CN111579981B - Circuit and method for simulating switching-on and switching-off voltage of converter valve - Google Patents
Circuit and method for simulating switching-on and switching-off voltage of converter valve Download PDFInfo
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- CN111579981B CN111579981B CN202010507794.6A CN202010507794A CN111579981B CN 111579981 B CN111579981 B CN 111579981B CN 202010507794 A CN202010507794 A CN 202010507794A CN 111579981 B CN111579981 B CN 111579981B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a circuit and a method for simulating the turn-on and turn-off voltage of a converter valve, wherein the circuit comprises: the circuit comprises a thyristor, an inductor, a switch component, a first capacitor and a second capacitor, wherein the anode of the thyristor is externally connected with the anode of a direct-current power supply; the cathode of the thyristor is connected with one end of an inductor, and the other end of the inductor is respectively connected with one end of a switch component and one end of a second capacitor; the other end of the switch assembly is connected with one end of the first capacitor, and the switch assembly is used for controlling the first capacitor to be connected to or quit the circuit for simulating the on-off voltage of the converter valve; the other end of the first capacitor and the other end of the second capacitor are connected with the negative electrode of the direct-current power supply; the two ends of the second capacitor are externally connected with a valve test article to be tested. The invention can meet the output requirement that the on-voltage is different from the off-voltage when the simulation converter valve engineering actually operates, has simple circuit structure and lower cost, and is beneficial to the research on the on-off characteristics of the valve and the performance test and the optimized model selection of each component in the valve.
Description
Technical Field
The invention relates to the field of operation tests of extra-high voltage converter valves, in particular to a circuit and a method for simulating the turn-on and turn-off voltage of a converter valve.
Background
The core device of the modern high-power electronic device is a single-direction and two-direction extra-high voltage converter valve, the extra-high voltage converter valve utilizes the switching characteristic of an internal thyristor to complete the function of serving as a high-voltage switch, and the extra-high voltage converter valve becomes a power electronic device with the widest application range. Technical indexes and technical levels of the extra-high voltage converter valve determine technical indexes and levels of direct current engineering to a great extent, so that the extra-high voltage converter valve needs to be subjected to electrical performance test.
In order to verify the operation performance of the extra-high voltage converter valve, voltage waveforms in engineering practice need to be simulated, and aiming at the test of the opening and closing characteristics of the extra-high voltage converter valve, the key point is to construct the voltage when the valve is opened or closed. The main test methods at present are synthetic full-working-condition test methods, and can be further divided into an oscillation boosting and direct-current source composite test method, a direct boosting and direct-current source composite test method and an oscillation boosting and alternating-current source composite test method. The switching-on voltage of the extra-high voltage converter valve in the actual operation of the project is different from the switching-off voltage, but the test device utilized by the existing synthetic all-condition test method can only output the forward and reverse voltages with the same magnitude, and can not meet the output requirement that the switching-on voltage of the extra-high voltage converter valve is different from the switching-off voltage, namely the voltage of the extra-high voltage converter valve in the switching-on or switching-off process can not be simulated, and further the switching-on and switching-off characteristics of a valve test article under the operation condition of the project can not be tested.
Disclosure of Invention
Therefore, the invention aims to overcome the defects that the test device in the prior art cannot simulate the voltage of the extra-high voltage converter valve during the on-off process, and further cannot test the on-off characteristics of a valve test product under the engineering operation condition, thereby providing the circuit and the method for simulating the on-off voltage of the converter valve.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a circuit for simulating a turn-on/turn-off voltage of a converter valve, including: the direct current power supply comprises a thyristor, an inductor, a switch component, a first capacitor and a second capacitor, wherein the anode of the thyristor is externally connected with the anode of the direct current power supply; the cathode of the thyristor is connected with one end of the inductor, and the other end of the inductor is respectively connected with one end of the switch component and one end of the second capacitor; the other end of the switch assembly is connected with one end of the first capacitor, and the switch assembly is used for controlling the first capacitor to be connected to or disconnected from the circuit for switching on and off the voltage of the analog converter valve; the other end of the first capacitor and the other end of the second capacitor are connected with the negative electrode of the direct-current power supply; and two ends of the second capacitor are externally connected with a valve test article to be tested.
In one embodiment, the switch assembly includes: the first switch assembly is connected with the second switch assembly in series.
