CN110456198A - Soft powering method under chain type SVG two and a string of test patterns - Google Patents
Soft powering method under chain type SVG two and a string of test patterns Download PDFInfo
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- CN110456198A CN110456198A CN201910749504.6A CN201910749504A CN110456198A CN 110456198 A CN110456198 A CN 110456198A CN 201910749504 A CN201910749504 A CN 201910749504A CN 110456198 A CN110456198 A CN 110456198A
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- svg
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Classifications
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive 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
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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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]
Abstract
The invention discloses the soft powering methods under a kind of chain type SVG two and a string of test patterns, are blocked styate including putting into the soft each power module for powering on resistance and each phase SVG converting link；Combined floodgate incoming breaker；Each power module when the DC voltage of the SVG converting link for phase of connecting charges to the first setting value in the SVG converting link of setting series connection phase is electronic bypass state, and keeping each power module in the SVG converting link of two-phase in parallel is blocked styate；Each power module that the SVG converting link of two-phase in parallel is arranged when the DC voltage of the SVG converting link of two-phase in parallel reaches rated value is electronic bypass state, and sets blocked styate for each power module of the SVG converting link for phase of connecting；Each power module that each phase SVG converting link is arranged when the DC voltage of the SVG converting link for phase of connecting reaches rated value is blocked styate, and soft power up is completed.Soft power up effect of the invention is preferable, low in cost, high reliablity.
Description
Technical field
The invention belongs to electrical engineering fields, and in particular to soft under a kind of chain type SVG two and a string of test patterns powers on
Method.
Background technique
With generation of electricity by new energy and the fast development of UHV transmission technology, electric system is to dynamic passive compensation equipment
Demand is increasingly urgent.In there are all kinds of reactive apparatus for quickly providing dynamic passive compensation ability, static synchronous generator
(Static Var Generator, SVG) because with rapid dynamic response speed, grid-connected harmonic wave is small due to receive significant attention.
In order to can once put into operation successfully and stable operation when guaranteeing that SVG equipment reaches curstomer's site, usually requires that and go out in SVG
Dependence test project, especially SVG are as often as possible completed in voltage rating, the pilot project of rated current in factory's test, because
Sufficient pilot project can be improved the reliability and stability of equipment.But current SVG equipment single-machine capacity is increasing, even
Up to tens of megavars even megavars up to a hundred, usually (are usually no more than several megavolts considerably beyond plant area's power supply capacity of SVG enterprise
Peace).If wanting to carry out overall performance examination of the large capacity SVG under voltage rating, rated current before factory, to pilot system and
Electrical network capacity requirement is all very high, is also in addition a very large capital investment to SVG manufacturing enterprise.
Currently, SVG factory test is usually to carry out item-dividing test, such as testing power module monomer to SVG each component
Converting link liquidate test, the complete machine no-load test of test device voltage control capability, testing and control protection system it is half in kind imitative
True test etc., by condition limit usually without and meanwhile reach the complete machine full-load test of voltage rating and rated current.It is only few
Amount SVG can carry out band with the test platform that liquidates before factory and carry the test that liquidates, and be made using capacitor or reactor group or other SVG
To accompany survey reactive apparatus, allows and tested SVG and accompanies and survey a hair inductive reactive power in both reactive apparatus and another sends out capacitive reactive power,
Two sets of equipment output reactive complementations are offset, so that it is approximately zero that externally output is always idle, plant area's supply network capacity are avoided to transfinite.
But this method need to be configured in plant area and tested SVG capacity is comparable accompanies survey reactive apparatus, when SVG capacity is smaller, surveys because accompanying
Place capacity is smaller or factory in often there is the SVG product of sundry item is available to be invited to be present at a banquet given in honour of a distinguished guest survey Reactive Power Device, be still easily achieved；If but working as
When SVG capacity is up to hundred megavars, since such SVG number of items is inherently less, the possible several years can just produce set of device, it is difficult to
Finding one again accompanies survey SVG to liquidate to carry out power, if the independent aforementioned test platform that liquidates of plant construction thus, test platform
Cost is too high and utilization rate is also very limited.
