CN109066824B - Flexible balance control method for active power distribution network load - Google Patents

Flexible balance control method for active power distribution network load Download PDF

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CN109066824B
CN109066824B CN201811085027.XA CN201811085027A CN109066824B CN 109066824 B CN109066824 B CN 109066824B CN 201811085027 A CN201811085027 A CN 201811085027A CN 109066824 B CN109066824 B CN 109066824B
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limit
alternating current
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CN109066824A (en
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薛忠
陈根军
张代新
顾全
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Engineering 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
    • H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks

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Abstract

The invention provides a load flexible balance control method for an active power distribution network. The method comprises the following steps: the active power distribution network is provided with multi-port flexible switch equipment which is connected with loads on a direct current side and an alternating current side; acquiring power data of an alternating current side and a direct current side which are connected with the multi-port flexible switch equipment; calculating a regulated power of the multi-port flexible switching device based on the power data; and sending a command to a control device to adjust the power of the alternating current port and the direct current side of the multi-port flexible switch device. According to the invention, the multi-port flexible switch device is connected with the alternating current feeders and the direct current lines with different voltage grades, so that the power supply capacity of the high-voltage-grade feeders and the mutual supporting effect of the flexible switch on the connected feeders are fully exerted, the main station is used for carrying out acquisition, analysis and calculation, and the flexible switch device is used for accurately adjusting the power of the alternating current port, thereby realizing the load balance of the feeders and improving the safety, stability and flexibility of the power distribution network.

Description

Flexible balance control method for active power distribution network load
Technical Field
The invention relates to the technical field of power system automation, in particular to a load flexible balance control method for an active power distribution network.
Background
The power distribution network is the final bridge from the production of electric energy to users, and is an extremely important link in the power system. Because the traditional closed-loop operation of the power distribution network has the problems of electromagnetic looped network, circulating power, short-circuit electricity increase, accident range expansion and the like, an open-loop operation mode is generally adopted.
The inventor finds that the open-loop operation mode has the problems of low equipment utilization rate, low power supply reliability, lack of mutual support among different feeders, areas and voltage levels and the like. The traditional power distribution network load balancing mainly depends on a network reconstruction means, but the network reconstruction based on the segmentation and interconnection switches is restricted, the problems of action life, response speed, impact current and the like of the switches cannot be solved, the power flow cannot be accurately controlled, and the adjusting effect is limited.
Disclosure of Invention
The embodiment of the invention aims to provide a flexible load balancing control method for an active power distribution network, which is characterized in that a multi-port flexible switch device is connected with alternating current feeders and direct current lines with different voltage grades, the power supply capacity of the high-voltage-grade feeders and the mutual supporting effect of the flexible switch on the connected feeders are fully exerted, the power flowing through the flexible switch device is adjusted, the balancing of feeder load distribution is promoted, and the technical problem is solved.
The embodiment of the invention provides a load flexible balance control method for an active power distribution network, which comprises the following steps:
the active power distribution network is provided with multi-port flexible switch equipment which is connected with a direct current side and an alternating current side;
acquiring power data of an alternating current side and a direct current side which are connected with the multi-port flexible switch equipment;
calculating a load regulation power of the multi-port flexible switching device based on the power data;
and sending a command to a control device to adjust the load power of the alternating current port and the direct current side of the multi-port flexible switch device.
Further, the active power distribution network configuration multi-port flexible switch device is connected with a direct current side and an alternating current side, and comprises:
the active power distribution network is provided with an alternating current port of the multi-port flexible switch equipment connected with the alternating current side, and a direct current port connected with the direct current side; the number of the alternating current ports is two or more, and the alternating current side comprises feeders with different voltage levels; the number of the direct current ports is one or more, and the direct current side comprises a distributed power supply, an energy storage and a flexible load.
Further, one and only one of the ac ports operates in a voltage control mode, and the remaining ac ports operate in a power control mode.
