CN117996602A - Energy management method based on flexible direct current converter station valve external cold water system - Google Patents
Energy management method based on flexible direct current converter station valve external cold water system Download PDFInfo
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- 238000001704 evaporation Methods 0.000 claims description 41
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Abstract
The invention discloses an energy management method based on a valve external cold water system of a flexible direct current converter station, which relates to the technical field of flexible direct current converter stations and comprises a valve external cold water system, a PLC (programmable logic controller), an industrial personal computer, an intelligent voltage control system, a system power distribution module and an intelligent temperature control system, wherein the PLC is electrically connected with the valve external cold water system, the industrial personal computer, the intelligent voltage control system and the intelligent temperature control system, a detection unit is arranged in the valve external cold water system, the intelligent temperature control system is used for detecting and stabilizing the temperature difference of the valve external cold water system, the industrial personal computer is used for displaying the detection value of the valve external cold water system data on a human-computer interface, the intelligent voltage control system is electrically connected with the valve external cold water system, the intelligent voltage control system is used for controlling the pressure difference of the valve external cold water system, the system power distribution module is electrically connected with the valve external cold water system, and the system power distribution module is used for providing power for the intelligent voltage control system and the intelligent temperature control system.
Description
Technical Field
The invention relates to the technical field of flexible direct current converter stations, in particular to an energy management method based on a cold water system outside a valve of a flexible direct current converter station.
Background
In recent years, the time of full-load operation of a flexible direct current converter station is continuously increased, the heat generated during the operation of a converter valve of the flexible direct current converter station is continuously increased, a water cooling system outside the flexible direct current converter station adopts a water spraying mode to cool converter valve equipment, and water can be largely evaporated in the process to cause the waste of water resources.
However, the water-saving measures of the traditional flexible direct-current converter station external cooling water system do not comprehensively consider the power of the external cooling water fan, the ambient temperature and the energy consumption of the water-saving device, the efficiency of the equipment cannot be fully exerted, and the energy waste is caused. It is therefore necessary to devise an energy management method based on a flexible direct current converter station valve external cooling water system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an energy management method based on a flexible direct current converter station valve external cold water system.
In order to achieve the above purpose, the invention is realized by the following technical scheme: an energy management method based on a flexible direct current converter station valve external cold water system comprises the following steps,
1) Collecting temperature information of cold water in a flexible direct current converter station, power of an external cold water fan and evaporation rate of the external cold water;
2) Calculating influence values of external cold water evaporation rates of the flexible direct current converter station under different internal cold water temperatures and external cold water fan powers, obtaining a corresponding relation between the actual external cold water evaporation rates and the internal cold water temperatures and the external cold water fan powers of the flexible direct current converter station, and constructing an external cold water evaporation rate, internal cold water temperature and external cold water fan power relation model;
3) Collecting power information of a water saver of an external cooling water system, output temperature information of the water saver, condensate water rate and water vapor temperature information;
4) Calculating the influence value of the steam temperature and the water saver power on the condensate water rate to obtain the corresponding relation between the actual condensate water rate and the water saver power and the steam temperature, and constructing a condensate water rate and water saver power relation model;
5) Obtaining a relation model among the temperature of the internal cooling water, the condensate water rate of the water economizer, the power of the water economizer and the power of the external cooling water fan according to the information;
6) And according to the aim that the condensate water rate is larger than the external cold water evaporation rate and the power consumption of the external cold water fan and the water economizer is minimum, adopting a model algorithm to control and solve the water economizer output power model by utilizing a differential evolution algorithm, and updating the water economizer output power in real time.
Preferably, said step 1) results in different internal cold water temperatures of the flexible direct current converter station And the external cold water evaporation rate E zq,Pmin under the power of the external cold water fan (P min,…,Pi,…,Pmax) is the minimum value of the power of the external cold water fan, P max is the maximum value of the power, P i is the power value at a certain moment,/>For the temperature of the internal cooling water when the converter station is stopped,/>Is the minimum value of the temperature of cold water in the converter station,/>Is the maximum value of the temperature of the internal cooling water,/>Is the cold water temperature in the converter station at a certain moment.
