CN109828177B - Fault wave recording device of direct current system - Google Patents
Fault wave recording device of direct current system Download PDFInfo
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Abstract
The utility model relates to a direct current system's trouble record wave system, including record wave storage unit, sample hold unit and filtering tank circuit, record wave storage unit's power input is connected with power supply unit through filtering tank circuit, record wave storage unit's first interface is connected with power supply unit's output, record wave storage unit's second interface is connected with sample hold unit's first interface, sample hold unit passes through another one and is connected with the device that provides the electric energy for sample hold unit, filtering tank circuit passes through several detection circuit and is connected with direct current busbar and charger output respectively. The problem that most of the current online monitoring equipment has no fault wave recording function or the wave recording function is influenced by a power supply and the integrity cannot be guaranteed can be effectively solved through the scheme. The circuit has simple structure and low cost. The application also provides a fault wave recording method of the system.
Description
Technical Field
The application relates to a fault wave recording device of a direct current system, and relates to the technical field of fault wave recording.
Background
The direct current power supply system which is one of important components of the power system provides direct current power supply for signal equipment, relay protection, automatic devices, accident lighting and circuit breaking parts and switching-on operation of a transformer substation, and ensures that the backup power supply continuously provides the important equipment of the direct current power supply under the condition of external alternating current faults, is the basic guarantee of normal actions of equipment such as relay protection, automatic devices and circuit breakers, and the like, and the stable operation of the direct current power supply system is very important for preventing system damage, accident expansion and serious damage to the equipment.
In recent years, under the condition that a direct current system of a transformer substation is abnormal, an accident that a protection device is in misoperation or refused to operate appears in an electric power system, and in an accident state, an external direct current or alternating current power grid cannot supply power to monitoring equipment, so that accurate and detailed information cannot be captured in the abnormal condition, data required by accident analysis is lacking, and the difficulty is increased for accident cause analysis.
At present, after a domestic direct current system fails, reliable data are not available for failure analysis, because most of the current online equipment is powered on a storage battery or an in-station alternating current power supply, once direct current power failure or alternating current power failure occurs, protection failure or misoperation event occurs, and meanwhile, the online equipment generally has the situation of failure and no work, so that the data before the failure cannot be recorded and analyzed. Although some wave recording devices using dry batteries as backup power sources also appear, the performance of the wave recording devices can gradually decrease with the time, and the wave recording requirements cannot be met.
Disclosure of Invention
One of the purposes of the application is to provide a fault wave recording device of a direct current system, which is used for solving the problems that the existing direct current system is mainly powered on a storage battery or an in-station alternating current power supply due to the current on-line equipment, and the on-line equipment generally can not work due to the fact that the on-line equipment is powered down when protection refusing or misoperation event occurs once direct current power failure or alternating current power failure occurs, so that data before faults cannot be recorded and analysis is provided.
In order to solve the problems, the invention adopts the following technical scheme:
a fault wave recording device of a direct current system comprises a wave recording storage unit, a sampling and holding unit and a filtering energy storage circuit;
the power input end of the wave recording storage unit is connected with the power supply device through the filtering energy storage circuit and is used for acquiring electric energy from the power supply device;
the first interface of the wave recording storage unit is connected with the output end of the power supply device and is used for sampling the voltage value of the output end;
the second interface of the wave recording storage unit is connected with the first interface of the sample hold unit and is used for carrying out data transmission with the sample hold unit;
the sampling and holding unit is connected with a device for providing electric energy for the sampling and holding unit through another filtering energy storage circuit;
the filtering energy storage circuit is connected with the output ends of the direct current bus and the charger respectively through a plurality of detection circuits and is used for sampling electric quantity data from the direct current bus and the charger.
The sampling and holding unit comprises an STM32F407ZGT6 microprocessor and an AD7682BCPZ analog-to-digital conversion chip, and is used for sampling the voltage of a direct current bus, the current of the direct current bus, the voltage of the direct current bus to the ground, the alternating current serial-in voltage of the direct current bus and the output current of a charger in real time and dynamically storing voltage and current sampling data of at least 1 s;
the wave recording storage unit comprises an STM32F429ZGT6A microprocessor and a W9825G6KH-6I storage chip, and is used for processing and storing the data sent by the sample hold unit.
