CN102354986B - Dynamic reactive joint compensation system and method of regional wind power stations - Google Patents
Dynamic reactive joint compensation system and method of regional wind power stations Download PDFInfo
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- CN102354986B CN102354986B CN 201110319596 CN201110319596A CN102354986B CN 102354986 B CN102354986 B CN 102354986B CN 201110319596 CN201110319596 CN 201110319596 CN 201110319596 A CN201110319596 A CN 201110319596A CN 102354986 B CN102354986 B CN 102354986B
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Abstract
The invention discloses a dynamic reactive joint compensation system and method of regional wind power stations. Each wind power station in a region is communicated with a dynamic reactive joint compensation system of the regional wind power stations; the POI (point of interconnection) voltage of each wind power station is monitored, and generating points of grid voltage sag or rise are judged; according to the POI voltage of each wind power station, a reactive power compensation instruction value of each wind power station is calculated; each wind power station in the region executes the reactive power compensation instruction values of the dynamic reactive joint compensation system, and the grid voltage is adjusted; and the above steps are carried out repeatedly until the grid voltage operates stably. By adopting the technical scheme, the reactive compensation amount of each wind power station for the system is calculated in accordance with the different POI voltages, and the reactive joint compensation of the regional wind power stations can be realized.
Description
Technical field
The present invention relates to the wind power technology field, relate in particular to a kind of regional wind energy turbine set dynamic reactive combined compensation system and method.
Background technology
Along with the development of economy and social relationships, the mankind are increasing to the demand of the energy.Utilize wind power generation can reduce the dependence of the conventional energy resources such as coal, oil, thus environmental contamination reduction, to improving energy resource structure and realizing that low carbon development is significant.So wind power generation constantly develops in recent years, its proportion in electric power system is also increasing.
But, because wind energy is random and uncontrollable, the electric energy that the wind-powered electricity generation unit sends is fluctuation and random, must cause voltage fluctuation and the flickering of wind-powered electricity generation unit.By the randomness of wind, the output load of wind energy turbine set is that a variation is loaded frequently, to metastable electric power system, is an interference source, can produce shock effect and power quality problem to electric power system after wind farm grid-connected.In addition, the voltage wide fluctuations problem in the zone that wind-powered electricity generation is concentrated is very outstanding, to system voltage, regulates and brings larger pressure.May not cause a large amount of wind-powered electricity generation unit off-grids if wind turbine generator does not possess low voltage ride-through function when electrical network is sent out fault, the operation that electric power system tide is changed on electrical network causes serious impact.
Although each wind energy turbine set has configured the reactive power compensation device of certain capacity, the randomness of wind energy turbine set and fluctuation can be by the reactive power compensator quick adjustment, but wind-powered electricity generation proportion in network system is larger, also just higher for reactive capability and the control requirement of wind energy turbine set.It is 1 that current wind energy turbine set voltage control still has most of employing booster stations outlet power factor, with system, does not carry out reactive power exchange for the control principle.There is very large problem in this, can not guarantee that wind energy turbine set booster stations voltage is in rational scope, thereby reduce Network Voltage Stability nargin.Therefore need to change control strategy, require wind energy turbine set to carry out the idle speed governing of exerting oneself according to the busbar voltage of boosting, send idlely when system voltage is low to system, when system voltage is high, absorb idle from system.
Many for these reasons wind energy turbine set start to put forth effort to develop the Reactive Compensation in Wind Farm function, but wind energy turbine set just accesses a point of electrical network for electrical network, and whole system is interconnective, only have whole wind-powered electricity generation regional power system voltage is carried out to idle hybrid compensation, could maintain better Network Voltage Stability.So it is very significant setting up a whole set of regional wind energy turbine set dynamic reactive combined compensation system.
Summary of the invention
The object of the invention is to propose a kind of regional wind energy turbine set dynamic reactive combined compensation system and method, can calculate each wind energy turbine set according to the grid-connected node voltage of difference and system be carried out to the amount of reactive power compensation, the idle hybrid compensation of feasible region wind energy turbine set.
For reaching this purpose, the present invention by the following technical solutions:
A kind of regional wind energy turbine set dynamic reactive combined compensation system, comprise wind farm grid-connected dotted state read module, wind energy turbine set state read module, the idle allocation strategy module of wind energy turbine set is idle command calculations module and wind energy turbine set, wind farm grid-connected dotted state read module is connected with each wind energy turbine set respectively with wind energy turbine set state read module, wind farm grid-connected dotted state read module is connected with the idle command calculations module of wind energy turbine set respectively with wind energy turbine set state read module, command calculations module that wind energy turbine set is idle is connected with the idle allocation strategy module of wind energy turbine set, allocation strategy module that wind energy turbine set is idle is connected with each wind energy turbine set,
Wherein, wind farm grid-connected dotted state read module is for reading the magnitude of voltage of each wind farm grid-connected point;
Wind energy turbine set state read module is for reading the state information of each wind energy turbine set;
Command calculations module that wind energy turbine set is idle is for calculating the reactive power compensation command value;
Allocation strategy module that wind energy turbine set is idle is for distributing to the reactive power compensation command value each wind energy turbine set in zone.
