CN112630640A - DC circuit breaker synthesis test loop and method of two-level voltage source - Google Patents
DC circuit breaker synthesis test loop and method of two-level voltage source 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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
Abstract
The invention provides a two-level voltage source direct current breaker synthesis test loop and a method, comprising a current source and two-level voltage sources, wherein the current source and the two-level voltage sources are connected to two ends of a test sample direct current breaker in parallel; according to the invention, the two-level voltage source is used for equivalent transient on-off voltage, so that enough transient on-off voltage and duration time can be ensured during the test, the direct-current system voltage which needs to be borne after the direct-current circuit breaker is switched on and off can be provided, and the test loop is simple and has high equivalence; the current source and the two-level voltage source are matched with each other to be capable of equivalent current and voltage stress which are more consistent with the actual on-off of the direct-current circuit breaker, so that the on-off performance of the direct-current circuit breaker is reliably verified, and the test loop is small in capacity, simple in structure and high in economical efficiency.
Description
Technical Field
The invention belongs to the field of direct current breaker tests, and particularly relates to a direct current breaker synthesis test loop with two level voltage sources and a method.
Background
With the rapid increase of the installed scale of renewable clean energy sources such as wind energy, solar energy and the like, a multi-terminal direct current power transmission and distribution technology suitable for the large-scale access of intermittent renewable energy sources is widely regarded. The direct current breaker is used as important protection equipment in a direct current system, and can quickly clear and isolate faults so as to guarantee the safety and the stability of the direct current system. In order to ensure that the direct current circuit breaker can be reliably opened, the opening test of the direct current circuit breaker plays an important role in verifying the performance of the direct current circuit breaker.
The direct-current circuit breaker mainly used in the direct-current power grid comprises a hybrid direct-current circuit breaker and a mechanical direct-current circuit breaker, although the working principles of the hybrid direct-current circuit breaker and the mechanical direct-current circuit breaker are different, the hybrid direct-current circuit breaker and the mechanical direct-current circuit breaker are generally formed by connecting a main branch for long-term through-flow, a current conversion branch for current transfer and an energy dissipation branch in parallel, and the direct-current circuit breaker and the energy dissipation branch are required to be switched on and off by transferring. The switching-on and switching-off process of the direct current circuit breaker can be qualitatively described by the aid of fig. 1, after a fault occurs, the main circuit breaker of the main branch circuit is switched off after receiving a switching-off instruction, fault current is transferred from the main branch circuit to the current conversion branch circuit by injecting reverse current or closing a power electronic switch of the main branch circuit, and voltage of the current conversion branch circuit rises rapidly; when the voltage of the current conversion branch circuit reaches the action voltage of the arrester of the energy dissipation branch circuit, the arrester acts, and the fault current is transferred from the current conversion branch circuit to the energy dissipation branch circuit; the energy dissipation branch dissipates system energy to enable the current to be gradually reduced, and the transient on-off voltage of the direct current breaker is maintained near the residual voltage of the lightning arrester at the stage; when the fault current is reduced to the residual current level, the direct current circuit breaker bears the voltage of the direct current system, and finally the residual current switch cuts off the residual current to isolate the direct current circuit breaker from the direct current system.
The breaking test of the DC circuit breaker requires equivalenceCurrent and voltage stresses in the actual breaking situation, the maximum fault current and the current rise rate during the fault current rise should be satisfied for the current stress, and the transient breaking voltage rise rate during the voltage rise, the transient breaking voltage duration (equivalent to t) should be satisfied for the voltage stressFS) DC system voltage Udc。
As can be seen from the above-mentioned switching process, the surge arrester of the dc circuit breaker provides a transient switching voltage when dissipating energy. If the lightning arrester with the direct current circuit breaker is tested during testing, the application of voltage stress can become difficult, for example, the lightning arrester needs to dissipate more than 100MJ energy when the 535kV direct current circuit breaker is switched on and switched off, the requirement on a testing power supply is too high, a testing loop is difficult to realize, a small-capacity testing loop can cause too short duration of transient switching-off voltage due to insufficient energy provided, and the equivalence of the tested voltage stress is insufficient. In order to solve the contradiction, the method adopts a method of removing the lightning arrester to carry out the on-off test, in the situation, how to equivalently obtain the current and voltage stress under the actual on-off situation of the direct current circuit breaker is the key, the amplitude and the duration of the transient on-off voltage provided when the lightning arrester absorbs energy and the direct current system voltage endured by the direct current circuit breaker after the action of the lightning arrester are all required to be equivalently applied to a test article by a test loop, the design difficulty of the test loop is large, and a mature design scheme related to the test loop is not provided.
