CN105958543B - A kind of control, experiment and emulation mode promoting new-energy grid-connected stability - Google Patents
A kind of control, experiment and emulation mode promoting new-energy grid-connected stability Download PDFInfo
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- 238000000034 method Methods 0.000 claims abstract description 17
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- 230000001360 synchronised effect Effects 0.000 claims description 64
- 238000010248 power generation Methods 0.000 claims description 7
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- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000005662 electromechanics Effects 0.000 claims 1
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- 230000035699 permeability Effects 0.000 description 7
- 238000013016 damping Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
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- H02J3/386—
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention belongs to new energy grid-connected power technical fields more particularly to a kind of for promoting the control, experiment and emulation mode of new-energy grid-connected stability.With new energy by motor driven generator, mutual relation of electric voltage, active power and the parameter of electric machine relationship of split-phase motor and generator calculate generator rotor angle, control active power transfer by source net phase difference method.With frequency converter and four-quadrant programmable power supply simulation new energy and power grid；After stability of grid connection operation, the phase of frequency converter output voltage is adjusted, measures active power transfer amount until rated value, observation motor transimission power variation.New energy side is emulated using phase-adjustable inverter, and grid side is infinitely great power supply, using automatic magnetic exciting, in system stable operation, is changed the active transmission instruction of inverter, is observed active transmission, the variation of revolving speed, source net phase difference.This method can effectively promote the rotatory inertia of Thief zone new energy power grid, enhance grid stability.
Description
Technical field
The invention belongs to new energy grid-connected power technical field more particularly to a kind of controls for promoting new-energy grid-connected stability
System, experiment and emulation mode.
Background technique
In face of the dual-pressure of energy crisis and environmental pollution, develops and uses renewable energy and optimizes and revises energy resource structure,
Global energy-economics-environmental sustainable development direction is pushed by becoming.Wind-power electricity generation is always maintained at world's growth in recent years
The status of the most fast energy, wind-powered electricity generation total installation of generating capacity in China's is the first in the world at present, and wind-powered electricity generation will become one of the five big power supplys of China.
However, Wind Power Generation Industry, which develops unbalanced problem, gradually to be shown as installed capacity of wind-driven power continues to increase.Large-scale wind power concentration is opened
Hair has resulted in wind-powered electricity generation excess capacity, and power grid construction lags, and trans-regional ability to transmit electricity is insufficient and energy resource structure is single, lacks
The problems such as peak modulation capacity, is as the current key factor for restricting wind-electricity integration and consumption.The grid-connected bottleneck of wind-powered electricity generation and market consumption are asked
Topic starts to highlight, and " abandonment " phenomenon is generally existing.It is not only China now, the above problem restricts the hair of whole world wind-powered electricity generation industry
Exhibition.Although wind-powered electricity generation industry development experience throe, making rational planning for, configuring by power grid, extensive base develop and point
Dissipate under the development model that formula exploitation combines, wind-electricity integration consumption problem will be solved gradually, therefore wind-powered electricity generation be still it is following most
Potential new energy.
People generally call new energy electric power in network system proportion the permeability of new energy electric power, in the present invention
In, high permeability power grid refers to the network system for having high proportion new energy electric power to access, and low-permeability power grid refers to only low ratio
The network system of example new energy electric power access.People are arrived by practice knowledge, the network system of low-permeability and zero infiltration
The performance of the network system of rate relatively, still, people also it is envisioned that, the network system of high permeability and zero permeability
Network system have essence difference.
