CN111835017A - Reactive voltage coordination control method and device for new energy power station - Google Patents

Reactive voltage coordination control method and device for new energy power station Download PDF

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CN111835017A
CN111835017A CN201910330388.4A CN201910330388A CN111835017A CN 111835017 A CN111835017 A CN 111835017A CN 201910330388 A CN201910330388 A CN 201910330388A CN 111835017 A CN111835017 A CN 111835017A
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power
new energy
reactive power
reactive
generator set
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CN111835017B (en
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钱敏慧
赵大伟
马进
姜达军
吴福保
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
North China Electric Power University
State Grid Shanghai Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
North China Electric Power University
State Grid Shanghai Electric Power Co Ltd
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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
    • 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
    • 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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Abstract

The invention relates to a reactive voltage coordination control method and device for a new energy power station, which comprises the following steps: calculating a reactive power demand value of the new energy power station according to a scheduling instruction output by the power grid scheduling system; determining reactive power output reference values of specific units of the new energy power station according to the reactive power demand values of the new energy power station; and adjusting the reactive power output value of each specific unit of the new energy power station to be the reactive power output reference value. The reactive voltage control method of the new energy power station is realized by dividing the reactive voltage control method of the new energy power station into two levels by adopting a layered control thought, the control function of each level is clear, and the voltage of a grid-connected point can be changed to realize the reactive/voltage closed-loop control of the whole power station; the reactive power control method has the advantages that different reactive power control modes of power grid dispatching can be realized, the control adaptability is strong, the universality is realized, and the control structure is suitable for new energy power stations with different installed capacities and different access levels.

Description

Reactive voltage coordination control method and device for new energy power station
Technical Field
The invention relates to the technical field of new energy power generation operation control, in particular to a reactive voltage comprehensive coordination control method and device for a new energy power station.
Background
With the problems of environmental pollution, the gradual depletion of petrochemical energy, the safety of energy supply and the like, the development and utilization of renewable energy are receiving more and more attention from the international society. Wind power and solar energy are renewable clean energy, and compared with the traditional power generation technology, the wind power generation and the photovoltaic power generation have the advantages of sustainable energy, safety, environmental protection and the like, and are rapidly developed in recent years.
The new energy power generation system is merged into a power grid, when the capacity of the new energy power generation system is smaller than that of the power grid, the influence of the disturbance of the power on the safety and stability of the power grid can be ignored, the influence on the power grid is gradually shown along with the continuous increase of the permeability of the power grid for new energy power generation, the new energy power generation can bring safety hazards to the power grid while providing active energy, and the problem is increasingly highlighted along with the continuous improvement of the grid-connected capacity for new energy grid-connected power generation.
The new energy power station participates in the control of the power system, and has the capabilities of adjusting the active/reactive output of a grid-connected point and responding to the voltage and frequency change of a power grid, so that the universal requirement of new energy grid connection of various countries is met. Compared with thermal power units and hydroelectric power units, wind power units and photovoltaic power generation units have the characteristics of small single-machine capacity, low alternating-current side voltage and the like, one wind power plant or photovoltaic power station usually comprises dozens to hundreds of wind power units or photovoltaic inverters, the photovoltaic power station adopting string photovoltaic inverters has the number of thousands of photovoltaic inverters, and the control of electric quantities such as power, voltage, frequency and the like of a grid-connected point must be realized by means of integral coordination control of a power station level. At present, an independent power station level power control system becomes a standard configuration of a wind power plant and a photovoltaic power station, and due to the effect of the power station control system, the grid-connected characteristic of a new energy power station, particularly the characteristic of time scale above second level, is not completely determined by wind/light resources and power generation equipment, and is more closely related to the control performance of the power station control system. Therefore, when researching a new energy power generation grid connection problem with a relatively long time scale, a model of a power station control system is one of important factors which must be considered.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a reactive voltage comprehensive coordination control method and a reactive voltage comprehensive coordination control device for a new energy power station. The reactive power demand setting layer calculates a reactive power demand value required by the whole station by acquiring the output power of a grid-connected point and a real-time voltage value; and the reactive reference calculation layer decomposes the calculated reactive power demand value into each generator set/unit and reactive compensation equipment in the power station according to a formulated control strategy, and the reactive power demand value is used as a control signal to change the reactive power output of the generator set/unit and the reactive compensation device, so that the voltage of a grid-connected point is changed to realize the reactive/voltage closed-loop control of the whole power station.
