CN213458626U - Circuit analogue means based on distribution network real estate test platform - Google Patents
Circuit analogue means based on distribution network real estate test platform Download PDFInfo
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- CN213458626U CN213458626U CN202021023694.8U CN202021023694U CN213458626U CN 213458626 U CN213458626 U CN 213458626U CN 202021023694 U CN202021023694 U CN 202021023694U CN 213458626 U CN213458626 U CN 213458626U
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Abstract
The utility model provides a line simulation device based on a power distribution network real-time test platform, which comprises a transformer, a 10KV bus, a cable distribution line I, a cable distribution line II, an overhead line distribution line I, an overhead line distribution line II and a user; the transformer is electrically connected with the 10KV bus; one end of the cable distribution line I, one end of the cable distribution line II, one end of the overhead line distribution line I and one end of the overhead line distribution line II are electrically connected with the 10KV bus; the other ends of the cable distribution line I, the cable distribution line II, the overhead line distribution line I and the overhead line distribution line II are electrically connected with a user; in the device, a cable distribution line and an overhead line distribution line adopt a multi-pi type line model, and inductance and capacitance parameters of a cable simulation device and an overhead line simulation device are designed; the device can not only embody the distribution characteristics of the actual line, but also perform various fault experiments at a certain position of the line.
Description
Technical Field
The utility model relates to an electric power system field, specifically speaking relates to a circuit analogue means based on distribution network real estate test platform.
Background
Along with the development of the smart power grid, the intelligentization process of the power distribution network is gradually accelerated, and the influence of the power distribution network on the power system is more and more emphasized. The power distribution network is the tail end of electric energy transmission in the power system, and changes of the power distribution network can directly affect the whole power system, so that state estimation of the power system directly changes, for example, the power system can generate transient disturbance due to connection and disconnection of some power distribution networks with large loads, the power system can generate asynchronous oscillation, the stability of the power system is damaged, the whole power system is disconnected, and most areas are powered off. The end of the power distribution system is a power user and is a key link for controlling and ensuring the power supply quality. The accident of the power distribution network is a main cause of power failure of users, and the improvement of the power supply quality of a power system is mainly to improve the reliability of the power distribution network. The intellectualization of the power network is mainly embodied in the intellectualization of the power distribution network.
The development of the power system is changing day by day, the running state of the system is becoming more and more complex, new technology and new theory need to be verified, and the influence of the operation and the overhaul of the power equipment on the power system needs to be tested. The power supply reliability of the power system requires that the power system is not allowed to have power failure without reason, so most equipment tests of the power system cannot be directly carried out in a power grid of the power system, the equipment tests are simulated and simulated under laboratory conditions, and the equipment tests are applied to the power system after being tested and verified for many times. The ultrahigh calculation speed and precision of the current computer and the high precision of power electronic components ensure that the simulation can accurately simulate a power system. The accuracy of the simulation of the power system depends on the accuracy of the algorithm of the simulation system and the accuracy of each element model in the simulation system. Therefore, the research of various power system element models is the key of power system simulation.
The device of the power distribution network real-environment test platform comprises a transformer, a voltage transformer, a current transformer, a line, a load and the like. In order to simulate the actual state of the power distribution network, a part of equipment such as a voltage current transformer in the power distribution network actual environment test platform adopts actual equipment, and a transformer, a line and a load are approximately replaced by a physical model. Limited by the length of the line, the power distribution network real-time test platform cannot adopt a line model with equal length; if a simple centralized parameter model is adopted, part of transient signals can be lost in the transient process of the power distribution network real-time test platform. Therefore, a proper line model is needed to be found, which not only can meet certain distribution parameter characteristics of the line, achieve the fault line selection precision of the power distribution network real-time test platform, but also can be suitable for the characteristics of laboratory elements.
SUMMERY OF THE UTILITY MODEL
In order to solve the shortcomings of the prior art, the utility model aims to provide a circuit simulation device based on distribution network real-time testing platform to overcome the defect among the prior art.