Patent of invention CN201810654389.X proposes the factory full load test method of large capacity SVG a kind of, feature
It is three-phase SVG to be reconstructed into the mode of connection of two and a string, then the idle power examination that liquidates is carried out to two-phase in parallel.It can be in SVG
External output capacity examines survey much smaller than split-phase of the SVG under voltage rating and rated current is carried out under conditions of its rated capacity
Examination, and do not need additionally to increase and accompany measurement equipment, convenient for realizing that the factory to large capacity SVG is fully loaded under limited plant area's power supply capacity
Test, the structure that this method correspond to test platform is simple, low cost, is a kind of SVG test method, solves SVG height in factory
Effect, economic full load test problem.Relative to conventional SVG, the structure feature of the test method is that SVG operates in two and a string
Test pattern, but its analysis is all based on bridge arm DC voltage and all basically reaches hypotheses near its voltage rating.It is filling
It sets stage when powering on, when certain numerical value has not yet been reached in the DC bus-bar voltage of each phase bridge arm, as voltage source converter, each change of current
Chain can not export required alternating voltage, and aforementioned control target necessarily cannot achieve at this time.Simultaneously because split-phase full load test system
System uses the mode of connection of two and a string, and voltage and current feature is totally different in conventional single-phase converting link or the three-phase symmetrical change of current
Chain causes the soft power up of conventional SVG to be no longer applicable in；Although and additionally increasing the soft hardware device that powers on can also solve to power on to ask
Topic, but additional cost problem can be brought, lead to test platform cost height, increase and realize difficulty.
Summary of the invention
It is an object of that present invention to provide a kind of soft powering methods suitable under SVG two and a string of test patterns.
Soft powering method under this chain type SVG two provided by the invention and a string of test patterns, it is complete in tested SVG
At two and a string of modes of connection test pattern wiring precondition under (Fig. 1), include the following steps:
S1. put into it is soft power on resistance, and make each phase SVG converting link each power module be blocked styate；
S2. it closes a floodgate incoming breaker, to carry out the natural charging under uncontrollable rectifier mode to three-phase converting link；
S3. when the DC voltage of the SVG converting link for phase of connecting charges to the first setting value, series connection phase SVG converting link is given
In each power module send electronic bypass driving signal aforementioned each module made to be in bypass condition, while keeping two-phase in parallel
Each power module in SVG converting link is blocked styate, to be carried out using SVG converting link of the grid line voltage to two-phase in parallel
Charging；
S4. when the DC voltage of the SVG converting link of two-phase in parallel reaches rated value, to the SVG converting link of two-phase in parallel
Each power module send electronic bypass driving signal aforementioned each module made to be in bypass condition, while by the SVG for phase of connecting
Each power module of converting link is switched to blocked styate from electronic bypass state, thus using grid line voltage to series connection phase
SVG converting link charges；
S5. when the DC voltage of the SVG converting link for phase of connecting reaches rated value, by each power of each phase SVG converting link
Module is converted to blocked styate；The soft power up under chain type SVG two and a string of test patterns is completed at this time；
The definition of the electronic bypass state goes up half-bridges simultaneously to correspond to 2 of each full-bridge modules in SVG converting link
Conducting or 2 lower half-bridges simultaneously turn on；
The definition of the blocked styate is turned off to correspond to the IGBT signal of each full-bridge modules in SVG converting link.
First setting value is the 50% of grid entry point line voltage peak value.
Soft powering method under this chain type SVG two provided by the invention and a string of test patterns, for SVG two and a string
Converting link voltage and current feature under mode of connection special designing, with the mode of connection is adapted, it can be achieved that by three phase power mould
Block DC capacitor voltage smoothly charges to rated value；It is realized using SVG itself current-limiting resistance and device drive control, is not required to volume
Outer configuration charging circuit or ancillary hardware, hardware cost is low, good economy performance；And each module only block or other in charging process
Road two states, control are simple, it is easy to accomplish.
Detailed description of the invention
Fig. 1 is the primary connection schematic diagram of chain type SVG two and a string of test patterns.
Fig. 2 is the method flow schematic diagram of the method for the present invention.
Fig. 3 is the method for the present invention in the soft SVG system equivalent-circuit model signal for powering on three-phase uncontrollable rectifier stage period
Figure.
Fig. 4 is the soft power up simulation result schematic diagram of the method for the present invention.
Specific embodiment
Before SVG two and a string of test pattern electrifying startups, SVG be completed converting link, filter reactance, soft starting circuit,
The assembling of the internal components such as control system；Then according still further to shown in FIG. 1 two and a string of test patterns correspond to primary connection figure progress
Outside port connection, such as the port parallel connection of AB phase are followed by power grid rated line voltage corresponding A phase port, and C phase port is connected to electricity
C phase port is netted, AB two is in parallel in mode of connection composition SVG and C is connected in series.
