CN111711266A - Network communication system, method and device based on power line - Google Patents
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Abstract
The invention belongs to the technical field of computer interaction, and particularly relates to a network communication system, a method and a device based on a power line, wherein the system comprises: power stations, power networks, transmission networks, transformers, servers, gateways, calculators, modems, user terminals and filters; characterized in that the method performs the following steps: a first filter is arranged between the power network and the transmission network and in front of the gateway and close to the power network; a second filter is arranged between the transmission network and the user terminal and is close to the transmission network before the modem; the method has the advantages of strong anti-interference capability and high transmission efficiency.
Description
Technical Field
The invention belongs to the technical field of power communication, and particularly relates to a network communication system, method and device based on a power line.
Background
The power communication network is developed to ensure safe and stable operation of the power system. The system is combined with a relay protection and safety and stability control system and a dispatching automation system of a power system to be called as three major pillars for safe and stable operation of the power system. At present, the method is the basis of power grid dispatching automation, network operation marketization and management modernization; is an important means for ensuring the safe, stable and economic operation of the power grid; is an important infrastructure of power systems. Because the power communication network has strict requirements on the reliability of communication, the rapidness and the accuracy of protection control information transmission, and the power department has special resource advantages for developing communication, the power companies of most countries in the world establish the power system special communication network mainly by self-construction.
Electric power communication has created magnificence in the early 80 s, but the technical level of electric power communication has lagged behind by the end of 90 s. Therefore, technical innovation is listed as a serious part of the development of power communication, and the technical development direction of power communication is determined: in the aspect of transmission, power communication is mainly developed into optical fiber communication, so that abundant communication resources stored in a power grid can be effectively utilized, and wdm and dwdm technologies are adopted timely. Meanwhile, the existing microwave communication infrastructure is fully utilized, necessary technical transformation is carried out, and the power communication transmission network frame is more perfect. In the aspect of a service network, an electric power data network integrated service platform is built by adopting atm and ip technologies, and service support and service are provided for electric power markets, production scheduling and electric power industry informatization. Meanwhile, the power communication will also track the development of ip technology in transmitting power critical operation services, focusing on the related technology of transmitting data by using a power distribution line. The national electric power company system establishes opgw optical cable with 1 ten thousand kilometers, including the lines of Beijing, Shenyang, Harbin, Longquan, Wuhan, Shanghai, Longquan, Zhengzhou, Shijiazhuang, Beijing, and the like. It is expected that a three-vertical four-horizontal optical fiber trunk communication network frame will be built by 2005 or so.
There are potential and resource advantages to the development of telecommunications for power systems. The potential is that power communication has a private communication network covering national power systems, and has abundant communication network infrastructure. The resource advantage is firstly reflected in the aspect of long-distance transmission, and the long-distance communication capability can be quickly formed by using special power cables such as a ground wire winding optical cable (gwop), a self-supporting optical cable (adss), a ground wire composite optical cable (opgw) and the like laid by a power transmission line. The electric special optical cable is low in possibility of being damaged by external force, high in reliability and mature in technology, and particularly the opgw technology is widely applied in China. And secondly, in the aspect of local transmission, poles and channels of an electric power system in a city can be used for communication service, and play an important role in the aspect of broadband access networks.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a network communication system, method and device based on power line, which have the advantages of strong interference resistance and high transmission efficiency.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a power line based network communication system, the system comprising: power stations, power networks, transmission networks, transformers, servers, gateways, calculators, modems, user terminals and filters; the transformer is arranged between the power station and the power network and is connected with the power station and the power network; a gateway is arranged between the power network and the transmission network; the calculator is arranged on the power network and used for measuring power consumption; the server is arranged on the transmission network and provides network service; the modems are respectively arranged between the server and the transmission network and between the transmission network and the user terminal to modulate and demodulate signals; a first filter is arranged between the power network and the transmission network and in front of the gateway and close to the power network; a second filter is arranged between the transmission network and the user terminal and is close to the transmission network before the modem; the first filter generates an anti-interference device by establishing a feedback filtering model, and further generates a feedback controller for performing feedback control filtering; the second filter carries out filtering through circularly calculating network deviation compensation; the harmonic waves in the system are reduced after being filtered by the first filter; the filtering by the second filter reduces noise in the system.
