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DC sending-end hydropower station optimal scheduling method compatible with receiving-end power grid peak regulation requirements

A receiving-end power grid and optimal dispatching technology, applied in the field of energy and electric power, can solve the problems that nonlinear programming methods cannot consider the start and stop status of units, difficulties, and difficulty in obtaining dual equations

Pending Publication Date: 2020-06-30
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many methods for solving this kind of problems, including Lagrangian relaxation method, dynamic programming and its derivative algorithms, intelligent algorithms and nonlinear programming methods, etc. , will face many difficulties
Due to the non-convex and nonlinearity of the model, it is difficult for the Lagrangian relaxation method to obtain an accurate dual equation; since the operating constraints of each unit in the power station need to be taken into account, dynamic programming often faces the problem of "dimensionality" when solving this problem. "disaster" problem; intelligent algorithms, such as genetic algorithm, differential evolution algorithm, particle swarm algorithm and bee colony algorithm, also have problems such as easy to fall into local optimal solution, difficult to effectively deal with complex constraints and unstable calculation results; nonlinear programming methods cannot Consider the start and stop status of the unit, so it cannot be applied to this problem

Method used

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  • DC sending-end hydropower station optimal scheduling method compatible with receiving-end power grid peak regulation requirements
  • DC sending-end hydropower station optimal scheduling method compatible with receiving-end power grid peak regulation requirements
  • DC sending-end hydropower station optimal scheduling method compatible with receiving-end power grid peak regulation requirements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] Example 1. Objective function

[0116] When formulating the power transmission plan for its direct transmission-end hydropower station, while ensuring the safe and stable operation of the power station, the load characteristics of the receiving-end power grid in the eastern region should be taken into consideration to help alleviate the peak-shaving pressure of the power grid in these regions and increase the consumption of clean energy in the grid. Accept the space. At present, the most commonly used peak shaving targets are the minimum maximum entropy aggregation function value and the minimum mean square error of the residual load of the grid, but both are difficult to linearize. Considering that the main measure of hydropower peak shaving is to generate more electricity at peak load and less or no electricity at load trough, this model adopts the minimum net load peak-valley difference of each receiving end as the goal, which is expressed as follows:

[0117]

[0118] C...

Embodiment 2

[0129] Example 2. Constraints

[0130] (1) Water balance restriction

[0131]

[0132] Where: V t Is the storage capacity of the reservoir at the end of period t (m 3 ); I t Is the inflow of the reservoir in t period (m 3 / s); S t Indicates the abandoned water flow of the power station during t period (m 3 / s); Δt is the time step (h); Q t Is the generation flow of the power station during t period (m 3 / s); I and i are the total number and unit number of the hydropower station, respectively; q i,t Is the generation flow of unit i during t period (m 3 / s).

[0133] (2) Water level restriction

[0134] Z min ≤Z t ≤Z max (8)

[0135]

[0136] Where: Z t Indicates the water level in front of the dam of the reservoir at the end of period t (m); Z max ,Z min They are the highest and lowest water level in front of the dam (m); Z begin Is the actual water level of the reservoir at the beginning of the operation period (m); Z end It is the target control water level at the end of the sc...

Embodiment 3

[0203] Example 3. Example analysis

[0204] In order to verify the effectiveness of the on-demand model construction method proposed in the present invention, the model was applied to the formulation of a short-term power generation plan of Xiluodu Hydropower Station on a certain day during the dry season. The Xiluodu Hydropower Station is a giant water conservancy project located in the lower reaches of the Jinsha River in my country. The regulation performance of the reservoir is annual regulation, including 18 units and a total installed capacity of 12.6 million kW. According to the current dispatching plan, the 9 units on the left bank are dispatched by the National Electric Power Dispatching Center and sent directly to Zhejiang Power Grid through the ±800kV UHV DC link line, while the 9 units on the right bank are dispatched by the China Southern Power Grid Dispatching Center and delivered via the ±500kV UHV link line. Guangdong power grid transmission. The main operating p...

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Abstract

The invention discloses a DC sending-end hydropower station optimal scheduling method compatible with receiving-end power grid peak regulation requirements. The method comprises the steps: carrying out modeling construction on the hydropower short-term optimization scheduling problem to obtain a mathematical model; after calculation conditions are set, linearizing an objective function firstly, performing linearization processing on nonlinear objective constraints on the premise that precision is allowed, and then converting an original highly-non-convex mixed integer nonlinear programming model into a mixed integer linear programming model, and solving the model on the basis of the mixed integer linear programming model through employing an optimization solver. The model provided by theinvention has relatively high calculation efficiency; the formulated power transmission plan effectively responds to the peak regulation demand of each receiving-end power grid, the peak-valley difference of the power grid is remarkably reduced, the power transmission limitation of the direct-current tie line is met, the executability of the direct-current tie line plan is improved, and the trans-regional coordinated operation of the sending-end hydropower station, the high-voltage direct-current tie line and the receiving-end power grid is realized.

Description

Technical field [0001] The invention relates to the technical field of energy and electric power, in particular to an optimized dispatching method for a DC transmission end hydropower station. Background technique [0002] The feed-in of high-power high-voltage direct current hydropower greatly eases the energy shortage and atmospheric pollution pressure in the eastern region. However, because its transmission curve rarely considers the peak-shaving demand of the receiving-end power grid, in many cases it will cause the receiving-end power grid to fail Failure to passively consume a large amount of trough power further aggravates the peak-shaving pressure of the receiving-end power grid, which is not conducive to the stable operation of the receiving-end power grid, and also affects the ability of the receiving-end power grid to absorb clean energy. Therefore, there is an urgent need to change the current dispatching operation and power transmission mode of the current HVDC trans...

Claims

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Application Information

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IPC IPC(8): G06Q10/04G06Q10/06G06Q50/06
CPCG06Q10/04G06Q10/067G06Q50/06
Inventor 原文林卢璐苏承国吴洋周彬彬
Owner ZHENGZHOU UNIV
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