Preferably, in the step 2), the relation model expression of the external cold water evaporation rate and the internal cold water temperature of the flexible direct current converter station and the power of the external cold water fan is as follows:
wherein E zq is the temperature of the internal cooling water calculated according to the fitting model And when the power of the external cooling water fan is P i, the evaporation rate of external cooling water and K 1、K2、K3 are fitting parameters respectively.
Preferably, the step 3) obtains the temperature of the water vapor at different moments in the external cold water system of the flexible direct current converter stationAnd different economizer power/>A lower condensate rate (N min,…,Ni,…,Nmax); /(I)Is the minimum value of the water vapor temperature in the external cooling water system,/>For the temperature value of water vapor in the external cooling water system at a certain moment,/>The maximum value of the water vapor temperature of the external cooling water system at a certain moment; /(I)For the minimum power of the water-saving device, P i j is the power of the water-saving device at a certain moment,/>The maximum power of the water economizer; n min is the minimum value of the condensation rate of the water economizer, and N max is the maximum value of the condensation rate.
Preferably, the relationship between the external cold water evaporation rate and the external cold water vapor temperature is expressed as:
Preferably, the relation model expression between the condensed water rate and the steam temperature in the external cooling water system in the step 4) and the power of the water economizer is as follows:
Wherein N i is the steam temperature calculated according to the fitting model And when the power of the water economizer is P i j, the condensate water rate, K 4、K5、K6 is a fitting parameter, and L is an attribute coefficient of the water economizer equipment.
Preferably, the step 5) combines the three formulas to obtain the relationship among the temperature of the internal cold water, the condensate water rate of the water economizer, the power of the water economizer and the power of the external cold water fan as follows:
preferably, the specific steps of the step 6) are as follows:
61 Determining the temperature of cold water at various times of the day in a flexible direct current converter station External cold water fan power P min,…,Pi,…,Pmax, external cold water evaporation rate E zq, water economizer power/>The condensation rate of the water economizer is N min,…,Ni,…,Nmax;
62 Setting population scale, and generating a primary population according to constraint conditions;
63 According to the current moment flexible direct current converter station conveying load, calculating the power of the water economizer and the condensation rate of the water economizer, and carrying out iterative calculation on the current population based on the power and the condensation rate of the water economizer;
64 Performing mutation and selection differential evolution operation, and setting a mutation factor;
65 Judging and updating parent individuals and offspring individuals, and selecting more optimized individuals; iteration is performed, return to 63), and stop when the number of iterations reaches the set value.
Preferably, the initial population constraints generated in step 62) are:
Water economizer power constraint:
Outer cooling water fan power constraint:
0≤Pi≤Pmax
water economizer condensation rate constraint:
Nmin≤Ni≤Nmax
constraint between economizer condensation rate and external cold water evaporation rate:
Ni≥Ezq
The sum of E zq and N i is the smallest;
The constraint condition aims to obtain the minimum sum of the power of the external cold water fan and the power of the water economizer when the condensation rate of the water economizer is larger than the evaporation rate of external cold water.
The invention provides an energy management method based on a flexible direct current converter station valve external cold water system, which has the following beneficial effects:
1. The invention can fully exert the efficiency of equipment by comprehensively considering the information of the direct current transmission power, the ambient temperature, the power of the water economizer, the condensation rate of the water economizer and the like of the flexible direct current converter station, effectively reduce the water resource waste of the cold water system outside the flexible direct current converter station and improve the energy utilization rate;
2. Compared with the traditional water-saving mode, the invention can transmit power through the current flexible direct current converter station in advance, automatically adjust the power of the water-saving device in advance, realize the dynamic circulation of water resources of the cold water system outside the converter station, and improve the overall energy efficiency of the power system;
3. The energy management strategy and the method based on the flexible direct current converter station valve external cold water system have good expansibility and adaptability, and can be rapidly adapted to different running conditions by adjusting system parameters;
4. The invention can effectively reduce the operation and maintenance cost of the external cooling water system of the valve of the flexible direct current converter station and prolong the service life of equipment.
