TWI245479B - Multi-module type inverter control system - Google Patents

Abstract

Disclosed is a multi-module type inverter control system. The system is used to control at least one inverter module to provide the power needed for the system load, moreover, featuring redundancy, hot plugging, and resetting mechanism. The system comprises at least one voltage control unit connecting to the load, said inverter modules, and a logic unit to enable the voltage control unit outputting the error voltage signals and synchronous signals to said inverter modules; a redundancy control unit connecting to the logic unit and is responsible for transmitting the control signals to the logic unit in order to drive the voltage control unit; at least one reset control unit connecting to decoding circuit and said inverter modules to output the reset signals to said decoding circuit; at least one reset circuit connecting to said decoding circuit and the inverter modules to carry out resetting of said inverter modules.

Description

1245479 V. Description of the invention (1) • [Technical field to which the invention belongs] A multi-module inverter control system, especially a multi-module inverter with redundancy (redundancy) and hot-plug reset function Control system. [Previous technology] In recent years, due to the popularization of uninterruptible power systems (UPS), the continuity of load power supply is gradually not affected by power outages. However, due to the increasing demand for electricity, the capacity of a single UPS is no longer sufficient, and it limits the expansion of the system. In order to improve the power supply capacity and reliability of the system, parallel operation of UPS or inverters has become an inevitable trend. Such a parallel system, in addition to improving the power supply capacity of the system, also has many important features; such as · Redundant Operation, Modular Design, and Current-Sharing Control Scheme), maintainability and size reduction, etc. The operation of a parallel system must meet the following two main conditions, otherwise the system will generate a circulating current and cause the system to burn: (1), each Converters operating in parallel need to distribute the load current according to their power ratings. (2) The output voltage of each inverter module must be the same frequency and the same phase. In order to meet the above characteristics and conditions, the conventional method for parallel operation of converters is best achieved by combining voltage control and current control for parallel operation, and it is also the most common. The parallel operation mode of voltage and current combined control is: internal loop current control to improve the transient response of the system, and external loop voltage control to improve the stability of the system (Stabi 1 ty).

Page 5 1245479 • V. Description of the invention (2) However, in the conventional parallel architecture, each converter module is an independent and complete system, and the controller is also included in the system. The benefits of this design are high modularity and flexibility in capacity expansion. But the cost is high and hot-plugging is not easy. Even with the hot-swap function, plug-in converter modules cannot be guaranteed to operate normally, so the entire parallel system may be affected by abnormal modules. [Summary of the Invention] In view of this, a multi-module inverter control system of the present invention is a parallel system for multi-module inverters, which is used to provide a redundant (redun dancy) and hot-plug reset function. Multi-module inverter control system. To achieve the above object, the present invention relates to a multi-module inverter control system, which is connected to a load and at least one inverter module, and is connected to a logic unit, a load, and the inverter modules by using at least one voltage control unit. And send a voltage error signal and a synchronization signal to the parallel converter modules for adjustment of the output voltage and synchronous operation of each parallel converter module. The redundant control unit is connected to the logic unit and transmits a control signal to the logic unit to drive the voltage control units. At the same time, the voltage control units are divided into a main control voltage according to the output of the voltage error signal and the synchronization signal. The control unit and at least one redundant voltage control unit. The redundant voltage control units are introduced into the system through the control of the redundant control unit when the main control voltage control unit is abnormal to provide voltage control. The reset control unit is connected to a decoding circuit and the inverter modules, and the abnormality can be determined by receiving an abnormal signal transmitted by the abnormal inverter module.

Page 6 1245479 Fifth, the description of the invention (3) '— ~ _____________ The position of the flow module, and turn to the boat's life. After the signal is decoded, a reset signal is output. The decoding circuit transmits the abnormality to the reset circuit for the abnormal converter module 2 = 2, < reset operation. The multi-module inverter control system of the present invention operates synchronously and provides controllable belts on wheels and power output; regulation of each parallel output voltage. Same as δ, I °, as the output unit, used to improve the power supply of the system;: _ for at least-redundant voltage control Hot plugging action of parallel converter modules: ί. = Foreign second The present invention also needs to: The connected system will not cause malfunction due to the plug-in converter module Cui Bao. Based on the above-mentioned design technology, the multi-module inverter control system of the present invention can reduce the design cost of parallel operation of the inverters, the reliability can be greatly improved, and it is highly modularized. [Embodiment] In order to allow your reviewers to further understand the technology and means used by the present invention to achieve the intended purpose, please refer to the following detailed description of the present invention and the accompanying drawings. It is believed that the purpose, features and characteristics of the present invention should be Get an in-depth and specific understanding. However, the drawings are provided for reference and explanation only, and are not intended to limit the present invention. Referring to the first figure, it is a block diagram of a control architecture of a multi-module inverter control system according to the present invention. The control system 1 of the present invention is connected to a load 3 and at least one inverter module 2. The converter modules 2 are composed of a current weighted distribution control circuit (CWDC), a current controller and a power stage. The current weighted distributed control circuit (CWDC)

