CN104009480A - Reactive voltage control method and system based on reactive voltage control device - Google Patents
Reactive voltage control method and system based on reactive voltage control device Download PDFInfo
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- CN104009480A CN104009480A CN201410226458.9A CN201410226458A CN104009480A CN 104009480 A CN104009480 A CN 104009480A CN 201410226458 A CN201410226458 A CN 201410226458A CN 104009480 A CN104009480 A CN 104009480A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a reactive voltage control method and system based on a reactive voltage control device. The reactive voltage control device comprises a self-coupling transformer and a paralleling reactor, wherein the self-coupling transformer is used for carrying out on-load adjustment on voltage on the hydropower side, and the paralleling reactor is used for carrying out reactive compensation on the power grid side. A primary side coil of the self-coupling transformer is used for being connected with the power grid side, a secondary side coil of the self-coupling transformer is used for being connected with the hydropower side, and the paralleling reactor is used for being connected with the hydropower side. According to the reactive voltage control method and system, on the basis of the paralleling reactor and the self-coupling transformer, the voltage on the hydropower side can be controlled to be within a control interval, meanwhile, reactive power of the power grid side can be matched with the capacity of the paralleling reactor so that reactive power transmitted by hydropower can be absorbed, the situation that a large amount of reactive power is transmitted to a substation and line voltage is raised can be avoided, safety of electric equipment and power supply units is guaranteed and efficient operation of a power distribution network is facilitated.
Description
Technical field
The present invention relates to power technology field, particularly relate to a kind of voltage powerless control method and system based on voltage and reactive power control system.
Background technology
The mode of the capacity of hydroelectric power generation unit and access electrical network, the difference with the difference of regimen and installation location, the unit of installed capacity below 1000kVA, the electrical network of the 10kV circuit closing on by the access of T access way.On a river, same 10kV circuit may be accessed in a plurality of power stations, and what this caused line voltage distribution quality has the greatest impact.
When water power centralized power generation, gaining merit that circuit is unnecessary delivered to transformer station with idle by 10kV circuit.The concentrated access of water power, easily causes a large amount of idle sending, and the voltage of lifting 10kV circuit, affects normal electricity consumption step by step, even burns power supply and power consumption equipment.
Summary of the invention
Based on this, be necessary the water generating unit for access electrical network, the voltage of lifting 10kV circuit step by step when centralized power generation, the problem of affect normal electricity consumption, easily burning power supply and power consumption equipment, provides a kind of voltage powerless control method and system based on voltage and reactive power control system.
A kind of voltage powerless control method based on voltage and reactive power control system, voltage and reactive power control system comprises for the voltage of water power side being had to the autotransformer that carry to regulate and for grid side being carried out to the shunt reactor of reactive power compensation, the primary coil of described autotransformer is used for connecing described grid side, secondary coil is used for connecing described water power side, described shunt reactor is used for connecing described water power side, wherein, voltage powerless control method comprises the following steps:
Obtain respectively the voltage and current of described grid side and described water power side;
According to the voltage and current obtaining, calculate respectively reactive power and the active power of described grid side and described water power side;
Whether the reactive power that judges described grid side surpasses input threshold value;
If surpass, by described shunt reactor access water power side, and by described shunt reactor, grid side is carried out to reactive power compensation;
After preset period of time, again obtain respectively the voltage and current of described grid side and described water power side;
According to the voltage and current again obtaining, again calculate respectively reactive power and the active power of described grid side and described water power side;
Whether the reactive power of the described grid side that judgement calculates is again suitable with the capacity of described shunt reactor;
If quite, judge that the voltage of described water power side is whether in control interval;
If do not exist, according to the reactive power and the active power that again calculate, calculate active power and the reactive power of described autotransformer;
According to current gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and described autotransformer, calculate and adjust gear, and according to the adjustment gear calculating, adjust the gear of described autotransformer.