Be illustrated in figure 2 the program circuit schematic diagram of the method for the present invention, the system mode between soft power on are as follows: three-phase into
Line breaker disconnects, soft upper electrical relay disconnects, each chain link driving of converting link and control power supply are without electricity, each power module switching tube
It disconnects, top level control system power supply is normal, each component monomer assays are qualified, each component outer connection is normal；
Then, soft power up is carried out in accordance with the following steps:
S1. put into it is soft power on resistance, and make each phase SVG converting link each power module be blocked styate；
In the specific implementation, three-phase incoming breaker gate-dividing state is kept first, keeps the soft parallel connection for powering on resistance of three-phase
Relay is in open position, while all sending out any one module driving block signal, because power module controls electricity in chain link
When source is lower than minimum operating voltage or without driving unlocking signal, each module drive all automatically keeps IGBT shutdown, therefore to module
Hair driving block signal can keep each switching device to disconnect；
S2. it closes a floodgate incoming breaker, to carry out the natural charging under uncontrollable rectifier mode to three-phase converting link；
In the specific implementation, three-phase incoming breaker is closed, while still maintaining each converting link power module blocking,
At this time network voltage source, soft power on resistance, connection reactance, carry anti-paralleled diode, chain link direct current in each module of converting link
Appearance etc. constitutes current loop, and three phase power module carries out uncontrollable rectifier charging, wherein soft power on resistance limitation inrush current,
Each module DC bus-bar voltage steadily rises.Since the electric current of wherein C phase converting link is equal to the sum of parallel connection AB two-phase, because of SVG tri-
Phase converting link inner parameter is generally symmetrical, and C phase DC voltage charge rate is about twice of A phase or B phase.In this stage, by
It is in parallel in AB two and state is identical, C phase current is the sum of A phase and B phase current, at this time SVG system equivalent circuit such as Fig. 3 institute
Show.According to Kirchhoff's second law, voltage equation be may be expressed as: at this time
Three characteristics of the middle term converting link all works in uncontrollable rectifier mode, and C phase current is equal to the sum of AB biphase current.So C phase
DC voltage charge rate is about twice of A phase or B phase, and any time of C phase converting link DC voltage in this stage is A
2 times of phase or B phase DC voltage.I.e.
udc_C=2udc_A
When uncontrollable rectifier mode reaches stable state, charging current is approximately equal to 0.It is available at this time:
UG_ac peak value=UDc_A stable state+UDc_C stable state
I.e. theoretically its highest can rise to the 2/3 of grid line voltage peak value；
S3. the first setting value (such as grid entry point line voltage peak value is charged in the DC voltage of the SVG converting link of series connection phase
50%) when so that each power module in the SVG converting link of series connection phase is electronic bypass state, while keeping two-phase in parallel
SVG converting link in each power module be blocked styate, thus using grid line voltage to the SVG converting link of two-phase in parallel into
Row charging；
In the specific implementation, when the above-mentioned threshold values to setting of C phase converting link DC bus-bar voltage, (threshold values can be taken as grid line
The 50%-60% of voltage peak, to ensure the minimum input voltage of power supply unit more than each power module of converting link, the phase at this time
Each power module power supply can work normally, and IGBT can normal driving), it is other to each power module of C phase converting link son that generates electricity
Road signal (i.e. each full-bridge modules 2 upper half-bridges simultaneously turn on or 2 lower half-bridges simultaneously turn on) forces C phase converting link output electricity
Pressure is zero；At this time network voltage source, three-phase it is soft power on resistance, three be connected reactance, carry in each module of AB two-phase converting link it is anti-
Parallel diode, AB phase chain link DC capacitor etc. constitute current loop, carry out uncontrollable rectifier charging to AB two-phase；C phase is changed at this time
It flows chain dc-link capacitance and current loop disconnects, DC bus-bar voltage is held essentially constant；And AB two-phase DC voltage by
Edge up height, and theoretically its highest can rise to grid line voltage peak value；But because each phase converting link rated direct voltage is generally electricity
Near cable voltage effective value, to avoid overcharge, it can be switched to when AB two-phase converting link DC voltage reaches its rated value
Next step；
S4. when the DC voltage of the SVG converting link of two-phase in parallel reaches rated value, so that the SVG change of current of two-phase in parallel
Each power module of chain is electronic bypass state, while by each power module of the SVG converting link for phase of connecting from electronic bypass shape
State is switched to blocked styate, to be charged using SVG converting link of the grid line voltage to series connection phase；
In the specific implementation, when AB two-phase converting link DC voltage in parallel reaches its rated value, first C phase converting link is driven
It is dynamic to be switched to blocked styate from electronic bypass state, then generate electricity sub- by-passing signal to AB two-phase converting link, at this time network voltage source,