Further, the collecting power data of the ac side and the dc side connected to the multi-port flexible switch device includes:
the active power distribution network acquires an active power value connected to the head end of the feeder line;
obtaining active power of the alternating current port;
acquiring the power of the direct current port;
and newly adding injection power to the direct current port by acquiring the distributed power supply, the energy storage and the flexible load.
Further, the calculating a load regulation power of the multi-port flexible switching device based on the power data includes:
calculating total power needing to be balanced among alternating current ports of the multi-port flexible switch equipment, active adjustment quantity of each alternating current port and an active power expected value based on the power data;
and checking and processing the active power expected value in an out-of-limit way.
Further, the calculating, based on the power data, a total power to be balanced among the ac ports of the multi-port flexible switch device, an active adjustment amount of each ac port, and an expected active power value includes:
calculating the total power needing to be balanced among the alternating current ports based on the power data:
Figure GDA0003103839450000031
in the formula, LlFor the total power to be balanced between the AC ports, LiIs the active power value, delta P, of the head end of the AC feeder linedIncreasing injection power at the direct current port;
calculating the expected power of each AC feeder according to the rated capacity of the AC feeders:
Figure GDA0003103839450000032
wherein L isiexpFor the desired power of the AC feeder, SNiIs the rated capacity of the ac feeder i;
calculating the active adjustment quantity of each alternating current port and the active power expected value of each alternating current port:
ΔPi＝Liexp-Li，
Piexp＝Pi+ΔPi，
in the formula,. DELTA.PiFor active regulation of the AC port, LiexpFor desired power of the AC feeder, LiIs the active power value, P, of the head end of the AC feeder lineiexpFor the desired value of active power, P, of the AC portiIs the active power of the ac port.
Further, the performing out-of-limit checking and processing on the expected value of active power includes:
checking whether the expected value of the active power exceeds the limit or not;
and carrying out-of-limit processing on the out-of-limit active power expected value.
Further, the performing the out-of-limit processing on the out-of-limit active power expected value includes:
accumulating the more limited expected values of the alternating current ports with the negative and out-of-limit expected values to obtain more limited negative expected values;
accumulating the more limited expected values of the alternating current ports with the expected values being positive and out of limit to obtain the more limited expected values;
comparing the magnitude of the negative expected value override amount and the positive expected value override amount;
processing is performed based on the comparison result.
Further, the processing based on the comparison result includes:
if the negative desired value override amount is greater than the positive desired value override amount, then:
setting the expected values of all the AC ports with the expected values being negative and out-of-limit as limit values, and reducing the expected values of the AC ports with the expected values being positive according to the feeder line capacity proportion through energy conservation;
judging whether an alternating current port with a positive expected value has an out-of-limit condition, if not, updating the power adjustment quantity of the related alternating current port; if so, setting the expected values of all the AC ports with the expected power being positive and out of limit as limit values, reducing the absolute value of the expected value of the AC port with the expected value being negative and not reaching the limit value according to the capacity proportion of the feeder line according to the conservation of energy, and updating the power adjustment quantity of the relevant AC port;
if the negative desired value override amount is less than the positive desired value override amount:
setting the expected values of all the AC ports with the expected values being positive and out-of-limit as limit values, and reducing the absolute value of the expected value of the AC port with the expected value being negative according to the comparison of the feeder line capacity by energy conservation;
judging whether the AC ports with the expected values being negative have the out-of-limit condition, if not, updating the power adjustment quantity of the relevant AC ports, if so, setting the expected values of all the AC ports with the expected powers being negative and out-of-limit as limit values, and according to energy conservation, reducing the expected values of the AC ports with the expected values being positive and not reaching the limit values according to the comparison of the feeder line capacity, and updating the power adjustment quantity of the relevant AC ports;
and if the negative expected value out-of-limit quantity is equal to the positive expected value out-of-limit quantity, setting the expected values of all the alternating current ports with out-of-limit expected values as limit values, and updating the related port power adjustment quantity.
