CN102148502A - Single machine alone net self-excitation judging method - Google Patents
Single machine alone net self-excitation judging method Download PDFInfo
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- CN102148502A CN102148502A CN2011100654774A CN201110065477A CN102148502A CN 102148502 A CN102148502 A CN 102148502A CN 2011100654774 A CN2011100654774 A CN 2011100654774A CN 201110065477 A CN201110065477 A CN 201110065477A CN 102148502 A CN102148502 A CN 102148502A
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Abstract
The invention discloses a single machine alone net self-excitation judging method, which mainly relates to the field of power systems. The method comprises the following steps of: measuring the real-time frequency of a single machine alone net system; calculating the equivalent ground capacitive reactance of the single machine alone net system, and ultimate direct axis reactance and ultimate quadrature axis reactance of a generator according to system parameters and real-time frequency of the single machine alone net system; when excitation regulation is not performed, judging the single machine alone net system may not produce self-excitation if the equivalent ground capacitive reactance is greater than the ultimate straight axis reactance,, otherwise judging the single machine alone net system may produce the self-excitation; and when the excitation regulation is performed, judging the single machine alone net system may not produce the self-excitation if the equivalent ground capacitive reactance is greater than the quadrature axis reactance, otherwise judging the single machine alone net system may produce the self-excitation. By the judging method, the single machine alone net system can be rapidly and conveniently judged whether to produce the self-excitation or not by utilizing the inherent electrical parameters and real-time frequency value of the single machine alone net system so as to effectively avoid power equipment damage accidents.
Description
Technical field
The present invention relates to field of power, the lonely net self-excitation of particularly a kind of unit method of discrimination.
Background technology
In electric power system, for the transmission system with series compensation, the subsynchronous electric current that flows through armature winding produces on rotor in the subsynchronous moment, also can induce subsynchronous electric current on rotor.At this moment, epitrochanterian subsynchronous electric current also can induce subsynchronous component of voltage on the stator armature winding.If the subsynchronous electric current on these subsynchronous component of voltages and the armature winding continue to interact, and help each other mutually and increase, finally will cause the generation of so-called " self-excitation " phenomenon.
Sichuan Province is the big province of China's HYDROELECTRIC ENERGY construction of base, is an important pivot of transferring electricity from the west to the east, the mutual confession in north and south.By in December, 2009, the unified installed capacity of Sichuan Electric Power Network reaches 3912.59 ten thousand kilowatts, and 2676.09 ten thousand kilowatts of water power account for 68.32% of total capacity, and wherein medium and small-scale water and electricity is its important part.The medium waterpower generator station in nine stones refined (Kowloon, asbestos, Yaan) in Sichuan and area, Mao County exploitation at present rapidly, the installed capacity of being incorporated into the power networks increases fast, formed the middle group of small power station compile step by step, concentrate boost, pattern that the large power long distance is sent outside.
But the water power group all is positioned at remote districts, and local load is few, generate electricity and can mainly outwards be delivered to the intensive area of the load that closes on.Simultaneously, the grid structures in these areas itself are also comparatively weak, bear the remote high-power task of sending electricity again, thus the ability that big disturbance is born by system a little less than.For the sending of the weak contact of this long distance, in case big disturbance (as important interconnection fault trip) takes place, system probably with big grid disconnection, form the lonely net of unit system.The lonely net of unit system may face a series of power grid operation problems by weave ins such as merit angle problem, FREQUENCY CONTROL problem and voltage control problems.Owing to the generating set self-excitation in the lonely net of the not enough unit that causes of the Hydropower Unit rated capacity system in the lonely net of the unit system might produce overvoltage, cause the power equipment damage accident.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: how the lonely net self-excitation of a kind of unit method of discrimination is provided, carries out anticipation so that whether the lonely net of unit system self-excitation can be taken place, avoid the power equipment damage accident to take place.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides the lonely net self-excitation of a kind of unit method of discrimination, the method comprising the steps of:
S100: the real-time frequency f that measures the lonely net of unit system;
S200:, calculate the equivalent capacitance to earth X of the lonely net of described unit system according to the system parameters and the described real-time frequency f of the lonely net of described unit system
C, generator d-axis limit reactance X
The d limitAnd generator is handed over axle limit reactance X
The q limit
S300: if there is not an excitation regulation, execution in step S400 then, otherwise execution in step S500;
S400: if described equivalent capacitance to earth X
CGreater than described d-axis limit reactance X
The d limit, judge that then the lonely net of described unit system self-excitation can not take place, otherwise self-excitation can take place in the lonely net of described unit system;
S500: if described equivalent capacitance to earth X
CGreater than described friendship axle limit reactance X
The q limit, judge that then the lonely net of described unit system self-excitation can not take place, otherwise self-excitation can take place in the lonely net of described unit system.