After solving the problems, such as wind-electricity integration consumption, power grid apoplexy electro-osmosis rate can be further increased, large-scale wind power field collection
Electric power netting safe running will be faced with new challenges again after middle access.The intrinsic intermittence of wind power and fluctuation and Wind turbines
Lack to the effective tenability of system, potential threaten can be generated to the transient stability of the regional power grid containing wind-powered electricity generation.Cause
This, lays in wind-electricity integration technology to cope with the following electric power netting safe running demand be the necessity for avoiding wind-powered electricity generation from occurring development bottleneck again
Measure.After gradually being solved with Wind turbines fault traversing problem, in high wind-powered electricity generation permeability zones power grid, the peak regulation of system
The problems such as frequency modulation and oscillation of power, receives wind-powered electricity generation the principal element of ability as power grid is influenced.And the inertia of electric system and
Damping is then the important parameter of multilayer output feedback network in system frequency modulation and oscillatory process, and frequency becomes after inertia can reduce active mutation
The low-frequency oscillation after grid disturbance can be effectively suppressed in the rate and amplitude of change, system damping.For conventional synchronous generating set, it is used to
Property be its own intrinsic characteristic and without increasing additional controlling unit, and damping control is by increasing in field regulator
Power system stabilizer, PSS (power system stabilizer, PSS) is realized.But currently, simultaneously based on electronic power convertor
The variable-speed wind-power unit of net does not have the ability of inertia and damping system oscillation of power, after extensive infiltration power grid, and can drop
The inertia of low system and damping more exacerbate the stability problem of Operation of Electric Systems.
Summary of the invention
New-energy grid-connected stability is promoted in order to increase new-energy grid-connected inertia, promotes new energy the invention proposes a kind of
Control, experiment and the emulation mode of source stability of grid connection.
It is a kind of for promoting the control method of new-energy grid-connected stability, comprising:
Step 1 provides electric energy with new energy for synchronous motor, and synchronous motor comes as prime mover of synchronous generator
Driving synchronous generator power generation is connected to the grid, and constitutes motor train；
Step 2, the mutual relation of electric voltage for analyzing synchronous motor and synchronous generator, analysis motor train transmission are new
Relationship between the active power that the energy is issued and the parameter of electric machine calculates the generator rotor angle of synchronous motor and synchronous generator, leads to
Cross the active power transfer of the method control motor train of change source net phase difference；
Step 3 establishes closed loop source net phase control method, realizes the power closed-loop control to motor train.
It is a kind of for promoting the experimental method of new-energy grid-connected stability, comprising:
Frequency converter, synchronous motor M, synchronous generator G, four-quadrant programmable power supply are sequentially connected to constitute by step 1
Motor train, starting subsidiary engine DM are connected with synchronous motor M, are simulated respectively newly with frequency converter and four-quadrant programmable power supply
The energy and power grid；
Synchronous motor M is dragged to synchronous speed using starting subsidiary engine DM by step 2, and grid-connected with frequency converter, is then removed and is opened
Dynamic subsidiary engine DM, is run by transducer drive motor train；Adjust synchronous generator G excitation, realize synchronous generator G and
Four-quadrant programmable power supply it is grid-connected；
After step 3, stability of grid connection operation, at the uniform velocity adjusting frequency converter output voltage U1Phase, make source net phase difference gradually
Increase, measure the single-phase active power transfer amount of motor train during this, until synchronous motor M active power reaches
Until its rated value；Motor train transimission power is observed to change with source net phase difference.
It is a kind of for promoting the emulation mode of new-energy grid-connected stability, comprising:
Step 1 provides electric energy with new energy for synchronous motor, and synchronous motor comes as prime mover of synchronous generator
Driving synchronous generator power generation is connected to the grid, and establishes motor train simulation model；
Step 2, new energy side are emulated using phase-adjustable power supply, and grid side is infinitely great power supply, synchronous motor and same
It walks generator excited system and uses automatic magnetic exciting, to maintain motor stabilizing to run and reduce reactive power exchange as control target；
Step 3 changes phase in system stable operation with the active transmission instruction control new energy side of synchronous generator
The active transmission instruction of regulated power supply, the active transmission variation of observation synchronous generator, synchronous motor, motor train revolving speed become
Change, the variation of source net phase difference.
Motor train control method of the invention, can be provided using motor train promotion grid stability
Row is supported, the rotatory inertia of Thief zone new energy power grid can be effectively promoted, and enhances grid stability；With frequency converter and four-quadrant
Limit programmable power supply simulates new energy and power grid respectively to realize the validation verification of control method, it was demonstrated that is calculated by phase controlling
The firm power transmission of motor train may be implemented in method.
