CN-122000854-A - Schedulable DC power supply system energy management strategy considering time lag correction

Abstract

The invention discloses a schedulable direct current power supply system energy management strategy considering time lag correction, which mainly comprises a schedulable direct current power supply system cooperative control module and a voltage and current double closed loop module. The control targets of the time lag correction, the average power distribution factor solving, the accurate distribution of output power and the bus voltage drop recovery of the schedulable direct-current power supply system can be synchronously realized under the same time scale by integrating the accurate power distribution control, the consistency algorithm considering the time lag correction and the bus voltage drop recovery control.

Inventors

• YANG LIAN
• LIAO JUNHAO
• ZOU HUIJIE
• GONG ZHONGLIANG
• LI YIBO

Assignees

• 广东工业大学

Dates

Publication Date

20260508

Application Date

20260210

Claims (2)

1. 1. A schedulable dc power system energy management strategy that considers time lag correction, comprising the steps of: step 1, after a schedulable direct current power supply system is started, collecting inductance current of an nth schedulable direct current power supply Output voltage Output current ,n=1,2,3,4...; Step 2, in the schedulable direct current power supply system cooperative control module, the schedulable direct current power supply inductance current Output voltage Rated voltage As input, after the consistency algorithm of accurate power distribution control and time lag correction consideration and bus voltage drop recovery control processing, the bus voltage drop recovery amount is output Comprising the following steps: Step 2-1, in the accurate power distribution control, the schedulable direct current power supply inductance current Divided by the maximum rated inductor current of the dispatchable DC power supply Obtaining the current per unit value of the inductor current of the schedulable direct-current power supply Will output voltage Divided by the maximum rated voltage Can obtain the per unit value of the output voltage Rated voltage Divided by the maximum rated voltage Can obtain rated voltage per unit value The specific expression is: (1) the current per unit value of the inductor of the schedulable direct current power supply And inductance current adjustment coefficient Multiplying, dividing the obtained result by the per unit value of the output voltage And output voltage regulation factor Can calculate the power distribution factor To make rated voltage per unit value And rated voltage regulation factor Multiplying, and subtracting the inductance current per unit value from the obtained result And inductance current adjustment coefficient Can calculate the power distribution error amount Power allocation factor And the amount of power allocation error The specific expression of (2) is: (2) Step 2-2, the power distribution factor generated in the step 2-1 is calculated As input, the average power distribution factor of the nth schedulable DC power supply can be calculated through the consistency algorithm processing considering time lag correction The specific expression is: (3) in the formula (3), the amino acid sequence of the compound, In order for the weights to be consistent, For sum index, the n-th schedulable DC power supply is any adjacent schedulable DC power supply, For the nth set of schedulable dc power neighboring nodes, An average power allocation factor for the jth schedulable dc power supply, In order for the laplace operator to be useful, To be able to schedule a time lag between the dc power sources, For the time lag correction link, the specific expression is: (4) In the formula (4), the amino acid sequence of the compound, As the time-lag correction coefficient, The factor correlation coefficient is allocated for the average power, As a function of the time constant, Time lag response time; step 2-3, in the bus voltage drop recovery control, the average power distribution factor of the nth schedulable DC power supply Subtracting the amount of power allocation error The sine value of the bus voltage drop recovery link PI controller is used for processing the obtained result to obtain the bus voltage drop recovery quantity The specific expression is: (5) In the formula (5), the amino acid sequence of the compound, And The proportional coefficient and the integral coefficient of the PI controller in the bus voltage drop recovery link are respectively; Step 3, in the voltage-current double closed-loop control module, the recovery quantity of the voltage drop of the bus is reduced Schedulable direct current power supply inductance current Output voltage Rated voltage And output current As input, after voltage-current double closed-loop control and PWM modulation, a modulation signal can be output To control the switching on and off of the schedulable dc power supply.
2. 2. The energy management strategy for a schedulable dc power supply system with skew correction of claim 1, wherein in step 2, the inductor current adjustment factor The range of the value of (2) is 0< <3, Output Voltage Regulation coefficient The range of the value of (2) is 0< <1, Rated voltage adjustment coefficient The range of the value of (2) is 0.4< <1.2, Time lag correction coefficient The range of the value of (2) is 20< <40, Average Power Allocation factor correlation coefficient The range of the value of (2) is 0.5< <2.5 Time constant The range of the value of (2) is 0.003< Time lag response time of <0.03 The value range of (2) is 0.0005< > <0.005, Proportional coefficient of bus voltage drop recovery link PI controller The range of the value of (2) is 0.5< <2, Integral coefficient of PI controller in bus voltage drop recovery link The range of the value is 12< <25。