Preferably, the system parameters among the described step S200 comprises: the equivalence direct-to-ground capacitance number α of the lonely net of described unit system
CAnd relevant capacitance value x
C[k], the lonely net generator direct-axis synchronous reactance x of system of described unit
dWith quadrature axis synchronous reactance x
q
Wherein, k is equivalent direct-to-ground capacitance sequence number, 1≤k≤α
C
Preferably, described step S200 comprises step:
S201: described real-time frequency f is carried out standardization handle, obtain the mark one frequency values ω of the lonely net of described unit system;
S202:, calculate the equivalent capacitance to earth value X of the lonely net of described unit system according to the system parameters of the lonely net of described unit system
C
S203:, calculate the generator d-axis limit reactance X of the lonely net of described unit system according to the system parameters and the described mark one frequency values ω of the lonely net of described unit system
The d limitHand over axle limit reactance X with generator
The q limit
Preferably, the operational formula of the mark one frequency values ω of the lonely net of unit described in described step S201 system is as follows:
Preferably, the lonely net of unit described in described step S202 system equivalence capacitance to earth value X
COperational formula as follows:
Preferably, the generator d-axis limit reactance X of the lonely net of unit described in described step S203 system
The d limitOperational formula as follows:
X
The d limit=ω
2x
d
Preferably, the generator of the lonely net of unit described in described step S203 system is handed over axle limit reactance X
The q limitOperational formula as follows:
X
The q limit=ω
2x
q
Preferably, the lonely net of described unit system equivalence direct-to-ground capacitance comprises the equivalent parallel electric capacity of transmission line, and is connected in parallel on the building-out capacitor on the described transmission line.
(3) beneficial effect
The lonely net self-excitation of unit of the present invention method of discrimination, only utilize intrinsic electric parameter and its real-time frequency value of the lonely net of unit system, do not having excitation regulation or existing under two kinds of situations of excitation regulation, all whether the lonely net of anticipation unit system self-excitation can take place quickly and easily, thereby can effectively avoid because the power equipment infringement accident that the self-excitation overvoltage brings.
Description of drawings
Fig. 1 is the flow chart of the lonely net self-excitation of the described unit of embodiment of the invention method of discrimination;
Fig. 2 is the refinement flow chart of the step S200 of the lonely net self-excitation of the described unit of embodiment of the invention method of discrimination.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
Fig. 1 is the flow chart of the lonely net self-excitation of the described unit of embodiment of the invention method of discrimination.As shown in Figure 1, this method of discrimination may further comprise the steps:
S100: the real-time frequency f that measures the lonely net of unit system.
S200:, calculate the equivalent capacitance to earth X of the lonely net of described unit system according to the system parameters and the described real-time frequency f of the lonely net of described unit system
C, generator d-axis limit reactance X
The d limitWith a friendship axle limit reactance X
The q limitDescribed system parameters comprises: the equivalence direct-to-ground capacitance number α of the lonely net of described unit system
CAnd relevant capacitance value x
C[k], the lonely net generator direct-axis synchronous reactance x of system of described unit
dWith quadrature axis synchronous reactance x
qWherein, k is equivalent direct-to-ground capacitance sequence number, 1≤k≤α
CThe lonely net of described unit system equivalence direct-to-ground capacitance comprises the equivalent parallel electric capacity of transmission line, and is connected in parallel on the building-out capacitor on the described transmission line.
S300: do not have under the excitation regulation situation, if described equivalent capacitance to earth X
CGreater than described d-axis limit reactance X
The d limit, judge that then the lonely net of described unit system self-excitation can not take place, otherwise self-excitation can take place in the lonely net of described unit system; Exist under the excitation regulation situation, if described equivalent capacitance to earth X
CGreater than described friendship axle limit reactance X
The q limit, judge that then the lonely net of described unit system self-excitation can not take place, otherwise self-excitation can take place in the lonely net of described unit system.
Fig. 2 is the refinement flow chart of the step S200 of the lonely net self-excitation of the described unit of embodiment of the invention method of discrimination.As shown in Figure 2, step S200 specifically comprises step:
S201: described real-time frequency f is carried out standardization handle, obtain the mark one frequency values ω of the lonely net of described unit system, its operational formula is as follows:
S202:, calculate the equivalent capacitance to earth value X of the lonely net of described unit system according to the system parameters of the lonely net of described unit system
C, its operational formula is as follows:
S203:, calculate the generator d-axis limit reactance X of the lonely net of described unit system according to the system parameters and mark one frequency values of the lonely net of described unit system
The d limitWith a friendship axle limit reactance X
The q limit, its operational formula is respectively:
X
The d limit=ω
2x
d
X
The q limit=ω
2x
q
Described step S100, S200 and S300 can be carried out by computer automatic monitoring, and the output result of determination.
The lonely net self-excitation of the described unit of embodiment of the invention method of discrimination, only utilize intrinsic electric parameter and its real-time frequency value of the lonely net of unit system, do not having excitation regulation or existing under two kinds of situations of excitation regulation, all whether the lonely net of anticipation unit system self-excitation can take place quickly and easily, thereby can effectively avoid because the power equipment infringement accident that the self-excitation overvoltage brings.
