CN-122026411-A - Main distribution network voltage reactive power cooperative control method and system considering reactive power control performance

CN122026411ACN 122026411 ACN122026411 ACN 122026411ACN-122026411-A

Abstract

A method for controlling the voltage and reactive power of main distribution network in cooperation with consideration of reactive power control performance includes such steps as checking the voltage out-of-limit condition, judging if there is an out-of-limit condition, if it is, entering the voltage fluctuation stabilizing stage, carrying out the main distribution reactive power cooperative correction to main distribution network, if it is, entering the reactive power recombination stage, carrying out the main distribution reactive power replacement to main distribution network, and realizing the voltage and reactive power cooperative control to main distribution network. According to the invention, different control strategies are adopted according to the running state of the power grid, different priorities are set for the fast reactive power source and the slow reactive power source under different running states, and the voltage regulation and supporting functions of different types of reactive power sources can be more fully utilized.

Inventors

FANG YIBO
MIAO WUQIONG
SHI BONIAN
ZHAO FENGQING
WU YUSHENG
QIN JIAKAI
LAI XIAOMING
WU CHAO
ZOU DENGFENG
ZHOU XIN

Assignees

南京四方亿能电力自动化有限公司

Dates

Publication Date: 20260512
Application Date: 20251225

Claims (14)

