Direct connection prevention control method and device for high-voltage static start frequency converter

Abstract

The invention discloses a direct connection prevention control method and device for a high-voltage static start frequency converter, and relates to the technical field of power electronic application, and the control method comprises the following steps: detecting electric signals of an input side and an output side of the high-voltage static start frequency converter in real time; based on positive and negative sequence separation, performing phase locking on the input-side electric signal to obtain an input-side positive sequence variable; the turn-off condition of the rectifier bridge integrated gate commutated thyristor is judged by analyzing the numerical relationship of the positive sequence alternating voltage at the input side; based on positive and negative sequence separation, performing phase locking on the output-side electric signal to obtain an output-side positive sequence variable; and the turn-off condition of the inverter bridge integrated gate commutated thyristor is judged by analyzing the numerical relationship of the positive sequence AC voltage at the output side. By adopting the integrated gate commutated thyristor power device and thyristor hybrid structure, the problem of bridge arm direct connection of the high-voltage static starting frequency converter under the abnormal power supply condition in the prior art is solved, the starting success rate is improved, and the overall reliability of the system is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics applications, and in particular to a method and device for preventing direct-through control of a high-voltage static starting frequency converter. Background Art

[0002] Current Source Inverter (CSI) is an important branch of inverter technology and has broad prospects in industrial applications. The development background of inverters stems from the rapid popularization of industrial automation, especially in the field of motor speed control. Traditional motor speed control relies on mechanical methods, such as using gearboxes, clutches, variable speed belts, etc. Although these methods are effective, they have obvious disadvantages: not only are they time-consuming and labor-intensive, but the efficiency of mechanical transmission is low, resulting in a large amount of mechanical loss. In addition, with the development of industrial equipment towards high efficiency and intelligence, traditional mechanical speed control methods can no longer meet the needs of modern industry for high precision, high response speed and energy consumption optimization.

[0003] The current-source inverter converts the industrial frequency AC power into a constant DC power supply through the rectifier circuit, and then inverts the DC power into variable frequency AC power through the inverter part to control the speed of the motor. Its core features are constant input current and adjustable output voltage and frequency. The current-source inverter has good overload capacity and is suitable for high-power and long-distance transmission occasions, especially for scenarios that require high-precision speed control.

[0004] In current-source inverters, the use of thyristors is crucial. Thyristors are semi-controlled switching devices whose conduction conditions include forward anode voltage and forward gate current. In other words, the gate current of the thyristor only works at startup. Once the thyristor is turned on, even if the gate signal is removed, as long as the anode current is maintained above a certain level, the thyristor will remain in the on state until the anode current drops below its holding current. It is precisely because of this "one-way conduction" characteristic that the thyristor can only be turned on by controlling its conduction and cannot be actively turned off, and is a semi-controlled device.

[0005] However, this characteristic of thyristors also brings potential problems to current-type inverters. For example, when the power quality of the power grid fluctuates, especially when the power supply has voltage drops or flickers, the thyristors may not be able to shut down normally, resulting in the occurrence of bridge arm shoot-through. This will not only threaten the operating stability of the equipment, but in serious cases, it will also cause equipment damage or safety hazards. Summary of the invention

[0006] Based on this, it is necessary to provide a high-voltage static starting inverter anti-straight-through control method and device to address the above technical problems.

[0007] In a first aspect, the present invention provides a high-voltage static starting inverter anti-shoot-through control method, the control method comprising the following steps: S1, real-time detection of electrical signals on the input and output sides of the high-voltage static starting inverter; S2, based on positive and negative sequence separation, the input side electrical signal is phase-locked to obtain the input side positive sequence variable, and then the input side positive sequence variable is converted into the input side positive sequence AC voltage by inverse transformation; S3, by analyzing the numerical relationship of the positive sequence AC voltage on the input side, determining the shutdown condition of the rectifier bridge integrated gate commutation thyristor, and executing the shutdown of the rectifier bridge power device and the rectifier bridge thyristor; S4, based on positive and negative sequence separation, the output side electrical signal is phase-locked to obtain the output side positive sequence variable, and then the output side positive sequence variable is converted into the output side positive sequence AC voltage by inverse transformation; S5. By analyzing the numerical relationship of the positive sequence AC voltage on the output side, the shutdown condition of the inverter bridge integrated gate commutated thyristor is determined, and the inverter bridge power device and the inverter bridge thyristor are shut down.

