CN111799812B - Reactive voltage sensitivity-based reactive coordination control method for offshore wind farm - Google Patents
Reactive voltage sensitivity-based reactive coordination control method for offshore wind farm Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
Abstract
The invention discloses a reactive voltage sensitivity-based reactive coordination control method for an offshore wind farm, which specifically comprises the following steps: detecting the voltage and the power of each node, and judging whether the voltage of the grid-connected point crosses the line or not; distributing reactive power output of the offshore wind turbine and the reactive power compensation device; and (5) distributing reactive power output of each wind turbine generator in the offshore wind farm. The invention can fully utilize the reactive power regulation capability of the wind turbine generator and reduce the installation cost of the reactive power compensation device of the offshore wind farm; the reactive power voltage sensitivity is utilized to distribute reactive power output of a reactive power supply in the offshore wind farm, so that dynamic adjustment capability of the wind turbine generator can be fully utilized, reactive power allowance in the wind farm can be increased on one hand, reactive power output burden of the wind turbine generator can be reduced on the other hand, and the order of reactive power output of the offshore wind turbine generator and a reactive power compensation device can be realized.
Description
Technical Field
The invention belongs to the technical field of offshore wind farms, and particularly relates to a reactive power coordination control method of an offshore wind farm based on reactive voltage sensitivity.
Background
Wind power generation is one of the most mature technologies and the most scale development conditions in new energy power generation. The offshore wind power has the advantages of stable resource conditions, relatively close distance from a load center and the like, and becomes an important direction of the development of the wind power in countries around the world in recent years. On one hand, due to the intermittence, randomness and fluctuation of wind resources, the fluctuation of wind power output can cause corresponding fluctuation of grid-connected point voltage of a large wind power plant. On the other hand, because the charging reactive power of the submarine cable is large, the grid-connected point voltage of the offshore wind farm is easy to exceed the standard. Therefore, for offshore wind farms, effective reactive power control is extremely important to ensure grid-connected point voltage and stability of the whole farm.
For the offshore wind farm, the reactive power device is high in installation cost and difficulty, and coordination control between the offshore wind farm wind turbine and reactive power configuration is lacking, so that the reactive power regulation capability of the wind turbine is not fully utilized. The doubly-fed asynchronous wind power generator set which operates at variable speed and constant frequency is commonly adopted in the offshore wind farm, and active and reactive decoupling control can be achieved, so that the wind power generator set and the reactive compensation device are coordinated and controlled, the reactive adjustment capability of the wind power generator set can be fully utilized, and the installation cost of the reactive compensation device of the offshore wind farm can be reduced. For the coordinated control of the wind turbines and the reactive compensation device, the reactive distribution of each wind turbine is performed by means of equal proportion distribution control and the like in related documents, but the spatial characteristic difference of each wind turbine and the reactive corresponding characteristic of the system are not fully considered.
Disclosure of Invention
Aiming at the reactive voltage control problem of the offshore wind farm, the coordination and the order of the reactive power output of the offshore wind turbine generator and the reactive power compensation device are realized, and the reactive power output of the offshore wind farm is reduced. The invention provides a reactive power coordination control method for an offshore wind farm based on reactive voltage sensitivity.
The invention discloses a reactive voltage sensitivity-based reactive power coordination control method for an offshore wind farm, which comprises the following steps of:
step 1: when the grid-connected point voltage U of the offshore wind power plant pcc When fluctuation occurs, the voltage deviation delta U of the grid-connected point is utilized pcc Calculating reactive power shortage Q of grid-connected point ref Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min And a reactive voltage sensitivity matrix S.
