CN109995079A - A kind of low voltage ride through control method of virtual synchronous generator - Google Patents

A kind of low voltage ride through control method of virtual synchronous generator Download PDF

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Publication number
CN109995079A
CN109995079A CN201910274010.7A CN201910274010A CN109995079A CN 109995079 A CN109995079 A CN 109995079A CN 201910274010 A CN201910274010 A CN 201910274010A CN 109995079 A CN109995079 A CN 109995079A
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CN
China
Prior art keywords
voltage
module
virtual synchronous
synchronous generator
low
Prior art date
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Pending
Application number
CN201910274010.7A
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Chinese (zh)
Inventor
颜景斌
贾西宁
张龙飞
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Harbin University of Science and Technology
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Harbin University of Science and Technology
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Application filed by Harbin University of Science and Technology filed Critical Harbin University of Science and Technology
Priority to CN201910274010.7A priority Critical patent/CN109995079A/en
Publication of CN109995079A publication Critical patent/CN109995079A/en
Pending legal-status Critical Current

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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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses a kind of low voltage ride through control method of virtual synchronous generator, this method comprises: judging whether low-voltage crossing occurs, if it is, calculating the reactive power for needing to issue, while switching active power given value；Judge whether low-voltage crossing restores, if it is, restoring the given value of active power, reactive power to rated value.A kind of low voltage ride through control method of virtual synchronous generator disclosed by the invention passes through when determining low-voltage crossing generation, it is switched fast the given value of active power and reactive power, virtual synchronous generator is set to issue reactive power, give grid entry point voltage support, shorten system response time, meets national standard.

Description

A kind of low voltage ride through control method of virtual synchronous generator
Technical field
This application involves Electrical Control Technology, specifically, are related to a kind of low-voltage crossing control of virtual synchronous generator Method.
Background technique
In modern power systems, in order to cope with energy crisis, country greatly develops distributed energy, in addition to can be directly to Except customer power supply, it can also be incorporated among bulk power grid.Virtual synchronous generator is the frequency by simulating synchronous generator And voltage control characteristic improves electricity to provide certain inertia and damping characteristic for distributed energy grid-connected system Net stability.
However, national grid requires distributed energy grid-connected system when grid-connected since electric network fault may occur, The function of low-voltage crossing is needed to have, and can quickly be adjusted after electric network fault recovery.Low voltage crossing refers in grid entry point When Voltage Drop, gird-connected inverter is able to maintain grid-connected, or even provides certain reactive power to power grid, supports power grid extensive It is multiple, until power system restoration is normal, so that " passing through " this low-voltage time, improves the reliability of power grid power supply.
Currently, the distributed energy grid-connected system based on virtual synchronous generator does not have low pressure in electric network fault Ride-through capability.
Summary of the invention
The main object of the present invention is to provide a kind of low voltage ride through control method of virtual synchronous generator, passes to solve The virtual synchronous generator of system does not have the problem of low-voltage crossing ability.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of low voltage ride through control method of virtual synchronous generator, including inverter module, LC filter module, top control module, Power computation module, virtual synchronous generator module, voltage and current dual-loop module and modulation module.
The inverter module is voltage source inverter, is exported after LC filter module, through grid-connected impedance direct grid-connected.
The top control module includes amplitude detection module, judgment module and processing module, the amplitude detection module The amplitude of network voltage is calculated, the judgment module judges low-voltage crossing according to the voltage magnitude that amplitude detection module calculates Whether occur or restore, the amplitude Δ U of Voltage Drop is provided when low-voltage crossing occurs, the processing module is used in low pressure Change active power and reactive power setting value when passing through generation.
The power computation module uses the instantaneous power under dq coordinate system to calculate.
The virtual synchronous generator module includes active frequency module, reactive voltage module and three-phase voltage synthesis mould Block, the active frequency module provide phase theta for three-phase voltage synthesis module, and the reactive voltage module is three-phase voltage Synthesis module provides the amplitude E of virtual built-in potential, and the three-phase voltage synthesis module is according to the width of phase theta and virtual built-in potential Value E generates three-phase voltage Eabc, and the positive sequence voltage reference value of dq axis is generated after positive-negative sequence separation and coordinate transform.
The voltage and current dual-loop module includes positive sequence voltage ring, forward-order current ring and negative-sequence current ring, it is described just Sequence voltage ring according to the positive sequence voltage reference value of dq axis generate dq axis forward-order current reference value, the forward-order current ring according to The forward-order current reference value of dq axis generates the positive sequence modulation voltage of dq axis, and the negative-sequence current ring reference value is 0, generates dq axis Negative phase-sequence modulation voltage, positive-negative sequence modulation voltage synthesize three-phase modulations voltage be sent into modulation module.
The modulation module generates modulating wave using SVPWM algorithm and controls inverter module.
The invention has the following beneficial effects: the present invention provides a kind of virtual synchronous generator low-voltage crossing controls Method processed introduces the day that virtual synchronous generator control method makes distributed energy power generation system have synchronous generator grid-connected Right advantage, while low voltage ride through control method is introduced, this method can provide certain nothing for power grid when low-voltage crossing occurs Function power helps network voltage to restore, while supporting the voltage of grid entry point, while exporting three-phase equilibrium electric current.
Detailed description of the invention
Fig. 1 is the low voltage ride through control method entirety control block diagram of virtual synchronous generator.
Fig. 2 is virtual synchronous generator low-voltage crossing top control module schematic diagram.
Fig. 3 is virtual synchronous engine block control block diagram.
Fig. 4 is the voltage and current double -loop control block diagram of virtual synchronous generator.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of low-voltage crossing entirety control block diagram of virtual synchronous machine provided by the invention, including inverter Module, LC filter module, top control module, power computation module, virtual synchronous generator module, voltage and current dual-loop module and tune Molding block.
The power computation module uses the active-power P under dq coordinate systemeAnd reactive power QeIt is sent out as virtual synchronous The output quantity of motor, as shown in formula (1):
In formula, udFor inverter output voltage d axis component, uqFor inverter output voltage q axis component, idFor grid-connected current d axis point Amount, iqFor grid-connected current q axis component.
Fig. 2 is virtual synchronous generator low-voltage crossing top control module schematic diagram provided by the invention, including amplitude detection mould Block 101, judgment module 102 and processing module 103.
The amplitude detection module 101 is used to detect the amplitude U of network voltageg。
The judgment module 102 works as U for judging whether power grid occurs Voltage Dropg>0.9UnWhen, power grid is normally transported Row, works as Ug<0.9UnWhen, it determines and low-voltage crossing occurs.
The processing module 103 is used to modify the given of active power and reactive power according to the result of judgment module Value, as shown in formula (2):
In formula, UgdFor network voltage d axis component, UnFor power grid rated voltage amplitude, S is power system capacity, InFor rated current.
Fig. 3 is virtual synchronous machine control block diagram provided by the invention, the control of virtual synchronous machine by active-frequency control loop and Idle-voltage control loop is constituted, and simulates rotatory inertia, primary frequency modulation characteristic and the voltage adjustment characteristic of synchronous generator, In, Pref、QrefRespectively active power and reactive power reference qref, J are rotary inertia, DpFor damped coefficient, ωnFor specified angle Frequency, K is the inertia coeffeicent of adjustment of field excitation, then shown in virtual synchronous machine mathematical model such as formula (3):
In formula, E is the reference frame of virtual synchronous machine output voltage.
Fig. 4 is that the voltage and current of virtual synchronous machine provided by the invention is bicyclic, the E that will be obtainedabcCarry out positive-negative sequence separation and Coordinate transform obtains positive sequence voltage reference value, obtains the reference value of positive sequence output electric current through PI controller, negative phase-sequence exports electric current Reference value is set as 0, is controlled using PI controller positive sequence and negative-sequence current, obtains the reference of positive sequence and negative sequence voltage Value, through obtaining positive-negative sequence voltage reference value being done and obtained three-phase modulations voltage U after coordinate inverse transformationm, by modulation electricity Force feed enters to obtain PWM waveform in modulation module to control inverter.

