CN105098775A - Microgrid voltage stabilization control method and system - Google Patents
Microgrid voltage stabilization control method and system Download PDFInfo
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- CN105098775A CN105098775A CN201510528970.3A CN201510528970A CN105098775A CN 105098775 A CN105098775 A CN 105098775A CN 201510528970 A CN201510528970 A CN 201510528970A CN 105098775 A CN105098775 A CN 105098775A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
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Abstract
The invention relates to a microgrid voltage stability control method and a microgrid voltage stability control system, wherein the method comprises the following steps: acquiring a voltage value on a micro-grid bus in real time by using a controller of a micro-power supply; judging a voltage fluctuation area where the bus voltage falls according to the voltage value and a preset voltage fluctuation area; and acquiring a corresponding voltage stability control scheme according to the voltage fluctuation area, and performing stability control on the bus voltage on the micro-grid according to the voltage stability control scheme. According to the microgrid voltage control method and system, the voltage value of a microgrid bus is collected in real time by using a controller of a microgrid, and the voltage fluctuation area where the bus voltage is located is judged according to the voltage value and the preset voltage fluctuation area; and acquiring a corresponding voltage stability control scheme according to the voltage fluctuation area, and performing coordination control on the micro power supply, the energy storage system and the load to quickly recover the fluctuation voltage, thereby realizing the stable control on the voltage fluctuation of the micro power grid in different ranges.
Description
Technical field
The present invention relates to network stability control technical field, particularly relate to a kind of micro-capacitance sensor Voltage Stability Control method and system.
Background technology
Micro-capacitance sensor is a kind of new network structure, is that one group of micro battery, load, energy-storage system and control device etc. are combined small-sized is transported to electric system.Micro-capacitance sensor is a concept of relatively traditional bulk power grid, refers to the network that multiple distributed power source and related load thereof form according to certain topological structure, and is associated to regular distribution net by static switch.Micro-capacitance sensor, as the tie of power distribution network and distributed power source, makes power distribution network directly in the face of kind difference, substantial amounts, the even intermittent distributed power source of dispersion access, to be the effective way that distributed energy accesses.Micro-capacitance sensor can be operated in grid-connected and isolated island two kinds of patterns: the grid-connect mode be incorporated into the power networks with regular distribution net; Be not connected with outside bulk power grid or disconnect and the connection of bulk power grid and proceed to the island mode of independent operating because of certain reason.
Because micro-capacitance sensor contains polytype micro battery, need during islet operation to carry out cooperation control to distributed power source, energy-storage system and load, maintain micro-capacitance sensor and gain merit and reactive power equilibrium, realize micro-capacitance sensor safe and reliable operation.In prior art, two kinds: first is mainly contained to the control method of micro-capacitance sensor, micro-capacitance sensor voltage control method towards multi-inverter proposes a kind of compensation virtual synchronous generator (VirtualSynchronousGenerator, VSG) intrinsic droop characteristic and line impedance algorithm, not only ensure the quality of voltage on virtual synchronous generator connection bus, and enable each virtual synchronous generator according to the U-Q sagging curve sharing system load or burden without work of setting; Second, a kind of reactive voltage control method and system of micro-capacitance sensor are proposed, according to micro battery reference voltage corresponding idle-the sagging coefficient of voltage corresponding with micro-capacitance sensor rated voltage idle-the sagging coefficient of voltage between error, regulate weight coefficient vector, until described error is zero.
In prior art, mainly for all voltage fluctuation situations, unified control is carried out to the control method of micro-capacitance sensor, because the voltage fluctuation of different range is different to the influence degree of micro-capacitance sensor, this unified control strategy is unfavorable for the stability contorting of micro-capacitance sensor voltage.
Summary of the invention
Based on this, be necessary the technical problem of the stability contorting being unfavorable for micro-capacitance sensor voltage for control strategy unified in prior art, a kind of micro-capacitance sensor Voltage Stability Control method is provided.
A kind of micro-capacitance sensor Voltage Stability Control method, comprises the steps:
According to scope range of the fluctuation of voltage, micro-capacitance sensor is divided into several voltage fluctuation regions, corresponding Voltage Stability Control scheme is set for each voltage fluctuation region;
Utilize the magnitude of voltage on the controller Real-time Collection micro-capacitance sensor bus of micro battery;
According to described magnitude of voltage and default voltage fluctuation region, judge the voltage fluctuation region that busbar voltage drops on;
Obtain corresponding Voltage Stability Control scheme according to described voltage fluctuation region, according to described Voltage Stability Control scheme, stability contorting is carried out to the busbar voltage on micro-capacitance sensor.
