Special processing device for power supply safety of signal machine room

Abstract

The utility model discloses a signal machinery room power supply safety special-purpose processing device, which relates to the power equipment field, and is characterized in that an AC input end is provided with a lightning protection module, so lightning stroke and transient voltage surge can be effectively absorbed, and peak interference can be isolated. The rectifying and filtering module rectifies alternating current into direct current, harmonic interference is reduced, stable direct current input is provided for subsequent modules, stable operation of the system is ensured, and the problem of voltage fluctuation of an input power grid is solved. DC voltage is stably output through a control strategy of a current inner loop and a voltage outer loop of the wide voltage stabilization module, so that generation of three-phase AC is realized and synchronous power supply with an external power grid is maintained. The DSP differential detection and control module monitors voltage and current changes in real time, carries out rapid protection on overvoltage, overcurrent and voltage peak values, monitors the phase of the other power supply and synchronizes the phase to the SPWM inversion part, so that the purpose that the phase of the output power supply and the phase of the other power supply are the same is achieved, and the problems of the same-phase phase difference and the voltage difference of two power grids are solved.

Description

Technical Field

[0001] The utility model relates to the field of electric power equipment, in particular to a special power safety processing device for a signal machinery room. Background Art

[0002] At present, due to environmental factors, the power supply for the signal machinery room of some rail lines has only one through line, and the other is taken from the rural power grid. The rural power grid lines are long and complex, and the load properties are changeable. Many areas are prone to lightning strikes, resulting in unstable power supply, frequent power grid fluctuations, power outages and other phenomena. In addition, some stations are unmanned stations. Due to the unstable quality of the incoming power supply, it is easy to cause signal equipment failures. In extreme cases, the incoming power supply is prone to double outages, which poses a major hidden danger to the safe operation of the railway. There is currently a generator as a backup for the second rural power grid signal power supply outside the through line. When the rural power grid is out of power, the generator is started and switched through the dual power supply as a backup power supply.

[0003] The voltage fluctuations in the above-mentioned power grid include short-term abnormal voltage mutations. In thunderstorms or when the first through-line is under maintenance, there is a certain probability that the signal power supply will be double-interrupted due to the uncontrollable second rural power grid. At the same time, no matter whether the second power supply is from the rural power grid or the generator, there is a phase difference and phase voltage difference with the voltage of the first through-line, which cannot meet the power supply standard of the signal power supply, increasing the failure probability of the signal power supply. Utility Model Content

[0004] The utility model aims to solve the problems of voltage fluctuation of input power grid, phase difference and voltage difference of two power grids by a special processing device for power supply safety in signal machinery room.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a signal machinery room power supply safety special processing device, including a lightning protection module connected to the two-way rural power grid, and a DSP differential detection and control module electrically connected to a class of through-lines, characterized in that: the output end of the lightning protection module is electrically connected to a clipping, peak clipping, and anti-interference module for eliminating transient voltage fluctuations and spike interference, and the output end of the clipping, peak clipping, and anti-interference module is electrically connected to a rectification and filtering module for rectifying and outputting direct current;

[0006] The output ends of the DSP differential detection and control module and the rectification and filtering module are electrically connected to a wide-range voltage stabilization module for voltage and current stability control. The wide-range voltage stabilization module consists of a PWM submodule for controlling output voltage and an SPWM submodule for controlling output current.

[0007] As a further description of the above technical solution: the clipping, peak clipping and anti-interference module includes a voltage surge LC absorption network for suppressing switch disconnection.

[0008] As a further description of the above technical solution: the rectification and filtering module includes a semiconductor diode used for rectifying single / three-phase alternating current into direct current.

[0009] As a further description of the above technical solution: the PWM submodule includes a control power supply circuit, an operational amplifier and sampling circuit, a pulse width modulation circuit, an IGBT driving circuit, an IGBT output circuit, a voltage and current feedback circuit, a sampling conversion circuit, and an over-current, over-voltage, and over-temperature protection and display circuit.

[0010] As a further description of the above technical solution: the voltage-current feedback circuit includes a current Hall sensor and a voltage Hall sensor for sampling the output end of the IGBT output circuit.

[0011] As a further description of the above technical solution: the SPWM submodule is directly controlled by the DSP differential detection and control module and drives multiple IGBT circuits, and feeds back the voltage, current and short-circuit signals of the multiple IGBT circuits to the DSP differential detection and control module.

[0012] As a further description of the above technical solution: the SPWM submodule is directly controlled by the DSP differential detection and control module to generate multiple direct current supplies of L1, L2 and L3.

