CN115693770A - Improved droop curve dynamic pressure regulating method and pressure regulating system for closed-loop verification - Google Patents
Improved droop curve dynamic pressure regulating method and pressure regulating system for closed-loop verification Download PDFInfo
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- CN115693770A CN115693770A CN202211390759.6A CN202211390759A CN115693770A CN 115693770 A CN115693770 A CN 115693770A CN 202211390759 A CN202211390759 A CN 202211390759A CN 115693770 A CN115693770 A CN 115693770A
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Abstract
The invention discloses a method for monitoring voltage of a grid-connected point and reactive power of a station, calculating a reactive power output value by a reactive voltage regulation coefficient, and sending an instruction to reactive power source equipment of a power station; monitoring the real-time voltage of the grid-connected point and the reactive power of the station again, wherein if the real-time voltage is positioned in a voltage regulation dead zone, the dynamic voltage regulation reaches a target value, and the voltage regulation is not carried out any more; and if the voltage of the grid-connected point is still outside the voltage regulation dead zone of the grid-connected point, correcting the reactive voltage regulation coefficient according to the monitored real-time voltage and the reactive power of the station, and then dynamically regulating the droop curve by using the corrected reactive voltage regulation coefficient until the voltage is regulated to be within the dead zone range. By adopting the improved droop adjustment of the closed-loop check, the rapidity of the open-loop droop adjustment is kept, and meanwhile, the accuracy of the closed-loop adjustment is also achieved. In the pressure regulating process, the problem of regulating oscillation can be effectively prevented by controlling the frequency of closed-loop feedback so as to solve the problem of insufficient pressure regulation in the existing dynamic pressure regulation.
Description
Technical Field
The invention relates to new energy power generation grid connection, in particular to an improved droop curve dynamic voltage regulation method and a voltage regulation system for closed-loop verification.
Background
At present, new energy power generation is continuously and rapidly developed, a clean, low-carbon, safe and efficient energy system is constructed, and a novel power system taking new energy as a main body is constructed. With the continuous improvement of new energy permeability, the power system is changed into a complex system mainly based on novel power electronic equipment.
However, due to the timeliness and volatility of new energy power generation (photovoltaic power generation, wind power generation, etc.), the operation stability of the power system is affected, and the power quality is reduced. One of the key factors influencing the quality of electric energy is the voltage fluctuation of a power grid, so that the problem of voltage fluctuation caused by large-scale new energy grid connection becomes a difficult problem to be solved urgently.
In order to solve the problem of voltage fluctuation caused by large-scale new energy grid connection, the new energy station is required to have dynamic voltage regulation capacity. However, in the prior art, the dynamic voltage regulation function of the new energy station mostly follows the control mode of the traditional dynamic reactive voltage regulation droop curve shown in fig. 1, and the problem of insufficient voltage regulation often exists.
Disclosure of Invention
The purpose of the invention is as follows: in view of the above disadvantages, the present invention provides an improved droop curve dynamic voltage regulation method and voltage regulation system for fast and accurate closed-loop verification.
The technical scheme is as follows: in order to solve the problems, the invention adopts an improved droop curve dynamic pressure regulating method for closed-loop verification, which comprises the following steps:
step 1, acquiring real-time voltage at a grid-connected point of a new energy power generation system and a power distribution network and reactive power of the new energy power generation system;
step 2, determining that the obtained real-time voltage is out of the target voltage range
Calculating the adjustment quantity of the reactive power of the new energy power generation system according to the droop coefficient of the reactive voltage regulation, and adjusting the reactive power output by equipment in the new energy power generation system according to the calculated adjustment quantity;
step 3, acquiring the voltage at the grid-connected point after the reactive power output by the new energy power generation system is adjusted;
and if the adjusted real-time voltage is within the target voltage range, correcting the droop coefficient according to the adjusted real-time voltage and the reactive power of the new energy power generation system, calculating the adjustment quantity of the reactive power of the new energy power generation system according to the corrected droop coefficient, adjusting the reactive power output by equipment in the new energy power generation system according to the calculated adjustment quantity, and returning to the step 1.
