阅读说明：本技术 一种空冷调相机配套外冷阵列风机自动控制方法 (Automatic control method for external cooling array fan matched with air cooling phase modulator ) 是由 彭军 祁富志 李富荣 马涛 王正伟 祁元堂 徐元祥 徐嘉伟 周军 石生超 于 2021-08-11 设计创作，主要内容包括：本发明涉及风冷技术领域,具体地涉及一种空冷调相机配套的外冷阵列风机自动控制方法,所述的控制方法包括如下步骤：步骤1：对空冷调相机配套外冷阵列风机实行分组,得到阵列风机组；步骤2：对阵列风机组进行周期切换控制；步骤3：设定调相机外冷温度；步骤4：阵列风机组自动启/停控制；步骤5：自动控制过程中阵列风机组无扰切换控制。本发明降低电能消耗,保证了外冷换热容量的平滑调节。(2)各风机实现定期轮流工作,周期切换稳定。(3)实现了无忧切换和无人值守自动启停的技术。(The invention relates to the technical field of air cooling, in particular to an automatic control method of an external cooling array fan matched with an air cooling phase modulator, which comprises the following steps: step 1: grouping external cooling array fans matched with the air cooling cameras to obtain an array fan set; step 2: carrying out periodic switching control on the array fan set; and step 3: setting the external cooling temperature of the phase modifier; and 4, step 4: the array fan set is automatically controlled to start/stop; and 5: and in the automatic control process, the array fan set is subjected to undisturbed switching control. The invention reduces the electric energy consumption and ensures the smooth regulation of the external cooling heat exchange capacity. (2) The fans work in turn at regular intervals, and the periodic switching is stable. (3) The carefree switching and unattended automatic starting and stopping technology is realized.)

1. An automatic control method of an external cooling array fan matched with an air cooling phase modulator is characterized in that: the control method comprises the following steps:

step 1: grouping external cooling array fans matched with the air cooling cameras to obtain an array fan set;

step 2: carrying out periodic switching control on the array fan set;

and step 3: setting the external cooling temperature of the phase modifier;

and 4, step 4: the array fan set is automatically controlled to start/stop;

and 5: and in the automatic control process, the array fan set is subjected to undisturbed switching control.

2. The automatic control method of the external cooling array fan matched with the air-cooled phase modifier according to claim 1, characterized in that: in the step 1, the display fan units are divided into x groups of variable frequency fan units and y groups of power frequency fan units; the power frequency fan realizes the start/stop function, and the variable frequency fan realizes the remote operation of a variable speed instruction and the related function of power frequency;

the display fan unit is provided with single operation, group operation and general operation functions; the single operation realizes the operation of a single fan, and the group operation realizes the common operation function of all fans in the group; the general operation realizes the function of the same operation on all frequency conversion and power frequency fans.

3. The automatic control method of the external cooling array fan matched with the air-cooled phase modifier according to claim 1, characterized in that: and in the step 2, the periodic switching of the array fan unit is realized by adopting a periodic switching method of decoupling uninterrupted operation equipment.

4. The automatic control method of the external cooling array fan matched with the air-cooled phase modifier according to claim 3, characterized in that: the periodic switching method comprises the following steps:

s201, if each array fan unit has no fault and no switching failure, setting the running time of the fan unit;

s202, the periodic switching linkage of each fan unit is put into;

s204: if the running fan set reaches the set time, triggering a cycle switching instruction, starting the spare fan set, and then stopping the original running fan set;

if any operation of the steps S201 to S203 fails, the process is ended.

5. The automatic control method of the external cooling array fan matched with the air-cooled phase modifier according to claim 1, characterized in that: the specific operation of temperature setting in step 3 is as follows: determining an external cooling temperature source, under a normal condition, when the outlet water temperatures of two redundant coolers are not failed, adopting the outlet water temperatures of the coolers as external cooling control temperatures, and when the outlet water temperatures of the two coolers are failed and the temperatures of the three redundant phase-feeding modulators are not failed, adopting the inlet water temperatures as external cooling control temperatures; setting starting temperature and stopping temperature of the x groups of variable frequency fan sets and the y groups of power frequency fan sets;

the starting temperature is s, the stopping temperature is k, and the temperature is set as follows:

k1< S1< K2< S2< K3< S3< K4< S4< K5< S5< K6< S6 … … Kn < Sn, where n is the number of fan groups.

