, 1 integral adjustment module, 1 inverter phase generating module, 1 voltage reference signal generation module, 1 Electric current loop reference signal generation module, 1 electric current loop adjustment module, 1 arteries and veins for being used to produce driving power switch controlling signal Wide modulation module.
The annexation of each module is as follows：Inverter three pole reactor current acquisition module seals in inductance by current sensor Branch road, inverter outlet voltage acquisition module are connected in parallel on required measurement port, inverter three-phase electricity electrification by voltage sensor The output end of stream acquisition module and inverter outlet voltage acquisition module is all connected with power computation module and load voltage estimation mould Block, the input of output end access voltage-reactive power droop control adjustment module of load voltage estimation module, voltage-nothing The input of the output end access integral adjustment module of work(power droop control adjustment module, the output termination of integral adjustment module Enter the input of voltage reference signal generation module, the output end access electric current loop reference signal of voltage reference signal generation module The input of generation module, the input of the output end access electric current loop adjustment module of electric current loop reference signal generation module, electricity Flow the output end access pulse width modulation module of ring adjustment module, the output termination of frequency-active power droop control adjustment module Enter the input of virtual rotation inertia module, the output end of virtual rotation inertia module accesses the defeated of inverter phase generating module Enter end, the input of output end access frequency-active power droop control adjustment module of inverter phase generating module.
The main implementation process of inverter control scheme is described as follows：Inverter three pole reactor current acquisition will be passed through first The inverter output current i that module and inverter outlet voltage acquisition module are obtainedABCWith voltage uoABCIt is sent into power calculation mould Block, which calculates, obtains corresponding inverter active power of output poWith reactive power qo, while by output current iABCWith voltage uoABCSend Enter the load voltage estimate that load voltage estimation module obtains inverter parallel common pointBy load voltage estimateAnd voltagerating amplitude VnBe sent into output voltage-reactive power droop control adjustment module obtain reactive power it is sagging to Definite value Qd；
By voltagerating angular frequencynWith the voltage reference signal angular frequency of virtual rotation inertia module outputoIt is sent into frequency Rate-active power droop control adjustment module obtains the sagging set-point P of active powerd；
By the sagging set-point Q of reactive power of voltage-reactive power droop control adjustment module outputdGiven with reactive power Definite value QrefAnd power computation module calculates the inverter output reactive power q of gainedoTogether it is sent into the generation of integral adjustment module Voltage reference signal amplitude information Vref；
By the sagging set-point P of active power of frequency-active power droop control adjustment module outputdGiven with active power Definite value PrefAnd power computation module calculates the inverter active power of output p of gainedoTogether it is sent into virtual rotation inertia module Generate voltage reference signal angular frequencyo；
By voltage reference signal angular frequencyoIt is sent into inverter phase generating module and produces voltage reference signal phase thetao；
By the phase thetaoWith the voltage reference signal amplitude information V of integral adjustment module generationrefTogether it is sent into Voltage Reference Signal generation module obtains voltage reference signal vrefABC；
By voltage reference signal vrefABCWith the voltage u of inverter outlet voltage acquisition module collectionoABCTogether it is sent into electric current Ring reference signal generation module produces current reference signal irefABC；
By current reference signal irefABCWith the inverter output current of inverter three pole reactor current acquisition module collection iABCTogether it is sent into electric current loop adjustment module and produces final inverter modulated signal vmABC；
Finally by inverter modulated signal vmABCWith carrier signal vcTogether it is sent into pulse width modulation module and produces control inverter The control signal d of power switch.