In one embodiment, the first and second switch assemblies each comprise: one or more press-fitting units, the press-fitting units comprising: the IGBT device in the first switch assembly is opposite to the IGBT device in conduction current direction in the second switch assembly.
In one embodiment, when the press-fitting units are plural, the press-fitting units are connected in series.
In a second aspect, an embodiment of the present invention provides a method for simulating a turn-on/turn-off voltage of a converter valve, which is applied to a circuit for simulating a turn-on/turn-off voltage of a converter valve according to the first aspect of the embodiment of the present invention, and includes: connecting a valve sample to be tested to the circuit for simulating the switching-on and switching-off voltage of the converter valve; triggering the thyristor to be switched on, controlling the switch assembly to switch the first capacitor into a circuit simulating the switching-on and switching-off voltage of the converter valve, and triggering the thyristor to be switched off when an external direct-current power supply charges the first capacitor and the second capacitor to the preset switching-on voltage of the valve sample to be tested; the opening process of the valve test article to be tested is as follows: controlling the switch assembly to act, triggering the valve test article to be tested to be opened, and enabling the first capacitor and the second capacitor to discharge to the valve test article to be tested simultaneously; the switching-off process of the valve test article to be tested comprises the following steps: and controlling the time for the first capacitor to exit the circuit for simulating the turn-on and turn-off voltage of the converter valve through the switch assembly, so that the valve test article to be tested is triggered to be turned off when the second capacitor is reversely charged by the valve test article to be tested to reach the preset turn-off voltage of the valve test article to be tested.
In one embodiment, the method further comprises: and when the valve test article to be tested is turned off, the first capacitor and the second capacitor are restored to the initial voltage level by controlling the switch assembly.
The technical scheme of the invention has the following advantages:
according to the circuit for simulating the turn-on and turn-off voltage of the converter valve, the thyristor, the inductor, the switch component, the first capacitor and the second capacitor are utilized to construct the circuit for simulating the turn-on and turn-off voltage of the converter valve, the time for the first capacitor to be connected into or disconnected from the circuit for simulating the turn-on and turn-off voltage of the converter valve is further controlled by controlling the time sequence of the switch component, so that the turn-on or turn-off voltage of the converter valve is simulated, the turn-on voltage is different from the turn-off voltage, and the output requirement that the turn-on voltage of the converter valve is different from the turn-off voltage is further met. The circuit for simulating the switching-on and switching-off voltage of the converter valve is simple in structure and low in cost, can simulate the switching-on and switching-off process of actual operation of a valve project under test conditions, generates the switching-on and switching-off voltage during engineering operation at two ends of the converter valve, can meet the requirements of the switching-on and switching-off voltage of a rectifying side and an inverting side, and has important significance for research on the switching-on and switching-off characteristics of the valve and performance test and optimization selection of various components in the valve.
According to the method for simulating the turn-on and turn-off voltage of the converter valve, the valve sample to be tested is connected into the circuit for simulating the turn-on and turn-off voltage of the converter valve, the time sequence of the switch assembly is controlled, and the time for connecting or quitting the circuit for simulating the turn-on and turn-off voltage of the converter valve by the first capacitor is further controlled, so that the turn-on or turn-off voltage of the converter valve is simulated, and the turn-on voltage is different from the turn-off voltage. And further the output requirement that the opening voltage of the converter valve is different from the turn-off voltage is met. The circuit for simulating the switching-on and switching-off voltage of the converter valve, which is utilized by the test power supply generation method, has the advantages of simple structure and low cost, can simulate the switching-on and switching-off process of actual operation of a valve project under test conditions, generate the switching-on and switching-off voltage during engineering operation at two ends of the converter valve, can meet the switching-on and switching-off voltage requirements of a rectification side and an inversion side, and has important significance for research on the switching-on and switching-off characteristics of the valve and performance test and optimization selection of various components in the valve.
