Method for evaluating and optimizing auto generation control effect of large power network grid-connected power plant

Abstract

The invention discloses a method for evaluating and optimizing auto generation control (AGC) effect of a large power network grid-connected power plant. The method is characterized by comprising the following steps of: 1) acquiring machine set power, AGC in-service and out-of-service signals, AGC adjustment limit value and AGC command data from an EMS system; 2) accurately calculating the actual rate of the AGC through a linear area search speed test method and a forced unperturbed speed test method; and 3) examining the parts, which do not satisfy a basic AGC service, according to an AGC basic service examination algorithm and an AGC assistant service compensation algorithm, and compensating the parts of an AGC assistant service. In an integrated system for the operation evaluation of the large power network grid-connected power plant in a certain area, the method originally realizes the evaluation of the comprehensive effect of the power plant AGC, examines the parts which do not satisfy the basic AGC service, compensates the parts of the AGC assistant service, promotes the plant-grid harmonization, and upgrades the operation stability of the power network.

Description

technical field [0001] The invention belongs to the technical field of electric power system automation, and relates to a method for evaluating and optimizing the automatic power generation control effect of a large grid-connected power plant. Background technique [0002] As we all know, automatic generation control (Auto Generation Control, hereinafter referred to as AGC) is an important means for the dispatching department to coordinate the active power balance of the power grid, and its action effect is related to power quality and power grid security. For a long time, the accurate evaluation of the AGC effect of grid-connected power plants in the interconnected large power grid system lacks effective means, mainly because two influencing factors have not been resolved: [0003] 1. Comprehensive evaluation is difficult. The unit input into AGC is not only the basic requirement to ensure the active power balance of the power grid, but also its actual regulation is also a...

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Problems solved by technology

The difficulty of definition is mainly reflected in: 1) The evaluation of AGC effect involves the contribution of AGC input state, AGC adjustable capacity, AGC adjustment speed, AGC adjustment accuracy, AGC adjustment power, etc. The basic requirements and the distinction of auxiliary functions must meet It is scientific and economical, and it is difficult to consider the safe operation of the real-time power grid; 2) There are many units in a large power grid, and they are located in different grid areas, and the capacity and performance of the units vary greatly. It is necessary to formulate a unified evaluation standard , individual differences must also be taken into account; 2) Due to operational needs, the dispatcher often agrees with the site to adjust the AGC’s commissioning and withdrawing status, etc. These artificial factors are difficult to automatically reflect in the evaluation system

[0004] 2. Accurate speed measurement is difficult

At present, the dispatching AGC system has limited grasp of various information that affects the adjustment of the unit, and usually adopts the method of manual speed measurement. However, due to the large change in the output of the unit under this method, it may have a great impact on the active power balance of the power grid and affect the safety of the power grid. Therefore, Experienced power grid dispatchers need to do a lot of cooperating work during the test operation, which is troublesome to implement

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