Further, when the first filter performs filtering, a feedback filtering model is established by the following formula:
wherein v isnAnd inN is 1,2,3 is the voltage and current values of the power network for each phase; the R iscAnd LcThe self-inductance and self-capacitance of the first filter; v. of1M、v2MAnd v3MA voltage value of the first filter for each phase; v. ofMNFor the purpose of the voltage correction value,
further, the interference suppressor is generated by the following formula:
Further, the method for filtering by circularly calculating the network deviation compensation performs the following steps:
step S1: the output noise estimation is performed using the following equation:
wherein, the
Estimating for the output noise; the kappa is an input signal-to-noise ratio; the above-mentioned
Estimating for the input noise; the above-mentioned
Estimating for analog noise; and M is an adjustment coefficient, and the value range is as follows: 1.2 to 2.5; the above-mentioned
The step length parameter is a value range of 4-8; the T is a step order and takes the value of 6;
step S2: calculating a network bias compensation from the calculated output noise estimate, comprising the steps of: respectively updating the weight vector of the small-step self-adaptive filter and the weight vector of the large-step self-adaptive filter by adopting a normalized minimum mean square error criterion of deviation compensation; wherein, the updating of the weight vector of the small-step adaptive filter adopts the following formula:
wherein,
is an input signal;
the forward adjustment parameter is a value of 0.02;
is a small step size systematic error; w is a1(n) is a small compensation input; wherein, the updating of the weight vector of the large-step-length adaptive filter adopts the following formula:
large step size systematic errors; w is a2(n) is large step input.
Step S3: and step S2 is executed in a loop, an average value is obtained, the final result is the deviation compensation result, and the deviation compensation result is used for filtering.
Further, the modem is arranged between the server and the transmission network, and the signal modulation method comprises the following steps: using the following formula for the input signal
And (3) modulation:
wherein t is modulation time; f. of0Is the modulation frequency.
Further, the modem is disposed between the transmission network and the user terminal, and the method for demodulating the signal includes the following steps: the inverse process of modulating the signal is performed, and the signal is demodulated.
A power line based network communication method, the system comprising: power stations, power networks, transmission networks, transformers, servers, gateways, calculators, modems, user terminals and filters; the method performs the following steps: a first filter is arranged between the power network and the transmission network and in front of the gateway and close to the power network; a second filter is arranged between the transmission network and the user terminal and is close to the transmission network before the modem; the first filter generates an anti-interference device by establishing a feedback filtering model, and further generates a feedback controller for performing feedback control filtering; the second filter carries out filtering by circularly calculating network deviation compensation; the harmonic waves in the system are reduced after being filtered by the first filter; the filtering by the second filter reduces noise in the system.
Further, when the first filter performs filtering, a feedback filtering model is established by the following formula:
wherein v isnAnd inN is 1,2,3 is the voltage and current values of the power network for each phase; the R iscAnd LcThe self-inductance and self-capacitance of the first filter; v. of1M、v2MAnd v3MA voltage value of the first filter for each phase; v. ofMNFor the purpose of the voltage correction value,
further, the interference suppressor is generated by the following formula:
wherein, KρIs an anti-interference device, lambda is an integral order, the value range is 1-3, and KiThe value range is 2-5 for integral coefficient; omega is real number frequency, the value range is 2-6 times/s, and TeIs the filter coefficient, value range5 to 10.
A power line based network communication device, the device comprising: power stations, power networks, transmission networks, transformers, servers, gateways, calculators, modems, user terminals and filters; the transformer is arranged between the power station and the power network and is connected with the power station and the power network; a gateway is arranged between the power network and the transmission network; the calculator is arranged on the power network and used for measuring power consumption; the server is arranged on the transmission network and provides network service; the modems are respectively arranged between the server and the transmission network and between the transmission network and the user terminal to modulate and demodulate signals; the system is characterized in that a first filter is arranged between the power network and the transmission network and in front of the gateway and close to the power network; a second filter is arranged between the transmission network and the user terminal and is close to the transmission network before the modem; the first filter generates an anti-interference device by establishing a feedback filtering model, and further generates a feedback controller for performing feedback control filtering; the second filter carries out filtering through circularly calculating network deviation compensation; the harmonic waves in the system are reduced after being filtered by the first filter; the filtering by the second filter reduces noise in the system.
