CN102818938B - Method for carrying out tracking measurement and control on ground distribution parameters of power grid by parameter shifting and phase changing method - Google Patents
Method for carrying out tracking measurement and control on ground distribution parameters of power grid by parameter shifting and phase changing method Download PDFInfo
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- CN102818938B CN102818938B CN201210277809.XA CN201210277809A CN102818938B CN 102818938 B CN102818938 B CN 102818938B CN 201210277809 A CN201210277809 A CN 201210277809A CN 102818938 B CN102818938 B CN 102818938B
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Abstract
The invention discloses a method for carrying out tracking measurement and control on ground distribution parameters of a power grid by a parameter shifting and phase changing method. A ground distributed capacitance and a ground distributed conductance of the power grid can be accurately subjected to tracking measurement only by switching the same bias device between any two phases of the power grid and measuring displacement voltages of a neutral point before and after switching; the method is simple to operate and has high measurement accuracy; required equipment has low cost; the method is suitable for a power grid system of which the neutral point is ineffectively grounded, the neutral point does not need to be used in the measuring process and the method has very wide application; in the method, the selection of bias components is diversified and not only can be single resistance, inductance or capacitance components, but also can be resistance-inductance or resistance-capacitance components and various selections are provided for selecting the bias devices on the industrial field.
Description
Technical field
What the present invention relates to is a kind of measurement and control method of electrical technology, and specifically distributed capacitance and the electricity that distributes are led the technology that accurate measurement is controlled to system with non-effectively earthed neutral electrical network over the ground.
Background technology
Power Network Neutral can be divided into two classes: a class is neutral-point solid ground (or through low-impedance earthed system) mode; Another kind of is neutral non-effective grounding mode, comprise isolated neutral, neutral point through high (in) resistance ground connection, neutral by arc extinction coil grounding, during this class earthing mode generation singlephase earth fault, ground current is less, healthy phases voltage is elevated to line voltage, but three-phase line voltage still balanced system still can move a period of time.
Capacitance current measurement method can be divided into four classes at present: a class is that direct method is by the single-phase direct ground connection of electrical network, and the equipment that this method is measured is simple, and measurement result is true, but can cause once higher superpotential harm, for the poor system of insulation, has greater risk, Equations of The Second Kind is that tuning method is applicable at the lower electrical network of natural degree of asymmetry, measure sensitivity in resonant earthed system, need to add biasing original paper to increase degree of unbalancedness, comprise two classes, one class is applicable to adjust continuously the arc suppression coil of sense as phase method, extremum method etc., by the measuring and adjusting of a certain parameter is approached gradually to full compensating coefficient, need Dui Xie mechanism to carry out repeatable operation, shorten the life-span of mechanical tuning device, another kind of is to carry out the tuning capacitance current of both directly having measured as two-point method according to capacitance current, three point method, displacement voltage curve method etc., every measurement capacitance current once, the necessary twice switching tap of arc suppression coil, the 3rd class is that additional capacitor method neutral point in the uncompensated situation of system seals in electric capacity, measures neutral point voltage and calculates capacitance current, and the method needs the artificial neutral point of manufacturing, and is not suitable for the system of isolated neutral, the 4th class is injection method, and by inject frequency variation signal measuring system capacitance current to system, the method needs equipment complicated, need choose suitable injected frequency and also to system, inject the harm of harmonic wave simultaneously.
Through the retrieval in prior art field is found, Chinese Patent Application No. is 200910044607.9, application publication number is CN101696984A, patent name is: single-phase measuring method and the device of capacitance current of distribution network, this patent by accessing the electric capacity of known dimensions in the arbitrary uniline of circuit, measurement is biased the phase voltage before and after electric capacity, can calculate three-phase ground capacitance, the method is not subject to the impact of neutral grounding mode, but the method cannot the measuring circuit active current that distributed resistance produces over the ground.
Summary of the invention
Technical matters: technical matters to be solved by this invention is to provide a kind of ginseng commutation method electrical network distribution parameter tracking measurement control method over the ground of moving, the present invention can realize distribute over the ground total capacitance and total electricity that distributes of electrical network and lead accurate measurement, be not subject to the impact of neutral grounding mode applied widely, eliminate the impact of nature degree of unbalancedness on measurement result, eliminate theoretical error, simple to operate, degree of accuracy is high, can measure in real time online.
