CN110456198B - Soft power-on method in chain type SVG two-in-one-string test mode - Google Patents
Soft power-on method in chain type SVG two-in-one-string test mode Download PDFInfo
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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
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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
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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
- 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
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- 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
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- 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 a soft power-on method under a chain type SVG two-in-one-string test mode, which comprises the steps of putting in a soft power-on resistor, wherein each power module of each phase of SVG converter chain is in a blocking state; closing an incoming line breaker; when the direct-current voltage of the SVG converter chain of the series phase is charged to a first set value, setting each power module in the SVG converter chain of the series phase to be in an electronic bypass state, and keeping each power module in the SVG converter chain of the parallel two phases to be in a blocking state; when the direct-current voltage of the SVG converter chains of the two parallel phases reaches a rated value, setting each power module of the SVG converter chains of the two parallel phases to be in an electronic bypass state, and setting each power module of the SVG converter chains of the series phases to be in a blocking state; and when the direct-current voltage of the SVG converter chain of the series phase reaches a rated value, setting each power module of each SVG converter chain of each phase to be in a blocking state, and finishing the soft power-on process. The soft power-on process has the advantages of good effect, low cost and high reliability.
Description
Technical Field
The invention belongs to the field of electrical engineering, and particularly relates to a soft power-on method of a chained SVG in a two-in-one-serial test mode.
Background
With the rapid development of new energy power generation and extra-high voltage power transmission technologies, the demand of a power system on dynamic reactive power compensation equipment is pressing day by day. Among various reactive power devices capable of rapidly providing dynamic reactive power compensation, Static Var Generators (SVG) have attracted attention due to their fast dynamic response speed and small grid-connected harmonics.
In order to ensure that the SVG device can be successfully and stably operated at one time when arriving at a customer site, related test items are generally required to be completed as many as possible in an SVG factory test, particularly test items of the SVG at rated voltage and rated current, because sufficient test items can improve the reliability and stability of the device. However, the single-machine capacity of the SVG equipment is getting larger and larger at present, even can reach dozens of megameters or even hundreds of megameters, and often far exceeds the plant power supply capacity of the SVG enterprise (generally not exceeding several megavolt). If the performance of the whole high-capacity SVG under rated voltage and rated current is required to be examined before leaving the factory, the requirements on the capacity of a test system and a power grid are high, and in addition, the method is a huge capital investment for SVG production enterprises.
At present, SVG factory test generally carries out item test on each component of SVG, such as a current conversion chain hedging test for testing a power module monomer, a whole machine no-load test for testing the voltage control capability of a device, a semi-physical simulation test for testing a control protection system, and the like, and the whole machine full-load test which simultaneously reaches rated voltage and rated current is not usually carried out under the limit of conditions. Only a small amount of SVGs can carry out the on-load hedging test with the hedging test platform before leaving the factory, utilize condenser or reactor group or other SVGs as the reactive power equipment of accompanying and surveying, let one in the SVG of being surveyed and the reactive power equipment of accompanying and surveying send out the inductive reactive power and another send out the capacitive reactive power, two sets of equipment output reactive power complementary offset for the total reactive power of external output is approximately zero, avoids the power supply network capacity transfinite of factory. However, the method needs to configure the accompanying reactive power equipment with the capacity equivalent to that of the tested SVG in the factory, and when the SVG capacity is small, the SVG product with the small capacity or other items in the factory can be used as an accompanying reactive power device, so that the method is easy to realize; however, when the SVG capacity is hundreds of megabits, because the number of such SVG items is small, a set of device can be produced for years, and it is difficult to find a companion SVG for power hedging, and if the hedging test platform is built for the device alone, the cost of the test platform is too high, and the utilization rate is very limited.
The invention patent CN201810654389.X provides a factory full load test method of a high-capacity SVG, which is characterized in that a three-phase SVG is reconstructed into a two-in-one-series connection mode, and then reactive power hedging test is carried out on two parallel phases. The phase-splitting examination test of the SVG under rated voltage and rated current can be carried out under the condition that the external output capacity of the SVG is far smaller than the rated capacity of the SVG, additional accompanying equipment does not need to be added, the factory-leaving full-load test of the high-capacity SVG is conveniently realized under the limited factory power supply capacity, the structure of the test platform corresponding to the method is simple, the manufacturing cost is low, the SVG test method is a SVG test method, and the problem of efficient and economic full-load test of the SVG in a factory is solved. Compared with the conventional SVG, the test method has the structural characteristic that the SVG runs in a two-in-one test mode, but the analysis is based on the premise assumption that the direct-current voltage of a bridge arm basically reaches the vicinity of the rated voltage. When the device is powered on, and the direct current bus voltage of each phase bridge arm does not reach a certain value, each current conversion chain can not output the required alternating current voltage as a voltage source converter, and at the moment, the control target can not be realized necessarily. Meanwhile, the split-phase full-load test system adopts a two-in-one-string connection mode, and the voltage and current characteristics of the split-phase full-load test system are different from those of a conventional single-phase converter chain or a conventional three-phase symmetrical converter chain, so that the soft power-on process of the conventional SVG is not applicable any more; although the problem of power-on can be solved by additionally adding the software power-on hardware equipment, the additional cost problem is brought, so that the manufacturing cost of the test platform is high, and the implementation difficulty is increased.