The detection circuits comprise a direct current bus voltage sampling circuit, a direct current bus current sampling circuit, a direct current bus alternating current serial sampling circuit and a charger current sampling circuit.
The DC bus voltage sampling circuit mainly comprises an AD8638ARJZ-R2 operational amplifier, a resistor and a capacitor, wherein the input end of the DC bus voltage sampling circuit is connected with a DC bus, and the output end of the DC bus voltage sampling circuit is connected with an analog-to-digital conversion chip and is used for collecting voltage signals of the DC bus;
the direct current bus current sampling circuit mainly comprises an AD8638ARJZ-R2 operational amplifier, a 7840 isolation amplifier and an AD8552 operational amplifier, wherein bus current signals are input from the AD8638ARJZ-R2 operational amplifier, output from the AD8552 operational amplifier after passing through the 7840 isolation amplifier and are sent to an analog-digital conversion chip, and the analog-digital conversion chip is used for collecting current signals of a direct current bus;
the DC bus AC serial sampling circuit mainly comprises an AD8638ARJZ-R2 operational amplifier, a resistor and a capacitor, wherein the input end of the DC bus AC serial sampling circuit is connected with the DC bus, and the output end of the DC bus AC serial sampling circuit is connected with the analog-to-digital conversion chip and is used for collecting voltage signals of the DC bus AC serial input;
the charger current sampling circuit mainly comprises two AD8638ARJZ-R2 operational amplifiers, a resistor and a capacitor, wherein the charger current enters from a first amplifier, is output from a second amplifier and is sent to an analog-to-digital conversion chip, and the charger current is used for collecting output current signals of the charger.
The technical scheme provided by the application can effectively solve the problem that most of the current online monitoring equipment has no fault wave recording function or the wave recording function is affected by a power supply and cannot ensure the integrity, has the fault wave recording function and can store complete wave recording data. The circuit has simple structure and low cost. The wave recording method is scientific and reliable, can store data information before and after the fault for a period of time, and provides reading for operators so as to diagnose the fault more efficiently, troubleshoot the fault and improve the working efficiency.
Drawings
FIG. 1 is an overall block diagram of a system according to an embodiment of the present application;
FIG. 2 is a circuit diagram of a DC bus voltage sampling circuit in an embodiment of the present application;
FIG. 3 is a DC bus current sampling circuit in an embodiment of the present application;
FIG. 4 is a schematic diagram of a DC bus AC serial sampling circuit according to an embodiment of the present application;
fig. 5 is a battery charger current sampling circuit in an embodiment of the present application.
FIG. 6 is an equivalent analog circuit of a DC system;
fig. 7 is a voltage waveform diagram at the time of failure.
Detailed Description
For the purposes, technical solutions and advantages of the embodiments of the present application, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to fig. 1 to 7 of the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the present application. Accordingly, the following detailed description of the embodiments of the present application, provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the present application.
As shown in FIG. 1, a fault wave recording device of a DC system comprises a wave recording storage unit, a sample hold unit and a filter energy storage circuit. The power input end of the wave recording storage unit is connected with the power supply device through the filtering energy storage circuit and is used for acquiring electric energy from the power supply device. The first interface of the wave recording storage unit is connected with the output end of the power supply device and is used for sampling the voltage value of the output end. The second interface of the wave recording storage unit is connected with the first interface of the sample hold unit and is used for carrying out data transmission with the sample hold unit. The sample-and-hold unit is connected to the means for supplying the sample-and-hold unit with electrical energy via a further filter tank circuit. The filtering energy storage circuit is respectively connected with the direct current bus and the output end of the charger through a plurality of detection circuits and is used for sampling electric quantity data from the direct current bus and the charger. The sample hold unit comprises an STM32F407ZGT6 microprocessor and an AD7682BCPZ analog-to-digital conversion chip, and is used for sampling the voltage of a direct current bus, the current of the direct current bus, the voltage of the direct current bus to the ground, the alternating current serial-in voltage of the direct current bus and the output current of a charger in real time and dynamically storing voltage and current sampling data of at least 1 s. The wave recording storage unit comprises an STM32F429ZGT6A microprocessor and a W9825G6KH-6I storage chip, and is used for processing and storing the data sent by the sample hold unit.
