CN112014680A - Harmonic source positioning method and system for electric power system - Google Patents
Harmonic source positioning method and system for electric power system Download PDFInfo
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Abstract
The invention discloses a harmonic source positioning method of a power system, which comprises the following steps: acquiring voltage signals of a load side and a system side of the power system in real time; when a harmonic source positioning instruction is received, acquiring voltage signals of the load side and the system side at a specified time, and calculating to obtain a harmonic voltage amplitude of the load side, a harmonic voltage amplitude of the system side and a harmonic voltage phase angle difference between the system side and the load side at the specified time, so as to calculate a harmonic source judgment index of the power system and determine a main harmonic source of the power system. The invention also discloses a corresponding positioning system, and by implementing the method, the harmonic source positioning of the power system can be realized under the condition of not acquiring the harmonic impedance of the system, and the positioning precision is higher and the operation is simple and convenient.
Description
Technical Field
The invention relates to the field of intelligent power grid equipment, in particular to a harmonic source positioning method and system for a power system.
Background
Due to the fact that the nonlinear load is connected into a power grid in a large scale, a large amount of harmonic waves are injected into a public power grid, the power utilization quality of a user is reduced, electric equipment of the user is damaged, and great influences are caused to the power grid and the user. In order to realize accurate division of harmonic responsibility and further effectively treat harmonic pollution, a harmonic source needs to be accurately positioned. When a harmonic problem occurs at a point of common connection (PCC point) of the system side and the load side, it is necessary to define whether the harmonic problem originates from the system side or the load side.
At present, the method for positioning the harmonic wave is single, and mainly depends on the harmonic wave power or the harmonic wave impedance method. However, in the process of implementing the invention, the inventor finds that the prior art has at least the following problems: the common harmonic source positioning methods all need to know the system harmonic impedance, however, the value is often difficult to obtain accurately, so that the conventional harmonic source positioning methods all have a certain application range and are difficult to meet the actual application requirements.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a system for positioning a harmonic source of an electric power system, which can realize the positioning of the harmonic source of the electric power system under the condition of not acquiring the harmonic impedance of the system, and have the advantages of higher positioning precision and simple and convenient operation.
In order to achieve the above object, an embodiment of the present invention provides a method for locating a harmonic source of an electric power system, including:
acquiring voltage signals of a load side and a system side of the power system in real time;
when a harmonic source positioning instruction is received, acquiring voltage signals of the load side and the system side at a specified time, and calculating to obtain the harmonic voltage amplitude of the load side, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side at the specified time;
calculating a harmonic source judgment index of the power system according to the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side;
and determining a main harmonic source of the power system according to the harmonic source determination index of the power system.
As an improvement of the above solution, the calculating a harmonic source determination index of the power system according to the magnitude of the harmonic voltage amplitude of the load side, the magnitude of the harmonic voltage amplitude of the system side, and the harmonic voltage phase angle difference between the system side and the load side at the specified time may specifically be:
calculating a harmonic source determination index of the power system according to the harmonic voltage amplitude of the load side, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side at the specified time by the following calculation formula:
ΔE＝(1+b2)Ecsin2-2Esbsin；
wherein E iscThe amplitude of the harmonic voltage at the load side is obtained; esThe amplitude of the harmonic voltage at the system side is obtained; the harmonic voltage phase angle difference between the system side and the load side; phIs the active amount of harmonic power; qhIs the reactive amount of harmonic power.
As an improvement of the above solution, the determining a main harmonic source of the power system according to the harmonic source determination index of the power system specifically includes:
judging whether the harmonic source judgment index is larger than zero;
when the harmonic source determination index is larger than zero, determining that a main harmonic source of the power system is a load side;
and when the harmonic source determination index is less than or equal to zero, determining that a main harmonic source of the power system is a system side.
