Three-phase medium-low voltage integrated power distribution network voltage control method and system

A voltage control method and technology of low-voltage distribution network, which are applied in the direction of AC network voltage adjustment, electrical components, circuit devices, etc., can solve the problems of three-phase imbalance, equipment life loss, and difficulty in unified control of medium and low-voltage distribution networks. , to achieve the effect of improving operating efficiency, improving accuracy, and improving operating safety

Active Publication Date: 2020-02-21
国网山东省电力公司聊城供电公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still a series of problems in the emergence of the above power distribution forms: (1) There is no effective medium and low voltage integrated control model established, and the flexible operation control strategy is missing; (2) The access of distributed power makes a single network load characteristics developed into complex network source load characteristics
However, with the access of distributed power, especially the continuous integration of distributed power into the low-voltage distribution network through inverters, traditional reactive power compensation equipment is no longer sufficient to deal with the randomness and volatility brough

Method used

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  • Three-phase medium-low voltage integrated power distribution network voltage control method and system

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Example Embodiment

[0065] Example 1:

[0066] Such as figure 1 As shown, Embodiment 1 of the present disclosure provides a three-phase medium and low voltage integrated distribution network voltage control method. First, read the original data of the distribution network, enter the distribution network parameters, photovoltaic parameters, and establish the probability of distributed power output and load The model uses a two-point estimation method to solve the problem of probabilistic power flow. In view of the uncertainty of distributed power access and load, considering the three-phase imbalance of the distribution network, a voltage control model of active power loss, voltage offset, and three-phase imbalance is established. Finally, a multi-objective weighting Genetic algorithm to solve the solution of the model.

[0067] The basic steps are:

[0068] Step (1): Read the original data of the distribution network, including the given value parameters of the load, the parameters of photovoltaic po...

Example Embodiment

[0180] Example 2:

[0181] Embodiment 2 of the present disclosure provides a three-phase middle and low voltage integrated distribution network voltage control system, including:

[0182] The probability model building module is configured to read the original data of the distribution network and establish the uncertainty probability model of the distributed power output and load;

[0183] The power flow calculation module is configured to: use the two-point estimation method to perform initial probabilistic power flow calculation to obtain statistical data of the node voltage and objective function of each phase;

[0184] The voltage limit judgment module is configured to: according to the calculated voltage data of each phase node, judge whether the voltage limit problem occurs in the medium voltage and low voltage areas, if the voltage limit does not occur, return to the probability model building module and enter the next one Control cycle; otherwise, enter the control model build...

Example Embodiment

[0187] Example 3:

[0188] Embodiment 3 of the present disclosure provides a readable storage medium on which a program is stored. When the program is executed by a processor, the three-phase medium and low voltage integrated power distribution network voltage control method described in Embodiment 1 of the present disclosure A step of.

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Abstract

The invention provides a three-phase medium-low voltage integrated power distribution network voltage control method and system. The method comprises the steps of: reading original data of a power distribution network, establishing an uncertainty probability model of output and load of a distributed power supply, performing initial probabilistic load flow calculation by utilizing a two-point estimation method to obtain statistical data of the node voltage and the objective function of each phase, determining whether a voltage out-of-limit problem occurs in medium-voltage and low-voltage regions or not, and if not, returning to enter the next control period; otherwise, on the basis of probabilistic load flow calculation, establishing the three-phase voltage control model of the medium-low voltage integrated power distribution network, performing solving by using a genetic algorithm to obtain a regulation and control value of each control variable, and further controlling the medium-lowvoltage integrated power distribution network. The active control capability of the low-voltage power distribution network is fully utilized, the low-voltage power distribution network is coordinatedand controlled with the medium-voltage power distribution network to solve the problem that an original low-voltage power distribution network is passively controlled by the medium-voltage power distribution network, and the operation efficiency and the operation safety of the power distribution network are improved.

Description

technical field [0001] The present disclosure relates to the technical field of distribution network automation, in particular to a voltage control method and system for a three-phase, medium and low voltage integrated distribution network. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] In recent years, with the continuous development of the power industry, the power system is gradually developing towards digitalization, intelligence and automation. Compared with power generation, transmission and other links, my country's power distribution and power consumption have always been the weak links of the entire power system, seriously affecting the overall performance and efficiency of the system. Due to the lack of information interaction between the traditional medium and low voltage distribution networks, and the medium voltage 10kV an...

Claims

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Application Information

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IPC IPC(8): H02J3/12H02J3/38H02J3/46
CPCH02J3/12H02J3/381H02J3/46
Inventor 孙良志魏然王李龑李永旭李先栋平宝志刘德才王和先刘希峰贾凯莉张亚新
Owner 国网山东省电力公司聊城供电公司
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