CN110736890B - Power distribution network data safety early warning system - Google Patents
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Abstract
The invention discloses a power distribution network data safety early warning system which comprises a first voltage acquisition circuit, a second voltage acquisition circuit, a delay comparison circuit and a filtering transmitting circuit, wherein the first voltage acquisition circuit acquires the data signal voltage of a power distribution network main node, the second voltage acquisition circuit acquires the data signal voltage of a power distribution network branch node, a time delay circuit consisting of a triode Q5 and a capacitor C4 is used for delaying the output signal of the second voltage acquisition circuit, an operational amplifier AR3, an operational amplifier AR4, a diode D8 and a diode D9 are used for screening out an average value signal and inputting the average value signal into the reverse phase input end of the operational amplifier AR5, the operational amplifier AR5 performs subtraction processing on the signal, the operational amplifier AR6 compares the signal and inputs the signal into the filtering transmitting circuit, the filtering transmitting circuit consisting of an inductor L1, a capacitor C6 and a capacitor C7 is used for filtering and then transmits the signal into an early warning module of a power distribution network through a signal transmitter E1, the effect of improving the data safety early warning of the power distribution network is achieved.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a power distribution network data safety early warning system.
Background
At present, a power distribution network data management system mainly uses data signal security encryption of a main node and subordinate branch nodes to realize data security protection, however, since the subordinate branch nodes are distributed in each county or town and are data processors of the power distribution network of each county or town, the main node receives data of each branch node, the main node is a control management terminal of the power distribution network, and data signals of the branch nodes are not only guaranteed to be free from leakage due to external factors, but also guaranteed to be tampered by internal staff, according to a power grid data security protection method and a distributed power grid data security protection system with the prior art patent number of 201811250464.2, once data signals are tampered, data traces are left, that is, the amount of the data signals is increased, when the amount of the data signals is increased, carrier power of the data signals is correspondingly increased, the prior art discloses a technology for preventing data signal leakage caused by external factors, and does not consider the factor of internal staff tampering with the data signal.
Disclosure of Invention
In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a power distribution network data safety early warning system, which can detect the voltage of the power distribution network master node and the sub-node data signals in real time, and convert the detected signals into power distribution network data safety early warning signals after comparing and adjusting the detected signals.
The technical scheme for solving is that the power distribution network data safety early warning system comprises a first voltage acquisition circuit, a second voltage acquisition circuit, a delay comparison circuit and a filtering transmitting circuit, wherein the first voltage acquisition circuit acquires the data signal voltage of a power distribution network main node, the second voltage acquisition circuit acquires the data signal voltage of the power distribution network sub-node, the delay comparison circuit utilizes an operational amplifier AR1, an operational amplifier AR2 and a diode D5-diode D7 to form a peak detection circuit, the peak signal of the output signal of the first voltage acquisition circuit is screened and input into an in-phase input end of the operational amplifier AR5, meanwhile, a time delay circuit composed of a triode Q5 and a capacitor C4 is utilized to delay the output signal of the second voltage acquisition circuit, and the average signal composed of the operational amplifier AR3, the operational amplifier AR4, the diode D8 and the diode D9 is screened and input into an anti-phase input end of the operational amplifier AR5, the operational amplifier AR5 performs subtraction processing on the signals, wherein a triode Q6 detects the potential difference of the output signals of the operational amplifier AR4 and the operational amplifier AR1, a feedback signal is fed into the reverse-phase input end of the operational amplifier AR6, a triode Q7 detects the potential difference of the output signals of the operational amplifier AR5 and the operational amplifier AR4, the feedback signal is fed into the non-phase input end of the operational amplifier AR2, finally the operational amplifier AR6 compares the signals and inputs the signals into a filtering and transmitting circuit, and the filtering and transmitting circuit uses a filter circuit formed by an inductor L1, a capacitor C6 and a capacitor C7 to filter and then transmits the signals into a power distribution network early warning module through a signal transmitter E1.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages;
1. a time delay circuit consisting of a triode Q5 and a capacitor C4 is used for delaying the output signal of the second voltage acquisition circuit and processing the signal in a time delay way, so as to ensure the synchronism of the signal, and an average value circuit consisting of an operational amplifier AR3, an operational amplifier AR4, a diode D8 and a diode D9 is used for screening out an average value signal and inputting the average value signal into an inverting input end of an operational amplifier AR 5;
2. the triode Q6 detects the potential difference of the output signals of the operational amplifier AR4 and the operational amplifier AR1, a feedback signal is fed back into the reverse phase input end of the operational amplifier AR6, the situation that the potential difference of the output signals of the operational amplifier AR6 is too large and the circuit is damaged is prevented, the potential difference of the output signals of the operational amplifier AR5 and the operational amplifier AR4 is detected by the triode Q7, the situation that the potential difference of the two is too small is avoided, and the signal is misjudged, therefore, the feedback signal is fed back into the in-phase input end of the operational amplifier AR2 and plays a role in compensating the signal, finally, the signal is sent to the distribution network early warning module through the signal transmitter E1 after being filtered by the filter circuit formed by the inductor L1, the capacitor C6 and the capacitor C7, when the data signal amount is abnormal, the signal transmitter E1 sends a signal to trigger the distribution network early warning module to give an alarm, otherwise, the distribution network early warning module does not work, and the effect of improving the data safety early warning of the distribution network is achieved.