Technical scheme: for solving with above-mentioned technical matters, the present invention proposes to move ginseng commutation method electrical network distribution parameter tracking measurement control method over the ground, and concrete steps are as follows:
Step a: access a bias device through electronic power switch or relay equipment at the arbitrary phase line-to-ground of grid power transmission circuit leading-out terminal (mains side), note access is M phase mutually, this bias device can be that the single original paper of resistance, inductance or electric capacity can be also resistance sense or capacitance-resistance original paper, and this bias device size known two ends equivalent admittance is
g m+
jY m, survey record neutral point voltage effective value and phase place
u 01,
;
Step b: controller cuts off bias device, then this bias device is accessed to arbitrary phase transmission line outlet end that electrical network is left two-phase through electronic power switch or relay equipment over the ground, note access is N phase mutually, from new measurement survey record neutral point voltage effective value and phase place
u 02,
;
Step c: through type 1 calculates electrical network total electricity that distributes and leads, and through type 2 calculates electrical network distribution total capacitances:
formula 1
formula 2
In upper two formulas
c Σ=
c a+
c b+
c cfor system distribution total capacitance,
g Σ=
g a+
g b+
g cfor system total electricity that distributes is led,
for the phase differential of residual voltage,
ωfor angular frequency,
for the line voltage of MN two-phase,
u mNfor line voltage effective value,
γfor phase angle, in formula
as follows respectively:
g 0for neutral point under neutral grounding mode over the ground between equivalent parallel electricity lead,
y 0for neutral point under neutral grounding mode over the ground between equivalent parallel hold or feel and receiving, neutral point over the ground equivalent admittance be
g 0+
jY 0,
g 0,
y 0known quantity: when isolated neutral
g 0=
y 0=0; When neutral point through high (in) resistance ground connection
y 0=0,
g 0for grounding conductance; When neutral by arc extinction coil grounding
g 0=0,
wherein
lfor arc suppression coil equivalent inductance; When neutral point, through arc suppression coil, also (string) damping ground connection is
g 0=
g l,
wherein
g lfor equivalent parallel electricity lead,
lfor equivalent parallel inductance;
Steps d: measure and finish rear electronic power switch or relay equipment pass cut-out bias device, when electrical network has switching line loop operation or the variation of electrical network distribution parameter to remeasure, start to repeat from step a.
Bias device equivalent admittance in the present invention
g m+
jY mselection should be selected according to electrical network parameter and computational accuracy: guarantee that on the one hand this bias device causes before and after switching that between electrical network two-phase neutral point displacement voltage is enough greatly to guarantee measuring accuracy, to prevent that on the other hand neutral point displacement voltage is excessive, in case the weak equipment that insulate is caused to overvoltage harm; The value of this bias device should meet
if this bias device is that capacitance-resistance original paper is got the inequality upper limit, gets inequality lower limit if this bias device is resistance sense original paper.
Beneficial effect: the ginseng commutation method of the moving electrical network that the present invention proposes is distribution parameter tracking measurement control method over the ground, only need be by same bias device switching between any two-phase of electrical network, measuring before and after switching neutral point displacement voltage can accurate tracking measure electrical network distributed capacitance and distribution electricity is led over the ground, simple to operate, measuring accuracy is high, needs equipment cost cheap; The network system of the applicable neutral non-effective grounding of the present invention, does not need to use neutral point during measurement, apply extremely extensive; In the present invention, by the selection diversification of bias device, can be that the single original paper of resistance, inductance or electric capacity can be also resistance sense or capacitance-resistance original paper, for choosing of industry spot bias device proposed Mutiple Choice.
Accompanying drawing explanation:
Fig. 1 moves ginseng commutation method electrical network distribution parameter tracking measurement control method circuit operation logic figure over the ground;
Fig. 2 moves ginseng commutation method electrical network distribution parameter tracking measurement control method control system process flow diagram over the ground.