Step 2: according to reactive shortage Q of the point of connection ref Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min Reactive power output required by wind turbine generator in distribution fieldQ wind Reactive output Q of reactive compensation device s 。
Step 3: according to the required reactive power output Q of the wind turbine generator system in the field wind Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min And a reactive voltage sensitivity matrix S for distributing reactive power output Q of each wind turbine generator set i 。
Further, the step 1 specifically includes:
firstly, obtaining wind power plant topology and line parameters, and detecting voltage and power of each node. Judging whether the voltage of the grid-connected point crosses the line after the detection is finished, comprising the following steps:
(1) If the judgment result is yes, calculating the reactive power shortage Q of the grid-connected point ref Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min And a reactive voltage sensitivity matrix S. Wherein reactive shortage Q of the point of connection ref The deficiency value can be obtained by PI regulation, and the reactive output limit of each wind turbine generator can be calculated by using the equivalent circuit of the doubly-fed induction generator to obtain the reactive output range:
aiming at the current limit of the rotor, the reactive output limit of the wind turbine generator is Q sR ：
X s ＝X σs +X M (2)
U in s ，I Rmax The stator side voltage and the rotor side limit current are respectively. X is X σs ，X M The leakage reactance and the excitation reactance of the stator are respectively. P (P) s The output power of the wind turbine generator is obtained.
Aiming at the stator current limit, the reactive output limit of the wind turbine generator is Q ss ：
In which I smax Is a rotor side poleAnd (5) limiting current.
The reactive power limit of the stator side of the generator set is Q as obtained by 1 and 2 S ：
The reactive voltage sensitivity is calculated as follows:
in the load flow calculation, the node voltage is expressed in a polar coordinate manner, and the system node power correction equation can be expressed as follows:
wherein DeltaP and DeltaQ are respectively an active power micro-increment vector and a reactive power micro-increment vector; delta theta and delta V are node voltage phase angle micro-increment and voltage amplitude micro-increment respectively; j is the Jacobian matrix in the flow calculation. In a high-voltage power system, active power is mainly related to the angle of each node voltage, reactive power is related to the amplitude of each node voltage, and parameters in J are simplified by adopting the idea of a P-Q power flow decomposition method, so that the method comprises the following steps:
△Q＝J QV △V/V (6)
wherein J QV The formula is as follows:
the simultaneous expansion of the above formulas is obtained:
the voltage sensitivity matrix S is obtained by simplification:
△V＝(B″) -1 (V) -1 △Q＝S△Q (9)
wherein the B' matrix element is calculated as follows:
wherein x is ij B is the reactance of branch ij i0 The ground stub susceptance for node i.
(2) If the judgment result is NO, the next detection is carried out.
Further, the step 2 specifically includes:
reactive power shortage Q of grid-connected points of wind power plant obtained according to step 1 ref Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min Reactive power output Q required by wind turbine generator in distribution field wind Reactive output Q of reactive compensation device s . The method for preferentially adjusting the reactive power output of the offshore wind turbine generator set and judging whether the reactive power shortage of the grid-connected point is larger than the reactive power output limit of the offshore wind turbine generator set comprises the following steps:
(1) If the determination result is "Yes", Q ref >Q wind_max Or Q ref <Q wind_min Then the required reactive power output Q of the wind turbine generator in the field is maintained wind Is Q wind_max Or Q wind_min And according to the reactive power shortage of the grid-connected point and the reactive power output limit of the offshore wind power, the reactive power required to be compensated by the reactive power compensation device can be obtained as follows:
(2) If the determination result is "no", i.e. Q wind_min <Q ref <Q wind_max Then the reactive power output required by the wind turbine generator set in the field is kept to be Q ref 。
Further, the step 3 specifically includes:
according to the reactive power output Q required by the wind turbine generator in the field obtained in the step 1 wind Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min And a reactive voltage sensitivity matrix S for distributing reactive power output Q of each wind turbine generator set i . Wind power generation at seaThe reactive power output of the unit is sequentially ordered on voltage reactive voltage sensitivity of grid-connected points, nodes s1 (wind turbine units) with maximum sensitivity are preferentially adjusted, and reactive power output Q required by wind turbine units in a field is judged wind Whether the reactive power output limit Q of the s1 wind turbine generator is larger than or not s1_max And Q is equal to s1_min Comprising:
(1) If the determination result is "Yes", Q wind >Q s1_max Or Q wind <Q s1_min Then the reactive output of the s1 node is kept as Q s1_max Or Q s1_min Then, continuously selecting the next node s2 according to the sensitivity sequence, and continuously judging until the node sk is selected to ensure that reactive power output Q required by the wind turbine generator in the field is required wind After distribution is finished, the reactive outputs of all nodes are as follows:
wherein n is the number of groups of wind turbines in the offshore wind farm.