The purpose of the invention is realized by adopting the following technical scheme:
in one aspect, the invention provides a reactive voltage coordination control method for a new energy power station, and the improvement is that the method comprises the following steps:
calculating a reactive power demand value of the new energy power station according to a scheduling instruction output by the power grid scheduling system;
determining reactive power output reference values of specific units of the new energy power station according to the reactive power demand values of the new energy power station;
and adjusting the reactive power output value of each specific unit of the new energy power station to be the reactive power output reference value.
Preferably, the calculating the reactive power demand value of the new energy power station according to the scheduling instruction output by the power grid scheduling system includes:
when the power grid dispatching system adopts a reactive power control mode, the dispatching instruction output by the power grid dispatching system is a power station grid-connected point reactive power reference value QrefAnd determining the reactive power demand value of the new energy power station according to the following formula:
Qord＝Qref+Qloss
when the power grid dispatching system adopts a power factor control mode, the dispatching instruction output by the power grid dispatching system is a power factor reference value PF of a power station grid-connected pointrefAnd determining the reactive power demand value of the new energy power station according to the following formula:
Figure BDA0002037505440000021
when the power grid dispatching system adopts a fixed voltage system mode, the dispatching instruction output by the power grid dispatching system is the voltage U of the power station grid-connected pointrefAnd then determining the reactive power demand value of the new energy power station according to the following formula:
Figure BDA0002037505440000022
when the power grid dispatching system adopts a reactive/voltage droop control mode, the dispatching instruction output by the power grid dispatching system is the voltage U of the power station grid-connected pointrefAnd then determining the reactive power demand value of the new energy power station according to the following formula:
Qord＝Q0+Qadj+Qloss
in the above formula, QrefA reactive power instruction is issued for scheduling; qlossThe reactive power loss of the new energy power station is achieved; pPOIThe active power measured value of the grid-connected point; qadjAdjusting the reactive power of the new energy power station; qSVCThe reactive power of a reactive power compensation device in the new energy power station is obtained;
Figure BDA0002037505440000023
the total reactive power value is generated by the new energy generator set; n is the number of the units of the new energy power station; q0And the dispatching instruction output by the power grid dispatching system is the corresponding reactive power of the power station grid-connected point voltage.
Further, determining the reactive power adjustment quantity Q of the new energy power station according to the following formulaadj：
Qadj＝kqv×(Uref-UPOI)
In the above formula, UrefThe reactive voltage is issued for dispatching; k is a radical ofqvThe reactive voltage regulation coefficient; u shapePOIIs a voltage measurement of the grid-connected point.
Preferably, the determining the reactive power output reference value of each specific unit of the new energy power station according to the reactive power demand value of the new energy power station includes:
determining a reactive power reference value of the ith new energy generator set according to the following formula:
Figure BDA0002037505440000031
or determining a reactive power reference value of the ith new energy generator set according to the following formula:
Figure BDA0002037505440000032
or when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system, determining the reactive power reference value of the ith new energy generator set according to the following formula:
Qref_i＝Qmeas_i
when the rated output reactive power of the new energy generator set is greater than the measured reactive power issued by the system, determining the reactive power reference value of the ith new energy generator set according to the following formula:
Qref_i＝D′i×Qord
in the above formula, Qref_iDistributing a reactive power reference value to the ith new energy generator set; PF (particle Filter)plantThe power factor of the new energy power station;
Figure BDA0002037505440000033
the maximum reactive capacity of the ith new energy generator set participating in reactive power control is obtained;
Figure BDA0002037505440000034
the sum of the maximum reactive capacity of all new energy generator sets participating in reactive power control; qmeas_jThe measured value of the reactive power of the jth new energy generator set is obtained; d'iAnd distributing the reactive power distribution factor of the ith new energy generator set when the rated output reactive power of the set is greater than the measured reactive power issued by the system.
Further, the power factor PF of the new energy power station is determined according to the following formulaplant:
Figure BDA0002037505440000035
In the above formula, SIGMA Pmeas_iThe active power sum of the new energy generator set.
Further, when the rated output reactive power of the new energy generator set is determined to be larger than the measured reactive power issued by the system according to the following formula, the reactive power distribution factor D 'of the ith new energy generator set'i：
Figure BDA0002037505440000041
Determining a distribution factor D of the output reactive power of the ith new energy generator set when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system according to the following formulai”'：
Di”'＝Qmeas_i/Qord
In the above formula, DiOutputting an initial distribution factor of reactive power for the ith new energy generator set; diAnd outputting an initial distribution factor of the reactive power for the ith new energy generator set when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system.