A kind of micro-capacitance sensor Voltage Stability Control system, comprising:
Module being set, for micro-capacitance sensor being divided into several voltage fluctuation regions according to scope range of the fluctuation of voltage, corresponding Voltage Stability Control scheme being set for each voltage fluctuation region;
Acquisition module, the magnitude of voltage on the controller Real-time Collection micro-capacitance sensor bus utilizing micro battery;
Judge module, for according to described magnitude of voltage and default voltage fluctuation region, judges the voltage fluctuation region that busbar voltage drops on;
Control module, for obtaining corresponding Voltage Stability Control scheme according to described voltage fluctuation region, according to described Voltage Stability Control scheme, carries out stability contorting to the busbar voltage on micro-capacitance sensor.
Above-mentioned micro-capacitance sensor voltage control method and system, by utilizing the magnitude of voltage on the controller Real-time Collection micro-capacitance sensor bus of micro battery, according to described magnitude of voltage and default voltage fluctuation region, judge the voltage fluctuation region that busbar voltage drops on; Corresponding Voltage Stability Control scheme is obtained according to described voltage fluctuation region, according to described Voltage Stability Control scheme, cooperation control is carried out between micro battery, energy-storage system, load, the fast quick-recovery of the voltage of fluctuation is stablized, achieves the stability contorting to the voltage fluctuation in micro-capacitance sensor different range.
Accompanying drawing explanation
Fig. 1 is the micro-capacitance sensor Voltage Stability Control method flow diagram of one embodiment of the present of invention;
Fig. 2 is the voltage fluctuation Region dividing schematic diagram of one embodiment of the present of invention;
Fig. 3 is the micro-capacitance sensor Voltage Stability Control method flow diagram of an alternative embodiment of the invention;
Fig. 4 is that one embodiment of the present of invention carry out the method flow diagram of stability contorting to the busbar voltage dropping on B district;
Fig. 5 is that one embodiment of the present of invention carry out the method flow diagram of stability contorting to the busbar voltage dropping on C district;
Fig. 6 is the method flow diagram of the micro-capacitance sensor low-voltage load sheding control operation in Fig. 5;
Fig. 7 is the method flow diagram of the micro-capacitance sensor height crush-cutting machine control operation in Fig. 5;
Fig. 8 is that " the load anticlimax 400kW " of one embodiment of the present of invention tests energy-storage units A phase reactive power and 10kV busbar voltage oscillogram;
Fig. 9 is that " the sudden load increase 100kW " of one embodiment of the present of invention tests energy-storage units A phase reactive power and 10kV busbar voltage oscillogram;
Figure 10 is " wind-driven generator exits suddenly " test energy-storage units A phase reactive power and the 10kV busbar voltage oscillogram of one embodiment of the present of invention;
Figure 11 is the structural representation of the micro-capacitance sensor Voltage Stability Control system of one embodiment of the present of invention.
Embodiment
In order to further set forth the technological means that the present invention takes and the effect obtained, below in conjunction with accompanying drawing and preferred embodiment, to technical scheme of the present invention, carry out clear and complete description.
As shown in Figure 1, Fig. 1 is the micro-capacitance sensor Voltage Stability Control method flow diagram of one embodiment of the present of invention, and a kind of micro-capacitance sensor Voltage Stability Control method, comprising:
Step S101: micro-capacitance sensor is divided into several voltage fluctuation regions according to scope range of the fluctuation of voltage, arranges corresponding Voltage Stability Control scheme for each voltage fluctuation region.
Because different scopes range of the fluctuation of voltage is different to the influence degree of micro-capacitance sensor, therefore, in this step, according to scope range of the fluctuation of voltage, micro-capacitance sensor is divided into several voltage fluctuation regions, and corresponding Voltage Stability Control scheme is set for each voltage fluctuation region, thus realize the stability contorting to the voltage of different scopes range of the fluctuation of voltage.
Step S102: utilize the magnitude of voltage on the controller Real-time Collection micro-capacitance sensor bus of micro battery.
In this step, utilize the magnitude of voltage on the controller Real-time Collection micro-capacitance sensor bus of micro battery, for this busbar voltage place of follow-up judgement voltage fluctuation region and take corresponding control program.
