CN114744689A - Reactive power coordination control method and system for new energy station comprising distributed phase modulators - Google Patents

Reactive power coordination control method and system for new energy station comprising distributed phase modulators Download PDF

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CN114744689A
CN114744689A CN202210661291.3A CN202210661291A CN114744689A CN 114744689 A CN114744689 A CN 114744689A CN 202210661291 A CN202210661291 A CN 202210661291A CN 114744689 A CN114744689 A CN 114744689A
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phase modulator
reactive power
distributed phase
new energy
steady
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CN114744689B (en
Inventor
陈国平
郭铭群
贺静波
李晖
蒋维勇
张怡
王菲
张锋
索之闻
杨林
傅诗琪
李俊霖
周专
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State Grid Economic And Technological Research Institute Co LtdB412 State Grid Office
State Grid Corp of China SGCC
State Grid Xinjiang Electric Power Co Ltd
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State Grid Economic And Technological Research Institute Co LtdB412 State Grid Office
State Grid Corp of China SGCC
State Grid Xinjiang 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
    • H02J3/38—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
    • 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
    • H02J3/381—Dispersed generators
    • 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
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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Abstract

The invention relates to a reactive power coordination control method and a system for a new energy station with a distributed phase modulator, wherein the reactive power coordination control method comprises the following steps: determining a steady-state reactive power output range of the distributed phase modulator under different gears of a boost variable tap switch of the distributed phase modulator so as to determine the phase advancing/phase delaying capability of the distributed phase modulator; considering the phase advancing/phase delaying capability and the steady-state operation mode of the distributed phase modulator, and selecting the step-up transformer tap changer gear of the distributed phase modulator; and judging whether the communication between the local control AVC substation of the new energy station and the AVC main station of the system is smooth or not, and performing coordination control on the steady-state reactive output of the reactive power regulation equipment containing the distributed phase modulator according to the judgment result. The invention can ensure the reactive output capability of the distributed phase modulator, and can effectively suppress the transient overvoltage of a sending end system while meeting the reactive balance requirement of a new energy power generation system. The invention can be applied to the field of power transmission and distribution of power systems.

Description

Reactive power coordination control method and system for new energy station comprising distributed phase modulators
Technical Field
The invention relates to the technical field of power transmission and distribution of a power system, in particular to a reactive power coordination control method and system for a new energy station with a distributed phase modulator.
Background
With the rapid development of new energy, the conventional power supply of the extra-high voltage direct current sending end is gradually replaced by the new energy, the voltage supporting capability of a power system is reduced, and the transient overvoltage problem of the sending end system is prominent. Research shows that the effect of the large-capacity phase modulator arranged in the converter station on suppressing the transient overvoltage at the new energy side is limited, and the transient overvoltage at the new energy side is out of limit to become a limiting factor for limiting the capability of direct current transmission of new energy. The distributed phase modulators are arranged on the new energy side, so that the transient overvoltage of a system can be inhibited, and the high-voltage off-line of the new energy can be prevented.
Different from a large-capacity phase modulator accessed into a converter station, the distributed phase modulator accessed into the new energy side also participates in the steady reactive power balance of the system, namely, the reactive power loss of the new energy collection system is compensated. At present, a distributed phase modulator is not connected with a dispatching automatic voltage control system, and the distributed phase modulator is lack of coordination with other reactive power regulating devices of a new energy station. The existing research on reactive power coordination control mainly aims at a high-capacity phase modulator and other reactive power compensation equipment of a converter station, or SVC, SVG and static reactive power compensation equipment in a new energy power generation system, and does not relate to the steady-state reactive power output capability of a distributed phase modulator or a coordination control strategy of the distributed phase modulator and various types of reactive power regulation equipment in the new energy power generation system.
Therefore, the related research of the reactive power coordination control method of the new energy station with the distributed phase modulator needs to be carried out urgently, and the reasonable output of other reactive power regulation equipment in the distributed phase modulator and the new energy power generation system according to the system operation condition is ensured while the transient overvoltage suppression requirement of a sending end system is considered.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a reactive power coordination control method and system for a new energy station including a distributed phase modulator, which can ensure the reactive power output capability of the distributed phase modulator, and achieve effective suppression of transient overvoltage of a transmitting end system while meeting the reactive power balance requirement of a new energy power generation system.