Further, in the step 2, the target voltage range is (U) N -△U)≤U≤(U N +. DELTA U), U is the real-time voltage of the grid-connected point, U N The voltage is the rated voltage of the grid-connected point, and the delta U is the regulation dead zone of the grid-connected point voltage. The adjustment dead zone range of the grid-connected point voltage is within +/-0.5% - +/-2% of the rated voltage.
Further, in the step 2, a calculation formula for adjusting the reactive output Q of the equipment in the new energy power generation system is as follows:
wherein Q A For the upper limit, Q, of the reactive power output by equipment in the new energy power generation system B For outputting lower limit, U, of reactive power of equipment in new energy power generation system low For adjusting the lower limit, U, of the grid-connected point voltage high Adjusting upper limit, Q, for grid-connected point voltage 0 And K is the droop coefficient of reactive power voltage regulation.
Further, the formula for correcting the droop coefficient in step 3 is as follows:
and Q 'is the reactive output of the regulated new energy power generation system equipment, and U' is the regulated grid-connected point voltage. The value range of the droop coefficient K of the reactive power voltage regulation is 2-15 at the beginning.
The invention also adopts an improved droop curve dynamic pressure regulating system for closed-loop verification, which comprises a data acquisition module, a calculation module and a regulation module, wherein:
the data acquisition module is used for acquiring real-time voltage at a grid connection point of the new energy power generation system and the power distribution network and reactive power of the new energy power generation system;
the calculation module is used for calculating the adjustment quantity of the reactive power of the new energy power generation system according to the droop coefficient of the reactive power voltage adjustment when the obtained real-time voltage is determined to be within the target voltage range; the droop coefficient is corrected according to the real-time voltage adjusted by the adjusting module and the reactive power of the new energy power generation system;
and the adjusting module is used for adjusting the reactive power output by the equipment in the new energy power generation system according to the calculated adjusting quantity.
Has the advantages that: compared with the prior art, the method has the obvious advantages that the improved droop adjustment of the closed-loop check is adopted, so that the rapidity of the open-loop droop adjustment is kept, and meanwhile, the accuracy of the closed-loop adjustment is also achieved. In the pressure regulating process, the problem of regulating oscillation can be effectively prevented by controlling the frequency of closed-loop feedback so as to solve the problem of insufficient pressure regulation in the existing dynamic pressure regulation.
Drawings
FIG. 1 illustrates a prior art dynamic reactive voltage regulation droop curve;
FIG. 2 is a flow chart of a dynamic voltage regulation method of the present invention;
FIG. 3 shows the dynamic reactive voltage regulation droop curve in the present invention;
FIG. 4 is a schematic diagram of a wind farm site and EMS serially deployed fast power control device employing the voltage regulation system of the present invention;
FIG. 5 is a schematic diagram of a wind farm site and EMS deployed in parallel with a fast power control device employing a voltage regulation system of the present invention;
FIG. 6 is a schematic diagram of a photovoltaic power plant and an EMS serially deployed fast power control apparatus employing the voltage regulation system of the present invention;
fig. 7 is a schematic diagram of a photovoltaic power station and an EMS parallel deployed fast power control device applying the voltage regulation system of the present invention.
Detailed Description
Example 1
As shown in fig. 2, the method for dynamically adjusting the droop curve in the closed-loop verification in this embodiment includes the following steps:
(1) Acquiring real-time voltage of a new energy power generation system (a wind power plant or a photovoltaic power generation station and other stations) and a power distribution network grid-connected point and reactive power of the new energy power generation system;
(2) Judging whether the obtained real-time voltage is within a target voltage range, if the real-time voltage is outside the target voltage range, performing the step (3), and if the real-time voltage is within the target voltage range, finishing the adjustment;
(3) Calculating the adjustment quantity of the reactive power of the new energy power generation system according to the droop coefficient of the reactive voltage adjustment, adjusting the whole station reactive power source equipment to increase the reactive output when the real-time voltage of the grid-connected point is smaller than the target voltage range and enters an action area, wherein the upper limit of the reactive output is Q A (ii) a When the real-time voltage of the grid-connected point is larger than the target voltage range and enters an action zone, the whole station reactive power source equipment is adjusted to reduce reactive output, and the lower limit of the reactive output is Q B . Target voltage range of (U) N -△U)≤U≤(U N +. DELTA U), U is the real-time voltage of the grid-connected point, U N The voltage is the rated voltage of the grid-connected point, and the delta U is the regulation dead zone of the grid-connected point voltage.