(2) If the determination result is "no", i.e. Q s1_min <Q wind <Q s1_max Then the reactive output of the s1 node is kept as Q wind The other node reactive output remains at 0.
After the judgment is finished and corresponding control is carried out, the step 1 is skipped to continuously detect the voltage and the power of each node.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the reactive power output coordination distribution of the offshore wind turbine and the reactive power compensation device is realized by utilizing the reactive voltage sensitivity, so that the reactive power regulation capability of the offshore wind turbine can be fully utilized, and compared with a coordination control method which does not fully utilize the reactive power of the wind turbine, the method enables the reactive power compensation capacity of the offshore wind turbine to be properly reduced, thereby indirectly reducing the installation cost of the reactive power compensation device of the offshore wind turbine.
2. According to the invention, reactive power output of a reactive power supply in the offshore wind farm is realized by utilizing reactive voltage sensitivity, so that the wind turbine with better regulation capability can be fully utilized, thereby increasing reactive margin in the wind farm, reducing reactive power output burden of the wind turbine, and realizing the order of reactive power output of the offshore wind turbine and a reactive power compensation device.
Drawings
FIG. 1 is a flow chart for distributing reactive power in an offshore wind farm;
FIG. 2 is a reactive output range of a wind turbine;
FIG. 3 is a circuit diagram of a specific example;
FIG. 4 is a graph of simulation results of offshore wind farm grid-connected point voltages for two different distribution methods under specific conditions;
FIG. 5 is a diagram of simulation results of reactive power output of the offshore wind turbine under two different distribution methods in a specific case;
FIG. 6 is a diagram of reactive power output simulation results of the offshore wind farm reactive power compensation device with two different distribution methods under specific cases.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific examples.
The invention discloses a reactive voltage sensitivity-based reactive power coordination control method for an offshore wind farm, which is shown in a flow chart in fig. 1, and specifically comprises the following steps:
1. the voltage and power of each node are detected. Judging whether the voltage of the grid-connected point crosses the line.
(1) If the judgment result is yes, calculating the reactive power shortage Q of the grid-connected point ref Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min And a reactive voltage sensitivity matrix S. Wherein reactive shortage Q of the point of connection ref The deficiency value can be obtained by PI regulation, and the reactive output limit of each wind turbine generator can be calculated by using the equivalent circuit of the doubly-fed induction generator to obtain the reactive output range:
aiming at the current limit of the rotor, the reactive output limit of the wind turbine generator is Q sR ：
X s ＝X σs +X M (2)
U in s ，I Rmax The stator side voltage and the rotor side limit current are respectively. X is X σs ，X M Respectively a stator and an excitation reactance. P (P) s The output power of the wind turbine generator is obtained.
Aiming at the stator current limit, the reactive output limit of the wind turbine generator is Q ss ：
In which I smax Is rotor side limit current.
The reactive power limit of the stator side of the generator set is Q S ：
The reactive output range of the wind turbine generator is shown in the shaded part of fig. 2.
Calculating a reactive voltage sensitivity matrix S:
the system node power correction equation can be expressed as:
wherein DeltaP and DeltaQ are respectively an active power micro-increment vector and a reactive power micro-increment vector; delta theta and delta V are node voltage phase angle micro-increment and voltage amplitude micro-increment respectively; j is the Jacobian matrix in the flow calculation. In a high-voltage power system, active power is mainly related to the angle of each node voltage, reactive power is related to the amplitude of each node voltage, and parameters in J are simplified by adopting the idea of a P-Q power flow decomposition method, so that the method comprises the following steps:
△Q＝J QV △V/V (6)
wherein J QV The formula is as follows:
the simultaneous expansion of the above formulas is obtained:
the voltage sensitivity matrix S is obtained by simplification:
△V＝(B″) -1 (V) -1 △Q＝S△Q (9)
wherein the B' matrix element is calculated as follows:
wherein x is ij B is the reactance of branch ij i0 The ground stub susceptance for node i.