A kind of regional wind energy turbine set dynamic reactive hybrid compensation method comprises the following steps:
Each wind energy turbine set and regional wind energy turbine set dynamic reactive combined compensation system in A, zone establish a communications link;
B, the grid-connected point voltage of each wind energy turbine set is monitored, the judgement line voltage falls or the rising origination point;
C, according to the grid-connected point voltage of each wind energy turbine set, calculate each wind energy turbine set reactive power compensation command value;
In D, zone, each wind energy turbine set is carried out the reactive power compensation command value of dynamic reactive combined compensation system, and line voltage is regulated;
E, repeating step B are to step D, until the Network Voltage Stability operation.
Judge that line voltage falls or the rising origination point is further comprising the steps:
When a certain point of transmission line occurs that voltage falls situation, different and magnitudes of voltage site of contrast are judged the position of breaking down, the magnitude of voltage minimum and site around;
Obtain the fault origination point by the computing electric power line impedance;
When voltage rising situation appears in a certain point of transmission line, the different also magnitudes of voltage of site of contrast are judged the position that produces voltage rising source, around the also site that magnitude of voltage is the highest;
Obtain voltage rising origination point by the computing electric power line impedance.
Calculate each wind energy turbine set reactive power compensation command value according to the grid-connected point voltage of each wind energy turbine set further comprising the steps:
Calculate the described and required reactive power compensation amount in site according to the grid-connected point voltage of each wind energy turbine set in zone, the application pi regulator carries out each also control of site reactive power compensation amount;
Voltage regulator is exported after idle deviate and wind energy turbine set reactive power set point add and subtract and calculate, compare with the reactive power value of wind farm grid-connected point measurement, by reactive power regulator, calculate each wind energy turbine set reactive power compensation command value of output.
Adopted technical scheme of the present invention, can carry out the dynamic reactive hybrid compensation to the wind energy turbine set in zone, this regional power grid voltage has been carried out to idle unified adjusting the, the operation of feasible region Network Voltage Stability.The advantage of this wind energy turbine set dynamic reactive combined compensation system maximum is to calculate each wind energy turbine set according to the grid-connected node voltage of difference system to be carried out to the amount of reactive power compensation, the idle hybrid compensation of feasible region wind energy turbine set.
The accompanying drawing explanation
Fig. 1 is the structural representation of regional wind energy turbine set dynamic reactive combined compensation system in the specific embodiment of the invention.
Fig. 2 is regional wind energy turbine set dynamic reactive hybrid compensation flow chart in the specific embodiment of the invention.
Fig. 3 is the connection diagram of regional wind energy turbine set dynamic reactive combined compensation system and wind energy turbine set in the specific embodiment of the invention.
Fig. 4 is in the specific embodiment of the invention and the control block diagram of site reactive power compensation amount.
Fig. 5 calculates the control block diagram of each wind energy turbine set reactive power compensation command value of output in the specific embodiment of the invention.
Embodiment
Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing and by embodiment.
Fig. 1 is the structural representation of regional wind energy turbine set dynamic reactive combined compensation system in the specific embodiment of the invention.As shown in Figure 1, command calculations module that this system comprises wind farm grid-connected dotted state read module, wind energy turbine set state read module, wind energy turbine set is idle and the idle allocation strategy module of wind energy turbine set.
Wind farm grid-connected dotted state read module is connected with each wind energy turbine set respectively with wind energy turbine set state read module, wind farm grid-connected dotted state read module is connected with the idle command calculations module of wind energy turbine set respectively with wind energy turbine set state read module, command calculations module that wind energy turbine set is idle is connected with the idle allocation strategy module of wind energy turbine set, and allocation strategy module that wind energy turbine set is idle is connected with each wind energy turbine set.
Wind farm grid-connected dotted state read module reads the magnitude of voltage of each wind farm grid-connected point, wind energy turbine set state read module reads the state information of each wind energy turbine set, command calculations module that wind energy turbine set is idle is calculated the reactive power compensation command value, and allocation strategy module that wind energy turbine set is idle is distributed to each wind energy turbine set in zone by the reactive power compensation command value.
Fig. 2 is regional wind energy turbine set dynamic reactive hybrid compensation flow chart in the specific embodiment of the invention.As shown in Figure 2, this zone wind energy turbine set dynamic reactive hybrid compensation flow process comprises the following steps:
Each wind energy turbine set and regional wind energy turbine set dynamic reactive combined compensation system in step 201, zone establish a communications link.
As shown in Figure 3, each wind energy turbine set (wind energy turbine set 01, wind energy turbine set 02, wind energy turbine set 03 etc.) in the zone is connected on transmission line by each grid-connected node (A, B, C, D, E etc.).Each wind energy turbine set is connected by communication line with regional wind energy turbine set dynamic reactive combined compensation system, completes the exchanges data between wind energy turbine set and combined compensation system.
In zone, each wind farm grid-connected point voltage can be monitored by the wind energy turbine set voltage measuring apparatus, so this signal directly can be referred to the required grid-connected point voltage value of regional wind energy turbine set dynamic reactive combined compensation system.There is impedance transmission line in itself, if each grid-connected point voltage value is different when circuit breaks down.