[0008] Furthermore, real-time detection of electrical signals at the input and output sides of the high-voltage static starting inverter includes the following steps: S11, detecting the input side electrical signal of the high-voltage static starting inverter in real time, wherein the input side electrical signal includes an input side three-phase voltage signal and an input side current signal; S12, detecting the output side electrical signal of the high-voltage static starting inverter in real time, wherein the output side electrical signal includes an output side three-phase voltage signal and an output side current signal.

[0009] Furthermore, based on the positive and negative sequence separation, the input side electrical signal is phase-locked to obtain the input side positive sequence variable, and then the input side positive sequence variable is converted into the input side positive sequence AC voltage by inverse transformation, which includes the following steps: S21, separating the positive and negative sequences of the three-phase voltage signal on the input side, selecting the separated positive sequence voltage for phase locking, and obtaining the input side positive sequence variable, wherein the input side positive sequence variable includes the input voltage positive sequence angle, the input voltage d-axis positive sequence component, and the input voltage q-axis positive sequence component; S22, performing inverse transformation operations on the input voltage positive-sequence angle, the input voltage d-axis positive-sequence component and the input voltage q-axis positive-sequence component in sequence to convert them into input-side positive-sequence AC voltage, and the input-side positive-sequence AC voltage includes a first input positive-sequence AC voltage, a second input positive-sequence AC voltage and a third input positive-sequence AC voltage.

[0010] Further, by analyzing the numerical relationship of the positive sequence AC voltage on the input side, determining the shut-down condition of the rectifier bridge integrated gate commutation thyristor, and executing the shut-down of the rectifier bridge power device and the rectifier bridge thyristor includes the following steps: S31, comparing the first input positive sequence AC voltage, the second input positive sequence AC voltage and the third input positive sequence AC voltage, if the first input positive sequence AC voltage is less than the second input positive sequence AC voltage, and the first input positive sequence AC voltage is less than the third input positive sequence AC voltage, then the turn-off condition of the rectifier bridge integrated gate commutated thyristor GA3 is met, and the rectifier bridge integrated gate commutated thyristor GA3 is turned off; S32, if the second input positive sequence AC voltage is less than the first input positive sequence AC voltage, and the second input positive sequence AC voltage is less than the third input positive sequence AC voltage, the turn-off condition of the rectifier bridge integrated gate commutated thyristor GB3 is met, and the rectifier bridge integrated gate commutated thyristor GB3 is turned off; S33. If the third input positive-sequence AC voltage is less than the first input positive-sequence AC voltage, and the third input positive-sequence AC voltage is less than the second input positive-sequence AC voltage, the turn-off condition of the rectifier bridge integrated gate-commutated thyristor GC3 is met, and the rectifier bridge integrated gate-commutated thyristor GC3 is turned off.

[0011] Further, the rectifier bridge power device includes a rectifier bridge integrated gate commutated thyristor GA3, a rectifier bridge integrated gate commutated thyristor GB3, and a rectifier bridge integrated gate commutated thyristor GC3; The rectifier bridge thyristors include thyristor GA1, thyristor GA2, thyristor GA4, thyristor GA5, thyristor GA6, thyristor GB1, thyristor GB2, thyristor GB4, thyristor GB5, thyristor GB6, thyristor GC1, thyristor GC2, thyristor GC4, thyristor GC5 and thyristor GC6.

[0012] Furthermore, based on the positive and negative sequence separation, the output side electrical signal is phase-locked to obtain the output side positive sequence variable, and then the output side positive sequence variable is converted into the output side positive sequence AC voltage by inverse transformation, which includes the following steps: S41, separating the positive and negative sequences of the three-phase voltage signal at the output side, selecting the separated positive sequence voltage for phase locking, and obtaining the output side positive sequence variable, wherein the output side positive sequence variable includes the output voltage positive sequence angle, the output voltage d-axis positive sequence component, and the output voltage q-axis positive sequence component; S42, performing inverse transformation operations on the output voltage positive-sequence angle, the output voltage d-axis positive-sequence component and the output voltage q-axis positive-sequence component in sequence to convert them into an output side positive-sequence AC voltage, and the output side positive-sequence AC voltage includes a first output positive-sequence AC voltage, a second output positive-sequence AC voltage and a third output positive-sequence AC voltage.