A kind of voltage powerless control system based on voltage and reactive power control system, voltage and reactive power control system comprises for the voltage of water power side being had to the autotransformer that carry to regulate and for grid side being carried out to the shunt reactor of reactive power compensation, the primary coil of described autotransformer is used for connecing described grid side, secondary coil is used for connecing described water power side, described shunt reactor is used for connecing described water power side, wherein, voltage powerless control system comprises:
The first acquiring unit, for obtaining respectively the voltage and current of described grid side and described water power side;
The first computing unit, for according to the voltage and current obtaining, calculates respectively reactive power and the active power of described grid side and described water power side;
The first judging unit, drops into threshold value for judging whether the reactive power of described grid side surpasses;
Reactive power compensation unit, while surpassing input threshold value for the reactive power in described grid side, by described shunt reactor access water power side, and carries out reactive power compensation by described shunt reactor to grid side;
Second acquisition unit, for after preset period of time, obtains respectively the voltage and current of described grid side and described water power side again;
The second computing unit, for according to the voltage and current again obtaining, calculates respectively reactive power and the active power of described grid side and described water power side again;
Whether the second judging unit is suitable with the capacity of described shunt reactor for judging the reactive power of the described grid side again calculating;
The 3rd judging unit, when suitable with the capacity of described shunt reactor for the reactive power of the described grid side again calculating, judges that the voltage of described water power side is whether in control interval;
The 3rd computing unit, not in control interval time, according to the reactive power again calculating and active power, calculates active power and the reactive power of described autotransformer for the voltage in described water power side;
The unit of transferring the files, be used for according to current gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and described autotransformer, calculate and adjust gear, and according to the adjustment gear calculating, adjust the gear of described autotransformer.
Above-mentioned voltage powerless control method and system based on voltage and reactive power control system, based on shunt reactor and autotransformer, can be by the voltage control of water power side in control interval, make the reactive power of grid side and the capacity matching of shunt reactor simultaneously, the reactive power of sending to absorb water power, can avoid a large amount of idle Dao Song transformer station, lifting line voltage distribution, and then guarantee the device security of power consumption equipment and power supply unit, be beneficial to the efficient operation of power distribution network.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that the present invention is based on voltage powerless control method first execution mode of voltage and reactive power control system;
Fig. 2 is the structural representation of voltage and reactive power control system the first execution mode of the present invention;
Fig. 3 is the schematic flow sheet that the present invention is based on voltage powerless control method second execution mode of voltage and reactive power control system;
Fig. 4 is the structural representation that the present invention is based on voltage powerless control system first execution mode of voltage and reactive power control system.
Embodiment
Refer to Fig. 1, Fig. 1 is the schematic flow sheet that the present invention is based on voltage powerless control method first execution mode of voltage and reactive power control system.
In the described voltage powerless control method based on voltage and reactive power control system of present embodiment, voltage and reactive power control system as shown in Figure 2, can comprise for the voltage of water power side being had to the autotransformer 100 that carry to regulate and for grid side being carried out to the shunt reactor 200 of reactive power compensation, the primary coil of autotransformer 100 is used for connecing described grid side, secondary coil is used for connecing described water power side, shunt reactor 200 is for connecing described water power side, wherein, voltage powerless control method comprises the following steps:
Step 101, obtains respectively the voltage and current of described grid side and described water power side.
Step 102, according to the voltage and current obtaining, calculates respectively reactive power and the active power of described grid side and described water power side.
Step 103, judges whether the reactive power of described grid side surpasses input threshold value.
Step 104, if surpass, by shunt reactor 200 access water power sides, and carries out reactive power compensation by 200 pairs of grid side of shunt reactor.
Step 105, after preset period of time, obtains respectively the voltage and current of described grid side and described water power side again.
Step 106, according to the voltage and current again obtaining, calculates respectively reactive power and the active power of described grid side and described water power side again.
Step 107, whether the reactive power of the described grid side that judgement calculates is again suitable with the capacity of shunt reactor 200.
Step 108, if quite, judges that the voltage of described water power side is whether in control interval.
Step 109, if do not exist, according to the reactive power and the active power that again calculate, calculates active power and the reactive power of autotransformer 100.
Step 110, according to current gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and autotransformer 100, calculate and adjust gear, and according to the adjustment gear calculating, adjust the gear of autotransformer 100.
The voltage powerless control method based on voltage and reactive power control system described in present embodiment, based on shunt reactor and autotransformer, can be by the voltage control of water power side in control interval, make the reactive power of grid side and the capacity matching of shunt reactor simultaneously, the reactive power of sending to absorb water power, can avoid a large amount of idle Dao Song transformer station, lifting line voltage distribution, and then guarantee the device security of power consumption equipment and power supply unit, be beneficial to the efficient operation of power distribution network.