In another aspect, the invention also provides a new energy power station reactive voltage coordination control device, and the improvement is that the device comprises:
a calculation module: calculating a reactive power demand value of the new energy power station according to a scheduling instruction output by the power grid scheduling system;
a determination module: determining reactive power output reference values of specific units of the new energy power station according to the reactive power demand values of the new energy power station;
an adjusting module: and adjusting the reactive power output value of each specific unit of the new energy power station to be the reactive power output reference value.
Preferably, the calculation module is configured to:
when the power grid dispatching system adopts a reactive power control mode, the dispatching instruction output by the power grid dispatching system is a power station grid-connected point reactive power reference value QrefAnd determining the reactive power demand value of the new energy power station according to the following formula:
Qord＝Qref+Qloss
when the power grid dispatching system adopts a power factor control mode, the dispatching instruction output by the power grid dispatching system is a power factor reference value PF of a power station grid-connected pointrefAnd determining the reactive power demand value of the new energy power station according to the following formula:
Figure BDA0002037505440000042
when the power grid dispatching system adopts a fixed voltage system mode, the dispatching instruction output by the power grid dispatching system is the voltage U of the power station grid-connected pointrefAnd then determining the reactive power demand value of the new energy power station according to the following formula:
Figure BDA0002037505440000051
when the power grid dispatching system adopts a reactive/voltage droop control mode, the dispatching instruction output by the power grid dispatching system is the voltage U of the power station grid-connected pointrefAnd then determining the reactive power demand value of the new energy power station according to the following formula:
Qord＝Q0+Qadj+Qloss
in the above formula, QrefA reactive power instruction is issued for scheduling; qlossThe reactive power loss of the new energy power station is achieved; pPOIThe active power measured value of the grid-connected point; qadjAdjusting the reactive power of the new energy power station; qSVCThe reactive power of a reactive power compensation device in the new energy power station is obtained;
Figure BDA0002037505440000052
the total reactive power value is generated by the new energy generator set; n is the number of the units of the new energy power station; q0And the dispatching instruction output by the power grid dispatching system is the corresponding reactive power of the power station grid-connected point voltage.
Further, determining the reactive power adjustment quantity Q of the new energy power station according to the following formulaadj：
Qadj＝kqv×(Uref-UPOI)
In the above formula, UrefThe reactive voltage is issued for dispatching; k is a radical ofqvThe reactive voltage regulation coefficient; u shapePOIIs a voltage measurement of the grid-connected point.
Preferably, the determining module is configured to:
determining a reactive power reference value of the ith new energy generator set according to the following formula:
Figure BDA0002037505440000053
or determining a reactive power reference value of the ith new energy generator set according to the following formula:
Figure BDA0002037505440000054
or when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system, determining the reactive power reference value of the ith new energy generator set according to the following formula:
Qref_i＝Qmeas_i
when the rated output reactive power of the new energy generator set is greater than the measured reactive power issued by the system, determining the reactive power reference value of the ith new energy generator set according to the following formula:
Qref_i＝D′i×Qord
in the above formula, Qref_iDistributing a reactive power reference value to the ith new energy generator set; PF (particle Filter)plantThe power factor of the new energy power station; qi maxThe maximum reactive capacity of the ith new energy generator set participating in reactive power control is obtained;
Figure BDA0002037505440000061
the sum of the maximum reactive capacity of all new energy generator sets participating in reactive power control; qmeas_jThe measured value of the reactive power of the jth new energy generator set is obtained; d'iAnd distributing the reactive power distribution factor of the ith new energy generator set when the rated output reactive power of the set is greater than the measured reactive power issued by the system.
Further, the power factor PF of the new energy power station is determined according to the following formulaplant:
Figure BDA0002037505440000062
In the above formula, SIGMA Pmeas_iThe active power sum of the new energy generator set.
Further, when the rated output reactive power of the new energy generator set is determined to be larger than the measured reactive power issued by the system according to the following formula, the reactive power distribution factor D 'of the ith new energy generator set'i：
Figure BDA0002037505440000063
Determining a distribution factor D of the output reactive power of the ith new energy generator set when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system according to the following formulai”'：
Di”'＝Qmeas_i/Qord
In the above formula, DiOutputting an initial distribution factor of reactive power for the ith new energy generator set; diAnd outputting an initial distribution factor of the reactive power for the ith new energy generator set when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system.