Above execution mode only is used to illustrate the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make various variations and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (8)
1. the lonely net self-excitation of unit method of discrimination is characterized in that the method comprising the steps of:
S100: the real-time frequency f that measures the lonely net of unit system;
S200:, calculate the equivalent capacitance to earth X of the lonely net of described unit system according to the system parameters and the described real-time frequency f of the lonely net of described unit system
C, generator d-axis limit reactance X
The d limitAnd generator is handed over axle limit reactance X
The q limit
S300: if there is not an excitation regulation, execution in step S400 then, otherwise execution in step S500;
S400: if described equivalent capacitance to earth X
CGreater than described d-axis limit reactance X
The d limit, judge that then the lonely net of described unit system self-excitation can not take place, otherwise self-excitation can take place in the lonely net of described unit system;
S500: if described equivalent capacitance to earth X
CGreater than described friendship axle limit reactance X
The q limit, judge that then the lonely net of described unit system self-excitation can not take place, otherwise self-excitation can take place in the lonely net of described unit system.
2. method of discrimination as claimed in claim 1 is characterized in that, the system parameters among the described step S200 comprises: the equivalence direct-to-ground capacitance number α of the lonely net of described unit system
CAnd relevant capacitance value x
C[k], the lonely net generator direct-axis synchronous reactance x of system of described unit
dWith quadrature axis synchronous reactance x
q
Wherein, k is equivalent direct-to-ground capacitance sequence number, 1≤k≤α
C
3. method of discrimination as claimed in claim 2 is characterized in that, described step S200 comprises step:
S201: described real-time frequency f is carried out standardization handle, obtain the mark one frequency values ω of the lonely net of described unit system;
S202:, calculate the equivalent capacitance to earth value X of the lonely net of described unit system according to the system parameters of the lonely net of described unit system
C
S203:, calculate the generator d-axis limit reactance X of the lonely net of described unit system according to the system parameters and the described mark one frequency values ω of the lonely net of described unit system
The d limitHand over axle limit reactance X with generator
The q limit
4. method of discrimination as claimed in claim 3 is characterized in that, the operational formula of the mark one frequency values ω of the lonely net of unit described in described step S201 system is as follows:
5. method of discrimination as claimed in claim 3 is characterized in that, the equivalence capacitance to earth value X of the lonely net of unit described in described step S202 system
COperational formula as follows:
6. method of discrimination as claimed in claim 3 is characterized in that, the generator d-axis limit reactance X of the lonely net of unit described in described step S203 system
The d limitOperational formula as follows:
X
The d limit=ω
2x
d
7. method of discrimination as claimed in claim 3 is characterized in that, the generator of the lonely net of unit described in described step S203 system is handed over axle limit reactance X
The q limitOperational formula as follows:
X
The q limit=ω
2x
q
8. method of discrimination as claimed in claim 2 is characterized in that, the lonely net of described unit system equivalence direct-to-ground capacitance comprises the equivalent parallel electric capacity of transmission line, and is connected in parallel on the building-out capacitor on the described transmission line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110065477 CN102148502B (en) | 2011-03-17 | 2011-03-17 | Single machine isolated network self-excitation judging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110065477 CN102148502B (en) | 2011-03-17 | 2011-03-17 | Single machine isolated network self-excitation judging method |
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| CN102148502B CN102148502B (en) | 2013-03-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2150564Y (en) * | 1993-01-15 | 1993-12-22 | 清华大学电机工程与应用电子技术系 | Combined parametric testing device for electric power system |
| JP2002051465A (en) * | 2000-07-27 | 2002-02-15 | Toshiba Corp | Power supply method, power system controller and memory medium |
| CN101034809A (en) * | 2007-04-06 | 2007-09-12 | 清华大学 | Evaluation method for static voltage stability of the power system based on the dynamic continuous tide |
| US7605496B2 (en) * | 2004-05-11 | 2009-10-20 | Access Business Group International Llc | Controlling inductive power transfer systems |
| CN101609988A (en) * | 2008-06-20 | 2009-12-23 | 刘久贵 | A kind of large-capacity power carrying method and power transmission system thereof |
-
2011
- 2011-03-17 CN CN 201110065477 patent/CN102148502B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2150564Y (en) * | 1993-01-15 | 1993-12-22 | 清华大学电机工程与应用电子技术系 | Combined parametric testing device for electric power system |
| JP2002051465A (en) * | 2000-07-27 | 2002-02-15 | Toshiba Corp | Power supply method, power system controller and memory medium |
| US7605496B2 (en) * | 2004-05-11 | 2009-10-20 | Access Business Group International Llc | Controlling inductive power transfer systems |
| CN101034809A (en) * | 2007-04-06 | 2007-09-12 | 清华大学 | Evaluation method for static voltage stability of the power system based on the dynamic continuous tide |
| CN101609988A (en) * | 2008-06-20 | 2009-12-23 | 刘久贵 | A kind of large-capacity power carrying method and power transmission system thereof |
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