Voltage and reactive power control system of the present invention preferably can be used for containing online water power 10kV circuit, by the voltage control of water power side in control interval (10.7kV～9.3kV).
Wherein, for step 101, described voltage is preferably three-phase voltage, and described electric current is preferably three-phase current, can, by being arranged on respectively the voltage transformer summation current transformer of described grid side and described water power side, measure respectively the voltage and current of described grid side and described water power side.
For described voltage and reactive power control system, as shown in Figure 2, also can comprise five K switch 1-K5, described grid side is connected by the first K switch 1 with described primary coil, described secondary coil can be connected by second switch K2 with described water power side, described grid side is connected by the 3rd K switch 3 with described water power side, is parallel with the 4th K switch 4 between the input of shunt reactor 200 and output, and the input of shunt reactor 200 accesses described water power side by the 5th K switch 5 and second switch K2.Preferably, five K switch 1-K5 can be vacuum switch or on-load switch.
For autotransformer 100, output and input share the special transformer of one group of coil (main coil and voltage regulation coil).Boost and realize with different taps with step-down, than sharing the part tap voltage that coil is few, just reduce, than sharing the part tap voltage that coil is many, just raise.The spacing of number of taps and different taps can need pre-configured according to pressure regulation.
Autotransformer 100 preferably includes a winding, when using as step-down transformer, extracts a part of wire turn out as secondary winding from winding, when using as step-up transformer, applied voltage be only added in winding-part wire turn on.Conventionally belong to once simultaneously, call common winding with the part winding of secondary, the remainder of autotransformer 100 is called series connection winding, with the autotransformer of capacity, compares with common transformer, not only size is little, and efficiency is high, and transformer capacity is larger, and voltage is higher.This advantage is just all the more outstanding.
Preferably, between the short-circuit resistance R of autotransformer 100, short-circuit reactance X, no-load voltage ratio n, current operational taps MnHe center gear M0, there is following relation:
n＝U1N×(1-(Mn-M0)×d％)/U2N；
Wherein, d% is span (one grade of every tune, the percent change of no-load voltage ratio), and U1N is the autotransformer 100 side rated voltage that gets access to grid, and U2N is autotransformer 100 water receiving electricity/load side rated voltages.
Preferably, described water power side also can be described as load side.
In concrete operation, by Switch State Combination in Power Systems, the operating state of switchable apparatus:
Bypass condition: K1, K2, K4, K5 disconnect, and K3 is closed.Install not chargedly, can carry out device maintenance, maintenance; Pressure regulation state: K3, K5, K4 disconnect, and K1, K2 are closed; Reactive power compensation state: K3, K4 disconnect, K1, K2, K5 closure.
Preferably, also can comprise the superpotential lightning arrester Z generating for limiting shunt reactor 200, lightning arrester Z is in parallel with shunt reactor 200.Lightning arrester Z can be zinc oxide arrester.
Preferably, described grid side can be equipped with current transformer and voltage transformer.
Preferably, described water power side can be equipped with current transformer and voltage transformer.
Preferably, the unit of described water power side can be by the described grid side of T access way access 10kV circuit.
For step 102, described active power is preferably three phases active power, and described reactive power is preferably three phases active power.
For step 103, described input threshold value is predefined for determining whether the logical criterion of shunt reactor 200 and water power side joint.
In one embodiment, whether over after dropping into the step of threshold value, further comprising the steps of in the described reactive power that judges described grid side:
If the reactive power of described grid side does not surpass described input threshold value, according to reactive power and the active power of described grid side and described water power side, obtain active power and the reactive power of autotransformer 100;
According to current gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and autotransformer 100, calculate and adjust gear, and according to the adjustment gear calculating, adjust the gear of autotransformer 100.
For step 104, can shunt reactor 200 be accessed to water power sides by Closing Switch K2 and K5.
For step 105, described preset period of time was preferably the time delay period, as 30 seconds.
For step 106, the method for calculating active power and reactive power is preferably identical with step 102.