The calculation formula for adjusting the reactive output Q of the equipment in the new energy power generation system is as follows:
wherein Q is A For the upper limit, Q, of the reactive power output by equipment in the new energy power generation system B For outputting lower limit, U, of reactive power of equipment in new energy power generation system low For adjusting the lower limit of the grid-connected point voltage, U high To a point of grid connectionUpper limit of voltage regulation, Q 0 And K is the droop coefficient of reactive power voltage regulation for the current output reactive power of equipment in the new energy power generation system.
The droop coefficient K of the reactive power voltage regulation is reasonably set according to the capacity of a reactive power compensation device of the new energy station and the actual situation of a local power grid, the value range is generally 2-15, and the typical value is 6.
The reactive voltage regulation is to set a voltage dead zone for controlling reactive voltage droop according to the requirements of a local power grid, and the dead zone range is generally set to be between +/-0.5% and +/-2% of rated voltage.
Adjusting the reactive output of equipment in the new energy power generation system according to the calculated adjustment quantity;
(4) Acquiring voltage at a grid-connected point after reactive output regulation of the new energy power generation system;
(5) Judging whether the regulated real-time voltage is within a target voltage range, if the real-time voltage is outside the target voltage range, performing the step (6), and if the real-time voltage is within the target voltage range, finishing the regulation;
(6) And (3) correcting the droop coefficient according to the adjusted real-time voltage and the reactive power of the new energy power generation system, calculating the adjustment quantity of the reactive power of the new energy power generation system according to the corrected droop coefficient, adjusting the reactive output of equipment in the new energy power generation system according to the calculated adjustment quantity, and returning to the step (2). The droop coefficient is corrected by the formula:
and Q 'is the reactive output of the regulated new energy power generation system equipment, and U' is the regulated grid-connected point voltage. The voltage regulating method not only keeps the rapidity of open-loop droop regulation, but also has the accuracy of closed-loop regulation. In the pressure regulating process, the problem of regulating oscillation can be effectively prevented by controlling the frequency of closed loop feedback.
When the power station carries out dynamic reactive power voltage regulation, firstly, the voltage U of the grid-connected point and the reactive power Q of the power station are monitored, and the theoretical grid-connected point dynamic reactive power voltage regulation coefficient K is used for calculatingOutputting a reactive power output value, and sending an instruction to the reactive power source equipment of the power station; then monitoring the real-time voltage U and the reactive power Q of the station of the grid-connected point and the rated voltage U of the grid-connected point again N A comparison is made. If (U) N -△U)≤U≤(U N Plus delta U), the dynamic voltage regulation reaches the target value, and the voltage regulation is not carried out any more; and if the voltage U of the grid-connected point is still outside the voltage regulation dead zone of the grid-connected point, correcting the reactive voltage regulation coefficient K according to the monitored real-time voltage U and the reactive power Q of the station, and then carrying out droop curve dynamic voltage regulation by using the corrected reactive voltage regulation coefficient until the voltage regulation is within the dead zone range. In the dynamic voltage regulation process, attention needs to be paid to the reactive power regulation upper limit Q of the station A And a reactive power regulation lower limit Q B If the reactive command exceeds the upper limit Q A Or below the lower limit Q B Then the output reactive command should be Q A Or Q B 。
As shown in FIG. 3, the voltage of the grid-connected point is monitored to be U', and the reactive power of the current station is Q 0 Firstly, regulating voltage according to a theoretical grid-connected point dynamic voltage regulation coefficient K, and calculating that a reactive instruction issued to a station is Q'; when the reactive power of the station is adjusted to Q ', the voltage of the grid-connected point is measured again to be U ', and then the reactive voltage-regulating coefficient K is corrected to be (Q ' -Q) 0 )/[U″-(U N -△U)]And if dynamic voltage regulation is carried out again according to the corrected reactive voltage regulation coefficient, the station issues a reactive instruction of Q'.