Claims (4)

1. a kind of low voltage ride through control method of virtual synchronous generator, which is characterized in that filter mould including inverter module, LC Block, top control module, power computation module, virtual synchronous generator module, voltage and current dual-loop module and modulation module.
2. a kind of low voltage ride through control method of virtual synchronous generator according to claim 1, which is characterized in that described Top control module specifically include:
Amplitude detection module is used to detect the amplitude of network voltage；
Judgment module is specifically used for judging whether low-voltage crossing occurs or extensive according to the voltage magnitude that amplitude detection module calculates It is multiple, the amplitude of Voltage Drop is provided when low-voltage crossing occurs；
Processing module is specifically used for changing the setting value of active power and reactive power when low-voltage crossing occurs.
3. a kind of virtual synchronous generator low voltage ride through control method according to claim 1, which is characterized in that described Voltage and current dual-loop module uses the control method of positive sequence voltage current double-ring and negative-sequence current ring.
4. a kind of virtual synchronous generator low voltage ride through control method according to claim 1, which is characterized in that described Modulation module uses SVPWM method.
CN201910274010.7A 2019-04-08 2019-04-08 A kind of low voltage ride through control method of virtual synchronous generator Pending CN109995079A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910274010.7A CN109995079A (en) 2019-04-08 2019-04-08 A kind of low voltage ride through control method of virtual synchronous generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910274010.7A CN109995079A (en) 2019-04-08 2019-04-08 A kind of low voltage ride through control method of virtual synchronous generator

Publications (1)

Publication Number Publication Date
CN109995079A true CN109995079A (en) 2019-07-09

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Country Status (1)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108092308A (en) * 2017-12-25 2018-05-29 南昌大学 A kind of distributed virtual synchronous generator low voltage traversing control method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108092308A (en) * 2017-12-25 2018-05-29 南昌大学 A kind of distributed virtual synchronous generator low voltage traversing control method

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Application publication date: 20190709