For step 107, the capacity of shunt reactor 200 is preferably can be according to the concrete condition configuration of the circuit containing online water power.
Further, can, according to criterion :-0.15< (1-grid side reactive power reduction/reactive compensation capacity) <0.15, judge that whether the reactive power of described grid side is suitable with the capacity of shunt reactor 200.
In one embodiment, after whether suitable with the capacity of shunt reactor 200 step of the reactive power of the described grid side again calculating in described judgement, further comprising the steps of:
If it is not suitable, circulate in after preset period of time, obtain respectively the voltage and current of described grid side and described water power side, and according to the voltage and current obtaining, calculate respectively reactive power and the active power of described grid side and described water power side, until the capacity of the reactive power of the described grid side calculating and shunt reactor 200 is suitable.
For step 108, described control interval is preferably 10kV-10.7kV, and the voltage of grid side described in this step is the voltage again obtaining in step 105.
In one embodiment, whether after the step in control interval, further comprising the steps of at the described voltage that judges described water power side:
If, the idle control operation of final voltage.
For step 110, the voltage threshold of described water power side is preferably 10.0kV-10.7kV.The tap corresponding to different gears of autotransformer.The spacing of number of taps and different taps can need pre-configured according to pressure regulation.The voltage of grid side described in this step is the voltage again obtaining in step 105.
In one embodiment, after the step of the gear of the adjustment gear adjustment autotransformer 200 calculating in described basis, further comprising the steps of:
After the second preset period of time, obtain the voltage of described water power side, and the voltage that judges described water power side is whether in control interval;
If, the idle control operation of final voltage.
Preferably, described the second preset period of time is time delay 30 seconds.
In another embodiment, described according to the voltage of the voltage threshold of described water power side, described grid side and autotransformer 100 center gear, short-circuit resistance, short-circuit reactance, active power and reactive power, the step of calculating adjustment gear comprises the following steps:
By the voltage of the voltage threshold of described water power side, described grid side and autotransformer 100 center gear, short-circuit resistance, short-circuit reactance, active power and reactive power substitution the following stated formula, calculate and adjust gear:
Wherein, M
zfor adjusting gear, P is active power, and Q is reactive power, U
t_UPfor the voltage threshold of described water power side, R is short-circuit resistance, and X is short-circuit reactance, and d% is span, M
0for described center gear, U
1voltage for described grid side.
Preferably, described center gear can be the gear that no-load voltage ratio is 1:1, the gear of described adjustment gear for adjusting to.According to the current gear of described adjustment gear and autotransformer 100, can calculate the gear number that needs to adjust (raise or lower).
Referring to Fig. 3, is the schematic flow sheet that the present invention is based on voltage powerless control method second execution mode of voltage and reactive power control system shown in Fig. 3.
The voltage powerless control method based on voltage and reactive power control system described in present embodiment and the difference of the first execution mode are: described according to described water power side voltage threshold, the voltage of described grid side and current gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of autotransformer 100, calculate and adjust gear, and comprise the following steps according to the step of the gear of the adjustment gear adjustment autotransformer 100 calculating:
Step 201, whether the voltage that judges described water power side is higher than the voltage threshold of described water power side.
Step 202, if higher than, according to the voltage of the voltage threshold of described water power side, described grid side and autotransformer 100 center gear, short-circuit resistance, short-circuit reactance, active power and reactive power, calculate and adjust gear, and according to the adjustment gear calculating, lower the gear of autotransformer 100.
Step 203, if not higher than, according to the voltage of the voltage threshold of described water power side, described grid side and autotransformer 100 center gear, short-circuit resistance, short-circuit reactance, active power and reactive power, calculate and adjust gear, and according to the adjustment gear calculating, raise the gear of autotransformer 100.
The voltage powerless control method based on voltage and reactive power control system described in present embodiment, can determine the gear direction that needs adjustment fast, the convenient gear of adjusting.
Refer to Fig. 4, Fig. 4 is the structural representation that the present invention is based on voltage powerless control system first execution mode of voltage and reactive power control system.
