CN103236027A - Method for evaluating direct current magnetic biasing governance effect of transformer substations in regional power grid - Google Patents
Method for evaluating direct current magnetic biasing governance effect of transformer substations in regional power grid Download PDFInfo
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- CN103236027A CN103236027A CN2013101628155A CN201310162815A CN103236027A CN 103236027 A CN103236027 A CN 103236027A CN 2013101628155 A CN2013101628155 A CN 2013101628155A CN 201310162815 A CN201310162815 A CN 201310162815A CN 103236027 A CN103236027 A CN 103236027A
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Abstract
The invention relates to a method for evaluating a direct current magnetic biasing governance effect of transformer substations in a regional power grid. A plurality of transformer substations are contained in the regional power grid. The method comprises the following steps: 1) acquiring direct current magnetic biasing governance scheme information to be evaluated; 2) calculating the maximum direct current magnetic biasing current Ii in each phase of winding of a main transformer of each transformer substation in the regional power grid under each direct current magnetic biasing governance scheme, wherein i represents the i-th transformer substation; and 3) calculating a comprehensive evaluation result factor K of each direct current magnetic biasing governance scheme. Compared with the prior art, the method has the advantages of high reliability, simplicity in calculation and the like.
Description
Technical field
The present invention relates to a kind of DC magnetic biasing improvement technology, especially relate to the evaluation method of transforming plant DC magnetic bias regulation effect in a kind of regional power grid.
Background technology
In recent years, along with the enforcement of China's economic strategy, the East China becomes the core area of technology and economic development gradually, and electricity needs also increases day by day.Under this situation, many times UHV (ultra-high voltage), extra-high voltage direct-current circuit compile the Yangtze River Delta Area.System debug, overhaul or situation about breaking down under, D.C. high voltage transmission can adopt the method for operation of one pole ground return circuit.During the operation of the big earthed return of one pole in the ground current field can cause bigger influence to the electric current scope environment of flowing through.Huge DC current flows into the earth through direct current grounding pole, and causes earthy significant change in a big way.This earthy variation may exert an influence for the AC system of areal.
Electric power enterprises more both domestic and external taked the direct current restraining device over the ground in direct current suppress, though solved the problem of individual device, but can cause the variation of other substation equipment DC current in the electrical network, move the many-side influence that brings to AC network and can't effect a radical cure direct current one pole the earth.So, should consider to control the problem of distribution and the influence thereof of electric current the ground from the angle of system.For theoretical foundation being provided can for system's resolution, need a plurality of transforming plant DC magnetic bias of comprehensive assessment regional power grid inhibition, make overall plans to reach, the requirement of mobile equilibrium, the comprehensive regulation.
Summary of the invention
Purpose of the present invention is exactly the evaluation method that provides a kind of reliability height for the defective that overcomes above-mentioned prior art existence, calculates transforming plant DC magnetic bias regulation effect in the simple regional power grid.
Purpose of the present invention can be achieved through the following technical solutions:
The evaluation method of transforming plant DC magnetic bias regulation effect comprises a plurality of transformer stations in a kind of regional power grid in the described regional power grid, and this method may further comprise the steps:
1) obtains DC magnetic biasing resolution information to be assessed;
2) obtain positional information and the direct current resistance parameter of transformer station in the regional power grid, main transformer winding and transmission line of electricity network, calculate maximum DC magnetic bias current I in every phase winding of each transforming plant main transformer in each DC magnetic biasing resolution lower area electrical network
i, i represents i transformer station;
3) calculate the comprehensive evaluation result factor K of each DC magnetic biasing resolution:
In the formula, n participates in transformer station's number of evaluation, I
SiBe the tolerant DC magnetic bias current limit value of each transforming plant main transformer winding.
Described DC magnetic biasing resolution is included in the DC magnetic biasing current-limiting apparatus that the transforming plant main transformer neutral point is installed different resistances.
Described step 2) in, calculates maximum DC magnetic bias current in every phase winding of each transforming plant main transformer in each DC magnetic biasing resolution lower area electrical network by CDEGS software.
In step 3), K is more little for the comprehensive evaluation result factor, and regulation effect is more good.
Compared with prior art, the invention has the beneficial effects as follows: the present invention influences the result of calculation of situation according to the DC magnetic biasing of each interactional transformer station in the regional power grid, estimate the regulation effect of different DC magnetic biasing resolutions, evaluation result reliability height, and evaluation method is implemented simple.
Description of drawings
Fig. 1 is schematic flow sheet of the present invention.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.Present embodiment is that prerequisite is implemented with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the evaluation method of transforming plant DC magnetic bias regulation effect comprises a plurality of transformer stations in a kind of regional power grid in the described regional power grid, and this method may further comprise the steps:
In step S101, obtain DC magnetic biasing resolution information to be assessed, be included in the DC magnetic biasing current-limiting apparatus that the transforming plant main transformer neutral point is installed different resistances.
In step S102, obtain positional information and the direct current resistance parameter of transformer station, main transformer winding and transmission line of electricity network in the zone, utilize CDEGS software that it is carried out modeling, maximum DC magnetic bias current I in every phase winding of each transforming plant main transformer in each DC magnetic biasing resolution lower area electrical network of simulation calculation
i, i represents i transformer station.Administering each transforming plant DC magnetic bias of back influences the ground connection main transformer DC magnetic biasing impact evaluation that calculating section can adopt all electric pressures of electric system, also can adopt other softwares to calculate.