In order to realize the purpose, the invention adopts the following technical scheme: a reactive power coordination control method for a new energy station with a distributed phase modulator comprises the following steps: determining a steady-state reactive power output range of the distributed phase modulator under different gears of a boost variable tap switch of the distributed phase modulator so as to determine the phase advancing/phase delaying capability of the distributed phase modulator; considering the phase advancing/delaying capability and the steady-state operation mode of the distributed phase modulator, and selecting the gear of the boost variable-speed tap changer of the distributed phase modulator; and judging whether the communication between the local control AVC substation of the new energy field station and the AVC main station of the system is smooth or not, and performing coordination control on the steady-state reactive output of the reactive power regulation equipment containing the distributed phase modulator according to the judgment result.
Further, the steady state reactive power output of the distributed phase modulator
Figure 672421DEST_PATH_IMAGE001
Comprises the following steps:
Figure 589561DEST_PATH_IMAGE002
in the formula (I), the compound is shown in the specification,
Figure 369298DEST_PATH_IMAGE003
the voltage per unit value at the generator end of the distributed phase modulator;
Figure 702191DEST_PATH_IMAGE004
is the voltage per unit value of the network side;
Figure 516563DEST_PATH_IMAGE005
the voltage-rise admittance per unit value is the distributed phase modulator;
Figure DEST_PATH_IMAGE006
is the per unit value of the transformation ratio of the step-up transformer.
Further, the method for selecting the step-up transformer tap changer of the distributed phase modulator considering the phase advancing/phase lag capability and the steady-state operation mode of the distributed phase modulator comprises the following steps:
selecting the reactive output of the distributed phase modulator to be +/-within the stable voltage operation range of the terminal of the distributed phase modulator and the stable voltage operation range of the network side
Figure 276708DEST_PATH_IMAGE007
The gear position of the tap changer of the motor vehicle,
Figure 543742DEST_PATH_IMAGE007
rated capacity for a distributed phase modulator;
and if a plurality of tap changer gears meeting the requirements appear, comprehensively considering the safe operation and the system requirements of the distributed phase modulator, and further selecting the corresponding tap changer gears.
Further, the method for the new energy station to locally control the communication between the AVC substation and the AVC main station of the system to be smooth and carry out coordination control on the steady-state reactive output of the reactive power regulation equipment containing the distributed phase modulators comprises the following steps:
setting an AVC control sub-module which takes transient overvoltage control as a target, wherein the output result of the AVC control sub-module is used as a constraint condition of a steady-state voltage control model in an automatic voltage control system;
and the automatic voltage control system sends instructions to reactive power regulation equipment comprising the distributed phase modulators, the new energy source unit, the power electronic type dynamic reactive power compensation equipment and the low-voltage capacitor, and the reactive power regulation equipment combination is comprehensively selected.
Further, the AVC control sub-module analyzes transient overvoltage response characteristics of different reactive power regulation equipment combinations under typical faults through transient overvoltage calculation according to the new energy operation condition to obtain response factors of each reactive power regulation equipment to the transient overvoltage, and determines the reactive power regulation equipment combination capable of improving the safety of the transient voltage of the power grid after the faults based on the response factors of each element to the transient overvoltage.
Further, the step of sending an instruction to reactive power regulation equipment including the distributed phase modulator, the new energy source unit, the power electronic type dynamic reactive power compensation equipment and the low-voltage capacitor by the automatic voltage control system, and comprehensively selecting a reactive power regulation equipment combination includes:
the reactive power supply capability of the distributed phase modulator is preferentially used, the reactive power supply capability of the new energy source unit is secondly used, when the new energy source unit is in a large-scale generation and the system has insufficient reactive power, the power electronic type dynamic reactive power compensation equipment is then put into use, and finally the low-voltage capacitor is used.