The embodiment of the invention also provides a harmonic source positioning system of the power system, which comprises the following components: a voltage signal acquisition module, an instruction receiving module and a central control module, wherein,
the voltage signal acquisition module is used for acquiring voltage signals of a load side and a system side of the power system in real time;
the instruction receiving module is used for receiving a harmonic source positioning instruction;
the central control module is used for acquiring voltage signals of the load side and the system side at a specified time when a harmonic source positioning instruction is received, so as to calculate and obtain the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side;
calculating a harmonic source judgment index of the power system according to the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side;
and determining a main harmonic source of the power system according to the harmonic source determination index of the power system.
As an improvement of the above scheme, the harmonic source positioning system comprises a system side positioning device and a load side monitoring device; the system side positioning device is installed in a transformer substation of the power system, and the load side monitoring device is installed on a load side;
the voltage signal acquisition module comprises a first voltage signal acquisition unit and is used for acquiring voltage signals of a system side of the power system in real time;
the instruction receiving module comprises a first instruction receiving unit used for receiving a harmonic source positioning instruction;
the central control module comprises a first central control unit, and is used for acquiring a voltage signal of the system side at a specified moment according to the harmonic source positioning instruction received by the first instruction receiving unit; the harmonic source positioning instruction received by the first instruction receiving unit is sent to the load side monitoring device, so that the load side monitoring device returns a voltage signal of the load side at a specified time;
the first central control unit is further configured to:
calculating the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side according to the voltage signal of the system side and the voltage signal of the load side returned by the load side monitoring device;
calculating a harmonic source judgment index of the power system according to the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side;
determining a main harmonic source of the power system according to the harmonic source judgment index of the power system;
the first voltage signal acquisition unit, the first instruction receiving unit and the first central control unit are all arranged in the system side positioning device, and the first voltage signal acquisition unit and the first instruction receiving unit are respectively connected with the first central control unit.
As an improvement of the above scheme, the voltage signal acquisition module further includes a second voltage signal acquisition unit, configured to acquire a voltage signal on a load side of the power system in real time;
the instruction receiving module further comprises a second instruction receiving unit, which is used for receiving the harmonic source positioning instruction transmitted by the first instruction unit;
the central control module further comprises a second central control unit, which is used for acquiring a voltage signal of the load side at a specified moment according to the harmonic source positioning instruction received by the second instruction receiving unit and sending the voltage signal to the first central control unit;
the second voltage signal acquisition unit, the second instruction receiving unit and the second central control unit are arranged in the load side monitoring device; the second voltage signal acquisition unit and the second instruction receiving unit are respectively connected with the second central control unit.
As an improvement of the above scheme, the harmonic source positioning system further comprises a wireless communication module;
the wireless communication module comprises a first wireless communication unit and a second wireless communication unit; the first wireless communication unit is arranged in the system side positioning device and is connected with the first central control unit; the second wireless communication unit is arranged in the load side monitoring device and is connected with the second central control unit;
the second wireless communication unit is used for sending the voltage signal of the load side at the appointed moment to the first wireless communication unit.
As an improvement of the above scheme, the harmonic source positioning system further comprises a GPS time service module;
the GPS time service module comprises a first GPS time service unit; the first GPS time service unit is arranged in the system side positioning device and used for providing a high-precision time stamp for the system side positioning device;
the GPS time service module also comprises a second GPS time service unit; the second GPS time service unit is arranged in the load side monitoring device and used for providing a high-precision time stamp for the load side monitoring device.
As an improvement of the above scheme, the harmonic source positioning system further comprises a data storage module;
the data storage module comprises a first data storage unit, and the first data storage unit is arranged in the system side positioning device and used for storing the system side voltage signal acquired by the system side positioning device;
the data storage module further comprises a second data storage unit, and the second data storage unit is arranged in the load side monitoring device and used for storing the voltage signal of the load side acquired by the load side monitoring device.
As an improvement of the above solution, the harmonic source positioning system further comprises a power supply module;
the power supply module comprises a first power supply unit, and the first power supply unit is arranged in the system side positioning device and used for supplying power to the system side positioning device;
the power module further comprises a second power unit, and the second power unit is arranged in the load side monitoring device and used for supplying power to the load side monitoring device.