Compared with the closest prior art, the invention has the following beneficial effects:
1. according to the method, the reactive power demand value of the new energy power station is calculated according to a dispatching instruction output by a power grid dispatching system, then the reactive power output reference value of each specific unit of the new energy power station is determined according to the reactive power demand value of the new energy power station, finally the reactive power output value of each specific unit of the new energy power station is adjusted to be the reactive power output reference value, a layered control thought is adopted, the reactive voltage control method of the new energy power station is divided into two levels to be realized, and the control function of each level is clear;
2. the coordination control method and the device can change the voltage of the grid-connected point to realize the reactive power/voltage closed-loop control of the whole power station;
3. the coordination control method and the device provided by the invention can realize different reactive power control modes of power grid dispatching, and have strong control adaptability;
4. the coordination control method and the device provided by the invention have universality, and the control structure is suitable for new energy power stations with different installed capacities and different access levels.
Drawings
FIG. 1 is a flow chart of a reactive voltage comprehensive coordination control method of a new energy power station;
FIG. 2 is a model of a wind farm reactive voltage comprehensive coordination control simulation example test system provided by the invention;
FIG. 3 is a comparison curve of a voltage reference value and a measured value of a reactive voltage control grid-connected point of a wind farm provided by the invention in a voltage control mode;
FIG. 4 is a simulation curve of reactive measurement values of grid-connected points of reactive voltage control of a wind farm in a voltage control mode according to the present invention;
FIG. 5 is a photovoltaic power station reactive voltage comprehensive coordination control simulation example test system model provided by the invention;
FIG. 6 is a simulation comparison curve of reactive power reference value and measured value of a grid-connected point of reactive voltage control of a photovoltaic power station in a reactive power control mode according to the present invention;
FIG. 7 is a simulation curve of the voltage of the reactive voltage control grid-connected point of the photovoltaic power station adopting the reactive power control mode provided by the invention;
fig. 8 is a block diagram of the reactive voltage integrated coordination control device of the new energy power station.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides a reactive voltage coordination control method for a new energy power station, which comprises the following steps as shown in figure 1:
calculating a reactive power demand value of the new energy power station according to a scheduling instruction output by the power grid scheduling system;
determining reactive power output reference values of specific units of the new energy power station according to the reactive power demand values of the new energy power station;
and adjusting the reactive power output value of each specific unit of the new energy power station to be the reactive power output reference value.
Specifically, calculating the reactive power demand value of the new energy power station according to a dispatching instruction output by a power grid dispatching system comprises the following steps:
when the power grid dispatching system adopts a reactive power control mode, the dispatching instruction output by the power grid dispatching system is a power station grid-connected point reactive power reference value QrefAnd determining the reactive power demand value of the new energy power station according to the following formula:
Qord＝Qref+Qloss
when the power grid dispatching system adopts a power factor control mode, the dispatching instruction output by the power grid dispatching system is a power factor reference value PF of a power station grid-connected pointrefAnd determining the reactive power demand value of the new energy power station according to the following formula:
Figure BDA0002037505440000081
when the power grid dispatching system adopts a fixed voltage system mode, the dispatching instruction output by the power grid dispatching system is the voltage U of the power station grid-connected pointrefAnd then determining the reactive power demand value of the new energy power station according to the following formula:
Figure BDA0002037505440000082
when the power grid dispatching system adopts a reactive/voltage droop control mode, the dispatching instruction output by the power grid dispatching system is the voltage U of the power station grid-connected pointrefAnd then determining the reactive power demand value of the new energy power station according to the following formula:
Qord＝Q0+Qadj+Qloss
in the above formula, QrefFor under dispatchingA reactive power command is sent; qlossThe reactive power loss of the new energy power station is achieved; pPOIThe active power measured value of the grid-connected point; qadjAdjusting the reactive power of the new energy power station; qSVCThe reactive power of a reactive power compensation device in the new energy power station is obtained;
Figure BDA0002037505440000083
the total reactive power value is generated by the new energy generator set; n is the number of the units of the new energy power station; q0And the dispatching instruction output by the power grid dispatching system is the corresponding reactive power of the power station grid-connected point voltage.
Further, determining the reactive power adjustment quantity Q of the new energy power station according to the following formulaadj：
Qadj＝kqv×(Uref-UPOI)
In the above formula, UrefThe reactive voltage is issued for dispatching; k is a radical ofqvThe reactive voltage regulation coefficient; u shapePOIIs a voltage measurement of the grid-connected point.