(2) If the judgment result is NO, the next detection is carried out.
2. Reactive power output Q required by wind turbine generator in distribution field wind Reactive output Q of reactive compensation device s ：
Reactive absence Q of grid-connected point of wind power plant obtained according to 1 ref Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min Reactive power output Q required by wind turbine generator in distribution field wind Reactive output Q of reactive compensation device s . The method for preferentially adjusting the reactive power output of the offshore wind turbine generator set and judging whether the reactive power shortage of the grid-connected point is larger than the reactive power output limit of the offshore wind turbine generator set comprises the following steps:
(1) If the determination result is "Yes", Q ref >Q wind_max Or Q ref <Q wind_min Then the required reactive power output Q of the wind turbine generator in the field is maintained wind Is Q wind_max Or Q wind_min And according to the reactive power shortage of the grid-connected point and the reactive power output limit of the offshore wind power, the reactive power required to be compensated by the reactive power compensation device can be obtained as follows:
(2) If the determination result is "no", i.e. Q wind_min <Q ref <Q wind_max Then keep the output of the offshore wind farm at Q ref 。
And after the judgment is finished, the next step is carried out.
3. Reactive power output Q for distributing wind turbines in offshore wind farm i ：
The required reactive power output Q of the wind turbine generator in the field obtained according to 1 wind Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min And a reactive voltage sensitivity matrix S for distributing reactive power output Q of each wind turbine generator set i . Sequentially sequencing the reactive power output of the offshore wind turbine generator to the voltage reactive voltage sensitivity of the grid-connected point, preferentially adjusting the node s1 (wind turbine generator) with the maximum sensitivity, and judging the reactive power output Q required by the wind turbine generator in the field wind Whether the reactive power output limit Q of the s1 wind turbine generator is larger than or not s1_max And Q is equal to s1_min Comprising:
(1) If the determination result is "Yes", Q wind >Q s1_max Or Q wind <Q s1_min Then the reactive output of the s1 node is kept as Q s1_max Or Q s1_min Then, continuously selecting the next node s2 according to the sensitivity sequence, and continuously judging until the node sk is selected to ensure that reactive power output Q required by the wind turbine generator in the field is required wind After distribution is finished, the reactive outputs of all nodes are as follows:
wherein n is the number of groups of wind turbines in the offshore wind farm.
(2) If it is determined thatThe result is "No", i.e. Q s1_min <Q wind <Q s1_max Then the reactive output of the s1 node is kept as Q wind The other node reactive output remains at 0.
After the judgment is finished and corresponding control is carried out, the step 1 is skipped to continuously detect the voltage and the power of each node.
Simulation experiment:
setting ten groups of wind turbines in the offshore wind farm in a certain area, wherein parameters of the wind turbines are shown in table 1, and parameters of the submarine cable are shown in table 2.
TABLE 1 wind turbine parameters
Table 2 parameters of submarine cable
The current wind speed is set to be 8m/s, and the wind speed is divided into two groups, one group is converged into a 35/110kV booster station through a longer line, the other group is converged into the 35/110kV booster station through a shorter line, and then the wind speed is sent to an onshore switching station through a 50km submarine cable. A specific circuit connection diagram is shown in fig. 3. And in the offshore wind farm grid-connected point device, the reactive power compensation device is concentrated, the capacity of the reactive power compensation device is between-100 MVar and 100MVar, the voltage of the grid-connected point is set to fluctuate once at 1s and fluctuates once at 3 s. As the number of the offshore wind turbines is small, the voltage of the set grid-connected point fluctuates in a small range.
The results of the experiments are shown in fig. 4, 5 and 6.