In step S103, calculate the comprehensive evaluation result factor K of each DC magnetic biasing resolution:
In the formula, n participates in transformer station's number of evaluation, I
SiBe the tolerant DC magnetic bias current limit value of each transforming plant main transformer winding, value can change according to actual conditions.
As shown from the above formula, K is more little for the comprehensive evaluation result factor, and regulation effect is more good.
Be the validity of example explanation the inventive method below with actual transforming plant DC magnetic bias improvement situation.
Near the regional power grid of one direct current earthing pole is arranged, contain 1 of 500kV AC Substation, 4 of 220kV AC Substation.500kV main transformer neutral point has been installed 3 ohm of DC magnetic biasing current-limiting apparatus, and existing 220kV station B and station C DC magnetic biasing influence are bigger, need take control measures, the assessment regulation effect.
Be shown as main transformer winding DC magnetic bias current in 220kV station B and station C each transformer station when all not taking control measures in the table 1:
Table 1 transformer station exchanges in the every phase winding of main transformer flows through DC magnetic bias current (unit: A)
| Transformer station's title | DC current (A) |
| The 500kV A that stands | 0.26 |
| The 220kV B that stands | 3.67 |
| The 220kV C that stands | 5.48 |
| The 220kV D that stands | 0.20 |
| The 220kV E that stands | 0.72 |
| The A main transformer of standing series connection winding | 3.72 |
Be shown as the DC magnetic biasing resolution combination that plan is taked station B and station C in the table 2:
Table 2 DC magnetic biasing resolution (adopts neutral point small resistor resistance, unit: Ω)
After calculating each scheme, respectively exchange DC magnetic bias current in the main transformer winding in the regional power grid, as shown in table 3:
The single-phase winding DC magnetic bias current of each main transformer of table 3 assessment result (unit: A)
The method for quantitatively evaluating that utilizes the present invention to propose draws the final comprehensive evaluation result factor of each scheme, in the example, and 500kV main transformer I
SiBe 4A, 220kV main transformer I
SiBe 6A, the result is as shown in table 4:
The single-phase winding DC magnetic biasing of each main transformer of table 4 regulation effect evaluation result
| ? | Scheme 1 | Scheme 2 | Scheme 3 | Scheme 4 | Scheme 5 | Scheme 6 | Scheme 7 | Scheme 8 | Scheme 9 |
| K | 0.501 | 0.496 | 0.496 | 0.460 | 0.456 | 0.456 | 0.449 | 0.445 | 0.446 |
Table 4 result shows the regulation effect of scheme 8, and best (the DC magnetic biasing influence that is each transformer station is comparatively average, there is not the outstanding especially transformer station of influence), the regulation effect of scheme 1 the poorest (having the relatively large transformer station of DC magnetic biasing influence), this is consistent with the above-mentioned operating mode that provides.
Claims (4)
1. the evaluation method of the interior transforming plant DC magnetic bias regulation effect of regional power grid comprises a plurality of transformer stations in the described regional power grid, it is characterized in that this method may further comprise the steps:
1) obtains DC magnetic biasing resolution information to be assessed;
2) obtain positional information and the direct current resistance parameter of transformer station in the regional power grid, main transformer winding and transmission line of electricity network, calculate maximum DC magnetic bias current I in every phase winding of each transforming plant main transformer in each DC magnetic biasing resolution lower area electrical network
i, i represents i transformer station;
3) calculate the comprehensive evaluation result factor K of each DC magnetic biasing resolution:
In the formula, n participates in transformer station's number of evaluation, I
SiBe the tolerant DC magnetic bias current limit value of each transforming plant main transformer winding.
2. the evaluation method of transforming plant DC magnetic bias regulation effect in a kind of regional power grid according to claim 1 is characterized in that described DC magnetic biasing resolution is included in the DC magnetic biasing current-limiting apparatus that the transforming plant main transformer neutral point is installed different resistances.
3. the evaluation method of transforming plant DC magnetic bias regulation effect in a kind of regional power grid according to claim 1, it is characterized in that, described step 2) in, calculates maximum DC magnetic bias current in every phase winding of each transforming plant main transformer in each DC magnetic biasing resolution lower area electrical network by CDEGS software.
4. the evaluation method of transforming plant DC magnetic bias regulation effect in a kind of regional power grid according to claim 1 is characterized in that in step 3), K is more little for the comprehensive evaluation result factor, and regulation effect is more good.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199274A (en) * | 2016-07-21 | 2016-12-07 | 国家电网公司 | A kind of D.C. magnetic biasing administers site selection method |
| CN107515339A (en) * | 2017-08-24 | 2017-12-26 | 广东电网有限责任公司电力科学研究院 | A kind of Risk Identification Method and system based on DC current distribution situation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002245227A (en) * | 2001-02-14 | 2002-08-30 | Osaka Gas Co Ltd | Evaluating system of business activity effect and method |
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- 2013-05-06 CN CN2013101628155A patent/CN103236027A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002245227A (en) * | 2001-02-14 | 2002-08-30 | Osaka Gas Co Ltd | Evaluating system of business activity effect and method |
Non-Patent Citations (1)
| Title |
|---|
| 傅晨钊，苏磊，赵丹丹: "《基于有限元分析的直流偏磁电流计算模型研究》", 《华东电力》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199274A (en) * | 2016-07-21 | 2016-12-07 | 国家电网公司 | A kind of D.C. magnetic biasing administers site selection method |
| CN107515339A (en) * | 2017-08-24 | 2017-12-26 | 广东电网有限责任公司电力科学研究院 | A kind of Risk Identification Method and system based on DC current distribution situation |
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