The network communication system, the method and the device based on the power line have the following beneficial effects: the invention reduces the harmonic wave of the input signal through the first filtering, reduces the noise of the output signal through the second filtering, effectively reduces the error rate of the signal and improves the accuracy of the signal transmission of the power system. Meanwhile, the input signal and the output signal are modulated and transmitted, and the effectiveness of system signal transmission is effectively improved.
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Fig. 1 is a schematic diagram of a system structure of a power line-based network communication system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method of a power line based network communication method according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a comparison test effect between a signal error rate of a system of a network communication system based on a power line according to an embodiment of the present invention and a signal error rate of a communication system in the prior art.
Wherein, 1-the signal error rate experimental curve of the invention, 2-the signal error rate experimental curve of the prior art.
Detailed Description
The method of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments of the invention.
Example 1
A power line based network communication system, the system comprising: power stations, power networks, transmission networks, transformers, servers, gateways, calculators, modems, user terminals and filters; the transformer is arranged between the power station and the power network and is connected with the power station and the power network; a gateway is arranged between the power network and the transmission network; the calculator is arranged on the power network and used for measuring power consumption; the server is arranged on the transmission network and provides network service; the modems are respectively arranged between the server and the transmission network and between the transmission network and the user terminal to modulate and demodulate signals; a first filter is arranged between the power network and the transmission network and in front of the gateway and close to the power network; a second filter is arranged between the transmission network and the user terminal and is close to the transmission network before the modem; the first filter generates an anti-interference device by establishing a feedback filtering model, and further generates a feedback controller for performing feedback control filtering; the second filter carries out filtering through circularly calculating network deviation compensation; the harmonic waves in the system are reduced after being filtered by the first filter; the filtering by the second filter reduces noise in the system.
In particular, the calculator may further be provided with a communication interface towards the end-user appliance such as, for example, a local area network interface, a wireless interface (e.g. bluetooth), a home power line communication interface, or others. In this way, for example, electrical power distributors can be controlled via electrical appliances such as, for example, electric boilers, heating devices, washing machines, dryers, etc. or other appliances, and switch them on/off according to a given timing scheme. This can result in a more modest power consumption overall, which is beneficial from the standpoint of power production, transmission and distribution. The interface can also be used to connect other consumption calculators such as, for example, water and gas consumption calculators, thus also enabling these devices to be read out remotely.
On the basis of the above embodiment, when the first filter performs filtering, a feedback filtering model is established by the following formula:
wherein v isnAnd inN is 1,2,3 is the voltage and current values of the power network for each phase; the R iscAnd LcThe self inductance and the self capacitance of the first filter; v. of1M、v2MAnd v3MA voltage value of the first filter for each phase; v. ofMNFor the purpose of the voltage correction value,
specifically, the filtering is a circuit which allows only a signal component in a certain frequency range to normally pass through, and prevents another part of the frequency component from passing through, and is called a classical filter or a filtering circuit. In fact, any electronic system has its own frequency bandwidth (a limit to the highest frequency of the signal), and the frequency characteristics reflect this fundamental characteristic of the electronic system. The filter is an engineering application circuit designed according to the influence of circuit parameters on the circuit frequency bandwidth.
On the basis of the above embodiment, the interference suppressor is generated by the following formula:
wherein, KρIs an anti-interference device, lambda is an integral order, the value range is 1-3, and KiThe value range is 2-5 for integral coefficient; omega is real number frequency, the value range is 2-6 times/s, and TeThe filter coefficient is in a value range of 5-10.