[0013] Further, by analyzing the numerical relationship of the positive sequence AC voltage on the output side, determining the turn-off condition of the inverter bridge integrated gate commutated thyristor, and executing the turn-off of the inverter bridge power device and the inverter bridge thyristor includes the following steps: S51, comparing the first output positive sequence AC voltage, the second output positive sequence AC voltage and the third output positive sequence AC voltage, if the first output positive sequence AC voltage is less than the second output positive sequence AC voltage, and the first output positive sequence AC voltage is less than the third output positive sequence AC voltage, then the turn-off condition of the inverter bridge integrated gate commutated thyristor GU3 is met, and the inverter bridge integrated gate commutated thyristor GU3 is turned off; S52: If the second output positive-sequence AC voltage is less than the first output positive-sequence AC voltage, and the second output positive-sequence AC voltage is less than the third output positive-sequence AC voltage, the turn-off condition of the inverter bridge integrated gate-commutated thyristor GV3 is met, and the inverter bridge integrated gate-commutated thyristor GV3 is turned off; S53. If the third output positive-sequence AC voltage is less than the first output positive-sequence AC voltage, and the third output positive-sequence AC voltage is less than the second output positive-sequence AC voltage, the turn-off condition of the inverter bridge integrated gate-commutated thyristor GW3 is met, and the inverter bridge integrated gate-commutated thyristor GW3 is turned off.

[0014] Further, the inverter bridge power device includes an inverter bridge integrated gate commutated thyristor GU3, an inverter bridge integrated gate commutated thyristor GV3, and an inverter bridge integrated gate commutated thyristor GW3; The inverter bridge thyristors include thyristor GU1, thyristor GU2, thyristor GU4, thyristor GU5, thyristor GU6, thyristor GV1, thyristor GV2, thyristor GV4, thyristor GV5, thyristor GV6, thyristor GW1, thyristor GW2, thyristor GW4, thyristor GW5 and thyristor GW6.

[0015] In a second aspect, the present invention further provides a high-voltage static starting inverter anti-straight-through control device, the device comprising a three-phase rectifier bridge, a DC module, a three-phase inverter bridge and a high-voltage static starting inverter control system; Among them, the three-phase rectifier bridge is used to integrate the integrated gate-commutated thyristor and several thyristors to realize the input of DC power by rectifying the input AC power; DC module, used to smooth the rectified DC voltage and reduce current fluctuations; A three-phase inverter bridge is used to integrate the integrated gate-commutated thyristor and several thyristors, and output AC power of different frequencies and amplitudes by adjusting the operating frequency; The high-voltage static starting inverter control system is used to control the opening and closing of the devices in the three-phase rectifier bridge and the three-phase inverter bridge through two-way optical fiber communication, and at the same time receive the status information and fault information of the three-phase rectifier bridge and the three-phase inverter bridge.

[0016] Further, the high voltage static starting inverter control system includes a phase lock module and an inverse transformation module; Among them, the phase locking module is used to process the three-phase AC voltage signal to obtain the phase locking angle; The inverse transformation module is used to perform coordinate transformation on the positive-sequence dq-axis positive-sequence component of the positive sequence and output a three-phase positive-sequence AC voltage.

[0017] The beneficial effects of the present invention are as follows: by adopting an integrated gate-commutated thyristor power device and a thyristor hybrid structure, the low on-state voltage drop and high blocking voltage characteristics of the thyristor and the fast switching capability of the transistor are combined, and the advantages of low loss, fast switching speed, large capacity density, and high reliability are achieved; the problem of bridge arm direct-passing of the high-voltage static starting inverter under abnormal power supply conditions in the prior art solution is solved, and the topology structure has the advantages of being simple and reliable, thereby improving the startup success rate and enhancing the overall reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 is a flow chart of a high-voltage static starting inverter anti-shoot-through control method according to an embodiment of the present invention; Figure 2 It is one of the logic execution diagrams of a high-voltage static starting inverter anti-shoot-through control method according to an embodiment of the present invention; Figure 3 This is the second logic execution diagram of a high-voltage static starting inverter anti-shoot-through control method according to an embodiment of the present invention; Figure 4 1 is a structural block diagram of a high-voltage static starting inverter anti-through control device according to an embodiment of the present invention; Figure 5 It is a principle block diagram of a high-voltage static starting inverter anti-straight-through control device according to an embodiment of the present invention; Figure 6 It is a principle block diagram of a three-phase rectifier bridge in a high-voltage static starting inverter anti-shoot-through control device according to an embodiment of the present invention; Figure 7 It is a principle block diagram of a three-phase inverter in a high-voltage static starting inverter anti-shoot-through control device according to an embodiment of the present invention; Figure 8 The present invention is a block diagram of a voltage detection control device for preventing direct-through of a high-voltage static starting frequency converter according to an embodiment of the present invention.