Wherein, load voltage estimation module specific implementation block diagram as shown in Fig. 2 dq conversion modules respectively by inverter three Phase output voltage uoABCWith three pole reactor electric current iABCCorresponding dq components are transformed to, include the d axis components of inverter output voltage uod, q axis components uoqAnd the d axis components i of inverter outputting inductance electric currentd, q axis components iq, load voltage estimateCan evidence This is expressed as：
In formula, RlineAnd LlineThe respectively virtual circuit resistance and inductance of this inverter, ωnFor voltagerating angular frequency Rate.
Voltage-reactive power droop control adjustment module calculates the sagging set-point Q of reactive powerdCalculating formula it is as follows：
In formula, QdFor the sagging set-point of reactive power, VnFor voltagerating amplitude,For load voltage estimate, kvFor Voltage-idle sagging coefficient.
Frequency-active power droop control adjustment module calculates the sagging set-point P of active powerdCalculating formula it is as follows：
Pd=(ωn-ωo)·kf (3)
In formula, PdFor the sagging set-point of active power, ωnFor voltagerating angular frequency, ωoFor voltage reference signal angular frequency Rate, kfFor frequency-active sagging coefficient.
Virtual rotation inertia module generates voltage reference signal angular frequencyoExpression formula is as follows：
In formula, PrefFor active power set-point, poFor inverter active power of output, J is virtual rotation inertia, and s is represented The complex frequency domain factor.
Integral adjustment module generation voltage reference signal amplitude information VrefCalculating formula it is as follows：
In formula, QrefFor reactive power set-point, qoFor inverter output reactive power, K is integral coefficient.
Inverter phase generating module generates voltage reference signal phase thetaoCalculating formula it is as follows：
Voltage reference signal generation module generation voltage reference signal vrefABCCalculating formula it is as follows：
Wherein, vrefA, vrefB, vrefCFor vrefABCThree components.
Electric current loop reference signal generation module generation current reference signal irefABCCalculating formula it is as follows：
In formula, L is inverter ac output inductor.
Electric current loop adjustment module generation inverter modulated signal vmABCCalculating formula it is as follows：
In formula, kpFor electric current loop adjuster proportionality coefficient, kiFor electric current loop adjuster integral coefficient.
Correctness and feasibility to illustrate the invention, emulation experiment checking is carried out to the control method of the present invention, its Middle simulation parameter is：Inverter parallel system is made up of two inverters, its input voltage UinIt is defeated for 800VDC, two inverters Go out filter inductance LfIt is 0.15mH, output filter capacitor CfIt is 200 μ F (triangular form connection), two inverter outlet lines Parameter ZlRespectively 0.01+j3.14e-3, 0.02+j6.28e-3, threephase load 0.2+j0.314.
Fig. 3 gives when not using control method proposed by the invention, two inverter active power of output Fig. 3 (a), Reactive power Fig. 3 (b), output one phase (A phases) bridge arm current Fig. 3 (c) simulation result schematic diagrams, two curves respectively represent one it is inverse Become device.
Fig. 4 is given when simulation time is the 1s moment, after control method proposed by the invention, two inverters Active power of output Fig. 4 (a), reactive power Fig. 4 (b), output one phase (A phases) bridge arm current 4 (c) simulation result schematic diagram, two Bar curve respectively represents an inverter.
The simulation waveform that Fig. 3 is provided is shown：When not using control method of the present invention, because line parameter circuit value is inconsistent, two Serious reactive power be present and do not divide equally situation in inverter, meanwhile, there is also serious for the same phase output current of two inverters Inequality stream, two inverters can not load-sharing power.The simulation waveform that Fig. 4 is provided is shown：When simulation time is the 1s moment, When being operated in using the inverter parallel system of control method of the present invention under same working condition, two inverters export idle work( Rate is obtained dividing equally well rapidly and controlled, and the equal flow phenomenon of the same phase output current of two inverters has also obtained greatly changing It is kind.Simulation result shows：Under the control method of the present invention, even if two inverter connection line parameters are different, two inversions Device still realizes well to be controlled dividing equally for bearing power, substantially increased the functional reliability of inverter parallel system.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these are improved and deformation Also it should be regarded as protection scope of the present invention.