Disclosure of Invention
In order to solve the problems, the invention provides a two-level voltage source direct current breaker synthesis test loop and a method thereof, and aims to use a current source and a two-level voltage source to achieve current and voltage stress which are more consistent with the actual on-off of a direct current breaker, reduce the cost of the test loop, and ensure that transient recovery voltage, the duration time of the transient recovery voltage and the voltage of a direct current system are consistent with the actual on-off, so that the on-off performance of the direct current breaker is reliably verified.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a two-level voltage source direct current breaker synthesis test loop which comprises a current source and two-level voltage sources, wherein the current source and the two-level voltage sources are connected to two ends of a test sample direct current breaker in parallel.
Preferably, the current source comprises a current source LC branch, a voltage limiting branch, an arc striking branch and an auxiliary switch, wherein one end of the current source LC branch connected with the voltage limiting branch in parallel is sequentially connected with the arc striking branch and the auxiliary switch in series, and the other end of the auxiliary switch is connected with one end of the sample direct current circuit breaker; the other end of the current source LC branch circuit is grounded after being connected with the voltage limiting branch circuit in parallel.
Preferably, the current source LC branch includes a capacitor Ci, an inductor Li, and a closing switch S1, wherein one end of the capacitor Ci is sequentially connected in series with the inductor Li and the closing switch S1; the other end of the capacitor Ci is connected with one end of the voltage limiting branch in parallel and then grounded; and the free end of the closing switch S1 is connected in parallel with the other end of the voltage limiting branch and then connected in series with the arc striking branch.
Preferably, the voltage limiting branch comprises a surge arrester MOV, wherein the surge arrester MOV is connected in parallel with the current source LC branch.
Preferably, the voltage-limiting branch can also consist of a gap G and a resistor R, wherein the gap G and the resistor R are connected in series and then connected in parallel with the current source LC branch
Preferably, the arc initiation branch comprises an arc initiation resistor Ri and a bypass switch S4, wherein one end of the arc initiation resistor Ri and the bypass switch S4 after being connected in parallel is connected with the current source LC branch, and the other end of the arc initiation resistor Ri and the bypass switch S4 after being connected in parallel is connected with the auxiliary switch.
Preferably, the auxiliary switch comprises an auxiliary breaker AB, wherein two ends of the auxiliary breaker AB are respectively connected with the arc striking branch and the sample dc breaker.
Preferably, the two-level voltage source comprises a two-level voltage source input switch S2, a two-level voltage source inductor Lu, a two-level voltage source capacitor Cu1, a two-level voltage source capacitor Cu2, a short-circuit resistor Ru, and a short-circuit switch S3, wherein one end of the two-level voltage source input switch S2 is connected to the auxiliary switch, and the other end of the two-level voltage source input switch S2 is sequentially connected in series with the two-level voltage source inductor Lu, the two-level voltage source capacitor Cu1, and the two-level voltage source capacitor Cu 2; the short-circuit resistor Ru is connected in series with the short-circuit switch S3 and then connected in parallel with the two-level voltage source capacitor Cu 2; one end of the two-level voltage source capacitor Cu2 is grounded.
Preferably, the test sample dc breaker may be a test sample mechanical dc breaker or a test sample hybrid dc breaker.