Embodiment
For making technological means of the invention process, creation characteristic, technical scheme and advantage and effect more cheer and bright, below in conjunction with the accompanying drawing in the embodiment of the present invention, detailed embodiment and specific operation process have been provided.Those of ordinary skills are the simple change parameter under this method or do not make other embodiment of creative work only, also belongs to protection scope of the present invention.
Enforcement of the present invention can directly obtain electrical network bus residual voltage signal from PT secondary side, electrical network has ABC three-phase, and bias device of the present invention is switching between two-phase arbitrarily, and Fig. 1 is circuit operation logic figure, in figure, bias device switches between AC two-phase, and this bias device can be resistance
r m, inductance
l mor electric capacity
c msingle original paper can be also resistance sense or capacitance-resistance original paper; Fig. 2 is control system process flow diagram, and concrete implementation step is as follows:
Step is 1.: at grid power transmission circuit leading-out terminal, be that the arbitrary phase line-to-ground of mains side accesses a bias device through electronic power switch or relay equipment, note access is M phase mutually, and this bias device can be resistance
r m, inductance
l mor electric capacity
c msingle original paper can be also resistance sense or capacitance-resistance original paper, and this bias device size known two ends equivalent admittance is
g m+
jY m, survey record neutral point voltage effective value and phase place
u 01,
;
Step is 2.: controller cuts off bias device, then this bias device is accessed to arbitrary phase transmission line outlet end that electrical network is left two-phase through electronic power switch or relay equipment over the ground, note access is N phase mutually, from new measurement survey record neutral point voltage effective value and phase place
u 02,
;
Step is 3.: through type 3 calculates electrical networks total electricity that distributes and leads, and through type 4 calculates electrical network distribution total capacitances:
formula 3
formula 4
In upper two formulas
c Σ=
c a+
c b+
c cfor system distribution total capacitance;
g Σ=
g a+
g b+
g cfor system total electricity that distributes is led;
phase differential for residual voltage;
ωfor angular frequency;
for the line voltage of MN two-phase,
u mNfor line voltage effective value,
γfor phase angle; Take first access A access afterwards mutually C mutually as example
,
u aCfor AC line voltage,
; In formula
as follows respectively:
g 0for neutral point under neutral grounding mode over the ground between equivalent parallel electricity lead,
y 0for neutral point under neutral grounding mode over the ground between equivalent parallel hold or feel and receiving, neutral point over the ground equivalent admittance be
g 0+
jY 0,
g 0,
y 0known quantity: when isolated neutral
g 0=
y 0=0; When neutral point through high (in) resistance ground connection
y 0=0,
g 0for grounding conductance; When neutral by arc extinction coil grounding
g 0=0,
wherein
lfor arc suppression coil equivalent inductance; When neutral point, through arc suppression coil, also (string) damping ground connection is
g 0=
g l,
wherein
g lfor equivalent parallel electricity lead,
lfor equivalent parallel inductance;
Step is 4.: measure and finish rear electronic power switch or relay equipment and close and cut off bias device, when electrical network has switching line loop operation or electrical network distribution parameter to change need to remeasure, from step a, start to repeat.
Bias device equivalent admittance in the present invention
g m+
jY mselection should be selected according to electrical network parameter and computational accuracy: guarantee that on the one hand this bias device causes before and after switching that between electrical network two-phase neutral point displacement voltage is enough greatly to guarantee measuring accuracy, to prevent that on the other hand neutral point displacement voltage is excessive, in case the weak equipment that insulate is caused to overvoltage harm; The value of this bias device should meet
if this bias device is that capacitance-resistance original paper is got the inequality upper limit, gets inequality lower limit if this bias device is resistance sense original paper.
The derivation of above embodiment Chinese style 3, formula 4 is as follows:
In Fig. 1 circuit operation logic figure, first, by a bias device access electrical network M phase, record neutral point voltage effective value and phase place
u 01,
; Then this bias device is disconnected, then access electrical network N phase, M phase is mutually different from N, and the neutral point displacement voltage before and after switching is as follows:
In formula,
for the asymmetric vector of systematic parameter,
;
for system total electricity that distributes is led;
for system distribution total capacitance;
for A phase supply voltage,
be respectively the power supply phase voltage of bias device access phase;
g m+
jY mfor the equivalent admittance of bias device two ends;
g 0+
jY 0for the equivalent admittance over the ground under neutral grounding mode.
