CN113203912A - Current source converter valve equivalent power experiment circuit, system and method - Google Patents
Current source converter valve equivalent power experiment circuit, system and method Download PDFInfo
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- CN113203912A CN113203912A CN202110759577.0A CN202110759577A CN113203912A CN 113203912 A CN113203912 A CN 113203912A CN 202110759577 A CN202110759577 A CN 202110759577A CN 113203912 A CN113203912 A CN 113203912A
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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
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/162—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
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Abstract
The invention discloses an equivalent power experimental circuit, a system and a method for a current source converter valve, wherein the equivalent power experimental circuit for the current source converter valve comprises a direct current boosting and discharging loop, a first capacitor C1 branch, a second capacitor C2 branch, a first converter valve group branch, a second converter valve group branch, a first direct current reactance Ldc1 and a second direct current reactance Ldc 2; the first converter valve group branch comprises a first converter valve group and a first diode D1 which are connected in series; the second converter valve group branch comprises a second converter valve group and a second diode D2 which are connected in series; the invention can truly simulate the actual operation condition of the converter valves, and the two groups of converter valves simultaneously carry out tests, and has the advantages of simplicity, easy realization and high test efficiency.
Description
Technical Field
The invention belongs to the field of current source converter valve testing, and particularly relates to a current source converter valve equivalent power experimental circuit, a system and a method.
Background
The Current Source Converter (CSC) based on the fully-controlled device (e.g., Integrated Gate Commutated Thyristor-Integrated Thyristor, IGCT) has no problem of commutation failure, can supply power to a passive load, has strong overcurrent tolerance capability, and has wide application value in the fields of motor driving, dynamic reactive power compensation, wind power integration, direct Current ice melting and the like.
The complete type test of the fully-controlled CSC is an important means for ensuring the safe, reliable and stable operation of the CSC, and is also a foundation and a precondition for research, development and engineering application. The converter valve type test comprises an insulation test and an operation test, wherein the operation test mainly comprises a maximum continuous operation load test, a maximum temporary overload operation test, a minimum direct current voltage test, a fully-controlled device overcurrent turn-off test and a short-circuit current test.
The existing full-control CSC equivalent power experimental method has the following problems:
1. the actual operating conditions of the fully-controlled CSC cannot be truly reflected.
2. The experimental method is relatively complex to control and low in experimental efficiency.
Disclosure of Invention
Aiming at the problems, the invention provides an equivalent power experiment circuit, an equivalent power experiment system and an equivalent power experiment method for a current source converter valve, which are mainly used for a maximum continuous operation load experiment and a maximum temporary overload operation experiment of the converter valve.
An equivalent power experimental circuit of a current source converter valve comprises a direct current boosting and discharging loop, a first capacitor C1 branch, a second capacitor C2 branch, a first converter valve group branch, a second converter valve group branch, a first direct current reactance Ldc1 and a second direct current reactance Ldc 2;
the direct current boosting and discharging loop is connected with a three-phase power supply, and a first capacitor C1 branch is connected with the direct current boosting and discharging loop in series;
the first converter valve group branch is connected with the first capacitor C1 branch in parallel, and the second converter valve group branch is connected with the first converter valve group branch in parallel;
the first converter valve group branch comprises a first converter valve group and a first diode D1 which are connected in series;
the second converter valve group branch comprises a second converter valve group and a second diode D2 which are connected in series;
a first end of a first direct current reactance Ldc1 is respectively connected with a cathode of a full-control device of the first converter valve group and a cathode of a first diode D1, and a second end of the first direct current reactance Ldc1 is respectively connected with a first end of a second direct current reactance Ldc2 and a first end of a branch of a second capacitor C2;
the second end of the second direct current reactance Ldc2 is respectively connected with the anode of the diode of the second converter valve group and the anode of the second diode D2, and the second end of the branch of the second capacitor C2 is respectively connected with the cathode of the fully-controlled device of the second converter valve group and the anode of the first diode D1.
Furthermore, the cathode of the full-control device of the first converter valve group is connected with the cathode of a first diode D1, the anode of the diode of the first converter valve group is connected with the first end of the branch of the first capacitor C1, and the anode of the first diode D1 is connected with the second end of the branch of the first capacitor C1.
Furthermore, a gate electrode of a full-control device of the first converter valve group is connected with a pulse signal, and the first converter valve group is controlled to be switched on and off through the pulse signal.
