CN114329310A - Balance degree calculation method for factory power system of power plant - Google Patents

Balance degree calculation method for factory power system of power plant Download PDF

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CN114329310A
CN114329310A CN202111653705.XA CN202111653705A CN114329310A CN 114329310 A CN114329310 A CN 114329310A CN 202111653705 A CN202111653705 A CN 202111653705A CN 114329310 A CN114329310 A CN 114329310A
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power
voltage
balance
distribution system
calculating
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杨子建
张小宁
赵璐
王越超
闫乃欣
陈思远
李新兴
刘硕
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Beijing Jingneng Gaoantun Gas Thermoelectricity Co ltd
Shenyang University of Technology
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Beijing Jingneng Gaoantun Gas Thermoelectricity Co ltd
Shenyang University of Technology
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Abstract

The invention provides a balance degree calculation method for an auxiliary power system of a power plant, and relates to the technical field of power systems. The method comprises the steps of firstly analyzing the influence of two-drive-one and one-drive-one operation modes of the gas-steam combined cycle unit on the balance degree of the service power, and calculating the influence factors of the two operation modes of the gas-steam combined cycle unit on the balance degree of the service power; then, respectively calculating the power utilization balance degrees of the factory high-voltage power distribution system and the factory low-voltage power distribution system; and finally, analyzing the influence of any auxiliary equipment on the balance of the auxiliary power, and calculating the contribution of the auxiliary equipment to the flatness of the auxiliary power system on the basis of the calculation method of the power balance of the auxiliary high-voltage power distribution system and the auxiliary low-voltage power distribution system. The method can be used for calculating the balance degree of the factory-used high-voltage power distribution system and the factory-used low-voltage power distribution system, and meanwhile, the influence degree of the equipment on the balance degree of the factory power can be determined through the change of the balance degree of the factory power system before and after any power equipment is started.

Description

Balance degree calculation method for factory power system of power plant
Technical Field
The invention relates to the technical field of power systems, in particular to a balance degree calculation method for an auxiliary power system of a power plant.
Background
Along with the development of economic society, the power demand of China is greater and greater, the requirement on the safe and stable operation of a power system is higher and higher, and the stable power transmission of a power plant is a precondition for ensuring the stability of the power system, so that the balance of service electricity is very critical to the stable power transmission of the power plant, the balance degree of the service electricity is calculated, and the balance state of the service electricity is very important to master. In order to solve the above problems, a method for calculating the balance degree of the auxiliary power is needed, which calculates the balance degree of the auxiliary power and the contribution degree of the auxiliary power equipment to the balance degree of the auxiliary power, and determines the balance state of the auxiliary power system.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for calculating the balance degree of the auxiliary power system of the power plant aiming at the defects of the prior art, and the method is used for calculating the balance value of the auxiliary power and the contribution degree of the auxiliary power equipment to the balance degree of the auxiliary power and determining the balance state of the auxiliary power system.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: firstly, analyzing the influence of a two-in-one operation mode of a gas-steam combined cycle unit on the balance degree of the auxiliary power and the influence of a one-in-one operation mode on the balance degree of the auxiliary power, and calculating the influence factors of the two-in-one and one-in-one operation modes of the gas-steam combined cycle unit on the balance degree of the auxiliary power; then, respectively calculating the power utilization balance degrees of a factory high-voltage power distribution system (6kV system) and a factory low-voltage power distribution system (380V system); finally, analyzing the influence of any auxiliary equipment on the balance of the auxiliary power, and calculating the contribution of the auxiliary equipment to the flatness of the auxiliary power system on the basis of the 6kV system and 380V system power balance calculation method, specifically comprising the following steps of:
step 1: calculating influence factors of two-in-one and one-in-one operation modes of the gas-steam combined cycle unit on the balance degree of the auxiliary power;
step 1.1: collecting historical voltage U of a factory high-voltage distribution system when n groups of gas-steam combined cycle units adopt a two-in-one operation modei0Current Ii0Power Pi0Power factor of the power converter
Figure BDA0003445276660000011
n and n groups of historical voltages U of the factory high-voltage distribution system in a one-to-one operation modei1Current Ii1Power Pi1Power factor of the power converter
Figure BDA0003445276660000012
Step 1.2: and (3) performing per unit value calculation on the data acquired in the step 1.1, wherein the per unit value calculation is shown by the following formula:
Figure BDA0003445276660000013
Figure BDA0003445276660000021
wherein, Ui0,bAnd U'i0Are respectively a voltage Ui0Reference value and per unit value of (I)i0,bAnd l'i0Are respectively current Ii0Reference value and per unit value of (P)i0,bAnd P'i0Are respectively power Pi0The reference value and the per unit value of (c),
Figure BDA0003445276660000022
and
Figure BDA0003445276660000023
are respectively power factor
Figure BDA0003445276660000024
Reference value and per unit value of (U)i1,bAnd U'i1Are respectively a voltage Ui1Reference value and per unit value of (I)i1,bAnd l'i1Are respectively current Ii1Reference value and per unit value of (P)i1，bAnd P'i1Are respectively power Pi1The reference value and the per unit value of (c),
Figure BDA0003445276660000025
and
Figure BDA0003445276660000026
are respectively power factor
Figure BDA0003445276660000027
A reference value and a per unit value of;
step 1.3: calculating influence factors of two-in-one and one-in-one operation modes of the gas-steam combined cycle unit on the balance degree of the auxiliary power;
influence factor phi of two-in-one operation mode of gas-steam combined cycle unit on balance degree of auxiliary power0As shown in the following equation:
Figure BDA0003445276660000028
influence factor phi of one-to-one operation mode of gas-steam combined cycle unit on balance degree of auxiliary powertAs shown in the following equation:
Figure BDA0003445276660000029
step 2: calculating the power balance degree of a factory high-voltage power distribution system;
step 2.1: collecting real-time voltage U of high-voltage distribution system for planthCurrent IhPower PhPower factor of the power converter
Figure BDA00034452766600000210
And calculating the per unit value of the data, wherein the following formula is shown as follows:
Figure BDA00034452766600000211
wherein, UhL,bAnd Uh' are respectively a voltage UhReference value and per unit value of (I)h,bAnd Ih' are respectively the current IhReference value and per unit value of (P)h,bAnd Ph' are respectively power PhThe reference value and the per unit value of (c),
Figure BDA0003445276660000031
and
Figure BDA0003445276660000032
are respectively power factor
Figure BDA0003445276660000033
A reference value and a per unit value of;
step 2.2: calculating the power utilization balance degree delta of the factory high-voltage power distribution system according to the data acquired in the step 2.10The following formula shows:
Figure BDA0003445276660000034
and step 3: calculating the power utilization balance degree of a factory low-voltage power distribution system;
step 3.1: collecting real-time voltage U of low-voltage distribution system for plantlCurrent IlPower PlPower factor of the power converter
Figure BDA0003445276660000035
Data in pairThe data are subjected to per unit value calculation, as shown in the following formula:
Figure BDA0003445276660000036
wherein, Ul,bAnd Ul' are respectively a voltage UlReference value and per unit value of (I)l,bAnd Il' are respectively the current IlReference value and per unit value of (P)l,bAnd Pl' are respectively power PlThe reference value and the per unit value of (c),
Figure BDA0003445276660000037
and
Figure BDA0003445276660000038
are respectively power factor
Figure BDA0003445276660000039
A reference value and a per unit value of;
step 3.2: calculating the power utilization balance degree delta of the factory low-voltage power distribution system according to the data acquired in the step 3.1tThe following formula shows:
Figure BDA00034452766600000310
and 4, step 4: calculating the contribution degree of the auxiliary power equipment to the balance of the auxiliary power;
step 4.1: calculating the power utilization balance degree of a factory high-voltage power distribution system and the power utilization balance degree of a factory low-voltage power distribution system before and after the starting of the factory equipment;
acquiring voltage U of station service high-voltage distribution system before starting station service equipmenth0Current Ih0Power Ph0Power factor of the power converter
Figure BDA00034452766600000311
Voltage U of low-voltage power distribution system for factoryl0Current Il0Power Pl0Power factor of the power converter