In the described voltage powerless control system based on voltage and reactive power control system of present embodiment, voltage and reactive power control system as shown in Figure 2, can comprise for the voltage of water power side being had to the autotransformer 100 that carry to regulate and for grid side being carried out to the shunt reactor 200 of reactive power compensation, the primary coil of autotransformer 100 is used for connecing described grid side, secondary coil is used for connecing described water power side, shunt reactor 200 is for connecing described water power side, wherein, voltage powerless control system comprises the first acquiring unit 1010, the first computing unit 1020, the first judging unit 1030, reactive power compensation unit 1040, second acquisition unit 1050, the second computing unit 1060, the second judging unit 1070, the 3rd judging unit 1080, the 3rd computing unit 1090 and the unit 1100 of transferring the files, wherein:
The first acquiring unit 1010, for obtaining respectively the voltage and current of described grid side and described water power side.
The first computing unit 1020, for according to the voltage and current obtaining, calculates respectively reactive power and the active power of described grid side and described water power side.
The first judging unit 1030, drops into threshold value for judging whether the reactive power of described grid side surpasses.
Reactive power compensation unit 1040, while surpassing input threshold value for the reactive power in described grid side, by shunt reactor 200 access water power sides, and carries out reactive power compensation by 200 pairs of grid side of shunt reactor.
Second acquisition unit 1050, for after preset period of time, obtains respectively the voltage and current of described grid side and described water power side again.
The second computing unit 1060, for according to the voltage and current again obtaining, calculates respectively reactive power and the active power of described grid side and described water power side again.
Whether the second judging unit 1070 is suitable with the capacity of shunt reactor 200 for judging the reactive power of the described grid side again calculating.
The 3rd judging unit 1080, when suitable with the capacity of shunt reactor 200 for the reactive power of the described grid side again calculating, judges that the voltage of described water power side is whether in control interval.
The 3rd computing unit 1090, not in control interval time, according to the reactive power again calculating and active power, calculates active power and the reactive power of autotransformer 100 for the voltage in described water power side.
The unit 1100 of transferring the files, be used for according to current gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and autotransformer 100, calculate and adjust gear, and according to the adjustment gear calculating, adjust the gear of autotransformer 100.
The voltage powerless control system based on voltage and reactive power control system described in present embodiment, based on shunt reactor and autotransformer, can be by the voltage control of water power side in control interval, make the reactive power of grid side and the capacity matching of shunt reactor simultaneously, the reactive power of sending to absorb water power, can avoid a large amount of idle Dao Song transformer station, lifting line voltage distribution, and then guarantee the device security of power consumption equipment and power supply unit, be beneficial to the efficient operation of power distribution network.
Wherein, for the first acquiring unit 1010, described voltage is preferably three-phase voltage, described electric current is preferably three-phase current, can, by being arranged on respectively the voltage transformer summation current transformer of described grid side and described water power side, measure respectively the voltage and current of described grid side and described water power side.
For described voltage and reactive power control system, as shown in Figure 2, also can comprise five K switch 1-K5, described grid side is connected by the first K switch 1 with described primary coil, described secondary coil can be connected by second switch K2 with described water power side, described grid side is connected by the 3rd K switch 3 with described water power side, is parallel with the 4th K switch 4 between the input of shunt reactor 200 and output, and the input of shunt reactor 200 accesses described water power side by the 5th K switch 5 and second switch K2.Preferably, five K switch 1-K5 can be vacuum switch or on-load switch.
For autotransformer 100, output and input share the special transformer of one group of coil (main coil and voltage regulation coil).Boost and realize with different taps with step-down, than sharing the part tap voltage that coil is few, just reduce, than sharing the part tap voltage that coil is many, just raise.The spacing of number of taps and different taps can need pre-configured according to pressure regulation.
Autotransformer 100 preferably includes a winding, when using as step-down transformer, extracts a part of wire turn out as secondary winding from winding, when using as step-up transformer, applied voltage be only added in winding-part wire turn on.Conventionally belong to once simultaneously, call common winding with the part winding of secondary, the remainder of autotransformer 100 is called series connection winding, with the autotransformer of capacity, compares with common transformer, not only size is little, and efficiency is high, and transformer capacity is larger, and voltage is higher.This advantage is just all the more outstanding.
