High-voltage frequency converter optical fiber and master control redundancy fault-tolerant control method and system

Abstract

The invention discloses a high-voltage frequency converter optical fiber and master control redundancy fault-tolerant control method and system, and belongs to the technical field of power electronic control. According to the optical fiber and master control redundancy fault-tolerant control method of the high-voltage frequency converter system, accurate removal of fault devices and online rapid input of redundant devices are achieved, and the optical fiber and master control redundancy fault-tolerant control method has the advantages that the system works continuously and stably at the moment of fault removal; the optical fiber redundancy between the power units and the main control chip redundancy in the main control system ensure that the high-voltage frequency converter system can operate continuously and stably in a complex environment, and the control performance of the high-voltage frequency converter and the reliability of the system are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronic control, and in particular to a high-voltage frequency converter optical fiber and a main control redundant fault-tolerant control method and a system thereof. Background Art

[0002] At present, the mainstream solution for domestic high-voltage inverters is the multi-level solution of power unit series connection. The principle of this inverter topology solution requires that the power supply of each power unit is independent of each other, and each independent power unit communicates with the main control system through a group of optical fibers. Therefore, the number of optical fibers is large, the system connection is complex, and there are many fault points. When a power unit fails, all the units in a certain layer need to be removed. In severe cases, the system will be shut down, affecting the normal use of the high-voltage inverter. The main control system of the high-voltage inverter is the core part of the entire system. Once the main control chip in the main control system is interfered in a complex electromagnetic environment, the system will not work properly. Summary of the invention

[0003] To solve the above problems, the present invention proposes a high-voltage inverter optical fiber and main control redundant fault-tolerant control method and system, which ensures optical fiber redundancy in the form of a redundant ring network while reducing the number of optical fibers used as much as possible. At the same time, combined with the fault-tolerant control method, the control performance of the high-voltage inverter and the reliability of the system are greatly improved, effectively reducing the user's operation and maintenance costs.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a high-voltage inverter optical fiber and a main control redundant fault-tolerant control method, comprising the following steps: S1, real-time monitoring of the status of the optical fiber and the main control system. If a fault in the optical fiber is detected, S2 is executed; if a fault in the main control system is detected, S3 is executed.

[0005] S2: When one optical fiber fails, the system will automatically cut off the path corresponding to the failed optical fiber, and the data will be completely transmitted by another optical fiber to ensure stable operation of the system. If both optical fibers fail, the loop where the fault point is located will be directly bypassed, and the remaining loop will be used to continue to ensure stable and reliable operation of the system.

[0006] S3, when a fault is detected in the main control system, the main control system detects whether the external motor is under open-loop VF control or closed-loop vector control. If it is under open-loop VF control, S4 is executed; if it is under closed-loop vector control, S5-S10 are executed.

[0007] S4, when the external motor belongs to open-loop VF control, if it is detected that both the main control chip 1 and the main control chip 2 are normal or the main control chip 1 is normal and the main control chip 2 is faulty, the unit drive pulse sequence of the main control chip 1 is selected as the actual drive signal of the unit module; if it is detected that the main control chip 1 is faulty and the main control chip 2 is normal, the unit drive pulse sequence of the main control chip 2 is selected as the actual drive signal of the unit module.

[0008] S5, when the external motor belongs to closed-loop vector control, the system initially uses the main control chip 1 as the main control chip, and the main control chip 2 as the auxiliary control chip. The main control chip 1 and the main control chip 2 simultaneously control the motor three-phase current i a 、i b 、i c and motor speed ω r At the same time, the main control chip will need to control the output voltage v α 、v β and the calculated rotor flux ψ rα , rβ , rotor flux angle θ and unit drive pulse sequence are sent to the main control chip 2.

[0009] S6, when the main control chip 1 fails at time m, the current rotor flux ψ is sent to the main control chip 2 rα (m), ψ rβ (m), output voltage v α (m), v β (m).