[0019] Figure numbers: 1. Three-phase rectifier bridge; 2. DC module; 3. Three-phase inverter bridge; 4. High-voltage static starting inverter control system. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] See also Figure 1-Figure 3 , a high-voltage static starting inverter anti-shoot-through control method is provided, the control method comprising the following steps: S1. Real-time detection of electrical signals on the input and output sides of the high-voltage static starting inverter.

[0022] In the description of the present invention, real-time detection of electrical signals at the input and output sides of a high-voltage static starting inverter includes the following steps: S11, real-time detection of the input side electrical signal of the high-voltage static starting inverter, and the input side electrical signal includes the input side three-phase voltage signal U SFC_abc With the input side current signal I SFC_abc .

[0023] S12, real-time detection of the output side electrical signal of the high-voltage static starting inverter, and the output side electrical signal includes the output side three-phase voltage signal U SFC_uvw With the output side current signal I SFC_uvw .

[0024] S2. Based on the positive and negative sequence separation, the input side electrical signal is phase-locked to obtain the input side positive sequence variable, and then the input side positive sequence variable is converted into the input side positive sequence AC voltage by inverse transformation.

[0025] In the description of the present invention, based on the positive and negative sequence separation, the input side electrical signal is phase-locked to obtain the input side positive sequence variable, and then the input side positive sequence variable is converted into the input side positive sequence AC voltage by inverse transformation, which includes the following steps: S21, the three-phase voltage signal on the input side U SFC_abc Separate the positive and negative sequences, select the separated positive sequence voltage for phase locking, and obtain the input side positive sequence variable, which includes the input voltage positive sequence angle θ IN+ , input voltage d-axis positive sequence component U IN_d+ And the input voltage q-axis positive sequence component U IN_q+ .

[0026] S22, the input voltage positive sequence angle θ IN+ , input voltage d-axis positive sequence component UIN_d+ And the input voltage q-axis positive sequence component U IN_q+ The reverse transformation operation is performed in sequence to convert the positive sequence AC voltage on the input side, and the positive sequence AC voltage on the input side includes the first input positive sequence AC voltage U IN_a+ , Second input positive sequence AC voltage U IN_b+ And the third input positive sequence AC voltage U IN_c+ .

[0027] S3. By analyzing the numerical relationship of the positive sequence AC voltage on the input side, the shutdown conditions of the integrated gate commutated thyristors of the rectifier bridge are determined, and the rectifier bridge power devices and the rectifier bridge thyristors are shut down.

[0028] In the description of the present invention, the rectifier bridge power devices include a rectifier bridge integrated gate-commutated thyristor GA3, a rectifier bridge integrated gate-commutated thyristor GB3, and a rectifier bridge integrated gate-commutated thyristor GC3.

[0029] The rectifier bridge thyristors include thyristor GA1, thyristor GA2, thyristor GA4, thyristor GA5, thyristor GA6, thyristor GB1, thyristor GB2, thyristor GB4, thyristor GB5, thyristor GB6, thyristor GC1, thyristor GC2, thyristor GC4, thyristor GC5 and thyristor GC6.

[0030] In the description of the present invention, Figure 2-Figure 3 As shown ( Figure 2 The middle line A and Figure 3 The middle line A is connected to form a complete logic flow chart), by analyzing the numerical relationship of the positive sequence AC voltage on the input side, determining the shutdown condition of the rectifier bridge integrated gate commutation thyristor, and executing the shutdown of the rectifier bridge power device and the rectifier bridge thyristor, including the following steps: S31, compare the first input positive sequence AC voltage, the second input positive sequence AC voltage and the third input positive sequence AC voltage, if the first input positive sequence AC voltage is less than the second input positive sequence AC voltage ( U IN_a+ < U IN_b+ ), and the first input positive sequence AC voltage is less than the third input positive sequence AC voltage ( U IN_a+ < U IN_c+ ), the turn-off condition of the rectifier bridge integrated gate-commutated thyristor GA3 is met, and the rectifier bridge integrated gate-commutated thyristor GA3 is turned off.