Disclosure of Invention
The invention aims to provide a soft power-on method suitable for an SVG two-in-one-string test mode.
The soft power-on method under the two-in-one-string test mode of the chain type SVG provided by the invention comprises the following steps under the precondition that the tested SVG finishes the test mode wiring of the two-in-one-string wiring mode (figure 1):
s1, switching in a soft power-on resistor, and enabling each power module of each phase of SVG current conversion chain to be in a blocking state;
s2, closing the incoming line breaker, and thus naturally charging the three-phase current conversion chain in an uncontrolled rectification mode;
s3, when the direct-current voltage of the SVG converter chain of the series phase is charged to a first set value, sending an electronic bypass driving signal to each power module in the SVG converter chain of the series phase to enable each module to be in a bypass state, and simultaneously keeping each power module in the SVG converter chain of the parallel two phases to be in a blocking state, so that the SVG converter chain of the parallel two phases is charged by using the voltage of a power grid line;
s4, when the direct-current voltage of the SVG converter chains of the two parallel phases reaches a rated value, sending an electronic bypass driving signal to each power module of the SVG converter chains of the two parallel phases to enable each module to be in a bypass state, and simultaneously switching each power module of the SVG converter chains of the serial phases from an electronic bypass state to a blocking state, so that the SVG converter chains of the serial phases are charged by using the voltage of a power grid line;
s5, when the direct-current voltage of the SVG converter chain of the series-connected phases reaches a rated value, converting each power module of each SVG converter chain of each phase into a blocking state; at the moment, the soft power-on process under the chain type SVG two-in-one-string test mode is completed;
the electronic bypass state is defined as that 2 upper half bridges or 2 lower half bridges corresponding to each full bridge module in the SVG converter chain are simultaneously conducted;
the blocking state is defined as that IGBT signals corresponding to each full-bridge module in the SVG current conversion chain are all turned off.
The first set value is 50% of the peak value of the grid-connected point line voltage.
The soft power-on method under the two-in-one-string test mode of the chained SVG is specially designed aiming at the two-in-one-string wiring mode of the SVG, is adaptive to the voltage and current characteristics of a converter chain in the wiring mode, and can realize smooth charging of the direct current capacitor voltage of a three-phase power module to a rated value; the SVG is realized by using the self current-limiting resistor of the SVG and device drive control, a charging circuit or auxiliary hardware is not required to be additionally configured, the hardware cost is low, and the economical efficiency is good; and each module only has two states of blocking or bypassing in the charging process, and the control is simple and easy to realize.
Drawings
Fig. 1 is a schematic diagram of one-time connection of two parallel-to-one serial test modes of the chained SVG.
FIG. 2 is a schematic flow chart of the method of the present invention.
FIG. 3 is a schematic diagram of an equivalent circuit model of an SVG system in a three-phase uncontrolled rectification stage during soft power-on.
Fig. 4 is a schematic diagram of a simulation result of a soft power-on process of the method of the present invention.
Detailed Description
Before the SVG is powered on and started in a two-in-one-series test mode, the SVG completes assembly of internal components such as a current conversion chain, a filter reactance, a soft start circuit, a control system and the like; and then, according to a primary wiring diagram corresponding to the two-in-one-string test mode shown in fig. 1, external port connection is performed, for example, an AB phase port is connected in parallel to an a phase port corresponding to a rated line voltage of a power grid, and a C phase port is connected to a C phase port of the power grid, and the connection mode forms that the AB two phases are connected in parallel and the C phases are connected in series in the SVG.