In order to achieve the purpose, the utility model provides a line simulation device based on a power distribution network real-estate test platform, which comprises a transformer, a 10KV bus, a cable distribution line I, a cable distribution line II, an overhead line distribution line I, an overhead line distribution line II and a user; one end of the 10KV bus is electrically connected with the transformer, and the other end of the 10KV bus is electrically connected with the cable distribution line I, the cable distribution line II, the overhead line distribution line I and the overhead line distribution line II; one end of the cable distribution line I is electrically connected with the 10KV bus, and the other end of the cable distribution line I is electrically connected with a user; one end of the cable distribution line II is electrically connected with the 10KV bus, and the other end of the cable distribution line II is electrically connected with a user; one end of the overhead line distribution line I is electrically connected with the 10KV bus, and the other end of the overhead line distribution line I is electrically connected with a user; and one end of the overhead line distribution line II is electrically connected with the 10KV bus, and the other end of the overhead line distribution line II is electrically connected with a user.
Preferably, the cable distribution line I comprises a breaker and a 1km cable Lec12km cable Lec2(ii) a Wherein, the circuit breaker and the 1km cable Lec12km cable Lec2Are connected in series.
Preferably, the cable distribution line II comprises a breaker and a 2km cable Lec25km cable Lec5(ii) a Wherein, the circuit breaker and the 2km cable Lec25km cable LecAre connected in series.
Preferably, the overhead line distribution line I comprises a circuit breaker and a 1km overhead line Lol12km overhead line Lol25km overhead line Lol5(ii) a Wherein, the breaker and the 1km overhead line Lol12km overhead line Lol25km overhead line Lol5Are connected in series.
Preferably, the overhead line distribution line II comprises a circuit breaker and a 2km overhead line Lol25km overhead line Lol55km overhead line Lol5(ii) a Wherein, the breaker and the 2km overhead line Lol25km overhead line Lol55km overhead line Lol5Are connected in series.
Preferably, the 1km cable Lec12km cable Lec25km cable Lec51km overhead line Lol12km overhead line Lol2And 5km overhead line Lol5A multi-pi line model is adopted.
Compared with the prior art, the beneficial effects of the utility model are embodied in:
the utility model discloses a circuit analogue means based on distribution network real estate test platform not only can the certain distribution parameter characteristic of fully provided line, can reach distribution network real estate test platform trouble route selection precision moreover, can make the characteristics that the circuit model is fit for the laboratory component again simultaneously.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a line simulation device based on a power distribution network real-time testing platform according to the present invention;
fig. 2 is a schematic structural diagram of the cable distribution line i, the cable distribution line ii, the overhead line distribution line i, and the overhead line distribution line ii according to the present invention;
fig. 3 is a schematic structural diagram of the multi-pi line model of the present invention;
figure 4 is the utility model discloses a 1km cable L of cable analogue meansec12km cable Lec25km cable Lec5A schematic configuration of (a);
figure 5 is the utility model discloses an overhead line analogue means 1km overhead line Lol12km overhead line Lol2And 5km overhead line Lol5Schematic configuration of (a).
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Firstly, as shown in fig. 1, fig. 1 is a schematic structural diagram of a line simulation device based on a power distribution network real-time testing platform according to the present invention; the line simulation device comprises a transformer, a 10KV bus, a cable distribution line I, a cable distribution line II, an overhead line distribution line I, an overhead line distribution line II and a user; one end of the 10KV bus is electrically connected with the transformer, and the other end of the 10KV bus is electrically connected with the cable distribution line I, the cable distribution line II, the overhead line distribution line I and the overhead line distribution line II; one end of the cable distribution line I is electrically connected with the 10KV bus, and the other end of the cable distribution line I is electrically connected with a user; one end of the cable distribution line II is electrically connected with the 10KV bus, and the other end of the cable distribution line II is electrically connected with a user; one end of the overhead line distribution line I is electrically connected with the 10KV bus, and the other end of the overhead line distribution line I is electrically connected with a user; and one end of the overhead line distribution line II is electrically connected with the 10KV bus, and the other end of the overhead line distribution line II is electrically connected with a user.
Further, as shown in fig. 2, fig. 2 is the utility model discloses a cable distribution lines I, cable distribution lines II, overhead line distribution lines I and overhead line distribution lines II's schematic structure:
1) the cable distribution line I comprises a breaker and a 1km cable Lec12km cable Lec2(ii) a The circuit breaker and the 1km cable Lec12km cable Lec2Are connected in series.