Compared with the prior art, the harmonic source positioning method and system of the power system, disclosed by the invention, are used for collecting voltage signals of the load side and the system side of the power system in real time; when a harmonic source positioning instruction is received, acquiring voltage signals of the load side and the system side at a specified time, and calculating to obtain a harmonic voltage amplitude of the load side, a harmonic voltage amplitude of the system side and a harmonic voltage phase angle difference between the system side and the load side at the specified time, so as to calculate a harmonic source judgment index of the power system; and determining a main harmonic source of the power system according to the harmonic source determination index of the power system. And acquiring voltage signals sampled by the system side and the load at the same time according to the specified time contained in the harmonic source positioning instruction so as to calculate a harmonic source judgment index of the power system, thereby realizing the harmonic source positioning of the power system. The harmonic source positioning can be realized without acquiring the system harmonic impedance of the electric power system, the operation process of the harmonic source positioning of the electric power system is greatly simplified, and the accuracy of the harmonic source positioning of the electric power system is improved.
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Fig. 1 is a schematic flowchart illustrating a method for locating a harmonic source in an electrical power system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electrical power system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a local equivalent model of an electric power system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a harmonic source positioning system of an electric power system according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a harmonic source positioning system of an electric power system according to a third embodiment of the present invention;
fig. 6 is a schematic structural diagram of a system-side positioning device in a harmonic source positioning system of an electric power system according to a third embodiment of the present invention;
fig. 7 is a schematic structural diagram of a load-side monitoring device in a harmonic source positioning system of an electric power system according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flowchart illustrating steps of a method for locating a harmonic source of an electric power system according to an embodiment of the present invention. In the first harmonic source locating method of the power system provided by the embodiment of the present invention, the steps S1 to S4 are performed:
and S1, acquiring voltage signals of the load side and the system side of the power system in real time.
And S2, when a harmonic source positioning instruction is received, acquiring voltage signals of the load side and the system side at a specified time, and calculating to obtain the harmonic voltage amplitude of the load side, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side at the specified time.
And S3, calculating a harmonic source judgment index of the power system according to the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side.
And S4, determining a main harmonic source of the power system according to the harmonic source judgment index of the power system.
In the embodiment of the present invention, referring to fig. 2, a schematic structural diagram of an electric power system according to a first embodiment of the present invention is shown. The power system comprises a substation and a load side; the transformer substation represents a system side of the power system, the load side represents a user side or a line side, the number of the load sides is not unique, and each load side is connected with the system side through a bus.
The harmonic source positioning method of the power system is executed by a harmonic source positioning system of the power system. The harmonic source positioning instruction is used for instructing the harmonic source positioning system to perform harmonic source positioning at a specified time so as to judge whether a main harmonic source and a system side or a load side of the power system at the specified time. When the harmonic source positioning system receives the harmonic source positioning instruction, acquiring a voltage signal of a load side and a voltage signal of a system side corresponding to a specified time according to the specified time contained in the harmonic source positioning instruction, and calculating the harmonic voltage amplitude E of the load side according to the voltage signalscThe harmonic voltage amplitude E of the system sidesAnd the harmonic voltage phase angle difference between the system side and the load side, and further calculating a harmonic source judgment index delta E of the power system, wherein the harmonic source judgment index delta E is used for determining a main harmonic source of the power system.
By adopting the technical means of the embodiment of the invention, under the condition that the system harmonic impedance of the electric power system is not required to be obtained, the positioning of the harmonic source of the electric power system can be realized, the operation process of the positioning of the harmonic source of the electric power system is greatly simplified, and the problems that the system harmonic impedance is difficult to obtain and the obtaining precision is low when the method of performing harmonic positioning by adopting the system harmonic impedance of the electric power system in the prior art are solved.
As a preferred embodiment, step S3 of the method for locating a harmonic source in an electric power system specifically includes:
according to the harmonic voltage amplitude E of the load side at the designated momentcThe harmonic voltage amplitude E of the system sidesAnd calculating a harmonic source determination index of the power system by the following calculation formula according to the harmonic voltage phase angle difference between the system side and the load side:
ΔE＝(1+b2)Ecsin2-2Esbsin；
wherein E iscThe amplitude of the harmonic voltage at the load side is obtained; esThe amplitude of the harmonic voltage at the system side is obtained; the harmonic voltage phase angle difference between the system side and the load side; phIs the active amount of harmonic power; qhIs the reactive amount of harmonic power.