Claims (10)

  1. Divide equally control system 1. a kind of voltage source inverter parallel system is idle, it is characterised in that including some three-phases in parallel Converter main circuit, each three-phase inverter main circuit configure 1 inverter three pole reactor current acquisition module and are used to gather The three pole reactor electric current of inverter, 1 inverter outlet voltage acquisition module are used for the three-phase voltage for gathering inverter, 1 work( Rate computing module is used for the active power of output and reactive power for calculating inverter, and 1 load voltage estimation module is used to calculate The load voltage estimate of inverter parallel common point, 1 inverter output voltage-reactive power droop control adjustment module are used In calculating the sagging set-point of reactive power, 1 inverter output frequency-active power droop control adjustment module has for calculating The sagging set-point of work(power, 1 virtual rotation inertia module are used to calculate voltage reference signal angular frequency, 1 integral adjustment mould Block is used to calculate voltage reference signal amplitude information, and 1 inverter phase generating module is used to calculate voltage reference signal phase, 1 voltage reference signal generation module is used to generate voltage reference signal, and 1 electric current loop reference signal generation module is used to generate Current reference signal, 1 electric current loop adjustment module are used to generate inverter modulated signal, and 1 is used to produce driving power switch The pulse width modulation module of control signal is used for the control signal for generating control inverter power switch；The main electricity of three-phase inverter Road includes input power and load；
    The inverter three pole reactor current acquisition module seals in inductive branch, the inverter outlet electricity by current sensor Pressure acquisition module is connected in parallel on required measurement port, inverter three pole reactor current acquisition module and inverter by voltage sensor The output end of exit potential acquisition module is all connected with power computation module and load voltage estimation module, the load voltage estimation The input of output end access voltage-reactive power droop control adjustment module of module, the sagging control of voltage-reactive power The input of the output end access integral adjustment module of adjustment module processed, the output end access voltage ginseng of the integral adjustment module Examine the input of signal generation module, the output end access electric current loop reference signal generation of the voltage reference signal generation module The input of module, the input of the output end access electric current loop adjustment module of the electric current loop reference signal generation module, institute The output end access pulse width modulation module of electric current loop adjustment module is stated, the frequency-active power droop control adjustment module The input of output end access of virtual rotary inertia module, the output end access inverter phase of the virtual rotation inertia module The input of generation module, output end access frequency-active power droop control regulation of the inverter phase generating module The input of module.
  2. 2. based on the idle control method for dividing equally control system of the voltage source inverter parallel system described in claim 1, it is special Sign is, comprises the following steps：
    1) inverter that is gathered by inverter three pole reactor current acquisition module and inverter outlet voltage acquisition module Three pole reactor electric current iABCWith three-phase voltage uoABCPower computation module is sent into, calculates and obtains corresponding inverter output wattful power Rate poWith reactive power qo, while by three pole reactor electric current iABCWith three-phase voltage uoABCIt is inverse to be sent into the calculating of load voltage estimation module Become the load voltage estimate of device parallel connection common point
    2) by load voltage estimateAnd voltagerating amplitude VnIt is sent into output voltage-reactive power droop control regulation Module obtains the sagging set-point Q of reactive powerd；
    3) by voltagerating angular frequencynWith the voltage reference signal angular frequency of virtual rotation inertia module outputoIt is sent into frequency Rate-active power droop control adjustment module obtains the sagging set-point P of active powerd；
    4) by the sagging set-point Q of reactive powerdWith reactive power set-point QrefAnd inverter output reactive power qoTogether send Enter integral adjustment module generation voltage reference signal amplitude information Vref；
    5) by the sagging set-point P of active powerdWith active power set-point PrefAnd inverter active power of output poTogether send Enter virtual rotation inertia module generation voltage reference signal angular frequencyo；
    6) by voltage reference signal angular frequencyoIt is sent into inverter phase generating module and produces voltage reference signal phase thetao；
    7) by the voltage reference signal phase thetaoWith voltage reference signal amplitude information VrefTogether it is sent into voltage reference signal generation Module obtains voltage reference signal vrefABC；
    8) by voltage reference signal vrefABCWith three-phase voltage uoABCTogether it is sent into electric current loop reference signal generation module and produces electric current Reference signal irefABC；
    9) by current reference signal irefABCWith three pole reactor electric current iABCTogether it is sent into electric current loop adjustment module and produces finally inverse Become device modulated signal vmABC；
    10) by inverter modulated signal vmABCWith carrier signal vcTogether it is sent into pulse width modulation module and produces control inverter power The control signal d of switch.
  3. 3. control method according to claim 2, it is characterised in that the load voltage estimation module calculates inverter simultaneously The method for joining the load voltage estimate of common point is, using dq conversion modules respectively by inverter three-phase voltage uoABCAnd three-phase Inductive current iABCIt is transformed to the d axis components u of corresponding dq components, i.e. inverter three-phase voltageod, q axis components uoqAnd three-phase The d axis components i of inductive currentd, q axis components iq, load voltage estimateIt can be expressed as accordingly：