A synthetic test method for a direct current breaker with two-level voltage sources is based on a synthetic test loop of the direct current breaker with two-level voltage sources and comprises the following steps:
a closing switch S1 of the current source LC branch circuit is closed, and a current source capacitor Ci discharges through a loop formed by a current source and a direct current breaker; when the preset delay time is reached, the auxiliary switch is switched off, and the arcing state is kept; when the auxiliary switch reaches the effective opening distance, a bypass switch S4 of the arc striking branch is switched on, and the current in a loop formed by the current source and the test sample direct current breaker quickly rises; when the current of the test sample direct current breaker reaches a preset current, a switch inside the test sample direct current breaker is switched on and off according to a preset time sequence logic, and transient on-off voltage appears at two ends of the test sample direct current breaker; when the transient cut-off voltage rises to a preset voltage value of the voltage limiting branch, the action of the lightning arrester of the voltage limiting branch is changed from a high-resistance state to a low-resistance state or the gap G of the voltage limiting branch is conducted, and the current of the current limiting branch starts to rise; when the current of the voltage limiting branch reaches a preset amplitude value, the input switch S2 of the two level voltage sources is switched on, the current of the auxiliary switch quickly passes zero through the input of the two level voltage sources, the electric arc of the auxiliary switch is extinguished, and the current source part is electrically isolated from the test sample; when the voltage duration time at the two ends of the test sample direct current circuit breaker reaches the preset time, the short-circuit switch S3 in the two-level voltage source is closed, the voltage at the two ends of the test sample direct current circuit breaker begins to drop, and finally the voltage at the two ends of the test sample direct current circuit breaker is maintained at the preset system rated direct current voltage.
Further, before the test, the direct current circuit breakers of the test products without energy consumption loops are connected in parallel at two ends of the two-level voltage source; the switches of the current source LC branch circuit, the arc striking branch circuit, the two-level voltage source and the current conversion branch circuit of the sample direct current circuit breaker are in a breaking isolation state; the auxiliary switch and the switch of the main branch of the test sample direct current breaker are in a closed conducting state; meanwhile, the current source capacitor Ci, the two-level voltage source capacitor Cu1, and the two-level voltage source capacitor Cu2 are charged to the corresponding voltages.
Compared with the prior art, the invention has the beneficial effects that:
the two-level voltage source DC circuit breaker synthesis test loop provided by the invention has the advantages that the two-level voltage source equivalent transient on-off voltage can ensure enough transient on-off voltage and duration time during the test, and the DC system voltage U required to be borne by the DC circuit breaker after the DC circuit breaker is switched on and off can be provideddcThe test loop is simple and has high equivalence;
meanwhile, the voltage limiting branch is used for protecting the current source, the current of the voltage limiting branch is used as the trigger of the two-level voltage source, the voltage provided by the two-level voltage source can be smoothly connected with the current source while the current source is ensured to provide enough transient on-off voltage rising rate in the voltage rising period, and the obtained transient on-off voltage is more consistent with the actual transient on-off voltage.
And secondly, the auxiliary circuit breaker AB is used for electrically isolating the current source part so as to realize the switching between the current source and the two level voltage sources, the current source and the two level voltage sources are matched with each other, so that complete current and voltage stress can be applied in the switching-on and switching-off process of the direct current circuit breaker, and the test loop has a simple structure and high economical efficiency.
In conclusion, the invention has wide applicability, the test parameters are easy to adjust, and the requirements of different on-off currents and transient on-off voltages of the direct current circuit breaker can be met.
Drawings
Fig. 1 is a waveform diagram of a breaking process of a direct current breaker;
FIG. 2 is a schematic block diagram of a DC circuit breaker synthetic test loop of a two-level voltage source provided by the present invention;
FIG. 3 is a circuit diagram of a synthetic test loop of a DC circuit breaker with two-level voltage source according to the present invention;
fig. 4 is a structural diagram of a mechanical dc circuit breaker of a sample in embodiment 1 according to the present invention;
fig. 5 is a schematic diagram of a test timing sequence of a synthetic test loop of a dc circuit breaker with a two-level voltage source in embodiment 1 according to the present invention;
fig. 6 is a schematic waveform diagram of a synthetic test loop of a dc circuit breaker with two-level voltage sources in embodiment 1 according to the present invention;
fig. 7 is another circuit diagram of the dc circuit breaker synthesizing test loop of the two-level voltage source provided by the present invention;
fig. 8 is a structural diagram of a hybrid dc circuit breaker of a sample in embodiment 2 according to the present invention;
fig. 9 is a schematic diagram of a test timing sequence of a synthetic test loop of a dc circuit breaker with a two-level voltage source in embodiment 2 according to the present invention;
fig. 10 is a schematic waveform diagram of a synthetic test loop of a dc circuit breaker with two-level voltage source according to embodiment 2 of the present invention;
the circuit comprises a current source LC branch, a voltage limiting branch, an arc striking branch, an auxiliary switch, a test sample DC breaker, a two-level voltage source 6, a main breaker VCB with a main branch 7, a commutation branch capacitor C with a main branch 8, a commutation branch inductor L with a main branch 9, a commutation branch switch S with a main branch 10, a power electronic switch with a main branch 11 and a power electronic switch with a commutation branch 12.