1245479 _15. Explanation of the invention (4) The inductor current to the load 3 is generated according to the power ratings of the converter modules 2 (Power Ratings), and then the weighted current is transmitted to the current controller. . After the current controller obtains the weighted current, it is integrated with the inductor current of the converter modules 2 and the voltage error signal VE: of the voltage control unit to generate a current error signal I E to control the output of the power stage. Furthermore, the control system 1 first sends a synchronization signal to the converter modules 2 to make all the parallel converter modules 2 operate synchronously and obtain one of the output voltage Vo of the load 3 and compare the output After the voltage Vo and a reference voltage Vr ef, a voltage error signal VE is generated and transmitted to the power stages of the converter modules 2 to control the output of the power stage. As described above, the power levels of the inverter modules 2 are used to control the pulse width of the sinusoidal pulse width modulation (SPWM) signal according to the current error signal and the voltage error signal, thereby adjusting the output voltage of the load 3, Current to achieve the effect of output voltage regulation. Referring to the second figure, it is a schematic block diagram of a circuit of a multi-module inverter control system according to the present invention. The control system 1 is connected to a load 3 and at least one converter module 2 and includes: a control module 1 2, a logic unit 14, 4, at least a voltage control unit 16, a decoding circuit 18, and at least one Placing circuit 19. In the above description, the control module 12 is composed of a redundant control unit 12 0 and a reset control unit 12 2. Referring again to the second figure, the redundant control unit 120 is connected to the logic unit 14 and transmits a control signal to the logic unit 14 to drive at least one voltage control unit 16 connected to the logic unit 14 to operate. The voltage control units 16 are connected to the load 3 and the inverter modules 2 and receive redundant control.

Page 8 1245479 V. Description of the invention (5) A sinusoidal pulse width modulation (spwM) signal transmitted by the unit 120 is used to generate the reference voltage Vref and obtain the output voltage v0 of the load 3. The voltage control units 16 compare the reference voltage Vref and the output voltage v0 at the same time, and then generate a voltage error signal to the inverter modules 2 to control the output of the power stage of the inverter modules 2. To achieve the effect of load 3 output voltage regulation. At the same time, the synchronous operation of the converter modules 2 connected in parallel by the transmission of the synchronization signal will not cause the circulating current to cause the system to burn. Let ’s refer to the figure below. The redundant operation mode of control system 1 is as follows: When the normal operation of control system 1 is started, these voltage control units 6 and 6 are based on the voltage error signal VE: and the output of the synchronization signal is divided into one. The main control voltage control unit and at least one redundant voltage control unit. In the above description, at startup, the voltage error signal VE and the voltage of the synchronization signal are generated early το 16 is the main control voltage control unit, and the remaining 16 units are redundant voltage control units. --- Controlled early W #Main η control φ voltage control unit is responsible for the voltage_: synchronous operation of these converter modules 2 and it will send out synchronization signal and voltage error.

The connected inverter modules 2 are used for output voltage compensation. In addition, some converter modules use internal current weighted distribution control circuits (cwD 丄 :: the inductor module 2 outputs the current error signal IE of the inductor to the load 3). The power level of group 2 is based on the current error signal 1 ^^ §fl #u VE, which is used to control the sinusoidal pulse width modulation (spfM) ^ and then adjust the negative voltage and current to achieve the output voltage regulation <efficacy.