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 other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a circuit diagram of a specific example of a circuit for simulating the turn-on and turn-off voltage of a converter valve in the embodiment of the invention;
FIG. 2 is a schematic diagram of a multistage series connection structure of a press-fitting unit of a circuit for simulating the turn-on and turn-off voltage of a converter valve in the embodiment of the invention;
FIG. 3 is a circuit diagram of another specific example of a circuit for simulating the turn-on and turn-off voltages of the converter valves according to the embodiment of the invention;
fig. 4 is a timing diagram of power control of a method for simulating the turn-on and turn-off voltages of a converter valve according to an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the invention provides a circuit for simulating the turn-on and turn-off voltage of a converter valve, as shown in fig. 1, comprising: the circuit comprises a thyristor T1, an inductor L, a switch component K, a first capacitor C1 and a second capacitor C2, wherein the anode of the thyristor T1 is externally connected with the anode of a direct-current power supply DC; the cathode of the thyristor T1 is connected with one end of an inductor L, and the other end of the inductor L is respectively connected with one end of a switch component K and one end of a second capacitor C2; the other end of the switch component K is connected with one end of a first capacitor C1, and the switch component K is used for controlling the first capacitor C1 to be connected to or quit a circuit for simulating the on-off voltage of the converter valve; the other end of the first capacitor C1 and the other end of the second capacitor C2 are connected with the negative electrode of the direct-current power supply DC; the two ends of the second capacitor C2 are externally connected with the valve test article P to be tested.
According to the circuit for simulating the turn-on and turn-off voltage of the converter valve, the thyristor, the inductor, the switch component, the first capacitor and the second capacitor are utilized to construct the circuit for simulating the turn-on and turn-off voltage of the converter valve, the time for the first capacitor to be connected into or disconnected from the circuit for simulating the turn-on and turn-off voltage of the converter valve is further controlled by controlling the time sequence of the switch component, so that the turn-on or turn-off voltage of the converter valve is simulated, the turn-on voltage is different from the turn-off voltage, and the output requirement that the turn-on voltage of the converter valve is different from the turn-off voltage is further met. The circuit for simulating the switching-on and switching-off voltage of the converter valve has a simple structure and low cost, can simulate the switching-on and switching-off process of actual operation of a valve project under test conditions, generates switching-on and switching-off voltages during engineering operation at two ends of the converter valve, can meet the switching-on and switching-off voltage requirements of a rectifying side and an inverting side, and has important significance for research on the switching-on and switching-off characteristics of the valve and performance test and optimization selection of various components in the valve.
In the embodiment of the present invention, as shown in fig. 2, the switch module K includes: the first switch component K1 and the second switch component K2, the first switch component K1 is connected with the second switch component K2 in series. Wherein the first switch assembly K1 and the second switch assembly K2 each comprise: and each press-fitting unit M consists of an IGBT device and a diode connected with the IGBT device in an anti-parallel mode, and the conducting current directions of the IGBT devices in the first switch assembly K1 and the IGBT devices in the second switch assembly K2 are opposite. When the press-fitting units M are plural, the press-fitting units M are connected in series. When the valve sample P to be tested requires different levels of on or off voltages, the number of stages of the press-fitting unit M can be increased or decreased. The series connection stages of the parallel units of the IGBT and the diode are adjusted to meet the test requirements of different voltage stages, it should be noted that, in the embodiment shown in fig. 2, an example is given by taking a plurality of press-mounting units M in the first switch module K1 and the second switch module K2 as an example, in practical application, only one press-mounting unit M in the first switch module K1 and the second switch module K2 may be provided, and the present invention is not limited thereto.
In the embodiment of the present invention, as shown in fig. 3, it is specifically described that the first switch module K1 and the second switch module K2 both include one press-fitting unit M. The circuit for simulating the turn-on and turn-off voltage of the converter valve comprises: the direct-current power supply comprises a thyristor T1, an inductor L, a first press-mounting unit M1, a second press-mounting unit M2, a first capacitor C1 and a second capacitor C2, wherein the anode of the thyristor T1 is externally connected with the anode of a direct-current power supply DC; the cathode of the thyristor T1 is connected with one end of an inductor L, and the other end of the inductor L is respectively connected with one end of the first press-mounting unit M1 and one end of the second capacitor C2; the other end of the first press-fitting unit M1 is connected with one end of the second press-fitting unit M2, and the other end of the second press-fitting unit M2 is connected with one end of the first capacitor C1; the other end of the first capacitor C1 and the other end of the second capacitor C2 are connected with the negative electrode of the direct-current power supply DC; the two ends of the second capacitor C2 are externally connected with the valve test article P to be tested.
