CN102496940B - Method and device for cable current-carrying capacity reactive compensation - Google Patents
Method and device for cable current-carrying capacity reactive compensation Download PDFInfo
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Abstract
The invention provides a method for cable current-carrying capacity reactive compensation, which includes steps of leading a to-be-tested cable to be connected into the secondary side of a straight-through current booster, leading a power capacitor to be connected into the primary side of the straight-through current booster and leading the straight-through current booster to be connected into a power supply; adjusting capacitance of the power capacitor and no-load voltage ratio of the straight-through current booster; obtaining capacitance of the power capacitor, power voltage value, no-load voltage ratio of the straight-through current booster and value of current flowing through the to-be-tested cable; calculating power of the to-be-tested cable, power of the straight-through current booster and power of the power capacitor according to obtained parameters; and judging whether the power of the power capacitor is equal to the sum of the power of the straight-through current booster and the power of the to-be-tested cable, and leading reactive compensation value of an electricity transmission cable to be allocated according to the capacitance of the power capacitor at this time if the power of the power capacitor is equal to the sum of the power of the straight-through current booster and the power of the to-be-tested cable. A device cable current-carrying capacity reactive compensation is further disclosed. The device cable current-carrying capacity reactive compensation can improve accuracy of calculation of the reactive power of the cable and reduce the reactive power of the cable.
Description
Technical field
The present invention relates to power transmission line power control field, be specifically related to a kind of current-carrying capacity of cable reactive-load compensation method and device.
Background technology
In DC circuit, the electrical power of (load) from power delivery to electrical equipment, is the product of voltage and electric current, the power that namely electric equipment reality absorbs.In alternating current circuit, because resistance and reactance (induction reactance and capacitive reactance) exist simultaneously, power delivery is to the electrical power of electric equipment not exclusively acting, because wherein some electrical power (electric energy that inductance and electric capacity are stored) still can feed back to power supply.The actual electrical power absorbing for equipment is active power.Reactive power is used for the exchange in circuit internal electric field and magnetic field, and is used for setting up and maintaining in electric equipment the electrical power in magnetic field.It is externally acting not, but changes other forms of energy into.Every electric equipment that has solenoid, set up magnetic field, will consume reactive power.
Cable, in running, because inductance characteristic causes a large amount of reactive power losses, has reduced active power, and then has increased the cost that cable is used.Use existing reactive-load compensation method, owing to affecting many factors and the complexity of cable reactive loss, actual cable reactive power compensation difficulty in computation is larger, and wattless power meter is not calculated accurately really.
Summary of the invention
The present invention proposes a kind of easy current-carrying capacity of cable reactive-load compensation method, can improve the accuracy of the calculating of cable reactive power, reduces the reactive power of cable.
Based on above-mentioned purpose, the technical scheme of employing is:
A reactive-load compensation method, comprises step:
(1) cable under test accessed to the secondary of punching current lifting device, power capacitor accessed to the former limit of punching current lifting device and by punching current lifting device access power supply;
(2) regulate the capacitance of power capacitor and the no-load voltage ratio of punching current lifting device;
(3) obtain capacitance, the supply voltage value of power capacitor, the no-load voltage ratio of punching current lifting device and flow through the current value of cable under test;
(4) according to the current value that flows through cable under test, calculate the reactive power of cable under test; According to the no-load voltage ratio of described punching current lifting device and the current value that flows through cable under test, calculate the reactive power of punching current lifting device; According to the reactive power of the capacitance of power capacitor and supply voltage value calculating power capacitor;
(5) whether the reactive power that judges power capacitor equals the reactive power of punching current lifting device and the reactive power sum of cable under test, if so, according to the reactive compensation capacitor of the capacitance configuration power transmission cable of power capacitor now.
The inventive method is carried out initialization by cable under test, punching current lifting device and power capacitor, builds circuit model; By after circuit model energising, constantly regulate the no-load voltage ratio of capacitance and the punching current lifting device of power capacitor; After each adjusting, obtain capacitance, the supply voltage value of power capacitor, the no-load voltage ratio of punching current lifting device and flow through the current value of cable under test; Then according to reactive power, the reactive power of punching current lifting device and the reactive power of power capacitor of the calculation of parameter cable under test obtaining; When cable under test reaches resonance, when the reactive power of power capacitor equals the reactive power of punching current lifting device and the reactive power sum of cable under test, the active power utilance that now power supply provides is the highest.The reactive compensation capacitor that is configured power transmission cable according to the capacitance of power capacitor now, can improve the accuracy of the calculating of cable reactive power, reduces the reactive power of cable.