Detailed description of the invention
Fig. 1 is the main schematic structure diagram of motor train
Fig. 2 is motor train no load test built-in potential phasor diagram
Fig. 3 is phase controlling phasor diagram when motor train increases active
Fig. 4 is motor train source net phase controlling structure chart
Fig. 5 is the grid-connected experimental configuration of motor train
Fig. 6 is the relational graph of source net phase difference and the active transmission of motor
Fig. 7 is the grid-connected steady-state operation simulating schematic diagram of motor train
Fig. 8 is motor active transmission variation diagram when the grid-connected steady-state operation of large-size machine train emulates
Fig. 9 is motor speed change figure when the grid-connected steady-state operation of large-size machine train emulates
Figure 10 is source net phase difference variation diagram when the grid-connected steady-state operation of large-size machine train emulates
Specific embodiment
With reference to the accompanying drawing, embodiment is described in detail.
The object of the present invention is to provide a kind of grid connected structure control method for promoting high new energy permeability grid stability,
With reference to the accompanying drawing, technology contents of the invention are described in further detail.
Problem is lacked for the inertia of high permeability new energy power grid, around how to promote this key problem of inertia, originally
Invention proposes the stability solution based on motor train.Motor and synchronous generator are used in motor train
Coaxially connected electricity generation system, wherein new energy provides electric energy for motor, and the prime mover of motor as synchronous generator drives
Engine alternator power generation is connected to the grid, since direct current generator and asynchronous machine are unable to satisfy wanting for electrical power system transmission capacity
It asks, the present invention uses synchronous motor-synchronous generator system.
Motor-synchronous generator system can provide enough inertia for new energy power grid and support, motor with it is synchronous
The control system (such as governor, excitation controller, stability controller, automatic voltage regulator) of generator is that power grid is all kinds of steady
It is qualitative to provide safeguard.Fig. 1 is the schematic diagram of main scheme.
New energy has fluctuation, in the case where input power fluctuation, needs to prove the active defeated of motor train
It out whether can be controllable and follows.Load angle characteristic is the underlying issue of synchronous generator operation.Theoretical analysis shows that due to two machines
Rotor coaxial connection, when steady-state operation, the built-in potential E of motor1、E2Will simultaneously, at the same speed, rotating Vortex.It is measured by no load test
Phase relation is as shown in Fig. 2, change U1Phase, U2To rotating Vortex therewith, U2The angle of rotation is U1The phase of change, with
Theory analysis is consistent.Generator rotor angle δ1And δ2It is around U1、U2A fan-shaped distribution is presented.
At this point, to change output power, the generator rotor angle δ of two machines1、δ2No-load voltage ratio can occur, δ will be presented in variation transient process1With
δ2The fan-shaped of composition is expanded or shrinks to both sides.For the reliable transmission and control for realizing active power, it is necessary to δ1And δ2It controls respectively
System.Therefore, the present invention proposes the motor train active power controller method controlled based on synchronous motor end voltage-phase,
Pass through the converter Control U of new energy side1Phase, thus effectively control synchronous motor generator rotor angle δ1, pass through U1And U2's
Decoupling control, and then control the generator rotor angle δ of synchronous generator2, as shown in Figure 3.
Since two rotor axis of electric are rigidly connected, the built-in potential relative position of two synchronous motors is fixed, therefore same
When adjust two motor generator rotor angles, if assume grid phase it is constant, must control new energy outlet gird-connected inverter output electricity
The phase angle of pressure, to change UMAnd UgridBetween phase difference, thus the present invention proposes control system as shown in Figure 4.Pass through acquisition
Device measures three-phase voltage current, calculates power of motor, and then calculate the generator rotor angle of 2 motors, is adjusted by phase control algorithm
Section modulation wave amplitude and phase, eventually by the active of space vector modulation control motor transmission.
For the feasibility for verifying this control algolithm, experiment and simulating, verifying have been carried out to motor series connection grid-connected system respectively.