Specifically, the determining the reactive power output reference value of each specific unit of the new energy power station according to the reactive power demand value of the new energy power station includes:
determining a reactive power reference value of the ith new energy generator set according to the following formula:
Figure BDA0002037505440000091
or determining a reactive power reference value of the ith new energy generator set according to the following formula:
Figure BDA0002037505440000092
or when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system, determining the reactive power reference value of the ith new energy generator set according to the following formula:
Qref_i＝Qmeas_i
when the rated output reactive power of the new energy generator set is greater than the measured reactive power issued by the system, determining the reactive power reference value of the ith new energy generator set according to the following formula:
Qref_i＝D′i×Qord
in the above formula, Qref_iDistributing a reactive power reference value to the ith new energy generator set; PF (particle Filter)plantThe power factor of the new energy power station;
Figure BDA0002037505440000093
the maximum reactive capacity of the ith new energy generator set participating in reactive power control is obtained;
Figure BDA0002037505440000094
the sum of the maximum reactive capacity of all new energy generator sets participating in reactive power control; qmeas_jThe measured value of the reactive power of the jth new energy generator set is obtained; diAnd distributing the reactive power of the ith new energy generator set when the rated output reactive power of the set is greater than the measured reactive power issued by the system.
Further, the power factor PF of the new energy power station is determined according to the following formulaplant:
Figure BDA0002037505440000095
In the above formula, SIGMA Pmeas_iThe active power sum of the new energy generator set.
Further, when the rated output reactive power of the new energy generator set is determined to be larger than the measured reactive power issued by the system according to the following formula, the reactive power distribution factor D of the ith new energy generator set is determinedi′：
Figure BDA0002037505440000096
Determining that the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system according to the following formulaDistribution factor D of output reactive power of energy generator seti”'：
Di”'＝Qmeas_i/Qord
In the above formula, DiOutputting an initial distribution factor of reactive power for the ith new energy generator set; diAnd outputting an initial distribution factor of the reactive power for the ith new energy generator set when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system.
For example, in the preferred embodiment of the invention:
taking a PowerFactory platform as an example, respectively establishing a wind power plant reactive voltage comprehensive coordination control method test model and a photovoltaic power station reactive voltage comprehensive coordination control method test model, respectively performing power station reactive voltage coordination control performance test under a reactive power control mode and a voltage control mode adopted by power grid scheduling, and observing whether a grid connection point reactive power and voltage measurement value can accurately respond to a scheduling control demand by changing a scheduling reactive power instruction and a voltage instruction so as to verify the accuracy of the new energy power station reactive voltage comprehensive coordination control method provided by the invention.
When a simulation test of a voltage control mode of a wind power plant is carried out, a test model of a reactive voltage control method of the wind power plant is shown in figure 2, the capacity of the wind power plant in the figure is 300MW, the wind power plant consists of 200 double-fed wind power units of 1.5MW, the wind power units in the figure are equivalent to 1 by adopting single-machine multiplication, the wind power units are boosted to 35kV through box transformer, then are connected to the low-voltage side of a point of connection (POI) through feeders in the plant and are sent to a power grid after being boosted to 220KV by a booster transformer of the wind power plant, an external power grid system is replaced by an equivalent generator and a load, meanwhile, the point of connection of the.
The wind power plant operates in a constant voltage control mode, the voltage value of a grid-connected point is controlled to be 1.0pu, a 50MVar capacitor connected to the grid-connected point is cut off for 30s, the system voltage is reduced, and the parameter and delay setting of a controller are the same as those of the constant reactive power mode; as shown in the wind farm grid-tie point voltage diagram 3 and the reactive power output diagram 4.
As can be seen from fig. 3 and 4, when the voltage control mode is adopted, the reactive power control system needs to continuously increase the reactive power output through multiple adjustments, and finally stabilizes the voltage of the grid-connected point near the reference value.
When a reactive power control mode simulation test of a photovoltaic power station is carried out, a grid-connected operation control example system of the photovoltaic power station is established, as shown in fig. 5, the power supply of the system is the photovoltaic power station, the capacity of the system is 200MW, the system consists of 400 photovoltaic power station units with single machine capacity of 0.5MW, the photovoltaic power station units in a field are equivalent to 1 by adopting single machine multiplication, and an external power grid system is replaced by an equivalent generator and a load.
When the photovoltaic power station operates in a reactive power control mode, the reactive power instruction value of the photovoltaic power station is changed to 20MVar when t is 10s, the active power instruction value of the photovoltaic power station is changed to 50MVar when t is 50s, and the active power instruction value of the photovoltaic power station is changed to 10Mvar when t is 80s, as shown in a reactive power diagram 6 and a reactive power instruction graph 7 (a solid line is a reference value and a dotted line is a measured value) of a photovoltaic power station grid-connected point.
As can be seen from fig. 6 and 7, when the reactive power instruction value of the photovoltaic power station changes, the reactive control system in the power station changes the reactive output by adjusting the photovoltaic power generation system and the reactive compensation device, which is the same as the reactive control system in the wind farm, and both the photovoltaic power generation control system and the dynamic reactive compensation control system belong to electrical control, and the system adjustment time is relatively short.