The present invention proposes a kind of easy current-carrying capacity of cable reactive power compensator, can improve the accuracy of the calculating of cable reactive power, reduces the reactive power of cable.
Based on above-mentioned purpose, the technical scheme of employing is:
A reactive power compensator, comprising:
Initialization unit, for accessing cable under test the secondary of punching current lifting device, power capacitor is accessed to the former limit of punching current lifting device and by punching current lifting device access power supply;
Regulon, for regulating the no-load voltage ratio of capacitance and the punching current lifting device of power capacitor;
Acquiring unit, for obtaining capacitance, the supply voltage value of power capacitor, the no-load voltage ratio of punching current lifting device and flow through the current value of cable under test;
Computing unit, for calculating the reactive power of cable under test according to the current value that flows through cable under test; According to the no-load voltage ratio of described punching current lifting device and the current value that flows through cable under test, calculate the reactive power of punching current lifting device; According to the reactive power of the capacitance of power capacitor and supply voltage value calculating power capacitor;
Judging unit, for judging whether the reactive power of power capacitor equals the reactive power of punching current lifting device and the reactive power sum of cable under test;
Dispensing unit, for receiving the judged result of described judging unit, if the determination result is YES, the capacitance of basis power capacitor now configures the reactive compensation capacitor of power transmission cable.
In apparatus of the present invention, initialization unit utilizes cable under test, punching current lifting device and power capacitor to build circuit model; By after circuit model energising, regulon constantly regulates the no-load voltage ratio of capacitance and the punching current lifting device of power capacitor; After each adjusting, acquiring unit obtains capacitance, the supply voltage value of power capacitor, the no-load voltage ratio of punching current lifting device and flow through the current value of cable under test; Then computing unit is according to reactive power, the reactive power of punching current lifting device and the reactive power of power capacitor of the calculation of parameter cable under test obtaining; When judging unit judges that cable under test reaches resonance, when the reactive power of power capacitor equals the reactive power of punching current lifting device and the reactive power sum of cable under test, the active power utilance that now power supply provides is the highest.Dispensing unit is configured the reactive compensation capacitor of power transmission cable according to the capacitance of power capacitor now, can improve the accuracy of the calculating of cable reactive power, reduces the reactive power of cable.
Accompanying drawing explanation
Fig. 1 is a fact Example flow chart of the inventive method;
Fig. 2 is a circuit model structure chart of setting up in the inventive method;
Fig. 3 is a structural representation of apparatus of the present invention.
Embodiment
For ease of understanding the present invention, below in conjunction with accompanying drawing, set forth inventive concept.
A kind of current-carrying capacity of cable reactive-load compensation method that paper the present invention proposes, please refer to Fig. 1, comprises step:
101, carry out initialization;
Carry out after initialization, form a kind of circuit model as shown in Figure 2, cable under test is accessed to the secondary of punching current lifting device, power capacitor accessed to the former limit of punching current lifting device and by punching current lifting device access power supply.
102, regulate power capacitor and punching current lifting device;
Regulate the no-load voltage ratio of power capacitor capacitance and punching current lifting device.
103, obtain capacitance, the supply voltage value of power capacitor, the no-load voltage ratio of punching current lifting device and flow through the current value of cable under test;
104, according to reactive power, the reactive power of punching current lifting device and the reactive power of power capacitor of the calculation of parameter cable under test obtaining;
According to the current value that flows through cable under test, calculate the reactive power of cable under test; According to the no-load voltage ratio of punching current lifting device and the current value that flows through cable under test, calculate the reactive power of punching current lifting device; According to the reactive power of the capacitance of power capacitor and supply voltage value calculating power capacitor.
Whether the reactive power that 105, judges power capacitor equals the reactive power of punching current lifting device and the reactive power sum of cable under test;
Whether the reactive power that judges power capacitor equals the reactive power of punching current lifting device and the reactive power sum of cable under test, if so, carry out step 106.
106, according to the reactive compensation capacitor of the capacitance configuration power transmission cable of power capacitor.
According to the reactive compensation capacitor of the capacitance configuration power transmission cable of power capacitor now.