When a certain point of transmission line occurs that voltage falls situation, by this, raise gradually to other point voltage, so regional wind energy turbine set dynamic reactive combined compensation system just can contrast the magnitudes of voltage of different and site and judge the position of breaking down, that and site of magnitude of voltage minimum around.Can obtain comparatively accurately the fault origination point by the computing electric power line impedance.
When the situation of voltage rising appears in a certain point of transmission line, by this, reduced gradually to other point voltage, so regional wind energy turbine set dynamic reactive combined compensation system just can contrast the magnitudes of voltage of different and site and judge the position that produces voltage rising source, the highest that of magnitude of voltage site around.Can obtain comparatively accurately voltage by the computing electric power line impedance and rise origination point.
Calculate this and put required reactive power compensation amount according to each wind farm grid-connected point voltage in zone, native system application pi regulator carries out the control of each point reactive power compensation amount, as shown in Figure 4, and V wherein
ref plant, V
mea pCCfor wind farm grid-connected some reference voltage, measuring voltage; AVR is wind farm grid-connected point voltage adjuster, Δ Q
voltfor voltage regulator is exported idle deviate.
As shown in Figure 5, voltage regulator is exported to idle deviate Δ Q
voltwith wind energy turbine set reactive power set point Q
setp lantadd and subtract after calculating the reactive power value Q with wind farm grid-connected point measurement
mea pCCcompare, by reactive power regulator AQR, calculate each wind energy turbine set reactive power compensation instruction Q of output
ref plant.
In step 204, zone, each wind energy turbine set is carried out the reactive power compensation command value of dynamic reactive combined compensation system, and line voltage is regulated.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (2)
1. a regional wind energy turbine set dynamic reactive hybrid compensation method, is characterized in that, comprises the following steps:
Each wind energy turbine set and regional wind energy turbine set dynamic reactive combined compensation system in A, zone establish a communications link;
B, the grid-connected point voltage of each wind energy turbine set is monitored, the judgement line voltage falls or the rising origination point;
C, according to the grid-connected point voltage of each wind energy turbine set, calculate each wind energy turbine set reactive power compensation command value;
In D, zone, each wind energy turbine set is carried out the reactive power compensation command value of dynamic reactive combined compensation system, and line voltage is regulated;
E, repeating step B are to step D, until the Network Voltage Stability operation,
Wherein judge that line voltage falls or the rising origination point is further comprising the steps:
When a certain point of transmission line occurs that voltage falls situation, different and magnitudes of voltage site of contrast are judged the position of breaking down, the magnitude of voltage minimum and site around;
Obtain the fault origination point by the computing electric power line impedance;
When voltage rising situation appears in a certain point of transmission line, the different also magnitudes of voltage of site of contrast are judged the position that produces voltage rising source, around the also site that magnitude of voltage is the highest;
Obtain voltage rising origination point by the computing electric power line impedance.
2. a kind of regional wind energy turbine set dynamic reactive hybrid compensation method according to claim 1, is characterized in that, calculates each wind energy turbine set reactive power compensation command value according to the grid-connected point voltage of each wind energy turbine set further comprising the steps:
Calculate the described and required reactive power compensation amount in site according to the grid-connected point voltage of each wind energy turbine set in zone, the application pi regulator carries out each also control of site reactive power compensation amount;
Voltage regulator is exported after idle deviate and wind energy turbine set reactive power set point add and subtract and calculate, compare with the reactive power value of wind farm grid-connected point measurement, by reactive power regulator, calculate each wind energy turbine set reactive power compensation command value of output.
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| CN113746145B (en) * | 2020-05-28 | 2024-05-14 | 北京金风科创风电设备有限公司 | Reactive power control method and reactive power control equipment of wind power plant and controller of wind power plant |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2175540A2 (en) * | 2008-10-09 | 2010-04-14 | General Electric Company | Voltage control at windfarms |
| CN101931241A (en) * | 2010-09-21 | 2010-12-29 | 许继集团有限公司 | Wind farm grid-connected coordination control method |
| CN101938131A (en) * | 2010-09-01 | 2011-01-05 | 国网电力科学研究院 | Electric principle-based wind power plant cluster reactive power sharing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2175540A2 (en) * | 2008-10-09 | 2010-04-14 | General Electric Company | Voltage control at windfarms |
| CN101938131A (en) * | 2010-09-01 | 2011-01-05 | 国网电力科学研究院 | Electric principle-based wind power plant cluster reactive power sharing method |
| CN101931241A (en) * | 2010-09-21 | 2010-12-29 | 许继集团有限公司 | Wind farm grid-connected coordination control method |
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Inventor after: Chu Jingchun Inventor after: Ji Guorui Inventor after: Pan Lei Inventor after: Qin Ming Inventor after: Sun Lixiang Inventor before: Xu Jiayuan Inventor before: Ji Guorui Inventor before: Pan Lei Inventor before: Qin Ming Inventor before: Sun Lixiang |
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