CN110212567A - High voltage ac/dc serial-parallel power grid numerical simulation modeling method containing large-scale phase modifier - Google Patents
High voltage ac/dc serial-parallel power grid numerical simulation modeling method containing large-scale phase modifier Download PDFInfo
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- CN110212567A CN110212567A CN201910613522.1A CN201910613522A CN110212567A CN 110212567 A CN110212567 A CN 110212567A CN 201910613522 A CN201910613522 A CN 201910613522A CN 110212567 A CN110212567 A CN 110212567A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses the high voltage ac/dc serial-parallel power grid numerical simulation modeling methods containing large-scale phase modifier, it is related to electric system technical field of value simulation, include the following steps: step 1: by secondary transient characterisitics, transient characterisitics, the Analysis of Steady-State Performance to phase modifier, establishing the simulation model of large-scale phase modifier；Step 2: establishing four machine of high voltage ac/dc serial-parallel power grid, two simulation of domain model；Step 3: installing phase modifier model additional on high voltage ac/dc serial-parallel power grid model, establish the controller model of phase modifier, be control target with AC system voltage, quickly, smoothly adjust the output size of excitation voltage and reactive power；Step 4: by the way that high voltage ac/dc serial-parallel power grid receiving end AC system busbar short-circuit failure is arranged, the design of phase modifier controller optimization is carried out by optimization aim of AC system voltage deviation amount, help to study the characteristics such as large-scale phase modifier operation and fault characteristic, including Reactive-power control, compensation ability and response speed.
Description
Technical field
The present invention relates to electric system technical field of value simulation, in particular to the high voltage ac/dc containing large-scale phase modifier is mixed
Join power grid numerical simulation modeling method.
Background technique
With being constantly progressive for remote HVDC Transmission Technology, D.C. high voltage transmission has become the important composition of China's power grid
Part, China's power grid enter the epoch that extra-high voltage, bulk power grid, large-sized unit, alternating current-direct current interconnect.However, with extra-high voltage direct-current
Extensive access receiving end power grid, converter need to consume a large amount of reactive powers, cause receiving end power system reactive power insufficient, exchanging
When system jam, reactive power deficiency will lead to voltage and substantially fall, and cause converter valve commutation failure, to jeopardize system
Stablize.In order to realize the fast high-capacity reactive-load dynamic compensation of ultra-high voltage converter station, guarantees that system is stablized, need to install enough appearances
The reactive power compensator of amount.Compared with Static Var Compensator, static reactive generator, synchronous capacitor big, mistake with capacity
The advantages that loading capability is strong, long service life, can provide strong reactive power support to system when AC system breaks down.
However, the grid-connected practical operating experiences of large capacity phase modifier lack at present.The high pressure containing large-scale phase modifier is established to hand over
The numerical simulation model of direct current serial-parallel power grid is to study the important foundation of phase modifier operation control strategy and protection technique, to high pressure
AC-DC hybrid power grid is stable and safe operation plays a significant role.
Summary of the invention
Reactive power deficiency when the present invention is in order to solve the problems, such as system jam provides dynamic to system by phase modifier
Reactive compensation and maintain system voltage stablize, for the high voltage ac/dc serial-parallel power grid containing large-scale phase modifier there are it is non-linear, when
Denaturation and uncertainty, propose a kind of numerical simulation model modeling method of AC-DC hybrid power grid containing large-scale phase modifier.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of high voltage ac/dc serial-parallel power grid numerical simulation modeling method containing large-scale phase modifier, which is characterized in that including
Following steps:
Step 1: by secondary transient characterisitics, transient characterisitics, the Analysis of Steady-State Performance to phase modifier, establishing large-scale phase modifier
Simulation model；
Step 2: establishing four machine of high voltage ac/dc serial-parallel power grid, two simulation of domain model；
Step 3: installing phase modifier model additional on high voltage ac/dc serial-parallel power grid model, establish the controller mould of phase modifier
Type is control target with AC system voltage, quickly, smoothly adjusts the output size of excitation voltage and reactive power；
Step 4: by the way that high voltage ac/dc serial-parallel power grid receiving end AC system busbar short-circuit failure is arranged, with AC system electricity
Pressing departure is that optimization aim carries out the design of phase modifier controller optimization.