Figure BDA00034452766600000312
Voltage U of station service high-voltage distribution system after station service equipment is startedh1Current Ih1Power Ph1Power factor of the power converter
Figure BDA0003445276660000041
System voltage U of low-voltage power distribution system for factoryl1Current Il1Power Pl1Power factor of the power converter
Figure BDA0003445276660000042
And respectively calculating the power balance degree delta of the high-voltage power distribution system for the factory before and after the starting of the factory equipment according to the system electric balance degree calculation methods in the step 2 and the step 30、δ01Power consumption balance degree delta of station low-voltage power distribution systemt、δt1；
Step 4.2: calculating the contribution degree of the auxiliary power equipment to the balance of the auxiliary power;
calculating the contribution degree of the auxiliary power equipment to the balance of the auxiliary power, wherein the formula is as follows:
Figure BDA0003445276660000043
adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the method for calculating the balance degree of the factory power system of the power plant solves the problem that the balance degree of the factory power system can only be calculated with the balance degree of a factory power distribution system of 10kV level or more in the conventional method for calculating the balance degree of the factory power system, can be used for calculating the balance degree of a 6kV level or 380V level power distribution system, can determine the influence degree of equipment on the balance degree of the factory power through the balance degree change of the factory power system before and after any power equipment is started, and can better master the balance state of the factory power system in real time.
Drawings
Fig. 1 is a flowchart of a method for calculating a balance of an auxiliary power system of a power plant according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In this embodiment, a thermal power plant in a certain area is taken as an example, the balance degree of the plant power system of the power plant is calculated by using the balance degree calculation method of the plant power system of the power plant, and meanwhile, the influence degree of the plant power equipment on the balance degree of the plant power is determined.
In this embodiment, a method for calculating a balance of an auxiliary power system of a power plant, as shown in fig. 1, includes the following steps:
step 1: calculating influence factors of two-in-one and one-in-one operation modes of the gas-steam combined cycle unit on the balance degree of the auxiliary power;
the two-driving-one gas-steam combined cycle unit has two-driving-one and one-driving-one operation modes, and the change of the operation modes influences the outcoming power of the unit to the whole plant electric balance judgment, so that the influence of different operation modes on the plant electric balance is firstly analyzed;
step 1.1: collecting historical voltage U of a factory high-voltage distribution system (6KV system) when n groups of gas-steam combined cycle units adopt a two-in-one operation modei0Current Ii0Power Pi0Power factor of the power converter
Figure BDA0003445276660000051
n and n groups of historical voltages U of the factory high-voltage distribution system in a one-to-one operation modei1Current Ii1Power Pi1Power factor of the power converter
Figure BDA0003445276660000052
In this embodiment, first, historical influence parameters of 10 groups of gas-steam combined cycle units are collected for a thermal power plant in the region, and the historical voltage, U, of a 6kV system when the gas-steam combined cycle unit adopts a two-to-one operation mode10＝5.96kV、U20＝5.99kV、U30＝6.02kV、U40＝5.95kV、U50＝5.98kV、U60＝6.03kV、U70＝5.97kV、U80＝6.01kV、U90＝6.09kV、U1006.07kV, and the voltage reference value is 6 kV; current I10＝1867.2A，I20＝1866.9A，I30＝1866.7A，I40＝1868.1A，I50＝1867.3A，I60＝1866.8A，I70＝1867.9A，I80＝1866.7A，I90＝1866.5A，I1001866.6a, current reference value 1867A; power P10＝11.13MW，P20＝11.18MW，P30＝11.24MW，P40＝11.12MW，P50＝11.17MW，P60＝11.27MW，P70＝11.15MW，P80＝11.22MW，P90＝11.37MW，P10011.33MW, the power reference value is 11.2 MW; power factor
Figure BDA0003445276660000053
Figure BDA0003445276660000054
The power factor reference value is 0.8. 6kV system voltage U in one-to-one operation mode11＝5.97kV，U21＝5.99kV，U31＝6.03kV，U41＝5.97kV，U51＝5.99kV，U61＝6.02kV，U71＝5.96kV，U81＝6.02kV，U91＝6.05kV，U1016.07kV, and 6kV of voltage reference value; current I11＝696.7A，I21＝696.9A，I31＝697.1A，I41＝696.6A，I51＝696.8A，I61＝697.1A，I71＝697.2A，I81＝696.8A，I91＝696.7A，I101697.1a, current reference value 697A; power P11＝4.159MW，P21＝4.174MW，P31＝4.204MW，P41＝4.159MW，P51＝4.174MW，P61＝4.197MW，P71＝4.155MW，P81＝4.195MW，P91＝4.215MW，P1014.231MW, Power reference value 4.2MW；
Figure BDA0003445276660000055
Figure BDA0003445276660000056
The power factor reference value is 0.8.