Detailed Description
Examples of the embodiments, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The following examples are illustrative and are intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention provides a technical scheme that: an energy management method based on a flexible direct current converter station valve external cold water system comprises the following steps:
step one: the method comprises the steps of collecting relevant parameters of a cold water system outside a flexible direct current converter station and information of a water saving device;
And collecting the power of the external cold water fan, the temperature value of the internal cold water and the evaporation rate data of the external cold water at each moment of the day of the flexible direct current convertor station, and carrying out standardized treatment on the values.
Step two: building a relationship model of the external cold water evaporation rate, the internal cold water temperature and the external cold water fan power;
for a flexible direct current converter station, the external cold water evaporation rate can be influenced by the internal cold water temperature, the power of an external cold water fan and the like, and the influences can be reflected on the external cold water evaporation rate laterally. Therefore, it is necessary to construct a model of the relationship between the external cold water evaporation rate and the internal cold water temperature, the external cold water fan power, which takes into account the influence of ambient temperature, pipeline materials, water quality.
Step three: collecting relevant information of a water economizer of a cold water system outside the converter station;
Collecting power information, condensate water rate, water vapor temperature and other information of a cold water economizer outside the converter station, and carrying out standardized treatment on the numerical value.
Step four: constructing a converter station external cold water economizer condensed water rate and economizer power relation model;
For a flexible direct current converter station, the water economizer condensate rate can be related to the economizer power, the economizer model characteristics and the like. Therefore, it is necessary to construct a model of the external cold water evaporation rate versus economizer power relationship that takes into account the effects of economizer power, steam temperature, economizer plant structural properties.
Step five: energy optimization scheme based on flexible direct current converter station valve external cold water system;
For cold water temperature in converter stations The data of the external cold water fan power P i, the external cold water evaporation rate E zq, the water economizer power P i j and the water economizer condensate water rate N i are subjected to multi-objective optimization design. The multi-objective optimization model aims at obtaining the minimum sum of the power of the external cooling water fan and the power of the water economizer when the condensation rate of the water economizer is larger than the evaporation rate of external cooling water, and the solving algorithm is a differential evolution algorithm.
The external cold water evaporation rate and the internal cold water temperature of the converter station and the external cold water fan power model mainly obtain a series of data such as the corresponding external cold water evaporation rate of the converter station under different internal cold water temperatures and external cold water fan powers through simulation calculation, model test, daily operation and dimension measurement and the like in the design process of the flexible direct-current external cold water system. And obtaining the relation between the actual external cold water evaporation rate and the power of the external cold water fan and the internal cold water temperature.
Obtaining the temperature of cold water in the flexible direct current converter station according to the dataExternal cold water evaporation rate E zq at different external cold water fan powers (P min,…,Pi,…,Pmax).
The corresponding relation is not expressed by a functional relation, and is unfavorable for energy optimization and regulation as a part of energy management of an external cold water system of a converter station valve, so that an empirical estimation model between an external cold water evaporation rate, an internal cold water temperature and an external cold water fan power can be obtained by fitting the data, and after the test, the model can be expressed as follows:
wherein E zq is the temperature of the internal cooling water calculated according to the fitting model The evaporation rate of the external cold water when the power of the external cold water fan is P i, and K 1、K2、K3 are fitting parameters respectively;
The relation model of the condensate water rate of the external cold water economizer of the convertor station and the power of the economizer is mainly obtained by a series of data such as the steam temperature, the economizer power, the condensate water rate of the economizer and the like at different moments through simulation calculation, model test and the like in the design process of the water economizer of the flexible direct-current external cold water system. And obtaining the relation among the actual water saving device condensate water rate, the water vapor temperature and the water saving device power.
According to the data, obtaining the temperature of water vapor at different moments in the external cold water system of the flexible direct current converter stationAnd different economizer power/>A lower condensate rate (N min,…,Ni,…,Nmax); /(I)Is the minimum value of the water vapor temperature in the external cooling water system,/>For the temperature value of water vapor in the external cooling water system at a certain moment,/>The maximum value of the water vapor temperature of the external cooling water system at a certain moment; /(I)For the minimum power of the water-saving device, P i j is the power of the water-saving device at a certain moment,/>The maximum power of the water economizer; n min is the minimum value of the condensation rate of the water economizer, and N max is the maximum value of the condensation rate.