The inventive method is carried out initialization by cable under test, punching current lifting device and power capacitor, builds circuit model; By after circuit model energising, constantly regulate the no-load voltage ratio of capacitance and the punching current lifting device of power capacitor; After each adjusting, obtain capacitance, the supply voltage value of power capacitor, the no-load voltage ratio of punching current lifting device and flow through the current value of cable under test; Then according to reactive power, the reactive power of punching current lifting device and the reactive power of power capacitor of the calculation of parameter cable under test obtaining; When cable under test reaches resonance, when the reactive power of power capacitor equals the reactive power of punching current lifting device and the reactive power sum of cable under test, the active power utilance that now power supply provides is the highest.The reactive compensation capacitor that is configured power transmission cable according to the capacitance of power capacitor now, can improve the accuracy of the calculating of cable reactive power, reduces the reactive power of cable.
Wherein, step 104 is specifically as follows:
According to formula: Q
cable=ω L
cablei
2, L
cable=(L
i+ L
o) l
cableand L
o=2ln(D/r) calculate the reactive power of cable under test; Wherein, L
cablefor cable inductance, I is the current value that flows through cable under test; L
ifor feeling in cable unit length; L
ofor cable unit length diseases caused by external factors, D is cable axle base, and r is cable radius; l
cablefor cable length; ω=2 π f; F is punching current lifting device frequency;
According to formula:
the reactive power of calculating punching current lifting device, wherein, N is the coil turn of punching current lifting device, and μ is the iron core permeability of punching current lifting device, and S is the sectional area of the iron core magnetic loop of punching current lifting device, and l is the average length of the iron core magnetic loop of punching current lifting device; N is the no-load voltage ratio of punching current lifting device;
According to formula: Q
capacitor=ω CU
2calculate the reactive power of power capacitor; Wherein, U is supply voltage value, the capacitance that C is power capacitor.
While considering actual motion, the voltage of capacitor may be different from rated voltage, and the actual power that capacitor can compensate will, lower than rated power, can affect the reactive power compensation of cable; For head it off, above-described embodiment is done to following improvement:
In step 106, during according to the reactive compensation capacitor of the capacitance configuration power transmission cable of power capacitor now, first according to formula: Q
e=Q
n(U/U
n)
2calculate the reactive power of power capacitor under virtual voltage; Wherein, Q
efor the reactive power of power capacitor under virtual voltage, Q
nfor the rated power on capacitor nameplate, U
nfor capacitor rated voltage;
Calculate reactive power and the Q of power capacitor
eratio;
Electric capacity to power transmission cable configuration with this ratio corresponding number, each capacitance equates with the capacitance of power capacitor now.
Then introduce a kind of current-carrying capacity of cable reactive power compensator that the present invention proposes, please refer to Fig. 3, comprising:
Initialization unit T1, for accessing cable under test the secondary of punching current lifting device, power capacitor is accessed to the former limit of punching current lifting device and by punching current lifting device access power supply;
Regulon T2, for regulating the no-load voltage ratio of power capacitor capacitance and punching current lifting device;
Acquiring unit T3, for obtaining capacitance, the supply voltage value of power capacitor, the no-load voltage ratio of punching current lifting device and flow through the current value of cable under test;
Computing unit T4, for calculating the reactive power of cable under test according to the current value that flows through cable under test; According to the no-load voltage ratio of punching current lifting device and the current value that flows through cable under test, calculate the reactive power of punching current lifting device; According to the reactive power of the capacitance of power capacitor and supply voltage value calculating power capacitor;
Judging unit T5, for judging whether the reactive power of power capacitor equals the reactive power of punching current lifting device and the reactive power sum of cable under test;
Dispensing unit T6, for receiving the judged result of judging unit, if the determination result is YES, the capacitance of basis power capacitor now configures the reactive compensation capacitor of power transmission cable.
In apparatus of the present invention, initialization unit utilizes cable under test, punching current lifting device and power capacitor to build circuit model; By after circuit model energising, regulon constantly regulates the no-load voltage ratio of capacitance and the punching current lifting device of power capacitor; After each adjusting, acquiring unit obtains capacitance, the supply voltage value of power capacitor, the no-load voltage ratio of punching current lifting device and flow through the current value of cable under test; Then computing unit is according to reactive power, the reactive power of punching current lifting device and the reactive power of power capacitor of the calculation of parameter cable under test obtaining; When judging unit judges that cable under test reaches resonance, when the reactive power of power capacitor equals the reactive power of punching current lifting device and the reactive power sum of cable under test, the active power utilance that now power supply provides is the highest.Dispensing unit is configured the reactive compensation capacitor of power transmission cable according to the capacitance of power capacitor now, can improve the accuracy of the calculating of cable reactive power, reduces the reactive power of cable.