As shown in fig. 2-5, the plurality of detection circuits include a dc bus voltage sampling circuit, a dc bus current sampling circuit, a dc bus ac serial sampling circuit, and a charger current sampling circuit. The DC bus voltage sampling circuit mainly comprises an AD8638ARJZ-R2 operational amplifier, a resistor and a capacitor, wherein the input end of the DC bus voltage sampling circuit is connected with the DC bus, and the output end of the DC bus voltage sampling circuit is connected with the analog-to-digital conversion chip and is used for collecting voltage signals of the DC bus. The DC bus current sampling circuit mainly comprises an AD8638ARJZ-R2 operational amplifier, a 7840 isolation amplifier and an AD8552 operational amplifier, wherein bus current signals are input from the AD8638ARJZ-R2 operational amplifier, output from the AD8552 operational amplifier after passing through the 7840 isolation amplifier and are sent to an analog-digital conversion chip, and the analog-digital conversion chip is used for collecting current signals of a DC bus. The DC bus AC serial sampling circuit mainly comprises an AD8638ARJZ-R2 operational amplifier, a resistor and a capacitor, wherein the input end of the DC bus AC serial sampling circuit is connected with the DC bus, and the output end of the DC bus AC serial sampling circuit is connected with the analog-to-digital conversion chip and is used for collecting voltage signals of the DC bus AC serial. The charger current sampling circuit mainly comprises two AD8638ARJZ-R2 operational amplifiers, a resistor and a capacitor, wherein the charger current enters from the first amplifier, is output from the second amplifier and is sent to the analog-to-digital conversion chip, and is used for collecting a charger output current signal.
Specifically, as shown in fig. 1, the filter tank circuit is composed of diodes D1 and D2, and tank inductors L1, C2, and C3. The v+ power supply path of the power supply device (external power supply) is a diode D1, energy storage inductors L1, C1 and C3 are ceramic chip capacitors, and C2 is a super capacitor. In the case of a loss of direct current or alternating current, the power supply means (external power supply) v+, V-are disabled, and since D1, D2 are turned off in reverse, L1 and C1, C2, C3 are used as power sources to supply power to the device. The filter tank circuit is provided with two sets, one set is used for supplying power to the wave recording storage unit and the other set is used for supplying power to the sample and hold unit, and for convenience of reading, the filter tank circuit of the sample and hold unit is not shown in fig. 1, but it should be understood that the filter tank circuit and the filter tank circuit are both of the same structure and function. The filtering energy storage circuit maintains the sampling and transmission of the voltage and current of the direct current (storage battery) bus, the voltage to the ground and the alternating voltage to the ground of the sampling and holding unit, and saves the data into a file. On the other hand, after the wave recording storage unit monitors that the outside is powered down, the monitoring method is that the voltage of the V+ terminal is monitored through the ADC, if the voltage is lower than 80% of the normal value, the file system is stopped to be used immediately after the alarm or wave recording file is written, and the wave recording file is prevented from being damaged or incomplete.
The sampling and holding unit is mainly used for collecting the voltage and the current of a direct current bus through an ADC, outputting the voltage and the current of a charger, keeping 1S sampling data at the current moment, transmitting the 1S data to the wave recording storage unit together when the direct current or alternating current is in power failure when a fault occurs, and continuously executing the sampling 41S without distinguishing whether the current or the voltage exists on the bus of the storage battery, and taking the current or the voltage as the basis of subsequent fault analysis.