Step S103: according to described magnitude of voltage and default voltage fluctuation region, judge the voltage fluctuation region that busbar voltage drops on.
In this step, the magnitude of voltage gathered according to described controller and the voltage fluctuation region of presetting, judge the voltage fluctuation region at busbar voltage place, take corresponding control program for follow-up according to the voltage fluctuation region at busbar voltage place.
Step S104: obtain corresponding Voltage Stability Control scheme according to described voltage fluctuation region, according to described Voltage Stability Control scheme, stability contorting is carried out to the busbar voltage on micro-capacitance sensor.
In this step, because different scopes range of the fluctuation of voltage is different to the influence degree of micro-capacitance sensor, therefore, different control algolithms has been preset to each voltage fluctuation region, corresponding Voltage Stability Control scheme is obtained according to described voltage fluctuation region, according to described Voltage Stability Control scheme, stability contorting is carried out to the busbar voltage on micro-capacitance sensor.
Above-mentioned micro-capacitance sensor voltage control method, by utilizing the magnitude of voltage on the controller Real-time Collection micro-capacitance sensor bus of micro battery, according to described magnitude of voltage and default voltage fluctuation region, judges the voltage fluctuation region that busbar voltage drops on; Corresponding Voltage Stability Control scheme is obtained according to described voltage fluctuation region, according to described Voltage Stability Control scheme, cooperation control is carried out between micro battery, energy-storage system, load, the fast quick-recovery of the voltage of fluctuation is stablized, achieves the stability contorting to the voltage fluctuation in micro-capacitance sensor different range.
As shown in Figure 2, Fig. 2 is the voltage fluctuation Region dividing schematic diagram of one of them embodiment of the present invention, and in the present embodiment, be A district, B district, C district and D district according to scope range of the fluctuation of voltage by the voltage division of micro-capacitance sensor, division methods is as follows:
If described magnitude of voltage fluctuation range is minimum and in quality of power supply claimed range, then judge that described busbar voltage drops on A district; Wherein: the scope range of the fluctuation of voltage in A district is [U
l.max, U
h.min], U
l.max, U
h.minbe respectively the lower limit in A district, higher limit;
If described magnitude of voltage fluctuation range exceeds the scope range of the fluctuation of voltage in A district, then judge that described busbar voltage drops on B district; Wherein: the scope range of the fluctuation of voltage in B district is [U
l.m, U
h.m], U
l.m, U
h.mbe respectively the lower limit of B district voltage, higher limit;
If described magnitude of voltage fluctuation range exceeds the scope range of the fluctuation of voltage in B district, then judge that described busbar voltage drops on C district; Wherein: the scope range of the fluctuation of voltage in C district is [U
l.min, U
h.max], U
l.min, U
h.maxbe respectively the lower limit of C district voltage, higher limit;
If described magnitude of voltage fluctuation range exceeds the scope range of the fluctuation of voltage in C district, then judge that described busbar voltage drops on D district.
By above-mentioned steps, be the voltage fluctuation region that A, B, C and D tetra-is different by the voltage division of micro-capacitance sensor, and judge according to the lower limit of regional and higher limit the voltage fluctuation region that this busbar voltage drops on.
As shown in Figure 3, Fig. 3 is the micro-capacitance sensor Voltage Stability Control method flow diagram of an alternative embodiment of the invention, and a kind of micro-capacitance sensor Voltage Stability Control method, can comprise the steps:
Step S201: utilize the magnitude of voltage on the controller Real-time Collection micro-capacitance sensor bus of micro battery.
Step S202: according to magnitude of voltage and the default voltage fluctuation region of above-mentioned steps S201, judge the voltage fluctuation region that busbar voltage drops on;
In this step, if busbar voltage drops on A district, then system is normally run, and does not do any control treatment.
Step S203: if busbar voltage does not drop on A district, then judge that whether busbar voltage is in B district.
Step S204: if busbar voltage drops on B district, then regulate the reactive power of energy-storage system to export by micro-capacitance sensor central controller according to the reactive power difference Δ Q calculated, busbar voltage returned to A district.
Wherein in an embodiment, following formula can be adopted to determine the value of reactive power difference Δ Q:
ΔQ＝K
u(U-U
N)；
In formula, K
ufor voltage difference coefficient, U is system virtual voltage, U
nfor specified line voltage perunit value 1.00p.u., fiducial value is 220V.