Further, the method for the new energy station to locally control the communication between the AVC substation and the AVC main station of the system is not smooth, and the method for performing coordination control on the steady-state reactive output of the reactive power regulation equipment comprising the distributed phase modulator comprises the following steps:
and calculating reactive power output of the distributed phase modulator according to the active power output of the new energy, wherein the sum of the reactive power reference value of the distributed phase modulator and the reactive power output of other types of reactive equipment is equal to the reactive power loss collected by the new energy.
A reactive power coordination control system of a new energy power generation system with a distributed phase modulator comprises: the first processing module is used for determining the steady-state reactive power output range of the distributed phase modulator under different gears of the boost variable tap switch of the distributed phase modulator so as to determine the phase advancing/phase delaying capability of the distributed phase modulator; the second processing module is used for considering the phase advancing/lagging capacity and the steady-state operation mode of the distributed phase modulator and selecting the gear of the step-up transformer tap changer of the distributed phase modulator; and the coordination control module is used for judging whether the communication between the local control AVC substation of the new energy field station and the AVC main station of the system is smooth or not and carrying out coordination control on the steady-state reactive output of the reactive power regulation equipment containing the distributed phase modulator according to the judgment result.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of the above methods.
A computing device, comprising: one or more processors, memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the above-described methods.
Due to the adoption of the technical scheme, the invention has the following advantages:
according to the invention, through reasonably setting the gear of the boost variable tap switch of the distributed phase modulator, the reactive output capability of the distributed phase modulator is ensured, the reactive balance requirement of the new energy power generation system is met, meanwhile, the transient overvoltage of the sending end system is effectively inhibited, and reference can be provided for the dispatching operation of the actual power grid.
Drawings
Fig. 1 is a schematic overall flow chart of a reactive power coordination control method of a new energy station including a distributed phase modulator according to an embodiment of the present invention;
FIG. 2 is a detailed flowchart of a coordination control method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the steady state reactive output capability of a distributed phase modulator in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of reactive power consumed by the new energy source according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the effect of 50Mvar on over-voltage transient in one embodiment of the present invention;
fig. 6 is a schematic diagram illustrating an influence of a new energy reactive power output of 50Mvar on a transient overvoltage in an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating the effect of reactive power output 50Mvar of the distributed phase modulator on transient overvoltage in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the description of the embodiments of the invention given above, are within the scope of protection of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The invention provides a reactive power coordination control method and a system for a new energy power generation system with a distributed phase modulator, which comprises the following steps: determining a steady-state reactive power output range of the distributed phase modulator under different gears of a boost variable tap switch of the distributed phase modulator so as to determine the phase advancing/phase delaying capability of the distributed phase modulator; considering the phase advancing/phase delaying capability and the steady-state operation mode of the distributed phase modulator, and selecting the step-up transformer tap changer gear of the distributed phase modulator; and judging whether the communication between the local control AVC substation of the new energy field station and the AVC main station of the system is smooth or not, and performing coordination control on the steady-state reactive output of the reactive power regulation equipment containing the distributed phase modulators according to the judgment result. The invention can ensure the reactive output capability of the distributed phase modulator, and can effectively suppress the transient overvoltage of a sending end system while meeting the reactive balance requirement of a new energy power generation system.
In an embodiment of the present invention, a reactive power coordination control method for a new energy station including a distributed phase modulation machine is provided, and this embodiment is illustrated by applying the method to a terminal, and it is to be understood that the method may also be applied to a server, and may also be applied to a system including a terminal and a server, and is implemented by interaction between the terminal and the server. The new energy power generation system in the embodiment includes, but is not limited to, a new energy station, a new energy collection station, and a reactive power regulating device thereof. In this embodiment, as shown in fig. 1 and fig. 2, the method includes the following steps:
1) determining a steady-state reactive power output range of the distributed phase modulator under different gears of a boost variable tap switch of the distributed phase modulator so as to determine the phase advancing/phase delaying capability of the distributed phase modulator;
2) considering the phase advancing/delaying capability and the steady-state operation mode of the distributed phase modulator, and selecting the gear of the boost variable tap switch of the distributed phase modulator;
3) and judging whether the communication between the local control AVC substation of the new energy field station and the AVC main station of the system is smooth or not, and performing coordination control on the steady-state reactive output of the reactive power regulation equipment containing the distributed phase modulator according to the judgment result.
