CN214011397U

CN214011397U - Electric reactor working condition simulation test circuit

Info

Publication number: CN214011397U
Application number: CN202023146200.8U
Authority: CN
Inventors: 朱国军; 唐德平; 王刚
Original assignee: Hefei Kewei Power System Co ltd
Current assignee: Cowell Technology Co ltd
Priority date: 2020-12-23
Filing date: 2020-12-23
Publication date: 2021-08-20
Anticipated expiration: 2030-12-23

Abstract

The utility model discloses a reactor operating mode simulation test circuit, including preceding stage PWM rectifier circuit and back level DCDC circuit, preceding stage PWM rectifier circuit includes the circuit breaker QF that connects in order, main contactor KM1, transformer T1, ACDC module and bus capacitor DC-Link, still include resistance R1 and circuit breaker KM2, circuit breaker QF is connected with the three-phase electric wire netting, the output of circuit breaker QF is received to resistance R1's one end, resistance R1's the other end passes through circuit breaker KM2 and is connected with transformer T1's primary side; the back level DCDC circuit includes that direct current changes direct current module DCDC1, direct current changes direct current module DCDC2, LC filtering module LC1, output contactor KM3, output contactor KM5 and is surveyed inductance L, the utility model has the advantages of: the test of simulating the actual working condition is carried out in advance, and the factory inspection of the reactor is perfected.

Description

Electric reactor working condition simulation test circuit

Technical Field

The utility model relates to a reactor operating mode simulation test technical field, more specifically relate to a reactor operating mode simulation test circuit.

Background

The reactor working condition simulation test device is a test device specially developed for a reactor, mainly has the functions of carrying out noise and temperature rise tests on the reactor under the actual use working condition, and is test equipment for testing the performance of the reactor. The equipment in the market only carries out short circuit ageing temperature rise test to the reactor at present, can not reflect the temperature rise under the operating condition and the noise condition of reactor under the operating condition. Therefore, when the problem of noise or temperature rise of the reactor occurs in the actual use, the test of simulating the actual working condition can not be carried out in advance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that when reactor noise or reactor temperature rise problem appear in the in-service use in prior art reactor operating mode simulation testing arrangement, the problem of simulation operating mode test can not be carried out in advance.

The utility model discloses a following technical means realizes solving above-mentioned technical problem: a working condition simulation test circuit of a reactor comprises a preceding-stage PWM (pulse-Width modulation) rectifying circuit and a later-stage DCDC (direct current-direct current) circuit, wherein the preceding-stage PWM rectifying circuit comprises a breaker QF, a main contactor KM1, a transformer T1, an ACDC module and a bus capacitor DC-Link which are sequentially connected, the former-stage PWM rectifying circuit also comprises a resistor R1 and a breaker KM2, the breaker QF is connected with a three-phase power grid, one end of the resistor R1 is connected to the output end of the breaker QF, and the other end of the resistor R1 is connected with the primary side of the transformer T1 through a breaker KM 2; the post-stage DCDC circuit comprises a direct current-to-direct current module DCDC1, a direct current-to-direct current module DCDC2, an LC filtering module LC1, an output contactor KM3, an output contactor KM5 and a detected inductor L, wherein the output end of a bus capacitor DC-Link is respectively connected with one end of the direct current-to-direct current module DCDC1 and one end of the direct current-to-direct current module DCDC2, the other end of the direct current-to-direct current module DCDC1, the LC filtering module LC1, one end of the output contactor KM3 and one end of the detected inductor L are sequentially connected, and the other end of the direct current-to-direct current module DCDC2, the other end of the output contactor KM5 and the other end of the detected inductor L are sequentially connected.

The utility model discloses a preceding stage PWM rectifier circuit accomplishes busbar voltage's establishment according to operating condition, direct current voltage under the operating condition is established in the simulation of direct current commentaries on classics direct current module DCDC1 among the back level DCDC circuit, ripple current and steady state current under the operating condition are established in the simulation of direct current commentaries on classics direct current module DCDC2, reactor operating condition simulation is realized to whole circuit, avoid appearing reactor noise and temperature rise problem at the customer scene, simulate operating condition test in advance, perfect the reactor inspection of dispatching from the factory.

