CN103312188B - For power supply and the method for testing thereof of reactor performance test in power electronic equipment - Google Patents

Abstract

The invention provides a power supply for testing the performance of a reactor in a power electronic device and a testing method thereof, including a three-phase step-up transformer T1, an output terminal of the three-phase step-up transformer T1 and an input of a three-phase phase-controlled rectifier bridge SCR The output terminals of the three-phase phase-controlled rectifier bridge SCR are divided into two circuits, and the first contact a1 is set on the first branch, and the second branch is in phase with an input terminal of the first three-phase converter VSI1. connection, the other input terminal of the first three-phase converter VSI1 is provided with a second contact a2 corresponding to the first contact a1; the input terminal of the second three-phase converter VSI2 is connected in parallel with the first three-phase converter The input terminal of the converter VSI1; the three-phase output terminals of the first three-phase converter VSI1 and the second three-phase converter VSI2 are correspondingly provided with three pairs of contacts, and the three-phase output terminals of the second three-phase converter VSI2 are connected to the three connected to the input of the phase step-up transformer T1. It can realize different circuit topologies, and further realize the practical application of time-sharing simulation of various power electronic circuits with a set of test equipment.

Description

Power supply and test method for reactor performance test in power electronic device

technical field

The invention relates to the technical field of performance performance of reactors used in power electronic circuits, in particular to a power supply for performance testing of reactors in power electronic devices and a testing method thereof.

Background technique

At present, my country's testing of reactors is mainly based on the "National Standard of the People's Republic of China GB10229-88 Reactor" and "National Standard of the People's Republic of China GB1094.2-1996 Temperature Rise of Power Transformers". This standard defines the standard for the common application of large-capacity reactors, and for other special reactors in the absence of corresponding national standards, only part or all of the standards can be used.

Reactor testing is divided into voltage and current testing. At present, there are relatively mature power supply equipment for testing various voltage levels of reactors in China. Transformer manufacturers such as Xi'an Transformer Factory and Shenyang Transformer Factory have been able to carry out withstand voltage tests for reactors below 800KV. There is no corresponding test standard in China for the current test of the reactor in the power electronic device, so only part or all of the reactor test standard can be used.

The test current of reactors used in power electronic devices usually adopts a conversion method, that is, the ripple current and harmonic current are converted into fundamental wave current (or DC current) through a certain conversion relationship, and then the converted fundamental wave current is used to Current (or DC current) to test the reactor. However, the conversion relationship is generally obtained based on engineering experience. Testing the reactor with the converted current cannot accurately reflect the actual working performance. Therefore, the performance of the reactor test is often inconsistent with the performance of the actual application. Especially for high-power power electronic devices, the difference in performance is more obvious. Therefore, the traditional test power supply can no longer meet the test requirements for reactors in high-power power electronic devices.

In recent years, there have been many researches and applications of programmable power supplies at home and abroad, and the research and applications of harmonic current sources have gradually become a hot spot. At present, some reactor manufacturers in China have used programmable power supplies to test reactors used in power electronic devices. However, the capacity of these programmable power supplies is small, the output current cannot reach the current level required for reactor testing, and the performance is single, and can only be used to output a certain type (or type) of current waveform, that is, it can only be used to Test one (or one type) of reactors. For reactor manufacturers, it is a great burden for enterprises to realize the test of various reactors, that is, to purchase various large-capacity programmable power supplies. .

Contents of the invention

In view of the above defects or deficiencies, the present invention provides a power supply and a testing method thereof for performance testing of reactors in power electronic devices.