Step 1.2: calculating the per unit value of the data collected in the step 1.1;
U’10＝0.9933，U’20＝0.9983，U’30＝1.0033，U’40＝0.9917，U’50＝0.9967，U’60＝1.005，U’70＝0.995，U’80＝1.0017，U’90＝1.015，U’100＝1.0117；I’10＝1.0001，I’20＝0.9999，I’30＝0.9998，I’40＝1.0006，I’50＝1.0002，I’60＝0.9999，I’70＝1.0005，I’80＝0.9999，I’90＝0.9997，I’100＝0.9998；P’10＝0.99375，P’20＝0.9982，P’30＝1.0036，P’40＝0.9929，P’50＝0.9973，P’60＝1.00625，P’70＝0.9955，P’80＝1.0018，P’90＝1.0152，P’100＝1.0116；
Figure BDA0003445276660000066
Figure BDA0003445276660000062
U’11＝0.995，U’21＝0.9983，U’31＝1.005，U’41＝0.995，U’51＝0.9983，U’61＝1.0033，U’71＝0.9933，U’81＝1.0033，U’91＝1.0083，U’101＝1.0117；I’11＝0.9997，I’21＝0.9999，I’31＝1.0001，I’41＝0.9994，I’51＝0.9997，I’61＝1.0001，I’71＝1.0003，I’81＝0.9997，I’91＝0.9996，I’101＝1.0001；P’11＝0.9902，P’21＝0.9938，P’31＝1.0010，P’41＝0.9902，P’51＝0.9938，P’61＝0.9993，P’71＝0.9893，P’81＝0.9988，P’91＝1.0036，P’101＝1.0074；
Figure BDA0003445276660000063
Figure BDA0003445276660000064
step 1.3: calculating influence factors of two-in-one and one-in-one operation modes of the gas-steam combined cycle unit on the balance degree of the auxiliary power;
influence factor phi of two-in-one operation mode of gas-steam combined cycle unit on balance degree of auxiliary power0As shown in the following equation:
Figure BDA0003445276660000065
in this example phi0＝1.246349394；
Influence factor phi of one-to-one operation mode of gas-steam combined cycle unit on balance degree of auxiliary powertAs shown in the following equation:
Figure BDA0003445276660000071
in this embodiment, phit＝1.245048658；
Step 2: calculating the power utilization balance degree of the high-voltage distribution system for the plant under the two operation modes of the gas-steam combined cycle unit;
step 2.1: real-time voltage U of high-voltage distribution system for factory under two operation modes of gas-steam combined cycle unit is collectedhCurrent IhPower PhPower factor of the power converter
Figure BDA0003445276660000076
And calculating per unit value of the data:
(1) gas-steam combined cycle unit adopting two-in-one operation mode
In this embodiment, when the gas-steam combined cycle unit adopts a two-to-one operation mode, the voltage U of the acquired 6kV systemhSetting the voltage reference value to be 5.96kV, and setting the voltage reference value to be 6 kV; current IhWhen the current reference value is 1867.2a, 1867A is taken; power PhThe power reference value is 11.2 MW; power factor
Figure BDA0003445276660000072
Taking a power factor reference value as 0.8;
Figure BDA0003445276660000073
(2) the gas-steam combined cycle unit adopts a one-to-one operation mode
In this embodiment, when the gas-steam combined cycle unit adopts a one-to-one operation mode, the acquired voltage U of the 6kV systemhThe voltage reference value is 6kV when the voltage is 5.97 kV; current Ih696.7A, the current reference value is 697A; power Ph4.159MW, the power reference value is 4.2 MW; power factor
Figure BDA0003445276660000074
The power factor reference value is taken to be 0.8.