Furthermore, the dc-dc module DCDC1 includes an IGBT Q1, an IGBT Q2, and a bus capacitor C1, wherein an emitter of the IGBT Q1 is connected to a collector of the IGBT Q2 and one end of the LC filter module LC1, respectively, a collector of the IGBT Q1 is connected to one end of the bus capacitor C1, and an emitter of the IGBT Q2 is connected to the other end of the bus capacitor C1.

Furthermore, the dc-dc module DCDC2 includes an IGBT Q3 and an IGBT Q4, an emitter of the IGBT Q3 is connected to a collector of the IGBT Q4 and one end of the output contactor KM5, respectively, a collector of the IGBT Q3 is connected to one end of the bus capacitor C1, and an emitter of the IGBT Q4 is connected to the other end of the bus capacitor C1.

Furthermore, the reactor working condition simulation test circuit further comprises a current transformer CT1, and the current transformer CT1 is located on a connecting line between an emitter of the IGBT tube Q1 and one end of the LC filter module LC 1.

Furthermore, the reactor working condition simulation test circuit further comprises a current transformer CT2, and the current transformer CT2 is located on a connecting line between an emitter of the IGBT tube Q3 and one end of the output contactor KM 5.

Further, the preceding stage PWM rectification circuit establishes a bus voltage of 500Vdc to 1100 Vdc.

Further, the dc-dc module DCDC1 outputs a stabilized dc voltage of 24Vdc to 1050 Vdc.

The utility model has the advantages that:

(1) the utility model discloses a preceding stage PWM rectifier circuit accomplishes busbar voltage's establishment according to operating condition, direct current voltage under the operating condition is established in the simulation of direct current commentaries on classics direct current module DCDC1 among the back level DCDC circuit, ripple current and steady state current under the operating condition are established in the simulation of direct current commentaries on classics direct current module DCDC2, reactor operating condition simulation is realized to whole circuit, avoid appearing reactor noise and temperature rise problem at the customer scene, simulate operating condition test in advance, perfect the reactor inspection of dispatching from the factory.

(2) The utility model discloses preceding stage PWM rectifier circuit accomplishes busbar voltage's establishment, realizes the two-way circulation of the energy of being incorporated into the power networks, and the current distortion rate that the guarantee was incorporated into the power networks simultaneously is little, and the power factor height is avoided producing adverse effect to the electric wire netting.

(3) The utility model discloses preceding stage PWM rectifier circuit is by input three-phase power grid connection circuit breaker QF, carry out soft start through resistance R1 and circuit breaker KM2 after the input and avoid impulse current, soft start is finished actuation main contactor KM1, main contactor KM1 connects step-down transformer T1, connect the ACDC module after transformer T1 steps down, output direct current busbar voltage connects busbar capacitance DC-Link and supports and maintain stable busbar voltage, direct current changes direct current module DCDC1 and carries out step-down chopper to busbar voltage, output voltage passes through LC filter module LC1 output expectation's direct current output voltage, then direct current changes direct current module DCDC2 and carries out control duty cycle according to the ripple current that sets up, output is connected through contactor KM3 and is surveyed electric induction L.

Drawings

FIG. 1 is a schematic diagram of a simulation test circuit for operating conditions of a reactor according to an embodiment of the present invention;

fig. 2 is the embodiment of the utility model discloses a direct current changes direct current module DCDC1 and direct current changes direct current module DCDC 2's schematic diagram among reactor operating mode simulation test circuit.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, the reactor working condition simulation test circuit comprises a preceding stage PWM rectifying circuit and a subsequent stage DCDC circuit, wherein the preceding stage PWM rectifying circuit comprises a breaker QF, a main contactor KM1, a transformer T1, an ACDC module, a bus capacitor DC-Link, a resistor R1 and a breaker KM2, which are connected in sequence, the breaker QF is connected with a three-phase power grid, one end of the resistor R1 is connected to an output end of the breaker QF, and the other end of the resistor R1 is connected with a primary side of the transformer T1 through a breaker KM 2; the post-stage DCDC circuit comprises a direct current-to-direct current module DCDC1, a direct current-to-direct current module DCDC2, an LC filtering module LC1, an output contactor KM3, an output contactor KM5 and a detected inductor L, wherein the output end of a bus capacitor DC-Link is respectively connected with one end of the direct current-to-direct current module DCDC1 and one end of the direct current-to-direct current module DCDC2, the other end of the direct current-to-direct current module DCDC1, the LC filtering module LC1, one end of the output contactor KM3 and one end of the detected inductor L are sequentially connected, and the other end of the direct current-to-direct current module DCDC2, the other end of the output contactor KM5 and the other end of the detected inductor L are sequentially connected.