Example 2
In this embodiment, an improved generation droop curve dynamic pressure regulating system of closed loop check-up includes data acquisition module, judge module, calculation module and regulating module, wherein:
the data acquisition module is used for acquiring real-time voltage at a grid connection point of the new energy power generation system and the power distribution network and reactive power of the new energy power generation system;
the judging module is used for judging whether the acquired real-time voltage is within a target voltage range;
the calculation module is used for calculating the reactive power regulating quantity of the new energy power generation system according to the droop coefficient of the reactive power voltage regulation; the droop coefficient is corrected according to the real-time voltage adjusted by the adjusting module and the reactive power of the new energy power generation system;
and the adjusting module is used for adjusting the reactive output of the equipment in the new energy power generation system according to the calculated adjusting quantity.
The adjusting system is arranged on the rapid power control device of the new energy station, and the device is deployed in a secondary net rack of the new energy station, and the deployment mode of the adjusting system is generally divided into a serial mode and a parallel mode.
1. Wind farm
The EMS of the wind power plant is deployed on a station control layer, receives the dispatching instruction through the remote motor, sends a reactive instruction to a down-wind turbine energy management system, and then the wind turbine energy management system sends subdivision instructions to each wind turbine. As shown in fig. 4, the fast power control device of the new energy station is deployed in series with the EMS, and the device needs to forward a reactive instruction sent by the EMS in addition to realizing the dynamic reactive voltage regulation function. If the device and the EMS are deployed in parallel as shown in FIG. 5, when the EMS issues a reactive instruction to the wind turbine management system, the device receives the reactive instruction and locks the instruction; when detecting that the voltage of the grid connection point enters a dynamic reactive power voltage regulation range, the device sends a signal to lock the EMS, and simultaneously sends a reactive power instruction to the fan energy management system; when the dynamic reactive power voltage regulation is finished, the device sends a locking releasing signal to the EMS, the EMS continues to send a reactive power instruction to the fan function management system, and at the moment, the device locks the instruction sent by the device.
2. Photovoltaic power station
The EMS of the photovoltaic power station is deployed on a station control layer, receives the dispatching instruction through the remote motor and issues the dispatching instruction to each communication management unit of the photovoltaic array. For example, in fig. 6, when the new energy station fast power control device dynamically adjusts the reactive power, the fast power control device issues a reactive power instruction to the EMS, and then the EMS issues the reactive power instruction to the photovoltaic communication management unit. As shown in fig. 7, the device and the EMS are deployed in parallel, when the voltage of the grid-connected point is in a normal range, the EMS sends a steady-state instruction to the photovoltaic communication management unit and the fast power control device simultaneously, and the device locks the instruction issued by the device; when the voltage of the grid-connected point enters a dynamic reactive power voltage regulation range, the rapid power control device sends a signal to the EMS to lock the steady state instruction of the EMS, and simultaneously sends a reactive power instruction to the photovoltaic communication management unit; when the dynamic reactive power voltage regulation is finished, the device sends a signal to the EMS to remove the steady instruction locking and simultaneously locks the instruction issued by the device.