Step S205: if busbar voltage does not drop on B district, then judge whether busbar voltage drops on C district.
Step S206: if busbar voltage drops on C district, then by performing high crush-cutting machine, low-voltage load sheding control operation, return to A district by busbar voltage;
Step S207: if busbar voltage does not drop on C district, then judge that busbar voltage is in D district, system is out of service.
In this step, if busbar voltage is in D district, even if take control measure also cannot guarantee the stability of micro-capacitance sensor, therefore direct system out of service.
Above-mentioned micro-capacitance sensor voltage control method, by utilizing the magnitude of voltage on the controller Real-time Collection micro-capacitance sensor bus of micro battery, according to described magnitude of voltage and default voltage fluctuation region, judges the voltage fluctuation region that busbar voltage drops on; Corresponding Voltage Stability Control scheme is obtained according to described voltage fluctuation region, according to described Voltage Stability Control scheme, cooperation control is carried out between micro battery, energy-storage system, load, the fast quick-recovery of the voltage of fluctuation is stablized, achieves the stability contorting to the voltage fluctuation in micro-capacitance sensor different range.
As shown in Figure 4, Fig. 4 is that an alternative embodiment of the invention carries out the method flow diagram of stability contorting to the busbar voltage dropping on B district, and carrying out stable control method to the busbar voltage dropping on B district can comprise the steps:
Step S301: busbar voltage drops on B district if judge, then start to carry out stability contorting operation to this busbar voltage;
Step S302: judge whether described magnitude of voltage drops on low pressure B district; Wherein, judgment formula is as follows:
U
L.m≤U＜U
L.max；
Wherein, U
l.m, U
l.maxbe the lower limit in low pressure B district, higher limit respectively, U is busbar voltage.
Step S303: if busbar voltage is in low pressure B district, then calculate the value of reactive power difference Δ Q, formula is as follows:
ΔQ＝K
u(U-U
N)；
Wherein, Δ Q is reactive power difference, K
ufor voltage difference coefficient, U is busbar voltage, U
nfor specified line voltage perunit value 1.00p.u., fiducial value is 220V.
Step S304: judge whether described reactive power difference Δ Q is greater than the maximum idle output valve of energy-storage system;
Step S305: if reactive power difference Δ Q is greater than the maximum idle output valve of energy-storage system, then energy-storage system sends reactive power by maximum output valve to system, and Voltage Stability Control terminates;
Step S306: if reactive power difference Δ Q is not more than the maximum idle output valve of energy-storage system, then judge whether reactive power difference Δ Q is greater than the maximum reactive absorption value of energy-storage system;
Step S307: if reactive power difference Δ Q is greater than the maximum reactive absorption value of energy-storage system, then energy-storage system presses obtained the maximum absorption absorption system reactive power;
Step S308: if reactive power difference Δ Q is not more than the maximum reactive absorption value of energy-storage system, then energy-storage system is by Practical Calculation value output reactive power;
Step S309: if busbar voltage is not or not low pressure B district, then judge whether this busbar voltage drops on overvoltage B district; Wherein, judgment formula is as follows:
U
H.min＜U≤U
H.m；
Wherein, U
h.min, U
h.mbe the lower limit in overvoltage B district, higher limit respectively, U is busbar voltage;
If this busbar voltage drops on overvoltage B district, then perform step S303 ~ S308; Otherwise, terminate the operation of this Voltage Stability Control, continue the Voltage Stability Control operation performed next time.By the execution of above-mentioned steps, achieve the stability contorting to the busbar voltage dropping on B district.
As shown in Figure 5, Fig. 5 is that an alternative embodiment of the invention carries out the method flow diagram of stability contorting to the busbar voltage dropping on C district, and carrying out stable control method to the busbar voltage dropping on C district can comprise the steps:
Step S401: if busbar voltage drops on C district, then start to carry out stability contorting operation to this busbar voltage;
Step S402: judge that whether this busbar voltage is in low pressure C district, can adopt following formula to judge:
U
L.min≤U≤U
L.m；
Wherein, U
l.minand U
l.mfor lower limit and the higher limit in low pressure C district, U is busbar voltage;
Step S403: if this busbar voltage is in low pressure C district, then perform low-voltage load sheding control operation;
Step S404: if busbar voltage is not or not low pressure C district, then judge that whether this busbar voltage is in overvoltage C district, can adopt following formula to judge:
U
H.m≤U≤U
H.max；
Wherein, U
h.mand U
h.maxfor lower limit and the higher limit in overvoltage C district, U is busbar voltage;
Step S405: if busbar voltage is in overvoltage C district, then perform the control operation of high crush-cutting machine; Otherwise, terminate current Voltage Stability Control operation, continue the stability contorting operation performed next time; By the execution of above-mentioned steps, complete the stability contorting to the busbar voltage dropping on C district.