Further, the analysis of phase modifier time transient characterisitics is specifically included in the step 1:
Pass through d-axis ultra-transient reactance X "dAnalyze the secondary transient characterisitics of phase modifier；
Stator winding A phase current formula is as follows when instantaneous short-circuit:
Wherein,
In formula, α0Rotor d-axis leaves A phase winding axis phase angle, T when for short circuitaIt is normal for stator winding current die-away time
Number, T "dFor Damper Winding down slope time constant, T 'dFor excitation winding down slope time constant, I "mFor super transition short circuit
Current maxima, I 'mFor transition short circuit current maximum value, ImFor steady-state shortcircuit current maximum value；
D-axis ultra-transient reactance X "dSmaller, phase modifier stator current is bigger, and secondary transient process peak value reactive power is also got over
Greatly
Further, the analysis of phase modifier transient characterisitics is specifically included in the step 1:
The time constant T ' to be decayed by d-axis transient currentdAnalyze the transient characterisitics of phase modifier；
The time constant T ' of d-axis transient current decayingdFormula is as follows:
X in formuladDirect-axis synchronous reactance is X'dFor direct axis transient reactance, Td0For the time constant of excitation winding；
The time constant T ' of d-axis transient current decayingdSmaller, dc power and AC system voltage recovery time are fewer,
The climbing speed of phase modifier output reactive power is higher.
Further, the step 2 specifically includes: two regions are through cross, straight in two machine of high voltage ac/dc, two regional model
Interconnection parallel connection is flowed, when steady-state operation, Power operation determine in direct current transportation, and rectification side is adopted using constant current control, inverter side
With determining hold-off angle control, and it is equipped with current deviation control and current limiting low-voltage control, all generating sets are equipped with governor.
Further, the controller of phase modifier uses PID controller in the step 3, in PID controller, increases
Ratio enlargement multiple P can reduce the steady-state error of exciter control system, and integral I is put part to improve the static state of excitation system
Big multiple reduces steady-state error；Response speed of the part differential D to improve exciter control system, reduces overshoot and benefit
Repay biggish inertia time constant link in system.
Further, the exciter control system of phase modifier takes the shunt self excitation of series compensation formula in the step 3
Mode mainly includes voltage detecting, separate-blas estimation, auxiliary signal input, gain-phase compensation, silicon controlled rectifier.
Further, the step 4 specifically includes: on the receiving end AC system bus of high voltage ac/dc serial-parallel power grid
Short trouble is set, by the way that high voltage ac/dc serial-parallel power grid receiving end AC system busbar short-circuit failure is arranged, according to different type
Short trouble under caused system voltage decline degree it is different, system voltage departure is introduced and is calculated, to step 3 institute
The controller for the phase modifier stated optimizes, to meet the reactive compensation needs under different faults.
In conclusion the invention has the following advantages:
1, the high voltage ac/dc serial-parallel power grid numerical simulation modeling method of the present invention containing large-scale phase modifier is research
Large-scale phase modifier how to be given full play to and promoted to high voltage ac/dc serial-parallel power grid voltage stabilization and dynamic reactive supporting role
Basis；
2, large-scale phase modifier controller model mentioned in the present invention and parameter configuration, for research phase modifier access system without
Function voltage runs control strategy and provides foundation；
3, the high voltage ac/dc serial-parallel power grid numerical simulation modeling method of the present invention containing large-scale phase modifier, facilitates
Study the characteristics such as large-scale phase modifier operation and fault characteristic, including Reactive-power control, compensation ability and response speed.
Detailed description of the invention
A kind of overall structure diagram of the AC-DC hybrid power grid containing large-scale phase modifier in Fig. 1 present invention；
System busbar voltage oscillogram under single-phase earthing fault occurs for receiving end AC system in Fig. 2 embodiment of the present invention.
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing, and the present embodiment is not constituted to the present invention
Limitation.