[0031] S32, if the second input positive sequence AC voltage is less than the first input positive sequence AC voltage ( UIN_b+ < U IN_a+ ), and the second input positive sequence AC voltage is less than the third input positive sequence AC voltage ( U IN_b+ < U IN_c+ ), the turn-off condition of the rectifier bridge integrated gate-commutated thyristor GB3 is met, and the rectifier bridge integrated gate-commutated thyristor GB3 is turned off.

[0032] S33, if the third input positive sequence AC voltage is less than the first input positive sequence AC voltage ( U IN_c+ < U IN_a+ ), and the third input positive sequence AC voltage is less than the second input positive sequence AC voltage ( U IN_c+ < U IN_b+ ), the turn-off condition of the rectifier bridge integrated gate-commutated thyristor GC3 is met, and the rectifier bridge integrated gate-commutated thyristor GC3 is turned off.

[0033] S4. Based on the positive and negative sequence separation, the output side electrical signal is phase-locked to obtain the output side positive sequence variable, and then the output side positive sequence variable is converted into the output side positive sequence AC voltage by inverse transformation.

[0034] In the description of the present invention, based on the positive and negative sequence separation, the output side electrical signal is phase-locked to obtain the output side positive sequence variable, and then the output side positive sequence variable is converted into the output side positive sequence AC voltage by inverse transformation, which includes the following steps: S41, separate the positive and negative sequence of the three-phase voltage signal on the output side, select the separated positive sequence voltage for phase locking, and obtain the output side positive sequence variable, and the output side positive sequence variable includes the output voltage positive sequence angle θ OUT+ , output voltage d-axis positive sequence component U OUT_d+ And the output voltage q-axis positive sequence component U OUT_q+ .

[0035] S42, the output voltage positive sequence angle θ OUT+ , output voltage d-axis positive sequence component U OUT_d+ And the output voltage q-axis positive sequence component U OUT_q+ The reverse transformation operation is performed in sequence to convert the output side positive sequence AC voltage, and the output side positive sequence AC voltage includes the first output positive sequence AC voltage U OUT_u+ , Second output positive sequence AC voltage U OUT_v+And the third output positive sequence AC voltage U OUT_w+ .

[0036] S5. By analyzing the numerical relationship of the positive sequence AC voltage on the output side, the shutdown condition of the inverter bridge integrated gate commutated thyristor is determined, and the inverter bridge power device and the inverter bridge thyristor are shut down.

[0037] In the description of the present invention, the inverter bridge power device includes an inverter bridge integrated gate commutated thyristor GU3, an inverter bridge integrated gate commutated thyristor GV3, and an inverter bridge integrated gate commutated thyristor GW3.

[0038] The inverter bridge thyristors include thyristor GU1, thyristor GU2, thyristor GU4, thyristor GU5, thyristor GU6, thyristor GV1, thyristor GV2, thyristor GV4, thyristor GV5, thyristor GV6, thyristor GW1, thyristor GW2, thyristor GW4, thyristor GW5 and thyristor GW6.

[0039] In the description of the present invention, by analyzing the numerical relationship of the positive sequence AC voltage on the output side, determining the turn-off condition of the inverter bridge integrated gate commutated thyristor, and executing the turn-off of the inverter bridge power device and the inverter bridge thyristor includes the following steps: S51, compare the first output positive sequence AC voltage, the second output positive sequence AC voltage and the third output positive sequence AC voltage, if the first output positive sequence AC voltage is less than the second output positive sequence AC voltage ( U OUT_u+ < U OUT_v+ ), and the first output positive sequence AC voltage is less than the third output positive sequence AC voltage ( U OUT_u+ < U OUT_w+ ), the turn-off condition of the inverter bridge integrated gate-commutated thyristor GU3 is met, and the inverter bridge integrated gate-commutated thyristor GU3 is turned off.