As shown in Figure 6, Fig. 6 is the micro-capacitance sensor low-voltage load sheding control method flow chart in Fig. 5, specifically comprises the steps, wherein, and U
i(i=1,2,3,4,5) take turns definite value for corresponding low-voltage load sheding i-th, and Δ T is the operate time of corresponding round off-load;
If busbar voltage drops on low pressure C district, then start to perform low-voltage load sheding control operation;
Judge the 1st take turns off-load after busbar voltage U whether be less than low-voltage load sheding the 1st and take turns definite value U
1if be less than, then time delay Δ T excises the load branch circuit that the 1st takes turns outlet configuration, and starts the 2nd low-voltage load sheding operation taken turns;
Judge the 2nd take turns off-load after busbar voltage U whether be less than low-voltage load sheding the 1st and take turns definite value U
2if be less than, then time delay 2 Δ T excises the load branch circuit that the 2nd takes turns outlet configuration, starts the 3rd low-voltage load sheding operation taken turns, repeats aforesaid operations, until time delay 5 Δ T excises the load branch circuit that the 5th takes turns outlet configuration, terminate current control operation;
If the above-mentioned 1st to take turns ~ the 5th take turns arbitrary take turns low-voltage load sheding after busbar voltage U be greater than corresponding low-voltage load sheding definite value U
i(i=1,2,3,4,5), just directly terminate current low-voltage load sheding control operation.
By aforesaid operations, the busbar voltage dropping on low pressure C district is returned to A district, achieve the stability contorting to the busbar voltage in C district.
It should be noted that, time delay Δ T after the low-voltage load sheding operation that each is taken turns is to eliminate shake; If after the low-voltage load sheding operation that described 5 take turns, the busbar voltage dropping on low pressure C district does not still return to A district, can continue to perform the operation of above-mentioned low-voltage load sheding, until the busbar voltage dropping on low pressure C district returns to A district, guarantee the stability of micro-capacitance sensor voltage.
As shown in Figure 7, Fig. 7 is the method flow diagram that the high crush-cutting machine of micro-capacitance sensor in Fig. 5 controls, wherein, and U
h1for overfrequency off-the-line the 1st takes turns definite value, U
h2for overfrequency off-the-line the 2nd takes turns definite value:
If busbar voltage is in overvoltage C district, then start to perform the control operation of high crush-cutting machine;
Judge the 1st take turns high crush-cutting machine after busbar voltage U whether be greater than overfrequency off-the-line the 1st and take turns definite value U
h1if, U>=U
h1, then time delay Δ T excises diesel generating set or the blower fan group that the 1st takes turns outlet configuration, and performs the 2nd high crush-cutting machine operation taken turns; It should be noted that, only when dropping into sequence and cutting machine pressing plate, machine logic could be cut according to sequence and excise blower fan successively;
Judge the 2nd take turns high crush-cutting machine after busbar voltage U whether be greater than overfrequency off-the-line the 2nd and take turns definite value U
h2if, U>=U
h2, then time delay 2 Δ T excises diesel generating set or the blower fan group that the 2nd takes turns outlet configuration, and terminates this high crush-cutting machine control operation; It should be noted that, only when dropping into sequence and cutting machine pressing plate, machine logic could be cut according to sequence and excise blower fan successively;
If 1st ~ 2 take turns high crush-cutting machine after busbar voltage U be all not more than overfrequency off-the-line 1st ~ 2 and take turns definite value U
h1and U
h2, then this high crush-cutting machine control operation is directly terminated.
By aforesaid operations, the busbar voltage dropping on overvoltage C district is returned to A district, achieves the stability contorting to the busbar voltage in C district.
It should be noted that, time delay Δ T after the high crush-cutting machine operation that each is taken turns is to eliminate shake;
If after the high crush-cutting machine operation that described 2 take turns, the busbar voltage dropping on overvoltage C district does not still return to A district, can continue to perform above-mentioned high crush-cutting machine operation, until the busbar voltage dropping on overvoltage C district returns to A district, guarantee the stability of micro-capacitance sensor voltage.
