CN104393609B - Static Synchronous generator failure traversing control method - Google Patents
Static Synchronous generator failure traversing control method Download PDFInfo
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- CN104393609B CN104393609B CN201410552495.9A CN201410552495A CN104393609B CN 104393609 B CN104393609 B CN 104393609B CN 201410552495 A CN201410552495 A CN 201410552495A CN 104393609 B CN104393609 B CN 104393609B
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
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Abstract
The present invention relates to a kind of Static Synchronous generator failure traversing control method, residual voltage is automatically generated by way of closed-loop control, and on H bridges each submodule of being added to, on the one hand which can ensure the equilibrium of each battery unit SOC under power network symmetric condition；On the other hand under power network asymmetry short circuit fault, it is ensured that alternate pressure and the output of three-phase symmetrical forward-order current.
Description
Technical field
Patent of the present invention is related to a kind of H bridges cascade chain type Structural Static only synchronous generator fault traversing control method.
Background technology
In recent years, with the fast development of China's economy, the demand of the energy is growing day by day, extensive new energy, distribution
Power supply, transmission system, impact/nonlinear-load largely access power system.However, the new energy with wind-powered electricity generation, photovoltaic as representative
Source, impact/nonlinear-load are accessed on a large scale, its static power producing characteristics and dynamic response characteristic and conventional synchronous generating equipment
There were significant differences, and the power supply abundance (electric load peak-valley difference increase etc.) of system and operation stability (are rung without inertia
, frequency modulation and voltage modulation etc. should be not involved in) produce large effect；Meanwhile, based under existing control mode new energy equipment it is steady
Fixed operation depends on forceful electric power net, and is limited to the actual conditions of China's new energy distribution, and power network end is in extensive new energy more,
Grid strength is weaker, influences the stable operation of new energy equipment, and then influence the stabilization of power network.In addition, distributed power source
With a large amount of accesses of DC transmission system, influence equally certain to the stabilization generation of power network, and light current distributed power source off the net
There are problems that with DC transmission system similar stable.
And Static Synchronous generator is based on the mature technologies such as high-voltage large-capacity STATCOM and battery energy storage, with advanced
Synchronous control mode be core, have both conventional synchronization generator inertia and synchronization/damping torque characteristic and voltage-regulation spy
Property, can exert oneself according to intermittent energy and load variations situation is real-time, the public grid entry point electric voltage frequency of quick regulation and amplitude, enter
And improve its dynamic characteristic, and strengthen grid entry point grid strength, it is the extensive new energy of reply, distributed power source, transmission system, punching
Hitting property/nonlinear-load largely accesses power system and causes frequency, the effective means of voltage change.
H bridges cascade chain type Structural Static stops that synchronous generator is (as shown in Figure 1) to have capacity big, is capable of achieving energy-storage battery and disperses
The features such as access, be conducive to improving battery utilization rate and service life, but its reply unbalanced power supply ability.When power network occurs
During asymmetry short circuit fault, do not simply fail to provide dynamic reactive support, cannot also ensure the alternate Pressure and Control of itself.The present invention
Patent can effectively solve the technical barrier.
At present, only ABB took the lead in have developed integrated high voltage large capacity STATCOM with battery energy storage technology in 2009
Static Synchronous generator (SSG) product, and carried out Demonstration Application in Britain Norfolk prefecture wind power plant.It is adopted on technology path
Use IGBT serial connection technologies, multiple IGBT are connected in series to after required voltage class in reapplying tri-level circuit topological structure, finally
Realize that middle high-pressure is grid-connected, as shown in Figure 2.But this topological structure proposes very high wanting to IGBT device series connection, battery process etc.
Ask, be limited to domestic device manufacture level and technique, it is difficult to realize development and utilization.
The content of the invention
Patent of the present invention is a kind of H bridges cascade chain type Structural Static only synchronous generator fault traversing control method, by note
Enter residual voltage to eliminate during line voltage generation asymmetry short circuit fault, the three-phase that negative sequence voltage is caused with positive sequence active component
Alternate unbalanced power, and then realize that dynamic reactive is supported, solve H bridges level under the conditions of asymmetry short circuit fault or unbalanced power supply
The technical barrier that connection chain structure Static Synchronous generator cannot run.