Further, the sending a command to a control device to perform load power adjustment on an ac port and a dc side of the multi-port flexible switch device includes:
sending a command to the control equipment to adjust active adjustment quantities of other alternating current ports except the constant voltage control alternating current port;
and sending commands to a control device to adjust the power of the distributed power supply, the energy storage and the flexible load.
According to the technical scheme provided by the embodiment of the invention, the multi-port flexible switch equipment is connected with the alternating current feeders and the direct current lines with different voltage grades, the power supply capacity of the high-voltage-grade feeders and the mutual supporting effect of the flexible switch on the connected feeders are fully exerted, the main station is used for collecting, analyzing and calculating, and the flexible switch equipment is used for accurately adjusting the power of the current ports, so that the load balance of the feeders is realized, the problems of power supply interruption, loop closing impact, poor control accuracy and the like caused by the traditional interconnection switch back-off operation are solved, the customized power requirements of distributed power supply absorption, high power supply reliability and the like are met, and the safety, the stability and the flexibility of the power distribution network are improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a load flexibility balancing control method for an active power distribution network according to an embodiment of the present invention;
FIG. 2 is a schematic main wiring diagram of a multi-port flex switch according to an embodiment of the present invention;
fig. 3 is a flowchart of a load flexibility balancing control method for an active power distribution network according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, specific embodiments of the technical solutions of the present invention will be described in more detail and clearly with reference to the accompanying drawings and the embodiments. However, the specific embodiments and examples described below are for illustrative purposes only and are not limiting of the invention. It is intended that the present invention cover only some embodiments of the invention and not all embodiments of the invention, and that other embodiments obtained by various modifications of the invention by those skilled in the art are intended to be within the scope of the invention.
Fig. 1 is a schematic flow chart of a load flexibility balancing control method for an active power distribution network according to an embodiment of the present invention, where the method includes the following steps.
In step S110, a multi-port flexible switch device is configured in the active power distribution network to connect the dc side and the ac side.
Fig. 2 is a schematic main wiring diagram of a multi-port flexible switch according to an embodiment of the present invention. As shown in fig. 2, the active distribution network is configured with a multi-port flexible switching device. The multi-port flexible switch device is provided with n alternating current ports and m direct current ports, wherein n is more than or equal to 2, and m is more than or equal to 1.
The alternating current port is connected with the alternating current side, the alternating current side comprises feeders with different voltage grades, only one of the alternating current ports operates in a voltage control mode, and the other alternating current ports operate in a power control mode. The direct current port is connected with a direct current side, and the direct current side comprises a distributed power supply, an energy storage and a flexible load.
In step S120, power data of the ac side and the dc side connected to the multi-port flexible switch device are collected.
The active power distribution network main station acquires active power values L1, L2 and … Ln connected to the head end of an alternating current feeder line of the multi-port flexible switch, and the direction of the head end of the feeder line flowing to the tail end is taken as the positive direction. Active power P1, P2 and … Pn of each alternating current port of the flexible switch are obtained, and the direction of flowing into the flexible switch is taken as the positive direction. And acquiring power Pd1, Pd2 and … Pdm of each direct current port of the flexible switch. The newly added injection power delta P can be obtained from the distributed power supply, the energy storage and the flexible load in each direct current port to the direct current portd. Here, the regulation economy and the dc port power constraints are considered together.
In step S130, a load regulation power of the multi-port flexible switching device is calculated based on the power data.
And calculating the total power to be balanced among the alternating current ports of the multi-port flexible switch equipment, the active adjustment quantity of each alternating current port and the expected value of the active power based on the power data. And the active power expected value is checked and processed in an out-of-limit way.
In step S140, a command is sent to the control device to perform load power adjustment on the ac port and the dc side of the multi-port flexible switching device.
And the master station of the active power distribution network sends a command to the control equipment of the multi-port flexible switch equipment to adjust the active power of other alternating current ports except the constant-voltage control alternating current port. And simultaneously sending commands to the distributed power supply, the energy storage and the flexible load on the direct current side to adjust the probability.