[0013] As a further description of the above technical solution: when the DC output voltage of the PWM sub-module is over-voltage or the output current is detected as over-current by the current Hall sensor and the voltage Hall sensor, the over-current, over-voltage and over-temperature protection and display circuit sends a protection pulse to the IGBT control electrode of the IGBT drive circuit.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0015] This solution uses lightning protection module, wave clipping and peak clipping, anti-interference, rectification and filtering, wide voltage regulation and power supply monitoring functions. The system first sets up a lightning protection module at the AC input end, and effectively absorbs lightning strikes and transient voltage surges and isolates peak interference through lightning arresters, LC absorption networks, isolation transformers and shielded grounding technology. The rectification and filtering module rectifies AC power into DC power, reduces harmonic interference, and provides stable DC input for subsequent modules to ensure stable operation of the system and solve the problem of input grid voltage fluctuations.

[0016] The wide voltage stabilization module is composed of the inverter part formed by the PWM submodule and the SPWM submodule. The PWM submodule outputs a stable DC voltage through the control strategy of the current inner loop and the voltage outer loop, while the SPWM submodule is controlled by the DSP differential detection and control module to achieve the generation of three-phase AC power and maintain synchronous power supply with the external power grid. The DSP differential detection and control module also monitors the voltage and current changes in real time, and quickly protects against overvoltage, overcurrent and voltage peaks. The DSP differential detection and control module monitors the phase of the other power supply and synchronizes the phase to the SPWM inverter part, ultimately achieving the purpose of the output power supply being in phase with the other power supply, solving the problem of the same phase difference and voltage difference of the two power grids. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the system block diagram of the special processing device of the utility model;

[0018] Figure 2 This is a schematic diagram of the topological structure of the PWM submodule of the utility model;

[0019] Figure 3 This is the connection block diagram of the PWM submodule of the utility model;

[0020] Figure 4 This is a connection diagram of the SPWM submodule and the DSP differential detection and control module of the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the DSP differential detection and control module of the utility model;

[0022] Figure 6 This is a schematic diagram of the existing power supply architecture of the signal machinery room of the unmanned station;

[0023] Figure 7 This is a schematic diagram of Embodiment 1 of the present utility model;

[0024] Figure 8 This is a schematic diagram of the second embodiment of the present utility model;

[0025] Fig. 9 This is a schematic diagram of the third embodiment of the present utility model;

[0026] Fig.10 This is a schematic diagram of the fourth embodiment of the present utility model. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] like Figure 1 - Fig.10 As shown, the utility model provides: a signal machinery room power safety dedicated processing device, which is composed of a lightning protection module, a clipping, peak clipping, anti-interference module, a rectifier filter module, a DSP differential detection and control module, a wide voltage stabilization module, a direct supply and monitoring unit. The system framework is detailed in Figure 1 .

[0029] Among them, the lightning protection module uses a lightning arrester to connect to the AC input end. After power is connected, the cable incoming line is connected to the clipping, peak clipping and anti-interference module. The clipping, peak clipping and anti-interference module improves the lightning resistance level through the LC absorption network, boost isolation and shield grounding measures. The LC absorption circuit can suppress the voltage surge caused by the switch disconnection through its capacity, thereby protecting the circuit from the influence of transient voltage fluctuations. The boost isolation of the isolation transformer and its shield grounding can further eliminate the harm of spike interference to the equipment, thereby greatly improving the anti-interference performance of the signal machinery room power safety dedicated processing device.

[0030] The rectifier and filter module uses semiconductor diodes as rectifier tubes to rectify the single / three-phase AC power input after the clipping, peak clipping and anti-interference modules into DC, and supplies it to the lower-level modules. Among them, the output voltage changes in proportion to the input voltage by using semiconductor diodes, which can reduce harmonics and reduce pollution to the power grid.

[0031] The DC power output by the rectifier and filter module is connected to the wide-range voltage regulator module, which is composed of the inverter part of the PWM sub-module and the SPWM sub-module. At the same time, the DSP differential detection and control module monitors the phase of another power supply (this solution shows a through line) and synchronizes the phase of the power supply to the SPWM inverter part, ultimately achieving the purpose of making the output power supply in phase with the other power supply.

[0032] The wide voltage stabilization module is composed of the inverter part of the PWM submodule and the SPWM submodule. The PWM submodule converts the DC voltage (which changes with the input voltage) after rectification and filtering by the rectifier and filter module into a stable DC voltage. For details on the topology of the PWM submodule, see Figure 2 ;

[0033] See also Figure 3The PWM submodule adopts an automatic control scheme of current inner loop and voltage outer loop, including control power supply circuit, operational amplifier and sampling circuit, pulse width modulation circuit, IGBT driving circuit, IGBT output circuit, voltage and current feedback circuit, sampling conversion circuit and over-current, over-voltage and over-temperature protection and display circuit. The specific control principle is:

[0034] Multiple power sources are input simultaneously (including one through-line, two rural power grid signals and three overhead contact networks, etc.), which are converted into 5V, ±12V, 24V and other regulated control power sources through the control power circuit, and supply power to each control link of the PWM submodule;

[0035] The given voltage is input to the operational amplifier and sampling circuit through the given potentiometer. The operational amplifier and sampling circuit amplify the given voltage, and after pulse width modulation, the output voltage value of the PWM submodule is made 250~280V through the IGBT driving circuit and the IGBT output circuit to achieve the regulation of the given voltage;

[0036] The voltage and current feedback circuit includes a current Hall sensor and a voltage Hall sensor to sample the output end of the IGBT output circuit, and send the sampled data to the sampling conversion circuit, which is fed back to the operational amplifier and the sampling circuit through the sampling conversion circuit, and the output voltage is stably controlled by controlling the power supply circuit, and the dynamic quality of the power supply is greatly improved at the same time; more specifically, the output voltage stability control is: when the switching frequency is 20KHz, there are 400 rectangular pulses of equal height and equal sides in one cycle of 0.02 seconds; by controlling the power supply circuit to add control pulses of different widths to the IGBT control electrode of the IGBT driving circuit and the IGBT output circuit, the different on-off times of the IGBT tube can be controlled, and the DC voltage can be cut into pulses of different widths to achieve chopping output. The output voltage can be changed by adjusting and changing the width of the pulse. When the external voltage increases, the control pulse quickly narrows; when the external voltage decreases, the control pulse widens, thereby ensuring the stability of the output voltage.

[0037] The specific principles for achieving stable control of the output voltage by controlling the power supply circuit include:

[0038] When the DC output voltage of the PWM submodule is over-voltage, the feedback voltage detected by the Hall voltage sensor of the voltage and current feedback circuit passes through the over-voltage and over-temperature protection and display circuit, and quickly sends a protection pulse to the IGBT driving circuit and the IGBT control electrode of the IGBT output circuit, while blocking the pulse modulation circuit and the IGBT driving circuit;

[0039] When the DC output voltage of the PWM sub-module is overcurrent, the feedback current detected by the current Hall sensor is processed by the sampling conversion circuit and sent to the operational amplifier and sampling circuit, and the current data fed back in real time by the current Hall sensor of the voltage and current feedback circuit controls the current within the allowable range. When the voltage and current feedback circuit fails, the overcurrent signal is used to control the power supply circuit to quickly send a protection pulse to the IGBT control electrode of the IGBT drive circuit and the IGBT output circuit, and at the same time block the pulse modulation circuit and the IGBT drive circuit.

[0040] In summary, stable control of the output voltage is achieved.

[0041] Detect the IGBT tube voltage drop of the IGBT driving circuit or the IGBT output circuit as the voltage peak signal. When the IGBT tube voltage drop is too high, directly use the protection circuit in the driving pole of the IGBT driving circuit or the IGBT output circuit to quickly turn off the control pulse of the IGBT, thereby realizing the protection control of the voltage peak.

[0042] See also Figure 4 , the detailed circuit diagram of the wide-range voltage stabilization module and the connection relationship between the DSP differential detection and control module, the AC power processed by the lightning protection module and the clipping, peak clipping, and anti-interference modules is rectified and filtered, and then input into the wide-range voltage stabilization module, as well as see Figure 5 In the structural block diagram of the DSP differential detection and control module, it can be seen that the optocoupler isolation circuit of the SPWM submodule is directly controlled by the DSP differential detection and control module and sends out three-phase SPWM pulses to drive the IGBT circuits of multiple PWM submodules (a circuit system composed of insulated gate bipolar transistors (IGBT) as core devices), driving and simultaneously feeding back the voltage, current and short-circuit signals of multiple IGBT circuits to the DSP differential detection and control module, see Figure 5 , the voltage, current and short-circuit signal feedback of multiple IGBT circuits are sent to the DSP differential detection and control module. The DSP differential detection and control module sends out three-phase SPWM pulses to convert the AC 50Hz power supply into DC load power supply through the bridge inverter circuit of the PWM submodule, and generates a variety of 5V, ±12V, 24V and other regulated control power supplies corresponding to L1, L2 and L3. The overall advantages are low switching loss, small harmonic components, convenient and reliable implementation, and less DSP resource occupation.

[0043] In summary, this solution has functions such as lightning protection module, wave clipping and peak clipping, anti-interference, rectification and filtering, wide-range voltage regulation and power supply monitoring. The system first sets up a lightning protection module at the AC input end, and effectively absorbs lightning strikes and transient voltage surges and isolates spike interference through lightning arresters, LC absorption networks, isolation transformers and shielded grounding technology. The rectification and filtering module rectifies AC power into DC power, reduces harmonic interference, and provides a stable DC input for subsequent modules. The wide-range voltage regulation module is divided into two parts: PWM and SPWM. The PWM submodule outputs DC voltage stably through the control strategy of the current inner loop and the voltage outer loop, while the SPWM submodule is controlled by the DSP differential detection and control module to achieve the generation of direct power supply and maintain synchronous power supply with the external power grid. The DSP differential detection and control module also monitors voltage and current changes in real time, and quickly protects against overvoltage, overcurrent and voltage peaks to ensure stable operation of the system.

