CN112600210A - Voltage self-adaptive adjustment method applied to low-voltage treatment device - Google Patents
Voltage self-adaptive adjustment method applied to low-voltage treatment device Download PDFInfo
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- CN112600210A CN112600210A CN202011198599.6A CN202011198599A CN112600210A CN 112600210 A CN112600210 A CN 112600210A CN 202011198599 A CN202011198599 A CN 202011198599A CN 112600210 A CN112600210 A CN 112600210A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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Abstract
The invention discloses a voltage self-adaptive adjusting method applied to a low-voltage governing device, which adopts the technical scheme that the low-voltage governing device is connected into a low-voltage tail end circuit, the parameters of the circuit are input, the circuit impedance is estimated, the voltage and the circuit current after voltage compensation are detected, the line partial pressure and the actual voltage of a user are deduced, and the target value of the compensation voltage and the trend of the compensation voltage are adjusted in real time through the deduced actual voltage of the user in the voltage compensation process of the compensating device, so that the voltage of the user can be compensated to be within a reasonable range in any installation position of the low-voltage governing device and the electricity utilization working condition of the user within the compensation capacity.
Description
Technical Field
The invention relates to the field of power quality management, in particular to a voltage self-adaptive adjusting method applied to a low-voltage management device.
Background
In a rural power grid platform area, especially in a remote mountain area, a phenomenon that a terminal line is too long and a terminal user is easy to generate insufficient power supply voltage during power utilization may exist. For such user low voltage problems, a low voltage abatement device needs to be used for abatement.
In the application of the low voltage treatment device, if the low voltage treatment device is installed at the tail end of the line, the target load voltage can be set to 220V, but due to the factors such as the convenience of the installation position of the line, the voltage compensation effect and the like, the low voltage treatment device may need to be installed at a certain position before the tail end, so that the load voltage cannot be directly obtained, and a target voltage value cannot be determined. The prior art solutions and prior art techniques that address the inability to obtain a load voltage and determine a target voltage value need to be supplemented with deficiencies or shortcomings that need to be contrasted with the advantages of the present invention.
Disclosure of Invention
In order to solve the defects or shortcomings of the prior art, the invention aims to provide a voltage self-adaptive adjusting method applied to a low-voltage governing device, which can be used for deducing a real load voltage value through line parameters and acquired voltage and current data, so that a voltage target value can be modified in real time, and further, the user voltage can be maintained in a reasonable range when the electricity consumption is changed.
In order to achieve the purpose, the method can be realized by the following technical scheme:
a voltage self-adaptive adjusting method applied to a low-voltage treatment device can infer a real load voltage value through line parameters and collected voltage and current data, so that a voltage target value can be modified in real time, and further, when power consumption changes, the voltage of a user can be still maintained within a reasonable range.
The method specifically comprises the following steps:
step 1: inputting parameters of a line according to the actual installation working condition of the site, and predicting the line impedance between the low-voltage treatment device and a user through the parameters;
step 2: collecting the voltage and the line current compensated by the low-voltage management device, and detecting the effective values and the real-time phases of the compensated voltage and the line current through an SOGI algorithm;
and step 3: calculating the voltage drop of the line according to the line impedance and the current information in the line;
and 4, step 4: calculating the amplitude of the real user voltage according to the amplitude and the phase of the voltage obtained by calculation and a triangular relation;
and 5: judging whether the current real user voltage amplitude exceeds the range according to the reasonable range of the user voltage, the current target voltage value and the compensation capability of the current equipment, if the current real user voltage is lower than the reasonable voltage range, entering a step 6, if the current real user voltage is higher than the reasonable voltage range, entering a step 7, otherwise, maintaining the current target voltage value;
step 6: improving the target voltage value, dynamically adjusting the compensation voltage, and repeating the step 2 to the step 5;
and 7: and reducing the target voltage value, dynamically adjusting the compensation voltage, and repeating the step 2 to the step 5.
The line parameters comprise line materials, the distance between a low-voltage governing point and a terminal user, the cross section area of a distribution line and the distance between a zero line and a phase line.
Further, the line impedance is estimated in the step 1, and the resistance of the line is estimated according to the line material, the line sectional area and the line length by adopting a classical line resistance and inductance calculation formula; and estimating the inductance of the line according to the length of the line, the sectional area of the line and the distance between the zero line and the live line.