The fault wave recording method for the direct current system by the fault wave recording system of the direct current system comprises the following steps:
s1, the wave recording storage unit monitors an output voltage value of a power supply device for providing electric energy for the wave recording storage unit in real time;
s2, the sampling and holding unit samples the voltage of the direct current bus, the current of the direct current bus, the voltage of the direct current bus to the ground, the alternating current serial voltage of the direct current bus and the output current of the charger in real time, and at least dynamically stores 1S of voltage and/or current sampling data;
s3, when the sampling and holding unit detects that the voltage (positive polarity end or/and negative polarity end) of the direct current bus to the ground is lower than or equal to 73V, defining the moment as the fault occurrence moment;
from the fault occurrence time, the wave recording storage unit reads the sampling data 1s before the fault occurrence time from the sampling holding unit to be permanently stored, and meanwhile, the sampling data at least 41s after the fault occurrence time are still continuously read and permanently stored. The wave recording storage unit monitors in real time that the output voltage value of the power supply device for providing the wave recording storage unit with electric energy is lower than 80% of a normal value, and immediately stops using the file system after the alarm or wave recording file is written, so that the wave recording file is prevented from being damaged or incomplete.
The conventional device with the wave recording function usually only records data after the fault occurrence time, and only records 200ms before the fault occurrence time partially, however, through a great amount of experiments and field test summaries of the inventor, it is found that if a ground fault occurs in a direct current system, the voltage of the direct current system is reduced to an industry grounding requirement value approximately in 1 s. As shown in fig. 6 and fig. 7, fig. 6 is an equivalent analog circuit of the dc system, in which the voltages of the positive and negative electrodes to the ground are in a balanced state under normal conditions, when the ground occurs, K1 is closed, the distributed capacitor C1 is discharged, C2 is charged, and the voltages of the positive and negative electrodes to the ground start to drop, as shown in the curved portion of the figure. Fig. 7 is a voltage waveform diagram at the time of failure, showing that 1s is required when the system voltage is lowered from 110V to 73V. Therefore, the device is required to record data at least 1s before the fault occurrence time, accurately record all data from the fault occurrence time to the voltage stabilization time, and provide diagnostic data for staff conveniently.
The technical scheme provided by the application can effectively solve the problem that most of the current online monitoring equipment has no fault wave recording function or the wave recording function is affected by a power supply and cannot ensure the integrity, has the fault wave recording function and can store complete wave recording data. The circuit has simple structure and low cost. The wave recording method is scientific and reliable, can store data information before and after the fault for a period of time, and provides reading for operators so as to diagnose the fault more efficiently, troubleshoot the fault and improve the working efficiency.
Claims (4)
1. The fault wave recording device of the direct current system is characterized by comprising a wave recording storage unit, a sampling and holding unit and a filtering energy storage circuit;
the power input end of the wave recording storage unit is connected with the power supply device through the filtering energy storage circuit and is used for acquiring electric energy from the power supply device;
the first interface of the wave recording storage unit is connected with the output end of the power supply device and is used for sampling the voltage value of the output end;
the second interface of the wave recording storage unit is connected with the first interface of the sample hold unit and is used for carrying out data transmission with the sample hold unit;
the sampling and holding unit is connected with a device for providing electric energy for the sampling and holding unit through another filtering energy storage circuit;
the sampling and holding unit is respectively connected with the output ends of the direct current bus and the charger through a plurality of detection circuits and is used for sampling electric quantity data from the direct current bus and the charger;
the filtering energy storage circuit is composed of diodes D1 and D2, energy storage inductors L1, C2 and C3, wherein C1 and C3 are ceramic chip capacitors, and C2 is a super capacitor; one end of the diode D1 is connected with the V+ end of the power supply device, the other end of the diode D1 is connected with the diode D2 and the energy storage inductor L1, the other end of the energy storage inductor L1 is connected with three C1, C2 and C3 which are connected in parallel, and the other end of the diode D2 is respectively connected with the V-end of the power supply device and the three C1, C2 and C3 which are connected in parallel; under normal conditions, the V+ power supply path of the power supply device is a diode D1 and an energy storage inductor L1, under the condition of direct current or alternating current power failure, the V+ and V-of the power supply device are disabled, and as D1 and D2 are reversely cut off, L1, C2 and C3 are used as power supplies for supplying power to equipment; the filtering energy storage circuit is provided with two sets, one set is used for supplying power to the wave recording storage unit, and the other set is used for supplying power to the sampling and holding unit; the filtering energy storage circuit maintains the sampling and the transmission of the sampling and holding unit to continue sampling and the transmission of the direct current bus voltage and current, the ground voltage and the ground alternating voltage on one hand, and saves the data into a file; on the other hand, after the wave recording storage unit monitors that the external power is lost, if the power is lower than 80% of the normal value, the file system is stopped to be used immediately after the alarm or wave recording file is written;
the wave recording storage unit reads the sampling data 1s before the fault occurrence time from the sampling hold unit to permanently store, and at the same time, the sampling data at least 41s after the fault occurrence time is still continuously read and permanently stored.