Detailed Description
The objects, advantages and embodiments of the invention are further illustrated by the following examples and figures. It should be understood that the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
As shown in fig. 1 to 10, the synthetic test circuit of the dc circuit breaker with two level voltage sources provided by the present invention includes a current source LC branch 1, a voltage limiting branch 2, an arc striking branch 3, an auxiliary switch 4 and a two level voltage source 6, wherein one end of the current source LC branch 1 connected in parallel with the voltage limiting branch 2 is sequentially connected in series with the arc striking branch 3 and the auxiliary switch 4, and the other end of the auxiliary switch 4 is connected with one end of a test sample dc circuit breaker 5; the other end of the current source LC branch 1 which is connected with the voltage limiting branch 2 in parallel is connected with the other end of the test sample DC breaker 5; and the two-level voltage source 6 is connected in parallel with two ends of the test sample direct current breaker 5.
Specifically, the method comprises the following steps:
the current source LC branch circuit 1 comprises a capacitor Ci, an inductor Li and a closing switch S1 which are sequentially connected in series; the voltage limiting branch 2 comprises an arrester MOV; wherein the arrester MOV is connected in parallel with the current source LC branch 1.
The voltage limiting branch 2 can also use a gap G and a resistor R, wherein the gap G and the resistor R are connected in series and then connected with the current source LC branch in parallel.
The arc striking branch circuit 3 comprises an arc striking resistor Ri and a bypass switch S4 which are connected in parallel, wherein one end of the arc striking resistor Ri is connected with the current source LC branch circuit 1, and the other end of the arc striking resistor Ri is connected with the auxiliary switch 4.
The auxiliary switch 4 comprises an auxiliary breaker AB, wherein the two ends of the auxiliary breaker AB are connected with the arc starting branch 3 and the two-level voltage source 6, respectively.
The two-level voltage source 6 comprises a two-level voltage source input switch S2, a two-level voltage source inductor Lu, a two-level voltage source capacitor Cu1, a two-level voltage source capacitor Cu2, a short-circuit resistor Ru and a short-circuit switch S3, wherein one end of the two-level voltage source input switch S2 is connected with the auxiliary switch, and the other end of the two-level voltage source input switch S2 is sequentially connected with the two-level voltage source inductor Lu, the two-level voltage source capacitor Cu1 and the two-level voltage source capacitor Cu2 in series; the short-circuit resistor Ru is connected in series with the short-circuit switch S3 and then connected in parallel with the two-level voltage source capacitor Cu 2; one end of the two-level voltage source capacitor Cu2 is grounded.
Example 1
The invention provides a synthetic test loop of a direct current breaker with two level voltage sources, as shown in fig. 2 and fig. 3, comprising a current source LC branch 1, a voltage limiting branch 2, an arc striking branch 3, an auxiliary switch 4 and a two level voltage source 6, wherein the current source LC branch 1 comprises: the capacitor Ci, the inductor Li and the closing switch S1 are sequentially connected in series;
the voltage limiting branch 2 comprises a surge arrester MOV.
The arc starting branch 3 includes: an arc starting resistor Ri and a bypass switch S4 connected in parallel.
The auxiliary switch 4 comprises an auxiliary breaker AB.
The two-level voltage source 6 includes: two-level voltage source input switch S2, two-level voltage source inductor Lu, two-level voltage source capacitor Cu1, two-level voltage source capacitor Cu2, short-circuit resistor Ru and short-circuit switch S3, wherein: one end of a two-level voltage source input switch S2 is connected with the auxiliary switch, and the other end of the two-level voltage source input switch S2 is sequentially connected with a two-level voltage source inductor Lu, a two-level voltage source capacitor Cu1 and a two-level voltage source capacitor Cu2 in series; the short-circuit resistor Ru is connected in series with the short-circuit switch S3 and then connected in parallel with the two-level voltage source capacitor Cu 2; one end of the two-level voltage source capacitor Cu2 is grounded.