Page 9 1245479 V. Description of the invention (6) As mentioned above, the main control voltage control unit will send a synchronous signal of 60HZ to the redundant voltage control units to synchronize with them. In addition, they communicate with each other through serial communication. Send a message to see if each other is healthy. When an abnormality occurs, the redundant control unit 120 sends a control signal to the logic unit 14 and drives the voltage control units 16 by the logic unit 14 to replace the main control voltage control unit. To protect the system in the event of an abnormality and improve the reliability of the system work. Please refer to the second figure again. The reset control unit 1 2 2 is connected to a decoding circuit 18 and the inverter modules 2 and is used to detect the inverters by scanning (S ca η) method. The converter module 2 is used to receive the operation of the converter module 2 when it is embedded in parallel (P 1 ug-i η). When an abnormal operation occurs in the converter module 2 embedded in (P 1 ug-i η), the module sends an abnormal signal to the reset control unit 1 2 2 and the reset control unit 1 2 2 receives the abnormal A decoded signal is output to the decoding circuit 18 after the signal, and a reset signal is output after decoding to drive at least one reset circuit 19 connected to the decoding circuit 18. The reset circuits 19 are relatively connected to the inverter modules 2 and are used to reset the abnormal inverter module 2 after receiving the reset signal, so as to ensure that the parallel system does not cause embedding (Plug -in) Malfunction due to abnormality of inverter module 2. Please refer to the third figure, which is a schematic diagram of the redundant voltage control circuit of the multi-module inverter control system of the present invention. Among them, two sets of voltage control units 16 are used for explanation. As shown in the third figure, the redundant control unit 120 series includes at least a DSP-1 control chip and a DSP-2 control chip, which are connected separately.

Page 10 1245479, Invention Description (7) Series II = Control Relay 161,-Second Voltage Control Unit 162. The logic early 14 series consists of two sets of inverse (νανγπ dike x point ^ > Yii, ^ yV eI ,, D) -circuits, whose outputs are respectively ^ ′ and are respectively connected to the transistors Q3 and Q4. Two settings, at the beginning: the exhaustion of the DSIM control chip is high-potentially reversed (NAWm controls the 1 / 0th round of the slice to be low-potential (L0), respectively, two, ΓΓ Π get x The point is a low potential (L.), and the point γ is a high potential. 1 6 1 The thunder π ^, the control system of the description is output voltage error signal VE by the first voltage control unit 16 1 and sent to the control voltage control. Unit. ❿ 第 1 懕 Λ 2, is short-circuited by the main number VE by Q4, and is a redundant voltage control unit. The gross voltage error signal is transmitted between the two voltage control units via serial communication *, which is combined with redundant voltage control. When the unit cannot receive the main control electric field, it will determine that the I / O output of the main control voltage control unit T2 chip is low potential (L0), Dsp_ output becomes high potential " n. " The point c is high potential (Hl) and the point Υ is low potential (Lo). The voltage error χ VE is generated by the redundant voltage control unit. The main control voltage is controlled by the Q3 short circuit. Will not affect the whole and contact: positive; $: E alum output plus Schottky diode is used as protection to avoid total 'The signal of a constant converter module is caused by backflow. Another reference is made to the fourth figure, which is a schematic circuit diagram of the control circuit of the multi-module converter of the present invention. Among them, the reset circuit 19 is connected to the solution. 18 and inverter module 2 are composed of at least ~ RC circuit and at least one thunder, and at the same time, the reset circuit 丨 9 is designed before inverter module 2 for

Page 11 1245479 _—_ V. Description of the invention (8) The reset (R e s e t) action of the converter module with embedded (P 1 u g-i η) abnormal action. Referring to the fourth figure, the operating principle of the reset circuit 19 is as follows: First, the time constant of R2C2 is appropriately selected to be about lms, the time constant of R1C1 is about 10ms, the time constant of R3C1 is about Is, and R3 > > R 1, so that < 0.7 V at steady state. When the converter module 2 is normal, the reset signal output by the decoding circuit 18 is a low potential (Lo). Because C1 is short-circuited and not charged at the instant of startup, transistor Q1 is turned on, but transistor Q2 is turned off ( of f), C2 is charged, the RST signal is at a high potential (Hi), and the reset circuit 19 has no effect. After C1 starts to charge, Q1 is turned off (of Ο. However, because the reset signal output by decoding circuit 18 is low potential (Lo), Q2 is still turned off (of f). The RST signal is still maintained at high potential (Hi) and reset Circuit 19 has no action. When inverter module 2 is abnormal, the reset signal output from decoding circuit 18 becomes high (Hi), C1 starts to charge, and Q1 will be cut off (of f) and Q2 after a period of time. On, at this time, C2 is discharged through Q2, so the RST signal becomes low potential (Lo), and a reset action is performed on the abnormal inverter module 2. As mentioned above, in the present invention, the redundancy is added. Redundancy voltage control unit to avoid the failure of the entire parallel system due to the failure of the main control voltage control unit. In addition, in order to flexibly adjust the capacity of the parallel system at any time, the parallel architecture proposed by the present invention has a hot-swap Hotswap function. In order to ensure the embedded (P1 ug- i η) converter module 2 during hot-swap operation