In the step 1), the steady-state reactive power output of the distributed phase modulator under different gears of the boost variable tap switch of the distributed phase modulator is calculated respectively, and then the steady-state reactive power output range is determined. Wherein the steady state reactive power output of the distributed phase modulator
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Comprises the following steps:
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（1）
in the formula (I), the compound is shown in the specification,
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the voltage per unit value of the generator end of the distributed phase modulator is 0.925-1.075 in a steady state operation range;
Figure 333779DEST_PATH_IMAGE004
the voltage per unit value of the network side is obtained, and the steady-state operation range is 0.97-1.07;
Figure 901157DEST_PATH_IMAGE005
the voltage-rise admittance per unit value is the distributed phase modulator;
Figure 575852DEST_PATH_IMAGE006
is the per unit value of the transformation ratio of the step-up transformer,
Figure 99237DEST_PATH_IMAGE006
a value of 1 indicates operation in the nominal gear.
In the step 2), the method for selecting the step-up transformer tap changer gear of the distributed phase modulator by considering the phase advance/lag capability and the steady-state operation mode of the distributed phase modulator comprises the following steps:
2.1) selecting the reactive output of the distributed phase modulator to be +/-within the steady state voltage operation range of the terminal voltage of the distributed phase modulator and the steady state voltage operation range of the network side
Figure 214568DEST_PATH_IMAGE007
The gear position of the tap changer of the motor vehicle,
Figure 456193DEST_PATH_IMAGE007
rated capacity for a distributed phase modulator;
2.2) if a plurality of tap changer gears meeting the requirements appear, the safe operation and the system requirements of the distributed phase modulator are comprehensively considered, and then the corresponding tap changer gears are selected.
In the step 3), if the new energy field station locally controls the AVC substation to communicate smoothly with the system AVC main station, the method for performing coordination control on the steady-state reactive output of the reactive power regulation equipment comprising the distributed phase modulators comprises the following steps:
3.1) setting an AVC control submodule taking transient overvoltage control as a target, wherein the output result of the AVC control submodule is used as a constraint condition of a steady-state voltage control model in the automatic voltage control system;
and 3.2) sending an instruction to reactive power regulation equipment comprising a distributed phase modulator, a new energy source unit, power electronic type dynamic reactive power compensation equipment and a low-voltage capacitor by an automatic voltage control system, and comprehensively selecting a reactive power regulation equipment combination.
The AVC control submodule analyzes transient overvoltage response characteristics of different reactive power regulation equipment combinations under typical faults through transient overvoltage calculation according to the operation condition of new energy, response factors of all the reactive power regulation equipment to the transient overvoltage are obtained, and the reactive power regulation equipment combination capable of improving the transient voltage safety of a power grid after the faults is determined based on the response factors of all the elements to the transient overvoltage.
In this embodiment, preferably, the automatic voltage control system sends an instruction to the reactive power regulation device including the distributed phase modulator, the new energy unit, the power electronic dynamic reactive power compensation device, and the low-voltage capacitor, and comprehensively selects a combination of the reactive power regulation devices, specifically: the reactive power supply capability of the distributed phase modulator is preferentially used, the reactive power supply capability of the new energy source unit is secondly used, when the new energy source unit is in a large-scale generation and the system has insufficient reactive power, the power electronic type dynamic reactive power compensation equipment is then put into use, and finally the low-voltage capacitor is used.
In the step 3), if the communication between the new energy field station local control AVC sub-station and the AVC main station of the system is not smooth, the method for performing coordination control on the steady-state reactive power output of the reactive power regulation device comprising the distributed phase modulator comprises the following steps: and calculating reactive power output of the distributed phase modulator according to the active power output of the new energy, wherein the sum of the reactive power reference value of the distributed phase modulator and the reactive power output of other types of reactive equipment is equal to the reactive power loss collected by the new energy.