[0010] S7, the main control chip 2 receives the rotor flux ψ sent by the main control chip 1 at time m. rα (m), ψ rβ (m), output voltage v α (m), v β The three-phase current i of the motor collected by the main control chip 2 at time (m) and m a (m), i b (m), i c (m) and motor speed ω r (m), the two-phase stationary coordinate system current i of the motor at time m+1 α (m+1), i β (m+1) and rotor flux ψ rα (m+1),ψ rβ (m+1) is used for prediction, and the calculation method is: , Among them, i α (m+1), i β (m+1) is the two-phase stationary coordinate system current of the motor at time m+1, ψ rα(m+1),ψ rβ (m+1) is the rotor flux of the two-phase stationary coordinate system of the motor at time m+1, i α (m), i β (m) is the two-phase stationary coordinate system current of the motor at time m, ψ rα (m), ψ rβ (m) is the rotor flux sent by the main control chip at time m, L m is the motor mutual inductance, L r is the motor rotor inductance, R s is the motor stator resistance, R r is the motor rotor resistance, L σ is the motor leakage inductance, T c is the control period, ω r (m) is the motor speed collected by the main control chip 2 at time m.

[0011] The two-phase stationary coordinate system current i of the motor at time m α (m), i β (m) The calculation method is: , Among them, i a (m), i b (m), i c (m) is the three-phase current of the motor collected by the main control chip 2 at time m.

[0012] S8, due to the short system control cycle, the speeds of two adjacent vector motors can be considered to be approximately constant, so ω is set r (m) = ω r (m+1), according to the rotor flux angle θ, the two-phase stationary coordinate system current i of the motor at time m α (m), i β (m) and rotor flux ψ rα (m), ψ rβ (m), and the two-phase stationary coordinate system current i of the motor at time m+1 α (m+1), i β (m+1) and rotor flux ψ rα (m+1),ψ rβ The predicted value of (m+1) is used to obtain the motor two-phase rotating coordinate system current i at time m. d (m), i q (m), rotor flux ψ rd (m), ψ rq (m), and the motor two-phase rotating coordinate system current i at time m+1 d (m+1), i q (m+1), rotor flux ψ rd (m+1),ψrq (m+1) and stator frequency ω s The predicted value of (m+1) is calculated as: , , , , , Among them, i d (m+1), i q (m+1) is the current of the two-phase rotating coordinate system of the motor at time m+1, θ is the rotor flux angle, ψ rd (m+1),ψ rq (m+1) is the rotor flux of the motor two-phase rotating coordinate system at time m+1, i d (m), i q (m) is the current of the two-phase rotating coordinate system of the motor at time m, ψ rd (m), ψ rq (m) is the rotor flux of the motor two-phase rotating coordinate system at time m, ω s (m+1) is the predicted value of the stator frequency of the motor two-phase rotating coordinate system at time m+1, T r is the motor rotor time constant, cos is the cosine trigonometric function, and sin is the sine trigonometric function.

[0013] S9, in order to ensure that the system state does not change suddenly from time m to time m+1, according to the motor two-phase rotating coordinate system current i at time m+1 d (m+1), i q (m+1), rotor flux ψ rd (m+1),ψ rq (m+1) and stator frequency ω s The predicted value of (m+1) is used to calculate the voltage v that needs to be controlled at the output at time m+1. α (m+1), v β (m+1), calculated as: , , Among them, v d (m+1), v q (m+1) is the value of the output voltage that needs to be controlled at time m+1 in the two-phase rotating coordinate system. , is the stator current of the motor in the two-phase rotating coordinate system at time m+1, v α (m+1), v β(m+1) is the output voltage controlled at time m+1.

[0014] S10, the output voltage v that needs to be controlled at time m+1 calculated according to S9 α (m+1), v β (m+1), the unit drive pulse sequence is recalculated through the modulation algorithm to ensure that each power unit can work normally.

[0015] The present invention further proposes a high-voltage frequency converter optical fiber and main control redundant system, which is used for the above-mentioned high-voltage frequency converter optical fiber and main control redundant fault-tolerant control method, comprising: a high-voltage power grid, a multi-secondary phase-shifting transformer, a load M, an optical fiber, a main control system, and N power units for each phase of A, B, and C, wherein N is a positive integer representing the total number of unit layers of the high-voltage frequency converter, and each layer of power units includes one power unit A for each of the three phases A, B, and C. y , B y , C y , y=1, 2, ..., N; the high voltage grid is connected to the input end of the multi-secondary phase-shifting transformer; the 3N output ends of the multi-secondary phase-shifting transformer are connected to a total of 3N power units of the three phases A, B, and C; the N power units of each phase of the three phases A, B, and C are connected in a cascade manner, the three-phase cascade power units are connected in a Y-connection manner, and their outputs are connected to the load M.