Example 2
Based on the same inventive concept, embodiment 2 of the present invention further provides a new energy power station reactive voltage coordination control apparatus, as shown in fig. 8, including: the functions of the calculation module, the determination module and the adjustment module are explained in detail as follows:
a calculation module: calculating a reactive power demand value of the new energy power station according to a scheduling instruction output by the power grid scheduling system;
a determination module: determining reactive power output reference values of specific units of the new energy power station according to the reactive power demand values of the new energy power station;
an adjusting module: and adjusting the reactive power output value of each specific unit of the new energy power station to be the reactive power output reference value.
Specifically, the calculation module is configured to:
when the power grid dispatching system adopts a reactive power control mode, the dispatching instruction output by the power grid dispatching system is a power station grid-connected point reactive power reference value QrefAnd determining the reactive power demand value of the new energy power station according to the following formula:
Qord＝Qref+Qloss
when the power grid dispatching system adopts a power factor control mode, the dispatching instruction output by the power grid dispatching system is a power factor reference value PF of a power station grid-connected pointrefAnd determining the reactive power demand value of the new energy power station according to the following formula:
Figure BDA0002037505440000111
when the power grid dispatching system adopts a fixed voltage system mode, the dispatching instruction output by the power grid dispatching system is the voltage U of the power station grid-connected pointrefAnd then determining the reactive power demand value of the new energy power station according to the following formula:
Figure BDA0002037505440000112
when the power grid dispatching system adopts a reactive/voltage droop control mode, the dispatching instruction output by the power grid dispatching system is the voltage U of the power station grid-connected pointrefAnd then determining the reactive power demand value of the new energy power station according to the following formula:
Qord＝Q0+Qadj+Qloss
in the above formula, QrefA reactive power instruction is issued for scheduling; qlossThe reactive power loss of the new energy power station is achieved; pPOIThe active power measured value of the grid-connected point; qadjAdjusting the reactive power of the new energy power station;QSVCthe reactive power of a reactive power compensation device in the new energy power station is obtained;
Figure BDA0002037505440000121
the total reactive power value is generated by the new energy generator set; n is the number of the units of the new energy power station; q0And the dispatching instruction output by the power grid dispatching system is the corresponding reactive power of the power station grid-connected point voltage.
Further, determining the reactive power adjustment quantity Q of the new energy power station according to the following formulaadj：
Qadj＝kqv×(Uref-UPOI)
In the above formula, UrefThe reactive voltage is issued for dispatching; k is a radical ofqvThe reactive voltage regulation coefficient; u shapePOIIs a voltage measurement of the grid-connected point.
Specifically, the determining module is configured to:
determining a reactive power reference value of the ith new energy generator set according to the following formula:
Figure BDA0002037505440000122
or determining a reactive power reference value of the ith new energy generator set according to the following formula:
Figure BDA0002037505440000123
or when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system, determining the reactive power reference value of the ith new energy generator set according to the following formula:
Qref_i＝Qmeas_i
when the rated output reactive power of the new energy generator set is greater than the measured reactive power issued by the system, determining the reactive power reference value of the ith new energy generator set according to the following formula:
Qref_i＝Di′×Qord
in the above formula, Qref_iDistributing a reactive power reference value to the ith new energy generator set; PF (particle Filter)plantThe power factor of the new energy power station;
Figure BDA0002037505440000124
the maximum reactive capacity of the ith new energy generator set participating in reactive power control is obtained;
Figure BDA0002037505440000125
the sum of the maximum reactive capacity of all new energy generator sets participating in reactive power control; qmeas_jThe measured value of the reactive power of the jth new energy generator set is obtained; d'iAnd distributing the reactive power distribution factor of the ith new energy generator set when the rated output reactive power of the set is greater than the measured reactive power issued by the system.
Further, the power factor PF of the new energy power station is determined according to the following formulaplant:
Figure BDA0002037505440000131
In the above formula, SIGMA Pmeas_iThe active power sum of the new energy generator set.
Further, when the rated output reactive power of the new energy generator set is determined to be larger than the measured reactive power issued by the system according to the following formula, the reactive power distribution factor D 'of the ith new energy generator set'i：
Figure BDA0002037505440000132
Determining a distribution factor D of the output reactive power of the ith new energy generator set when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system according to the following formulai”'：
Di”'＝Qmeas_i/Qord
In the above formula, DiOutputting an initial distribution factor of reactive power for the ith new energy generator set; diAnd outputting an initial distribution factor of the reactive power for the ith new energy generator set when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (12)

1. A reactive voltage coordination control method for a new energy power station is characterized by comprising the following steps:
calculating a reactive power demand value of the new energy power station according to a scheduling instruction output by the power grid scheduling system;
determining reactive power output reference values of specific units of the new energy power station according to the reactive power demand values of the new energy power station;
and adjusting the reactive power output value of each specific unit of the new energy power station to be the reactive power output reference value.