Specifically, when the current flowing through the inductor changes during filtering, the induced electromotive force generated in the inductor coil will prevent the current from changing. When the current passing through the inductance coil is increased, the self-inductance electromotive force generated by the inductance coil is opposite to the current direction, so that the current is prevented from being increased, and meanwhile, a part of electric energy is converted into magnetic field energy to be stored in the inductor; when the current through the inductor coil is reduced, the self-induced electromotive force is in the same direction as the current, preventing the reduction of the current, and releasing the stored energy to compensate the reduction of the current. Therefore, after the filtering by the inductor, not only the pulsation of the load current and the voltage is reduced and the waveform is smoothed, but also the conduction angle of the rectifier diode is increased. Under the condition that the inductance coil is not changed, the smaller the load resistance is, the smaller the alternating current component of the output voltage is. Better filtering effect can be obtained only when RL > > ω L. The larger L, the better the filtering effect. In addition, due to the action of the filter inductance electromotive force, the conduction angle of the diode is close to pi, the impact current of the diode is reduced, the current flowing through the diode is smoothed, and the service life of the rectifier diode is prolonged.
On the basis of the above embodiment, the method for filtering by circularly calculating the network deviation compensation performs the following steps:
step S1: the output noise estimation is performed using the following equation:
wherein, the
Estimating for the output noise; k is an input signal-to-noise ratio; the above-mentioned
Estimating for the input noise; the above-mentioned
Estimating for analog noise; and M is an adjustment coefficient, and the value range is as follows: 1.2 to 2.5; the above-mentioned
The step length parameter is a value range of 4-8; the T is a step order and takes the value of 6;
step S2: calculating a network bias compensation from the calculated output noise estimate, comprising the steps of: respectively updating the weight vector of the small-step self-adaptive filter and the weight vector of the large-step self-adaptive filter by adopting a normalized minimum mean square error criterion of deviation compensation; wherein, the updating of the weight vector of the small-step adaptive filter adopts the following formula:
wherein,
is an input signal;
the forward adjustment parameter is a value of 0.02;
is a small step size systematic error; w is a1(n) is a small compensation input; wherein, the updating of the weight vector of the large-step-length adaptive filter adopts the following formula:
large step size systematic errors; w is a2(n) is large step input.
Step S3: and step S2 is executed in a loop, an average value is obtained, the final result is the deviation compensation result, and the deviation compensation result is used for filtering.
Specifically, the SIGNAL-to-NOISE RATIO, known by the english name SNR or S/N (SIGNAL-to-NOISE RATIO), is also referred to as SIGNAL-to-NOISE RATIO. Refers to the ratio of signal to noise in an electronic device or system. The signal refers to an electronic signal from outside the device to be processed by the device, the noise refers to an irregular extra signal (or information) which does not exist in the original signal generated after passing through the device, and the signal does not change along with the change of the original signal. Similarly, "original signal does not exist" or "distortion" is a thing, distortion and noise actually have a certain relationship, and the difference between the distortion and the noise is that the distortion is regular, and the noise is irregular.
The unit of measurement of the signal-to-noise ratio is dB, and the calculation method is 10lg (Ps/Pn), wherein Ps and Pn respectively represent the effective power of the signal and the noise, and can also be converted into the ratio relation of the voltage amplitude: 20Lg (Vs/Vn), Vs and Vn represent "effective values" of the signal and noise voltages, respectively. In an audio amplifier, it is desirable that the amplifier should not add anything more than amplify the signal. Therefore, the higher the signal-to-noise ratio, the better.
In a narrow sense, the ratio of the power of the output signal of the amplifier to the power of the noise output at the same time, often expressed in decibels, a higher signal-to-noise ratio of the device indicates that it generates less noise. Generally, the larger the signal-to-noise ratio, the smaller the noise mixed in the signal, the higher the quality of sound playback, and vice versa. The signal-to-noise ratio should not be lower than 70dB generally, and the signal-to-noise ratio of the hi-fi loudspeaker box should reach more than 110 dB.
On the basis of the above embodiment, the modem is disposed between the server and the transmission network, and the method for modulating the signal includes the following steps: using the following formula for the input signal
And (3) modulation:
wherein t is modulation time; f. of0To modulateFrequency.