Further, step S4 of the method for locating a harmonic source in an electrical power system specifically includes: and judging whether the harmonic source judgment index is larger than zero. When the harmonic source determination index is larger than zero, determining that a main harmonic source of the power system is a load side; and when the harmonic source determination index is less than or equal to zero, determining that a main harmonic source of the power system is a system side.
In the embodiment of the present invention, referring to fig. 3, a schematic diagram of a local equivalent model of an electric power system according to a first embodiment of the present invention is provided. The local equivalent model of the power system comprises a system side equivalent harmonic voltage source, a load side equivalent harmonic voltage source, a system side equivalent harmonic impedance Zs and a user side equivalent harmonic impedance Zc, and the PCC point is a common connection point of the system side and the load side.
Assuming that the harmonic source is transmitted from the power source side to the load side, the active amount of the harmonic power is
The reactive power of the harmonic wave is
Order to
Can be pushed out
The Ec and the Es are harmonic voltage amplitudes of a load side and a system side respectively, are vector values, and are positive values. The harmonic voltage amplitude E of the load sidecAnd the magnitude E of the harmonic voltage on the system sidesAre all scalar quantities.
As can be seen from the above formula, in order to determine the positive or negative of Ec-Es, only (1+ b) needs to be determined2)Ecsin2-2EsPositive and negative of bsin. Will be (1+ b)2)Ecsin2-2Esbsin is set as a harmonic source determination index delta E of the power system, and when the delta E is larger than 0, the load side is determined as a main harmonic source; and otherwise, judging that the system side is a main harmonic source.
When a harmonic source positioning instruction is received, according to the specified time contained in the harmonic source positioning instruction, voltage signals sampled at the same time by a system side and a load are obtained to calculate a harmonic source judgment index of the power system, so that the harmonic source positioning of the power system is realized. The harmonic source positioning can be realized without acquiring the system harmonic impedance of the electric power system, the operation process of the harmonic source positioning of the electric power system is greatly simplified, and the accuracy of the harmonic source positioning of the electric power system is improved.
Referring to fig. 4, a schematic structural diagram of a harmonic source positioning system of an electric power system according to a second embodiment of the present invention is provided. A harmonic source positioning system 20 of an electric power system provided in the second embodiment of the present invention includes: a voltage signal acquisition module 21, an instruction receiving module 22 and a central control module 23, wherein,
the voltage signal acquisition module 21 is configured to acquire voltage signals of a load side and a system side of the power system in real time.
The instruction receiving module 22 is configured to receive a harmonic source positioning instruction.
The central control module 23 is configured to, when a harmonic source positioning instruction is received, obtain voltage signals of the load side and the system side at a specified time, and calculate to obtain a harmonic voltage amplitude of the load side at the specified time, a harmonic voltage amplitude of the system side, and a harmonic voltage phase angle difference between the system side and the load side;
calculating a harmonic source judgment index of the power system according to the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side;
and determining a main harmonic source of the power system according to the harmonic source determination index of the power system.
Specifically, according to the magnitude of the harmonic voltage on the load side, the magnitude of the harmonic voltage on the system side, and the harmonic voltage phase angle difference between the system side and the load side at the specified time, a harmonic source determination index of the power system is calculated by the following calculation formula:
ΔE＝(1+b2)Ecsin2-2Esbsin；
wherein E iscThe amplitude of the harmonic voltage at the load side is obtained; esThe amplitude of the harmonic voltage at the system side is obtained; the harmonic voltage phase angle difference between the system side and the load side; phIs the active amount of harmonic power; qhIs the reactive amount of harmonic power.