[0016] Furthermore, the main control system can form a loop with n layers of power units, where n≤N. Data is transmitted between the main control system and the power units, and between the power units in each loop through two optical fibers. The internal connection method of the loop is any connection method that satisfies the requirement of starting from the main control system without repeatedly traversing the power units in each loop and then returning to the main control system.

[0017] Furthermore, the main control system includes two main control chips: main control chip one and main control chip two; main control chip one and main control chip two are any one of DSP, ARM, and FPGA; main control chip one and main control chip two communicate with each other in a serial or parallel manner.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. Use fewer optical fibers to achieve fiber communication redundancy; 2. The main control chip and communication optical fiber in the main control system can achieve redundant control; 3. Fault-tolerant control ensures that the redundant system can be put into operation quickly when a fault occurs. The system state is smooth, continuous and stable at the moment of fault removal, reducing user operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1The figure is a flow chart of the steps of the high-voltage frequency converter optical fiber and main control redundant fault-tolerant control method proposed by the present invention; Figure 2 The figure shows the topology diagram of the high voltage inverter redundant 1-ring system proposed by the present invention; Figure 3 The figure shows the topology diagram of the redundant 2-ring system of the high-voltage frequency converter proposed by the present invention; Figure 4 Shown is another example of the G module of the high-voltage inverter redundant 2-ring system topology diagram proposed by the present invention; Figure 5 The figure shows another example of the G module of the high voltage inverter redundant 2-ring system topology diagram proposed by the present invention; Figure 6 The figure shows the topology diagram of the high voltage inverter redundant 3-ring system proposed by the present invention; Figure 7 The figure shows the topology diagram of the high-voltage inverter dual main control chip and redundant 1-ring system proposed by the present invention. DETAILED DESCRIPTION

[0020] The following is only a preferred embodiment of the present invention. The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can understand the present invention. It should be pointed out that for those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention defined and determined by the attached claims without departing from the principle of the present invention, all inventions and creations using the concept of the present invention are protected.

[0021] Figure 1 FIG. 1 is a flowchart of the steps of the high-voltage frequency converter optical fiber and main control redundant fault-tolerant control method proposed by the present invention, as shown in FIG. Figure 1 As shown, the high-voltage inverter optical fiber and main control redundant fault-tolerant control method includes the following steps: S1, real-time monitoring of the status of the optical fiber and the main control system. If a fault in the optical fiber is detected, S2 is executed; if a fault in the main control system is detected, S3 is executed.

[0022] S2: When a fiber fails, the system will automatically cut off the path corresponding to the failed fiber, and the data will be completely transmitted by another fiber to ensure stable operation of the system. If both fibers fail, the loop where the fault point is located will be bypassed directly, and the remaining loop will be used to continue to ensure stable and reliable operation of the system.

[0023] S3, when a fault is detected in the main control system, the main control system detects whether the external motor is under open-loop VF control or closed-loop vector control. If it is under open-loop VF control, S4 is executed; if it is under closed-loop vector control, S5-S10 are executed.

[0024] S4, when the external motor belongs to open-loop VF control, if it is detected that both the main control chip 1 and the main control chip 2 are normal or the main control chip 1 is normal and the main control chip 2 is faulty, the unit drive pulse sequence of the main control chip 1 is selected as the actual drive signal of the unit module; if it is detected that the main control chip 1 is faulty and the main control chip 2 is normal, the unit drive pulse sequence of the main control chip 2 is selected as the actual drive signal of the unit module.

[0025] S5, when the external motor belongs to closed-loop vector control, the system initially uses the main control chip 1 as the main control chip, and the main control chip 2 as the auxiliary control chip. The main control chip 1 and the main control chip 2 simultaneously control the motor three-phase current i a 、i b 、i c and motor speed ω r At the same time, the main control chip will need to control the output voltage v α 、v β and the calculated rotor flux ψ rα , rβ , rotor flux angle θ and unit drive pulse sequence are sent to the main control chip 2.