Drawings
Fig. 1 is a circuit diagram of a delay comparison of a power distribution network data security early warning system according to the present invention.
Fig. 2 is a first voltage acquisition circuit diagram of a power distribution network data safety early warning system according to the present invention.
Fig. 3 is a second voltage acquisition circuit diagram of the power distribution network data safety early warning system according to the present invention.
Fig. 4 is a filter transmitting circuit diagram of a power distribution network data safety early warning system according to the present invention.
Detailed Description
The foregoing and other aspects, features and advantages of the invention will be apparent from the following more particular description of embodiments of the invention, as illustrated in the accompanying drawings in which reference is made to figures 1 to 4. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
A power distribution network data safety early warning system comprises a first voltage acquisition circuit, a second voltage acquisition circuit, a delay comparison circuit and a filtering transmitting circuit, wherein the first voltage acquisition circuit acquires the data signal voltage of a power distribution network main node, the second voltage acquisition circuit acquires the data signal voltage of power distribution network branch nodes, the delay comparison circuit utilizes an operational amplifier AR1, an operational amplifier AR2 and a diode D5-diode D7 to form a peak detection circuit, the peak signal of the output signal of the first voltage acquisition circuit is screened and input into the non-inverting input end of the operational amplifier AR5, a time delay circuit composed of a triode Q5 and a capacitor C4 is utilized to delay the output signal of the second voltage acquisition circuit, and a mean value circuit composed of the operational amplifier AR3, the operational amplifier AR4, the diode D8 and the diode D9 is utilized to screen the mean value signal and input into the inverting input end of the operational amplifier AR5, the operational amplifier AR5 performs subtraction processing on the signal, the triode Q6 detects the potential difference of signals output by the inverse input end of the operational amplifier AR4 and the operational amplifier AR1, a feedback signal is fed into the inverse input end of the operational amplifier AR6, the triode Q7 detects the potential difference of signals output by the operational amplifier AR5 and the operational amplifier AR4, the feedback signal is fed into the in-phase input end of the operational amplifier AR2, finally the operational amplifier AR6 compares the signals and inputs the signals into the filtering and transmitting circuit, and the filtering and transmitting circuit uses an inductor L1, a capacitor C6 and a capacitor C7 to form a filtering circuit which is filtered and then is sent into the early warning module of the distribution network through a signal transmitter E1;
the delay comparison circuit uses an operational amplifier AR1, an operational amplifier AR2 and a diode D5-diode D7 to form a peak value detection circuit, a peak value signal of an output signal of the first voltage acquisition circuit is screened and input into a non-inverting input end of the operational amplifier AR5, a time delay circuit formed by a triode Q5 and a capacitor C4 is used for delaying an output signal of the second voltage acquisition circuit, the signal is delayed and processed, in order to ensure the synchronism of the signal, and a mean value circuit formed by the operational amplifier AR3, the operational amplifier AR4, the diode D8 and the diode D9 is used for screening a mean value signal and inputting into an inverting input end of the operational amplifier AR5, when a data signal is modified, the data potentials of a main node and a branch node are not very large, so that the potential difference between the main node and the branch node is a peak value signal, so that the potential difference between the main node and the branch node can be further enlarged, thereby improving the accuracy of judging the signal safety, the operational amplifier AR5 performs subtraction processing on the signals, wherein a triode Q6 detects the potential difference of the output signals of the operational amplifier AR4 and the operational amplifier AR1, a feedback signal is fed into the reverse phase input end of the operational amplifier AR6 to prevent the potential difference of the output signals of the operational amplifier AR6 from being too large and damage the circuit, a triode Q7 detects the potential difference of the output signals of the operational amplifier AR5 and the operational amplifier AR4 to prevent the potential difference of the output signals of the operational amplifier AR6 from being too small and make misjudgment of the signals, therefore, the feedback signal is fed into the non-phase input end of the operational amplifier AR2 to play a role of compensating the signals, and finally the operational amplifier AR6 compares the signals and inputs the signals into the filtering and transmitting circuit;