6. The automatic control method of the external cooling array fan matched with the air-cooled phase modifier according to claim 1, characterized in that: the automatic start/stop control strategy of the array fan unit is as follows:

the air cooling fan carries out automatic start/stop control on the group level fan according to the temperature of circulating cooling water, and the start/stop sequence is as follows along with the rise/fall of the temperature:

when the temperature is higher than a first preset value, starting a group of variable frequency fans to control until the temperature does not reach an expected fixed value after a variable frequency instruction reaches 50HZ, and then carrying out the next step;

when the external cooling temperature is greater than a second preset value, starting another group of variable frequency fans for control, and carrying out the next step when the temperature does not reach an expected fixed value after the variable frequency instruction reaches 50 Hz; and starting and stopping the X-th group of variable frequency fans and the y-th group of power frequency fans in sequence.

7. The automatic control method of the external cooling array fan matched with the air-cooling phase modifier according to the claim 5 or 6, characterized in that: and (3) checking the fixed value of the start-stop temperature: starting 2 groups of temperature, starting 1 group of temperature and stopping 2 groups of temperature; starting 2 groups of temperature > stopping 1 group of temperature > stopping 2 groups of temperature; the temperature constant values are required to be met at the same time, otherwise, the constant value is reported to be wrong, and the air cooler interlocking is quitted.

8. The automatic control method of the external cooling array fan matched with the air-cooled phase modifier according to claim 6, characterized in that: the external cooling fan is started first and stopped first.

9. The automatic control method of the external cooling array fan matched with the air-cooled phase modifier according to claim 6, characterized in that: and after the variable frequency fan runs or the fan unit is switched over or the fan unit is started due to the fact that the temperature reaches a starting condition with a fixed value, the PID is automatically put into use.

Technical Field

The invention relates to the technical field of air cooling, in particular to an automatic control method of an external cooling array fan matched with an air cooling phase modulator.

Background

With continuous planning and production operation of novel high-capacity phase modulators of power grids, the phase modulators which adopt closed air-cooling circulating cooling water for indirect air cooling become the best choice with excellent water-saving performance, and the external cooling systems of the phase modulators all adopt air cooling island array fans to cool the circulating cooling water. The operation of the power grid requires the large phase modulator to realize the unattended function, so that the automatic control system of the phase modulator needs to have high stability and low failure rate.

The phase modulation external cooling array fan based on the air cooling system configuration is controlled by matching a frequency conversion array and a power frequency array, and the traditional control strategy cannot meet the requirement. Because the array fan comprises a power frequency fan and a variable frequency adjusting fan, the array fan needs to be controlled in groups; how to realize the regular alternate work of each group of fans is also required to be correspondingly switched; how to realize the fault switching design of the variable frequency fan in the operation process is also a big difficulty; how the external cooling temperature setting value system is matched with the characteristics of unit load and ambient temperature also needs to carry out relevant mathematical modeling; key technologies such as how to realize undisturbed switching by an automatic control system in the switching process of each group of fans; the above technical problems all affect the automatic control level of such array fans.

Disclosure of Invention

In order to solve the difficult problems in the traditional control mode, the invention provides an automatic control method of a phase modulator external cooling array fan based on air cooling system configuration.

In order to achieve the purpose of the invention, the invention adopts the following control strategy:

an automatic control method for an external cooling array fan matched with an air cooling phase modulator comprises the following control strategies:

an automatic control method for an external cooling array fan matched with an air cooling phase modulator comprises the following steps:

step 1: grouping external cooling array fans matched with the air cooling cameras to obtain an array fan set;

step 2: carrying out periodic switching control on the array fan set;

and step 3: setting the external cooling temperature of the phase modifier;

and 4, step 4: the array fan set is automatically controlled to start/stop;

and 5: and in the automatic control process, the array fan set is subjected to undisturbed switching control.

Furthermore, in the step 1, the display fan units are divided into x groups of variable frequency fan units and y groups of power frequency fan units; the power frequency fan realizes the start/stop function, and the variable frequency fan realizes the remote operation of a variable speed instruction and the related function of power frequency;

the display fan unit is provided with single operation, group operation and general operation functions; the single operation realizes the operation of a single fan, and the group operation realizes the common operation function of all fans in the group; the general operation realizes the function of the same operation on all frequency conversion and power frequency fans.

Furthermore, the periodic switching control strategy of the array fan unit adopts a periodic switching method of decoupling uninterrupted operation equipment.