2. The method of claim 1, wherein calculating the new energy power station reactive power demand value according to the scheduling instruction output by the grid scheduling system comprises:
when the power grid dispatching system adopts a reactive power control mode, the dispatching instruction output by the power grid dispatching system is a power station grid-connected point reactive power reference value QrefAnd determining the reactive power demand value of the new energy power station according to the following formula:
Qord＝Qref+Qloss
when the power grid dispatching system adopts a power factor control mode, the dispatching instruction output by the power grid dispatching system is a power factor reference value PF of a power station grid-connected pointrefAnd determining saidReactive power demand value of new energy power station:
Figure FDA0002037505430000011
when the power grid dispatching system adopts a fixed voltage system mode, the dispatching instruction output by the power grid dispatching system is the voltage U of the power station grid-connected pointrefAnd then determining the reactive power demand value of the new energy power station according to the following formula:
Figure FDA0002037505430000012
when the power grid dispatching system adopts a reactive/voltage droop control mode, the dispatching instruction output by the power grid dispatching system is the voltage U of the power station grid-connected pointrefAnd then determining the reactive power demand value of the new energy power station according to the following formula:
Qord＝Q0+Qadj+Qloss
in the above formula, QrefA reactive power instruction is issued for scheduling; qlossThe reactive power loss of the new energy power station is achieved; pPOIThe active power measured value of the grid-connected point; qadjAdjusting the reactive power of the new energy power station; qSVCThe reactive power of a reactive power compensation device in the new energy power station is obtained;
Figure FDA0002037505430000013
the total reactive power value is generated by the new energy generator set; n is the number of the units of the new energy power station; q0And the dispatching instruction output by the power grid dispatching system is the corresponding reactive power of the power station grid-connected point voltage.
3. The method of claim 2, wherein the new energy plant reactive power adjustment Q is determined as followsadj：
Qadj＝kqv×(Uref-UPOI)
In the above formula, UrefThe reactive voltage is issued for dispatching; k is a radical ofqvThe reactive voltage regulation coefficient; u shapePOIIs a voltage measurement of the grid-connected point.
4. The method of claim 1, wherein determining the reactive power output reference value for each particular group of the new energy power station from the new energy power station reactive power demand value comprises:
determining a reactive power reference value of the ith new energy generator set according to the following formula:
Figure FDA0002037505430000021
or determining a reactive power reference value of the ith new energy generator set according to the following formula:
Figure FDA0002037505430000022
or when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system, determining the reactive power reference value of the ith new energy generator set according to the following formula:
Qref_i＝Qmeas_i
when the rated output reactive power of the new energy generator set is greater than the measured reactive power issued by the system, determining the reactive power reference value of the ith new energy generator set according to the following formula:
Qref_i＝D′i×Qord
in the above formula, Qref_iDistributing a reactive power reference value to the ith new energy generator set; PF (particle Filter)plantThe power factor of the new energy power station;
Figure FDA0002037505430000023
the maximum reactive capacity of the ith new energy generator set participating in reactive power control is obtained;
Figure FDA0002037505430000024
the sum of the maximum reactive capacity of all new energy generator sets participating in reactive power control; qmeas_jThe measured value of the reactive power of the jth new energy generator set is obtained; d'iAnd distributing the reactive power distribution factor of the ith new energy generator set when the rated output reactive power of the set is greater than the measured reactive power issued by the system.
5. The method of claim 4, wherein the new energy plant power factor PF is determined as followsplant:
Figure FDA0002037505430000025
In the above formula, SIGMA Pmeas_iThe active power sum of the new energy generator set.
6. The method of claim 4, wherein the reactive power distribution factor D 'of the ith new energy generator set when the rated output reactive power of the new energy generator set is determined to be greater than the measured reactive power issued by the system according to the following formula'i：
Figure FDA0002037505430000031
Determining a distribution factor D 'of the reactive power output by the ith new energy generator set when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system according to the following formula'i：
D″′i＝Qmeas_i/Qord
In the above formula, DiOutputting an initial distribution factor of reactive power for the ith new energy generator set; d ″)iAnd outputting an initial distribution factor of the reactive power for the ith new energy generator set when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system.
