CN-119134404-B - Multi-source cooperative AGC frequency modulation control method based on multi-level control

CN119134404BCN 119134404 BCN119134404 BCN 119134404BCN-119134404-B

Abstract

The invention provides a multisource collaborative AGC frequency modulation control method based on multi-level control, which belongs to the technical field of power systems and is an AGC hierarchical control method according to unit performance, according to the method, the units are classified into a fast-speed region unit, a medium-speed region unit and a slow-speed region unit according to the performance, the AGC control signals are correspondingly distributed to the units in each region through filtering treatment, and the battery charge and discharge states of the energy storage power station are fully considered. The invention can solve the problems of inaccurate positioning of various frequency modulation resource functions, insufficient resource utilization, extrusion, unreasonable calling, incapability of fully playing roles and the like of the frequency modulation resources in the conventional frequency modulation auxiliary service, and can effectively improve the comprehensive frequency modulation effect, thereby improving the economic benefit.

Inventors

ZHANG WEIJUN
ZHENG XUDONG
GUO WEI
DENG CHAOPING
HUANG TING
LI ZHICHENG
CHEN DAWEI
ZHANG SHULING
ZHENG CHENDA
WENG GUIPING

Assignees

国网福建省电力有限公司
国网福建省电力有限公司电力科学研究院

Dates

Publication Date: 20260512
Application Date: 20240910

Claims (5)

1. A multisource collaborative AGC frequency modulation control method based on multi-level control is used for an electrochemical energy storage power station and is characterized in that the method is an interconnection power grid AGC control mode adopting a frequency and tie line deviation control mode, each unit is firstly classified into a fast-area unit, a medium-speed-area unit and a slow-speed-area unit according to performance, when the frequency of a power system deviates from a target frequency due to frequency fluctuation of the power grid caused by active power unbalance of a power generating side and a power using side, AGC control signals of a power grid dispatching center are subjected to filtering treatment and correspondingly distributed to the units of each area, and according to the battery charge and discharge state of the energy storage power station, the active power output is adjusted by the units running in the power grid through a speed regulation system and an automatic power control mode through multi-level collaborative control, so that full utilization of frequency modulation resources is realized, and the comprehensive frequency modulation effect is improved; The AGC control signal acquisition method comprises the steps that a dispatching center of a power grid calculates an ACE value reflecting the active deviation condition of total power generation and total load in a whole control area through frequency deviation and tie line power deviation in the system, a signal corresponding to the ACE value passes through a frequency modulation controller to obtain a total frequency modulation instruction, the frequency modulation instruction is decomposed into an instruction for increasing output or reducing output and is sent to each unit participating in frequency modulation, and each unit adjusts the output in real time according to the instruction to keep the ACE value within an allowable range; The control method includes the following steps; Step S1, reading historical comprehensive performance indexes of all units in the system, dividing the historical comprehensive performance indexes into a fast-speed unit, a medium-speed unit and a slow-speed unit according to the comprehensive performance indexes, and executing the step S2; Step S2, performing high-pass, band-pass and low-pass filtering processing on ACE signals for frequency modulation control, dividing the signals into dead zone signals, fast zone signals, medium-speed zone signals and slow-speed zone signals, and executing step S3; step S3, reading the state of charge (SOC) of an electrochemical energy storage battery in the current system, adjusting part of the rapid zone signals to a medium-speed zone according to whether the SOC of the electrochemical energy storage power station reaches a limit value, and executing step S4; s4, distributing signals of different partitions to units of corresponding partitions, and executing the step S5; s5, according to actual response conditions of each unit in preset time, recalculating comprehensive performance indexes of the units, and correcting and updating calculation results to the step S1 in real time; In step S1, each unit in the system is classified according to actual performance, including the following steps: Step S11, defining the adjusting speed K 1 , the adjusting precision K 2 and the response time K 3 of the unit, and executing step S12; step S12, according to the weighted calculation comprehensive performance index K, executing step S13; In step S13, the unit with the comprehensive performance index K value greater than K f is defined as a fast unit, the unit with the comprehensive performance index K value between K f and K s is defined as a medium speed unit, and the unit with the comprehensive performance index K value less than K s is defined as a slow unit.
2. The multi-level control-based multi-source cooperative AGC frequency modulation control method as set forth in claim 1, wherein in the step S2, ACE signals in the system are processed through filtering, and the method comprises the following steps: step S21, processing the signal by adopting fast Fourier transform to obtain frequency domain information of ACE signals, and executing step S22; In step S22, a signal with a frequency above f d is defined as a dead zone, a signal with a frequency between f d and f f is defined as a fast zone, a signal with a frequency between f f and f s is defined as a medium speed zone, and a signal with a frequency below f s is defined as a slow speed zone.
3. The multi-level control-based multi-source cooperative AGC frequency modulation control method as set forth in claim 2, wherein in the step S3, the fast zone signal is redistributed according to the SOC stored in the system, and the method comprises the steps of: step S31, reading the SOC stored in the system, judging whether the system is overcharged/discharged, executing step S32 if the system is overcharged/discharged, and not adjusting if the system is in a normal state; Step S32, judging whether the signal is helpful for the energy storage battery to be out of an overcharge/discharge state, if not, executing step S33, and if so, not adjusting; Step S33, the corresponding fast zone signal is adjusted to the medium speed zone.
4. The multi-level control-based multi-source cooperative AGC frequency modulation control method as set forth in claim 3, wherein in the step S4, the signals of different partitions are respectively distributed to the sets of different partitions, and the method comprises the following steps: Step S41, dividing quotations of units in different partitions by comprehensive performance indexes, sequencing from low to high, and executing step S42; step S42, the response principle of each unit in the system is that dead zone signals do not respond, fast zone signals are distributed to fast zone unit responses, medium speed zone signals are distributed to medium speed zone unit responses, and slow speed zone signals are distributed to slow speed zone unit responses, and step S43 is executed; In step S43, ACE adjustment demands are preferentially allocated to units in front of each partition, and units with high performance and low price are preferentially called until the demands are satisfied.
5. The multi-level control-based multi-source cooperative AGC frequency modulation control method as set forth in claim 4, wherein the preset duration of step S5 is 15min.