[0026] S6, when the main control chip 1 fails at time m, the current rotor flux ψ is sent to the main control chip 2 rα (m), ψ rβ (m), output voltage v α (m), v β (m).

[0027] S7, the main control chip 2 receives the rotor flux ψ sent by the main control chip 1 at time m. rα (m), ψ rβ (m), output voltage v α (m), v β The three-phase current i of the motor collected by the main control chip 2 at time (m) and m a (m), i b (m), i c (m) and motor speed ω r (m), the two-phase stationary coordinate system current i of the motor at time m+1 α (m+1), i β (m+1) and rotor flux ψ rα (m+1),ψ rβ (m+1) is used for prediction, and the calculation method is: , Among them, i α (m+1), i β (m+1) is the two-phase stationary coordinate system current of the motor at time m+1, ψ rα(m+1),ψ rβ (m+1) is the rotor flux of the two-phase stationary coordinate system of the motor at time m+1, i α (m), i β (m) is the two-phase stationary coordinate system current of the motor at time m, ψ rα (m), ψ rβ (m) is the rotor flux sent by the main control chip at time m, L m is the motor mutual inductance, L r is the motor rotor inductance, R s is the motor stator resistance, R r is the motor rotor resistance, L σ is the motor leakage inductance, T c is the control period, ω r (m) is the motor speed collected by the main control chip 2 at time m.

[0028] The two-phase stationary coordinate system current i of the motor at time m α (m), i β (m) The calculation method is: , Among them, i a (m), i b (m), i c (m) is the three-phase current of the motor collected by the main control chip 2 at time m.

[0029] S8, due to the short system control cycle, the speeds of two adjacent vector motors can be considered to be approximately constant, so there is ω r (m) = ω r (m+1), according to the rotor flux angle θ, the two-phase stationary coordinate system current i of the motor at time m α (m), i β (m) and rotor flux ψ rα (m), ψ rβ (m), and the two-phase stationary coordinate system current i of the motor at the time m+1 α (m+1), i β (m+1) and rotor flux ψ rα (m+1),ψ rβ The predicted value of (m+1) is used to obtain the motor two-phase rotating coordinate system current i at time m. d (m), i q (m), rotor flux ψ rd (m), ψ rq (m), and the motor two-phase rotating coordinate system current i at time m+1 d (m+1), i q (m+1), rotor flux ψ rd (m+1),ψrq (m+1) and stator frequency ω s The predicted value of (m+1) is calculated as: , , , , , Among them, i d (m+1), i q (m+1) is the current of the two-phase rotating coordinate system of the motor at time m+1, θ is the rotor flux angle, ψ rd (m+1),ψ rq (m+1) is the rotor flux of the motor two-phase rotating coordinate system at time m+1, i d (m), i q (m) is the current of the two-phase rotating coordinate system of the motor at time m, ψ rd (m), ψ rq (m) is the rotor flux of the motor two-phase rotating coordinate system at time m, ω s (m+1) is the predicted value of the stator frequency of the motor two-phase rotating coordinate system at time m+1, T r is the motor rotor time constant, cos is the cosine trigonometric function, and sin is the sine trigonometric function.

[0030] S9, in order to ensure that the system state does not change suddenly from time m to time m+1, according to the motor two-phase rotating coordinate system current i at time m+1 d (m+1), i q (m+1), rotor flux ψ rd (m+1),ψ rq (m+1) and stator frequency ω s The predicted value of (m+1) is used to calculate the voltage v that needs to be controlled at time m+1. α (m+1), v β (m+1), the calculation method is: , , Among them, v d (m+1), v q (m+1) is the value of the output voltage that needs to be controlled at time m+1 in the two-phase rotating coordinate system. , is the stator current of the motor in the two-phase rotating coordinate system at time m+1, v α (m+1), v β(m+1) is the output voltage controlled at time m+1.