Based on the same inventive concept, the present invention, in one embodiment, further provides a storage medium, specifically a computer-readable storage medium, which is a memory device in a computer device and is used for storing programs and data. It is understood that the computer readable storage medium herein can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space storing an operating system of the terminal. Also, one or more instructions, which may be one or more computer programs (including program code), are stored in the memory space and are adapted to be loaded and executed by the processor. It should be noted that the computer-readable storage medium may be a high-speed RAM memory, or may be a non-volatile memory (non-volatile memory), such as at least one disk memory. One or more instructions stored in the computer-readable storage medium may be loaded and executed by the processor to implement the corresponding steps of the method for analyzing the influence of the access of the energy management system on the power distribution network in the foregoing embodiments.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present invention has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that after reading the present invention, they can make various changes, modifications or equivalents to the specific embodiments of the present invention, but these changes, modifications or equivalents are within the protection scope of the appended claims.
Claims (10)
1. An improved droop curve dynamic voltage regulation method for closed-loop verification is characterized by comprising the following steps:
step 1, acquiring real-time voltage at a grid-connected point of a new energy power generation system and a power distribution network and reactive power of the new energy power generation system;
step 2, when the obtained real-time voltage is determined to be out of the target voltage range, calculating the adjustment quantity of the reactive power of the new energy power generation system according to the droop coefficient of the reactive voltage regulation, and adjusting the reactive power output by equipment in the new energy power generation system according to the calculated adjustment quantity;
step 3, acquiring real-time voltage at a grid-connected point after the reactive power output by the new energy power generation system is adjusted; and if the adjusted real-time voltage is out of the target voltage range, correcting the droop coefficient according to the adjusted real-time voltage and the reactive power of the new energy power generation system, calculating the adjustment quantity of the reactive power of the new energy power generation system according to the corrected droop coefficient, adjusting the reactive power output by equipment in the new energy power generation system according to the calculated adjustment quantity, and returning to the step 1.
2. The voltage regulation method according to claim 1, wherein in step 2, the target voltage range is (U) N -△U)≤U≤(U N +. DELTA U), U is the real-time voltage of the grid-connected point, U N The voltage is the rated voltage of the grid-connected point, and the delta U is the regulation dead zone of the grid-connected point voltage.
3. The voltage regulation method according to claim 2, wherein the regulation dead zone range of the grid-connected point voltage is within ± 0.5% to ± 2% of the rated voltage.
4. The voltage regulation method according to claim 2, wherein the reactive power Q output by the equipment in the new energy power generation system regulated in the step 2 is calculated by the formula:
wherein Q is A For the upper limit, Q, of the reactive power output by equipment in the new energy power generation system B For outputting lower limit, U, of reactive power of equipment in new energy power generation system low To grid point voltageLower limit of regulation, U high Adjusting upper limit, Q, for grid-connected point voltage 0 And K is the droop coefficient of reactive power voltage regulation.
5. The voltage regulation method according to claim 4, wherein the droop coefficient in step 3 is modified by the formula:
and Q 'is the reactive output of the regulated new energy power generation system equipment, and U' is the regulated grid-connected point voltage.
6. The configuration method according to claim 5, wherein the droop coefficient K of the initial reactive voltage regulation is in a range of 2-15.
7. The utility model provides an improved generation droop curve dynamic voltage regulation system of closed loop check-up which characterized in that, includes data acquisition module, calculation module and regulation module, wherein:
the data acquisition module is used for acquiring real-time voltage at a grid connection point of the new energy power generation system and the power distribution network and reactive power of the new energy power generation system;
the calculation module is used for calculating the adjustment quantity of the reactive power of the new energy power generation system according to the droop coefficient of the reactive power voltage adjustment when the obtained real-time voltage is determined to be within the target voltage range; the droop coefficient is corrected according to the real-time voltage adjusted by the adjusting module and the reactive power of the new energy power generation system;
and the adjusting module is used for adjusting the reactive power output by the equipment in the new energy power generation system according to the calculated adjusting quantity.
8. The pressure regulating system of claim 7, wherein the droop coefficient in the calculation module is modified by the formula:
and Q 'is the reactive output of the regulated new energy power generation system equipment, and U' is the regulated grid-connected point voltage.
9. A computer arrangement comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 6 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
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