1. The main distribution network voltage reactive power cooperative control method considering the reactive power control performance is characterized by comprising the following steps of: The voltage out-of-limit condition is checked, judging whether voltage out-of-limit exists or not; if the voltage is out of limit, entering a voltage fluctuation stabilizing stage, and carrying out main-distribution reactive power cooperative correction on a main-distribution network; if the voltage is not out of limit, entering a node reactive recombination stage, and carrying out main-distribution reactive power source replacement on a main-distribution network; and the voltage reactive power cooperative control of the main distribution network is realized through the main distribution reactive power cooperative correction or the main distribution reactive power source replacement.
2. The method for voltage reactive power cooperative control of a main distribution network taking into consideration reactive power control performance according to claim 1, wherein, The checking the voltage out-of-limit condition specifically comprises: Monitoring the voltage of each node in the distribution network, and if the node voltage exceeds a preset voltage limit value, indicating that the voltage out-of-limit exists; The monitoring nodes comprise buses of the ring main unit, a low-voltage side of a key user distribution transformer and positions on a feeder line, wherein voltage needs to be monitored.
3. The method for voltage reactive power cooperative control of a main distribution network taking into consideration reactive power control performance according to claim 1, wherein, The main-distribution reactive power cooperative correction for the main distribution network specifically comprises the following steps: Defining an empty list L1 for storing the control strategy of the round; calculating reactive compensation required by each node based on the sensitivity analysis calculation result and the out-of-limit analysis result; acquiring reactive power of each node, and obtaining a round of control strategy of each node by combining reactive power compensation required by each node; the round control strategy of each node is stored in a list L1, and the control strategy in the list L1 is executed.
4. The method for voltage reactive power cooperative control of a main distribution network taking into consideration reactive power control performance according to claim 3, wherein, The reactive compensation required by each node is calculated based on the sensitivity analysis calculation result and the out-of-limit analysis result, and the method specifically comprises the following steps: Wherein, the And Reactive power injection and voltage amplitude vector of the PQ node in the tide calculation equation; matrix composed of voltage-reactive sensitivity values of PQ nodes Elements of row j of row i Representing the reactive injection sensitivity of the voltage amplitude of the ith node to the jth node; For voltage deviation vector Reactive compensation required for it The method comprises the following steps: Wherein, the The number of nodes calculated for the power flow comprises nodes for detecting voltage in a feeder line, nodes with reactive power injection or load and branch bifurcation points.
5. The method for voltage reactive power cooperative control of a main distribution network taking into consideration reactive power control performance according to claim 3, wherein, The method for obtaining the reactive power of each node and obtaining the round of control strategy of each node by combining the reactive power compensation required by each node specifically comprises the following steps: Defining i as a node sequence number, and assigning i as 1; The reactive compensation adjustment requirement DeltaQi of the ith node is acquired, wherein the initial value of DeltaQi is reactive compensation The i-th element in the vector; Acquiring a reactive power list L2 of an ith node, wherein the number of reactive power sources in the reactive power list L2 is M, and sequencing according to the following priority order, namely a main network side fast reactive power source, a distribution network side fast reactive power source, a main network side slow reactive power source and a distribution network side slow reactive power source; defining j as a reactive power source serial number, and assigning j as 1; calculating reactive margin of jth reactive power supply in reactive power supply list L2 If Δqi >0, then If DeltaQi <0 Wherein, the method comprises the steps of, For the current adjustable reactive power, 、 Respectively a maximum adjustable reactive power and a minimum adjustable reactive power; Comparison of And Absolute value of (I) I is not less than I DeltaQi, the list L1 is filled with regulation strategy information { L2[ j ], deltaQi }, the reactive power output change DeltaQi of the jth reactive power supply in the reactive power supply list L2 is represented, otherwise { L2[ j ] is filled in the list L1, And the reactive power output change of the j-th reactive power source in the reactive power source list L2 is represented L2[ j ] represents the j-th reactive power supply in the reactive power supply list L2; If j is more than or equal to M or DeltaQi=0, continuously judging whether i is more than or equal to N, otherwise, returning to calculate the reactive margin of the j+1th reactive power supply in the reactive power supply list L2; If i is not less than N, ending the acquisition of the current round control strategy, obtaining a list L1 stored in the current round control strategy of each node, otherwise, returning to acquire the reactive compensation adjustment requirement DeltaQi+1 of the (i+1) th node.
6. The method for voltage reactive power cooperative control of a main distribution network taking into consideration reactive power control performance according to claim 1, wherein, The main distribution network is subjected to main distribution reactive power source replacement, and the method specifically comprises the following steps: Calculating the slow reactive margin of each gateway at the main network side: calculating the whole voltage level of the feeder line at the distribution network side, and uploading the rapid reactive margin data of the distribution network side to a main network; performing replacement condition analysis to judge whether the quick reactive power source at the distribution network side and the slow reactive power source at the main network side are required to be subjected to output replacement or not; when the replacement condition is met, checking the replacement condition at fixed intervals; and performing replacement operation on the main distribution network according to the satisfied replacement condition.
7. The method for voltage reactive power cooperative control of a main distribution network taking into account reactive power control performance according to claim 6, wherein, The calculating of the slow reactive margin of each gateway specifically comprises: Calculating the up-adjustable reactive power and the down-adjustable reactive power of the main network side slow reactive power source: Wherein, the Reactive power can be adjusted upwards for the main network side slow reactive power source, Reactive power can be adjusted downwards for the main network side slow reactive power source, The current reactive power output of the main network side slow reactive power source, And And the maximum reactive power output and the minimum reactive power output of the main network side slow reactive power source are obtained.
8. The method for voltage reactive power cooperative control of a main distribution network taking into account reactive power control performance according to claim 7, wherein, The distribution network side calculates the whole voltage level of the feeder line, the rapid reactive margin data of the distribution network side and sends the data to the main network, and the method specifically comprises the following steps: integral voltage level index of feeder line : Wherein, the Representing the voltage at the i-th node, Represents the reference value of the voltage, The number of nodes calculated for the tide; The rapid reactive margin data of the distribution network side comprises that the distribution network side can adjust reactive power upwards Reactive power of distribution network side capable of being adjusted downwards Tunable margin desired to be maintained on distribution network side Down-tunable margin desired to be maintained on distribution network side 。
9. The method for voltage reactive power cooperative control of a main distribution network taking into account reactive power control performance according to claim 8, wherein, The substitution conditions include: Substitution condition 1: Satisfy the following requirements During the process, performing capacitive reactive replacement; Wherein, the For a good upper bound for voltage operation in the feeder, The reactive reference value can be adjusted upwards for the main network side; Replacement condition 2: Satisfy the following requirements When in use, inductive reactive replacement is carried out; Wherein, the For a good lower bound of voltage operation in the feeder, And the reactive reference value can be adjusted downwards for the main network side.
10. The method for voltage reactive power cooperative control of a main distribution network taking into account reactive power control performance according to claim 9, wherein, The replacing operation for the main distribution network according to the satisfied replacing condition specifically comprises the following steps: When the replacement condition 1 is met, the whole voltage in the feeder line is higher, the reactive power up-regulation margin is smaller, the main network reactive power up-regulation margin is sufficient, the replacement operation comprises the steps of increasing the reactive power output of the main network side slow reactive power source and reducing the reactive power output of the distribution network side fast reactive power source.
11. When the replacement condition 2 is met, the overall voltage in the feeder line is low, the reactive power down-regulation margin is small, the main network reactive power down-regulation margin is sufficient, the replacement operation comprises the steps of reducing the reactive power output of the main network side slow reactive power source and increasing the reactive power output of the distribution network side fast reactive power source; If neither of the two replacement conditions is satisfied, no replacement operation is performed.
12. A main distribution network voltage reactive power cooperative control system taking reactive power control performance into consideration, for implementing the main distribution network voltage reactive power cooperative control method taking reactive power control performance into consideration according to any one of claims 1 to 10, comprising: the out-of-limit detection module is used for detecting the out-of-limit, for checking the voltage out-of-limit condition, judging whether voltage out-of-limit exists or not; the cooperative correction module is used for entering a voltage fluctuation stabilizing stage when the voltage is over the limit, and carrying out main-distribution reactive cooperative correction on the main distribution network; And the replacement module is used for entering a node reactive recombination stage when the voltage exceeding limit does not exist, and carrying out main-distribution reactive power source replacement on the main distribution network.
13. A terminal comprises a processor and a storage medium, and is characterized in that: The storage medium is used for storing instructions; The processor is configured to operate according to the instructions to perform the steps of the main distribution network voltage reactive cooperative control method according to any one of claims 1-10.
14. A computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor realizes the steps of the main distribution network voltage reactive cooperative control method according to any of claims 1-10.