2) The cable distribution line II comprises a breaker and a 2km cable Lec25km cable Lec5(ii) a The circuit breaker and the 2km cable Lec25km cable Lec5Are connected in series.
3) The overhead line distribution line I comprises a breaker and a 1km overhead line Lol12km overhead line Lol25km overhead line Lol5(ii) a The circuit breaker and the 1km overhead line Lol12km overhead line Lol25km overhead line Lol5Are connected in series.
4) The overhead line distribution line II comprises a circuit breaker and a 2km overhead line Lol25km overhead line Lol5, 5km overhead line Lol5(ii) a The circuit breaker and 2km overhead line Lol2、5kmOverhead line Lol55km overhead line Lol5Are connected in series.
Furthermore, please see FIG. 3, the 1km cable Lec12km cable Lec25km cable Lec51km overhead line Lol12km overhead line Lol2And 5km overhead line Lol5A multi-pi type circuit model is adopted; the structural schematic diagram of the multi-pi type circuit model is shown in fig. 3.
Cable simulator Lec1、Lec2、Lec5And overhead line simulator Lol1、Lol2、Lol5The principle of a multi-pi type circuit model is adopted:
the power line is one of the most important primary devices in the power distribution network, and the selection of a proper line model is very important for the whole power distribution network real-time test platform. According to the transmission characteristics of the line, there are mainly 4 line models: a single pi-type line model, a single T-type line model, a multi pi-type line model, a distributed parameter line model, and a frequency variation model.
The power distribution network real-time test platform needs to be capable of simulating the actual power distribution network operation condition and has the characteristics of the power distribution network, so that the selection of a line model is very critical. The single pi-type line model and the single T-type line model are not suitable for the element model of the power distribution network simulation system, because the two models are too simple in structure and only reflect the centralized characteristics of the lines, such as calculation of electric energy loss, steady-state voltage, reactive power and the like. In the steady state calculation of the power system, such as load flow calculation, state estimation, relay protection setting, voltage adjustment, frequency adjustment and the like, a single pi-type line model and a single T-type line model are mostly adopted. When the system has transient characteristics, the lumped parameter line model cannot reflect transient quantity, for example, when the system fails, the refraction and reflection of traveling waves in the line cannot occur in the single pi-type line model and the single T-type line model. Therefore, the power distribution network real-world test platform is not suitable for adopting a single pi-type line model and a single T-type line model. The distributed parameter line model (Bergeron line model) can accurately embody the characteristics of the line, but is not suitable for being used as an element model of a power distribution network real-world test platform under laboratory conditions. The frequency-varying model is represented by the frequency characteristic of the line parameter, can accurately represent the impedance parameter of the line in unit length, and is an accurate representation of the actual line. The traveling wave characteristics in the distribution line mainly lie in the aspects of inductance and capacitance. The study of frequency-dependent models is not yet fully developed.
The multi-Pi-shaped line model can reflect the distribution characteristics of lines, is easy to arrange fault points at the middle positions of the lines, and is suitable for cable simulation devices and overhead line simulation devices.
In addition, as shown in fig. 4 and 5, fig. 4 shows a 1km cable L of the cable simulation device of the present inventionec12km cable Lec25km cable Lec5A schematic configuration of (a); figure 5 is the utility model discloses an overhead line analogue means 1km overhead line Lol12km overhead line Lol2And 5km overhead line Lol5Schematic configuration of (a).
The configuration principle is as follows: because the space of the power distribution network real-environment test platform is limited, a line simulation device with the same length as an actual line is adopted for simulation. The line simulation device can not only embody the distribution characteristics of the actual line, but also perform various fault experiments at a certain position of the line. The line simulation device adopts a single-section pi-shaped equivalent circuit topology, and parameters of an inductance coil and a capacitor of the line simulation device are adjusted according to parameters in the single-section pi-shaped equivalent circuit.