[0040] S52, if the second output positive sequence AC voltage is less than the first output positive sequence AC voltage ( U OUT_v+ < U OUT_u+ ), and the second output positive sequence AC voltage is less than the third output positive sequence AC voltage ( U OUT_v+ < U OUT_w+ ), the turn-off condition of the inverter bridge integrated gate-commutated thyristor GV3 is met, and the inverter bridge integrated gate-commutated thyristor GV3 is turned off.

[0041] S53, if the third output positive sequence AC voltage is less than the first output positive sequence AC voltage (U OUT_w+ < U OUT_u+ ), and the third output positive sequence AC voltage is less than the second output positive sequence AC voltage ( U OUT_w+ < U OUT_v+ ), the turn-off condition of the inverter bridge integrated gate-commutated thyristor GW3 is met, and the inverter bridge integrated gate-commutated thyristor GW3 is turned off.

[0042] See also Figure 4-Figure 8 The present invention also provides a high-voltage static starting inverter anti-straight-through control device, which includes a three-phase rectifier bridge 1, a DC module 2, a three-phase inverter bridge 3 and a high-voltage static starting inverter control system 4.

[0043] The three-phase rectifier bridge 1 is used to integrate the integrated gate commutated thyristor and a plurality of thyristors, and realize the input of DC power by rectifying the input AC power.

[0044] Specifically, Figure 6 As shown, each phase of the three-phase rectifier bridge is composed of a rectifier bridge integrated gate commutated thyristor (IGCT) and a plurality of thyristors, that is, an integrated gate commutated thyristor (IGCT) power device and the thyristors are connected in series in sequence.

[0045] The DC module 2 is used to smooth the rectified DC voltage and reduce current fluctuations.

[0046] The three-phase inverter bridge 3 is used to integrate the integrated gate commutated thyristor and a plurality of thyristors, and output alternating current of different frequencies and amplitudes by adjusting the operating frequency.

[0047] Specifically, Figure 7 As shown, each phase of the three-phase inverter bridge is composed of an inverter bridge integrated gate commutated thyristor (IGCT) and a plurality of thyristors, that is, an integrated gate commutated thyristor (IGCT) power device and the thyristors are connected in series in sequence.

[0048] The high-voltage static starting inverter control system 4 is used to control the opening and closing of the components in the three-phase rectifier bridge and the three-phase inverter bridge through two-way optical fiber communication, and at the same time receive the status information and fault information of the three-phase rectifier bridge and the three-phase inverter bridge.

[0049] In the description of the present invention, the high-voltage static starting inverter control system 4 includes a phase-locking module (not shown in the figure) and an inverse transformation module (not shown in the figure).

[0050] Among them, the phase locking module is used to process the three-phase AC voltage signal to obtain the phase locking angle.

[0051] The inverse transformation module is used to perform coordinate transformation on the positive-sequence dq-axis positive-sequence component of the positive sequence and output a three-phase positive-sequence AC voltage.

[0052] To sum up, with the help of the above-mentioned technical scheme of the present invention, by adopting an integrated gate-commutated thyristor power device and a thyristor hybrid structure, the low on-state voltage drop and high blocking voltage characteristics of the thyristor and the fast switching capability of the transistor are combined, and it has the advantages of low loss, fast switching speed, high capacity density, and high reliability; a high-voltage static starting inverter anti-straight-through control method described in the present invention solves the problem of bridge arm straight-through of the high-voltage static starting inverter under abnormal power supply conditions in the prior art solution, has the advantages of simple and reliable topological structure, improves the startup success rate, and enhances the overall reliability of the system.

[0053] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

Claims

1. A high-voltage static starting inverter anti-through control method, characterized in that: The control method comprises the following steps: S1, real-time detection of electrical signals on the input and output sides of the high-voltage static starting inverter; S2, based on positive and negative sequence separation, phase-lock the input side electrical signal to obtain the input side positive sequence variable, and then use inverse transformation to convert the input side positive sequence variable into the input side positive sequence AC voltage; S3, by analyzing the numerical relationship of the positive sequence AC voltage on the input side, determining the shutdown condition of the rectifier bridge integrated gate commutation thyristor, and executing the shutdown of the rectifier bridge power device and the rectifier bridge thyristor; S4, based on positive and negative sequence separation, the output side electrical signal is phase-locked to obtain the output side positive sequence variable, and then the output side positive sequence variable is converted into the output side positive sequence AC voltage by inverse transformation; S5. By analyzing the numerical relationship of the positive sequence AC voltage on the output side, the shutdown condition of the inverter bridge integrated gate commutated thyristor is determined, and the inverter bridge power device and the inverter bridge thyristor are shut down.