Concrete, when computing unit T4 calculates, according to formula:
Q
cable=ω L
cablei
2, L
cable=(L
i+ L
o) l
cableand L
o=2ln(D/r) calculate the reactive power of cable under test; Wherein, L
cablefor cable inductance, I is the current value that flows through cable under test; L
ifor feeling in cable unit length; L
ofor cable unit length diseases caused by external factors, D is cable axle base, and r is cable radius; l
cablefor cable length; ω=2 π f, f is punching current lifting device frequency;
And, according to formula:
the reactive power of calculating punching current lifting device, wherein, N is the coil turn of punching current lifting device, and μ is the iron core permeability of punching current lifting device, and S is the sectional area of the iron core magnetic loop of punching current lifting device, and l is the average length of the iron core magnetic loop of punching current lifting device; N is the no-load voltage ratio of punching current lifting device;
And, according to formula: Q
capacitor=ω CU
2calculate the reactive power of power capacitor; Wherein, U is supply voltage value, the capacitance that C is power capacitor.
While considering actual motion, the voltage of capacitor may be different from the rated voltage of capacitor, and the actual power that capacitor can compensate will, lower than rated power, can affect the reactive power compensation of cable; For head it off, above-mentioned Fig. 3 embodiment is done to following improvement:
When the capacitance of dispensing unit T6 basis power capacitor now configures the reactive compensation capacitor of power transmission cable, first according to formula: Q
e=Q
n(U/U
n)
2calculate the reactive power of power capacitor under virtual voltage, wherein, Q
efor the capacity of power capacitor under virtual voltage, Q
nfor the rated power on capacitor nameplate, U
nfor capacitor rated voltage; Calculate reactive power and the Q of power capacitor
eratio; Then the electric capacity with this ratio corresponding number to power transmission cable configuration, each capacitance equates with the capacitance of power capacitor now.
To sum up, the present invention can improve the accuracy of the calculating of cable reactive power, reduces the reactive power of cable, reduces line loss, reduces grid electricity fee cost.
Above embodiment of the present invention, does not form limiting the scope of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (6)
1. a current-carrying capacity of cable reactive-load compensation method, is characterized in that, comprises step:
(1) cable under test accessed to the secondary of punching current lifting device, power capacitor accessed to the former limit of punching current lifting device and by punching current lifting device access power supply;
(2) regulate the capacitance of power capacitor and the no-load voltage ratio of punching current lifting device;
(3) obtain capacitance, the supply voltage value of power capacitor, the no-load voltage ratio of punching current lifting device and flow through the current value of cable under test;
(4) according to the current value that flows through cable under test, calculate the reactive power of cable under test; According to the no-load voltage ratio of described punching current lifting device and the current value that flows through cable under test, calculate the reactive power of punching current lifting device; According to the reactive power of the capacitance of power capacitor and supply voltage value calculating power capacitor;
(5) whether the reactive power that judges power capacitor equals the reactive power of punching current lifting device and the reactive power sum of cable under test, if so, according to the reactive compensation capacitor of the capacitance configuration power transmission cable of power capacitor now.
2. current-carrying capacity of cable reactive-load compensation method according to claim 1, is characterized in that,
Described step (4) is specially:
According to formula: Q
cable=ω L
cablei
2, L
cable=(L
i+ L
o) l
cableand L
o=2ln(D/r) calculate the reactive power of cable under test; Wherein, L
cablefor cable inductance, I is the current value that flows through cable under test; L
ifor feeling in cable unit length; L
ofor cable unit length diseases caused by external factors, D is cable axle base, and r is cable radius; l
cablefor cable length; ω=2 π f; F is punching current lifting device frequency;
According to formula:
the reactive power of calculating punching current lifting device, wherein, N is the coil turn of punching current lifting device, and μ is the iron core permeability of punching current lifting device, and S is the sectional area of the iron core magnetic loop of punching current lifting device, and l is the average length of the iron core magnetic loop of punching current lifting device; N is the no-load voltage ratio of punching current lifting device;
According to formula: Q
capacitor=ω CU
2calculate the reactive power of power capacitor; Wherein, U is supply voltage value, the capacitance that C is power capacitor.