Further, the periodic switching method includes the following steps:

s201, if each array fan unit has no fault and no switching failure, setting the running time of the fan unit;

s202, the periodic switching linkage of each fan unit is put into;

s204: if the running fan set reaches the set time, triggering a cycle switching instruction, starting the standby fan set, and then stopping the original running fan set;

if any operation of the steps S201 to S203 fails, the process is ended.

Further, the step 4 of determining the external cold temperature source comprises the following steps: under normal conditions, when the outlet water temperatures of the two redundant coolers fail to be equal, the outlet water temperatures of the coolers are used as the external cooling control temperatures, and when the outlet water temperatures of the two coolers fail to be equal and the temperatures of the three redundant phase feeding compressors fail to be equal, the inlet water temperatures are used as the external cooling control temperatures; setting starting temperature and stopping temperature of the x groups of variable frequency fan sets and the y groups of power frequency fan sets;

the starting temperature is s, the stopping temperature is k, and the temperature is set as follows:

k1< S1< K2< S2< K3< S3< K4< S4< K5< S5< K6< S6 … … Kn < Sn, where n is the number of fan groups.

Further, the array fan set automatic start/stop control strategy,

the air cooling fan carries out automatic start/stop control on the group level fan according to the temperature of circulating cooling water, and the start/stop sequence is as follows along with the rise/fall of the temperature:

when the temperature is higher than a first preset value, starting a group of variable frequency fans to control until the temperature does not reach an expected fixed value after a variable frequency instruction reaches 50HZ, and then carrying out the next step;

when the external cooling temperature is greater than a second preset value, starting another group of variable frequency fans to control until the temperature does not reach an expected fixed value after the variable frequency instruction reaches 50Hz, and then carrying out the next step; and starting and stopping the X-th group of variable frequency fans and the y-th group of power frequency fans in sequence.

Further, the fixed value verification of the start-stop temperature: starting 2 groups of temperature, starting 1 group of temperature and stopping 2 groups of temperature; starting 2 groups of temperature > stopping 1 group of temperature > stopping 2 groups of temperature; the temperature constant values are required to be met at the same time, otherwise, the constant value is reported to be wrong, and the air cooler interlocking is quitted.

Furthermore, the external cooling fan is started first and stopped first.

Furthermore, after the frequency conversion fan runs, or the fan unit is switched over, or the fan unit is started due to the fact that the temperature reaches a starting condition with a fixed value, the PID is automatically put into use. .

Compared with the traditional position type PID control, the incremental PID control reduces the steady-state control precision, improves the stability of a control loop, effectively reduces the fault rate of an actuating mechanism and improves the intrinsic safety attribute of phase modulator equipment.

The invention has the following beneficial effects: (1) the electric energy consumption is reduced, and the smooth adjustment of the external cooling heat exchange capacity is ensured.

(2) The fans work in turn at regular intervals, and the periodic switching is stable.

(3) The carefree switching and unattended automatic starting and stopping technology is realized.

Detailed Description

The present invention will be described in further detail below to make the above objects, features and advantages of the present invention more apparent and understandable.

An automatic control method for an external cooling array fan matched with an air cooling phase modulator comprises the following steps:

step 1: grouping external cooling array fans matched with the air cooling cameras to obtain an array fan set;

step 2: carrying out periodic switching control on the array fan set;

and step 3: setting the external cooling temperature of the phase modifier;

and 4, step 4: the array fan set is automatically controlled to start/stop;

and 5: and in the automatic control process, the array fan set is subjected to undisturbed switching control.

Example 1

The array fan group level and level control method of the embodiment of the invention comprises the steps of firstly grouping the air-cooled array fans of the phase modulation machine, generally configuring a plurality of variable frequency fans and a plurality of power frequency fans for the phase modulation machine, and carrying out group control according to functions, generally dividing the variable frequency fans into x groups and dividing the power frequency fans into y groups for control.

The frequency conversion array fan unit is provided with single operation, group operation and general operation functions. The single operation is a remote operation function (comprising a power frequency and frequency conversion remote operation function) of a single fan, the power frequency realizes a start/stop function, and the frequency conversion realizes a speed change instruction remote operation and a power frequency related function; the group operation realizes the function of operating all the fans of the group together; the general operation realizes the same operation function on all the variable frequency fans. The frequency conversion array fan is provided with a manual input automatic and an automatic input automatic control function. In order to meet the requirement of unattended control, the variable frequency fan needs to realize an automatic input control function in the operation process. The power frequency array fan is provided with a single-stage and group-stage start/stop control function.