Fig. 2 is a schematic diagram of the program flow of the method of the present invention, and the system status between soft power-on is: the three-phase incoming line breaker is disconnected, the soft power-on relay is disconnected, each chain link of the converter chain drives and controls a power supply to be electroless, each power module switching tube is disconnected, the upper control system supplies power normally, each component monomer is tested to be qualified, and the external connection of each component is normal;
then, the soft power-on process is carried out according to the following steps:
s1, switching in a soft power-on resistor, and enabling each power module of each phase of SVG current conversion chain to be in a blocking state;
in specific implementation, firstly, the opening state of a three-phase incoming line breaker is kept, parallel relays of three-phase soft power-on resistors are kept at the opening position, and meanwhile, a driving locking signal is sent to any one module;
s2, closing the incoming line breaker, and thus naturally charging the three-phase current conversion chain in an uncontrolled rectification mode;
during specific implementation, the three-phase incoming line breaker is closed, meanwhile, the locking state of each converter chain power module is still kept, at the moment, a power grid voltage source, a soft upper resistor, a connecting reactor, an anti-parallel diode, a chain link direct current capacitor and the like are arranged in each module of a converter chain to form a current loop, the three-phase power module carries out uncontrolled rectification charging, the soft upper resistor limits starting impact current, and the direct current bus voltage of each module stably rises. Because the current of the C-phase converter chain is equal to the sum of the two phases AB connected in parallel, the charging rate of the C-phase direct-current voltage is about twice of that of the A-phase or the B-phase direct-current voltage because the internal parameters of the SVG three-phase converter chain are generally symmetrical. In this stage, since the two phases AB are connected in parallel and have the same state, the phase C current is the sum of the phase a and the phase B current, and the SVG system equivalent circuit is shown in fig. 3. According to kirchhoff's voltage law, the voltage equation at this time can be expressed as:
because the three-phase current conversion chain works in an uncontrolled rectification mode, and the phase C current is equal to the sum of the phase AB currents. The charging rate of the C-phase dc voltage is about twice that of the a-phase or B-phase dc voltage, and the C-phase converter chain dc voltage is 2 times that of the a-phase or B-phase dc voltage at any time during this phase. Namely, it is
udc_C＝2udc_A
When the uncontrolled rectifying mode reaches steady state, the charging current is approximately equal to 0. At this point it is possible to obtain:
Upeak g _ ac＝Udc _ a steady state+Udc _ C steady state
2/3, which theoretically could rise to the peak of the grid line voltage;
s3, when the direct-current voltage of the SVG converter chains of the series-connected phases is charged to a first set value (for example, 50% of the peak value of the line voltage of the grid-connected point), enabling each power module in the SVG converter chains of the series-connected phases to be in an electronic bypass state, and simultaneously keeping each power module in the SVG converter chains of the parallel-connected two phases to be in a blocking state, so that the SVG converter chains of the parallel-connected two phases are charged by using the line voltage of the grid;
in specific implementation, when the dc bus voltage of the C-phase converter chain reaches a set threshold (the threshold may be 50% -60% of the peak value of the grid line voltage to ensure that the minimum input voltage of the power supply unit of each power module of the converter chain is exceeded, the power supply of each power module of the phase can work normally, and the IGBT can drive normally), the generator bypass signal (that is, 2 upper half bridges of each full-bridge module are conducted simultaneously or 2 lower half bridges of each full-bridge module are conducted simultaneously) of each power module of the C-phase converter chain forces the output voltage of the C-phase converter chain to be zero; at the moment, a power grid voltage source, a three-phase soft power-on resistor, a three-phase connection reactor, an AB two-phase current conversion chain module with an anti-parallel diode, an AB two-phase chain link direct current capacitor and the like form a current loop, and the AB two phases are subjected to uncontrolled rectification charging; at the moment, the C-phase converter chain direct-current bus capacitor is disconnected with the current loop, and the direct-current bus voltage is basically kept unchanged; the DC voltage of the two phases AB is gradually increased, and theoretically the highest DC voltage can be increased to the peak value of the voltage of the power grid line; however, because the rated direct-current voltage of each phase converter chain is generally near the effective value of the voltage of the power grid line, in order to avoid overcharging, the next step can be switched to when the direct-current voltage of the AB two-phase converter chain reaches the rated value;
s4, when the direct-current voltage of the SVG converter chains of the two parallel phases reaches a rated value, enabling each power module of the SVG converter chains of the two parallel phases to be in an electronic bypass state, and simultaneously switching each power module of the SVG converter chains of the serial phases from the electronic bypass state to a blocking state, so that the SVG converter chains of the serial phases are charged by using the voltage of a power grid line;
in specific implementation, when the DC voltage of the parallel AB two-phase converter chain reaches a rated value, the C-phase converter chain is driven to be switched from an electronic bypass state to a blocking state, and then an electronic bypass signal is generated on the AB two-phase converter chain, at the moment, a power grid voltage source, a three-phase soft-up resistor, a three-phase connecting reactance, a self-contained anti-parallel diode, a C-phase chain link DC capacitor and the like in each module of the C two-phase converter chain form a current loop, and the C-phase converter chain is charged in an uncontrolled rectifier type by using the voltage of a power grid line; at the moment, the AB phase converter chain direct current bus capacitor is disconnected with the current loop, and the direct current bus voltage is basically kept unchanged; the DC voltage of the C two phases gradually rises, and theoretically the highest DC voltage can rise to the peak value of the voltage of the power grid line; however, because the rated direct-current voltage of each phase converter chain is generally near the effective value of the voltage of the power grid line, in order to avoid overcharging, the next step can be switched to when the direct-current voltage of the C phase converter chain reaches the rated value;
s5, when the direct-current voltage of the SVG converter chain of the series-connected phases reaches a rated value, converting each power module of each SVG converter chain of each phase into a blocking state; at the moment, the soft power-on process under the chain type SVG two-in-one-string test mode is completed;
in specific implementation, when the direct-current voltage of the C-phase converter chain also reaches the rated value, and the direct-current voltages of the three converter chains reach the vicinity of the rated value, the blocking signals are sent to the drives of the 3-phase converter chains; at the moment, in a loop formed by the A-phase loop and the C-phase loop, because the sum of AC two-phase direct current voltage exceeds the voltage of a power grid line, current cannot be generated under the action of single-phase conduction characteristics of a diode in a converter chain; at the moment, charging is finished, and the SVG enters a standby state;
the electronic bypass state is defined as that 2 upper half bridges or 2 lower half bridges of each full bridge module of each power module of the SVG converter chain are simultaneously conducted;
the blocking state is defined as that the IGBT signal of each full-bridge module of each power module of the SVG converter chain is turned off.