The corresponding relation is not expressed by a functional relation, and is unfavorable for energy optimization regulation and control as a part of energy management of a water economizer of a cold water system outside a converter station valve, so that an empirical estimation model between the condensate water rate of the water economizer, the water vapor temperature and the power of the water economizer can be obtained by fitting the data, and after the test, the model can be expressed as follows:
Wherein N i is the steam temperature calculated according to the fitting model And when the power of the water economizer is P i j, the condensate water rate, K 4、K5、K6 is a fitting parameter, and L is an attribute coefficient of the water economizer equipment.
The relation among the condensate water rate of the water economizer, the power of the water economizer, the temperature of the internal cooling water and the power of the external cooling water fan can be obtained by combining the three types of the water economizer:
1) Determining cold water temperature at various times of day for a flexible direct current converter station External cold water fan power P min,…,Pi,…,Pmax, external cold water evaporation rate E zq, water economizer power/> The economizer condensation rate N min,…,Ni,…,Nmax.
2) Setting population scale, and generating a primary population according to constraint conditions;
3) Calculating the power of the water economizer and the condensation rate of the water economizer according to the load transmitted by the flexible direct current converter station at the current moment, and carrying out iterative calculation on the current population based on the power and the condensation rate of the water economizer;
4) Performing mutation and differential evolution selection operation, and setting a mutation factor;
4) Judging and updating parent individuals and offspring individuals, and selecting more optimized individuals; iterating, returning to 3), and stopping when the iteration times reach a set value;
preferably, the initial population constraints generated in step 2) are:
Water economizer power constraint:
Outer cooling water fan power constraint:
0≤Pi≤Pmax
water economizer condensation rate constraint:
Nmin≤Ni≤Nmax
constraint between economizer condensation rate and external cold water evaporation rate:
Ni≥Ezq
the sum of E zq and N i is the smallest
The constraint condition aims to obtain the minimum sum of the power of the external cold water fan and the power of the water economizer when the condensation rate of the water economizer is larger than the evaporation rate of external cold water.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (9)
1. An energy management method based on a flexible direct current converter station valve external cold water system is characterized by comprising the following steps of: comprises the steps of,
1) Collecting temperature information of cold water in a flexible direct current converter station, power of an external cold water fan and evaporation rate of the external cold water;
2) Calculating influence values of external cold water evaporation rates of the flexible direct current converter station under different internal cold water temperatures and external cold water fan powers, obtaining a corresponding relation between the actual external cold water evaporation rates and the internal cold water temperatures and the external cold water fan powers of the flexible direct current converter station, and constructing an external cold water evaporation rate, internal cold water temperature and external cold water fan power relation model;
3) Collecting power information of a water saver of an external cooling water system, output temperature information of the water saver, condensate water rate and water vapor temperature information;
4) Calculating the influence value of the steam temperature and the water saver power on the condensate water rate to obtain the corresponding relation between the actual condensate water rate and the water saver power and the steam temperature, and constructing a condensate water rate and water saver power relation model;
5) Obtaining a relation model among the temperature of the internal cooling water, the condensate water rate of the water economizer, the power of the water economizer and the power of the external cooling water fan according to the information;
6) And according to the aim that the condensate water rate is larger than the external cold water evaporation rate and the power consumption of the external cold water fan and the water economizer is minimum, adopting a model algorithm to control and solve the water economizer output power model by utilizing a differential evolution algorithm, and updating the water economizer output power in real time.
2. The energy management method based on the flexible direct current converter station valve external cold water system according to claim 1, wherein the energy management method comprises the following steps: the step 1) obtains different internal cooling water temperatures of the flexible direct current converter stationAnd the external cold water evaporation rate E zq,Pmin under the power of the external cold water fan (P min,…,Pi,…,Pmax) is the minimum value of the power of the external cold water fan, P max is the maximum value of the power, P i is the power value at a certain moment,/>For the temperature of the internal cooling water when the converter station is stopped,/>Is the minimum value of the temperature of cold water in the converter station,/>Is the maximum value of the temperature of the internal cooling water,/>Is the cold water temperature in the converter station at a certain moment.