2. The fault logging device of a direct current system according to claim 1, wherein:
the sampling and holding unit comprises an STM32F407ZGT6 microprocessor and an AD7682BCPZ analog-to-digital conversion chip, and is used for sampling the voltage of a direct current bus, the current of the direct current bus, the voltage of the direct current bus to the ground, the alternating current serial-in voltage of the direct current bus and the output current of a charger in real time and dynamically storing voltage and current sampling data of at least 1 s;
the wave recording storage unit comprises an STM32F429ZGT6A microprocessor and a W9825G6KH-6I storage chip, and is used for processing and storing the data sent by the sample hold unit.
3. The fault logging device of a direct current system according to claim 2, wherein:
the detection circuits comprise a direct current bus voltage sampling circuit, a direct current bus current sampling circuit, a direct current bus alternating current serial sampling circuit and a charger current sampling circuit.
4. A fault logging device for a dc system according to claim 3, wherein:
the DC bus voltage sampling circuit mainly comprises an AD8638ARJZ-R2 operational amplifier, a resistor and a capacitor, wherein the input end of the DC bus voltage sampling circuit is connected with a DC bus, and the output end of the DC bus voltage sampling circuit is connected with an analog-to-digital conversion chip and is used for collecting voltage signals of the DC bus;
the direct current bus current sampling circuit mainly comprises an AD8638ARJZ-R2 operational amplifier, a 7840 isolation amplifier and an AD8552 operational amplifier, wherein bus current signals are input from the AD8638ARJZ-R2 operational amplifier, output from the AD8552 operational amplifier after passing through the 7840 isolation amplifier and are sent to an analog-digital conversion chip, and the analog-digital conversion chip is used for collecting current signals of a direct current bus;
the DC bus AC serial sampling circuit mainly comprises an AD8638ARJZ-R2 operational amplifier, a resistor and a capacitor, wherein the input end of the DC bus AC serial sampling circuit is connected with the DC bus, and the output end of the DC bus AC serial sampling circuit is connected with the analog-to-digital conversion chip and is used for collecting voltage signals of the DC bus AC serial input;
the charger current sampling circuit mainly comprises two AD8638ARJZ-R2 operational amplifiers, a resistor and a capacitor, wherein the charger current enters from a first amplifier, is output from a second amplifier and is sent to an analog-to-digital conversion chip, and the charger current is used for collecting output current signals of the charger.
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| CN110456269A (en) * | 2019-07-01 | 2019-11-15 | 许昌许继风电科技有限公司 | A kind of wind power pitch-controlled system failure wave-recording method and oscillograph |
| CN110401411B (en) * | 2019-08-14 | 2022-02-18 | 阳光电源股份有限公司 | Photovoltaic energy storage system and fault recording device |
| CN111398846A (en) * | 2020-04-07 | 2020-07-10 | 广州锦泊瑞智能设备有限公司 | Direct current system fault monitoring device and method |
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