Further, the anode of the diode of the first converter valve group is connected with the anode of the direct current boosting and discharging loop; the anode of the first diode D1 is connected to the negative pole of the dc boost and discharge circuit.
Further, the anode of the diode of the second converter valve group is connected with the anode of the second diode D2, the cathode of the full-control device of the second converter valve group is connected with the anode of the first diode D1, and the cathode of the second diode D2 is connected with the anode of the diode of the first converter valve group.
Furthermore, a gate electrode of a full-control device of the second converter valve group is connected with a pulse signal, and the first converter valve group is controlled to be switched on and off through the pulse signal.
Furthermore, the cathode of a full-control device of the second converter valve group is connected with the cathode of the direct-current boosting and discharging loop; the cathode of the second diode D2 is connected to the anode of the dc boost and discharge circuit.
Further, the branch of the first capacitor C1, the branch of the first converter valve group, the first diode D1, the branch of the first direct current resistor Ldc1 and the branch of the second capacitor C2 form a BUCK voltage reducing circuit, and the BUCK voltage reducing circuit is used for controlling the output voltage.
Furthermore, a branch of the second capacitor C2, the second dc reactance Ldc2, the second converter valve group, the second diode D2 and the branch of the first capacitor C1 form a BOOST voltage circuit, and the BOOST voltage circuit is used for controlling the output current.
Further, the direct current boosting and discharging circuit comprises a rectifying circuit, and the rectifying circuit is used for converting alternating current of the three-phase power supply into direct current.
The invention also provides a current source converter valve equivalent power experiment system, which comprises a current source converter valve equivalent power experiment circuit, a first PI controller and a second PI controller;
the first PI controller is used for driving a full-control device of the first converter valve group to be switched on, switched off or switched on according to a voltage negative feedback signal on a branch circuit of the second capacitor C2, so that the stable voltage output of the BUCK voltage reduction circuit is realized;
the second PI controller is used for driving a fully-controlled device of the second converter valve group to be switched on, switched off or switched on according to a current negative feedback signal on the second direct current reactance Ldc2, and output of stable current of the BOOST booster circuit is achieved.
The invention also provides an equivalent power experiment method of the current source converter valve, which comprises the following steps:
performing circuit connection according to the equivalent power experiment system of the current source converter valve;
selecting an input voltage Vdc1, an output voltage Vdc2 and an output current Idc 2;
the duty ratio of the first converter valve group is adjusted through a pulse signal by adopting voltage closed-loop control, and a stable voltage value Vdc2 is output;
the current closed-loop control is adopted, the duty ratio of the second converter valve group is adjusted through a pulse signal, and a set current value Idc2 is output;
and the fully-controlled devices of the first converter valve group and the second converter valve group are switched on, switched off or switched on at a set switching frequency according to the pulse signals, and run according to set time under the loads of the output voltage Vdc2 and the output current Idc2, so that the maximum continuous running load test of the first converter valve group and the second converter valve group is completed.
Further, the equivalent power experiment method of the current source converter valve further comprises the following steps:
and the fully-controlled device of the second converter valve group is switched on, switched off or switched on at the set switching frequency according to the pulse signal, and outputs 1.2 times of rated current values Idc3 of the first converter valve group and the second converter valve group, so that the maximum temporary overload test of the first converter valve group and the second converter valve group is completed.
The invention has the beneficial effects that: the actual operation working condition of the converter valves can be truly simulated, and the two groups of converter valves are tested simultaneously, so that the method has the advantages of simplicity, easiness in realization and high test efficiency.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 shows a circuit connection schematic of a fully controlled current source converter according to the prior art;
FIG. 2 is a schematic diagram of an equivalent power experimental circuit of a current source converter valve according to an embodiment of the invention;
FIG. 3 shows a control schematic block diagram of a current source converter valve equivalent power experiment system according to an embodiment of the invention;
FIG. 4 is a flow chart of a current source converter valve equivalent power experimental method according to an embodiment of the invention;
fig. 5 shows a schematic diagram of a conductible interval on the a-phase upper bridge arm converter valve group a according to the embodiment of the present invention.
In the figure: 1. a first converter valve group; 2. the second set of converter valves, A, B, C, represents a three-phase power supply.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic circuit diagram illustrating a fully-controlled CSC including 6 valve sets, and the fully-controlled current source converter includes an inductor L according to the prior artaInductor LbInductor LcCapacitor CaCapacitor CbCapacitor CcUpper valve group a, upper valve group b, upper valve group c, lower valve group a, lower valve group b, lower valve group c and inductor L0。
The upper valve group a, the upper valve group b, the upper valve group c, the lower valve group a, the lower valve group b and the lower valve group c are identical in structure, taking the upper valve group a as an example, a full-control device is adopted on the upper valve group a to be connected with a diode in series, and the anode of the full-control device is connected with the cathode of the diode.