The high voltage ac/dc serial-parallel power grid numerical simulation modeling method containing large-scale phase modifier that the invention discloses a kind of, including
Following steps:
Step 1: by secondary transient characterisitics, transient characterisitics, the Analysis of Steady-State Performance to phase modifier, establishing large-scale phase modifier
Simulation model；
Wherein, to the analysis of the secondary transient characterisitics of phase modifier, effect instantaneously provides strong reactive power support when showing as failure,
Help that system voltage is maintained to stablize, the parameter for influencing the secondary transient characterisitics of phase modifier is its d-axis ultra-transient reactance X "d。
Stator winding A phase current formula is as follows when instantaneous short-circuit:
Wherein,
α in formula0Rotor d-axis leaves A phase winding axis phase angle, T when for short circuitaIt is normal for stator winding current die-away time
Number, T "dFor Damper Winding down slope time constant, T 'dFor excitation winding down slope time constant, I "mFor super transition short circuit
Current maxima, I'mFor transition short circuit current maximum value, ImFor steady-state shortcircuit current maximum value.
D-axis ultra-transient reactance X "dSmaller, phase modifier stator current is bigger, and secondary transient process peak value reactive power is also got over
Greatly, when therefore establishing phase modifier model, d-axis ultra-transient reactance value cannot be arranged it is too big, when improving instantaneous short-circuit failure without
Function power.
Analysis to the transient characterisitics of phase modifier, effect show as occurring providing the idle branch of 2 times or more when catastrophe failure
Support, the parameter for influencing the secondary transient characterisitics of phase modifier is the time constant T ' of d-axis transient current decayingd。
The time constant T ' of d-axis transient current decayingdFormula is as follows:
X in formuladDirect-axis synchronous reactance is X'dFor direct axis transient reactance, Td0For the time constant of excitation winding.
In order to reduce dc power and AC system voltage recovery time, the time constant T ' of d-axis transient current decayingd
It wants as small as possible, improves the climbing speed of phase modifier output reactive power.
Step 2: establishing four machine of high voltage ac/dc serial-parallel power grid, two simulation of domain model；
Two regions are connected in parallel through AC and DC interconnection in two machine of high voltage ac/dc, two regional model, when steady-state operation, directly
Power operation is determined in stream transmission of electricity, and rectification side uses constant current control, and inverter side, which uses, determines hold-off angle control, and is equipped with current deviation
It controls (Current Error Controller, CEC) and current limiting low-voltage controls (Voltage Dependent Current
Order Limiter, VDCOL), all generating sets are equipped with governor.
Step 3: installing phase modifier model additional on high voltage ac/dc serial-parallel power grid model, establish the controller mould of phase modifier
Type is control target with AC system voltage, quickly, smoothly adjusts the output size of excitation voltage and reactive power；
Wherein the controller of phase modifier is using PID controller, in PID controller, gain KP, integration time constant
TI and derivative time constant TD adjusting is appropriate, can obtain higher control quality.Scaling up amplification factor P, which can reduce, to be encouraged
The steady-state error of magnetic control system, and booster response speed, static amplification factor of the part integral I to improve excitation system,
Reduce steady-state error, and reduce dynamic amplification factor, response speed of the part differential D to improve exciter control system reduces
Biggish inertia time constant link in overshoot and compensation system.The exciter control system of phase modifier takes series compensation
Shunt self excitation mode mainly includes voltage detecting, separate-blas estimation, auxiliary signal input, gain-phase compensation, thyristor rectifier
Device.
Step 4: by the way that high voltage ac/dc serial-parallel power grid receiving end AC system busbar short-circuit failure is arranged, with AC system electricity
Pressing departure is that optimization aim carries out the design of phase modifier controller optimization；
It specifically includes: short trouble being set on the receiving end AC system bus of high voltage ac/dc serial-parallel power grid, according to not
Caused system voltage decline degree is different under the short trouble of same type, and system voltage departure is introduced and is calculated, right
The controller of phase modifier described in step 3 optimizes, to meet the reactive compensation needs under different faults.
A kind of high voltage ac/dc serial-parallel power grid numerical simulation modeling method structure containing large-scale phase modifier of the present invention
Schematic diagram, as shown in Figure 1, including generator G1, G2, G3, G4, phase modifier SC, load L7, L9.Synchronous generator G1 is logical
Step-up transformer access node 5 is crossed, synchronous generator G2 passes through liter by step-up transformer access node 6, synchronous generator G3
Pressure transformer access node 11, synchronous generator G4 are accessed at ac bus by step-up transformer access node 10, load L7
(node 7), load L9 are accessed at ac bus (node 9), and HVDC transmission system rectification side accesses (node at ac bus
7), at HVDC transmission system inverter side access ac bus (node 9), phase modifier SC is accessed by step-up transformer and is exchanged
At bus (node 9).