[0031] S10, the output voltage v that needs to be controlled at time m+1 calculated according to S9 α (m+1), v β (m+1), the unit drive pulse sequence is recalculated through the modulation algorithm to ensure that each power unit can work normally.

[0032] The present invention further provides a high-voltage frequency converter optical fiber and main control redundancy system, which is used for the above-mentioned high-voltage frequency converter optical fiber and main control redundancy fault-tolerant control method. Figure 2 The figure shows the topology diagram of the high voltage inverter redundant 1-ring system proposed by the present invention, as shown in FIG. Figure 2 As shown, the redundant 1-ring high-voltage inverter communication system includes: a high-voltage power grid, a multi-secondary phase-shifting transformer, a motor M, an optical fiber, a main control system, and N power units for each phase A, B, and C, where N is a positive integer representing the total number of high-voltage inverter unit layers, and each layer of power units includes one power unit A for each phase A, B, and C. y , B y , C y , y=1, 2, ..., N; the high-voltage power grid is connected to the input end of the multi-secondary phase-shifting transformer; the 3N output ends of the multi-secondary phase-shifting transformer are connected to a total of 3N power units of the three phases A, B, and C; the N power units of each phase of the three phases A, B, and C are connected in a cascade manner, and the three-phase cascade power units are connected in a Y-connection manner, and their outputs are connected to the motor M; the main control system and the 1-layer power unit together form a loop.

[0033] Among them, the connection method of the first ring of optical fiber communication is: starting from the main control system, passing through the A1 phase power unit, the B1 phase power unit, and the C1 phase power unit in sequence, and then returning to the main control system; the connection method of the second ring of optical fiber communication is: starting from the main control system, passing through the A2 phase power unit, the B2 phase power unit, and the C2 phase power unit in sequence, and then returning to the main control system; the connection method of the third ring of optical fiber communication is: starting from the main control system, passing through the A3 phase power unit, the B3 phase power unit, and the C3 phase power unit in sequence, and then returning to the main control system; the remaining rings are connected in the above manner until all loops are fully connected.

[0034] Figure 3 The figure shows the topology diagram of the high voltage inverter redundant 2-ring system proposed by the present invention, as shown in FIG. Figure 3 As shown, the redundant 2-ring high-voltage inverter communication system includes: a high-voltage power grid, a multi-secondary phase-shifting transformer, a motor M, an optical fiber, a main control system, and N power units for each phase A, B, and C, where N is a positive integer representing the total number of high-voltage inverter unit layers, and each layer of power units includes one power unit A for each phase A, B, and C. y , B y, C y , y=1, 2, ..., N; the high voltage grid is connected to the input end of the multi-secondary phase-shifting transformer; the 3N output ends of the multi-secondary phase-shifting transformer are connected to a total of 3N power units of the three phases A, B, and C; the N power units of each phase of the three phases A, B, and C are connected in a cascade manner, and the three-phase cascade power units are connected in a Y-connection manner, and their outputs are connected to the motor M. The main control system and the two-layer power units together form a loop, Figure 3 The module G shown in FIG. 1 is a demonstration module for optical fiber connection.

[0035] Among them, the connection method of the first ring of optical fiber communication is: starting from the main control system, passing through the A1 phase power unit, B1 phase power unit, C1 phase power unit, A2 phase power unit, B2 phase power unit, C2 phase power unit in sequence and then returning to the main control system; the connection method of the second ring of optical fiber communication is: starting from the main control system, passing through the A3 phase power unit, B3 phase power unit, C3 phase power unit, A4 phase power unit, B4 phase power unit, C4 phase power unit in sequence and then returning to the main control system; the connection method of the third ring of optical fiber communication is: starting from the main control system, passing through the A5 phase power unit, B5 phase power unit, C5 phase power unit, A6 phase power unit, B6 phase power unit, C6 phase power unit in sequence and then returning to the main control system; the remaining rings are connected in the above manner until all loops are fully connected.

[0036] Figure 4 FIG. 1 is another example of the G module of the redundant 2-ring system topology diagram of the high-voltage inverter proposed by the present invention, as shown in FIG. Figure 4 As shown, the optical fiber connection method shown in module G can be as follows:

[0037] The connection method of the first ring of optical fiber communication is: starting from the main control system, passing through the A1 phase power unit, the B1 phase power unit, the A2 phase power unit, the C1 phase power unit, the B2 phase power unit, and the C2 phase power unit in turn, and then returning to the main control system; the remaining rings are connected in the same way until all loops are connected.