Page 12 1245479

1245479 on page 13-Brief description of the diagram (1) The first diagram is a block diagram of the control architecture of the multi-module inverter control system of the present invention; the second diagram is the circuit block of the multi-module inverter control system of the present invention A schematic diagram; a third diagram is a schematic diagram of a redundant voltage control circuit of the multi-module inverter control system of the present invention; and a fourth diagram is a schematic diagram of a reset circuit of the multi-module inverter control system of the present invention. (2) Description of drawing number 1 control system 1 2 control module 1 2 0 redundant control unit 12 2 reset control unit 1 4 logic unit 1 6 voltage control unit 161 first voltage control unit 16 2 second voltage control unit 1 8 Decoding circuit 1 9 Reset circuit 2 Converter module 3 Load Q, Q2, Q3, Q4 transistor DSP-Bu DSP-2 control chip

Page 14 1245479 Predicate simple description VE voltage error signal

IBI Page 15

Claims (1)

1245479-VI. Patent application scope 1. A multi-module inverter control system connected to at least one inverter module and a load, including: a control module connected to the inverter modules For processing digital signals for operation; a logic unit connected to the control module for performing logical operations on digital signals; at least one voltage control unit connected to the logic unit, the load and the converter modules To output a voltage error signal and a synchronization signal to the converter modules; a decoding circuit connected to the control module; and at least one reset circuit connected to the decoding circuit and connected to the converters respectively Device module. 2. The multi-module converter control system as described in item 1 of the scope of patent application, wherein the control module includes: a redundant control unit connected to the logic unit and transmitting a control signal to the logic A unit for driving the voltage control units; and a reset control unit, connected to the decoding circuit and the inverter modules, receiving an abnormal signal and outputting a decoding signal. 3. The multi-module inverter control system described in item 1 of the scope of patent application, wherein the voltage control units are divided into a main control voltage control unit and at least one output voltage based on the voltage error signal and the output of the synchronization signal. A redundant voltage control unit. 4 · Multi-module inverter control system as described in item 1 of the scope of patent application, Page 16 1245479-VI. Patent Application Scope The logic unit is used as the inverse (NAND) logic operation. 5. The multi-module inverter control system according to item 1 of the scope of patent application, wherein the reset circuits are composed of at least one RC circuit and at least one transistor. 6. The multi-module inverter control system as described in item 1 of the scope of the patent application, wherein the reset circuits are respectively connected to the inverter modules and are based on a reset signal transmitted by the decoding circuit. Used for resetting the converter modules. 7. The multi-module inverter control system as described in item 1 of the scope of patent application, The converter modules are composed of a current weighted distributed control circuit, a current controller and a power stage. 8. A multi-module inverter control system connected to at least one inverter module and a load, including: at least one voltage control unit connected to the load, the inverter modules and a The logic unit outputs a voltage error signal and a synchronization signal to the inverter modules; a redundant control unit connected to the logic unit transmits a control signal to the logic unit to drive the voltages control unit; A reset control unit, connected to a decoding circuit and the converter modules, receives an abnormal signal and outputs a decoding signal to the decoding circuit; at least one reset circuit is connected to the decoding circuit and the converters The converter module is based on a reset signal transmitted by the decoding circuit for resetting the converter modules. Page 1245479-VI. Patent application scope 9. The multi-module inverter control system as described in item 8 of the patent application scope, wherein the voltage control units are based on the voltage error signal and the output of the synchronization signal , Divided into a main control voltage control unit and at least one redundant voltage control unit. 10. The multi-module inverter control system as described in item 8 of the scope of the patent application, wherein the logic unit is used as a NAND logic operation. 1 1. The multi-module inverter control system according to item 8 of the scope of patent application, wherein the reset circuits are composed of at least one RC circuit and at least one transistor. 12. The multi-module converter control system according to item 8 of the scope of patent application, wherein the converter modules are composed of a current weighted distribution control circuit, a current controller, and a power stage.