Examples
The method of the invention is further explained by taking the example that a new energy power generation system A matched with a certain direct current project in northwest performs reactive power coordinated operation control. The new energy power generation system A is connected to 1200MW photovoltaic, 5 330kV collecting transformers are configured in a collecting station, the capacity of each main transformer is 250MVA, the transformation ratio of the main transformers is 345 +/-8 x 1.25%/37kV, and the short-circuit impedance of the main transformers is 20%; each main transformer collects 240MW photovoltaic power generation, and meanwhile, 1 phase modulator of 50Mvar and 1 capacitor of 45Mvar are configured on the 35kV side of each main transformer. The short-circuit impedance of the step-up transformer of the distributed phase modulator is 11 percent, the rated capacity is 60MVA, and the step-up transformation ratio is 37 +/-2 multiplied by 2.50%/10.5 kV.
The steady-state reactive output capability of the distributed phase modulators is calculated according to the formula (1), and the steady-state reactive output capability of the 50Mvar distributed phase modulators in the new energy power generation system A is shown in figure 3. In the steady-state voltage operation range (35.89 kV-39.59 kV) of the system, the reactive power output of the distributed phase modulator is limited by two factors of the system voltage and the terminal voltage. As shown in fig. 3, when the boost transformation ratio is 1.025, the reactive power range of the phase modulator is between the third line (the terminal voltage is 1.075p.u. limited) and the fourth line (the terminal voltage is 0.925p.u. limited). If the reactive power needs to be increased in this range, the tap can be adjusted appropriately to increase the step-up conversion ratio (as shown by the line with the ratio of 1.05 r in fig. 3). And similarly, the reactive power of the phase modulator can be reduced by reducing the transformation ratio.
During steady-state operation, the hysteresis phase operating voltage of the distributed phase modulator cannot be higher than 11.2875kV, the phase-in operating voltage cannot be lower than 9.7125kV, and meanwhile, the actual steady-state operating voltage of the boost phase transformer of the distributed phase modulator is about 37 kV. In order to take phase advance capability and steady-state operation mode of the phase modulator into consideration, the boost variable of the distributed phase modulator is recommended to operate at 37.925kV, namely positive 1 gear (transformation ratio is 1.025) through simulation calculation.
Firstly, when the voltage of a high-voltage bus of the distributed phase modulator operates at the minimum steady-state operation voltage of 35.89kV and a rated gear (1) is adopted, the voltage is limited to the steady-state operation range of 9.7125-11.2875 kV of terminal voltage, and the steady-state reactive output capacity of the phase modulator is-23 Mvar-50 Mvar; when the gear 1 is positive (1.025), the steady-state reactive output range is-11 Mvar to 50 Mvar; when the gear is positive 2 (1.05), the steady-state reactive power output range is 1 Mvar-50 Mvar; and when the gear is minus 1 (0.975), the steady-state reactive output range is-35 Mvar to 47Mvar, and the rated phase-lag capacity cannot be ensured. Secondly, when the voltage of a high-voltage bus of the distributed phase modulator operates at the maximum steady-state operation voltage of 39.59kV and a rated gear (1) is adopted, the voltage is limited to the steady-state operation range of 9.7125-11.2875 kV of terminal voltage, and the steady-state reactive output capacity of the phase modulator is-50 Mvar-3 Mvar; when the gear 1 is positive (1.025), the steady-state reactive output range is-50 Mvar to 18 Mvar; and in the positive 2 gear (1.05), the steady-state reactive output range is-47 Mvar to 33Mvar, and the rated phase advance capacity cannot be ensured.
The rated gear and the positive 1 gear can meet the stable operation requirement of the distributed phase modulator at-50 Mvar to 50 Mvar. However, the steady state output range of the phase modifier is usually between the low in-phase output and the high in-phase output according to the system requirements. The safe operation and system requirements of the distributed phase modulator are comprehensively considered, the main requirement of the new energy collecting station on the distributed phase modulator is that the new energy collecting station has strong overvoltage suppression capability when the voltage of a boosting high-voltage bus is suddenly increased, and therefore a tap switch of the boosting phase modulator is selected to be in a positive 1 gear (37.925 kV) under the existing calculation parameters. The scheduling can be flexibly adjusted according to the actual system requirements and the operation parameters in operation.