Preferably, between the short-circuit resistance R of autotransformer 100, short-circuit reactance X, no-load voltage ratio n, current operational taps MnHe center gear M0, there is following relation:
n＝U1N×(1-(Mn-M0)×d％)/U2N；
Wherein, d% is span (one grade of every tune, the percent change of no-load voltage ratio), and U1N is the autotransformer 100 side rated voltage that gets access to grid, and U2N is autotransformer 100 water receiving electricity/load side rated voltages.
In concrete operation, by Switch State Combination in Power Systems, the operating state of switchable apparatus:
Bypass condition: K1, K2, K4, K5 disconnect, and K3 is closed.Install not chargedly, can carry out device maintenance, maintenance; Pressure regulation state: K3, K5, K4 disconnect, and K1, K2 are closed; Reactive power compensation state: K3, K4 disconnect, K1, K2, K5 closure.
Preferably, also can comprise the superpotential lightning arrester Z generating for limiting shunt reactor 200, lightning arrester Z is in parallel with shunt reactor 200.Lightning arrester Z can be zinc oxide arrester.
Preferably, described grid side can be equipped with current transformer and voltage transformer.
Preferably, described water power side can be equipped with current transformer and voltage transformer.
Preferably, the unit of described water power side can be by the described grid side of T access way access 10kV circuit.
For the first computing unit 1020, described active power is preferably three phases active power, and described reactive power is preferably three phases active power.
For the first judging unit 1030, described input threshold value is predefined for determining whether the logical criterion of shunt reactor 200 and water power side joint.
In one embodiment, also comprise second unit of transferring the files, while not surpassing described input threshold value for the reactive power in described grid side, according to reactive power and the active power of described grid side and described water power side, obtain active power and the reactive power of autotransformer 100, according to current gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and autotransformer 100, calculate and adjust gear, and according to the adjustment gear calculating, adjust the gear of autotransformer 100.
For reactive power compensation unit 1040, can shunt reactor 200 be accessed to water power sides by Closing Switch K2 and K5.
For second acquisition unit 1050, described preset period of time was preferably the time delay period, as 30 seconds.
For the second computing unit 1060, the method for calculating active power and reactive power is preferably identical with step 102.
For the second judging unit 1070, the capacity of shunt reactor 200 is preferably can be according to the concrete condition configuration of the circuit containing online water power.
Further, can, according to criterion :-0.15< (1-grid side reactive power reduction/reactive compensation capacity) <0.15, judge that whether the reactive power of described grid side is suitable with the capacity of shunt reactor 200.
In one embodiment, after whether suitable with the capacity of shunt reactor 200 step of the reactive power of the described grid side again calculating in described judgement, further comprising the steps of:
If it is not suitable, circulate in after preset period of time, obtain respectively the voltage and current of described grid side and described water power side, and according to the voltage and current obtaining, calculate respectively reactive power and the active power of described grid side and described water power side, until the capacity of the reactive power of the described grid side calculating and shunt reactor 200 is suitable.
For the 3rd judging unit 1080, described control interval is preferably 10.0kV-10.7kV.
In one embodiment, whether after the step in control interval, further comprising the steps of at the described voltage that judges described water power side:
If, the idle control operation of final voltage.
For the unit 1100 of transferring the files, the voltage threshold of described water power side is preferably 10.0kV-10.7kV.
In one embodiment, also comprise the 4th judging unit, for after adjusting the gear of autotransformer 200 according to the adjustment gear calculating:
After the second preset period of time, obtain the voltage of described water power side, and the voltage that judges described water power side is whether in control interval;
If, the idle control operation of final voltage.
Preferably, described the second preset period of time is how long time delay 30 seconds of time delay.
In another embodiment, the unit 1100 of transferring the files can be used for:
By the voltage of the voltage threshold of described water power side, described grid side and autotransformer 100 center gear, short-circuit resistance, short-circuit reactance, active power and reactive power substitution the following stated formula, calculate and adjust gear:
Wherein, M
zfor adjusting gear, P is active power, and Q is reactive power, U
t_UPfor the voltage threshold of described water power side, R is short-circuit resistance, and X is short-circuit reactance, and d% is span, M
0for described center gear, U
1voltage for described grid side.
Preferably, described center gear is that no-load voltage ratio is the gear of 1:1, the gear of described adjustment gear for adjusting to.According to the current gear of described adjustment gear and autotransformer 100, can calculate the gear number that needs to adjust (raise or lower).