the specific structure of the time-delay comparison circuit is that the inverting input end of an operational amplifier AR1 is connected with the anode of a diode D5 and one end of a resistor R5, the output end of an operational amplifier AR1 is connected with the cathode of a diode D5, the anode of a diode D6 and the collector of a transistor Q6, the cathode of a diode D6 is connected with the anode of a diode D7 and one end of a resistor R6, the other end of the resistor R6 is connected with the other end of the resistor R6 and the inverting input end of the operational amplifier AR6, the non-inverting input end of the operational amplifier AR6 is connected with the cathode of the diode D6, one end of a capacitor C6 and the collector of the transistor Q6, the other end of the capacitor C6 is grounded, the base of the transistor Q6 is connected with the resistor R6, one end of the resistor R6 and the inverting input end of the operational amplifier AR6, the other end of the resistor R6 is connected with the inverting input end of the transistor R6, the emitter of the non-inverting input end of the transistor Q6 of the operational amplifier AR6, the transistor R6 and one end of the collector of the transistor R6, the base of the transistor Q5 is connected with the other end of the resistor R8 and one end of the capacitor C4, the other ends of the resistor R9 and the capacitor C4 are grounded, the output end of the operational amplifier AR3 is connected with the cathode of the diode D8 and the anode of the diode D8, the cathode of the diode D8 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with one end of the capacitor C8 and the non-inverting input end of the operational amplifier AR 8, the other end of the capacitor C8 is grounded, the output end of the operational amplifier AR 8 is connected with the other end of the resistor R8 and one end of the resistor R8, the other end of the resistor R8 is connected with one end of the resistor R8 and the inverting input end of the operational amplifier AR 8, the other end of the resistor R8 is connected with the base of the non-inverting input end of the transistor R8 and the non-inverting input end of the operational amplifier AR 8, the output end of the transistor R8 is connected with the non-inverting input end of the operational amplifier AR 8. The inverting input terminal of the operational amplifier AR6 is connected to one end of the resistor R17, and the other end of the resistor R17 is connected to the emitter of the transistor Q6.
On the basis of the scheme, the filter transmitting circuit uses an inductor L1, a capacitor C6 and a capacitor C7 to form a filter circuit, the filter circuit is filtered by the signal transmitter E1 and then is sent to the power distribution network early warning module, when the data signal quantity is abnormal, the signal transmitter E1 sends a signal to trigger the power distribution network early warning module to alarm, otherwise, the power distribution network early warning module does not work, one end of the inductor L1 is connected with one end of a resistor R18 and one end of a capacitor C6, the other end of the resistor R18 is connected with the output end of an operational amplifier AR6, the other end of the inductor L1 is connected with one end of the capacitor C7, one end of the resistor R19 and the negative electrode of a voltage regulator D10, the other ends of the capacitor C6 and the capacitor C7 are grounded, the positive electrode of the voltage regulator D10 is grounded, and the other end of the resistor R19 is connected with the signal transmitter E1.
On the basis of the scheme, the first voltage acquisition circuit acquires the main node data signal voltage of the power distribution network by using a voltage collector J1 with the model of PIM600MC, and simultaneously uses a triode Q1 and a triode Q2 to form a signal enhancement circuit to enhance signals, the second voltage acquisition circuit selects a voltage collector J2 with the model of PIM600MC to acquire the branch node data signal voltage of the power distribution network, and simultaneously uses a triode Q3 and a triode Q4 to form a signal enhancement circuit to enhance signals, the power supply end of the voltage collector J1 is connected with +5V, the grounding end of a voltage collector J1 is grounded, the output end of the voltage collector J1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R2 and the negative electrode of a voltage regulator D1, the positive electrode of the voltage regulator D1 is grounded, the other end of the resistor R2 is connected with the base electrode of a triode Q1, the collector of a triode Q1 is connected with the base electrode of a triode Q2 and the positive electrode of a diode D2, the emitter of the triode Q2 is connected with the emitter of the triode Q1, the cathode of the diode D2 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is connected with the collector of the triode Q2 and the non-inverting input end of the operational amplifier AR 1; the power supply end of the voltage collector J2 is connected with +5V, the grounding end of the voltage collector J2 is grounded, the output end of the voltage collector J2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with one end of a resistor R4 and the negative electrode of a voltage regulator D3, the positive electrode of the voltage regulator D3 is grounded, the other end of the resistor R4 is connected with the base electrode of a triode Q3, the collector electrode of the triode Q3 is connected with the base electrode of a triode Q4 and the positive electrode of a diode D4, the emitter electrode of the triode Q3 is connected with the emitter electrode of a triode Q4, the negative electrode of the diode D4 is connected with one end of a capacitor C2, and the other end of the capacitor C2 is connected with the collector electrode of a triode Q4 and the collector electrode of a triode Q5.