Further, after the harmonic source judgment index of the power system is obtained through calculation, whether the harmonic source judgment index is larger than zero is judged; when the harmonic source determination index is larger than zero, determining that a main harmonic source of the power system is a load side; and when the harmonic source determination index is less than or equal to zero, determining that a main harmonic source of the power system is a system side.
The second embodiment of the invention provides a harmonic source positioning system of an electric power system, and when a harmonic source positioning instruction is received, voltage signals sampled at the same time by a system side and a load are obtained according to the specified time contained in the harmonic source positioning instruction, so that a harmonic source judgment index of the electric power system is calculated, and the harmonic source positioning of the electric power system is realized. The harmonic source positioning can be realized without acquiring the system harmonic impedance of the electric power system, the operation process of the harmonic source positioning of the electric power system is greatly simplified, and the accuracy of the harmonic source positioning of the electric power system is improved.
Fig. 5 is a schematic structural diagram of a harmonic source positioning system of an electric power system according to a third embodiment of the present invention. On the basis of the second embodiment, the harmonic source positioning system 30 includes a system side positioning device 31 and a load side monitoring device 32; the system-side positioning device 31 is installed in a substation of the power system, and the load-side monitoring device 32 is installed on the load side.
Specifically, referring to fig. 6-7, fig. 6 is a schematic structural diagram of a system-side positioning device in a harmonic source positioning system of an electric power system according to a third embodiment of the present invention; fig. 7 is a schematic structural diagram of a load-side monitoring device in a harmonic source positioning system of an electric power system according to a third embodiment of the present invention.
The voltage signal acquisition module 21 includes a first voltage signal acquisition unit 311, configured to acquire a voltage signal at a system side of the power system in real time;
the instruction receiving module 22 includes a first instruction receiving unit 312 for receiving a harmonic source positioning instruction;
the central control module 23 includes a first central control unit 313, configured to obtain a voltage signal of the system side at a specified time according to the harmonic source positioning instruction received by the first instruction receiving unit 312; and sending the harmonic source positioning instruction received by the first instruction receiving unit 312 to the load side monitoring device 32 to make the load side monitoring device 32 return to the voltage signal of the load side at a specified time;
the first central control unit 313 is further configured to:
calculating the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side according to the voltage signal of the system side and the voltage signal of the load side returned by the load side monitoring device;
calculating a harmonic source judgment index of the power system according to the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side;
determining a main harmonic source of the power system according to the harmonic source judgment index of the power system;
the first voltage signal acquisition unit 311, the first instruction receiving unit 312 and the first central control unit 313 are all disposed in the system-side positioning device 31, and the first voltage signal acquisition unit 311 and the first instruction receiving unit 312 are respectively connected to the first central control unit 313.
Further, the voltage signal collecting module 21 further includes a second voltage signal collecting unit 321, configured to collect a voltage signal on a load side of the power system in real time;
the instruction receiving module 22 further includes a second instruction receiving unit 322, configured to receive the harmonic source positioning instruction transmitted by the first instruction unit 312;
the central control module 23 further includes a second central control unit 323, configured to obtain a voltage signal of the load side at a specified time according to the harmonic source positioning instruction received by the second instruction receiving unit 322, and send the voltage signal to the first central control unit 313;
the second voltage signal acquisition unit 321, the second instruction receiving unit 322, and the second central control unit 323 are disposed in the load side monitoring device 32; the second voltage signal collecting unit 321 and the second instruction receiving unit 322 are respectively connected to the second central control unit 323.
In the embodiment of the present invention, a system side positioning device 31 is disposed at a substation, that is, a system side, of the power system, and the system side positioning device includes a first central control unit 313, a first voltage signal acquisition module 311, and a first instruction receiving unit 312; meanwhile, a load side monitoring device 32 is provided in each load side, and the load side monitoring device 32 includes a second central control unit 323, a second voltage signal acquisition module 321, and a second instruction receiving module 322. The voltage signal acquisition unit is an AD sampling module and is used for acquiring voltage signals of three-phase voltages of a transformer substation or a load side. The instruction receiving unit may be a human-computer interface disposed on the system-side positioning device or the load-side monitoring device, and a user may input a harmonic source positioning instruction through the instruction receiving unit.