7. A reactive voltage coordination control device of a new energy power station is characterized by comprising:
a calculation module: calculating a reactive power demand value of the new energy power station according to a scheduling instruction output by the power grid scheduling system;
a determination module: determining reactive power output reference values of specific units of the new energy power station according to the reactive power demand values of the new energy power station;
an adjusting module: and adjusting the reactive power output value of each specific unit of the new energy power station to be the reactive power output reference value.
8. The apparatus of claim 7, wherein the computing module is to:
when the power grid dispatching system adopts a reactive power control mode, the dispatching instruction output by the power grid dispatching system is a power station grid-connected point reactive power reference value QrefAnd determining the reactive power demand value of the new energy power station according to the following formula:
Qord＝Qref+Qloss
when the power grid dispatching system adopts a power factor control mode, the dispatching instruction output by the power grid dispatching system is a power factor reference value PF of a power station grid-connected pointrefAnd determining the reactive power demand value of the new energy power station according to the following formula:
Figure FDA0002037505430000032
when the power grid dispatching system adopts a fixed voltage system mode, the dispatching instruction output by the power grid dispatching system is the voltage U of the power station grid-connected pointrefAnd then determining the reactive power demand value of the new energy power station according to the following formula:
Figure FDA0002037505430000041
when the power grid dispatching system adopts a reactive/voltage droop control mode, the power grid dispatching system outputsThe dispatching instruction is the voltage U of the grid-connected point of the power stationrefAnd then determining the reactive power demand value of the new energy power station according to the following formula:
Qord＝Q0+Qadj+Qloss
in the above formula, QrefA reactive power instruction is issued for scheduling; qlossThe reactive power loss of the new energy power station is achieved; pPOIThe active power measured value of the grid-connected point; qadjAdjusting the reactive power of the new energy power station; qSVCThe reactive power of a reactive power compensation device in the new energy power station is obtained;
Figure FDA0002037505430000042
the total reactive power value is generated by the new energy generator set; n is the number of the units of the new energy power station; q0And the dispatching instruction output by the power grid dispatching system is the corresponding reactive power of the power station grid-connected point voltage.
9. The apparatus of claim 8, wherein the reactive power adjustment Q of the new energy plant is determined byadj：
Qadj＝kqv×(Uref-UPOI)
In the above formula, UrefThe reactive voltage is issued for dispatching; k is a radical ofqvThe reactive voltage regulation coefficient; u shapePOIIs a voltage measurement of the grid-connected point.
10. The apparatus of claim 7, wherein the determination module is to:
determining a reactive power reference value of the ith new energy generator set according to the following formula:
Figure FDA0002037505430000043
or determining a reactive power reference value of the ith new energy generator set according to the following formula:
Figure FDA0002037505430000044
or when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system, determining the reactive power reference value of the ith new energy generator set according to the following formula:
Qref_i＝Qmeas_i
when the rated output reactive power of the new energy generator set is greater than the measured reactive power issued by the system, determining the reactive power reference value of the ith new energy generator set according to the following formula:
Qref_i＝D′i×Qord
in the above formula, Qref_iDistributing a reactive power reference value to the ith new energy generator set; PF (particle Filter)plantThe power factor of the new energy power station;
Figure FDA0002037505430000051
the maximum reactive capacity of the ith new energy generator set participating in reactive power control is obtained;
Figure FDA0002037505430000052
the sum of the maximum reactive capacity of all new energy generator sets participating in reactive power control; qmeas_jThe measured value of the reactive power of the jth new energy generator set is obtained; d'iAnd distributing the reactive power distribution factor of the ith new energy generator set when the rated output reactive power of the set is greater than the measured reactive power issued by the system.
11. The apparatus of claim 10, wherein the new energy plant power factor PF is determined as followsplant:
Figure FDA0002037505430000053
In the above formula, SIGMA Pmeas_iThe active power sum of the new energy generator set.
12. The apparatus of claim 10, wherein the reactive power distribution factor D 'of the ith new energy generator set when the rated output reactive power of the new energy generator set is determined to be greater than the measured reactive power issued by the system according to the following formula'i：
Figure FDA0002037505430000054
Determining a distribution factor D 'of the reactive power output by the ith new energy generator set when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system according to the following formula'i：
D″′i＝Qmeas_i/Qord
In the above formula, DiOutputting an initial distribution factor of reactive power for the ith new energy generator set; d ″)iAnd outputting an initial distribution factor of the reactive power for the ith new energy generator set when the rated output reactive power of the new energy generator set is smaller than the measured reactive power issued by the system.
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