In order to obtain the parameters of the line simulation device capable of simulating a line with a certain length, the corresponding parameters of the equivalent single-section pi-shaped line model are obtained firstly. Single section pi type circuit model resistance R, inductance L, capacitance C and uniform transmission line length L, unit length resistance RuInductance L per unit lengthuCapacitance per unit length CuThe relationship between them is:
when N is 1, the single-section pi-type circuit model parameters corresponding to the circuits with different lengths can be calculated by the formulas (1) to (3), and the circuit simulation device can perform inductance and capacitance configuration according to the corresponding single-section pi-type circuit model parameters.
In order to simulate actual lines with different lengths, a line simulation device capable of reflecting parameters of typical-length lines needs to be designed. In the power distribution network real-world test platform, 4 cable line simulation devices are arranged in total, and the total length of the simulation cable line is adjustable within 1 km-10 km; 6 sets of empty line simulation devices are configured in total, and the total length of the simulated overhead line is adjustable within 1 km-10 km. Meanwhile, parameter configuration of the cable and overhead line simulation device is obtained according to the requirements and theoretical analysis of the multi-pi type line model.
Finally, the utility model discloses a circuit analogue means based on distribution network real estate test platform, its specific technical characterstic as follows:
the line simulation device can not only fully meet the certain distribution parameter characteristics of the line, but also achieve the fault line selection precision of the power distribution network real-time test platform, and simultaneously enable the line model to be suitable for the characteristics of laboratory elements.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A line simulation device based on a power distribution network real-time test platform is characterized by comprising a transformer, a 10KV bus, a cable distribution line I, a cable distribution line II, an overhead line distribution line I, an overhead line distribution line II and a user; one end of the 10KV bus is electrically connected with the transformer, and the other end of the 10KV bus is electrically connected with the cable distribution line I, the cable distribution line II, the overhead line distribution line I and the overhead line distribution line II; one end of the cable distribution line I is electrically connected with the 10KV bus, and the other end of the cable distribution line I is electrically connected with a user; one end of the cable distribution line II is electrically connected with the 10KV bus, and the other end of the cable distribution line II is electrically connected with a user; one end of the overhead line distribution line I is electrically connected with the 10KV bus, and the other end of the overhead line distribution line I is electrically connected with a user; and one end of the overhead line distribution line II is electrically connected with the 10KV bus, and the other end of the overhead line distribution line II is electrically connected with a user.
2. The line simulator of claim 1, wherein the cable distribution line i comprises a circuit breaker, 1km cable Lec12km cable Lec2(ii) a Wherein, the circuit breaker and the 1km cable Lec12km cable Lec2Are connected in series.
3. The line simulator of claim 1, wherein the cable distribution line ii comprises a circuit breaker, 2km cable Lec25km cable Lec5(ii) a Wherein, the circuit breaker and the 2km cable Lec25km cable LecAre connected in series.
4. The line simulator of claim 1, wherein the overhead distribution line i comprises a circuit breaker, a 1km overhead line Lol12km overhead line Lol25km overhead line Lol5(ii) a Wherein, the breaker and the 1km overhead line Lol12km overhead line Lol25km overhead line Lol5Are connected in series.
5. The line simulator of claim 1, wherein the overhead distribution line ii comprises a circuit breaker, a 2km overhead line Lol25km overhead line Lol55km overhead line Lol5(ii) a Wherein, the breaker and the 2km overhead line Lol25km overhead line Lol55km overhead line Lol5Are connected in series.
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| CN202021023694.8U CN213458626U (en) | 2020-06-05 | 2020-06-05 | Circuit analogue means based on distribution network real estate test platform |
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| CN202021023694.8U CN213458626U (en) | 2020-06-05 | 2020-06-05 | Circuit analogue means based on distribution network real estate test platform |
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| CN213458626U true CN213458626U (en) | 2021-06-15 |
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Effective date of registration: 20220426 Address after: No.6-2, Minzhu Road, Xingning District, Nanning City, Guangxi Zhuang Autonomous Region, 530023 Patentee after: ELECTRIC POWER SCIENCE & RESEARCH INSTITUTE OF GUANGXI POWER GRID Corp. Patentee after: Guangxi Power Grid Energy Technology Co., Ltd Address before: No. 6-2, Minzhu Road, Nanning City, Guangxi Zhuang Autonomous Region Patentee before: ELECTRIC POWER SCIENCE & RESEARCH INSTITUTE OF GUANGXI POWER GRID Corp. |