[0038] Figure 5 FIG. 4 is another example of the G module of the redundant 2-ring system topology diagram of the high-voltage inverter proposed by the present invention. Figure 5 As shown, the optical fiber connection method shown in module G can also be as follows:

[0039] The connection method of the first ring of optical fiber communication is: starting from the main control system, passing through the A1 phase power unit, the A2 phase power unit, the B1 phase power unit, the C1 phase power unit, the B2 phase power unit, and the C2 phase power unit in turn, and then returning to the main control system; the remaining rings are connected in the same way until all the loops are connected.

[0040] Figure 6 The figure shows the topology diagram of the high voltage inverter redundant three-ring system proposed by the present invention, as shown in FIG. Figure 6 As shown, the redundant 3-ring high-voltage inverter communication system includes: a high-voltage power grid, a multi-side phase-shifting transformer, a motor M, an optical fiber, a main control system, and N power units for each phase A, B, and C, where N is a positive integer representing the total number of high-voltage inverter unit layers, and each layer of power units includes one power unit A for each phase A, B, and C. y , B y , C y , y=1, 2, ..., N; the high-voltage power grid is connected to the input end of the multi-secondary phase-shifting transformer; the 3N output ends of the multi-secondary phase-shifting transformer are connected to a total of 3N power units of the three phases A, B, and C; the N power units of each phase of the three phases A, B, and C are connected in a cascade manner, and the three-phase cascade power units are connected in a Y-connection manner, and their outputs are connected to the motor M; the main control system and the three-layer power units together form a loop.

[0041] Among them, the connection method of the first ring of optical fiber communication is: starting from the main control system, passing through A1 phase power unit, B1 phase power unit, C1 phase power unit, A2 phase power unit, B2 phase power unit, C2 phase power unit, A3 phase power unit, B3 phase power unit, C3 phase power unit in sequence and then returning to the main control system; the connection method of the second ring of optical fiber communication is: starting from the main control system, passing through A4 phase power unit, B4 phase power unit, C4 phase power unit, A5 phase power unit, B5 phase power unit, C5 phase power unit, A6 phase power unit, B6 phase power unit, C6 phase power unit in sequence and then returning to the main control system; the connection method of the third ring of optical fiber communication is: starting from the main control system, passing through A7 phase power unit, B7 phase power unit, C7 phase power unit, A8 phase power unit, B8 phase power unit, C8 phase power unit, A9 phase power unit, B9 phase power unit, C9 phase power unit in sequence and then returning to the main control system; the remaining rings are connected in the above manner until all loops are fully connected.

[0042] Figure 7 The figure shows the topology diagram of the high voltage inverter dual main control chip and redundant 1 ring system proposed by the present invention. Figure 7 As shown, the dual-main control chip and redundant 1-ring high-voltage inverter communication system includes: a high-voltage power grid, a multi-secondary phase-shifting transformer, a motor M, an optical fiber, a main control system, and N power units for each phase A, B, and C, where N is a positive integer representing the total number of high-voltage inverter unit layers, and each layer of power units includes one power unit A for each phase A, B, and C. y , B y , C y, y=1, 2, ..., N; the high-voltage power grid is connected to the input end of the multi-secondary phase-shifting transformer; the 3N output ends of the multi-secondary phase-shifting transformer are connected to a total of 3N power units of the three phases A, B, and C; the N power units of each phase of the three phases A, B, and C are connected in a cascade manner, and the three-phase cascade power units are connected in a Y-connection manner, and their outputs are connected to the motor M; the main control system and the 1-layer power unit together form a loop.

[0043] Among them, the connection method of the first optical fiber of the first ring of optical fiber communication is: starting from the main control chip one, passing through the A1 phase power unit, the B1 phase power unit, and the C1 phase power unit in sequence, and then returning to the main control chip one; the connection method of the second optical fiber of the first ring of optical fiber communication is: starting from the main control chip two, passing through the A1 phase power unit, the B1 phase power unit, and the C1 phase power unit in sequence, and then returning to the main control chip two; the remaining rings are connected in the above manner until all loops are fully connected.