Description

Schedulable DC power supply system energy management strategy considering time lag correction Technical Field The invention relates to the field of distributed energy storage systems of direct-current micro-grids, in particular to a schedulable direct-current power supply system energy management strategy considering time lag correction. Background With the rapid development and wide application of new energy power generation technology, the core supporting effect of a schedulable direct current power supply system in a micro-grid and an intelligent power distribution network is increasingly remarkable, and the schedulable direct current power supply system is generally required to realize multiple control targets such as accurate power distribution, stable bus voltage and the like so as to meet multiple requirements of the power system on the power quality and the running economy. However, each unit in the schedulable direct current power supply system is distributed, when information interaction and control instruction transmission are carried out among the units through a communication network, the phenomenon of time lag surge is easy to occur, if the time lag is not corrected effectively in time, bus voltage dip and instant increase of power distribution deviation are possibly caused, control failure is possibly caused when serious, and finally the system is unstable. Therefore, the invention designs a schedulable direct current power supply system energy management strategy considering time lag correction, which can synchronously realize the control targets of the schedulable direct current power supply system time lag correction, average power distribution factor solving, accurate output power distribution and bus voltage drop recovery under the same time scale. Disclosure of Invention In order to achieve the above purpose, the technical scheme provided by the invention is as follows: step 1, after a schedulable direct current power supply system is started, collecting inductance current of an nth schedulable direct current power supply Output voltageOutput current,n=1,2,3,4...; Step 2, in the schedulable direct current power supply system cooperative control module, the schedulable direct current power supply inductance currentOutput voltageRated voltageAs input, after the consistency algorithm of accurate power distribution control and time lag correction consideration and bus voltage drop recovery control processing, the bus voltage drop recovery amount is outputComprising the following steps: Step 2-1, in the accurate power distribution control, the schedulable direct current power supply inductance current Divided by the maximum rated inductor current of the dispatchable DC power supplyObtaining the current per unit value of the inductor current of the schedulable direct-current power supplyWill output voltageDivided by the maximum rated voltageCan obtain the per unit value of the output voltageRated voltageDivided by the maximum rated voltageCan obtain rated voltage per unit valueThe specific expression is: (1) the current per unit value of the inductor of the schedulable direct current power supply And inductance current adjustment coefficientMultiplying, dividing the obtained result by the per unit value of the output voltageAnd output voltage regulation factorCan calculate the power distribution factorTo make rated voltage per unit valueAnd rated voltage regulation factorMultiplying, and subtracting the inductance current per unit value from the obtained resultAnd inductance current adjustment coefficientCan calculate the power distribution error amountPower allocation factorAnd the amount of power allocation errorThe specific expression of (2) is: (2) Step 2-2, the power distribution factor generated in the step 2-1 is calculated As input, the average power distribution factor of the nth schedulable DC power supply can be calculated through the consistency algorithm processing considering time lag correctionThe specific expression is: (3) in the formula (3), the amino acid sequence of the compound, In order for the weights to be consistent,For sum index, the n-th schedulable DC power supply is any adjacent schedulable DC power supply,For the nth set of schedulable dc power neighboring nodes,An average power allocation factor for the jth schedulable dc power supply,In order for the laplace operator to be useful,To be able to schedule a time lag between the dc power sources,For the time lag correction link, the specific expression is: (4) In the formula (4), the amino acid sequence of the compound, As the time-lag correction coefficient,The factor correlation coefficient is allocated for the average power,As a function of the time constant,Time lag response time; step 2-3, in the bus voltage drop recovery control, the average power distribution factor of the nth schedulable DC power supply Subtracting the amount of power allocation errorThe sine value of the bus voltage drop recovery link PI c