Fig. 3 is a flowchart of a load flexibility balancing control method for an active power distribution network according to another embodiment of the present invention. As shown in fig. 3, the flow chart shows the implementation flow of the above method in more detail.
In step S210, a multi-port flexible switch device is configured in the active power distribution network to connect the dc side and the ac side.
Fig. 2 is a schematic main wiring diagram of a multi-port flexible switch according to an embodiment of the present invention. As shown in fig. 2, the active distribution network is configured with a multi-port flexible switching device. The multi-port flexible switch device is provided with n alternating current ports and m direct current ports, wherein n is more than or equal to 2, and m is more than or equal to 1.
The alternating current port is connected with the alternating current side, the alternating current side comprises feeders with different voltage grades, only one of the alternating current ports operates in a voltage control mode, and the other alternating current ports operate in a power control mode. The direct current port is connected with a direct current side, and the direct current side comprises a distributed power supply, an energy storage and a flexible load.
Step S220, collecting power data of an alternating current side and a direct current side which are connected with the multi-port flexible switch equipment. Step S220 includes substeps S221, S222, S223, S224.
In step S221, the active distribution network master station obtains active power values L1, L2, … Ln of the head end of the ac feeder line connected to the multi-port flexible switch, and the direction in which the head end of the feeder line flows to the tail end is taken as the positive direction.
In step S222, the active power P1, P2, … Pn of each ac port of the flexible switch is obtained, and the direction of the current flowing into the flexible switch is taken as the positive direction.
In step S223, the dc port powers Pd1, Pd2, … Pdm of the flexible switches are obtained.
In step S224, the distributed power source, the stored energy and the flexible load in each dc port are obtained, and the injection power Δ P can be added to the dc portd. Here, the regulation economy and the dc port power constraints are considered together.
Step S230, calculating a load regulation power of the multi-port flexible switch device based on the power data. Step S230 includes substeps S231, S232.
In step S231, a total power to be balanced among the ac ports of the multi-port flexible switch device, an active adjustment amount of each ac port, and an expected active power value are calculated based on the power data.
And calculating the total power needing to be balanced among the alternating current ports based on the power data. The calculation formula is as follows.
Figure GDA0003103839450000081
In the formula, LlFor the total power to be balanced between the AC ports, LiIs the active power value, delta P, of the head end of the AC feeder linedThe newly added injection power of the direct current port.
And the active power distribution main station calculates the expected power of each alternating current feeder according to the rated capacity of the alternating current feeder.
Figure GDA0003103839450000082
Wherein L isiexpFor the desired power of the AC feeder, SNiIs the rated capacity of the ac feeder i,
and calculating the active adjustment quantity of each alternating current port and the expected active power value of each alternating current port.
ΔPi＝Liexp-Li；
Piexp＝Pi+ΔPi。
In the formula,. DELTA.PiFor active regulation of the AC port, LiexpFor desired power of the AC feeder, LiIs the active power value, P, of the head end of the AC feeder lineiexpFor the desired value of active power, P, of the AC portiIs the active power of the ac port.
And step S232, performing out-of-limit checking and processing on the expected value of the active power. Step S232 includes substeps S2321, S2322.
In step S2321, it is checked whether the expected value of active power is out of limit.
If not, the process proceeds directly to step S240. If the limit is out of limit, the process proceeds to step S2322.
Step S2322, performing out-of-limit processing on the out-of-limit active power expected value. Step S2322 includes substeps S23221, S23222, S23223, S23224.
In step S23221, the expected value limit amounts of the ac ports whose expected values are negative and are out of limit are accumulated to obtain negative expected value limit amounts.
In step S23222, the expected value limit amounts of the ac ports whose expected values are positive and are out of limit are accumulated to obtain a positive expected value limit amount.
In step S23223, the magnitude of the negative expected value override amount and the positive expected value override amount are compared.
In step S23224, processing is performed based on the comparison result.