The first press-fitting unit M1 includes: the first IGBT device G1 and the diode D1 connected with the first IGBT device G1 in an anti-parallel mode, and the second press-mounting unit M2 comprises: the second IGBT device G2 and the diode D2 are connected in anti-parallel with the second IGBT device G2, and the conducting current directions of the first IGBT device G1 in the first press-fitting unit M1 and the second IGBT device G2 in the second press-fitting unit M2 are opposite. The first press-mounting unit M1 is connected in series with the second press-mounting unit M2 and is used for controlling the first capacitor C1 to be connected to or disconnected from a circuit for simulating the on-off voltage of the converter valve.
The embodiment of the invention also provides a method for simulating the turn-on and turn-off voltage of the converter valve, which is applied to a circuit for simulating the turn-on and turn-off voltage of the converter valve shown in figure 3 and comprises the following time sequence steps:
step S1: and connecting a valve sample P to be tested into a circuit for simulating the switching-on and switching-off voltage of the converter valve.
Step S2: the thyristor T1 is triggered to be switched on, the second IGBT device G2 is controlled to be switched on, the first capacitor C1 is connected to a circuit simulating the switching-on and switching-off voltage of the converter valve, and the thyristor T1 and the second IGBT device G2 are triggered to be switched off when an external direct-current power supply DC charges the first capacitor C1 and the second capacitor C2 to the preset switching-on voltage of the valve sample P to be tested.
Step S3: opening process of the valve sample P to be tested: controlling the first IGBT device G1 to be conducted, triggering a valve sample P to be tested to be turned on, and enabling the first capacitor C1 and the second capacitor C2 to discharge to the valve sample P to be tested simultaneously;
step S4: the shut-off process of the valve sample P to be tested: by controlling the turn-off time of the first IGBT device G1, the first capacitor C1 is withdrawn from the circuit simulating the turn-on and turn-off voltage of the converter valve, so that the valve sample P to be tested is triggered to turn off when the second capacitor C2 is reversely charged by the valve sample P to be tested to the preset turn-off voltage of the valve sample P to be tested.
In the embodiment of the invention, two ends of a valve test article P to be tested are connected with two ends of a second capacitor C2, and the valve test article P to be tested is connected to a circuit simulating the turn-on and turn-off voltage of the converter valve.
And setting the switching-on voltage of the valve sample P to be tested as U1 and the switching-off voltage as U2. The circuit operation sequence is shown in fig. 4, and the power supply output voltage comprises a positive voltage of the first capacitor C1 and a negative voltage of the second capacitor C2. t is t0The moment begins for the precharge process: the thyristor T1 and the second IGBT device G2 are switched on, the first capacitor C1 is controlled to be connected to a circuit simulating the switching-on and switching-off voltage of the converter valve, the inductor L, the first capacitor C1 and the second capacitor C2 jointly determine charging time, the external direct current power supply DC charges the first capacitor C1 and the second capacitor C2 to the preset switching-on voltage U1 of the valve sample P to be tested, and the thyristor T1 and the second IGBT device G2 are switched off after charging is completed. In other embodiments, the direct current power supplies DC with different voltage levels are selected according to the switching-on voltage level of the valve test article P to be tested.
t1At the moment, the valve sample P to be tested and the first IGBT device G1 are simultaneously switched on, the first capacitor C1 and the second capacitor C2 are controlled to simultaneously discharge to the valve sample P to be tested, and the pre-charging voltage of the first capacitor C1 and the second capacitor C2 is U1, which is just the switching-on time voltage of the valve sample P to be tested, so that the switching-on process of the valve sample P to be tested is equivalent.
After the valve test article P to be tested and the first IGBT device G1 are turned on, since most of the elements in the valve test article P to be tested are inductive loads, the first capacitor C1 and the second capacitor C2 discharge to the inductive loads in a resonant mode, when the test article current of the valve test article P to be tested reaches a peak value in the resonant state, the capacitor voltage drops of the first capacitor C1 and the second capacitor C2 are zero, then the current in the valve test article P to be tested gradually decreases, and the first capacitor C1 and the second capacitor C2 start to receive reverse charging of the valve test article P to be tested.
Controlling the turn-off time of the first IGBT device G1 to enable the first capacitor C1 to exit the circuit, continuously charging the second capacitor C2 by the valve test article P to be tested, reversely charging the second capacitor C2 by the valve test article P to be tested to the preset turn-off voltage of the valve test article P to be tested, and gradually reducing the test article current of the valve test article P to be tested to zero when t is2At any moment, the valve sample P to be tested is turned off, and the voltage of the second capacitor C2 is just the turn-off voltage of the valve sample P to be tested, so that the turn-off process of the valve sample P to be tested is equivalent.