The invention has the beneficial technical effects that: by the voltage self-adaptive adjusting method, low-voltage treatment can be carried out at any position of the line, and the voltage of a terminal user can be maintained within a reasonable range within the voltage compensation capacity of the low-voltage treatment device under any power utilization working condition, so that the voltage self-adaptive adjusting method is very suitable for the working condition that the voltage compensation device is installed at the middle position of the line.
Drawings
FIG. 1 is a topological diagram of the application of the low voltage abatement device of the voltage adaptive adjustment method applied to the low voltage abatement device of the present invention;
FIG. 2 is a flow chart of a voltage adaptive adjustment algorithm of the voltage adaptive adjustment method applied to the low voltage treatment device according to the present invention;
FIG. 3 is a user voltage estimation process of the voltage adaptive adjustment method applied to the low voltage abatement device of the present invention;
fig. 4 is a simulation result of voltage adaptive adjustment of the voltage adaptive adjustment method applied to the low voltage abatement device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1, a topology diagram of an application of a low voltage abatement device is shown, a power supply at a front end is a voltage equivalent power supply of a front end port of a tail end branch, the low voltage abatement device is connected to a tail end of a line in a series-parallel connection manner, and due to factors such as installation convenience and voltage compensation effect, the low voltage abatement device may be installed in a middle part (not necessarily 1/2) of the line, and in this installation environment, the voltage adaptive adjustment method provided by the present invention needs to be adopted.
Fig. 2 shows a flow chart of the adaptive voltage adjustment algorithm, which includes the following steps:
step 1: inputting the line material, the line length, the line sectional area and the zero-live line distance between the low-voltage treatment device and a user for predicting the line impedance, wherein:
the resistance of the line is calculated as: r ρ l/s, where ρ 31.5 Ω · mm for aluminum wire2Perkm, for copper wire, ρ 18.8 Ω · mm2/km；
The calculation formula of the inductance is as follows: l ═ mu0/2π)×ln(Deq/Ds)H/m，μ0＝4π×10-7H/m，DeqIs the zero line spacing, DsIs self-geometry mean distance;
step 2: collecting voltage and line current at the rear end of a low-voltage treatment device, calculating the amplitude of the voltage, real-time phase and the amplitude and real-time phase of the current, wherein the amplitude and the phase are fundamental wave components, and extracting the fundamental wave components can be generally carried out by adopting an SOGI algorithm and an SDFT algorithm, but the SDFT algorithm needs to buffer 1 period of sampling data, and the SOGI algorithm only needs to buffer a plurality of numerical values and can also meet the detection requirement, so the sampling SOGI algorithm in the method is used for extracting the fundamental wave components of the voltage and the current;
and step 3: calculating the voltage drop of the line, including the amplitude and the phase of the line voltage drop, according to the line impedance estimated in the step 1 and the fundamental wave component of the current detected in the step 2, and calculating the voltage amplitude of the user according to the vector operation according to the voltage detection result obtained in the step 2;
and 4, step 4: according to the relationship between the voltage amplitude of the user and the preset voltage range and the compensation condition of the current voltage, whether the voltage reference needs to be adjusted or not and the adjustment direction of the voltage reference are judged, and the method specifically comprises the following steps:
generally, the voltage deviation of the user is considered to be qualified when the voltage deviation is between-10% and + 7%, and then the estimated user voltage range can be set to be a qualified range from 210V to 230V according to factors such as the deviation of voltage estimation and the like; when the user voltage exceeds 230V, the target value of the voltage is reduced; when the voltage of the user is estimated to be lower than 210V during the stable compensation, if the compensation can be continued at the moment, the target value of the voltage is increased, and if the voltage reaches the upper compensation limit at the moment, the target value of the voltage is not changed.
As shown in FIG. 3, the estimation process of the user voltage is shown, since the voltage and current are detected by the SOGI algorithm, and the detected phase is a real-time angle, the invention uses the compensated voltage phase as a reference to establish a static coordinate system, wherein ILIs the magnitude of the line current and,
is the phase difference between the line current and the compensated voltage, ZLIs the magnitude of the impedance of the line,
is the phase of the line impedance, and the calculation method is arctan (X)T/R) so that the line partial pressure is UL＝IL·ZLThe phase of the line partial voltage relative to the compensated voltage is
The amplitude of the user voltage can be obtained according to the cosine law.