In particular, the purpose of modulation is to convert an analog or digital signal to be transmitted into a signal suitable for transmission over a channel, which means that the baseband signal (source) is converted into a band-pass signal of very high frequency relative to the baseband frequency. The signal is referred to as a modulated signal and the baseband signal is referred to as a modulated signal. Modulation may be achieved by varying the amplitude, phase or frequency of the high frequency carrier as the signal amplitude varies. The modulation process is used at the originating end of the communication system. At the receiving end, the modulated signal is restored to the original signal to be transmitted, i.e., the baseband signal is extracted from the carrier wave for processing and understanding by the intended recipient (sink). This process is called demodulation.
Specifically, the modulation types are very many, and the classification methods are not consistent. The modulation signal can be divided into analog modulation and digital modulation. Modulation with an analog signal is referred to as analog modulation; modulation with data or digital signals is referred to as digital modulation. The modulation method can be divided into pulse modulation, sine wave modulation, intensity modulation (such as incoherent light modulation) and the like according to the type of the modulated signal. The modulated carriers are pulses, sine waves, light waves, etc. The sine wave modulation has three basic modes of amplitude modulation, frequency modulation and phase modulation, and the two modes are called angle modulation together. In addition, there are some kinds of modulation, such as single sideband amplitude modulation, vestigial sideband amplitude modulation, etc. Pulse modulation may also be classified in a similar way. Further, complex modulation, multiplex modulation, and the like are available. Different modulation schemes have different characteristics and properties.
On the basis of the above embodiment, the modem is disposed between the transmission network and the user terminal, and the method for demodulating the signal includes the following steps: the inverse process of modulating the signal is performed, and the signal is demodulated.
A power line based network communication method, the system comprising: power stations, power networks, transmission networks, transformers, servers, gateways, calculators, modems, user terminals and filters; the method performs the following steps: a first filter is arranged between the power network and the transmission network and in front of the gateway and close to the power network; a second filter is arranged between the transmission network and the user terminal and is close to the transmission network before the modem; the first filter generates an anti-interference device by establishing a feedback filtering model, and further generates a feedback controller for performing feedback control filtering; the second filter carries out filtering by circularly calculating network deviation compensation; the harmonic waves in the system are reduced after being filtered by the first filter; the filtering by the second filter reduces noise in the system.
On the basis of the above embodiment, when the first filter performs filtering, a feedback filtering model is established by the following formula:
wherein v isnAnd inN is 1,2,3 is the voltage and current values of the power network for each phase; the R iscAnd LcThe self inductance and the self capacitance of the first filter; v. of1M、v2MAnd v3MA voltage value of the first filter for each phase; v. ofMNFor the purpose of the voltage correction value,
on the basis of the above embodiment, the interference suppressor is generated by the following formula:
wherein, KρIs an anti-interference device, lambda is an integral order, the value range is 1-3, and KiThe value range is 2-5 for integral coefficient; omega is real number frequency, the value range is 2-6 times/s, and TeThe filter coefficient is in a value range of 5-10.
Specifically, with the progress and development of society, the living standard of people is increasingly improved, a large amount of electric equipment is put into daily production and life, and consequently, a large amount of harmonic waves and pollution of dead power appear in the power grid, which seriously affects the quality of electric energy. Harmonic voltage or harmonic current in a power grid can increase additional loss of power system equipment, so that the problems of measurement and automatic control instrument failure and the like are caused, the use efficiency of the equipment is influenced, and a fire disaster can be caused by overheating of a line in serious cases.
At present, an external harmonic compensation device is mainly adopted to compensate harmonic waves, and filters are divided into a passive filter and an active filter. The control effect of the passive filter on the harmonic waves is greatly influenced by the impedance characteristic of a system, the passive filter is extremely susceptible to the influence of temperature, harmonic waves and nonlinear load changes, and the filtering performance of the passive filter is unstable. In addition, the passive filter can only filter out specific order harmonics, and is not suitable for places with complex harmonic conditions. The defects that only specific harmonic waves can be compensated and the like exist, so that the treatment on the electric energy problem is mainly concentrated on an active filter at present. Compared with a passive filter, the active filter realizes dynamic compensation and has high response speed; the capacity of the required energy storage element is not large; the influence of the power grid impedance is not large, and the resonance with the power grid impedance can not occur.