The current source LC branch circuit 1 is connected with the voltage limiting branch circuit 2 in parallel, then is sequentially connected with the arc striking branch circuit 3 and the auxiliary switch 4 in series, and then is connected with two ends of the test sample direct current breaker 5 in parallel like the two level voltage sources 6.
In this embodiment 1, the main function of the current source LC branch 1 is to generate low-frequency oscillating current to provide the required switching current for the dc circuit breaker, and at the same time, provide sufficient transient switching voltage rise rate during the voltage rise period; the voltage limiting branch 2 is mainly used for limiting the voltage at two ends of the test sample direct current breaker; the main function of the arc ignition branch 3 is to increase the arc burning time of the auxiliary switch; the main function of the auxiliary switch 4 is to electrically isolate the current source part to realize the switching between the current source and the two-level voltage source; the main function of the two-level voltage source 6 is to provide sufficient transient switching-off voltage and duration, and the dc system voltage to be endured after the dc breaker is switched off.
As shown in fig. 4, the sample mechanical dc circuit breaker in embodiment 1 includes a main circuit breaker 7 of a main branch, a commutation branch capacitor 8, a commutation branch inductor 9, and a commutation branch switch 10, where the main circuit breaker 7, the commutation branch capacitor 8, the commutation branch inductor 9, and the commutation branch switch 10 are sequentially connected in series.
Fig. 5 is a timing diagram of a specific test operation in embodiment 1 of the present invention, and fig. 6 is a schematic diagram of a test waveform in embodiment 1 of the present invention, which is described in detail below with reference to fig. 5 and 6:
(1) before the test, the current source LC branch closing switch S1, the arc striking branch bypass switch S4, the two-level voltage source input switch S2, the short-circuit switch S3 and the commutation branch switch 10 are in a breaking isolation state, and the auxiliary breaker AB is in a closed conduction state; a current source LC branch circuit capacitor Ci, a current conversion branch circuit capacitor C, two-level voltage source capacitors Cu1 and Cu2 are charged to corresponding voltages;
(2) at the time of t0, a closing switch S1 of a current source LC branch circuit is closed, and a current source capacitor Ci discharges through a loop formed by a current source and a direct-current breaker;
(3) at the time of t1, the auxiliary breaker AB is opened, and the arcing state is kept;
(4) at the time of t2, the auxiliary breaker AB reaches an effective opening distance, the arc striking branch bypass switch S4 is switched on, and the current in a loop formed by the current source and the test mechanical direct-current breaker rapidly rises;
(5) at the time t3, the main circuit breaker 7 of the mechanical direct current circuit breaker of the test sample is opened, and the arcing state is kept;
(6) at the time of t4, the current of the test mechanical direct current circuit breaker reaches the preset cut-off current, a commutation branch switch 10 of the test mechanical direct current circuit breaker is switched on, a commutation branch capacitor 8 and a commutation branch inductor 9 oscillate to generate reverse current so that the current of a main circuit breaker of the test mechanical direct current circuit breaker crosses zero, the electric arc of the main circuit breaker 7 is extinguished, and transient cut-off voltages are generated at two ends of the test mechanical direct current circuit breaker; when the transient cut-off voltage rises to a preset voltage value of the voltage limiting branch, the action of the lightning arrester of the voltage limiting branch is changed from a high-resistance state to a low-resistance state, and the current of the current limiting branch 2 starts to rise;
(7) at the time of t5, when the current of the voltage limiting branch 2 reaches the preset amplitude, the two-level voltage source input switch S2 is closed, the current of the two-level voltage source 6 enables the current of the auxiliary circuit breaker AB to rapidly cross zero, the arc of the auxiliary circuit breaker AB is extinguished, and the current source is electrically isolated from the test mechanical direct current circuit breaker;
(8) at the time of t6, when the voltage duration time at the two ends of the mechanical direct-current circuit breaker of the test sample reaches the preset time, closing a short-circuit switch S3, discharging the two-level voltage source capacitor Cu2 through a short-circuit resistor Ru, starting to reduce the voltage at the two ends of the main circuit breaker, and finally maintaining the voltage at the two ends of the mechanical direct-current circuit breaker of the test sample at the preset system rated direct-current voltage;
the time t0, the time t1, and the time t2, the time t … …, and the time t6 correspond to the time t0, the time t1, and the time t2 … …, and the time t6 of the timing chart and the test waveform schematic diagram, respectively.