2. A high-voltage static starting inverter anti-shoot-through control method according to claim 1, characterized in that: The real-time detection of electrical signals at the input side and the output side of the high-voltage static starting inverter comprises the following steps: S11, detecting in real time an input side electrical signal of a high-voltage static starting inverter, wherein the input side electrical signal includes an input side three-phase voltage signal and an input side current signal; S12, detecting the output side electrical signal of the high-voltage static starting inverter in real time, wherein the output side electrical signal includes an output side three-phase voltage signal and an output side current signal.

3. A high-voltage static starting inverter anti-shoot-through control method according to claim 2, characterized in that: The method of phase-locking the input side electrical signal to obtain the input side positive sequence variable based on the positive and negative sequence separation, and then using the inverse transformation to convert the input side positive sequence variable into the input side positive sequence AC voltage comprises the following steps: S21, separating the positive and negative sequences of the three-phase voltage signal on the input side, selecting the separated positive sequence voltage for phase locking, and obtaining the input side positive sequence variable, wherein the input side positive sequence variable includes the input voltage positive sequence angle, the input voltage d-axis positive sequence component, and the input voltage q-axis positive sequence component; S22. Perform inverse transformation operations on the input voltage positive-sequence angle, the input voltage d-axis positive-sequence component and the input voltage q-axis positive-sequence component in sequence to convert them into input-side positive-sequence AC voltage, and the input-side positive-sequence AC voltage includes a first input positive-sequence AC voltage, a second input positive-sequence AC voltage and a third input positive-sequence AC voltage.

4. A high-voltage static starting inverter anti-shoot-through control method according to claim 3, characterized in that: The method of analyzing the numerical relationship of the positive sequence AC voltage on the input side, determining the shut-down condition of the rectifier bridge integrated gate commutation thyristor, and shutting down the rectifier bridge power device and the rectifier bridge thyristor comprises the following steps: S31, comparing the first input positive sequence AC voltage, the second input positive sequence AC voltage and the third input positive sequence AC voltage, if the first input positive sequence AC voltage is less than the second input positive sequence AC voltage, and the first input positive sequence AC voltage is less than the third input positive sequence AC voltage, then the turn-off condition of the rectifier bridge integrated gate commutated thyristor GA3 is met, and the rectifier bridge integrated gate commutated thyristor GA3 is turned off; S32: If the second input positive-sequence AC voltage is less than the first input positive-sequence AC voltage, and the second input positive-sequence AC voltage is less than the third input positive-sequence AC voltage, the turn-off condition of the rectifier bridge integrated gate-commutated thyristor GB3 is met, and the rectifier bridge integrated gate-commutated thyristor GB3 is turned off; S33. If the third input positive-sequence AC voltage is less than the first input positive-sequence AC voltage, and the third input positive-sequence AC voltage is less than the second input positive-sequence AC voltage, the shutdown condition of the rectifier bridge integrated gate-commutated thyristor GC3 is met, and the rectifier bridge integrated gate-commutated thyristor GC3 is turned off.

5. A high-voltage static starting inverter anti-shoot-through control method according to claim 4, characterized in that: The rectifier bridge power devices include a rectifier bridge integrated gate commutated thyristor GA3, a rectifier bridge integrated gate commutated thyristor GB3, and a rectifier bridge integrated gate commutated thyristor GC3; The rectifier bridge thyristors include thyristor GA1, thyristor GA2, thyristor GA4, thyristor GA5, thyristor GA6, thyristor GB1, thyristor GB2, thyristor GB4, thyristor GB5, thyristor GB6, thyristor GC1, thyristor GC2, thyristor GC4, thyristor GC5 and thyristor GC6.