The distributed phase modulators and the capacitors should reasonably adjust the operation mode according to the system requirements, particularly the power change of a new energy station, and meet the reactive power balance requirements. According to the calculation, the reactive power consumed by the new energy collection system is shown in fig. 4. Under the steady state condition of the new energy power generation system, the reactive power can be respectively generated through the distributed phase modulators, the low-voltage capacitors and the new energy station to enable the system to be in reactive power balance.
If the new energy field station locally controls the AVC substation to communicate smoothly with the system AVC main station, the system AVC system reasonably issues an instruction for switching the capacitor according to the new energy output and the system operation condition, and simultaneously issues a reactive power control instruction (an instruction for increasing or decreasing magnetism) of the distributed phase modulator. As shown in fig. 5 to 7, simulation calculation shows that the transient overvoltage level of the mode of 'distributed phase modulator large reactive power output + few throw capacitors' is slightly lower than that of the mode of 'priority new energy reactive power output' and the mode of 'distributed phase modulator small reactive power output + multiple throw low-voltage capacitors', and the effectiveness of the method is verified. According to simulation calculation, in steady-state operation, an AVC system can be used for sending instructions to the distributed phase modulators, the new energy sources and the low-capacity switching according to the operation condition of the new energy sources, the reactive power supply capability of the distributed phase modulators is preferentially used, the reactive power supply capability of the new energy sources is secondly used, and finally the low-voltage capacitors are used when the new energy sources are in heavy load and the system is insufficient in reactive power.
And if the communication between the local control AVC substation of the new energy field station and the system AVC main station is not smooth, independently controlling each group of 330kV transformers, and calculating the reactive power output of the distributed phase modulator according to the active power output of the new energy according to the step 3). When the active power is larger than 180MW, a low-voltage capacitor bank is put into use, when the active power is smaller than 160MW, the capacitor bank is cut off, and the sum of the reactive reference value of the distributed phase modulator and the reactive value of the capacitor is equal to the reactive loss collected by the new energy.
In conclusion, the step-up variable-speed tap switch gear of the distributed phase modulator is reasonably arranged, so that the reactive output capability of the distributed phase modulator is ensured, reactive balance of a new energy power generation system is ensured by coordinating various types of reactive power adjusting equipment, meanwhile, the transient overvoltage of a sending end system is effectively inhibited, reference can be provided for dispatching operation of an actual power grid, and the method has high practical value.
In one embodiment of the present invention, a reactive power coordination control system for a new energy power generation system including a distributed phase modulation machine is provided, which includes:
the first processing module is used for determining the steady-state reactive power output range of the distributed phase modulator under different gears of the boost variable tap switch of the distributed phase modulator so as to determine the phase advancing/phase delaying capability of the distributed phase modulator;
the second processing module is used for considering the phase advancing/delaying capability and the steady-state operation mode of the distributed phase modulator and selecting the gear of the boost variable-speed tap changer of the distributed phase modulator;
and the coordination control module is used for judging whether the communication between the local control AVC substation of the new energy field station and the AVC main station of the system is smooth or not and carrying out coordination control on the steady-state reactive output of the reactive power regulation equipment containing the distributed phase modulator according to the judgment result.
The system provided in this embodiment is used for executing the above method embodiments, and for specific flows and details, reference is made to the above embodiments, which are not described herein again.
In the computing device structure provided in an embodiment of the present invention, the computing device may be a terminal, and the computing device may include: a processor (processor), a communication Interface (communication Interface), a memory (memory), a display screen and an input device. The processor, the communication interface and the memory are communicated with each other through a communication bus. The processor is used to provide computing and control capabilities. The storage comprises a nonvolatile storage medium and an internal storage, wherein the nonvolatile storage medium stores an operating system and a computer program, and the computer program is executed by a processor to realize a reactive power coordination control method of a new energy station with a distributed phase modulation machine; the internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, a manager network, NFC (near field communication) or other technologies. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on a shell of the computing equipment, an external keyboard, a touch pad or a mouse and the like. The processor may call logic instructions in memory to perform the following method: determining a steady-state reactive power output range of the distributed phase modulator under different gears of a boost variable tap switch of the distributed phase modulator so as to determine the phase advancing/phase delaying capability of the distributed phase modulator; considering the phase advancing/delaying capability and the steady-state operation mode of the distributed phase modulator, and selecting the gear of the boost variable tap switch of the distributed phase modulator; and judging whether the communication between the local control AVC substation of the new energy field station and the AVC main station of the system is smooth or not, and performing coordination control on the steady-state reactive output of the reactive power regulation equipment containing the distributed phase modulator according to the judgment result.