A power line based network communication device, the device comprising: power stations, power networks, transmission networks, transformers, servers, gateways, calculators, modems, user terminals and filters; the transformer is arranged between the power station and the power network and is connected with the power station and the power network; a gateway is arranged between the power network and the transmission network; the calculator is arranged on the power network and used for measuring power consumption; the server is arranged on the transmission network and provides network service; the modems are respectively arranged between the server and the transmission network and between the transmission network and the user terminal to modulate and demodulate signals; the system is characterized in that a first filter is arranged between the power network and the transmission network and in front of the gateway and close to the power network; a second filter is arranged between the transmission network and the user terminal and is close to the transmission network before the modem; the first filter generates an anti-interference device by establishing a feedback filtering model, and further generates a feedback controller for performing feedback control filtering; the second filter carries out filtering through circularly calculating network deviation compensation; the harmonic waves in the system are reduced after being filtered by the first filter; the filtering by the second filter reduces noise in the system.
The above description is only an embodiment of the present invention, but not intended to limit the scope of the present invention, and any structural changes made according to the present invention should be considered as being limited within the scope of the present invention without departing from the spirit of the present invention.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process and related description of the system described above may refer to the corresponding process in the foregoing method embodiments, and will not be described herein again.
It should be noted that, the system provided in the foregoing embodiment is only illustrated by dividing the functional modules, and in practical applications, the functions may be distributed by different functional modules according to needs, that is, the modules or steps in the embodiment of the present invention are further decomposed or combined, for example, the modules in the foregoing embodiment may be combined into one module, or may be further decomposed into multiple sub-modules, so as to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the modules or steps, and are not to be construed as unduly limiting the present invention.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes and related descriptions of the storage device and the processing device described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Those of skill in the art would appreciate that the various illustrative modules, method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that programs corresponding to the software modules, method steps may be located in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable magnetic disk, CD-ROM, or any other form of storage medium known in the art. To clearly illustrate this interchangeability of electronic hardware and software, various illustrative components and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as electronic hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing or implying a particular order or sequence.
The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A power line based network communication system, the system comprising: power stations, power networks, transmission networks, transformers, servers, gateways, calculators, modems, user terminals and filters; the transformer is arranged between the power station and the power network and is connected with the power station and the power network; a gateway is arranged between the power network and the transmission network; the calculator is arranged on the power network and used for measuring power consumption; the server is arranged on the transmission network and provides network service; the modems are respectively arranged between the server and the transmission network and between the transmission network and the user terminal to modulate and demodulate signals; the system is characterized in that a first filter is arranged between the power network and the transmission network and in front of the gateway and close to the power network; a second filter is arranged between the transmission network and the user terminal and is close to the transmission network before the modem; the first filter generates an anti-interference device by establishing a feedback filtering model, and further generates a feedback controller for performing feedback control filtering; the second filter carries out filtering through circularly calculating network deviation compensation; the harmonic waves in the system are reduced after being filtered by the first filter; the filtering by the second filter reduces noise in the system.
2. The system of claim 1, wherein the first filter, when filtering, builds a feedback filtering model by:
wherein v isnAnd inN is 1,2,3 is the voltage and current values of the power network for each phase; the R iscAnd LcThe self-inductance and self-capacitance of the first filter; v. of1M、v2MAnd v3MA voltage value of the first filter for each phase; v. ofMNFor the purpose of the voltage correction value,
3. the system of claim 2, wherein the interference rejector is generated by the formula:
wherein, KρIs an anti-interference device, lambda is an integral order, the value range is 1-3, and KiThe value range is 2-5 for integral coefficient; omega is real number frequency, the value range is 2-6 times/s, and TeThe filter coefficient is in a value range of 5-10.