The accuracy of the method can be verified through modeling, as shown in fig. 4, the simulation result of the voltage self-adaptive adjustment is shown, and the estimated line impedance is real line impedance during simulation, so that the voltage drop calculation of the line is very accurate. According to the simulation result graph, when the load power changes, the actual load voltage can reach the set target voltage range only within the voltage compensation capacity of the low-voltage governing device, and therefore the accuracy and the feasibility of the method are proved.
The above-mentioned embodiments are illustrative of the specific embodiments of the present invention, and are not restrictive, and those skilled in the relevant art can make various changes and modifications to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention, so that all equivalent technical solutions should be included in the scope of the present invention.
Claims (4)
1. A voltage self-adaptive adjusting method applied to a low-voltage treatment device is characterized in that a real load voltage value can be deduced through line parameters and collected voltage and current data, so that a voltage target value can be modified in real time, and further, when power consumption is changed, user voltage can still be maintained within a reasonable range.
2. The voltage adaptive adjustment method applied to the low-voltage treatment device according to claim 1, which is characterized by comprising the following steps:
step 1: inputting line parameters according to the actual installation working condition of the site, and predicting the line impedance between the low-voltage treatment device and a user through the parameters;
step 2: collecting the voltage and the line current compensated by the low-voltage management device, and detecting the effective values and the real-time phases of the compensated voltage and the line current through an SOGI algorithm;
and step 3: calculating the voltage drop of the line according to the line impedance and the current information in the line;
and 4, step 4: calculating the amplitude of the real user voltage according to the amplitude and the phase of the voltage obtained by calculation and a triangular relation;
and 5: judging whether the current real user voltage amplitude exceeds the range according to the reasonable range of the user voltage, the current target voltage value and the compensation capability of the current equipment, if the current real user voltage is lower than the reasonable voltage range, entering a step 6, if the current real user voltage is higher than the reasonable voltage range, entering a step 7, otherwise, maintaining the current target voltage value;
step 6: improving the target voltage value, dynamically adjusting the compensation voltage, and repeating the step 2 to the step 5;
and 7: and reducing the target voltage value, dynamically adjusting the compensation voltage, and repeating the step 2 to the step 5.
3. The voltage adaptive adjustment method applied to the low voltage treatment device according to claim 1, wherein the line parameters in step 1 include line material, distance between the low voltage treatment point and the end user, cross-sectional area of the distribution line, and distance between the zero line and the phase line.
4. The voltage self-adaptive adjustment method applied to the low-voltage treatment device according to claim 1, wherein the resistance of the line is estimated in the step 1 by adopting a classical line resistance and inductance calculation formula and through line material, line sectional area and line length; and estimating the inductance of the line according to the length of the line, the sectional area of the line and the distance between the zero line and the live line.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113193562A (en) * | 2021-04-28 | 2021-07-30 | 青岛鼎信通讯股份有限公司 | Buck bus compensation method for tail-end low-voltage treatment device |
| CN114039355A (en) * | 2021-11-16 | 2022-02-11 | 国网湖南省电力有限公司 | Self-adaptive voltage control method and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110391664A (en) * | 2019-04-30 | 2019-10-29 | 江苏谷峰电力科技股份有限公司 | Suitable for remote 10kV distribution end low-voltage controlling device and method |
| CN111049149A (en) * | 2019-12-10 | 2020-04-21 | 东北电力大学 | Power grid terminal low voltage treatment method |
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- 2020-10-31 CN CN202011198599.6A patent/CN112600210A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110391664A (en) * | 2019-04-30 | 2019-10-29 | 江苏谷峰电力科技股份有限公司 | Suitable for remote 10kV distribution end low-voltage controlling device and method |
| CN111049149A (en) * | 2019-12-10 | 2020-04-21 | 东北电力大学 | Power grid terminal low voltage treatment method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113193562A (en) * | 2021-04-28 | 2021-07-30 | 青岛鼎信通讯股份有限公司 | Buck bus compensation method for tail-end low-voltage treatment device |
| CN114039355A (en) * | 2021-11-16 | 2022-02-11 | 国网湖南省电力有限公司 | Self-adaptive voltage control method and system |
| CN114039355B (en) * | 2021-11-16 | 2024-01-09 | 国网湖南省电力有限公司 | Self-adaptive voltage control method and system |
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Application publication date: 20210402 |