In addition, the logic instructions in the memory may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Those skilled in the art will appreciate that the above-described configurations of computing devices are merely some of the configurations associated with the present application and do not constitute limitations on the computing devices to which the present application may be applied, as a particular computing device may include more or fewer components, or some components in combination, or have a different arrangement of components.
In one embodiment of the invention, a computer program product is provided, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, enable the computer to perform the methods provided by the above-described method embodiments, for example, comprising: determining a steady-state reactive power output range of the distributed phase modulator under different gears of a boost variable tap switch of the distributed phase modulator so as to determine the phase advancing/phase delaying capability of the distributed phase modulator; considering the phase advancing/phase delaying capability and the steady-state operation mode of the distributed phase modulator, and selecting the step-up transformer tap changer gear of the distributed phase modulator; and judging whether the communication between the local control AVC substation of the new energy field station and the AVC main station of the system is smooth or not, and performing coordination control on the steady-state reactive output of the reactive power regulation equipment containing the distributed phase modulator according to the judgment result.
In one embodiment of the invention, a non-transitory computer-readable storage medium is provided, which stores server instructions that cause a computer to perform the methods provided by the above embodiments, for example, including: determining a steady-state reactive power output range of the distributed phase modulator under different gears of a boost variable tap switch of the distributed phase modulator so as to determine the phase advancing/phase delaying capability of the distributed phase modulator; considering the phase advancing/phase delaying capability and the steady-state operation mode of the distributed phase modulator, and selecting the step-up transformer tap changer gear of the distributed phase modulator; and judging whether the communication between the local control AVC substation of the new energy field station and the AVC main station of the system is smooth or not, and performing coordination control on the steady-state reactive output of the reactive power regulation equipment containing the distributed phase modulator according to the judgment result.
The implementation principle and technical effect of the computer-readable storage medium provided by the above embodiments are similar to those of the above method embodiments, and are not described herein again.
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 examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A reactive power coordination control method for a new energy station with a distributed phase modulator is characterized by comprising the following steps:
determining a steady-state reactive power output range of the distributed phase modulator under different gears of a boost variable tap switch of the distributed phase modulator so as to determine the phase advancing/phase delaying capability of the distributed phase modulator;
considering the phase advancing/delaying capability and the steady-state operation mode of the distributed phase modulator, and selecting the gear of the boost variable-speed tap changer of the distributed phase modulator;
and judging whether the communication between the local control AVC substation of the new energy field station and the AVC main station of the system is smooth or not, and performing coordination control on the steady-state reactive output of the reactive power regulation equipment containing the distributed phase modulator according to the judgment result.
2. The method of claim 1 comprising distributing the keyThe reactive power coordination control method for the new energy station of the camera is characterized in that the steady-state reactive power output of the distributed phase modulator
Figure DEST_PATH_IMAGE001
Comprises the following steps:
Figure 544628DEST_PATH_IMAGE002
in the formula (I), the compound is shown in the specification,
Figure DEST_PATH_IMAGE003
the unit value of the terminal voltage of the distributed phase modulator;
Figure 461769DEST_PATH_IMAGE004
the voltage per unit value of the network side is obtained;
Figure 241506DEST_PATH_IMAGE005
the voltage-rise admittance per unit value is the distributed phase modulator;
Figure 249432DEST_PATH_IMAGE006
the transformation ratio per unit value of the step-up transformer.