The embodiment of the present invention:
Large size phase modifier involved in the present embodiment is the 300Mvar phase modifier of model TSS-300-2, design parameter such as table
Shown in 1.
1 phase modifier parameter of table
| Rated capacity | 300MVA | Rated reactive power | 300Mvar |
| Stator voltage | 20kV | Stator current | 8660A |
| Direct-axis synchronous reactance Xd | 153% | Quadrature axis synchronous reactance Xq | 148% |
| D-axis short circuit transient time-constant Td′ | 0.71s | The super transient time-constant T of d-axis short circuitd″ | 0.035s |
High voltage ac/dc serial-parallel power grid model involved in the present embodiment, that is, four machine of alternating current-direct current, two regional model, design parameter
It is as follows:
(1) generator rated capacity is 900MA, voltage rating 20KV
G1:P1=700MW, U1=1.03；G2:P2=700MW, U2=1.01
G3:G4:P4=700MW, U4=1.01
(2) step-up transformer: impedance is 0+j0.15pu under 900MA, 20/230KV benchmark, and voltage ratio is 1.0；
(3) transmission system: voltage rating 230kV, per unit value of the line parameter circuit value under 100MVA, 230kv benchmark are
R=0.0001pu/km, x=0.001pu/km, b=0.00175；
(4) load: node 7:P7=323MW, Q7=36Mvar；Node 9:P9=648MW, Q9=36Mvar；
(5) DC line:
Monopolar D. C route rated power: Pdc=200MW；DC rated voltage Udc=56kV；Rated current Idc=
3600A；
1.5 Ω of DC line resistance；Converter power transformer rated voltage ratio 230kV/23kV.
The present embodiment on the receiving end AC system bus of the high voltage ac/dc serial-parallel power grid containing large-scale phase modifier by setting
Short trouble is set, when system runs 2S, short trouble starts, and 0.1s removes failure after short trouble, obtains receiving end exchange system
Shown in voltage waveform Fig. 2 at system bus converter station.As it is clear from fig. 2 that when instantaneous short-circuit failure occurs, receiving end AC system bus
Voltage sharply declines, and the excitation system of phase modifier can not be influenced by low-voltage and carry out quick automatic field forcing at this time, output
It is a large amount of idle, it maintains busbar voltage horizontal, improves the stability of high voltage ac/dc serial-parallel power grid.
The above described is only a preferred embodiment of the present invention, being not used in the limitation present invention, those skilled in the art can
It is this to modify or equally replace within the spirit and scope of the present invention, to make various modifications or equivalent replacements to the present invention
Changing, which also should be regarded as, falls in the protection scope of technical solution of the present invention.
Claims (7)
1. a kind of high voltage ac/dc serial-parallel power grid numerical simulation modeling method containing large-scale phase modifier, which is characterized in that including such as
Lower step:
Step 1: by secondary transient characterisitics, transient characterisitics, the Analysis of Steady-State Performance to phase modifier, establishing the emulation of large-scale phase modifier
Model；
Step 2: establishing four machine of high voltage ac/dc serial-parallel power grid, two simulation of domain model；
Step 3: it installs phase modifier model additional on high voltage ac/dc serial-parallel power grid model, establishes the controller model of phase modifier, with
AC system voltage is control target, quickly, smoothly adjusts the output size of excitation voltage and reactive power；
Step 4: inclined with AC system voltage by the way that high voltage ac/dc serial-parallel power grid receiving end AC system busbar short-circuit failure is arranged
Residual quantity is that optimization aim carries out the design of phase modifier controller optimization.
2. the high voltage ac/dc serial-parallel power grid numerical simulation modeling method containing large-scale phase modifier proposed according to claim 1,
It is characterized in that,
The analysis of phase modifier time transient characterisitics is specifically included in the step 1:
Pass through d-axis ultra-transient reactance X "dAnalyze the secondary transient characterisitics of phase modifier；
Stator winding A phase current formula is as follows when instantaneous short-circuit:
Wherein,
In formula, α0Rotor d-axis leaves A phase winding axis phase angle, T when for short circuitaFor stator winding current damping time constant,
T″dFor Damper Winding down slope time constant, T 'dFor excitation winding down slope time constant, I "mFor super transition short circuit electricity
Flow maximum value, I'mFor transition short circuit current maximum value, ImFor steady-state shortcircuit current maximum value；
D is smaller by d-axis ultra-transient reactance X ", and phase modifier stator current is bigger, and secondary transient process peak value reactive power is also bigger.