Figure BDA0003445276660000075
Step 2.2: calculating the power utilization balance degree of the station high-voltage power distribution system according to the data acquired in the step 2.1:
(1) when the gas-steam combined cycle unit adopts a two-in-one operation mode, the power utilization balance degree of the station high-voltage distribution system
Figure BDA0003445276660000081
(2) When the gas-steam combined cycle unit adopts a one-to-one operation mode, the power utilization balance degree of the station high-voltage distribution system
Figure BDA0003445276660000082
And step 3: calculating the power utilization balance degree of a low-voltage distribution system (380V) for a plant under two operation modes of the gas-steam combined cycle unit;
step 3.1: real-time voltage U of low-voltage distribution system for factory under two operation modes of gas and steam combined cycle unit is collectedlCurrent IlPower PlPower factor of the power converter
Figure BDA0003445276660000083
Calculating per unit value of the data;
(1) gas-steam combined cycle unit adopting two-in-one operation mode
In this embodiment, when the gas-steam combined cycle unit adopts the two-in-one operation mode, the collected station low-voltage distribution system voltage U is acquiredl377.6V, the voltage reference value is 380V; current Il558.7a, current reference value 550A; power Pl211kW and 200kW of power reference value; power factor
Figure BDA0003445276660000084
The power factor reference value is 0.8, and the per unit value of each datum is as follows:
Figure BDA0003445276660000085
(2) the gas-steam combined cycle unit adopts a one-to-one operation mode
In this embodiment, when the gas-steam combined cycle unit adopts a one-driving-one operation mode, the collected 380V system voltageUl377.8V, the voltage reference value is 380V; current Il427.2a, current reference value 430A; power Pl161.4kW, and 160kW of power reference value; power factor
Figure BDA0003445276660000086
The power factor reference value is 0.8, and the per unit value of each datum is as follows:
Figure BDA0003445276660000087
step 3.2: calculating the power utilization balance degree of a 380V system under two operation modes of the gas-steam combined cycle unit according to the data acquired in the step 3.1:
(1) when the gas-steam combined cycle unit adopts a two-in-one operation mode, the power utilization balance degree of a 380V system is as follows:
Figure BDA0003445276660000091
(2) when the gas-steam combined cycle unit adopts a one-to-one operation mode, the power utilization balance degree of a 380V system is as follows:
Figure BDA0003445276660000092
and 4, step 4: calculating the contribution degree of the auxiliary power equipment to the balance of the auxiliary power;
step 4.1: calculating the power utilization balance degree of a factory high-voltage power distribution system and the power utilization balance degree of a factory low-voltage power distribution system before and after the starting of the factory equipment;
in this embodiment, the collected voltage U of the 6kV system before the start of a certain service equipmenth05.96kV and current Ih01867.2A, Power Ph011.13MW, power factor
Figure BDA0003445276660000093
380V system voltage Ul0377.6V, Current Il0＝558.7APower Pl0211kW, power factor
Figure BDA0003445276660000094
6kV system voltage U after startingh15.95kv, current Ih11868.1A, Power Ph111.15MW, power factor
Figure BDA0003445276660000095
380V system voltage Ul1376.3V, Current Il1563.7A, Power Pl1212kW, power factor
Figure BDA0003445276660000096
And so on. A voltage reference value of a 6kV system is 6kV, a current reference value 1867A, a power reference value 11.2MW and a power factor reference value 0.8; 380V system voltage reference value 380V, current reference value 550A, power reference value 200kW, power factor reference value 0.8.