6. A high-voltage static starting inverter anti-shoot-through control method according to claim 2, characterized in that: The method of phase-locking the output side electrical signal to obtain the output side positive sequence variable based on the positive and negative sequence separation, and then using the inverse transformation to convert the output side positive sequence variable into the output side positive sequence AC voltage comprises the following steps: S41, separating the positive and negative sequences of the three-phase voltage signal at the output side, selecting the separated positive sequence voltage for phase locking, and obtaining the output side positive sequence variable, wherein the output side positive sequence variable includes the output voltage positive sequence angle, the output voltage d-axis positive sequence component, and the output voltage q-axis positive sequence component; S42, performing inverse transformation operations on the output voltage positive-sequence angle, the output voltage d-axis positive-sequence component and the output voltage q-axis positive-sequence component in sequence to convert them into an output side positive-sequence AC voltage, and the output side positive-sequence AC voltage includes a first output positive-sequence AC voltage, a second output positive-sequence AC voltage and a third output positive-sequence AC voltage.

7. A high-voltage static starting inverter anti-shoot-through control method according to claim 6, characterized in that: The method of analyzing the numerical relationship of the positive sequence AC voltage on the output side, determining the shutdown condition of the inverter bridge integrated gate commutated thyristor, and executing the shutdown of the inverter bridge power device and the inverter bridge thyristor comprises the following steps: S51, comparing the first output positive-sequence AC voltage, the second output positive-sequence AC voltage and the third output positive-sequence AC voltage, if the first output positive-sequence AC voltage is less than the second output positive-sequence AC voltage, and the first output positive-sequence AC voltage is less than the third output positive-sequence AC voltage, then the turn-off condition of the inverter bridge integrated gate-commutated thyristor GU3 is met, and the inverter bridge integrated gate-commutated thyristor GU3 is turned off; S52: If the second output positive-sequence AC voltage is less than the first output positive-sequence AC voltage, and the second output positive-sequence AC voltage is less than the third output positive-sequence AC voltage, the turn-off condition of the inverter bridge integrated gate-commutated thyristor GV3 is met, and the inverter bridge integrated gate-commutated thyristor GV3 is turned off; S53. If the third output positive-sequence AC voltage is less than the first output positive-sequence AC voltage, and the third output positive-sequence AC voltage is less than the second output positive-sequence AC voltage, the turn-off condition of the inverter bridge integrated gate-commutated thyristor GW3 is met, and the inverter bridge integrated gate-commutated thyristor GW3 is turned off.

8. A high-voltage static starting inverter anti-shoot-through control method according to claim 7, characterized in that: The inverter bridge power devices include an inverter bridge integrated gate commutated thyristor GU3, an inverter bridge integrated gate commutated thyristor GV3, and an inverter bridge integrated gate commutated thyristor GW3; The inverter bridge thyristors include thyristor GU1, thyristor GU2, thyristor GU4, thyristor GU5, thyristor GU6, thyristor GV1, thyristor GV2, thyristor GV4, thyristor GV5, thyristor GV6, thyristor GW1, thyristor GW2, thyristor GW4, thyristor GW5 and thyristor GW6.

9. A high-voltage static starting inverter anti-straight-through control device, used to implement the high-voltage static starting inverter anti-straight-through control method according to any one of claims 1 to 8, characterized in that: The device includes a three-phase rectifier bridge, a DC module, a three-phase inverter bridge and a high-voltage static starting inverter control system; The three-phase rectifier bridge is used to integrate the integrated gate-commutated thyristor and several thyristors, and realize the input of DC power by rectifying the input AC power; The DC module is used to smooth the rectified DC voltage and reduce current fluctuations; The three-phase inverter bridge is used to integrate the integrated gate commutated thyristor and a plurality of thyristors, and output AC power of different frequencies and amplitudes by adjusting the operating frequency; The high-voltage static starting inverter control system is used to control the opening and closing of the devices in the three-phase rectifier bridge and the three-phase inverter bridge through bidirectional optical fiber communication, and at the same time receive status information and fault information of the three-phase rectifier bridge and the three-phase inverter bridge.

10. The anti-straight-through control device for high-voltage static starting frequency converter according to claim 1, characterized in that: The high-voltage static starting inverter control system includes a phase-locking module and an inverse transformation module; Wherein, the phase locking module is used to process the three-phase AC voltage signal to obtain the phase locking angle; The inverse transformation module is used to perform coordinate transformation on the positive-sequence dq-axis positive-sequence component of the positive sequence and output a three-phase positive-sequence AC voltage.

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