The upper part of the valve group a is connected with the lower part of the valve group a in series, and the cathode of a full-control device on the valve group a is connected with the anode of a diode under the valve group a; the upper part of the valve group b is connected with the lower part of the valve group b in series, and the cathode of a full-control device on the valve group b is connected with the anode of a diode under the valve group b; the upper part of the valve group c is connected with the lower part of the valve group c in series, and the cathode of a full-control device on the valve group c is connected with the anode of a diode under the valve group c.
Valve group a upper valve group b upper and valveThe anodes of the diodes in the group c are connected with the inductor L0Is connected with the first end of the first connecting pipe; and the cathodes of the full-control devices under the valve group a, the valve group b and the valve group c are connected with each other.
Inductor LaA first end connected to a three-phase power supply A, an inductor LaThe second end is connected to a branch between the upper part of the valve group a and the lower part of the valve group a; inductor LbA first end connected to a three-phase power supply B, an inductor LbThe second end is connected to a branch between the upper part of the valve group b and the lower part of the valve group b; inductor LcA first end connected to a three-phase power supply C, an inductor LcThe second end is connected to the branch between the upper part of the valve block c and the lower part of the valve block c.
Capacitor CaFirst terminal and inductor LaIs connected to the second terminal of the capacitor CbFirst terminal and inductor LbIs connected to the second terminal of the capacitor CcFirst terminal and inductor LcIs connected to the second end of the first housing. Capacitor CaSecond terminal, capacitor CbSecond terminal and capacitor CcThe second ends are connected to each other.
When the fully-controlled CSC operates, the three-phase alternating current is rectified by the fully-controlled CSC to obtain direct-current voltageV dc. In addition, in order to block reverse voltage, each valve group is used as a bridge arm and a full-control device and diode series connection mode is adopted, as shown in fig. 1, bridge arm currents flow in one direction, the currents can only flow among different phases, and the maximum conduction time of each bridge arm is T/3 in one power frequency period.
Referring to fig. 2, fig. 2 shows a schematic diagram of an equivalent power experiment circuit of a current source converter valve according to an embodiment of the present invention.
The current source converter valve equivalent power experimental circuit comprises a direct current boosting and discharging circuit, a first capacitor C1 branch, a second capacitor C2 branch, a first converter valve group branch, a second converter valve group branch, a first direct current reactance Ldc1 and a second direct current reactance Ldc 2.
The direct current boosting and discharging loop is connected with a three-phase power supply, and the branch of the first capacitor C1 is connected with the direct current boosting and discharging loop in series.
The first converter valve group branch is connected with the first capacitor C1 branch in parallel, and the second converter valve group branch is connected with the first converter valve group branch in parallel.
Specifically, the first converter valve group branch comprises a first converter valve group 1 and a first diode D1 which are connected in series, the cathode of a full-control device of the first converter valve group 1 is connected with the cathode of a first diode D1, the anode of a diode of the first converter valve group 1 is connected with the first end of a first capacitor C1 branch, the anode of the first diode D1 is connected with the second end of the first capacitor C1 branch, the gate of the full-control device of the first converter valve group 1 is connected with a pulse signal, and the first converter valve group 1 is controlled to be turned on or turned off by the pulse signal.
The anode of the diode of the first converter valve group 1 is connected with the anode of the direct current boosting and discharging loop; the anode of the first diode D1 is connected to the negative pole of the dc boost and discharge circuit.
Specifically, the second converter valve group branch comprises a second converter valve group 2 and a second diode D2 which are connected in series, the anode of the diode of the second converter valve group 2 is connected with the anode of a second diode D2, the cathode of the fully-controlled device of the second converter valve group 2 is connected with the anode of a first diode D1, the cathode of the second diode D2 is connected with the anode of the diode of the first converter valve group 1, the gate of the fully-controlled device of the second converter valve group 2 is connected with a pulse signal, and the first converter valve group is controlled to be turned on or turned off by the pulse signal.
The cathode of a full-control device of the second converter valve group 2 is connected with the cathode of the direct-current boosting and discharging loop; the cathode of the second diode D2 is connected to the anode of the dc boost and discharge circuit.