As an embodiment, adopt the A phase reactive power waveform of failure wave-recording equipment at energy-storage system leading-out terminal record energy-storage units and the voltage waveform of 10kV bus.Setting: K
u=100kVar/kV, U
h.max=1.2p.u., U
h.m=1.15p.u., U
h.min=1.08p.u., U
l.max=0.95p.u., U
l.m=0.85p.u., U
l.min=0.8p.u..As shown in Figure 8 and Figure 9, wind-driven generator exits suddenly the result of test as shown in Figure 10 to the result of micro-grid load mutant test.
As shown in Figure 8, Fig. 8 is that " the load anticlimax 400kW " of one embodiment of the present of invention tests energy-storage units A phase reactive power and 10kV busbar voltage oscillogram;
As shown in Figure 8: as load anticlimax 400kW, 10kV busbar voltage enters voltage B district's upper half and rises to 1.0829p.u., micro-capacitance sensor central controller controls energy-storage units active power of output is negative value, and energy-storage system is in charged state, and system voltage returns to rapidly in A district.
As shown in Figure 9, Fig. 9 is that " the sudden load increase 100kW " of one embodiment of the present of invention tests energy-storage units A phase reactive power and 10kV busbar voltage oscillogram;
As shown in Figure 9: as sudden load increase 100kW, micro-capacitance sensor central controller regulate energy-storage units active power of output be on the occasion of, energy-storage system is in discharge condition, and 10kV busbar voltage fluctuates in allowed band.
As shown in Figure 10, Figure 10 is " wind-driven generator exits suddenly " test energy-storage units A phase reactive power and the 10kV busbar voltage oscillogram of one embodiment of the present of invention;
As shown in Figure 10: when in system, a typhoon power generator is out of service suddenly, 10kV busbar voltage changes in A district, and system is comparatively stable under this disturbance, owing to voltage out-of-limit not detected, the action of micro-capacitance sensor central controller no abnormality seen.
Known by above-described embodiment, utilize micro-capacitance sensor Voltage Stability Control device of the present invention, different Voltage Stability Control schemes can be taked to the busbar voltage dropping on different voltage fluctuation region, cooperation control is carried out between micro battery, energy-storage system, load, the fast quick-recovery of the voltage of fluctuation is stablized, achieve the stability contorting to the voltage fluctuation in micro-capacitance sensor different range, ensure that the stability of micro-capacitance sensor voltage.
As shown in figure 11, Figure 11 is the structural representation of the micro-capacitance sensor Voltage Stability Control system of one embodiment of the present of invention, and a kind of micro-capacitance sensor Voltage Stability Control system, comprising:
Module 101 being set, for micro-capacitance sensor being divided into several voltage fluctuation regions according to scope range of the fluctuation of voltage, corresponding Voltage Stability Control scheme being set for each voltage fluctuation region;
Acquisition module 102, the magnitude of voltage on the controller Real-time Collection micro-capacitance sensor bus utilizing micro battery;
Judge module 103, for according to described magnitude of voltage and default voltage fluctuation region, judges the voltage fluctuation region that busbar voltage drops on;
Control module 104, for obtaining corresponding Voltage Stability Control scheme according to described voltage fluctuation region, according to described Voltage Stability Control scheme, carries out stability contorting to the busbar voltage on micro-capacitance sensor.
Above-mentioned micro-capacitance sensor voltage control system, by utilizing the magnitude of voltage on the controller Real-time Collection micro-capacitance sensor bus of micro battery, according to described magnitude of voltage and default voltage fluctuation region, judges the voltage fluctuation region that busbar voltage drops on; Corresponding Voltage Stability Control scheme is obtained according to described voltage fluctuation region, according to described Voltage Stability Control scheme, cooperation control is carried out between micro battery, energy-storage system, load, the fast quick-recovery of the voltage of fluctuation is stablized, achieves the stability contorting to the voltage fluctuation in micro-capacitance sensor different range.