Technical scheme of the present invention is:

A power supply for reactor performance testing in power electronic devices, including a three-phase step-up transformer T1, a three-phase phase-controlled rectifier bridge SCR, a first three-phase converter VSI1 and a second three-phase converter VSI2, Wherein, the output terminal of the three-phase step-up transformer T1 is connected with the input terminal of the three-phase phase-controlled rectifier bridge SCR, and the output terminal of the three-phase phase-controlled rectifier bridge SCR is divided into two circuits, and the first DC capacitor is connected in parallel between the two circuits C1, and the first contact a1 is set on the first branch, the second branch is connected with one input end of the first three-phase converter VSI1, and the other input end of the first three-phase converter VSI1 is set with The second contact a2 corresponding to the first contact a1; the input terminal of the second three-phase converter VSI2 is connected in parallel with the input terminal of the first three-phase converter VSI1; the first three-phase converter VSI1 and the second The three-phase output terminals of the three-phase converter VSI2 are correspondingly provided with three pairs of contacts, the three-phase output terminals of the second three-phase converter VSI2 are connected to the input terminals of the three-phase step-up transformer T1, and the second three-phase converter The output terminal of the device VSI2 is connected with a three-phase reactor L1.

The input end of the first three-phase converter VSI1 is connected in parallel with a second DC electrode C2.

A circuit breaker K1 is connected between the three-phase step-up transformer T1 and the power supply.

The output end of the three-phase step-up transformer T1 is connected to a first AC contactor K2.

A second AC contactor K3 is also connected between the three-phase output terminal of the second three-phase converter VSI2 and the input terminal of the three-phase step-up transformer T1.

A method for testing a power supply for testing the performance of a reactor in a power electronic device, comprising the following steps:

1) When performing a grid reactor test circuit:

Firstly, connect the three-phase interface of the reactor under test to the three-phase output terminals of the first three-phase converter VSI1 and the second three-phase converter VSI2 respectively, and respectively set three pairs of contacts;

Secondly, the contact a1 is connected with the contact a2 to form a test loop, wherein the first three-phase converter VSI1 conducts a current test on the tested reactor, and the second three-phase converter VSI2 constitutes an active filter;

2) When performing BOOST reactor test circuit:

First, connect the interface of the reactor under test to the middle contact of the first contact a1 and the output end of the first three-phase converter VSI1;

Then, the BOOST low-voltage side uses the three-phase phase-controlled rectifier bridge SCR to stabilize the voltage, and adjusts the duty cycle of the BOOST switch to adjust the average current of the BOOST reactor.

The invention provides a power supply for testing the performance of a reactor in a power electronic device and a testing method thereof, by connecting the three-phase phase-controlled rectifier bridge SCR with the first three-phase converter VSI1 and the second three-phase converter The reactor VSI2 is connected, and a plurality of contacts are set. When performing a reactor performance test, the reactor under test can be connected to different contacts to realize different circuit topologies. Therefore, compared with the prior art, the present invention Not only the power can be greatly improved, but also a set of test equipment can be used to simulate the actual application occasions of various power electronic circuits in time-sharing, reproducing the application occasions of each reactor and the current waveform of the actual output working point; in addition, the reactor production Enterprises can accurately measure reactor parameters, change the current situation of inaccurate reactor parameter measurement, and at the same time save reactor manufacturers the cost of purchasing equipment and site construction costs.

Description of drawings

Fig. 1 is the power supply circuit diagram for the performance test of the reactor in the power electronic device provided by the present invention;

Fig. 2 is the grid-connected reactor test circuit diagram of the power supply for the reactor performance test in the power electronic device provided by the present invention;

Fig. 3 is a BOOST reactor test circuit diagram of the power supply used in the performance test of the reactor in the power electronic device provided by the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

Referring to Fig. 1, the present invention provides a power supply for performance testing of reactors in power electronic devices, including a three-phase step-up transformer T1 connected to an AC power supply, a three-phase phase-controlled rectifier bridge SCR, a first three Phase converter VSI1 and the second three-phase converter VSI2, and the wiring harness used to connect the reactor under test:

Wherein, a circuit breaker K1 is connected between the three-phase step-up transformer T1 and the power supply, and the output end of the three-phase step-up transformer T1 is connected to the first AC contactor K2, and the output end of the three-phase step-up transformer T1 is connected to the three-phase step-up transformer T1. The input terminals of the phase-controlled rectifier bridge SCR are connected to each other, and the output terminals of the three-phase phase-controlled rectifier bridge SCR are divided into two circuits, the first DC capacitor C1 is connected in parallel between the two circuits, and the first branch is provided with a first contact a1, the second branch is connected to one input terminal of the first three-phase converter VSI1, and the other input terminal of the first three-phase converter VSI1 is provided with a second contact corresponding to the first contact a1 a2, the input end of the first three-phase converter VSI1 is connected in parallel with a second DC electrode C2;