[0044] like Figure 6 As shown in the figure, the existing power supply architecture of the signal machinery room of the unmanned site includes a through line electrically connected to the machinery signal room, and two rural power grids and two generators electrically connected to the machinery signal room in parallel. Based on this, multiple implementation scenarios of the dedicated processing device of this solution are proposed: Example

[0045] like Figure 7 As shown, the existing power supply architecture is maintained unchanged, and the special safety processing device is connected in series between the input distribution box and the signal power supply. The special safety processing device purifies and stabilizes the input power supply to provide high-quality power to the signal power supply. At the same time, the same phase of the two input power supplies is corrected to meet the iron standard requirements of the signal power supply. The input end of the equipment is connected to the two-way outlet of the input distribution box, and the power supply of the output end of the equipment is introduced into the two-way input port of the signal power supply. The special safety processing device of the signal machinery room power supply simultaneously monitors the phase of the I power supply. Example

[0046] like Figure 8 As shown, the safety dedicated processing device is equipped with UPS function and a battery pack is added. When the second rural power supply fails, the battery pack will be used to supply power, and then the station will manually start the generator and then switch to the generator to ensure that the signal power panel is in normal working condition. Example

[0047] like Fig. 9 As shown, the contact network power supply is transformed and introduced into the signal machinery room at the same time. The two-way rural grid and the contact network are input into the signal machinery room power safety dedicated processing device in a dual-power supply mode. Through the parallel technology, when any one of the two-way rural grid and the contact network power supply is powered, the power supply output by the signal machinery room power safety dedicated processing device to the signal power supply panel is uninterrupted, ensuring the normal operation of the signal power supply. Example

[0048] like Fig.10 As shown, the dedicated processing device is directly connected in series to the two power supplies of the input distribution box and the signal power supply.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dedicated power safety processing device for the signal machinery room, including a lightning protection module connected to the two-way rural power grid, and a DSP differential detection and control module connected to a type of through-line power, characterized in that: The output end of the lightning protection module is electrically connected to a clipping, peak clipping, and anti-interference module for eliminating transient voltage fluctuations and spike interference, and the output end of the clipping, peak clipping, and anti-interference module is electrically connected to a rectification and filtering module for rectifying and outputting direct current; The output ends of the DSP differential detection and control module and the rectification and filtering module are electrically connected to a wide-range voltage stabilization module for voltage and current stability control, and the wide-range voltage stabilization module is composed of a PWM submodule for controlling the output voltage and an SPWM submodule for controlling the output current; The PWM submodule includes a control power supply circuit, an operational amplifier and sampling circuit, a pulse width modulation circuit, an IGBT driving circuit, an IGBT output circuit, a voltage and current feedback circuit, a sampling conversion circuit, and an over-current, over-voltage, and over-temperature protection and display circuit.

2. The signal machine room power supply safety dedicated processing device according to claim 1 is characterized in that: The wave clipping, peak clipping and anti-interference module includes an LC absorption network for suppressing voltage surges when power is switched on and off.

3. The signal machine room power supply safety dedicated processing device according to claim 1 is characterized in that: The rectification and filtering module includes a semiconductor diode used for rectifying single-phase / three-phase alternating current into direct current.

4. The signal machine room power safety dedicated processing device according to claim 1 is characterized in that: The voltage-current feedback circuit includes a current Hall sensor and a voltage Hall sensor for sampling the output end of the IGBT output circuit.

5. The signal machine room power safety dedicated processing device according to claim 1 is characterized in that: The SPWM submodule is directly controlled by the DSP differential detection and control module and drives multiple IGBT circuits, and feeds back the voltage, current and short-circuit signals of the multiple IGBT circuits to the DSP differential detection and control module.

6. The signal machine room power supply safety dedicated processing device according to claim 5 is characterized in that: The SPWM submodule is directly controlled by the DSP differential detection and control module to generate multiple direct current supplies of L1, L2 and L3.

7. The signal machine room power safety dedicated processing device according to claim 4 is characterized in that: When the DC output voltage of the PWM submodule is overvoltage or the output current is detected as overcurrent by the current Hall sensor and the voltage Hall sensor, the overcurrent, overvoltage and overtemperature protection and display circuit sends a protection pulse to the IGBT control electrode of the IGBT driving circuit.

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