3. The energy management method based on the flexible direct current converter station valve external cold water system according to claim 2, wherein the energy management method comprises the following steps: the relation model expression of the external cold water evaporation rate and the internal cold water temperature of the flexible direct current converter station and the power of the external cold water fan in the step 2) is as follows:
wherein E zq is the temperature of the internal cooling water calculated according to the fitting model And when the power of the external cooling water fan is P i, the evaporation rate of external cooling water and K 1、K2、K3 are fitting parameters respectively.
4. A method of energy management based on a flexible direct current converter station valve external cold water system according to claim 3, characterized by: the step 3) obtains the temperature of water vapor at different moments in the external cold water system of the flexible direct current converter stationAnd different economizer power/> A lower condensate rate (N min,…,Ni,…,Nmax); /(I)For the minimum value of the water vapor temperature in the external cooling water system, T i zheng is the water vapor temperature value in the external cooling water system at a certain moment,/>The maximum value of the water vapor temperature of the external cooling water system at a certain moment; /(I)For the minimum power of the water-saving device, P i j is the power of the water-saving device at a certain moment,/>The maximum power of the water economizer; n min is the minimum value of the condensation rate of the water economizer, and N max is the maximum value of the condensation rate.
5. The energy management method based on the flexible direct current converter station valve external cold water system according to claim 4, wherein the energy management method comprises the following steps: the relationship between the external cold water evaporation rate and the external cold water steam temperature is expressed as: e zq＝K4Ti zheng.
6. The energy management method based on the flexible direct current converter station valve external cold water system according to claim 5, wherein the energy management method comprises the following steps: the relation model expression between the condensed water rate in the step 4) and the steam temperature in the external cooling water system and the power of the water economizer is as follows:
Wherein N i is the steam temperature calculated according to the fitting model to be T i zheng, the condensed water rate when the power of the water economizer is P i j, K 4、K5、K6 is the fitting parameter, and L is the attribute coefficient of the water economizer equipment.
7. The energy management method based on the flexible direct current converter station valve external cold water system according to claim 6, wherein the energy management method comprises the following steps: the step 5) combines the three types to obtain the relationship among the temperature of the internal cold water, the condensate water rate of the water economizer, the power of the water economizer and the power of the external cold water fan, wherein the relationship is as follows:
8. The energy management method based on the flexible direct current converter station valve external cold water system according to claim 7, wherein the energy management method comprises the following steps: the specific steps of the step 6) are as follows:
61 Determining the temperature of cold water at various times of the day in a flexible direct current converter station External cold water fan power P min,…,Pi,…,Pmax, external cold water evaporation rate E zq, water economizer power/>…,Pi j,…,/>The condensation rate of the water economizer is N min,…,Ni,…,Nmax;
62 Setting population scale, and generating a primary population according to constraint conditions;
63 According to the current moment flexible direct current converter station conveying load, calculating the power of the water economizer and the condensation rate of the water economizer, and carrying out iterative calculation on the current population based on the power and the condensation rate of the water economizer;
64 Performing mutation and selection differential evolution operation, and setting a mutation factor;
65 Judging and updating parent individuals and offspring individuals, and selecting more optimized individuals; iteration is performed, return to 63), and stop when the number of iterations reaches the set value.
9. The energy management method based on the flexible direct current converter station valve external cold water system according to claim 8, wherein the energy management method comprises the following steps: the initial population constraints generated in step 62) are:
Water economizer power constraint:
Outer cooling water fan power constraint:
0≤Pi≤Pmax
water economizer condensation rate constraint:
Nmin≤Ni≤Nmax
constraint between economizer condensation rate and external cold water evaporation rate:
Ni≥Ezq
The sum of E zq and N i is the smallest;
The constraint condition aims to obtain the minimum sum of the power of the external cold water fan and the power of the water economizer when the condensation rate of the water economizer is larger than the evaporation rate of external cold water.
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| CN112672594A (en) * | 2020-11-27 | 2021-04-16 | 中国南方电网有限责任公司超高压输电公司广州局 | Method and system for predicting and monitoring inlet valve temperature of converter station valve cooling system |
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