As shown in fig. 6, the current source and the two-level voltage source respectively act on the mechanical dc circuit breaker through timing coordination, the current source generates low-frequency oscillation current to provide the required on-off current for the mechanical dc circuit breaker, and simultaneously provides sufficient transient on-off voltage increase rate during the voltage increase period, and the two-level voltage source provides sufficient transient on-off voltage and duration, and dc system voltage to be endured after the dc circuit breaker is turned on and off. The mechanical direct current circuit breaker and the direct current circuit breaker are matched with each other to provide complete current and voltage stress assessment, and the on-off performance of the mechanical direct current circuit breaker is verified reliably.
Example 2
The dc circuit breaker synthetic test circuit of the two-level voltage source provided in embodiment 2 of the present invention, as shown in fig. 2 and 7, includes a current source LC branch 1, a voltage limiting branch 2, an arc striking branch 3, an auxiliary switch 4, and a two-level voltage source 6, where the current source LC branch 1 includes: the capacitor Ci, the inductor Li and the closing switch S1 are sequentially connected in series;
the voltage limiting branch 2 comprises: a gap G and a resistor R connected in series.
The arc starting branch 3 includes: an arc starting resistor Ri and a bypass switch S4 connected in parallel.
The auxiliary switch 4 comprises an auxiliary breaker AB.
The two-level voltage source 6 includes: two-level voltage source input switch S2, two-level voltage source inductor Lu, two-level voltage source capacitor Cu1, two-level voltage source capacitor Cu2, short-circuit resistor Ru and short-circuit switch S3, wherein: one end of a two-level voltage source input switch S2 is connected with the auxiliary switch, and the other end of the two-level voltage source input switch S2 is sequentially connected with a two-level voltage source inductor Lu, a two-level voltage source capacitor Cu1 and a two-level voltage source capacitor Cu2 in series; the short-circuit resistor Ru is connected in series with the short-circuit switch S3 and then connected in parallel with the two-level voltage source capacitor Cu 2; one end of the two-level voltage source capacitor Cu2 is grounded.
The current source LC branch circuit 1 is connected with the voltage limiting branch circuit 2 in parallel, then is sequentially connected with the arc striking branch circuit 3 and the auxiliary switch 4 in series, and then is connected with two ends of the test sample direct current breaker 5 in parallel like the two level voltage sources 6.
As shown in fig. 8, the sample hybrid dc circuit breaker in embodiment 2 includes a main circuit breaker 7 of a main branch, a circuit electronic switch 11 of the main branch, and power electronic switches 12 of a plurality of commutation branches, wherein the main circuit breaker 7 of the main branch, the circuit electronic switch 11 of the main branch, and the power electronic switches 12 of the plurality of commutation branches are sequentially connected in series.