The preceding stage PWM rectification circuit establishes a bus voltage of 500Vdc to 1100 Vdc. The direct current to direct current module DCDC1 outputs a stabilized direct current voltage of 24Vdc to 1050 Vdc. The output voltage of direct current-to-direct current module DCDC1 is confirmed or is set up the direct current voltage under the operating condition by the ripple current calculation according to the user setting, and direct current-to-direct current module DCDC2 output is according to the ripple frequency that the user set up under the operating condition, and ripple amplitude and current average value carry out the calculation control, and formula 1 to formula 5 below are referred to in the concrete calculation, the utility model discloses do not protect control logic and each formula, only protect hardware circuit framework.

Equation 1: ton + Toff ═ Tf;

equation 2: l Irip/Ton ═ dc-Udc 1;

equation 3: l Irip/Toff Udc 1;

equation 4: tf 1/F;

adjusting F, Tf, L and the like to obtain Udc or Irip meeting the factory requirements; the dc is bus voltage, F is frequency, Irip is ripple current, L is inductance value of the inductor L to be detected, Tf is period, Ton is start period, Toff is cut-off period, and Udc1 is output voltage of the dc-dc conversion module DCDC 1.

The input three-phase power grid is connected with a breaker QF, soft starting is carried out through a resistor R1 and a breaker KM2 after input to avoid impact current, a main contactor KM1 is attracted after soft starting is finished, the main contactor KM1 is connected with a step-down transformer T1, the ACDC module is connected after voltage reduction is carried out through a transformer T1, output direct-current bus voltage is connected with a bus capacitor DC-Link to support and maintain stable bus voltage, a direct-current-to-direct-current module DCDC1 carries out step-down chopping on the bus voltage, the output voltage outputs expected direct-current output voltage through an LC (inductor capacitor) 1, then the direct-current-to-direct-current module DCDC2 carries out duty ratio control according to set ripple current, and the output is connected with a detected inductor L through a contactor KM 3.

As shown in fig. 2, the dc-to-dc module DCDC1 and the dc-to-dc module DCDC2 form 2 bidirectional Buck circuits, the dc-to-dc module DCDC1 uses a bus capacitor C1 as a dc support capacitor to maintain a stable voltage Udc, an IGBT tube Q1 and an IGBT tube Q2 are switching power devices of the Buck circuit, and a current transformer CT1 detects current of a loop; the direct current-to-direct current module DCDC2 and the direct current-to-direct current module DCDC1 share a bus supporting capacitor, namely a bus capacitor C1, the IGBT tube Q3 and the IGBT tube Q4 are also switching power devices of a Buck circuit, and the current transformer CT2 detects the current of a detected inductor L. Specifically, the dc-dc conversion module DCDC1 includes an IGBT tube Q1, an IGBT tube Q2, and a bus capacitor C1, an emitter of the IGBT tube Q1 is connected to a collector of the IGBT tube Q2 and one end of the LC filter module LC1, respectively, a collector of the IGBT tube Q1 is connected to one end of the bus capacitor C1, and an emitter of the IGBT tube Q2 is connected to the other end of the bus capacitor C1.

With continued reference to fig. 2, the dc-dc module DCDC2 includes an IGBT Q3 and an IGBT Q4, an emitter of the IGBT Q3 is connected to a collector of the IGBT Q4 and one end of the output contactor KM5, respectively, a collector of the IGBT Q3 is connected to one end of the bus capacitor C1, and an emitter of the IGBT Q4 is connected to the other end of the bus capacitor C1.