Respectively calculating the power balance degree delta of the high-voltage power distribution system for the factory before and after the equipment is started according to the calculation methods provided in the step 2 and the step 30、δ01Power consumption balance degree delta of station low-voltage power distribution systemt、δt1；
Figure BDA0003445276660000097
Figure BDA0003445276660000101
Figure BDA0003445276660000102
Figure BDA0003445276660000103
Step 4.2: calculating the contribution degree of the auxiliary power equipment to the balance of the auxiliary power;
calculating the contribution degree of the auxiliary power equipment to the balance of the auxiliary power, wherein the formula is as follows:
Figure BDA0003445276660000104
in this embodiment, the contribution of the auxiliary power equipment to the balance of the auxiliary power is 5.96%.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.

Claims (7)

1. A balance degree calculation method for an auxiliary power system of a power plant is characterized by comprising the following steps: firstly, analyzing the influence of a two-in-one operation mode of the gas-steam combined cycle unit on the balance degree of the service power and the influence of a one-in-one operation mode on the balance degree of the service power, and calculating the influence factors of the two-in-one and one-in-one operation modes of the gas-steam combined cycle unit on the balance degree of the service power; then, respectively calculating the power utilization balance degrees of the factory high-voltage power distribution system and the factory low-voltage power distribution system; and finally, analyzing the influence of any auxiliary equipment on the balance of the auxiliary power, and calculating the contribution degree of the auxiliary equipment to the flatness of the auxiliary power system on the basis of the power balance calculation method of the auxiliary high-voltage power distribution system and the auxiliary low-voltage power distribution system.
2. The method for calculating the balance of the power plant auxiliary power system according to claim 1, wherein: the method specifically comprises the following steps:
step 1: calculating influence factors of two-in-one and one-in-one operation modes of the gas-steam combined cycle unit on the balance degree of the auxiliary power;
step 1.1: collecting historical voltage U of a factory high-voltage distribution system when n groups of gas-steam combined cycle units adopt a two-in-one operation modei0Current Ii0Power Pi0Power factor of the power converter
Figure FDA0003445276650000011
And n groups of historical voltages U of the factory high-voltage distribution system in a one-to-one operation modei1Current Ii1Power Pi1Power factor of the power converter
Figure FDA0003445276650000012
And calculate the per unit value of these data;
step 1.2: calculating influence factors of two-in-one and one-in-one operation modes of the gas-steam combined cycle unit on the balance degree of the auxiliary power;
step 2: calculating the power balance degree of a factory high-voltage power distribution system;
step 2.1: collecting real-time voltage U of high-voltage distribution system for planthCurrent IhPower PhPower factor of the power converter
Figure FDA0003445276650000013
Calculating per unit value of the data;
step 2.2: calculating the power utilization balance degree delta of the factory high-voltage power distribution system according to the per unit value of the data acquired in the step 2.10；
And step 3: calculating the power utilization balance degree of a factory low-voltage power distribution system;
step 3.1: collecting real-time voltage U of low-voltage distribution system for plantlCurrent IlPower PlPower factor of the power converter
Figure FDA0003445276650000014
Calculating per unit value of the data;
step 3.2: calculating the factory low-voltage distribution system according to the per unit value of the data acquired in the step 3.1Degree of electrical balance delta of systemt；
And 4, step 4: calculating the contribution degree of the auxiliary power equipment to the balance of the auxiliary power;
step 4.1: calculating the power utilization balance degree of a factory high-voltage power distribution system and the power utilization balance degree of a factory low-voltage power distribution system before and after the starting of the factory equipment;
step 4.2: according to the power balance degree delta of the high-voltage power distribution system for the factory before and after the factory equipment is started0、δ01Power consumption balance degree delta of station low-voltage power distribution systemt、δt1And calculating the contribution degree of the auxiliary power equipment to the balance of the auxiliary power.