The first end of the first direct current reactance Ldc1 is respectively connected with the cathode of the fully controlled device of the first converter valve group 1 and the cathode of the first diode D1, the second end of the first direct current reactance Ldc1 is respectively connected with the first end of the second direct current reactance Ldc2 and the first end of the branch of the second capacitor C2, the second end of the second direct current reactance Ldc2 is respectively connected with the anode of the diode of the second converter valve group 2 and the anode of the second diode D2, and the second end of the branch of the second capacitor C2 is respectively connected with the cathode of the fully controlled device of the second converter valve group 2 and the anode of the first diode D1.
Specifically, the branch of the first capacitor C1, the first converter valve group 1, the first diode D1, the first direct current resistor Ldc1 and the branch of the second capacitor C2 form a BUCK voltage reducing circuit.
Specifically, the branch of the second capacitor C2, the branch of the second dc reactance Ldc2, the branch of the second converter valve group 2, the branch of the second diode D2 and the branch of the first capacitor C1 form a BOOST circuit.
The BUCK voltage reduction circuit is used for controlling output voltage; the BOOST circuit is used to control the output current.
The direct current boosting and discharging circuit comprises a rectifying circuit, and the rectifying circuit is used for converting alternating current of a three-phase power supply into direct current.
The experimental circuit of the embodiment can truly simulate the actual operation working condition of the converter valves, and the two groups of converter valves are tested simultaneously, so that the experimental circuit has the advantages of simplicity, easiness in realization and high testing efficiency.
Through the experimental circuit of the embodiment, a maximum continuous operation load test and a maximum temporary overload operation test of the converter valve can be performed.
The maximum continuous operation load test is a long-time operation test of rated voltage, rated current and switching frequency.
The maximum temporary overload test is the value of the current which is the overload current, for example 1.2 times the rated current of the converter valve.
During the experiment, the direct current voltage is firstly boosted and then reduced, so that the back-to-back effect of the direct current voltage is realized, namely, the power circulates in the BUCK voltage reduction circuit and the BOOST voltage boosting circuit, and the power is not absorbed or fed to the three-phase power supply.
The active power firstly passes through the BUCK voltage reduction circuit and then passes through the BOOST voltage boosting circuit to realize the internal circulation of the power. The DC boost and discharge circuit provides only DC voltage and energy supplement for the test circuit losses.
Referring to fig. 3, fig. 3 shows a control schematic block diagram of the current source converter valve equivalent power experiment system according to the embodiment of the present invention.
The current source converter valve equivalent power experiment system comprises the fully-controlled current source converter valve equivalent power experiment circuit, and further comprises a first PI (proportional integral) controller and a second PI controller.
The PI controller is a linear controller, which forms a control deviation from a given value and an actual output value, and linearly combines the proportion and integral of the deviation to form a control quantity to control a controlled object.
The first PI controller is used for driving a full-control device of the first converter valve group 1 to be switched on, switched off or switched on according to a voltage negative feedback signal on the branch of the second capacitor C2, so as to realize the output of the stable voltage of the BUCK voltage-reducing circuit.
The second PI controller is used for driving a fully-controlled device of the second converter valve group 2 to be switched on, switched off or switched on according to a current negative feedback signal on the second direct current reactance Ldc2, so as to realize the output of the stable current of the BOOST circuit.
The first PI controller is a voltage outer-loop PI controller, the second PI controller is a current inner-loop PI controller, and double closed-loop control, namely voltage closed-loop control and current closed-loop control, is realized.
Referring to fig. 4, fig. 4 shows a flow diagram of an equivalent power experiment method for a current source converter valve according to an embodiment of the present invention.
The equivalent power experiment method of the current source converter valve comprises the following steps:
performing circuit connection according to the equivalent power experiment system of the current source converter valve;
selecting an input voltage Vdc1, an output voltage Vdc2 and an output current Idc 2;
the duty ratio of the first converter valve group 1 is adjusted through a pulse signal by adopting voltage closed-loop control, and a stable voltage value Vdc2 is output;
and adopting current closed-loop control, regulating the duty ratio of the second converter valve group 2 through a pulse signal, and outputting a set current value Idc 2.
And the fully-controlled devices of the first converter valve group 1 and the second converter valve group 2 are switched on, switched off or switched on at a set switching frequency according to the pulse signals, and operate according to set time under the load of the output voltage Vdc2 and the output current Idc2, so that the maximum continuous operation load test of the first converter valve group 1 and the second converter valve group 2 is completed.