Upper two formulas are subtracted each other:
In formula
line voltage for switching two-phase
The system total capacitance that distributes is over the ground:
?
Solve
System distribute over the ground total electricity lead into:
?
Solve
Claims (2)
1. move a ginseng commutation method electrical network distribution parameter tracking measurement control method over the ground, it is characterized in that, comprise the following steps:
Step a: be that the arbitrary phase line-to-ground of mains side accesses a bias device through electronic power switch or relay equipment at grid power transmission circuit leading-out terminal, note access is M phase mutually, this bias device can be that the single original paper of resistance, inductance or electric capacity can be also resistance sense or capacitance-resistance original paper, and this bias device size known two ends equivalent admittance is
g m+
jY m, survey record neutral point voltage effective value and phase place
u 01,
;
Step b: controller cuts off bias device, then this bias device is accessed to arbitrary phase transmission line outlet end that electrical network is left two-phase through electronic power switch or relay equipment over the ground, note access is N phase mutually, from new measurement survey record neutral point voltage effective value and phase place
u 02,
;
Step c: through type 1 calculates electrical network total electricity that distributes and leads, and through type 2 calculates electrical network distribution total capacitances:
formula 1
formula 2
In upper two formulas
c Σ=
c a+
c b+
c cfor system distribution total capacitance,
g Σ=
g a+
g b+
g cfor system total electricity that distributes is led,
for the phase differential of residual voltage,
ωfor angular frequency,
for the line voltage of MN two-phase,
u mNfor line voltage effective value,
γfor phase angle, in formula
as follows respectively:
g 0for neutral point under neutral grounding mode over the ground between equivalent parallel electricity lead,
y 0for neutral point under neutral grounding mode over the ground between equivalent parallel hold or feel and receiving, neutral point over the ground equivalent admittance be
g 0+
jY 0,
g 0,
y 0known quantity: when isolated neutral
g 0=
y 0=0; When neutral point through high resistant or middle resistance ground connection
y 0=0,
g 0for grounding conductance; When neutral by arc extinction coil grounding
g 0=0,
wherein
lfor arc suppression coil equivalent inductance; When neutral point is during through arc suppression coil parallel connection or series damped ground connection,
g 0=
g l,
wherein
g lfor equivalent parallel electricity lead,
lfor equivalent parallel inductance;
Steps d: measure and finish rear electronic power switch or relay equipment pass cut-out bias device, when electrical network has switching line loop operation or the variation of electrical network distribution parameter to remeasure, start to repeat from step a.
2. a kind of ginseng commutation method electrical network distribution parameter tracking measurement control method over the ground of moving according to claim 1, is characterized in that bias device equivalent admittance in the present invention
g m+
jY mselection should be selected according to electrical network parameter and computational accuracy: guarantee that on the one hand this bias device causes before and after switching that between electrical network two-phase neutral point displacement voltage is enough greatly to guarantee measuring accuracy, to prevent that on the other hand neutral point displacement voltage is excessive, in case the weak equipment that insulate is caused to overvoltage harm; The value of this bias device should meet
if this bias device is that capacitance-resistance original paper is got the inequality upper limit, gets inequality lower limit if this bias device is resistance sense original paper.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103368167A (en) * | 2013-06-27 | 2013-10-23 | 刘宝稳 | Single-phase earth fault fundamental current full compensation device and method |
| CN103490405B (en) * | 2013-09-29 | 2015-09-23 | 张家港智电柔性输配电技术研究所有限公司 | A kind of autocontrol method of adjustable capacitive-based arc-suppression coil |
| CN106802361B (en) * | 2017-02-21 | 2019-03-29 | 国家电网公司 | A kind of capacitance current measurement method and system of distribution mixed connection ground connection operation |
| CN112067878B (en) * | 2020-09-02 | 2022-06-17 | 邯郸市科维电气有限公司 | Capacitance current on-line measuring method and device for secondary side bias capacitor of grounding transformer |
| CN113608033B (en) * | 2021-07-22 | 2024-01-23 | 国网河南省电力公司电力科学研究院 | High-precision wide-range power distribution network capacitance current testing method |
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