To achieve the above object, the solution of the present invention includes：
Static Synchronous generator failure traversing control method, asks for each phase each H-bridge unit DC voltage average value, warp
After 3s → 2s conversion, carry out closed-loop control respectively to α axles, beta -axis component, obtain residual voltage, and using residual voltage as dq0 →
0 axle component of abc conversion, is added on each submodule modulating wave after being converted through 2r → 3s and realizes phase under asymmetry short circuit fault
Between Pressure and Control and three-phase symmetrical forward-order current output.
Positive and negative sequence component is separated, positive sequence fundametal compoment phase is locked, the control respectively of positive-negative sequence current is realized.
The present invention automatically generates residual voltage by way of closed-loop control, and on H bridges each submodule of being added to,
On the one hand which can ensure the equilibrium of each battery unit SOC under power network symmetric condition；On the other hand it is asymmetric in power network
Under short trouble, it is ensured that alternate pressure and the output of three-phase symmetrical forward-order current.
Brief description of the drawings
Fig. 1 is H bridges cascade chain type Structural Static only synchronous generator；
Fig. 2 is ABB AB's Static Synchronous generator topology diagram；
Fig. 3 is that A phase voltages fall rear vectogram；
Fig. 4 is that B, C two-phase voltage fall rear vectogram；
Fig. 5 is H bridges cascade Static Synchronous generator overall control architecture figure；
Fig. 6 is that positive-negative sequence separates Decoupling network；
Fig. 7 is residual voltage generation scheme.
Specific embodiment
If Static Synchronous generator exports positive sequence, negative phase-sequence and residual voltage simultaneously, such as formula 1) shown in；Due to injection zero sequence electricity
Pressure, it is ensured that three-phase current is symmetrically exported, therefore only comprising positive sequence is active, positive sequence reactive component in electric current, such as formula 2) shown in.
According to Static Synchronous generator output voltage and electric current, its output in a power frequency period can be calculated average
Power is：
By formula 3) in it can be seen that three-phase mean power sum is the general power of Static Synchronous generator transmission, but each phase
Power in there is the DC quantity that negative sequence voltage and forward-order current are formed, the DC quantity will cause alternate DC voltage unbalanced.
After residual voltage is injected, by formula 3) can further obtain realizing alternate pressing, it is necessary to meet following constraint
Condition：
Further analysis understands, to three-phase unbalance system, its output phase voltage is simultaneously comprising positive sequence, negative phase-sequence, zero sequence point
Amount.After wherein a phase voltage or two-phase voltage are fallen, if its phase does not change, can be direct by graphing method
Positive sequence, negative phase-sequence and zero-sequence component size are obtained, single-phase (analytic explanation by taking A phases as an example), two-phase of falling falls (by taking B, C phase as an example
Analytic explanation) vectogram difference is as shown in Figure 3, Figure 4：
If normal grid voltage phase voltage peak value is VT, fall phase voltage peak value for n × VT(0≤n≤1), with VTAs base
Quasi- value carries out perunit, then fall the difference of mode according to line voltage single-phase, two-phase and three-phase, can respectively obtain Static Synchronous hair
Motor output voltage expression formula under line voltage asymmetry short circuit fault：
It is single-phase asymmetric to fall：
It is to Static Synchronous generator output positive sequence, negative phase-sequence, zero-sequence component amplitude：
It can thus be concluded that to single-phase imbalance fall when three-phase voltage expression formula such as formula 6) shown in：
Two-phase imbalance is fallen：
Static Synchronous generator output positive sequence, negative phase-sequence, zero-sequence component amplitude are：
It can thus be concluded that to two-phase imbalance fall when three-phase voltage expression formula such as formula 7) shown in：
Can draw to draw a conclusion by vector diagram analysis：
Fall for single-phase imbalance, Static Synchronous generator exports residual voltage with the phase voltage pair fallen
Answer direction vector anti-phase；
Fall for two-phase imbalance, Static Synchronous generator exports residual voltage with the phase voltage fallen
The correspondence same phase of direction vector.