Description

Multi-source cooperative AGC frequency modulation control method based on multi-level control Technical Field The invention relates to the technical field of power systems, in particular to a multi-source cooperative AGC frequency modulation control method based on multi-level control. Background In recent years, the construction of novel electric power systems in China is deepened continuously, the importance of auxiliary services is not neglected, the active power and the frequency of the systems are highly related, and as the installation body quantity and the duty ratio of new energy are improved year by year and the balance difficulty of supply and demand is increased, the automatic power generation control (Automatic Generation Control, AGC) system also faces important challenges in ensuring the stable operation of the systems. The response characteristics of various frequency modulation resources to AGC control are different, the current common AGC control mode is not distinguished according to the characteristics of a power supply, and the problems that the functions of the various frequency modulation resources are not positioned clearly, the resources are not fully utilized are easily caused, and further the frequency modulation resources are squeezed, unreasonably called, cannot fully play roles and the like are generated. For example, the independent novel energy storage is used as a rapid adjustment resource, the independent novel energy storage participates in the frequency modulation service market, the frequency modulation service market has the characteristics of rapid response and high adjustment precision, but the adjustment capacity is small, a large-step frequency modulation instruction cannot be executed, the problem of excessive charge and discharge needs to be considered, the speed of the pumping storage and the traditional hydroelectric generating set is high, the adjustment capacity is medium, the time of the thermal power generating set for responding to the AGC instruction is slow, and the adjustment capacity is large. How to comprehensively consider various power supply characteristics, fully exert various power supply advantages, avoid frequency modulation resource waste and solve the problem urgently needed at present. Disclosure of Invention The invention provides a multi-source cooperative AGC frequency modulation control method based on multi-level control, which can solve the problems that the functions of various frequency modulation resources in the current frequency modulation auxiliary service are not well positioned and the resources are not fully utilized, so that the extrusion, unreasonable calling, full play and the like of the frequency modulation resources are generated, and can effectively improve the comprehensive frequency modulation effect, thereby improving the economic benefit. The invention adopts the following technical scheme. A multi-source collaborative AGC frequency modulation control method based on multi-level control is used for an electrochemical energy storage power station, the method is an interconnection power grid AGC control method adopting a frequency and tie line deviation control mode, each unit is firstly classified into a fast-speed unit, a medium-speed unit and a slow-speed unit according to performance, when the frequency of a power grid deviates from a target frequency due to active power unbalance of a power generation side and a power utilization side, AGC control signals of a power grid dispatching center are correspondingly distributed to the units of each area through filtering treatment, and according to the battery charge and discharge state of the energy storage power station, the frequency deviation is reduced by adjusting the active power output of the units running in the power grid through a speed regulation system and an automatic power control mode through multi-level collaborative control, full utilization of frequency modulation resources is achieved, and comprehensive frequency modulation effect is improved. The AGC control signal acquisition method includes that a dispatching center of a power grid calculates an ACE value reflecting the active deviation condition of total power generation and total load in a whole control area through frequency deviation and tie line power deviation in the system, signals corresponding to the ACE value are subjected to a frequency modulation controller to obtain a total frequency modulation instruction, the frequency modulation instruction is decomposed into an instruction for increasing output or reducing output and is sent to each unit participating in frequency modulation, each unit adjusts the output in real time according to the instruction to enable the ACE value to be kept in an allowable range, meanwhile, the dispatching center generates a charging or discharging instruction and sends the charging or discharging instruction to an energy storage power station, and the energy