The input terminal of the second three-phase converter VSI2 is connected in parallel to the input terminal of the first three-phase converter VSI1; the three-phase output terminals of the first three-phase converter VSI1 are respectively provided with third, fourth and fifth interfaces b1 and b2 , b3, and the third contact b1 is grounded; the three-phase output terminal of the second three-phase converter VSI2 is provided with sixth, seventh and eighth contacts c1, c2 and c3 corresponding to the first three-phase converter VSI1, In addition, the three-phase output terminal of the second three-phase converter VSI2 is also connected to the input terminal of the three-phase step-up transformer T1, and the output terminal of the second three-phase converter VSI2 is connected to the three-phase reactor L1, and the second three-phase converter VSI2 is connected to the three-phase reactor L1. A second AC contactor K3 is also connected between the three-phase output terminal of the phase converter VSI2 and the input terminal of the three-phase step-up transformer T1.

The method for testing the performance of the reactor under test in the present invention is:

1) When performing a grid reactor test circuit:

First, connect the three-phase interface of the reactor under test to the third and sixth contacts b1 and c1; the fourth and seventh contacts b2 and c2; the fifth and eighth contacts b3 and c3;

Secondly, the contact a1 is connected with the contact a2 to form a test loop, wherein the first three-phase converter VSI1 conducts a current test on the tested reactor, and the second three-phase converter VSI2 constitutes an active filter; As shown in Figure 2, the reactor under test is placed at the position of L1.

Finally, according to the preset mode, the control system automatically controls the circuit breaker K1, the contactors K2 and K3 are closed, and finally realizes the circuit topology shown in Figure 2.

Working mechanism: Use a phase-controlled rectifier circuit to stabilize the voltage, use a three-phase converter to test the current of a single-phase reactor or a three-phase reactor (fundamental wave or any harmonic), and use another three-phase converter The converter is composed of an active filter to optimize the grid-connected power quality.

2) When performing BOOST reactor test circuit:

First, connect the interface of the reactor under test between the first contact a1 and the fourth contact b2 of the output end of the first three-phase converter VSI1;

Then, the BOOST low-voltage side uses the three-phase phase-controlled rectifier bridge SCR to stabilize the voltage, and adjusts the duty cycle of the BOOST switch to adjust the average current of the BOOST reactor.

See Figure 3, where the L2 position is the reactor under test. In order to realize the test, at this time, the reactor under test is first connected between a1 and b2, and then the control system automatically controls the circuit breaker K1 according to the preset mode, and the contactors K2 and K3 are closed, finally realizing the above-mentioned circuit topology.

Working mechanism: The BOOST low-voltage side uses a phase-controlled rectifier circuit to stabilize the voltage, and the BOOST high-voltage side uses a three-phase grid-connected converter to control and stabilize the voltage by controlling the active current injected into the grid. The average value of the current of the BOOST reactor is passed Adjust the duty cycle of the BOOST switch tube to adjust.

It should be noted that the multiple contacts in the present invention can have different connection modes, so as to realize the simulation of different actual application occasions of various power electronic circuits, and reproduce the application occasions of each reactor and the output of the actual working point. The current waveform is not limited to those listed in the examples.

The beneficial effects of the present invention are:

The ability of the power supply used to test the performance of the reactor in the power electronic device to output current under each topology is as follows:

In the grid reactor test, when the fundamental wave is added to the switching ripple, the fundamental wave can be output to 700A and the switching ripple is smooth and adjustable. When the harmonic is generated, it can be 1-20 times in a single time, and the combination can be 1-13 times. secondary combination.

The average current of the BOOST reactor can reach 250A.