As can be seen from fig. 4, both distribution methods can be restored to 1p.u. in a short time when the grid-tie voltage fluctuates. The voltage at the point of connection will be higher than 1p.u. at the beginning due to the influence of the submarine cable. FIG. 5 is a left graph showing a reactive power output curve of a total offshore wind turbine when reactive power voltage sensitivity is utilized to distribute reactive power output of the wind turbine; and the right graph is a reactive output curve of the total offshore wind turbine when the reactive output of the wind turbine is distributed evenly. The total reactive output of the wind turbine generator set in the left graph is about 70kVar smaller than that in the right graph in 1-3s, and the reactive output difference of the two distribution methods is larger when the reactive shortage of the grid connection point is larger in 3-5 s. The method is beneficial to enabling the wind turbine with good regulation capability to be fully utilized, so that reactive margin inside the wind power plant is increased, and burden of the wind turbine is reduced. The blue curve of fig. 6 is a reactive output curve of the reactive compensation device in the case that the wind turbine generator does not adjust reactive, that is, the reactive output is 0; and red is a reactive output curve of the reactive compensation device under coordinated control of the wind turbine generator and the reactive compensation device. It can be seen that the reactive power output of the reactive power compensation device is reduced under the condition that the wind turbine generator system is fully utilized to generate reactive power, so that the reactive power compensation capacity of the offshore wind farm can be properly reduced, and the installation cost of the reactive power compensation device of the offshore wind farm is indirectly reduced.
Claims (1)
1. The reactive power coordination control method for the offshore wind farm based on the reactive power voltage sensitivity is characterized by comprising the following steps of:
step 1: when the grid-connected point voltage U of the offshore wind power plant pcc When fluctuation occurs, the voltage deviation delta U of the grid-connected point is utilized pcc Calculating reactive power shortage Q of grid-connected point ref Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min A reactive voltage sensitivity matrix S;
firstly, obtaining wind power plant topology and line parameters, and detecting voltage and power of each node; judging whether the voltage of the grid-connected point is out of limit after the detection is finished, including:
(1) If the judgment result is yes, calculating the reactive power shortage Q of the grid-connected point ref Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min Reactive voltage sensitivityA degree matrix S;
wherein reactive shortage Q of the point of connection ref And obtaining an absence value by PI regulation, and calculating a reactive output range by using a doubly-fed induction generator set equivalent circuit to obtain reactive output limits of each wind generator set:
aiming at the current limit of the rotor, the reactive output limit of the wind turbine generator is Q sR ：
X s ＝X σs +X M (2)
In U s 、I Rmax Respectively stator side voltage and rotor side limiting current, X σs ，X M Respectively stator leakage reactance and excitation reactance, P s The output power of the wind turbine generator is;
aiming at the stator current limit, the reactive output limit of the wind turbine generator is Q ss ：
In which I smax Is rotor side limit current;
the reactive power limit of the stator side of the generator set is Q as obtained by 1 and 2 S ：
The reactive voltage sensitivity is calculated as follows:
in the load flow calculation, the node voltage is expressed in a polar coordinate mode, and the system node power correction equation is expressed as follows:
wherein DeltaP and DeltaQ are respectively an active power micro-increment vector and a reactive power micro-increment vector; delta theta and delta V are node voltage phase angle micro-increment and voltage amplitude micro-increment respectively; j is a Jacobian matrix in load flow calculation; in a high-voltage power system, the active power is related to the angle of each node voltage, the reactive power is related to the amplitude of each node voltage, and the parameters in J are simplified by adopting the idea of a P-Q power flow decomposition method, so that the method comprises the following steps:
ΔQ＝J QV ΔV/V (6)
wherein J QV The formula is as follows:
the simultaneous expansion of the above formulas is obtained:
the voltage sensitivity matrix S is obtained by simplification:
ΔV＝(B″) -1 (V) -1 ΔQ＝SΔQ (9)
wherein the B' matrix element is calculated as follows:
wherein x is ij B is the reactance of branch ij i0 A ground path susceptance for node i;
(2) If the judgment result is NO, the next detection is carried out;
step 2: according to reactive shortage Q of the point of connection ref Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min Reactive power output Q required by wind turbine generator in distribution field wind Reactive output Q of reactive compensation device s ；
Reactive power shortage Q of grid-connected points of wind power plant obtained according to step 1 ref Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min Reactive power output Q required by wind turbine generator in distribution field wind Reactive output Q of reactive compensation device s The method comprises the steps of carrying out a first treatment on the surface of the The method for preferentially adjusting the reactive power output of the offshore wind turbine generator set and judging whether the reactive power shortage of the grid-connected point is larger than the reactive power output limit of the offshore wind turbine generator set comprises the following steps:
(1) If the determination result is "Yes", Q ref >Q wind_max Or Q ref <Q wind_min Then the required reactive power output Q of the wind turbine generator in the field is maintained wind Is Q wind_max Or Q wind_min And according to the reactive power shortage of the grid-connected point and the reactive power output limit of the offshore wind power, obtaining the reactive power required to be compensated by the reactive power compensation device as follows:
(2) If the determination result is "no", i.e. Q wind_min <Q ref <Q wind_max Then the reactive power output required by the wind turbine generator set in the field is kept to be Q ref ；
Step 3: according to the required reactive power output Q of the wind turbine generator system in the field wind Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min And a reactive voltage sensitivity matrix S for distributing reactive power output Q of each wind turbine generator set i ；
According to the reactive power output Q required by the wind turbine generator in the field obtained in the step 1 wind Reactive power output limit Q of each wind turbine generator system i_max And Q is equal to i_min And a reactive voltage sensitivity matrix S for distributing reactive power output Q of each wind turbine generator set i ；
Sequentially sequencing the reactive power output of the offshore wind turbine generator to the voltage reactive voltage sensitivity of the grid-connected point, preferentially adjusting the node s1 wind turbine generator with the maximum sensitivity, and judging the reactive power output Q required by the wind turbine generator in the field wind Reactive power output pole of wind turbine generator set with node s1 being larger or notLimit Q s1_max And Q is equal to s1_min Comprising:
(1) If the determination result is "Yes", Q wind >Q s1_max Or Q wind <Q s1_min Then the reactive output of node s1 is maintained at Q s1_max Or Q s1_min Then, continuously selecting the next node s2 according to the sensitivity sequence, and continuously judging until the node sk is selected to ensure that reactive power output Q required by the wind turbine generator in the field is required wind After distribution is finished, the reactive outputs of all nodes are as follows:
wherein n is the number of groups of wind turbines in the offshore wind farm;
(2) If the determination result is "no", i.e. Q s1_min <Q wind <Q s1_max Then the reactive output of the s1 node is kept as Q wind The reactive output of other nodes is kept to be 0;
after the judgment is finished and corresponding control is carried out, the step 1 is skipped to continuously detect the voltage and the power of each node.
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| CN107579540A (en) * | 2017-08-18 | 2018-01-12 | 河海大学 | A kind of marine wind electric field resultant fault traversing method grid-connected based on HVAC |
| CN108599259A (en) * | 2018-06-20 | 2018-09-28 | 湘潭大学 | A kind of micro-capacitance sensor active operational decisions method based on sensitivity analysis |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0833206A (en) * | 1994-07-13 | 1996-02-02 | Shigeo Hayashi | Coordinated distribution control method for power system |
| CN107579546A (en) * | 2016-11-10 | 2018-01-12 | 中国能源建设集团广东省电力设计研究院有限公司 | Marine wind electric field optimal reactive power allocation method based on double-fed fan motor unit blower fan topological structure |
| CN107579540A (en) * | 2017-08-18 | 2018-01-12 | 河海大学 | A kind of marine wind electric field resultant fault traversing method grid-connected based on HVAC |
| CN108599259A (en) * | 2018-06-20 | 2018-09-28 | 湘潭大学 | A kind of micro-capacitance sensor active operational decisions method based on sensitivity analysis |
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