CN112510747B - Method for selecting power adjustment time point of high-voltage direct current feed-in - Google Patents

Method for selecting power adjustment time point of high-voltage direct current feed-in Download PDF

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CN112510747B
CN112510747B CN202011356106.7A CN202011356106A CN112510747B CN 112510747 B CN112510747 B CN 112510747B CN 202011356106 A CN202011356106 A CN 202011356106A CN 112510747 B CN112510747 B CN 112510747B
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power
scheduling
sub
voltage direct
direct current
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CN112510747A (en
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廖长风
曹一家
谭益
矫舒美
陈远扬
李勇
曾子龙
郭思源
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a method for selecting a power adjustment time point of a high-voltage direct current feed-in, which comprises the following steps: step 1, dividing a scheduling period into a plurality of sub-scheduling periods, and determining internal loads of a receiving end power system, power parameters of a generator set and transmissible power data of a far-end power system in each sub-scheduling period; step 2, taking the maximum daily electric quantity of the high-voltage direct-current transmission feed-in receiving-end power system as an optimization target, wherein constraint conditions comprise the constraint of the size and the adjustment times of the direct-current feed-in power and the constraint of the consistency of the direct-current feed-in power-load change, and constructing a selection model of a power adjustment time point; and step 3, solving a selection model of the power adjustment time point, and solving whether the high-voltage direct current feed-in power is adjusted in each sub-scheduling time period. The invention solves the problem of integer variable caused by the limitation of the power adjustment times of the high-voltage direct current feed-in, and improves the solving efficiency of the day-ahead scheduling model of the receiving-end power system with the constraint of the power adjustment times of the high-voltage direct current converter station.