The array fan set level start/stop control method provided by the embodiment of the invention comprises the following steps: the air cooling fan carries out automatic start/stop control on the group level fan according to the temperature of circulating cooling water, and the start/stop sequence is as follows along with the rise/fall of the temperature:

the common frequency conversion stopping temperature is the frequency conversion starting temperature minus 2 ℃, and the power frequency stopping temperature is the power frequency starting temperature minus 5 ℃.

In this example, 6 groups of array fans are configured as an example, and the method includes 2 groups of variable frequency fans and 4 groups of industrial frequency fans for control.

Firstly, when the temperature is greater than a first preset value, starting a group of variable frequency fans to control until the temperature does not reach an expected fixed value after a variable frequency instruction reaches 50HZ, and then carrying out the next step;

further, when the external cooling temperature is greater than a second preset value, starting another set of variable frequency fan to control until the temperature does not reach an expected fixed value after the variable frequency instruction reaches 50Hz, and then performing the next step;

and further, when the external cooling temperature is higher than a third preset value, starting one group of power frequency fans of the first group/second group for control.

And further, when the external cooling temperature is higher than a fourth preset value, starting another group of the first/second groups of the industrial frequency fans for control.

And further, when the external cooling temperature is higher than a fifth preset value, starting one of the third/fourth groups of power frequency fans for control.

And further, when the external cooling temperature is higher than a sixth preset value, starting another third/fourth group of the industrial frequency fans for control.

The air cooler is divided into 6 groups, wherein 2 groups are frequency conversion controlled, and the other 4 groups are power frequency controlled.

The air cooler fan carries out start-stop control according to cooling water temperature, and along with the rising of temperature, the start-stop order strategy is as follows:

(1) one group of fans operates: throwing a first group or a second group of variable frequency fans;

(2) two groups of fans operate: throwing another group of variable frequency fans;

(3) three groups of fans operate: throwing a group of power frequency fans in the third group or the fourth group;

(4) four groups of fans operate: throwing another group of power frequency fans in the third group or the fourth group;

(5) five groups of fans operate: throwing a group of power frequency fans in the fifth group or the sixth group;

(6) six groups of fans operate: and throwing the other power frequency fan in the fifth group or the sixth group.

Note: the (3), (4), (5) and (6) can change correspondingly according to different temperature fixed values of the large groups of power frequency fans.

The first and second groups of fans (frequency conversion) are started and stopped first, and are controlled by turns and switched at regular time.

The third and the fourth groups of fans (power frequency) are started and stopped first, are controlled by turns and are switched at regular time.

The fifth and sixth groups of fans (power frequency) are started and stopped first, and are controlled by turns and switched at regular time.

Putting the whole large group into and out of the system; and the delay in the group is orderly put in and out.

And 2 fans in each group of power frequency fans are started and stopped in sequence by taking the power frequency fans as a group for delaying (3 s).

Under the automatic control mode, any frequency conversion fan in operation breaks down, all puts into the power frequency return circuit of this fan at once.

The target temperature of the variable-frequency fan is changed according to the number of the started power frequency fan sets, the starting temperature plus the compensation quantity are taken as the variable-frequency target temperature when the large power frequency set is started, the stopping temperature plus or minus the compensation quantity are taken as the variable-frequency target temperature when the large power frequency set is stopped, and the dead zone is the target temperature plus or minus 0.5 ℃. The compensation quantity is a correction quantity of a temperature set value formed by modeling according to the environment temperature of the current area.

External cooling temperature control source: under the normal condition, when the outlet water temperatures of the two redundant coolers are not equal in fault, the outlet water temperatures of the coolers are used as the external cooling control temperatures, and when the outlet water temperatures of the two coolers are equal in fault and the temperatures of the three redundant phase modulators are not equal in fault, the inlet water temperatures are used as the external cooling control temperatures.

And (3) checking the start-stop temperature fixed value:

first group, second group frequency conversion fan: starting 2 group temperature, starting 1 group temperature and stopping 2 group temperature

Starting 2 group temperature > stopping 1 group temperature > stopping 2 group temperature

Third group, fourth group power frequency fan: starting 2 group temperature, starting 1 group temperature and stopping 2 group temperature

Starting 2 group temperature > stopping 1 group temperature > stopping 2 group temperature

Fifth group, sixth group power frequency fan: starting 2 group temperature, starting 1 group temperature and stopping 2 group temperature

Starting 2 group temperature > stopping 1 group temperature > stopping 2 group temperature

The temperature constant values are required to be met at the same time, otherwise, the constant value is reported to be wrong, and the air cooler interlocking is quitted.