[0044] Among them, the main control system includes main control chip one and main control chip two, and main control chip one and main control chip two are any one of DSP, ARM, and FPGA; main control chip one and main control chip two communicate through serial or parallel methods, and their data are transmitted interactively in real time.

[0045] The present invention ensures optical fiber redundancy in the form of a redundant ring network while reducing the number of optical fibers used as much as possible. At the same time, combined with a fault-tolerant control method, the control performance of the high-voltage inverter and the reliability of the system are greatly improved, effectively reducing the user's operation and maintenance costs.

[0046] Although the specific implementation of the invention is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of the patent of the present invention. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of the patent of the present invention.

Claims

1. A high-voltage frequency converter optical fiber and master control redundant fault-tolerant control method, characterized in that: The following steps are involved: S1, real-time monitoring of the status of the optical fiber and the main control system. If a fault in the optical fiber is detected, S2 is executed; if a fault in the main control system is detected, S3 is executed; S2: When one optical fiber fails, the system will automatically cut off the path corresponding to the failed optical fiber, and the data will be completely transmitted by another optical fiber to ensure stable operation of the system. If both optical fibers fail, the loop where the fault point is located will be directly bypassed, and the remaining loop will be used to ensure stable and reliable operation of the system. S3, when a fault is detected in the main control system, the main control system detects whether the external motor is under open-loop VF control or closed-loop vector control. If it is under open-loop VF control, S4 is executed; if it is under closed-loop vector control, S5-S10 is executed; S4, when the external motor belongs to open-loop VF control, if it is detected that both the main control chip 1 and the main control chip 2 are normal or the main control chip 1 is normal and the main control chip 2 is faulty, the unit drive pulse sequence of the main control chip 1 is selected as the actual drive signal of the unit module; if it is detected that the main control chip 1 is faulty and the main control chip 2 is normal, the unit drive pulse sequence of the main control chip 2 is selected as the actual drive signal of the unit module; S5, when the external motor belongs to closed-loop vector control, the system initially uses the main control chip 1 as the main control chip, and the main control chip 2 as the auxiliary control chip. The main control chip 1 and the main control chip 2 simultaneously control the motor three-phase current i a 、i b 、i c and motor speed ω r At the same time, the main control chip will need to control the output voltage v α 、v β and the calculated rotor flux ψ rα , rβ , the rotor flux angle θ and the unit drive pulse sequence are sent to the main control chip 2; S6, when the main control chip 1 fails at time m, the current rotor flux ψ is sent to the main control chip 2 rα (m), ψ rβ (m), output voltage v α (m), v β (m); S7, the main control chip 2 receives the rotor flux ψ sent by the main control chip 1 at time m. rα (m), ψ rβ (m), output voltage v α (m), v β The three-phase current i of the motor collected by the main control chip 2 at time (m) and m a (m), i b (m), i c (m) and motor speed ω r (m), the two-phase stationary coordinate system current i of the motor at time m+1 α (m+1), i β (m+1) and rotor flux ψ rα (m+1),ψ rβ (m+1) is used for prediction, and the calculation method is: ， Among them, i α (m+1), i β (m+1) is the two-phase stationary coordinate system current of the motor at time m+1, ψ rα (m+1),ψ rβ (m+1) is the rotor flux of the two-phase stationary coordinate system of the motor at time m+1, i α (m), i β (m) is the two-phase stationary coordinate system current of the motor at time m, ψ rα (m), ψ rβ (m) is the rotor flux sent by the main control chip at time m, L m is the motor mutual inductance, L r is the motor rotor inductance, R s is the motor stator resistance, R r is the motor rotor resistance, L σ is the motor leakage inductance, T c is the control period, ω r (m) is the motor speed acquired by the main control chip 2 at time m; The two-phase stationary coordinate system current i of the motor at time m α (m), i β (m) The calculation method is: ， Among them, i a (m), i b (m), i c (m) is the three-phase current of the motor collected by the main control chip 2 at time m; S8, due to the short system control cycle, the speeds of two adjacent vector motors can be considered to be approximately constant, so ω is set r (m) = ω r (m+1), according to the rotor flux angle θ, the two-phase stationary coordinate system current i of the motor at time m α (m), i β (m) and rotor flux ψ rα (m), ψ rβ (m), and the two-phase stationary coordinate system current i of the motor at the time m+1 α (m+1), i β (m+1) and rotor flux ψ rα (m+1),ψ rβ The predicted value of (m+1) is used to obtain the motor two-phase rotating coordinate system current i at time m. d (m), i q (m), rotor flux ψ rd (m), ψ rq (m), and the motor two-phase rotating coordinate system current i at time m+1 d (m+1), i q (m+1), rotor flux ψ rd (m+1),ψ rq (m+1) and stator frequency ω s The predicted value of (m+1) is calculated as: ， ， ， ， ， Among them, i d (m+1), i q (m+1) is the current of the two-phase rotating coordinate system of the motor at time m+1, θ is the rotor flux angle, ψ rd (m+1),ψ rq (m+1) is the rotor flux of the motor two-phase rotating coordinate system at time m+1, i d (m), i q (m) is the current of the two-phase rotating coordinate system of the motor at time m, ψ rd (m), ψ rq (m) is the rotor flux of the motor two-phase rotating coordinate system at time m, ω s (m+1) is the predicted value of the stator frequency of the motor two-phase rotating coordinate system at time m+1, T r is the motor rotor time constant, cos is the cosine trigonometric function, and sin is the sine trigonometric function; S9, in order to ensure that the system state does not change suddenly from time m to time m+1, according to the motor two-phase rotating coordinate system current i at time m+1 d (m+1), i q (m+1), rotor flux ψ rd (m+1),ψ rq (m+1) and stator frequency ω s The predicted value of (m+1) is used to calculate the voltage v that needs to be controlled at the output at time m+1. α (m+1), v β (m+1), the calculation method is: ， ， Among them, v d (m+1), v q (m+1) is the value of the output voltage that needs to be controlled at time m+1 in the two-phase rotating coordinate system. , is the stator current of the motor in the two-phase rotating coordinate system at time m+1, v α (m+1), v β (m+1) is the output voltage controlled at time m+1; S10, the output voltage v that needs to be controlled at time m+1 calculated according to S9 α (m+1), v β (m+1), the unit drive pulse sequence is recalculated through the modulation algorithm to ensure that each power unit can work normally.