In the switching-on process, the first capacitor C1 and the second capacitor C2 discharge to the valve sample P to be tested at the same time, the voltage of the valve sample at the switching-on time is U1, and in the switching-off process, the voltage of the second capacitor C2 is just the switching-off voltage U2 of the sample. C1+ C2 is not equal to C2, so that the turn-on voltage U1 is not equal to the turn-off voltage U2, and the output requirement that the turn-on voltage of the converter valve is different from the turn-off voltage is met.
In the embodiment of the invention, after the valve sample P to be tested is turned off, the voltages of the first capacitor C1 and the second capacitor C2 are restored to the initial voltage levels by controlling the timing sequence of the switch component K (i.e., controlling the on-off of the first IGBT device G1 and the second IGBT device G2), so as to prepare for the next period.
The method for simulating the turn-on and turn-off voltage of the converter valve provided by the invention utilizes the built circuit for simulating the turn-on and turn-off voltage of the converter valve, and further controls the time for the first capacitor to be connected with or quit the circuit for simulating the turn-on and turn-off voltage of the converter valve by controlling the time sequence of the switch assembly. The circuit for simulating the switching-on and switching-off voltage of the converter valve, which is utilized by the test power supply generation method, has the advantages of simple structure and low cost, can simulate the switching-on and switching-off process of actual operation of a valve project under test conditions, generate the switching-on and switching-off voltage during engineering operation at two ends of the converter valve, can meet the switching-on and switching-off voltage requirements of a rectification side and an inversion side, and has important significance for research on the switching-on and switching-off characteristics of the valve and performance test and optimization selection of various components in the valve.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (4)
1. A circuit for simulating the turn-on and turn-off voltage of a converter valve is characterized by comprising the following components: a thyristor, an inductor, a switch component, a first capacitor and a second capacitor, wherein,
the anode of the thyristor is externally connected with the anode of a direct current power supply;
the cathode of the thyristor is connected with one end of the inductor, and the other end of the inductor is respectively connected with one end of the switch component and one end of the second capacitor;
the other end of the switch assembly is connected with one end of the first capacitor, and the switch assembly is used for controlling the first capacitor to be connected to or disconnected from the circuit for switching on and off the voltage of the analog converter valve;
the other end of the first capacitor and the other end of the second capacitor are connected with the negative electrode of the direct-current power supply;
two ends of the second capacitor are externally connected with a valve test article to be tested;
the switch assembly includes: the first switch assembly is connected with the second switch assembly in series;
the first and second switch assemblies each include: one or more press-fitting units, the press-fitting units comprising: the IGBT device in the first switch assembly is opposite to the IGBT device in the second switch assembly in conduction current direction.
2. The circuit for simulating turn-on and turn-off voltages of converter valves according to claim 1, wherein when the press-fitting units are multiple, the press-fitting units are connected in series.
3. A method for simulating the turn-on and turn-off voltage of a converter valve, which is applied to a circuit for simulating the turn-on and turn-off voltage of the converter valve according to any one of claims 1-2, and is characterized by comprising the following steps:
connecting a valve sample to be tested to the circuit for simulating the switching-on and switching-off voltage of the converter valve;
triggering the thyristor to be switched on, controlling the switch assembly to switch the first capacitor into the circuit simulating the switching-on and switching-off voltage of the converter valve, and triggering the thyristor to be switched off when an external direct-current power supply charges the first capacitor and the second capacitor to the preset switching-on voltage of the valve sample to be tested;
the opening process of the valve test article to be tested is as follows: controlling the switch assembly to act, triggering the valve test article to be tested to be opened, and enabling the first capacitor and the second capacitor to discharge to the valve test article to be tested simultaneously;
the switching-off process of the valve test article to be tested comprises the following steps: and controlling the time for the first capacitor to exit the circuit for simulating the turn-on and turn-off voltage of the converter valve through the switch assembly, so that the valve test article to be tested is triggered to turn off when the second capacitor is reversely charged by the valve test article to be tested to the preset turn-off voltage of the valve test article to be tested.
4. The method for simulating the on-off voltage of the converter valve according to claim 3, further comprising: and when the valve test article to be tested is turned off, the first capacitor and the second capacitor are restored to the initial voltage level by controlling the switch assembly.
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