Fig. 9 is a timing diagram of a specific test operation in embodiment 2 of the present invention, and fig. 10 is a schematic diagram of a test waveform in embodiment 2 of the present invention, which is described in detail below with reference to fig. 9 and 10:
(1) before a test, a switch-on S1 of a current source LC branch, an arc-striking branch bypass switch S4, a two-level voltage source input switch S2 and a short-circuit switch S3 are in a breaking isolation state, a power electronic switch 12 of a current conversion branch is in a locking state, an auxiliary circuit breaker AB, a main circuit breaker 7 of a main branch and a circuit electronic switch 11 of the main branch are in a conducting state, and a current source LC branch capacitor Ci, a two-level voltage source capacitor Cu1 and Cu2 are charged to corresponding voltages;
(2) at the time of t0, a closing switch S1 of a current source LC branch circuit is closed, and a current source capacitor Ci discharges through a loop formed by a current source and a direct-current breaker;
(3) at the time of t1, the auxiliary breaker AB is opened, and the arcing state is kept;
(4) at the time of t2, the auxiliary breaker AB reaches an effective opening distance, the arc striking branch bypass switch S4 is switched on, and the current in a loop formed by the current source and the test sample mixed direct-current breaker rapidly rises;
(5) at the time t3, the main branch power electronic switch 11 of the sample hybrid direct-current circuit breaker is closed;
(6) at the time t4, the main branch current of the test sample hybrid direct current breaker drops to zero, and the main breaker 7 of the main branch is opened;
(7) at the time t5, the power electronic switch 12 of the current conversion branch is locked, and the transient switching-off voltage at the two ends of the sample hybrid direct-current circuit breaker rapidly rises; when the transient cut-off voltage rises to a preset voltage value of the voltage limiting branch, the ball gap G of the voltage limiting branch is conducted, and the current of the current limiting branch 2 starts to rise;
(8) at the time of t6, when the current of the voltage limiting branch 2 reaches a preset amplitude value, the two-level voltage source input switch S2 is closed, the current of the two-level voltage source 6 enables the current of the auxiliary circuit breaker AB to rapidly cross zero, the electric arc of the auxiliary circuit breaker AB is extinguished, and the current source and the test sample mixed direct current circuit breaker are electrically isolated;
(9) at the time of t7, when the voltage duration time at the two ends of the sample hybrid direct-current circuit breaker reaches the preset time, the short-circuit switch S3 is closed, the two-level voltage source capacitor Cu2 discharges through the short-circuit resistor Ru, the voltage at the two ends of the sample hybrid direct-current circuit breaker begins to drop, and finally the voltage at the two ends of the sample hybrid direct-current circuit breaker is maintained at the preset system rated direct-current voltage.
The time t0, the time t1, and the time t2, the time t … …, and the time t7 correspond to the time t0, the time t1, and the time t2 … …, and the time t7 of the timing chart and the test waveform schematic diagram, respectively.
As shown in fig. 10, a current source and a two-level voltage source are respectively applied to the sample hybrid dc circuit breaker through timing coordination, the current source generates a low-frequency oscillating current to provide a required breaking current for the hybrid dc circuit breaker, and simultaneously provides a sufficient transient breaking voltage rise rate during a voltage rise period, the two-level voltage source provides a sufficient transient breaking voltage and duration, and a dc system voltage to be endured after the hybrid dc circuit breaker is broken. The two are mutually matched to provide complete current and voltage stress assessment for the hybrid direct current circuit breaker, and the switching-on and switching-off performance of the hybrid direct current circuit breaker is reliably verified.
The above description is only for the purpose of illustrating preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and modifications, variations or substitutions that can be easily made by those skilled in the art within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a two level voltage source's direct current circuit breaker synthetic test return circuits, its characterized in that, the return circuit includes current source and two level voltage source (6), current source and two level voltage source (6) all connect in parallel at sample direct current circuit breaker (5) both ends.
2. The DC breaker synthesis test loop of a two-level voltage source according to claim 1, wherein the current source comprises a current source LC branch (1), a voltage limiting branch (2), an arc striking branch (3) and an auxiliary switch (4), wherein one end of the current source LC branch (1) connected in parallel with the voltage limiting branch (2) is sequentially connected in series with the arc striking branch (3) and the auxiliary switch (4), and the other end of the auxiliary switch (4) is connected with one end of a test sample DC breaker (5); the other end of the current source LC branch (1) is grounded after being connected with the voltage limiting branch (2) in parallel.
3. The two-level voltage source direct current breaker synthesis test loop of claim 2, wherein the current source LC branch (1) comprises a capacitor Ci, an inductor Li and a closing switch S1, wherein one end of the capacitor Ci is connected with the inductor Li and the closing switch S1 in series in sequence; the other end of the capacitor Ci is connected with the voltage limiting branch (2) in parallel and then one end of the capacitor Ci is grounded; the free end of the closing switch S1 is connected in parallel with the other end of the voltage limiting branch (2) and then connected in series with the arc striking branch (3).
4. The circuit breaker synthesis test circuit of a two-level voltage source according to claim 2, characterized in that the voltage limiting branch (2) comprises an arrester MOV, wherein the arrester MOV is connected in parallel with the current source LC branch (1).