2. A high-voltage frequency converter optical fiber and main control redundancy system, used to implement the high-voltage frequency converter optical fiber and main control redundancy fault-tolerant control method according to claim 1, characterized in that: The high-voltage inverter optical fiber and main control redundant system includes: a high-voltage power grid, a multi-side phase-shifting transformer, a load M, an optical fiber, a main control system, and N power units for each phase of A, B, and C, where N is a positive integer representing the total number of unit layers of the high-voltage inverter, and each layer of power units includes one power unit A for each phase of A, B, and C. y , B y , C y , y=1, 2, ..., N; the high-voltage power grid is connected to the input end of the multi-secondary phase-shifting transformer; the 3N output ends of the multi-secondary phase-shifting transformer are connected to the 3N power units of the three phases A, B, and C in total; the N power units of each phase of the three phases A, B, and C are connected in a cascade manner, the three-phase cascade power units are connected in a Y-connection manner, and their outputs are connected to a load M.

3. A high-voltage frequency converter optical fiber and master control redundancy system as claimed in claim 2, characterized in that: The main control system can form a loop together with n layers of power units, where n≤N. Data is transmitted between the main control system and the power units, and between the power units in each loop through two optical fibers. The internal connection method of the loop is any connection method that satisfies the requirement of starting from the main control system and returning to the main control system without repeatedly traversing the power units in each loop.

4. A high-voltage frequency converter optical fiber and master control redundancy system as claimed in claim 2, characterized in that: The main control system includes two main control chips: main control chip 1 and main control chip 2; the main control chip 1 and main control chip 2 are any one of DSP, ARM, and FPGA; the main control chip 1 and main control chip 2 communicate with each other in a serial or parallel manner.

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