Description

Main distribution network voltage reactive power cooperative control method and system considering reactive power control performance Technical Field The invention relates to the technical field of cooperative control of a main distribution network, in particular to a voltage and reactive cooperative control method and a system of the main distribution network, which consider the control performance of a reactive source. Background With the continuous improvement of the access ratio of new energy sources such as distributed photovoltaic and wind power in a power distribution system, the form and the operation mode of the power distribution system are changed. Due to the characteristics of high resistance/reactance ratio of network parameters and the fluctuation of new energy, the access of high-proportion new energy can cause the problems of voltage out-of-limit, unbalanced load rate and the like more frequently. In order to cope with the threat of large-scale new energy access to the safe and stable operation of the power grid, the traditional mode is to increase the configuration of capacitive and inductive reactive power at key nodes in each level of power grid, and implement coordinated control in the system through an on-site device according to a predefined on-site control strategy or through optimization calculation of scheduling master stations at all levels. However, if reactive power reserves of each level of power grid are increased without considering main-distribution coordination, the construction cost is too high, the utilization rate of adjustment resources is low, the optimization of the whole-grid power flow is difficult to achieve, and the whole-grid reactive power adjustment margin cannot be balanced. Therefore, a distribution automation system is needed to analyze distributed resources to obtain reactive power adjustability of each gateway, and a calculation result is sent to a main network through a communication interface, so that the main network can master the adjustability information of each feeder line to formulate a global optimization control strategy, and further, if the distribution network can sort and send adjustment margins of reactive power sources with different control performances, the main network can more fully consider the differences in the preparation strategy. In addition, in order to consider the voltage operation condition of the distribution network when the main network performs the main-distribution cooperative voltage reactive power control, the distribution network also transmits the overall voltage level and reactive margin requirements of each feeder line to the main network. The main-distribution cooperative reactive power control is introduced to the problems, and is a mode for jointly treating the voltage problems by utilizing the main network and the distribution network reactive power source. According to the main-distribution cooperative control method, the reactive power optimization problem of the main-distribution network is disassembled into three sub-problems, a model is built, and iterative calculation is adopted to realize cooperative optimization. The three sub-problem models are a main network reactive power optimization model, a distribution network reactive power optimization model and a boundary matching problem model respectively: (1) Solving the reactive power optimization model of the distribution network to obtain an equivalent power injection value of a gateway of the main distribution network, and sending the equivalent power injection value to the main network as input data of a reactive power optimization problem model of the main network; (2) Solving the reactive power optimization model of the main network to obtain the equivalent voltage amplitude and phase angle of the main distribution gateway port, and sending the equivalent voltage amplitude and phase angle to the distribution network as input data of the reactive power optimization model of the distribution network; (3) And judging whether the equivalent power injection value, the equivalent voltage amplitude and the phase angle at the main distribution gateway port, which are respectively obtained by the main distribution network reactive power optimization problem, meet the constraint of the boundary problem model, if so, completing the calculation, otherwise, updating the voltage and the reactive power value at the main distribution gateway port, and carrying out iterative calculation solution. However, the existing main-distribution cooperative control method has at least the following technical problems that only the voltage and reactive interaction problem at the main-distribution gateway port is considered in the prior art, and the control performance difference problem of different types of reactive sources in the distribution network is not further considered. In the novel power distribution system with a large amount of new energy connected, the reactive compen