Description

Method for selecting power adjustment time point of high-voltage direct current feed-in
Technical Field
The invention belongs to the technical field of power dispatching, and particularly relates to a method for selecting a feed-in power regulation time point of a high-voltage direct-current converter station, in particular to a method for selecting a feed-in power regulation time point of a high-voltage direct-current converter station for multi-period dispatching of a power system at a receiving end.
Background
Since there are often serious inconsistencies in the regional distribution of energy supply and electricity load centers, experts and scholars in the field of electric power engineering have paid great attention to and have conducted intensive research on how to realize large-scale, long-distance delivery of electric power. The conventional hvdc transmission technology with large transmission capacity, low loss and high economic benefit is considered as one of effective and feasible solutions for solving the above problems, and reference is made to Dai Zhihui and the like for analysis of the principle and action policy of protecting the hvdc line. However, the large capacity of the high voltage dc feed power also creates some difficulties for the operation and control of the receiving power system. For example, to reduce the probability of system failure and the difficulty of dc power control, the operation schedule generally performs a forced constraint on the adjustment times of the feed power of the hvdc transmission in a certain period, and reference Zhang Yuan et al proposes a practical method for reactive power optimization of an ac/dc system, which takes into account the constraint on the daily adjustment times of the dc power. Therefore, it is necessary to consider the regulation times constraint of the feed power of the converter station in the optimization scheduling of the receiving electric power system with high voltage direct current feed. However, whether the power fed in by the converter station is adjusted to be a binary variable at a certain time point or not, and the discrete variable enables the day-ahead scheduling model of the power system of the receiving end to be a complex mixed integer optimization model, so that the solving difficulty of the optimal scheduling model of the power system of the receiving end is greatly increased.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the problem of integer variable caused by limitation of the adjustment times of the high-voltage direct current feed-in power is solved, a method for selecting the adjustment time point of the high-voltage direct current feed-in power for day-ahead scheduling of a receiving-end power system is provided, and the solving efficiency of a day-ahead scheduling model of the receiving-end power system with the constraint of the adjustment times of the high-voltage direct current converter station power is improved.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the method for selecting the power adjustment time point of the high-voltage direct current feed-in comprises the following steps:
step 1, dividing a scheduling period into a plurality of sub-scheduling periods uniformly, and determining internal load of a receiving end power system and transmissible power data of a far-end power system in each sub-scheduling period;
step 2, constructing a selection model of a power adjustment time point:
in the formula, the subscript i represents nodes of a receiving-end power system where the variable is located, and N represents the total number of nodes of the receiving-end power system; the subscript T represents the sub-scheduling time period in the scheduling period to which the variable belongs, and T represents the number of the sub-scheduling time periods included in the scheduling period;power fed to node i of the receiving power system for the sub-schedule period t for high voltage direct current,/->And->Is the minimum and maximum active power which can be transmitted by the HVDC transmission line due to the limit of the self capacity,/for the HVDC transmission line>Power is deliverable to a remote power system; z max Represents the maximum adjustable amount of the high-voltage direct-current power between two adjacent time periods, +.>Is 0-1 variable, ">Indicating that the high voltage DC feed power is regulated during the sub-schedule period t,/for the sub-schedule period t>The high-voltage direct current feed-in power is not regulated in the sub-scheduling time period t; />For the total active power of the internal load of the power system of the receiving end in the sub-scheduling time period t, N max The maximum adjustable times of the power of the high-voltage direct current feed-in receiving end power system in a scheduling period are obtained;
step 3, solving a selection model of the power adjustment time point to obtainAnd whether the high-voltage direct current feed-in power is adjusted in each sub-scheduling time period t is obtained.
Further, the scheduling period is 1 day.
Further, in step 1, the scheduling period is equally divided into 96 sub-scheduling periods.
Further, a professional optimization software GAMS is adopted to solve a selection model of the power adjustment time point.
Advantageous effects
The high-voltage direct current feed-in receiving end system power regulation time points obtained by the method ensure that the direct current feed-in power regulation can accord with the total load change characteristics of the receiving end power system and the fluctuation characteristics of the power which can be sent out by the sending end to a certain extent. Therefore, the method for selecting the day-ahead dispatching current-converting station feed-in power adjustment time point of the receiving-end power system is effective and feasible, can solve the problem of integer variable caused by the limitation of the high-voltage direct-current feed-in power adjustment times, and improves the solving efficiency of the day-ahead dispatching model of the receiving-end power system with the constraint of the high-voltage direct-current-converting station power adjustment times.
Drawings
FIG. 1 is a flow chart of a method according to the present embodiment;
fig. 2 is a graph showing the total load of the receiving end system and the power output of the transmitting end power grid in each time period in a scheduling period according to the present embodiment.
Detailed Description
The following describes in detail the embodiments of the present invention, which are developed based on the technical solution of the present invention, and provide detailed embodiments and specific operation procedures, and further explain the technical solution of the present invention.
In some cases, for the receiving-side power system, the price of electricity of the hvdc feed-in power is much lower than the price of electricity purchased by the receiving-side grid local power plant. Therefore, from the aspect of economy, the dispatching scheme of the receiving end power system containing the high-voltage direct current feed can purchase the high-voltage direct current feed power as much as possible. Based on the above, the invention provides a method for selecting a power adjustment time point of a high-voltage direct current feed, which aims to maximize the electric quantity of a power system fed into a receiving end of daily high-voltage direct current transmission, and constraint conditions comprise the constraint of the size and the adjustment times of the power fed into the direct current and the constraint of the consistency of the power-load change of the power fed into the direct current. Referring to fig. 1, the method specifically comprises the following steps:
step 1: taking one day as a scheduling period, equally dividing the scheduling period into 96 sub-scheduling periods, wherein each sub-scheduling period is 15 minutes, and then determining the internal load of a receiving end power system and the transmissible power of a far-end power system for each sub-scheduling period.
Step 2, constructing a selection model of a power adjustment time point:
in the formula, the subscript i represents nodes of a receiving-end power system where the variable is located, and N represents the total number of nodes of the receiving-end power system; the subscript T represents the sub-scheduling time period in the scheduling period to which the variable belongs, and T represents the number of the sub-scheduling time periods included in the scheduling period;power fed to node i of the receiving power system for the sub-schedule period t for high voltage direct current,/->And->Is the minimum and maximum active power which can be transmitted by the HVDC transmission line due to the limit of the self capacity,/for the HVDC transmission line>Power is deliverable to a remote power system; z max Representing the maximum adjustable amount of high-voltage direct-current power between two adjacent time periods，/>Is 0-1 variable, ">Indicating that the high voltage DC feed power is regulated during the sub-schedule period t,/for the sub-schedule period t>The high-voltage direct current feed-in power is not regulated in the sub-scheduling time period t; />For the total active power of the internal load of the power system of the receiving end in the sub-scheduling time period t, N max The maximum adjustable times of the power of the high-voltage direct current feed-in receiving end system in a scheduling period are obtained;
equation (2) limits the operation constraint of the power of the high-voltage direct current feed-in receiving end system, and the power of the high-voltage direct current feed-in receiving end system is limited by the capacity of the high-voltage direct current transmission line and the transmissible power of the far-end power system
Equation (3) is an inequality constraint that limits the number of times the power of the high voltage dc feed-in receiver system can be adjusted. The HVDC system can be only realized in the following formula (3)The feed-in power is adjusted at the time, and the size of the feed-in power adjustment is not more than z max Thereby ensuring that the sum of the adjustment times of the high-voltage direct current feed-in power does not exceed the maximum adjustment times N max ；
The formula (4) is a constraint of consistency of direct current feed-in power-load change, and can enable the adjustment direction of high-voltage direct current feed-in power to be consistent with the fluctuation direction of total load in a receiving end system as much as possible, so that the active adjustment pressure of high-cost equipment such as a thermal power unit and energy storage in the system can be reduced.
Step 3, solving a selection model of a power adjustment time point by adopting professional optimization software GAMS to obtainAnd whether the high-voltage direct current feed-in power is adjusted in each sub-scheduling time period t is obtained.
In order to verify the effectiveness of the technical scheme of the invention, a certain assumed system is simulated to verify the effectiveness of the improved voltage direct current power adjustment time point selection method. Daily load of the receiving end systemAnd daily deliverable power of power grid at transmitting endAs shown in fig. 2. The maximum total load and the minimum total load of the receiving end system are 3236MW and 2340WM respectively; the maximum transmissible power and the minimum transmissible power of the remote transmitting end system are respectively 1156MW, 402MW and +.>z max Set to 1000MW, 0MW, 500MW, respectively. The reference capacity was 100MVA. The time node for regulating the power of the high-voltage direct current feed-in receiving end system created by the invention is shown in table 1.
TABLE 1
As can be seen from the simultaneous analysis of the results in table 1 and fig. 2, the time points for adjusting the power of the high-voltage direct current feed-in receiving end system obtained by the method of the invention ensure that the adjustment of the direct current feed-in power can be in a certain degree with the overall load change characteristic of the receiving end system and the fluctuation characteristic of the power which can be sent out by the sending end. Therefore, the method for selecting the feed power adjustment time point of the day-ahead dispatching converter station of the receiving end power system is effective and feasible.
The above embodiments are preferred embodiments of the present application, and various changes or modifications may be made on the basis thereof by those skilled in the art, and such changes or modifications should be included within the scope of the present application without departing from the general inventive concept.