5. The DC breaker synthetic test loop of two-level voltage source according to claim 2, wherein the voltage limiting branch (2) comprises a gap G and a resistor R, wherein the gap G and the resistor R are connected in series and then connected in parallel with the current source LC branch (1).
6. The circuit breaker synthesis test loop of two-level voltage source according to claim 2, characterized in that the arc-striking branch (3) comprises an arc-striking resistor Ri and a bypass switch S4, wherein one end of the arc-striking resistor Ri and the bypass switch S4 after being connected in parallel is connected with the current source LC branch (1), and the other end of the arc-striking resistor Ri and the bypass switch S4 after being connected in parallel is connected with the auxiliary switch (4).
7. The two-level voltage source DC breaker synthesis test loop according to claim 2, wherein the auxiliary switch (4) comprises an auxiliary breaker AB, wherein two ends of the auxiliary breaker AB are respectively connected with the arc striking branch (3) and the sample DC breaker (5).
8. The DC breaker synthesis test loop of claim 1, wherein the two-level voltage source (6) comprises a two-level voltage source input switch S2, a two-level voltage source inductor Lu, a two-level voltage source capacitor Cu1, a two-level voltage source capacitor Cu2, a short-circuit resistor Ru and a short-circuit switch S3, wherein one end of the two-level voltage source input switch S2 is connected to the auxiliary switch (4), and the other end of the two-level voltage source input switch S2 is connected to the two-level voltage source inductor Lu, the two-level voltage source capacitor Cu1 and the two-level voltage source capacitor Cu2 in series; the short-circuit resistor Ru is connected in series with the short-circuit switch S3 and then connected in parallel with the two-level voltage source capacitor Cu 2; one end of the two-level voltage source capacitor Cu2 is grounded.
9. A method for testing the composition of a two-level voltage source dc circuit breaker, according to any one of claims 1 to 8, comprising the steps of:
a closing switch S1 of the current source LC branch circuit (1) is closed, and a current source capacitor Ci discharges through a loop formed by a current source and a direct current breaker; when the preset delay time is reached, the auxiliary switch (4) is switched off, and the arcing state is kept; when the auxiliary switch (4) reaches an effective opening distance, a bypass switch S4 of the arc striking branch (3) is conducted, and the current in a loop formed by the current source and the test sample direct current breaker (5) rises rapidly; when the current of the test sample direct current breaker (5) reaches a preset current, a switch inside the test sample direct current breaker (5) is switched on and off according to a preset time sequence logic, and transient switching-on and switching-off voltage appears at two ends of the test sample direct current breaker (5); when the transient cut-off voltage rises to a preset voltage value of the voltage limiting branch (2), the action of the lightning arrester of the voltage limiting branch (2) is changed from a high-resistance state to a low-resistance state or a gap G of the voltage limiting branch (2) is conducted, and the current of the current limiting branch (2) starts to rise; when the current of the voltage limiting branch (2) reaches a preset amplitude value, an input switch S2 of the two level voltage sources (6) is switched on, the current of the auxiliary switch (4) quickly passes zero through the input of the two level voltage sources (6), the electric arc of the auxiliary switch (4) is extinguished, and the current source is electrically isolated from the test sample direct current circuit breaker; when the voltage duration time at the two ends of the test sample direct current circuit breaker (5) reaches the preset time, a short-circuit switch S3 in the two-level voltage source (6) is closed, the voltage at the two ends of the test sample direct current circuit breaker (5) begins to drop, and finally the voltage at the two ends of the test sample direct current circuit breaker (5) is maintained at the preset system rated direct current voltage.
10. The method for testing the synthesis of the direct current circuit breaker with the two-level voltage source according to claim 9, wherein before the test, the direct current circuit breaker (5) without the energy consumption loop of the test sample is connected in parallel with two ends of the two-level voltage source (6); the switches of the current source LC branch circuit (1), the arc striking branch circuit (3), the two-level voltage source (6) and the current conversion branch circuit of the sample direct current breaker are in a breaking and isolating state; the auxiliary switch (4) and the switch of the main branch of the test sample direct current breaker are in a closed conducting state; meanwhile, the current source capacitor Ci, the two-level voltage source capacitor Cu1, and the two-level voltage source capacitor Cu2 are charged to the corresponding voltages.
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