And the fully-controlled device of the second converter valve group 2 is switched on, switched off or switched on at the set switching frequency according to the pulse signal, and outputs 1.2 times of rated current value Idc3 of the first converter valve group 1 and the second converter valve group 2, so that the maximum temporary overload test of the first converter valve group 1 and the second converter valve group 2 is completed.
The first converter valve group 1 and the second converter valve group 2 are tested, and the voltage and the current of the first converter valve group 1 and the second converter valve group 2 in actual operation need to be simulated really.
Specifically, the output voltage Vdc2 and the output current Idc2 are rated voltages and rated current values of the first converter valve group 1 and the second converter valve group 2.
In an example, a fully-controlled current source converter with an alternating voltage of 10kV, a direct voltage of 8000V, and a current of 1000A is taken as an example, analysis is performed on an upper bridge arm converter valve group a of a phase a, and a parameter output voltage Vdc2 and an output current Idc2 which need to be set in an experiment are obtained.
Referring to fig. 5, fig. 5 is a schematic diagram illustrating a conducting interval of the a-phase upper bridge arm converter valve set a according to an embodiment of the present invention.
When the va is more than the vb and more than the vc (0-60 degrees) and the va is more than the vc and more than the vb (300-360 degrees), the phase A upper bridge arm valve bank a can be conducted, the forward voltages borne by the valve bank a are vac and vab respectively, the maximum value of the voltage is 14.14kV, the minimum value of the voltage is 12.24kV, and the average value of the voltage can be equivalent to 13.19 kV. Therefore, the input voltage Vdc1 adopts an equivalent direct current voltage of 13.19 kV.
The output voltage Vdc2 adopts an equivalent rated voltage of 8000V.
In a power frequency period (0-360 degrees), the A-phase upper bridge arm valve group a can be conducted only in the interval of (0-60 degrees) and (300-. Therefore, the output current Idc2 takes an equivalent value of 1/3 times the rated current, that is, 1000 × 1/3= 333A.
In the test process, the BUCK voltage reduction circuit works in a stable direct current voltage mode, and the output voltage Vdc2 is controlled to be 8000V of rated direct current voltage.
In the test process, the BOOST circuit works in a constant current mode, and the output current Idc2 is controlled to be 1/3 times of the rated current 1000A. The active power exchanged by the two converter valve groups can be effectively adjusted by changing the set value of the output current.
The equivalent rated voltage and the equivalent rated current of the converter valve in actual operation are obtained by analyzing and calculating the rated voltage and the rated current value of the converter valve group, and the actual operation condition of the converter valve can be truly simulated.
The testing method is simple in principle and easy to implement, and in the testing process, the maximum continuous operation load test and the maximum temporary overload operation test can be simultaneously carried out on the two groups of converter valve groups, so that the workload of circuit construction in the testing process is reduced.
Meanwhile, the two converter valve sets are tested at one time, so that the serious problems that the connection of the converter valve sets is repeatedly disconnected in the testing process, the connection recovery is easy to be wrong, the fault of the converter valve sets is caused and the like are avoided.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. The equivalent power experimental circuit of the current source converter valve is characterized by comprising a direct current boosting and discharging circuit, a first capacitor C1 branch circuit, a second capacitor C2 branch circuit, a first converter valve group branch circuit, a second converter valve group branch circuit, a first direct current reactance Ldc1 and a second direct current reactance Ldc 2;
the direct current boosting and discharging loop is connected with a three-phase power supply, and the branch of the first capacitor C1 is connected with the direct current boosting and discharging loop in series;
the first converter valve group branch is connected with the first capacitor C1 branch in parallel, and the second converter valve group branch is connected with the first converter valve group branch in parallel;
the first converter valve group branch comprises a first converter valve group and a first diode D1 which are connected in series;
the second converter valve group branch comprises a second converter valve group and a second diode D2 which are connected in series;
a first end of the first direct current reactance Ldc1 is respectively connected with a cathode of a fully-controlled device of the first converter valve group and a cathode of the first diode D1, and a second end of the first direct current reactance Ldc1 is respectively connected with a first end of the second direct current reactance Ldc2 and a first end of a branch of the second capacitor C2;
a second end of the second direct current reactance Ldc2 is respectively connected with an anode of a diode of the second converter valve group and an anode of the second diode D2, and a second end of a branch of the second capacitor C2 is respectively connected with a cathode of a fully-controlled device of the second converter valve group and an anode of the first diode D1.