By above-mentioned analysis, because zero sequence, negative sequence voltage components initial phase angle are identical, therefore formula 4) can be reduced to：
Vn+Vo=0 8)
I.e. when uneven or asymmetry short circuit fault occurs in line voltage, from formula 8), as long as ensureing the zero of injection
Sequence voltage is completely the same with negative sequence voltage amplitude, it is possible to realize alternate Pressure and Control, while three-phase symmetrical positive sequence can be realized
Electric current is exported.
The present invention will be further described in detail below in conjunction with the accompanying drawings.
H bridges cascade chain type Static Synchronous generator control structured flowchart as shown in figure 5, whole system by positive-negative sequence separate and
Phase lock control, power closed-loop control, residual voltage control, submodule Pressure and Control etc. are constituted.
(1) positive-negative sequence separates Decoupling network and phaselocked loop
When uneven or asymmetry short circuit fault occurs in line voltage, its voltage is simultaneously comprising positive sequence, negative phase-sequence, zero sequence point
Amount, is that this is separated firstly the need of by Decoupling network shown in Fig. 6 to positive and negative sequence component, and positive sequence base is locked on this basis
Wave component phase.
(2) H bridges cascade chain type Static Synchronous generator residual voltage control
The core control thought of residual voltage control program be ensuring that it is alternate press, in power network asymmetry short circuit fault
Under, still ensuring that three-phase symmetrical forward-order current is exported, its control block diagram is as shown in Figure 7.First, three respective direct currents of chain are calculated
Average voltage, passes it through three-phase to after two phase inversions, and residual voltage phase and amplitude are can be calculated by pi regulator
Information, the value is residual voltage；Secondly, active, reactive current and residual voltage control are exported according to Static Synchronous generator
Device output determines residual voltage phase information；The 0 axle component that finally residual voltage is converted as dq0 → abc, becomes through 2r → 3s
Be added to each submodule after changing.
Specific embodiment is presented above, but the present invention is not limited to described implementation method.Base of the invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in teaching of the invention
The model of shape, formula, parameter simultaneously need not spend creative work.It is right without departing from the principles and spirit of the present invention
Change, modification, replacement and the modification that implementation method is carried out are still fallen within protection scope of the present invention.
Claims (2)
1. Static Synchronous generator failure traversing control method, it is characterised in that ask for each phase each H-bridge unit DC voltage
Average value, after being converted through 3s → 2s, closed-loop control is carried out to α axles, beta -axis component respectively, residual voltage is obtained, according to Static Synchronous
Generator exports active, reactive current and the output of residual voltage controller determines residual voltage phase information, and by residual voltage
As the 0 axle component that 2r → 3s is converted；By Static Synchronous generator export active, reactive current component respectively with three-phase electricity piezoelectricity
The positive and negative sequence current component for flowing signal asks difference and the input that signal is converted as 2r → 3s for difference obtained after PI controls
Signal, is added on each submodule modulating wave after being converted through 2r → 3s, it is ensured that the residual voltage of injection and negative sequence voltage amplitude
It is completely the same, realize alternate Pressure and Control and the output of three-phase symmetrical forward-order current under asymmetry short circuit fault.
2. Static Synchronous generator failure traversing control method according to claim 1, it is characterised in that align, negative phase-sequence
Component is separated, and locks positive sequence fundametal compoment phase, realizes the control respectively of positive-negative sequence current.
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| CN105245115B (en) * | 2015-09-24 | 2017-12-12 | 中国人民解放军海军工程大学 | Prevent the fault-tolerant modulator approach of high voltage converter of active recharge |
| CN108599216B (en) * | 2018-05-16 | 2020-07-28 | 上海交通大学 | Chain type battery energy storage working method |
| CN110854896B (en) * | 2019-11-21 | 2020-12-15 | 中国矿业大学(北京) | MMC-HVDC control strategy for assisting fault direction judgment |
| CN112952866B (en) * | 2021-02-05 | 2023-06-13 | 艾伏新能源科技(上海)股份有限公司 | Three-phase unbalanced drop and phase mutation detection method under synchronous coordinate system |
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