Such current can basically satisfy the simulated live test of reactors in various applications, and can more accurately grasp the performance of reactors in actual working conditions. Moreover, this test power supply can be easily switched in various circuit topologies, adding The upper touch screen man-machine interface makes it easier for users to operate.

In addition, all experiments of this system can be connected to the grid, and the power quality of the grid side can be actively filtered, which can not only greatly reduce energy consumption, but also will not cause pollution to the grid.

Claims (6)

1. the power supply for reactor performance test in power electronic equipment, it is characterized in that: comprise three-phase voltage increasing transformer T1, three-phase phase control rectifier bridge SCR, first 3-phase power converter VSI1 and the second 3-phase power converter VSI2, wherein, the output of three-phase voltage increasing transformer T1 is connected with the input of three-phase phase control rectifier bridge SCR, the output of three-phase phase control rectifier bridge SCR is divided into two branch roads, the first DC capacitor C1 is parallel with between two branch roads, and the first branch road is provided with the first contact a1, second branch road is connected with an input of the first 3-phase power converter VSI1, another input of first 3-phase power converter VSI1 is provided with the second contact a2 corresponding with the first contact a1, second 3-phase power converter VSI2 input is parallel to the input of the first 3-phase power converter VSI1, first 3-phase power converter VSI1 is corresponding with the three-phase output end of the second 3-phase power converter VSI2 is provided with three pairs of contacts, the three-phase output end of the second 3-phase power converter VSI2 is connected with the input of three-phase voltage increasing transformer T1, and the output of the second 3-phase power converter VSI2 is connected with three-phase reactor L1.

2. the power supply for reactor performance test in power electronic equipment according to claim 1, is characterized in that: the input of described first 3-phase power converter VSI1 is parallel with the second DC capacitor C2.

3. the power supply for reactor performance test in power electronic equipment according to claim 1, is characterized in that: be connected with circuit breaker K1 between described three-phase voltage increasing transformer T1 and power supply.

4. the power supply for reactor performance test in power electronic equipment according to claim 1, is characterized in that: the output of described three-phase voltage increasing transformer T1 is connected with the first A.C. contactor K2.

5. the power supply for reactor performance test in power electronic equipment according to claim 1, is characterized in that: be also connected the second A.C. contactor K3 between the three-phase output end of described second 3-phase power converter VSI2 and the input of three-phase voltage increasing transformer T1.

6., based on the method for testing for the power supply of reactor performance test in power electronic equipment according to claim 1, it is characterized in that, comprise the following steps:

1) when carrying out grid-connected reactor test circuit:

First, three interfaces of tested reactor are connected to respectively the first 3-phase power converter VSI1 three pair contacts arranging corresponding to the three-phase output end of the second 3-phase power converter VSI2;

Secondly, be connected with contact a2 by contact a1, form test loop, wherein, the first 3-phase power converter VSI1 carries out testing current to tested reactor, and the second 3-phase power converter VSI2 is configured with source filter; Three-phase phase control rectifier bridge SCR is utilized to carry out voltage stabilizing, the first 3-phase power converter VSI1 is utilized to carry out testing current to single-phase reactor or three-phase reactor, utilize the second 3-phase power converter VSI2 composition to be configured with source filter simultaneously, optimize and network electric energy quality, wherein, described testing current comprises first-harmonic or stress_responsive genes secondary arbitrarily;

2) when carrying out BOOST reactor test circuit:

First, the interface of tested reactor is connected on the intermediate contact of the first contact a1 and the first 3-phase power converter VSI1 output;

Then, BOOST low-pressure side utilizes three-phase phase control rectifier bridge SCR to carry out voltage stabilizing, regulates the duty ratio of BOOST switching tube to regulate the average of the electric current of BOOST reactor; BOOST low-pressure side utilizes three-phase phase control rectifier bridge SCR to carry out voltage stabilizing, BOOST high-pressure side utilizes the first 3-phase power converter VSI1 to carry out control voltage stabilizing by the active current controlling to inject electrical network, and the mean value of the electric current of BOOST reactor is then by regulating the duty ratio of BOOST switching tube to regulate.