When the invention is used in particular, the power distribution network data safety early warning system comprises a first voltage acquisition circuit, a second voltage acquisition circuit, a delay comparison circuit and a filtering transmitting circuit, wherein the first voltage acquisition circuit acquires the data signal voltage of a power distribution network main node, the second voltage acquisition circuit acquires the data signal voltage of the power distribution network sub-node, the delay comparison circuit uses an operational amplifier AR1, an operational amplifier AR2 and a diode D5-diode D7 to form a peak value detection circuit, the peak value signal of the output signal of the first voltage acquisition circuit is screened and input into the non-inverting input end of the operational amplifier AR5, a time delay circuit consisting of a triode Q5 and a capacitor C4 is used to delay the output signal of the second voltage acquisition circuit, the signal is delayed and processed, so as to ensure the signal synchronism, and the average value circuit consisting of the operational amplifier AR3, the operational amplifier AR4, the diode D8 and the diode D9 is used to screen out the average value signal and input into the inverting input end of the operational amplifier AR5, when the data signal is modified, the data potentials of the main node and the branch node are not very large, so the potential difference between the main node and the branch node needs to be enlarged, the main node is a peak value signal, the branch node is an average value signal, the potential difference between the main node and the branch node can be further enlarged, so the accuracy of judging the signal safety is improved, the operational amplifier AR5 performs subtraction processing on the signal, wherein the triode Q6 detects the potential difference of the output signals of the operational amplifier AR4 and the operational amplifier AR1, feeds back a signal to the reverse phase input end of the operational amplifier AR6, prevents the potential difference of the output signal of the operational amplifier AR6 from being too large and damaging the circuit, and the triode Q7 detects the potential difference of the output signals of the operational amplifier AR5 and the operational amplifier AR4, prevents the potential difference of the two from being too small and causing misjudgment, therefore the feedback signal is fed to the non-phase input end of the operational amplifier AR2 to play a role of compensating signal, and finally the operational amplifier AR6 compares the signal and inputs the filtered transmitting circuit, the filtering transmitting circuit comprises an inductor L1, a capacitor C6 and a capacitor C7, and is filtered by a signal transmitter E1 and then sent to the power distribution network early warning module.
While the invention has been described in further detail with reference to specific embodiments thereof, it is not intended that the invention be limited to the specific embodiments thereof; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.
Claims (4)
1. A power distribution network data safety early warning system comprises a first voltage acquisition circuit, a second voltage acquisition circuit, a delay comparison circuit and a filtering transmitting circuit, and is characterized in that the first voltage acquisition circuit acquires the data signal voltage of a power distribution network main node, the second voltage acquisition circuit acquires the data signal voltage of power distribution network node, the delay comparison circuit uses an operational amplifier AR1, an operational amplifier AR2, a diode D5 and a diode D7 to form a peak detection circuit, the peak signal of the output signal of the first voltage acquisition circuit is screened and input into the non-inverting input end of the operational amplifier AR5, a time delay circuit is formed by a triode Q5 and a capacitor C4 to delay the output signal of the second voltage acquisition circuit, and the operational amplifier AR3, the operational amplifier AR4, the diode D8 and the diode D9 are used to form an average circuit, the average signal is screened and input into the inverting input end of the operational amplifier AR5, the operational amplifier AR5 performs subtraction processing on the signals, wherein a triode Q6 detects the potential difference of the output signals of an operational amplifier AR4 and an operational amplifier AR1, a feedback signal is sent into the reverse-phase input end of the operational amplifier AR6, a triode Q7 detects the potential difference of the output signals of the operational amplifier AR5 and the operational amplifier AR4, the feedback signal is sent into the non-phase input end of the operational amplifier AR2, an operational amplifier AR6 compares the difference value of the peak signal and the average signal output by the operational amplifier AR5 with the potential difference of the output signals of the operational amplifier AR4 and the output signals of the operational amplifier AR1 fed back by the triode Q6, the operational amplifier AR6 finally outputs a comparison signal into a filtering and transmitting circuit, and the filtering and transmitting circuit consists of an inductor L1, a capacitor C6 and a capacitor C7 and sends the filtered signal into a distribution network early warning module by a signal transmitter E1;