    <mrow> <msub> <mover> <mi>V</mi> <mo>^</mo> </mover> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>u</mi> <mrow> <mi>o</mi> <mi>d</mi> </mrow> </msub> <mo>-</mo> <mrow> <mo>(</mo> <msub> <mi>i</mi> <mi>d</mi> </msub> <mo>&amp;CenterDot;</mo> <msub> <mi>R</mi> <mrow> <mi>l</mi> <mi>i</mi> <mi>n</mi> <mi>e</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>i</mi> <mi>q</mi> </msub> <mo>&amp;CenterDot;</mo> <msub> <mi>&amp;omega;</mi> <mi>n</mi> </msub> <msub> <mi>L</mi> <mrow> <mi>l</mi> <mi>i</mi> <mi>n</mi> <mi>e</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
    Wherein, RlineAnd LlineThe respectively virtual circuit resistance and inductance of this inverter, ωnFor voltagerating angular frequency.
  4. 4. control method according to claim 2, it is characterised in that the voltage-reactive power droop control regulation mould Block calculates the sagging set-point Q of reactive powerdCalculating formula it is as follows：
    <mrow> <msub> <mi>Q</mi> <mi>d</mi> </msub> <mo>=</mo> <mrow> <mo>(</mo> <msub> <mi>V</mi> <mi>n</mi> </msub> <mo>-</mo> <msub> <mover> <mi>V</mi> <mo>^</mo> </mover> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>&amp;CenterDot;</mo> <msub> <mi>k</mi> <mi>v</mi> </msub> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
    Wherein, kvFor voltage-idle sagging coefficient.
  5. 5. control method according to claim 2, it is characterised in that the frequency-active power droop control regulation mould Block calculates the sagging set-point P of active powerdCalculating formula it is as follows：
    Pd=(ωn-ωo)·kf (3)
    Wherein, kfFor frequency-active sagging coefficient.
  6. 6. control method according to claim 2, it is characterised in that the virtual rotation inertia module generates Voltage Reference Signal angular frequencyoExpression formula is as follows：
    <mrow> <msub> <mi>&amp;omega;</mi> <mi>o</mi> </msub> <mo>=</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>d</mi> </msub> <mo>+</mo> <msub> <mi>P</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>p</mi> <mi>o</mi> </msub> <mo>)</mo> </mrow> <mo>&amp;CenterDot;</mo> <mfrac> <mn>1</mn> <mrow> <msub> <mi>J&amp;omega;</mi> <mi>n</mi> </msub> <mi>s</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
    Wherein, J is virtual rotation inertia, and s represents the complex frequency domain factor.
  7. 7. control method according to claim 2, it is characterised in that the integral adjustment module generates voltage reference signal Amplitude information VrefCalculating formula it is as follows：
    <mrow> <msub> <mi>V</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mo>=</mo> <mrow> <mo>(</mo> <msub> <mi>Q</mi> <mi>d</mi> </msub> <mo>+</mo> <msub> <mi>Q</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>q</mi> <mi>o</mi> </msub> <mo>)</mo> </mrow> <mo>&amp;CenterDot;</mo> <mfrac> <mn>1</mn> <mrow> <mi>K</mi> <mi>s</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>5</mn> <mo>)</mo> </mrow> </mrow>
    Wherein, K is integral coefficient.
  8. 8. control method according to claim 2, it is characterised in that the inverter phase generating module generation voltage ginseng Examine signal phase θoCalculating formula it is as follows：
    <mrow> <msub> <mi>&amp;theta;</mi> <mi>o</mi> </msub> <mo>=</mo> <msub> <mi>&amp;omega;</mi> <mi>o</mi> </msub> <mo>&amp;CenterDot;</mo> <mfrac> <mn>1</mn> <mi>s</mi> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>6</mn> <mo>)</mo> </mrow> <mo>.</mo> </mrow>
  9. 9. control method according to claim 2, it is characterised in that the voltage reference signal generation module generates voltage Reference signal vrefABCCalculating formula it is as follows：
    <mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>v</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> <mi>A</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <msub> <mi>&amp;theta;</mi> <mi>o</mi> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>v</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> <mi>B</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <msub> <mi>&amp;theta;</mi> <mi>o</mi> </msub> <mo>-</mo> <mn>120</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>v</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> <mi>C</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <msub> <mi>&amp;theta;</mi> <mi>o</mi> </msub> <mo>+</mo> <mn>120</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>7</mn> <mo>)</mo> </mrow> </mrow>
    Wherein, vrefA, vrefB, vrefCFor vrefABCThree components.
  10. 10. control method according to claim 2, it is characterised in that the electric current loop reference signal generation module generation Current reference signal irefABCCalculating formula it is as follows：
    <mrow> <msub> <mi>i</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> <mi>A</mi> <mi>B</mi> <mi>C</mi> </mrow> </msub> <mo>=</mo> <mrow> <mo>(</mo> <msub> <mi>v</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> <mi>A</mi> <mi>B</mi> <mi>C</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>u</mi> <mrow> <mi>o</mi> <mi>A</mi> <mi>B</mi> <mi>C</mi> </mrow> </msub> <mo>)</mo> </mrow> <mfrac> <mn>1</mn> <mrow> <mi>s</mi> <mo>&amp;CenterDot;</mo> <mi>L</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>8</mn> <mo>)</mo> </mrow> </mrow>
    Wherein, L is inverter ac output inductor；
    The electric current loop adjustment module generation inverter modulated signal vmABCCalculating formula it is as follows：
    <mrow> <msub> <mi>v</mi> <mrow> <mi>m</mi> <mi>A</mi> <mi>B</mi> <mi>C</mi> </mrow> </msub> <mo>=</mo> <mrow> <mo>(</mo> <msub> <mi>i</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> <mi>A</mi> <mi>B</mi> <mi>C</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>i</mi> <mrow> <mi>A</mi> <mi>B</mi> <mi>C</mi> </mrow> </msub> <mo>)</mo> </mrow> <mrow> <mo>(</mo> <msub> <mi>k</mi> <mi>p</mi> </msub> <mo>+</mo> <mfrac> <msub> <mi>k</mi> <mi>i</mi> </msub> <mi>s</mi> </mfrac> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>9</mn> <mo>)</mo> </mrow> </mrow>
    Wherein, kpFor electric current loop adjuster proportionality coefficient, kiFor electric current loop adjuster integral coefficient.
CN201710549187.4A 2017-07-07 2017-07-07 A kind of voltage source inverter parallel system is idle to divide equally control system and method Pending CN107370193A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710549187.4A CN107370193A (en) 2017-07-07 2017-07-07 A kind of voltage source inverter parallel system is idle to divide equally control system and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710549187.4A CN107370193A (en) 2017-07-07 2017-07-07 A kind of voltage source inverter parallel system is idle to divide equally control system and method