Three-phase is soft power on resistance, three be connected reactance, carry anti-paralleled diode, C phase chain link direct current in each module of C two-phase converting link
Appearance etc. constitutes current loop, carries out uncontrollable rectifier type charging with converting link of the grid line voltage to C phase；AB phase converting link is straight at this time
It flows bus capacitor and current loop disconnects, DC bus-bar voltage is held essentially constant；And C two-phase DC voltage gradually rises,
Theoretically its highest can rise to grid line voltage peak value；But because each phase converting link rated direct voltage is generally grid line voltage
Near virtual value, to avoid overcharge, next step can be switched to when C phase converting link DC voltage reaches its rated value；
S5. when the DC voltage of the SVG converting link for phase of connecting reaches rated value, by each power of each phase SVG converting link
Module is converted to blocked styate；The soft power up under chain type SVG two and a string of test patterns is completed at this time；
In the specific implementation, when C phase converting link DC voltage also reaches its rated value, the direct current of three converting links at this time
When voltage is all reached near its rated value, then locking signal is all sent out to the driving of 3 phase converting links；It is returned at this time in A phase circuit+C phase
In the circuit that road is constituted, since the sum of AC two-phase DC voltage is more than grid line voltage, lead converting link internal diode is single-phase
Under logical characteristic effect, electric current will not be generated；Charging complete at this time, SVG enter standby mode；
The definition of the electronic bypass state is on 2 of each full-bridge modules of each power module of SVG converting link
Half-bridge simultaneously turns on or 2 lower half-bridges simultaneously turn on；
The definition of the blocked styate is that the IGBT signal of each full-bridge modules of each power module of SVG converting link is equal
Shutdown.
Meanwhile C phase DC voltage charging setting threshold values (the first setting value) can theoretically take grid entry point line voltage peak value
Arbitrary value in 50%-66%.But it preferably can be taken as the 50% of grid entry point line voltage peak value, can both guarantee that this was mutually changed in this way
The driving power for flowing each power module of chain works normally, it is sufficient to which the phase power module can be reliably achieved electronic bypass；Simultaneously
It can avoid charging operations overlong time again.
In addition, whether DC voltage reaches in the decision logic of setting threshold values in abovementioned steps, stagnant ring ratio can be set
Compared with link, to avoid causing to shake between each step because of DC voltage Slight undulations: such as to the C phase direct current in third step
Voltage charging setting threshold values, it is settable to be forced by C phase electronics after C phase DC voltage is more than the 50% of grid entry point line voltage peak value
Road closes C phase electronic bypass state when C phase DC voltage is lower than the 48% of grid entry point line voltage peak value, when C phase DC voltage
It is kept the current status unchanged when between grid entry point line voltage peak value 48%-50%.Similarly other threshold values CL Compare Logics all do class
Like processing.
According to the above method, a soft power up of SVG is emulated, acquired results are as shown in figure 4, can therefrom see
To each phase voltage curent change rule of different phase, three-phase current, which impacts smaller and three-phase voltage, smoothly to reach specified
Value.
Claims (2)
1. the soft powering method under a kind of chain type SVG two and a string of test patterns, includes the following steps:
S1. put into it is soft power on resistance, and make each phase SVG converting link each power module be blocked styate；
S2. it closes a floodgate incoming breaker, to carry out the natural charging under uncontrollable rectifier mode to three-phase converting link；
S3. when the DC voltage of the SVG converting link for phase of connecting charges to the first setting value, so that the SVG converting link of series connection phase
In each power module be electronic bypass state, while keeping each power module in the SVG converting link of two-phase in parallel for block
State, to be charged using SVG converting link of the grid line voltage to two-phase in parallel；
S4. when the DC voltage of the SVG converting link of two-phase in parallel reaches rated value, so that the SVG converting link of two-phase in parallel
Each power module is electronic bypass state, while each power module of the SVG converting link for phase of connecting being cut from electronic bypass state
Blocked styate is changed to, to charge using SVG converting link of the grid line voltage to series connection phase；
S5. when the DC voltage of the SVG converting link for phase of connecting reaches rated value, by each power module of each phase SVG converting link
Be converted to blocked styate；The soft power up under chain type SVG two and a string of test patterns is completed at this time；
The definition of the electronic bypass state is correspond to 2 of full-bridge modules in SVG converting link and goes up half-bridges to simultaneously turn on or 2
Lower half-bridge simultaneously turns on；
The definition of the blocked styate is turned off to correspond to the IGBT signal of full-bridge modules in SVG converting link.
2. the soft powering method under chain type SVG two according to claim 1 and a string of test patterns, it is characterised in that described
The first setting value be grid entry point line voltage peak value 50%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116381394A (en) * | 2023-06-05 | 2023-07-04 | 北京市轨道交通运营管理有限公司 | Static power converter valve group level power hedging test platform and test method |
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