the delay comparison circuit comprises an operational amplifier AR1, wherein the inverting input terminal of the operational amplifier AR1 is connected with the anode of a diode D5 and one end of a resistor R5, the output terminal of the operational amplifier AR1 is connected with the cathode of a diode D5, the anode of a diode D6 and the collector of a transistor Q6, the cathode of the diode D6 is connected with the anode of the diode D6 and one end of the resistor R6, the other end of the resistor R6 is connected with the other end of the resistor R6 and the inverting input terminal of the operational amplifier AR6, the non-inverting input terminal of the operational amplifier AR6 is connected with the cathode of the diode D6, one end of a capacitor C6 and the collector of the transistor Q6, the other end of the capacitor C6 is grounded, the base of the transistor Q6 is connected with the resistor R6, one end of the resistor R6 and the inverting input terminal of the operational amplifier AR6, the other end of the resistor R6 is connected with the inverting input terminal of the operational amplifier AR6, the emitter of the transistor R6 and one end of the transistor R6 are connected with the transistor R6, and the collector of the transistor R6, and the emitter of the transistor R6, the base of the transistor Q5 is connected with the other end of the resistor R8 and one end of the capacitor C4, the other ends of the resistor R9 and the capacitor C4 are grounded, the output end of the operational amplifier AR3 is connected with the cathode of the diode D8 and the anode of the diode D8, the cathode of the diode D8 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with one end of the capacitor C8 and the non-inverting input end of the operational amplifier AR 8, the other end of the capacitor C8 is grounded, the output end of the operational amplifier AR 8 is connected with the other end of the resistor R8 and one end of the resistor R8, the other end of the resistor R8 is connected with one end of the resistor R8 and the inverting input end of the operational amplifier AR 8, the other end of the resistor R8 is connected with the base of the non-inverting input end of the transistor R8 and the non-inverting input end of the operational amplifier AR 8, the output end of the transistor R8 is connected with the non-inverting input end, the inverting input terminal of the operational amplifier AR6 is connected to one end of the resistor R17, and the other end of the resistor R17 is connected to the emitter of the transistor Q6.
2. The power distribution network data safety early warning system of claim 1, wherein the filtering and transmitting circuit comprises an inductor L1, one end of the inductor L1 is connected with one end of a resistor R18 and one end of a capacitor C6, the other end of the resistor R18 is connected with the output end of the amplifier AR6, the other end of the inductor L1 is connected with one end of a capacitor C7, one end of a resistor R19 and the negative electrode of a voltage regulator tube D10, the other ends of the capacitor C6 and the capacitor C7 are connected with ground, the positive electrode of the voltage regulator tube D10 is connected with ground, and the other end of the resistor R19 is connected with a signal transmitter E1.
3. The power distribution network data safety early warning system as claimed in claim 1 or 2, wherein the first voltage acquisition circuit comprises a voltage collector J1 with the model of PIM600MC, a power supply end of the voltage collector J1 is connected with +5V, a ground end of the voltage collector J1 is connected with ground, an output end of the voltage collector J1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R2 and a negative electrode of a regulator D1, an anode of the regulator D1 is connected with ground, the other end of the resistor R2 is connected with a base of a triode Q1, a collector of a triode Q1 is connected with a base of a triode Q2 and an anode of a diode D2, an emitter of a triode Q2 is connected with an emitter of a triode Q1, a negative electrode of a diode D2 is connected with one end of a capacitor C1, and the other end of the capacitor C1 is connected with a collector of a non-inverting input end of a triode Q2 and a non-inverting input end of an operational amplifier 1.
4. The power distribution network data safety early warning system as claimed in claim 2, wherein the second voltage acquisition circuit comprises a voltage collector J2 with the model number PIM600MC, a power supply end of the voltage collector J2 is connected with +5V, a ground end of the voltage collector J2 is connected with ground, an output end of the voltage collector J2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with one end of a resistor R4 and a cathode of a regulator D3, an anode of the regulator D3 is connected with ground, the other end of the resistor R4 is connected with a base of a transistor Q3, a collector of the transistor Q3 is connected with a base of a transistor Q4 and an anode of a diode D4, an emitter of the transistor Q3 is connected with an emitter of a transistor Q4, a cathode of the diode D4 is connected with one end of a capacitor C2, and the other end of the capacitor C2 is connected with a collector of a transistor Q4 and a collector of a transistor Q5.
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| CN109861383A (en) * | 2018-11-30 | 2019-06-07 | 国网江苏省电力有限公司南京供电分公司 | A kind of event preprocess method merging electric network information physical abnormalities |
| CN109921415A (en) * | 2019-03-13 | 2019-06-21 | 东北大学 | A kind of pernicious online defence method of Data Injection Attacks of power grid towards hybrid measurement |
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