2. The equivalent power experimental circuit of current source converter valve according to claim 1,
the cathode of a full-control device of the first converter valve group is connected with the cathode of the first diode D1, the anode of the diode of the first converter valve group is connected with the first end of the first capacitor C1 branch, and the anode of the first diode D1 is connected with the second end of the first capacitor C1 branch.
3. The equivalent power experimental circuit of the current source converter valve according to claim 2, wherein a gate electrode of a fully-controlled device of the first converter valve group is connected with a pulse signal, and the first converter valve group is controlled to be turned on or turned off by the pulse signal.
4. The current source converter valve equivalent power experimental circuit according to claim 2, wherein the anode of the diode of the first converter valve group is connected with the anode of the direct current boosting and discharging loop; the anode of the first diode D1 is connected to the negative pole of the dc boost and discharge circuit.
5. The equivalent power experimental circuit of current source converter valve according to claim 1,
the anode of the diode of the second converter valve group is connected with the anode of the second diode D2, the cathode of the fully-controlled device of the second converter valve group is connected with the anode of the first diode D1, and the cathode of the second diode D2 is connected with the anode of the diode of the first converter valve group.
6. The equivalent power experimental circuit of the current source converter valve according to claim 5, wherein a gate electrode of a fully-controlled device of the second converter valve group is connected with a pulse signal, and the first converter valve group is controlled to be turned on or turned off by the pulse signal.
7. The current source converter valve equivalent power experimental circuit according to claim 5, wherein a cathode of a fully-controlled device of the second converter valve group is connected with a cathode of the direct current boosting and discharging loop; the cathode of the second diode D2 is connected with the anode of the direct current boosting and discharging loop.
8. The current source converter valve equivalent power experimental circuit according to claim 1, wherein the first capacitor C1 branch, the first converter valve group, the first diode D1, the first direct current resistance Ldc1 branch and the second capacitor C2 branch form a BUCK voltage reduction circuit, and the BUCK voltage reduction circuit is used for controlling an output voltage.
9. The equivalent power experimental circuit of current source converter valve according to claim 1, wherein said second capacitor C2 branch, said second dc reactance Ldc2, said second converter valve group, said second diode D2 and said first capacitor C1 branch constitute a BOOST voltage circuit, said BOOST voltage circuit is used for controlling output current.
10. The current source converter valve equivalent power experimental circuit according to any one of claims 1 to 9, wherein the dc boost and discharge circuit comprises a rectifying circuit for converting the ac power of the three-phase power supply into dc power.
11. A current source converter valve equivalent power experiment system, comprising the current source converter valve equivalent power experiment circuit of any one of claims 1 to 10, the experiment system further comprising a first PI controller and a second PI controller;
the first PI controller is used for driving a fully-controlled device of the first converter valve group to be switched on, switched off or switched on according to a voltage negative feedback signal on a branch circuit of the second capacitor C2, so that the stable voltage output of the BUCK voltage reduction circuit is realized;
and the second PI controller is used for driving a fully-controlled device of the second converter valve group to be switched on, switched off or switched on according to a current negative feedback signal on the second direct current reactance Ldc2, so that the output of the stable current of the BOOST booster circuit is realized.
12. The equivalent power experiment method for the current source converter valve is characterized by comprising the following steps of:
the current source converter valve equivalent power experimental system of claim 11 is in circuit connection;
selecting an input voltage Vdc1, an output voltage Vdc2 and an output current Idc 2;
the duty ratio of the first converter valve group is adjusted through a pulse signal by adopting voltage closed-loop control, and a stable voltage value Vdc2 is output;
the current closed-loop control is adopted, the duty ratio of the second converter valve group is adjusted through a pulse signal, and a set current value Idc2 is output;
and the fully-controlled devices of the first converter valve group and the second converter valve group are switched on, switched off or switched on at a set switching frequency according to the pulse signals, and run according to set time under the loads of the output voltage Vdc2 and the output current Idc2, so that the maximum continuous running load test of the first converter valve group and the second converter valve group is completed.
13. The equivalent power experimental method for the current source converter valve as claimed in claim 12, further comprising the steps of:
and the fully-controlled device of the second converter valve group is switched on, switched off or switched on at the set switching frequency according to the pulse signal, and outputs 1.2 times of rated current values Idc3 of the first converter valve group and the second converter valve group, so that the maximum temporary overload test of the first converter valve group and the second converter valve group is completed.
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