Claims (3)

1. The method for selecting the power adjustment time point of the high-voltage direct current feed-in is characterized by comprising the following steps of:
step 1, dividing a scheduling period into 96 sub-scheduling periods equally, and determining internal load of a receiving end power system and transmissible power data of a far-end power system in each sub-scheduling period;
step 2, constructing a selection model of a power adjustment time point:
in the formula, the subscript i represents nodes of a receiving-end power system where the variable is located, and N represents the total number of nodes of the receiving-end power system; the subscript T represents the sub-scheduling time period in the scheduling period to which the variable belongs, and T represents the number of the sub-scheduling time periods included in the scheduling period;feeding high-voltage direct current to node i of the receiving power system in sub-scheduling period tPower (I)>And->Is the minimum and maximum active power which can be transmitted by the HVDC transmission line due to the limit of the self capacity,/for the HVDC transmission line>Power is deliverable to a remote power system; z max Represents the maximum adjustable amount of the high-voltage direct-current power between two adjacent time periods, +.>Is a variable which is 0 to 1,indicating that the high voltage DC feed power is regulated during the sub-schedule period t,/for the sub-schedule period t>The high-voltage direct current feed-in power is not regulated in the sub-scheduling time period t; p (P) t load For the total active power of the internal load of the power system of the receiving end in the sub-scheduling time period t, N max The maximum adjustable times of the power of the high-voltage direct current feed-in receiving end system in a scheduling period are obtained;
step 3, solving a selection model of the power adjustment time point to obtainAnd whether the high-voltage direct current feed-in power is adjusted in each sub-scheduling time period t is obtained.
2. The method of claim 1, wherein the scheduling period is 1 day.
3. The method of claim 1, wherein the selection model for the power adjustment time point is solved by using a professional optimization software GAMS.
CN202011356106.7A 2020-11-27 2020-11-27 Method for selecting power adjustment time point of high-voltage direct current feed-in Active CN112510747B (en)

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