And if the negative expected value overrun amount is larger than the positive expected value overrun amount, setting the expected values of all the AC ports with the expected values being negative and overrun as limit values, and reducing the expected value of the AC port with the expected value being positive according to the feeder capacity proportion by energy conservation. Judging whether the AC port with the positive expected value has the out-of-limit condition, if not, updating the power adjustment quantity of the relevant AC port; if the expected values of the AC ports are positive and out of limit, setting the expected values of all the AC ports with the expected power being positive as limit values, reducing the absolute value of the expected value of the AC port with the expected value being negative and not reaching the limit value according to the feeder line capacity proportion according to the conservation of energy, and updating the power adjustment quantity of the relevant AC port.
And if the negative expected value overrun amount is smaller than the positive expected value overrun amount, setting the expected values of all the AC ports with the expected values being positive and overrun as limit values, and reducing the absolute value of the expected value of the AC port with the expected value being negative according to the comparison of the feeder capacity by energy conservation. And then judging whether the AC ports with the expected values being negative exist the out-of-limit condition, if not, updating the power adjustment quantity of the relevant AC ports, if so, setting the expected values of all the AC ports with the expected powers being negative and out-of-limit as limit values, and according to energy conservation, reducing the expected values of the AC ports with the expected values being positive and not reaching the limit values according to the comparison of the feeder line capacity, and updating the power adjustment quantity of the relevant AC ports.
And if the more negative expected value quantity is equal to the more positive expected value quantity, setting the expected values of all the AC ports with the more negative expected values as limit values, and updating the power adjustment quantity of the relevant ports.
In step S240, a command is sent to the control device to perform load power adjustment on the ac port and the dc side of the multi-port flexible switching device.
And the master station of the active power distribution network sends a command to the control equipment of the multi-port flexible switch equipment to adjust the active power of other alternating current ports except the constant-voltage control alternating current port. And simultaneously sending commands to the distributed power supply, the energy storage and the flexible load on the direct current side to adjust the probability.
It should be noted that the above-mentioned embodiments described with reference to the drawings are only intended to illustrate the present invention and not to limit the scope of the present invention, and it should be understood by those skilled in the art that modifications and equivalent substitutions can be made without departing from the spirit and scope of the present invention. Furthermore, unless the context indicates otherwise, words that appear in the singular include the plural and vice versa. Additionally, all or a portion of any embodiment may be utilized with all or a portion of any other embodiment, unless stated otherwise.

Claims (8)

1. A load flexibility balancing control method for an active power distribution network comprises the following steps:
the active power distribution network is provided with multi-port flexible switch equipment which is connected with an alternating current side and a direct current side;
acquiring power data of an alternating current side and a direct current side which are connected with the multi-port flexible switch equipment;
calculating a load regulation power of the multi-port flexible switching device based on the power data;
sending a command to a control device to perform load power adjustment of an ac port and a dc side of the multi-port flexible switching device, wherein the calculating the load adjustment power of the multi-port flexible switching device based on the power data comprises:
calculating total power needing to be balanced among alternating current ports of the multi-port flexible switch equipment, active adjustment quantity of each alternating current port and an active power expected value based on the power data;
checking and processing the active power expected value in an out-of-limit way;
wherein the calculating of the total power to be balanced among the ac ports of the multi-port flexible switch device, the active adjustment amount of each ac port, and the expected value of the active power based on the power data includes:
calculating the total power needing to be balanced among the alternating current ports based on the power data:
Figure FDA0003236809010000011
in the formula, LlFor the total power to be balanced between the AC ports, LiIs the active power value, delta P, of the head end of the AC feeder linedIncreasing injection power at the direct current port;
calculating the expected power of each AC feeder according to the rated capacity of the AC feeders:
Figure FDA0003236809010000012
wherein L isiexpFor the desired power of the AC feeder, SNiIs the rated capacity of the ac feeder i;
calculating the active adjustment quantity of each alternating current port and the active power expected value of each alternating current port:
ΔPi＝Liexp-Li，
Piexp＝Pi+ΔPi，
in the formula,. DELTA.PiFor active regulation of the AC port, LiexpFor desired power of the AC feeder, LiIs the active power value, P, of the head end of the AC feeder lineiexpFor the desired value of active power, P, of the AC portiIs the active power of the ac port.