In one embodiment, a user inputs a harmonic source positioning command through first command receiving unit 312 provided in the system-side positioning device, so that first command receiving unit 312 transmits the harmonic source positioning command to first central control unit 313, and instructs first central control unit 313 to start processing an operation for positioning a harmonic source at a specified time. The operation performed by the first central control unit 313 after receiving the instruction specifically includes: according to the harmonic source positioning instruction, acquiring a voltage signal of a system side corresponding to a specified time contained in the instruction; and, the harmonic source positioning instruction is transmitted to the second central control unit 323 in the load side monitoring device 32 of each load side. The second central control unit 323 in each load-side monitoring device acquires a voltage signal on the load side corresponding to the specified time included in the command, and returns the acquired voltage signal on the load side to the first central control unit 313.
Next, taking the load side i as an example, the first central control unit 313 performs FFT conversion on the voltage signal of the system side at the specified time and the voltage signal of the load side i, and calculates the harmonic voltage amplitude E of the load side icThe harmonic voltage amplitude E of the system sidesHarmonic voltage phase angle difference between system side and load side iiAnd calculating a harmonic source judgment index of the power system, and determining whether a main harmonic source of the power system is a system side or a load side i, so as to obtain a specific harmonic source.
It should be noted that, a user may also input the harmonic source positioning instruction through the second instruction receiving module 322 of any load side monitoring device, and the second instruction receiving module 322 of the load side monitoring device transmits the harmonic source positioning instruction to the first instruction receiving module of the system side positioning device, so that the harmonic source positioning of the power system is achieved, without affecting the beneficial effects obtained by the present invention.
In a preferred embodiment, the harmonic source locating system 30 further comprises a wireless communication module;
the wireless communication module comprises a first wireless communication unit 314 and a second wireless communication unit 324; the first wireless communication unit 314 is disposed in the system-side positioning device 31 and connected to the first central control unit 313; the second wireless communication unit 324 is disposed in the load side monitoring device 32, and is connected to the second central control unit 323.
The wireless communication unit is used for realizing data transmission between the system side positioning device and the load side monitoring device. Specifically, the second wireless communication unit 324 is configured to send the voltage signal of the load side at the specified time, which is acquired by the second central control unit 323, to the first wireless communication unit 314; the first wireless communication unit 314 transmits the voltage signal of the load side to the first central control unit 313.
In a preferred embodiment, the harmonic source positioning system 30 further includes a GPS time service module;
the GPS time service module comprises a first GPS time service unit 315; the first GPS time service unit 315 is disposed in the system side positioning device, and is configured to provide a high-precision timestamp for the system side positioning device;
the GPS time service module also comprises a second GPS time service unit 325; the second GPS time service unit 325 is disposed in the load side monitoring device, and is configured to provide a high-precision timestamp for the load side monitoring device.
In the embodiment of the invention, the GPS time service module is used for acquiring a GPS second pulse clock signal of a global positioning system, so as to realize the calibration of internal clocks of a system side positioning device and a load side monitoring device and obtain a high-precision timestamp. By adopting the technical means of the embodiment of the invention, the system side positioning device and the load side monitoring device can realize wide-area time synchronization with the synchronization precision less than 10 mu s, so that the central control module can accurately acquire the voltage signal at the appointed moment after the system side positioning device and the load side monitoring device receive the harmonic source positioning instruction, and the positioning precision is further improved.
In a preferred embodiment, the harmonic source locating system 30 further comprises a data storage module;
the data storage module includes a first data storage unit 316 and a second data storage unit 326, the first data storage unit 316 is disposed in the system side positioning device and connected to the first central control unit 313, and the second data storage unit 326 is disposed in the load side monitoring device and connected to the second central control unit 323.
And the data storage module is used for storing the operating data, the collected data and the like of the harmonic source positioning system. Specifically, the first data storage unit 316 is configured to store a system-side voltage signal acquired by the system-side positioning device; the second data storage unit 326 is used for storing the voltage signal of the load side acquired by the load side monitoring device.