Publications (1)

Publication Number Publication Date
CN107370193A true CN107370193A (en) 2017-11-21

Family

ID=60306098

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710549187.4A Pending CN107370193A (en) 2017-07-07 2017-07-07 A kind of voltage source inverter parallel system is idle to divide equally control system and method

Country Status (1)

Country Link
CN (1) CN107370193A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108459202A (en) * 2017-12-16 2018-08-28 西安翌飞核能装备股份有限公司 A kind of high-precision detecting method of active power and reactive power
CN108494584A (en) * 2018-02-26 2018-09-04 武汉武新电气科技股份有限公司 The Communication topology and communication control method of multiple module paralleling active inversion device
CN109193810A (en) * 2018-09-06 2019-01-11 易事特集团股份有限公司 Synchronous inverter control method, apparatus and system
CN111628512A (en) * 2020-05-19 2020-09-04 国网浙江省电力有限公司湖州供电公司 Control method of energy storage system
CN113472191A (en) * 2021-07-01 2021-10-01 浙江国研智能电气有限公司 Soft switching inverter control method and system with any power factor
CN117595335A (en) * 2023-10-19 2024-02-23 上海勘测设计研究院有限公司 Control method and system for parallel operation of grid-structured energy storage converters
CN117674174A (en) * 2022-08-24 2024-03-08 南京南瑞继保电气有限公司 Control method and system of network-structured STATCOM

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2483879A (en) * 2010-09-22 2012-03-28 Qingchang Zhong Proportional load sharing for inverters
CN104682429A (en) * 2015-02-04 2015-06-03 南京南瑞太阳能科技有限公司 Voltage source inverter parallel control system
CN105811470A (en) * 2016-04-27 2016-07-27 南京南瑞太阳能科技有限公司 Virtual synchronous machine control system and control method under unbalanced power grid condition

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2483879A (en) * 2010-09-22 2012-03-28 Qingchang Zhong Proportional load sharing for inverters
CN104682429A (en) * 2015-02-04 2015-06-03 南京南瑞太阳能科技有限公司 Voltage source inverter parallel control system
CN105811470A (en) * 2016-04-27 2016-07-27 南京南瑞太阳能科技有限公司 Virtual synchronous machine control system and control method under unbalanced power grid condition