The following stated is voltage powerless control system the second execution mode that the present invention is based on voltage and reactive power control system.
The voltage powerless control system based on voltage and reactive power control system described in present embodiment and the difference of the first execution mode are: the unit 1100 of transferring the files also can be used for:
Whether the voltage that judges described water power side is higher than the voltage threshold of described water power side.
If higher than, according to the voltage of the voltage threshold of described water power side, described grid side and autotransformer 100 center gear, short-circuit resistance, short-circuit reactance, active power and reactive power, calculate and adjust gear, and according to the adjustment gear calculating, lower the gear of autotransformer 100.
If not higher than, according to the voltage of the voltage threshold of described water power side, described grid side and autotransformer 100 center gear, short-circuit resistance, short-circuit reactance, active power and reactive power, calculate and adjust gear, and according to the adjustment gear calculating, raise the gear of autotransformer 100.
The voltage powerless control system based on voltage and reactive power control system described in present embodiment, can determine the gear direction that needs adjustment fast, the convenient gear of adjusting.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the voltage powerless control method based on voltage and reactive power control system, it is characterized in that, voltage and reactive power control system comprises for the voltage of water power side being had to the autotransformer that carry to regulate and for grid side being carried out to the shunt reactor of reactive power compensation, the primary coil of described autotransformer is used for connecing described grid side, secondary coil is used for connecing described water power side, described shunt reactor is used for connecing described water power side, and wherein, voltage powerless control method comprises the following steps:
Obtain respectively the voltage and current of described grid side and described water power side;
According to the voltage and current obtaining, calculate respectively reactive power and the active power of described grid side and described water power side;
Whether the reactive power that judges described grid side surpasses input threshold value;
If surpass, by described shunt reactor access water power side, and by described shunt reactor, grid side is carried out to reactive power compensation;
After preset period of time, again obtain respectively the voltage and current of described grid side and described water power side;
According to the voltage and current again obtaining, again calculate respectively reactive power and the active power of described grid side and described water power side;
Whether the reactive power of the described grid side that judgement calculates is again suitable with the capacity of described shunt reactor;
If quite, judge that the voltage of described water power side is whether in control interval;
If do not exist, according to the reactive power and the active power that again calculate, calculate active power and the reactive power of described autotransformer;
According to current gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and described autotransformer, calculate and adjust gear, and according to the adjustment gear calculating, adjust the gear of described autotransformer.
2. whether the voltage powerless control method based on voltage and reactive power control system according to claim 1, is characterized in that, over after dropping into the step of threshold value, further comprising the steps of in the described reactive power that judges described grid side:
If the reactive power of described grid side does not surpass described input threshold value, according to reactive power and the active power of described grid side and described water power side, obtain active power and the reactive power of described autotransformer;
According to current gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and described autotransformer, calculate and adjust gear, and according to the adjustment gear calculating, adjust the gear of described autotransformer.
3. the voltage powerless control method based on voltage and reactive power control system according to claim 1, it is characterized in that, after whether suitable with the capacity of the described shunt reactor step of the reactive power of the described grid side again calculating in described judgement, further comprising the steps of:
If it is not suitable, circulate in after preset period of time, obtain respectively the voltage and current of described grid side and described water power side, and according to the voltage and current obtaining, calculate respectively reactive power and the active power of described grid side and described water power side, until the reactive power of the described grid side calculating is suitable with the capacity of described shunt reactor.
4. whether the voltage powerless control method based on voltage and reactive power control system according to claim 1, is characterized in that, after the step in control interval, further comprising the steps of at the described voltage that judges described water power side:
If, the idle control operation of final voltage.
5. the voltage powerless control method based on voltage and reactive power control system according to claim 1, it is characterized in that, described according to described water power side voltage threshold, the voltage of described grid side and current gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of described autotransformer, calculate to adjust gear, and comprise the following steps according to the step that the adjustment gear calculating is adjusted the gear of described autotransformer:
Whether the voltage that judges described water power side is higher than the voltage threshold of described water power side;
If higher than, according to center gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and described autotransformer, calculate and adjust gear, and according to the adjustment gear calculating, lower the gear of described autotransformer;
If not higher than, according to center gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and described autotransformer, calculate and adjust gear, and according to the adjustment gear calculating, raise the gear of described autotransformer.