2. The method of claim 1, wherein configuring the multi-port flexible switching device for the active distribution network to connect a direct current side and an alternating current side comprises:
the active power distribution network is provided with an alternating current port of the multi-port flexible switch equipment connected with the alternating current side, and a direct current port connected with the direct current side; the number of the alternating current ports is two or more, and the alternating current side comprises feeders with different voltage levels; the number of the direct current ports is one or more, and the direct current side comprises a distributed power supply, an energy storage and a flexible load.
3. The method of claim 2, wherein one and only one of the ac ports is operating in a voltage control mode and the remaining ac ports are operating in a power control mode.
4. The method of claim 3, wherein the collecting power data for the AC side and the DC side of the multi-port flexible switching device connection comprises:
the active power distribution network acquires an active power value connected to the head end of the feeder line;
obtaining active power of the alternating current port;
acquiring the power of the direct current port;
and newly adding injection power to the direct current port by acquiring the distributed power supply, the energy storage and the flexible load.
5. The method according to claim 1, wherein the checking and processing the expected active power value for out-of-limit includes:
checking whether the expected value of the active power exceeds the limit or not;
and carrying out-of-limit processing on the out-of-limit active power expected value.
6. The method of claim 5, wherein the out-of-limit processing the out-of-limit active power expected value comprises:
accumulating the more limited expected values of the alternating current ports with the negative and out-of-limit expected values to obtain more limited negative expected values;
accumulating the more limited expected values of the alternating current ports with the expected values being positive and out of limit to obtain the more limited expected values;
comparing the magnitude of the negative expected value override amount and the positive expected value override amount;
processing is performed based on the comparison result.
7. The method of claim 6, wherein the processing based on the comparison comprises:
if the negative desired value override amount is greater than the positive desired value override amount, then:
setting the expected values of all the AC ports with the expected values being negative and out-of-limit as limit values, and reducing the expected values of the AC ports with the expected values being positive according to the capacity proportion of the feeder line by energy conservation;
judging whether an alternating current port with a positive expected value has an out-of-limit condition, if not, updating the power adjustment quantity of the related alternating current port; if so, setting the expected values of all the AC ports with the expected power being positive and out of limit as limit values, reducing the absolute value of the expected value of the AC port with the expected value being negative and not reaching the limit value according to the capacity proportion of the feeder line according to the conservation of energy, and updating the power adjustment quantity of the relevant AC port;
if the negative desired value override amount is less than the positive desired value override amount:
setting the expected values of all the AC ports with the expected values being positive and out-of-limit as limit values, and reducing the absolute value of the expected value of the AC port with the expected value being negative according to the comparison of the feeder line capacity by energy conservation;
judging whether the AC ports with the expected values being negative have the out-of-limit condition, if not, updating the power adjustment quantity of the relevant AC ports, if so, setting the expected values of all the AC ports with the expected powers being negative and out-of-limit as limit values, and according to energy conservation, reducing the expected values of the AC ports with the expected values being positive and not reaching the limit values according to the comparison of the feeder line capacity, and updating the power adjustment quantity of the relevant AC ports;
and if the negative expected value out-of-limit quantity is equal to the positive expected value out-of-limit quantity, setting the expected values of all the alternating current ports with out-of-limit expected values as limit values, and updating the related port power adjustment quantity.
8. The method of claim 1, wherein sending commands to a control device for load power regulation on the ac port and dc side of a multi-port flexible switching device comprises:
sending a command to the control equipment to adjust active adjustment quantities of other alternating current ports except the constant voltage control alternating current port;
and sending commands to a control device to adjust the power of the distributed power supply, the energy storage and the flexible load.
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