In a preferred embodiment, the harmonic source locating system 30 further includes a power module. The power module is mainly used for power management and power supply of the device.
Specifically, the power supply module includes a first power supply unit 317, and the first power supply unit is disposed in the system side positioning device and is configured to supply power to the system side positioning device; the power supply module further includes a second power supply unit 327, which is disposed in the load side monitoring device and is configured to supply power to the load side monitoring device.
As a preferred embodiment, the system side positioning apparatus further includes a first UART interface and a first USB interface; the load side monitoring device further comprises a second UART interface and a second USB interface.
Specifically, the UART interface is interconnected with the central control unit for enabling upgrading of the operating system and application programs of the device. The USB interface module is mutually connected with the central control unit and is used for realizing functions of data export, system upgrade and the like.
In a preferred embodiment, the system-side positioning device further includes a first display unit, and the load-side monitoring device further includes a second display unit. The display unit is used for providing a human-computer interaction interface and providing a query window for a positioning result for a user.
The third embodiment of the invention provides a harmonic source positioning system of an electric power system, wherein a system side positioning device is installed on a system side, a load side monitoring device is installed on a load side, and the system side positioning device and the load side monitoring device are respectively provided with a central control unit, a voltage signal acquisition unit, an instruction receiving unit, a wireless communication unit, a GPS time service unit, a data storage unit, a power supply unit and the like, so that the internal structure configuration of the system side positioning device and the load side monitoring device is perfected. When the system side positioning device and the load side monitoring device receive a harmonic source positioning instruction, voltage signals sampled by the system side and the load at the same time are obtained according to the specified time contained in the harmonic source positioning instruction, so that a harmonic source judgment index of the power system is calculated, and the harmonic source positioning of the power system is realized. The method can realize the positioning of the harmonic source without acquiring the system harmonic impedance of the electric power system, greatly simplifies the operation process of the positioning of the harmonic source of the electric power system, and improves the accuracy of the positioning of the harmonic source of the electric power system.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for locating a harmonic source of an electrical power system, comprising:
acquiring voltage signals of a load side and a system side of the power system in real time;
when a harmonic source positioning instruction is received, acquiring voltage signals of the load side and the system side at a specified time, and calculating to obtain the harmonic voltage amplitude of the load side, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side at the specified time;
calculating a harmonic source judgment index of the power system according to the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side;
and determining a main harmonic source of the power system according to the harmonic source determination index of the power system.
2. The method according to claim 1, wherein the calculating a harmonic source determination index of the power system according to the magnitude of the harmonic voltage amplitude of the load side, the magnitude of the harmonic voltage amplitude of the system side, and the harmonic voltage phase angle difference between the system side and the load side at the predetermined time specifically includes:
calculating a harmonic source determination index of the power system according to the harmonic voltage amplitude of the load side, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side at the specified time by the following calculation formula:
ΔE＝(1+b2)Ecsin2-2Esbsin；
wherein E iscThe amplitude of the harmonic voltage at the load side is obtained; esThe amplitude of the harmonic voltage at the system side is obtained; the harmonic voltage phase angle difference between the system side and the load side; phIs the active amount of harmonic power; qhIs the reactive amount of harmonic power.
3. The method according to claim 2, wherein the determining a main harmonic source of the power system according to the harmonic source determination index of the power system comprises:
judging whether the harmonic source judgment index is larger than zero;
when the harmonic source determination index is larger than zero, determining that a main harmonic source of the power system is a load side;
and when the harmonic source determination index is less than or equal to zero, determining that a main harmonic source of the power system is a system side.
4. A harmonic source locating system for an electrical power system, comprising: a voltage signal acquisition module, an instruction receiving module and a central control module, wherein,
the voltage signal acquisition module is used for acquiring voltage signals of a load side and a system side of the power system in real time;
the instruction receiving module is used for receiving a harmonic source positioning instruction;
the central control module is used for acquiring voltage signals of the load side and the system side at a specified time when a harmonic source positioning instruction is received, so as to calculate and obtain the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side;
calculating a harmonic source judgment index of the power system according to the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side;
and determining a main harmonic source of the power system according to the harmonic source determination index of the power system.