3. The method for calculating the balance of the power plant auxiliary power system according to claim 2, wherein: step 1.2 influence factor phi of two-in-one operation mode of the gas-steam combined cycle unit on balance degree of auxiliary power0As shown in the following equation:
Figure FDA0003445276650000021
influence factor phi of one-to-one operation mode of gas-steam combined cycle unit on balance degree of auxiliary powertAs shown in the following equation:
Figure FDA0003445276650000022
wherein, U'i0Is a voltage Ui0Per unit value of, I'i0Is a current Ii0Per unit value of, P'i0Is a power Pi0The per-unit value of (c) is,
Figure FDA0003445276650000023
is a power factor
Figure FDA0003445276650000024
Per unit value of, U'i1Is a voltage Ui1Per unit value of, I'i1Is a current Ii1Per unit value of, P'i1Is a power Pi1The per-unit value of (c) is,
Figure FDA0003445276650000025
is a power factor
Figure FDA0003445276650000026
Per unit value of.
4. The method for calculating the balance of the power plant auxiliary power system according to claim 3, wherein: step 2.2, the power balance degree of the station high-voltage power distribution system is shown by the following formula:
Figure FDA0003445276650000027
wherein, delta0Is the power balance degree, U 'of a factory high-voltage power distribution system'hIs a voltage UhPer unit value of, I'hIs a current IhPer unit value of, P'hIs a power PhThe per-unit value of (c) is,
Figure FDA0003445276650000028
is a power factor
Figure FDA0003445276650000029
Per unit value of.
5. The method for calculating the balance of the power plant auxiliary power system according to claim 4, wherein: step 3.2 power utilization balance degree delta of station low-voltage power distribution systemtAs shown in the following equation:
Figure FDA0003445276650000031
wherein, U'lIs a voltage UlPer unit value of, I'lIs a current IlPer unit value of, PlIs at a power PlThe per-unit value of (c) is,
Figure FDA0003445276650000032
are respectively power factor
Figure FDA0003445276650000033
Per unit value of.
6. The method for calculating the balance of the power plant auxiliary power system according to claim 5, wherein: the specific method of the step 4.1 comprises the following steps:
acquiring voltage U of station service high-voltage distribution system before starting station service equipmenth0Current Ih0Power Ph0Power factor of the power converter
Figure FDA0003445276650000034
Voltage U of low-voltage power distribution system for factoryl0Current Il0Power Pl0Power factor of the power converter
Figure FDA0003445276650000035
Voltage U of station service high-voltage distribution system after station service equipment is startedh1Current Ih1Power Ph1Power factor of the power converter
Figure FDA0003445276650000036
System voltage U of low-voltage power distribution system for factoryl1Current Il1Power Pl1Power factor of the power converter
Figure FDA0003445276650000037
And respectively calculating the power balance degree delta of the high-voltage power distribution system for the factory before and after the starting of the factory equipment according to the system electric balance degree calculation methods in the step 2 and the step 30、δ01Power consumption balance degree delta of station low-voltage power distribution systemt、δt1。
7. The method for calculating the balance of the power plant auxiliary power system according to claim 6, wherein: the contribution degree of the auxiliary power equipment to the balance of the auxiliary power, which is calculated in the step 4.2, is shown in the following formula:
Figure FDA0003445276650000038
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114280385A (en) * 2021-12-30 2022-04-05 北京京能高安屯燃气热电有限责任公司 Service power three-phase voltage balance judgment method based on real-time monitoring

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114280385A (en) * 2021-12-30 2022-04-05 北京京能高安屯燃气热电有限责任公司 Service power three-phase voltage balance judgment method based on real-time monitoring
CN114280385B (en) * 2021-12-30 2023-12-26 北京京能高安屯燃气热电有限责任公司 Real-time monitoring-based station service three-phase voltage balance judging method

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