3. current-carrying capacity of cable reactive-load compensation method according to claim 2, is characterized in that,
When the capacitance of described basis power capacitor now configures the reactive compensation capacitor of power transmission cable, first according to formula: Q
e=Q
n(U/U
n)
2calculate the reactive power of power capacitor under virtual voltage; Wherein, Q
efor the reactive power of power capacitor under virtual voltage, Q
nfor the rated power on capacitor nameplate, U
nfor capacitor rated voltage;
Calculate reactive power and the described Q of described power capacitor
eratio;
Electric capacity to power transmission cable configuration with this ratio corresponding number, each capacitance equates with the capacitance of described power capacitor now.
4. a current-carrying capacity of cable reactive power compensator, is characterized in that, comprising:
Initialization unit, for accessing cable under test the secondary of punching current lifting device, power capacitor is accessed to the former limit of punching current lifting device and by punching current lifting device access power supply;
Regulon, for regulating the no-load voltage ratio of capacitance and the punching current lifting device of power capacitor;
Acquiring unit, for obtaining capacitance, the supply voltage value of power capacitor, the no-load voltage ratio of punching current lifting device and flow through the current value of cable under test;
Computing unit, for calculating the reactive power of cable under test according to the current value that flows through cable under test; According to the no-load voltage ratio of described punching current lifting device and the current value that flows through cable under test, calculate the reactive power of punching current lifting device; According to the reactive power of the capacitance of power capacitor and supply voltage value calculating power capacitor;
Judging unit, for judging whether the reactive power of power capacitor equals the reactive power of punching current lifting device and the reactive power sum of cable under test;
Dispensing unit, for receiving the judged result of described judging unit, if the determination result is YES, the capacitance of basis power capacitor now configures the reactive compensation capacitor of power transmission cable.
5. current-carrying capacity of cable reactive power compensator according to claim 4, is characterized in that,
Described computing unit is according to formula: Q
cable=ω L
cablei
2, L
cable=(L
i+ L
o) l
cableand L
o=2ln(D/r) calculate the reactive power of cable under test; Wherein, L
cablefor cable inductance, I is the current value that flows through cable under test; L
ifor feeling in cable unit length; L
ofor cable unit length diseases caused by external factors, D is cable axle base, and r is cable radius; l
cablefor cable length; ω=2 π f, f is punching current lifting device frequency;
And, according to formula:
the reactive power of calculating punching current lifting device, wherein, N is the coil turn of punching current lifting device, and μ is the iron core permeability of punching current lifting device, and S is the sectional area of the iron core magnetic loop of punching current lifting device, and l is the average length of the iron core magnetic loop of punching current lifting device; N is the no-load voltage ratio of punching current lifting device;
And, according to formula: Q
capacitor=ω CU
2calculate the reactive power of power capacitor; Wherein, U is supply voltage value, the capacitance that C is power capacitor.
6. current-carrying capacity of cable reactive power compensator according to claim 5, is characterized in that,
When the capacitance of described dispensing unit basis power capacitor now configures the reactive compensation capacitor of power transmission cable, first according to formula: Q
e=Q
n(U/U
n)
2calculate the reactive power of power capacitor under virtual voltage, wherein, Q
efor the reactive power of power capacitor under virtual voltage, Q
nfor the rated power on capacitor nameplate, U
nfor capacitor rated voltage; Calculate reactive power and the described Q of described power capacitor
eratio; Then to the electric capacity of power transmission cable configuration and this ratio corresponding number, each capacitance equates with the capacitance of described power capacitor now.
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| CN102842910B (en) * | 2012-09-07 | 2014-11-19 | 广东电网公司肇庆供电局 | Reactive power compensation method for overhead power transmission line |
| CN104678219B (en) * | 2015-02-10 | 2017-10-20 | 华南理工大学 | A kind of method that capacitance compensation based on cranking test system coordinates |
| CN104678218B (en) * | 2015-02-10 | 2018-04-13 | 华南理工大学 | A kind of evaluation method of cable rising test system optimal compensating electric capacity |
| CN104657609A (en) * | 2015-02-11 | 2015-05-27 | 华南理工大学 | Method for calculating current carrying capacity of directly-buried single-core cable considering soil local dryness |
| CN109426659A (en) * | 2017-08-25 | 2019-03-05 | 惠生（南通）重工有限公司 | The danger zone FLNG electricity instrument equipment intrinsic safety cable fast design method |
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