5. The harmonic source locating system of claim 4 in which the harmonic source locating system includes a system side locating device and a load side monitoring device; the system side positioning device is installed in a transformer substation of the power system, and the load side monitoring device is installed on a load side;
the voltage signal acquisition module comprises a first voltage signal acquisition unit and is used for acquiring voltage signals of a system side of the power system in real time;
the instruction receiving module comprises a first instruction receiving unit used for receiving a harmonic source positioning instruction;
the central control module comprises a first central control unit, and is used for acquiring a voltage signal of the system side at a specified moment according to the harmonic source positioning instruction received by the first instruction receiving unit; the harmonic source positioning instruction received by the first instruction receiving unit is sent to the load side monitoring device, so that the load side monitoring device returns a voltage signal of the load side at a specified time;
the first central control unit is further configured to:
calculating the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side according to the voltage signal of the system side and the voltage signal of the load side returned by the load side monitoring device;
calculating a harmonic source judgment index of the power system according to the harmonic voltage amplitude of the load side at the specified time, the harmonic voltage amplitude of the system side and the harmonic voltage phase angle difference between the system side and the load side;
determining a main harmonic source of the power system according to the harmonic source judgment index of the power system;
the first voltage signal acquisition unit, the first instruction receiving unit and the first central control unit are all arranged in the system side positioning device, and the first voltage signal acquisition unit and the first instruction receiving unit are respectively connected with the first central control unit.
6. The harmonic source locating system of claim 5 wherein the voltage signal acquisition module further comprises a second voltage signal acquisition unit for acquiring voltage signals on a load side of the power system in real time;
the instruction receiving module further comprises a second instruction receiving unit, which is used for receiving the harmonic source positioning instruction transmitted by the first instruction unit;
the central control module further comprises a second central control unit, which is used for acquiring a voltage signal of the load side at a specified moment according to the harmonic source positioning instruction received by the second instruction receiving unit and sending the voltage signal to the first central control unit;
the second voltage signal acquisition unit, the second instruction receiving unit and the second central control unit are arranged in the load side monitoring device; the second voltage signal acquisition unit and the second instruction receiving unit are respectively connected with the second central control unit.
7. The harmonic source locating system of claim 6 in which the harmonic source locating system further comprises a wireless communication module;
the wireless communication module comprises a first wireless communication unit and a second wireless communication unit; the first wireless communication unit is arranged in the system side positioning device and is connected with the first central control unit; the second wireless communication unit is arranged in the load side monitoring device and is connected with the second central control unit;
the second wireless communication unit is used for sending the voltage signal of the load side at the appointed moment to the first wireless communication unit.
8. The harmonic source locating system of the power system as claimed in any of claims 5 to 7, wherein the harmonic source locating system further comprises a GPS time service module;
the GPS time service module comprises a first GPS time service unit; the first GPS time service unit is arranged in the system side positioning device and used for providing a high-precision time stamp for the system side positioning device;
the GPS time service module also comprises a second GPS time service unit; the second GPS time service unit is arranged in the load side monitoring device and used for providing a high-precision time stamp for the load side monitoring device.
9. The harmonic source locating system of the power system of any of claims 5 to 7 further comprising a data storage module;
the data storage module comprises a first data storage unit, and the first data storage unit is arranged in the system side positioning device and used for storing the system side voltage signal acquired by the system side positioning device;
the data storage module further comprises a second data storage unit, and the second data storage unit is arranged in the load side monitoring device and used for storing the voltage signal of the load side acquired by the load side monitoring device.
10. The harmonic source locating system of the power system as claimed in any of claims 5 to 7, wherein the harmonic source locating system further comprises a power module;
the power supply module comprises a first power supply unit, and the first power supply unit is arranged in the system side positioning device and used for supplying power to the system side positioning device;
the power module further comprises a second power unit, and the second power unit is arranged in the load side monitoring device and used for supplying power to the load side monitoring device.
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