1) experimental verification: in order to be verified the control adjustable motor string of motor train two sides alternating voltage phase
The active transmission of system is contacted, the grid-connected experiment of motor train is designed.Experimental system structure is as shown in figure 5, to realize phase mode
Quasi- control, simulates new energy and power grid, two motors of motor train using frequency converter, four-quadrant programmable power supply respectively
It is the synchronous motor of specified 170W.
Experimentation is as follows: as shown in Fig. 5, synchronous motor M is dragged to by synchronous speed using starting subsidiary engine DM first, and
It is grid-connected with frequency converter, DM is then removed, is run by transducer drive motor train M-G；Adjust encouraging for synchronous generator G
Magnetic realizes the grid-connected of G and programmable power supply.Motor train M-G and programmable power supply grid-connected moment, source net phase difference (U1
And U4Phase difference) be 16.01 °, stability of grid connection operation after, at the uniform velocity adjusting frequency converter output voltage U1Phase, make source net phase
Difference is gradually increased, and measures the single-phase active transmission quantity of motor train M-G during this.Experiment, which is performed until motor, to be had
Until function reaches its rated value, experimental data is as shown in Figure 6.
As shown in fig. 6, without active exchange, motor, which absorbs about 24W, to be had for generator port before motor train is grid-connected
Function is mainly used for motor train itself and rotates.After grid-connected, by adjusting source net phase difference, as supply voltage phase is super
The active transmitting of the increase of preceding network voltage, motor and generator increases.Comparison is it is found that motor absorbs active and power generation
It is equal that machine sends active incrementss.Above-mentioned experiment shows that motor string may be implemented by adjusting new energy output voltage phase
The transmission and adjusting of connection system and network re-active power.
2) according to control algolithm described previously, 600MW motor series connection simulation model, basic schematic diagram simulating, verifying: are established
As shown in fig. 7, wherein new energy side is indicated using phase-adjustable power supply, grid side is infinitely great power supply, motor and generator
Excitation system uses automatic magnetic exciting, to maintain motor stabilizing to run and reduce reactive power exchange as control target.With generated power
Transmission instruction control source side changes the active transmission instruction of inverter, observes generator in system stable operation, electronic
The active transmission variation of machine, motor train rotation speed change, the variation of source net phase difference.The control that phase-adjustable inverter uses
Mode is source net phase control method.
Simulation result is as shown in figs. 8-10.In emulation, instructing active transmission from 600MW in 100s becomes 400MW,
By adjusting the adjustable active transmission of source net phase difference, steady-state operation is entered after transition stage.As shown in Figure 8, generator
Transmit it is active can accurately follow active transmission to instruct, motor transmits active slightly above instruction value since system loss exists,
But still in stable state.As shown in Figure 9, under active mutation status, motor train can keep stabilization of speed, Ke Yiyou
Effect provides inertia for system and supports.As shown in Figure 10, when active transmission is reduced, source net phase difference reduces, this mainly passes through
Phase control algorithm reduces motor generator rotor angle, therefore both end voltage phase difference also reduces.It in summary it can be seen, in active command
When variation, transmitted by the firm power that motor train may be implemented in phase control algorithm.
This embodiment is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (3)
1. a kind of for promoting the control method of new-energy grid-connected stability characterized by comprising
Step 1 provides electric energy with new energy for synchronous motor, and synchronous motor drives as prime mover of synchronous generator
Synchronous generator power generation is connected to the grid, and constitutes motor train；
Step 2, the mutual relation of electric voltage for analyzing synchronous motor and synchronous generator: since two machine rotors are coaxially connected, stable state
When operation, the built-in potential E of motor1、E2Will simultaneously, at the same speed, rotating Vortex, change U1Phase, U2To rotating Vortex therewith, U2Rotation
Angle be U1The phase of change, generator rotor angle δ1And δ2It is around U1、U2A fan-shaped distribution is presented, analysis motor train passes
Relationship between the active power that defeated new energy is issued and the parameter of electric machine calculates the function of synchronous motor and synchronous generator
Angle, the method by changing source net phase difference control the active power transfer of motor train, pass through the change of current of new energy side
Device controls U1Phase, thus effectively control synchronous motor generator rotor angle δ1, pass through U1And U2Decoupling control, and then control same
Walk the generator rotor angle δ of generator2, three-phase voltage current is measured by acquisition device, calculates power of motor, and then calculate 2 motors
Generator rotor angle adjusts modulation wave amplitude and phase by phase control algorithm, controls electronic electromechanics eventually by space vector modulation
Machine transmits active；
Step 3 establishes closed loop source net phase control method, realizes the power closed-loop control to motor train.