6. the voltage powerless control method based on voltage and reactive power control system according to claim 1, described according to center gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and described autotransformer, the step of calculating adjustment gear comprises the following steps:
By the center gear of the voltage of the voltage threshold of described water power side, described grid side and described autotransformer, short-circuit resistance, short-circuit reactance, active power and reactive power substitution the following stated formula, calculate and adjust gear:
Wherein, M
zfor adjusting gear, the active power that P is described autotransformer, the reactive power that Q is described autotransformer, U
t_UPfor the voltage threshold of described water power side, the short-circuit resistance that R is described autotransformer, the short-circuit reactance that X is described autotransformer, the span that d% is described autotransformer, M
0for described center gear, U
1voltage for described grid side.
7. according to the voltage powerless control method based on voltage and reactive power control system described in any one in claim 1 to 6, it is characterized in that, after the adjustment gear calculating in described basis is adjusted the step of gear of described autotransformer, further comprising the steps of:
After the second preset period of time, obtain the voltage of described water power side, and the voltage that judges described water power side is whether in control interval;
If, the idle control operation of final voltage.
8. the voltage powerless control system based on voltage and reactive power control system, it is characterized in that, voltage and reactive power control system comprises for the voltage of water power side being had to the autotransformer that carry to regulate and for grid side being carried out to the shunt reactor of reactive power compensation, the primary coil of described autotransformer is used for connecing described grid side, secondary coil is used for connecing described water power side, described shunt reactor is used for connecing described water power side, and wherein, voltage powerless control system comprises:
The first acquiring unit, for obtaining respectively the voltage and current of described grid side and described water power side;
The first computing unit, for according to the voltage and current obtaining, calculates respectively reactive power and the active power of described grid side and described water power side;
The first judging unit, drops into threshold value for judging whether the reactive power of described grid side surpasses;
Reactive power compensation unit, while surpassing input threshold value for the reactive power in described grid side, by described shunt reactor access water power side, and carries out reactive power compensation by described shunt reactor to grid side;
Second acquisition unit, for after preset period of time, obtains respectively the voltage and current of described grid side and described water power side again;
The second computing unit, for according to the voltage and current again obtaining, calculates respectively reactive power and the active power of described grid side and described water power side again;
Whether the second judging unit is suitable with the capacity of described shunt reactor for judging the reactive power of the described grid side again calculating;
The 3rd judging unit, when suitable with the capacity of described shunt reactor for the reactive power of the described grid side again calculating, judges that the voltage of described water power side is whether in control interval;
The 3rd computing unit, not in control interval time, according to the reactive power again calculating and active power, calculates active power and the reactive power of described autotransformer for the voltage in described water power side;
The unit of transferring the files, be used for according to current gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and described autotransformer, calculate and adjust gear, and according to the adjustment gear calculating, adjust the gear of described autotransformer.
9. the voltage powerless control system based on voltage and reactive power control system according to claim 8, is characterized in that, described in transfer the files unit also for:
Whether the voltage that judges described water power side is higher than the voltage threshold of described water power side;
If higher than, according to center gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and described autotransformer, calculate and adjust gear, and according to the adjustment gear calculating, lower the gear of described autotransformer;
If not higher than, according to center gear, short-circuit resistance, short-circuit reactance, active power and the reactive power of the voltage of the voltage threshold of described water power side, described grid side and described autotransformer, calculate and adjust gear, and according to the adjustment gear calculating, raise the gear of described autotransformer.
10. the voltage powerless control system based on voltage and reactive power control system according to claim 8 or claim 9, described in transfer the files unit also for:
By the center gear of the voltage of the voltage threshold of described water power side, described grid side and described autotransformer, short-circuit resistance, short-circuit reactance, active power and reactive power substitution the following stated formula, calculate and adjust gear:
Wherein, M
zfor adjusting gear, the active power that P is described autotransformer, the reactive power that Q is described autotransformer, U
t_UPfor the voltage threshold of described water power side, the short-circuit resistance that R is described autotransformer, the short-circuit reactance that X is described autotransformer, the span that d% is described autotransformer, M
0for described center gear, U
1voltage for described grid side.
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