3. The reactive power coordination control method for the new energy resource station with the distributed phase modulators as claimed in claim 1, wherein the method for selecting the step-up transformer tap changer of the distributed phase modulators considering the phase advance/lag capability and the steady-state operation mode of the distributed phase modulators comprises the following steps:
selecting the reactive output of the distributed phase modulator to be +/-within the stable voltage operation range of the terminal of the distributed phase modulator and the stable voltage operation range of the network side
Figure 63804DEST_PATH_IMAGE007
The gear position of the tap changer of the motor vehicle,
Figure 761633DEST_PATH_IMAGE007
rated capacity for a distributed phase modulator;
and if a plurality of tap changer gears meeting the requirements appear, comprehensively considering the safe operation and the system requirements of the distributed phase modulator, and further selecting the corresponding tap changer gears.
4. The reactive power coordination control method for the new energy station with the distributed phase modulator as claimed in claim 1, wherein the new energy station locally controls communication between an AVC sub-station and an AVC main station, and the method for coordination control of the steady-state reactive power output of the reactive power regulation equipment with the distributed phase modulator comprises the following steps:
setting an AVC control submodule taking transient overvoltage control as a target, wherein an output result of the AVC control submodule is used as a constraint condition of a steady-state voltage control model in an automatic voltage control system;
and sending an instruction to reactive power regulation equipment comprising the distributed phase modulator, the new energy source unit, the power electronic type dynamic reactive power compensation equipment and the low-voltage capacitor by the automatic voltage control system, and comprehensively selecting a reactive power regulation equipment combination.
5. The reactive power coordination control method for the new energy station with the distributed phase modulator according to claim 4, characterized in that the AVC control sub-module analyzes transient overvoltage response characteristics of different reactive power regulation equipment combinations under typical faults through transient overvoltage calculation according to new energy operation conditions to obtain response factors of each reactive power regulation equipment to the transient overvoltage, and determines the reactive power regulation equipment combination capable of improving the safety of the transient voltage of the power grid after the faults based on the response factors of each element to the transient overvoltage.
6. The reactive power coordinated control method of the new energy station comprising a distributed phase modulator according to claim 4, wherein the automatic voltage control system sends a command to the reactive power regulation equipment comprising the distributed phase modulator, the new energy unit, the power electronic type dynamic reactive power compensation equipment and the low-voltage capacitor, and the reactive power regulation equipment combination is selected comprehensively, comprising:
the reactive power supply capability of the distributed phase modulator is preferentially used, the reactive power supply capability of the new energy source unit is used, when the new energy source unit is in a large-scale generation and the system is insufficient in reactive power, power electronic type dynamic reactive power compensation equipment is used, and finally the low-voltage capacitor is used.
7. The reactive power coordination control method for the new energy station with the distributed phase modulator as claimed in claim 1, wherein the new energy station locally controls that the AVC sub-station is not communicated with the AVC main station, and the method for coordinating and controlling the steady-state reactive power output of the reactive power regulation equipment with the distributed phase modulator comprises the following steps:
and calculating reactive power output of the distributed phase modulator according to the active power output of the new energy, wherein the sum of the reactive power reference value of the distributed phase modulator and the reactive power output of other types of reactive equipment is equal to the reactive power loss collected by the new energy.
8. The utility model provides a new forms of energy power generation system reactive power coordinated control system who contains distributed phase modulation machine which characterized in that includes:
the first processing module is used for determining the steady-state reactive power output range of the distributed phase modulator under different gears of the boost variable tap switch of the distributed phase modulator so as to determine the phase advancing/phase delaying capability of the distributed phase modulator;
the second processing module is used for considering the phase advancing/lagging capacity and the steady-state operation mode of the distributed phase modulator and selecting the gear of the step-up transformer tap changer of the distributed phase modulator;
and the coordination control module is used for judging whether the communication between the local control AVC substation of the new energy field station and the AVC main station of the system is smooth or not and carrying out coordination control on the steady-state reactive output of the reactive power regulation equipment containing the distributed phase modulator according to the judgment result.
9. A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of the methods of claims 1-7.
10. A computing device, comprising: one or more processors, memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods of claims 1-7.
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