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张继红，等: "利用公共耦合点电压估计的微电网逆变器下垂控制策略", 《大电机技术》 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108459202A (en) * 2017-12-16 2018-08-28 西安翌飞核能装备股份有限公司 A kind of high-precision detecting method of active power and reactive power
CN108494584A (en) * 2018-02-26 2018-09-04 武汉武新电气科技股份有限公司 The Communication topology and communication control method of multiple module paralleling active inversion device
CN108494584B (en) * 2018-02-26 2021-03-16 武汉武新电气科技股份有限公司 Communication control method and system of multi-module parallel active inverter
CN109193810A (en) * 2018-09-06 2019-01-11 易事特集团股份有限公司 Synchronous inverter control method, apparatus and system
CN109193810B (en) * 2018-09-06 2022-04-12 易事特集团股份有限公司 Synchronous inverter control method, device and system
CN111628512A (en) * 2020-05-19 2020-09-04 国网浙江省电力有限公司湖州供电公司 Control method of energy storage system
CN113472191A (en) * 2021-07-01 2021-10-01 浙江国研智能电气有限公司 Soft switching inverter control method and system with any power factor
CN113472191B (en) * 2021-07-01 2022-09-27 浙江国研智能电气有限公司 Soft switching inverter control method and system with any power factor
CN117674174A (en) * 2022-08-24 2024-03-08 南京南瑞继保电气有限公司 Control method and system of network-structured STATCOM
CN117674174B (en) * 2022-08-24 2024-06-18 南京南瑞继保电气有限公司 Control method and system of network-structured STATCOM
CN117595335A (en) * 2023-10-19 2024-02-23 上海勘测设计研究院有限公司 Control method and system for parallel operation of grid-structured energy storage converters
CN117595335B (en) * 2023-10-19 2024-06-18 上海勘测设计研究院有限公司 Control method and system for parallel operation of grid-structured energy storage converters

Similar Documents

Publication Publication Date Title
CN107370193A (en) A kind of voltage source inverter parallel system is idle to divide equally control system and method
CN105914778B (en) Microgrid inverter multi-loop control method based on virtual synchronous generator
CN107425553A (en) Idle respectively control system and method based on voltage source inverter parallel system
CN107591834A (en) Based on the group string data of virtual synchronous machine without energy storage photovoltaic generating system control method
CN103904676B (en) The droop control method of a kind of VSC-HVDC
CN105119309B (en) Suitable for the synchronous inverter control system under unbalanced power supply operating mode
CN106374528A (en) Microgrid dispersing type control policy model based on improved droop control
CN104953801B (en) Voltage-source type combining inverter current harmonics elimination device and method
CN104716886A (en) Virtual impedance voltage converter-based control method of virtual synchronous motor
CN110233500A (en) Virtual synchronous generator off-network is switched to grid-connected method
CN102983620B (en) A kind of AuCT and control method for parallel thereof
CN106300435B (en) The single-phase multi-inverter parallel system of isolated microgrid and its distributed control method
CN104682429B (en) Voltage source inverter parallel control system
CN102891500A (en) Parallel control method of three-phase two-level inverter with isolation transformers
CN106026196A (en) Multi-virtual synchronous generator parallel network control method based on inverter
CN106712100A (en) Perturbation observation-based control method for virtual grid-connected synchronous inverter and control system
CN108280271A (en) THE UPFC equivalent modeling method based on switch periods average principle
CN105958544A (en) Non-AC voltage sensor control method of grid-connected inverter
CN107623458A (en) A kind of virtual synchronous electric moter voltage source transverter minimum current stress control method
CN106130072A (en) A kind of have bank electricity and the composite power source of energy feedback function
CN107910889A (en) A kind of grid-connected control method of photovoltaic micro
CN104810854B (en) Method for coordinating and controlling power between series-connected micro-grid and micro-sources of series-connected micro-grid
CN103259290B (en) A kind of double-fed generator net side converter direct voltage control method of no phase-locked loop
CN106953361A (en) Exchange micro-grid operational control method and device
CN110198046A (en) A kind of modular multilevel matrix form converter bridge arm Current Decoupling method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20171121