2. a kind of for promoting the experimental method of new-energy grid-connected stability characterized by comprising
Frequency converter, synchronous motor M, synchronous generator G, four-quadrant programmable power supply are sequentially connected to constitute motor by step 1
Train, starting subsidiary engine DM are connected with synchronous motor M, simulate new energy respectively with frequency converter and four-quadrant programmable power supply
And power grid；
Synchronous motor M is dragged to synchronous speed using starting subsidiary engine DM by step 2, and grid-connected with frequency converter, and it is auxiliary then to remove starting
Machine DM is run by transducer drive motor train；The excitation of synchronous generator G is adjusted, realizes synchronous generator G and four-quadrant
Limit the grid-connected of programmable power supply；
After step 3, stability of grid connection operation, at the uniform velocity adjusting frequency converter output voltage U1Phase, be gradually increased source net phase difference,
The single-phase active power transfer amount of motor train during this is measured, until synchronous motor M active power reaches it
Until rated value；Motor train transimission power is observed to change with source net phase difference.
3. a kind of for promoting the emulation mode of new-energy grid-connected stability characterized by comprising
Step 1 provides electric energy with new energy for synchronous motor, and synchronous motor drives as prime mover of synchronous generator
Synchronous generator power generation is connected to the grid, and establishes motor train simulation model；
Step 2, new energy side are emulated using phase-adjustable power supply, and grid side is infinitely great power supply, and synchronous motor is sent out with synchronous
Motor excitation system uses automatic magnetic exciting, to maintain motor stabilizing to run and reduce reactive power exchange as control target；
Step 3 changes phase-adjustable in system stable operation with the active transmission instruction control new energy side of synchronous generator
The active transmission instruction of power supply, the active transmission variation of observation synchronous generator, synchronous motor, motor train rotation speed change,
The variation of source net phase difference.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107393384A (en) * | 2017-08-30 | 2017-11-24 | 山东大学 | A kind of generator excitation analogue system and method |
| CN110165684B (en) * | 2019-05-08 | 2023-08-08 | 国网河南省电力公司安阳供电公司 | New energy power grid stability improving method |
| CN110504711B (en) * | 2019-08-21 | 2021-07-06 | 华北电力大学 | New energy grid-connected control system and method based on new energy synchronous machine |
| CN110829898A (en) * | 2019-11-19 | 2020-02-21 | 贵州电网有限责任公司 | Starting control method for grid connection of new energy synchronous motor |
| CN111416381A (en) * | 2020-02-28 | 2020-07-14 | 贵州电网有限责任公司 | New energy grid connection method applied to new energy power generation system |
| CN111245015A (en) * | 2020-02-29 | 2020-06-05 | 贵州电网有限责任公司 | Power feedback control system and method of MGP system |
| US12057701B2 (en) * | 2020-02-29 | 2024-08-06 | Guizhou Power Grid Company Limited | Method for MGP new energy grid-connected control |
| CN114123209B (en) * | 2020-08-28 | 2024-03-26 | 国电南瑞科技股份有限公司 | Tidal current control system and method suitable for power transmission line of power system |
| CN112271757B (en) * | 2020-11-18 | 2022-12-06 | 华北电力大学 | Method for improving operation stability of new energy synchronous motor to grid-connected system |
| CN112909953A (en) * | 2021-03-22 | 2021-06-04 | 南瑞集团有限公司 | Power flow control device, method and system |
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