With continued reference to fig. 2, the reactor operating condition simulation test circuit further includes a current transformer CT1, and the current transformer CT1 is located on a connection line between an emitter of the IGBT Q1 and one end of the LC filter module LC 1.

With continued reference to fig. 2, the reactor operating condition simulation test circuit further includes a current transformer CT2, and the current transformer CT2 is located on a connection line between the emitter of the IGBT Q3 and one end of the output contactor KM 5.

Through the technical scheme, the utility model provides a pair of reactor operating mode simulation test circuit, preceding stage PWM rectifier circuit accomplishes busbar voltage's establishment according to operating condition, direct current changes direct current module DCDC1 simulation among the later stage DCDC circuit and establishes the direct current voltage under the operating condition, ripple current and steady state current under the operating condition are established in the simulation of direct current change direct current module DCDC2, reactor operating condition simulation is realized to whole circuit, avoid appearing reactor noise and temperature rise problem at the customer scene, simulate the operating condition test in advance, perfect the reactor inspection of dispatching from the factory.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A reactor working condition simulation test circuit is characterized by comprising a preceding-stage PWM (pulse-Width modulation) rectifying circuit and a later-stage DCDC (direct current-direct current) circuit, wherein the preceding-stage PWM rectifying circuit comprises a breaker QF, a main contactor KM1, a transformer T1, an ACDC (alternating current direct current) module, a bus capacitor DC-Link, a resistor R1 and a breaker KM2 which are sequentially connected, the breaker QF is connected with a three-phase power grid, one end of the resistor R1 is connected to the output end of the breaker QF, and the other end of the resistor R1 is connected with the primary side of the transformer T1 through a breaker KM 2; the post-stage DCDC circuit comprises a direct current-to-direct current module DCDC1, a direct current-to-direct current module DCDC2, an LC filtering module LC1, an output contactor KM3, an output contactor KM5 and a detected inductor L, wherein the output end of a bus capacitor DC-Link is respectively connected with one end of the direct current-to-direct current module DCDC1 and one end of the direct current-to-direct current module DCDC2, the other end of the direct current-to-direct current module DCDC1, the LC filtering module LC1, one end of the output contactor KM3 and one end of the detected inductor L are sequentially connected, and the other end of the direct current-to-direct current module DCDC2, the other end of the output contactor KM5 and the other end of the detected inductor L are sequentially connected.

2. The reactor working condition simulation test circuit according to claim 1, wherein the direct current-to-direct current module DCDC1 comprises an IGBT tube Q1, an IGBT tube Q2 and a bus capacitor C1, an emitter of the IGBT tube Q1 is respectively connected with a collector of the IGBT tube Q2 and one end of an LC1 filter module, a collector of the IGBT tube Q1 is connected with one end of the bus capacitor C1, and an emitter of the IGBT tube Q2 is connected with the other end of the bus capacitor C1.

3. The reactor working condition simulation test circuit according to claim 2, wherein the direct current-to-direct current module DCDC2 comprises an IGBT tube Q3 and an IGBT tube Q4, an emitter of the IGBT tube Q3 is connected with a collector of the IGBT tube Q4 and one end of the output contactor KM5, respectively, a collector of the IGBT tube Q3 is connected with one end of a bus capacitor C1, and an emitter of the IGBT tube Q4 is connected with the other end of the bus capacitor C1.

4. The reactor working condition simulation test circuit according to claim 2, further comprising a current transformer CT1, wherein the current transformer CT1 is located on a connecting line between an emitter of the IGBT tube Q1 and one end of the LC filter module LC 1.

5. The reactor working condition simulation test circuit according to claim 2, further comprising a current transformer CT2, wherein the current transformer CT2 is located on a connecting line between an emitter of the IGBT tube Q3 and one end of the output contactor KM 5.

6. The reactor working condition simulation test circuit according to claim 1, wherein the pre-stage PWM rectification circuit establishes a bus voltage of 500Vdc to 1100 Vdc.

7. The reactor working condition simulation test circuit according to claim 1, wherein the DC-DC module DCDC1 outputs a stabilized DC voltage of 24Vdc to 1050 Vdc.