Wherein in an embodiment, the module 101 that arranges of described micro-capacitance sensor voltage control system may be used for:
If described magnitude of voltage fluctuation range is minimum and in quality of power supply claimed range, then judge that described busbar voltage drops on A district; Wherein: the scope range of the fluctuation of voltage in A district is [U
l.max, U
h.min], U
l.max, U
h.minbe respectively the lower limit in A district, higher limit;
If described magnitude of voltage fluctuation range exceeds the scope range of the fluctuation of voltage in A district, then judge that described busbar voltage drops on B district; Wherein: the scope range of the fluctuation of voltage in B district is [U
l.m, U
h.m], U
l.m, U
h.mbe respectively the lower limit of B district voltage, higher limit;
If described magnitude of voltage fluctuation range exceeds the scope range of the fluctuation of voltage in B district, then judge that described busbar voltage drops on C district; Wherein: the scope range of the fluctuation of voltage in C district is [U
l.min, U
h.max], U
l.min, U
h.maxbe respectively the lower limit of C district voltage, higher limit;
If described magnitude of voltage fluctuation range exceeds the scope range of the fluctuation of voltage in C district, then judge that described busbar voltage drops on D district.
Wherein in an embodiment, the control module 104 of described micro-capacitance sensor voltage control system may be used for:
If busbar voltage drops on B district, then micro-capacitance sensor central controller regulates the reactive power of energy-storage system to export, and realizes micro-capacitance sensor reactive power equilibrium, makes busbar voltage return to A district;
Wherein, reactive power difference Δ Q is determined by following formula:
ΔQ＝K
u(U-U
N)；
In formula, K
ufor voltage difference coefficient, U is system virtual voltage, U
nfor specified line voltage perunit value 1.00p.u., fiducial value is 220V.
Wherein in an embodiment, the control module 104 of described micro-capacitance sensor Voltage Stability Control system can also be used for:
If busbar voltage drops on C district, then by taking crush-cutting machine, low-voltage load sheding measure, busbar voltage is made to return to A district.
Above-mentioned micro-capacitance sensor voltage control method and system, by utilizing the magnitude of voltage on the controller Real-time Collection micro-capacitance sensor bus of micro battery, according to described magnitude of voltage and default voltage fluctuation region, judge the voltage fluctuation region that busbar voltage drops on; Corresponding Voltage Stability Control scheme is obtained according to described voltage fluctuation region, according to described Voltage Stability Control scheme, cooperation control is carried out between micro battery, energy-storage system, load, the fast quick-recovery of the voltage of fluctuation is stablized, achieves the stability contorting to the voltage fluctuation in micro-capacitance sensor different range.
Micro-capacitance sensor Voltage Stability Control system of the present invention and Voltage Stability Control method one_to_one corresponding of the present invention, the technical characteristic of setting forth in the embodiment of above-mentioned Voltage Stability Control method and beneficial effect thereof are all applicable in the embodiment of Voltage Stability Control system, and this is no longer going to repeat them.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.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. a micro-capacitance sensor Voltage Stability Control method, is characterized in that, comprises the steps:
According to scope range of the fluctuation of voltage, micro-capacitance sensor is divided into several voltage fluctuation regions, corresponding Voltage Stability Control scheme is set for each voltage fluctuation region;
Utilize the magnitude of voltage on the controller Real-time Collection micro-capacitance sensor bus of micro battery;
According to described magnitude of voltage and default voltage fluctuation region, judge the voltage fluctuation region that busbar voltage drops on;
Obtain corresponding Voltage Stability Control scheme according to described voltage fluctuation region, according to described Voltage Stability Control scheme, stability contorting is carried out to the busbar voltage on micro-capacitance sensor.
2. micro-capacitance sensor Voltage Stability Control method according to claim 1, is characterized in that, described step micro-capacitance sensor being divided into several voltage fluctuation regions according to scope range of the fluctuation of voltage comprises:
If described magnitude of voltage fluctuation range is minimum and in quality of power supply claimed range, then judge that described busbar voltage drops on A district; Wherein: the scope range of the fluctuation of voltage in A district is [U
l.max, U
h.min], U
l.max, U
h.minbe respectively the lower limit in A district, higher limit;
If described magnitude of voltage fluctuation range exceeds the scope range of the fluctuation of voltage in A district, then judge that described busbar voltage drops on B district; Wherein: the scope range of the fluctuation of voltage in B district is [U
l.m, U
h.m], U
l.m, U
h.mbe respectively the lower limit of B district voltage, higher limit;
If described magnitude of voltage fluctuation range exceeds the scope range of the fluctuation of voltage in B district, then judge that described busbar voltage drops on C district; Wherein: the scope range of the fluctuation of voltage in C district is [U
l.min, U
h.max], U
l.min, U
h.maxbe respectively the lower limit of C district voltage, higher limit;
If described magnitude of voltage fluctuation range exceeds the scope range of the fluctuation of voltage in C district, then judge that described busbar voltage drops on D district.