4. The system of claim 3, wherein the method of filtering by circularly computing network bias compensation performs the steps of:
step S1: the output noise estimation is performed using the following equation:
wherein, the
Estimating for the output noise; the kappa is an input signal-to-noise ratio; the above-mentioned
Estimating for the input noise; the above-mentioned
Estimating for analog noise; and M is an adjustment coefficient, and the value range is as follows: 1.2 to 2.5; the above-mentioned
The step length parameter is a value range of 4-8; the T is a step order and takes the value of 6;
step S2: calculating a network bias compensation from the calculated output noise estimate, comprising the steps of: respectively updating the weight vector of the small-step self-adaptive filter and the weight vector of the large-step self-adaptive filter by adopting a normalized minimum mean square error criterion of deviation compensation; wherein, the updating of the weight vector of the small-step adaptive filter adopts the following formula:
wherein,
is an input signal;
the forward adjustment parameter is a value of 0.02;
is a small step size systematic error; w is a1(n) is a small compensation input; wherein, the updating of the weight vector of the large-step-length adaptive filter adopts the following formula:
large step size systematic errors; w is a2(n) is large step input.
Step S3: and step S2 is executed in a loop, an average value is obtained, the final result is the deviation compensation result, and the deviation compensation result is used for filtering.
5. The system of claim 4, wherein the modem is disposed between the server and the transmission network, and the modulation method of the signal performs the following steps: using the following formula for the input signal
And (3) modulation:
where t is in modulationA (c) is added; f. of0Is the modulation frequency.
6. The system of claim 5, wherein the modem is disposed between the transmission network and the user terminal, and the method for demodulating the signal comprises the steps of: the inverse process of modulating the signal is performed, and the signal is demodulated.
7. A power line based network communication method based on the system of one of claims 1 to 6, the system comprising: power stations, power networks, transmission networks, transformers, servers, gateways, calculators, modems, user terminals and filters; characterized in that the method performs the following steps: a first filter is arranged between the power network and the transmission network and in front of the gateway and close to the power network; a second filter is arranged between the transmission network and the user terminal and is close to the transmission network before the modem; the first filter generates an anti-interference device by establishing a feedback filtering model, and further generates a feedback controller for performing feedback control filtering; the second filter carries out filtering through circularly calculating network deviation compensation; the harmonic waves in the system are reduced after being filtered by the first filter; the filtering by the second filter reduces noise in the system.
8. The method of claim 7, wherein the first filter, when filtering, builds a feedback filtering model by:
wherein v isnAnd inN is 1,2,3 is the voltage and current values of the power network for each phase; the R iscAnd LcThe self-inductance and self-capacitance of the first filter; v. of1M、v2MAnd v3MA voltage value of the first filter for each phase; v. ofMNFor the purpose of the voltage correction value,
9. the method of claim 8, wherein the interference rejector is generated by the formula:
wherein, KρIs an anti-interference device, lambda is an integral order, the value range is 1-3, and KiThe value range is 2-5 for integral coefficient; omega is real number frequency, the value range is 2-6 times/s, and TeThe filter coefficient is in a value range of 5-10.
10. A power line based network communication apparatus based on the system of one of claims 1 to 6, characterized in that the apparatus comprises: power stations, power networks, transmission networks, transformers, servers, gateways, calculators, modems, user terminals and filters; the transformer is arranged between the power station and the power network and is connected with the power station and the power network; a gateway is arranged between the power network and the transmission network; the calculator is arranged on the power network and used for measuring power consumption; the server is arranged on the transmission network and provides network service; the modems are respectively arranged between the server and the transmission network and between the transmission network and the user terminal to modulate and demodulate signals; the system is characterized in that a first filter is arranged between the power network and the transmission network and in front of the gateway and close to the power network; a second filter is arranged between the transmission network and the user terminal and is close to the transmission network before the modem; the first filter generates an anti-interference device by establishing a feedback filtering model, and further generates a feedback controller for performing feedback control filtering; the second filter carries out filtering through circularly calculating network deviation compensation; the harmonic waves in the system are reduced after being filtered by the first filter; the filtering by the second filter reduces noise in the system.
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