Example 2

The first group of fans (frequency conversion) start temperature is 28 ℃, the second group of fans (frequency conversion) start temperature is 32 ℃, the third group of fans start temperature is 35 ℃, the fourth group of fans start temperature is 37 ℃, the fifth group of fans start temperature is 39 ℃, the sixth group of fans start temperature is 41 ℃, the closed cooling tower start temperature is 42 ℃, the (frequency conversion stop temperature) frequency conversion start temperature is reduced by 2 ℃, and the (power frequency stop temperature) power frequency start temperature is reduced by 5 ℃ for illustration. The start-up temperature can be set.

Fan start and stop examples:

(1) a set of variable frequency starts: and (4) delaying for 2S to start the variable frequency fan at the temperature T of more than or equal to 28 ℃, and putting the whole set. Running for 80S at the lowest frequency of 20Hz, and after 80S, PID inputting, and running for 15 minutes at the target temperature of 28.5 ℃, T < 26 ℃ and the lowest frequency of 20Hz and stopping the variable frequency fan.

(2) Two groups of frequency conversion start: and (4) delaying for 75S to start the variable frequency fan at the temperature T of more than or equal to 32 ℃, and putting the whole set. When in frequency conversion input, all frequency conversion is sent to a fixed 25Hz to run for 30S, after 30S, PID input is carried out, the target temperature is 32.5 ℃, T is less than 30 ℃ and the lowest frequency is 20Hz to run for 15 minutes, and a group of frequency conversion fans are stopped.

(3) Starting a group of power frequency fans: and (4) delaying for 75S to start the power frequency fan at the temperature T of more than or equal to 35 ℃, and putting 2 fans at an interval of 3S each time. When the power frequency is put into the reactor, the reactor is fed with a variable frequency to a fixed 25Hz reactor for 30S, and after 30S, the reactor is PID put into the reactor, and the target temperature is 35.5 ℃.

And (4) delaying for 20S to stop the power frequency fan when T is less than 30 ℃, and withdrawing 2 fans every time at an interval of 3S. And (3) when the power frequency is withdrawn, the frequency is transmitted to the fixed 50Hz to run for 40S, after 40S, the PID is put into operation, and the target temperature is 32.5 ℃.

(4) Two groups of power frequency fans are started: t is more than or equal to 37 ℃, the power frequency fan is started after 75S delay, 2 fans are put in each time at an interval of 3S. When the power frequency is put into the reactor, the reactor is fed with a variable frequency and is operated at 25Hz for 30S, and after 30S, the reactor is put into the reactor with PID, and the target temperature is 37.5 ℃.

And (4) delaying for 20S to stop the power frequency fan when T is less than 32 ℃, and withdrawing 2 fans every time at an interval of 3S. And (3) when the power frequency is withdrawn, the frequency is transmitted to the fixed 50Hz to run for 40S, after 40S, the PID is put into operation, and the target temperature is 31.5 ℃.

(5) Three groups of power frequency fans are started: and (4) delaying for 20S to start the power frequency fan at the temperature T of more than or equal to 39 ℃, and putting 2 fans at an interval of 3S each time. When the power frequency is put into the reactor, the reactor is fed with a variable frequency to a fixed 25Hz reactor for 30S, and after 30S, the reactor is PID put into the reactor, and the target temperature is 38.5 ℃.

And (4) delaying for 20S to stop the power frequency fan when T is less than 34 ℃, and withdrawing 2 fans every time at an interval of 3S. And (3) when the power frequency is withdrawn, the frequency is transmitted to the fixed 50Hz to run for 40S, after 40S, the PID is put into operation, and the target temperature is 33.5 ℃.

(6) Four groups of power frequency fans are started: and (4) delaying for 20S to start the power frequency fan at the temperature T of more than or equal to 41 ℃, and putting 2 fans at an interval of 3S each time. When the power frequency is put into the reactor, the reactor is fed with a variable frequency to a fixed 25Hz reactor for 30S, and after 30S, the reactor is PID put into the reactor, and the target temperature is 40.5 ℃.

And (4) delaying for 20S to stop the power frequency fan when T is less than 36 ℃, and withdrawing 2 fans every time at an interval of 3S. And (3) when the power frequency is withdrawn, the frequency is transmitted to the fixed 50Hz to run for 40S, after 40S, the PID is put into operation, and the target temperature is 35.5 ℃.

The above-mentioned embodiments are intended to illustrate the technical problems, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention are included in the scope of the present invention.