Meanwhile, the C-phase dc voltage charging setting threshold (first setting) can theoretically take any value of 50% -66% of the peak value of the grid-connected point line voltage. But preferably 50% of the peak value of the grid-connected point line voltage, so that the driving power supply of each power module of the phase current chain can be ensured to normally work, and the phase power module can reliably realize electronic bypass; meanwhile, the charging operation time can be prevented from being too long.
In addition, in the logic for judging whether the direct current voltage reaches the set threshold value in the steps, a hysteresis comparison link can be set, so that the phenomenon that the jitter occurs among the steps due to the slight fluctuation of the direct current voltage is avoided: for example, the threshold value is set for the C-phase dc voltage charge in the third step, the C-phase electronic bypass is forced after the C-phase dc voltage exceeds 50% of the peak value of the grid-connected point line voltage, the C-phase electronic bypass state is closed when the C-phase dc voltage is lower than 48% of the peak value of the grid-connected point line voltage, and the current state is kept unchanged when the C-phase dc voltage is between 48% and 50% of the peak value of the grid-connected point line voltage. Similarly, other threshold comparison logics perform similar processing.
According to the method, the SVG soft power-on process is simulated, the obtained result is shown in fig. 4, the change rule of each phase voltage and current in different stages can be seen, the three-phase current impact is small, and the three-phase voltage can stably reach the rated value.
Claims (2)
1. A soft power-on method of a chain type SVG under a two-in-one-string test mode comprises the following steps:
s1, switching in a soft power-on resistor, and enabling each power module of each phase of SVG converter chain to be in a blocking state;
s2, closing the incoming line breaker, and naturally charging the three-phase commutation chain in an uncontrolled rectification mode;
s3, when the direct-current voltage of the SVG converter chain of the series phase is charged to a first set value, enabling each power module in the SVG converter chain of the series phase to be in an electronic bypass state, and simultaneously keeping each power module in the SVG converter chain of the parallel two phases to be in a blocking state, so that the SVG converter chain of the parallel two phases is charged by using the voltage of a power grid line;
s4, when the direct-current voltage of the SVG converter chains of the two parallel phases reaches a rated value, enabling each power module of the SVG converter chains of the two parallel phases to be in an electronic bypass state, and simultaneously switching each power module of the SVG converter chains of the serial phases from the electronic bypass state to a blocking state, so that the SVG converter chains of the serial phases are charged by using the voltage of a power grid line;
s5, when the direct-current voltage of the SVG converter chain of the series-connected phase reaches a rated value, each power module of each SVG converter chain of each phase is converted into a blocking state; at the moment, the soft power-on process under the chain type SVG two-in-one-string test mode is completed;
the electronic bypass state is defined as that 2 upper half bridges or 2 lower half bridges corresponding to the full bridge module in the SVG current conversion chain are simultaneously conducted;
the blocking state is defined as that all IGBT signals of the corresponding full-bridge module in the SVG current conversion chain are turned off;
the two chain type SVG are connected in series, specifically, AB phase ports are connected in parallel and then connected to A phase ports corresponding to rated line voltage of a power grid, C phase ports are connected to C phase ports of the power grid, and the wiring mode forms AB two phases which are connected in parallel and C phases which are connected in series in the SVG.
2. The soft power-on method in chained SVG two-in-one-string test mode as claimed in claim 1, wherein said first setting is 50% of the peak value of the line voltage of the point-of-connection.
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