3. micro-capacitance sensor Voltage Stability Control method according to claim 2, is characterized in that:
If busbar voltage does not drop on A district, then judge whether busbar voltage drops on B district;
If busbar voltage drops on B district, then regulate the reactive power of energy-storage system to export by micro-capacitance sensor central controller according to the reactive power difference Δ Q calculated, busbar voltage is returned to A district.
4. micro-capacitance sensor Voltage Stability Control method according to claim 3, is characterized in that, described reactive power difference Δ Q is determined by following formula:
ΔQ＝K
u(U-U
N)；
In formula, K
ufor voltage difference coefficient, U is system virtual voltage, U
nfor specified line voltage perunit value 1.00p.u., fiducial value is 220V.
5. micro-capacitance sensor Voltage Stability Control method according to claim 2, is characterized in that:
If busbar voltage does not drop on B district, then judge whether busbar voltage drops on C district;
If busbar voltage drops on C district, then perform high crush-cutting machine, low-voltage load sheding control operation, busbar voltage is returned to A district;
If busbar voltage does not drop on C district, then judge that this busbar voltage drops on D district.
6. a micro-capacitance sensor Voltage Stability Control system, is characterized in that, comprising:
Module being set, for micro-capacitance sensor being divided into several voltage fluctuation regions according to scope range of the fluctuation of voltage, corresponding Voltage Stability Control scheme being set for each voltage fluctuation region;
Acquisition module, the magnitude of voltage on the controller Real-time Collection micro-capacitance sensor bus utilizing micro battery;
Judge module, for according to described magnitude of voltage and default voltage fluctuation region, judges the voltage fluctuation region that busbar voltage drops on;
Control module, for obtaining corresponding Voltage Stability Control scheme according to described voltage fluctuation region, according to described Voltage Stability Control scheme, carries out stability contorting to the busbar voltage on micro-capacitance sensor.
7. micro-capacitance sensor Voltage Stability Control system according to claim 6, is characterized in that, described arrange module also for:
If described magnitude of voltage fluctuation range is minimum and in quality of power supply claimed range, then judge that described busbar voltage drops on A district; Wherein: the scope range of the fluctuation of voltage in A district is [U
l.max, U
h.min], U
l.max, U
h.minbe respectively the lower limit in A district, higher limit;
If described magnitude of voltage fluctuation range exceeds the scope range of the fluctuation of voltage in A district, then judge that described busbar voltage drops on B district; Wherein: the scope range of the fluctuation of voltage in B district is [U
l.m, U
h.m], U
l.m, U
h.mbe respectively the lower limit of B district voltage, higher limit;
If described magnitude of voltage fluctuation range exceeds the scope range of the fluctuation of voltage in B district, then judge that described busbar voltage drops on C district; Wherein: the scope range of the fluctuation of voltage in C district is [U
l.min, U
h.max], U
l.min, U
h.maxbe respectively the lower limit of C district voltage, higher limit;
If described magnitude of voltage fluctuation range exceeds the scope range of the fluctuation of voltage in C district, then judge that described busbar voltage drops on D district.
8. micro-capacitance sensor Voltage Stability Control system according to claim 7, described control module also for:
If busbar voltage does not drop on A district, then judge whether busbar voltage drops on B district;
If busbar voltage drops on B district, then regulate the reactive power of energy-storage system to export by micro-capacitance sensor central controller according to the reactive power difference Δ Q calculated, busbar voltage is returned to A district.
9. micro-capacitance sensor Voltage Stability Control system according to claim 8, is characterized in that, described control module is also for calculating described reactive power difference Δ Q:
ΔQ＝K
u(U-U
N)；
Wherein, K
ufor voltage difference coefficient, U is system virtual voltage, U
nfor specified line voltage perunit value 1.00p.u., fiducial value is 220V.
10. micro-capacitance sensor Voltage Stability Control system according to claim 8, is characterized in that, described control module also for:
If busbar voltage does not drop on B district, then judge whether busbar voltage drops on C district;
If busbar voltage drops on C district, then by performing high crush-cutting machine, low-voltage load sheding control operation, busbar voltage is returned to A district.
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