3. according to claim 1 or 2 propose the high voltage ac/dc serial-parallel power grid numerical simulation modeling method containing large-scale phase modifier,
It is characterized in that,
The analysis of phase modifier transient characterisitics is specifically included in the step 1:
The time constant T ' to be decayed by d-axis transient currentdAnalyze the transient characterisitics of phase modifier；
The time constant T ' of d-axis transient current decayingdFormula is as follows:
X in formuladDirect-axis synchronous reactance is X'dFor direct axis transient reactance, Td0For the time constant of excitation winding；
The time constant T ' of d-axis transient current decayingdSmaller, dc power and AC system voltage recovery time are fewer, phase modulation
The climbing speed of machine output reactive power is higher.
4. the high voltage ac/dc serial-parallel power grid numerical simulation modeling method containing large-scale phase modifier proposed according to claim 1,
It is characterized in that,
The step 2 specifically includes: two regions connect parallel through AC and DC interconnection in two machine of high voltage ac/dc, two regional model
Connect, when steady-state operation, Power operation is determined in direct current transportation, and rectification side uses constant current control, inverter side using determining hold-off angle control,
And it is equipped with current deviation control and current limiting low-voltage control, all generating sets are equipped with governor.
5. the high voltage ac/dc serial-parallel power grid numerical simulation modeling method containing large-scale phase modifier proposed according to claim 1,
It is characterized in that,
The controller of phase modifier uses PID controller in the step 3, and in PID controller, scaling up amplification factor P can
To reduce the steady-state error of exciter control system, static amplification factor of the part integral I to improve excitation system reduces stable state
Error；Response speed of the part differential D to improve exciter control system reduces biggish used in overshoot and compensation system
Property time constant link.
6. the high voltage ac/dc serial-parallel power grid numerical simulation modeling method according to claim 5 containing large-scale phase modifier,
It is characterized in that,
The exciter control system of phase modifier takes the shunt self excitation mode of series compensation formula in the step 3, and main includes electricity
Press detection, separate-blas estimation, auxiliary signal input, gain-phase compensation, silicon controlled rectifier.
7. the high voltage ac/dc serial-parallel power grid numerical simulation modeling method according to claim 1 containing large-scale phase modifier,
It is characterized in that,
The step 4 specifically includes: short trouble is arranged on the receiving end AC system bus of high voltage ac/dc serial-parallel power grid, leads to
Setting high voltage ac/dc serial-parallel power grid receiving end AC system busbar short-circuit failure is crossed, is drawn according to different types of short trouble is lower
The system voltage decline degree risen is different, and system voltage departure is introduced and is calculated, the control to the phase modifier described in step 3
Device optimizes, to meet the reactive compensation needs under different faults.
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| CN110808591A (en) * | 2019-11-03 | 2020-02-18 | 国网湖北省电力有限公司电力科学研究院 | Excitation control parameter setting method of new-generation phase modulator considering influence of direct-current dynamic characteristics |
| CN111062176A (en) * | 2019-12-09 | 2020-04-24 | 国网山西省电力公司长治供电公司 | Low-voltage user loop impedance binary linear model construction and solving method |
| CN111209663A (en) * | 2019-12-31 | 2020-05-29 | 华中科技大学 | Modeling analysis method and system for equivalent ultra-long wave antenna array of high-voltage power grid |
| CN112688354A (en) * | 2020-12-14 | 2021-04-20 | 河海大学 | Multi-objective optimization control method for synchronous phase modulator excitation system in high-voltage direct-current transmission system |
| CN113239601A (en) * | 2021-07-13 | 2021-08-10 | 国网江西省电力有限公司电力科学研究院 | Method and device for extracting transient steady-state parameters of phase modulator in real time |
| CN113346535A (en) * | 2021-05-31 | 2021-09-03 | 河海大学 | Coordination control method and system for phase modulator reactive power regulation and direct current control system in HVDC system and storage medium |
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