CN103779860B - The control system of the active power in power plant and control method - Google Patents

Abstract

The invention discloses a system and a control method for controlling the active power of a power plant by a main station at the dispatching side of a power grid. The control system includes a first judging module, a second judging module, a third judging module and an active power control module. One judging module is used to judge whether the regional control deviation is greater than zero or less than zero, the second judging module is used to judge whether the regional control deviation is greater than zero or equal to zero and judges whether the active power of the hydrothermal power unit is reduced to the minimum value, and the third judging module uses To determine whether the regional control deviation is less than zero or equal to zero and determine whether the active power of the wind turbine has increased to the maximum value, the active power control module is used to increase or decrease the active power of the hydrothermal or wind turbine. The invention controls the increase and decrease of the active power of the wind power unit and the water-fired power unit and the processing priority, and can guarantee the full purchase of wind power to the greatest extent under the premise of ensuring the safety of the power grid.

Description

Active power control system and control method of power plant

technical field

The present invention relates to a control system and control method of active power of a power plant, in particular to a control system capable of controlling the sequence of increase and decrease of active power of wind turbines and water-fired generators in a wind farm and the use of the control system Implemented control method.

Background technique

Most of the existing wind farms are equipped with wind turbines and water-fired generators respectively. In the wind farms, the feeder lines of the wind farms are basically cut off to control the power delivered by the wind farms to the grid, so as to avoid the safety of the grid caused by excessive power. Problem, but this way it takes a long time for normal power delivery to resume after the feeder is cut. Another method is to set a planned value of the power to be delivered in advance, so that the wind farm can refer to the planned value at any time to perform operations, but this method is difficult to change once the planned value is set, resulting in very fixed execution Rigidity reduces the flexibility of active power processing of wind farms.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of long recovery time and reduced flexibility caused by cutting off the feeder of the wind farm in the wind farm or setting the planned value in advance to control the power transmission in the prior art, and to provide a A control system capable of controlling the sequence of increase and decrease of active power of wind turbines and water-fired turbines in a wind farm and a control method realized by the control system.

The present invention solves the above technical problems through the following technical solutions:

The present invention provides a control system for active power of a power plant, which is characterized in that the control system includes a first judgment module, a second judgment module, a third judgment module and an active power control module;

The first judging module is used to judge whether the regional control deviation is greater than zero or less than zero. If it is greater than zero, the active power control module is called to reduce the active power of the hydrothermal power unit, and then the second judging module is enabled. If it is less than zero, Then call the active power control module to increase the active power of the wind turbine, and then enable the third judgment module;

The second judging module is used to judge whether the regional control deviation is greater than zero or equal to zero and judge whether the active power of the hydrothermal power unit is reduced to the minimum value, if the regional control deviation is greater than zero and the active power of the hydrothermal power unit is not reduced to the minimum value , then call the active power control module to reduce the active power of the water-fired power unit, and then execute the judgment process of the second judgment module again. The active power control module reduces the active power of the wind turbine until the control deviation in this area is equal to zero, and if the control deviation in this area is equal to zero, no action is taken;

The third judging module is used to judge whether the regional control deviation is less than zero or equal to zero and judge whether the active power of the wind turbine has increased to the maximum value. If the regional control deviation is less than zero and the active power of the wind turbine has not increased to the maximum value, then Call the active power control module to increase the active power of the wind turbine, and then execute the judgment process of the third judgment module again. If the area control deviation is less than zero and the active power of the wind turbine increases to the maximum value, call the active power control module to increase the active power of the water-fired power unit until the control deviation in this area is equal to zero. If the control deviation in this area is equal to zero, no action will be taken.

The power delivered by the wind farm to the grid will have different requirements in different situations, and for a certain fixed power demand, when the power is transmitted, the actual delivered power and the fixed power demand can be compared in real time. In comparison, the difference between the two is the regional control deviation. When the regional control deviation is greater than zero, it means that the actual delivered power is greater than the fixed power demand. At this time, it is necessary to appropriately reduce the delivered active power. When the regional control deviation When it is less than zero, it means that the actual delivered power is less than the fixed power demand, and at this time, it is necessary to appropriately increase the delivered active power, and these are well-known technologies in the art, and will not be repeated here.

However, all the power control methods developed through AGC (Automatic Generation Control) software now only control the active power of the water and thermal power units of the wind farm, and there is basically no suitable control mode to control the active power of the wind power units. The present invention overcomes this technical defect, and can successfully control the active power of the wind turbine and the hydrothermal power unit respectively, and when it is necessary to increase the active power, the active power of the wind turbine will be increased first, and then the hydrothermal power will be increased. When the active power needs to be reduced, the active power of the water and thermal power unit should be reduced first, and the active power of the wind turbine should be reduced only when necessary. In this way, under the premise of ensuring the safety of the power grid and meeting the fixed power demand, the full purchase of wind power can be guaranteed to the greatest extent, and the long-term stable operation of the wind farm can be guaranteed.

Preferably, the control system is applied to an AGC (Automatic Generation Control) software platform.

The object of the present invention is to also provide a kind of control method of the active power of power plant, it is characterized in that, it utilizes above-mentioned control system to realize, and this control method comprises the following steps:

S _1. Judging whether the regional control deviation is greater than zero or less than zero, if greater than zero, execute step S ₂ , if less than zero, execute step S ₅ ;

S _2. Reduce the active power of the hydrothermal power unit;

S _3. Judging whether the control deviation in this area is greater than zero or equal to zero and judging whether the active power of the hydrothermal power unit has been reduced to the minimum value. If the control deviation in this area is greater than zero and the active power of the hydrothermal power unit has not been reduced to the minimum value, return to the step S ₂ , if the control deviation in this area is greater than zero and the active power of the water-fired power unit is reduced to the minimum value, then execute step S ₄ , if the control deviation in this area is equal to zero, then end the process;

S _4. Reduce the active power of the wind turbine until the control deviation in this area is equal to zero, and then end the process;

S _5. Increase the active power of the wind turbine;

S _6. Determine whether the control deviation in this area is less than zero or equal to zero and determine whether the active power of the wind turbine has increased to the maximum value. If the control deviation in this area is less than zero and the active power of the wind turbine has not increased to the maximum value, return to step S ₅ , if the control deviation in this area is less than zero and the active power of the wind turbine increases to the maximum value, execute step S ₇ , and if the control deviation in this area is equal to zero, end the process;

S7. Increase the active power of the water _- fired power unit until the control deviation in this area is equal to zero, and then end the process.

Preferably, the control method is applied to the AGC software platform.

The purpose of the present invention is to also provide a control system of active power of a power plant, which is characterized in that the control system includes a first judgment module, a second judgment module, a third judgment module, and a fourth judgment module and an active power control module;

The first judging module is used to judge whether the regional control deviation is greater than zero or less than zero. If it is greater than zero, the second judging module is enabled. If it is less than zero, an active power control module is called to increase the active power of the wind turbine, and then enabling a third judging module;

The second judging module is used to judge whether the regional control deviation is greater than a second threshold, and if so, invoke the active power control module to simultaneously reduce the active power of the hydrothermal power unit and the wind power unit until the regional control deviation is not greater than the first threshold. Two thresholds, then enable the fourth judging module, if not, call the active power control module to reduce the active power of the water and thermal power unit, and then enable the fourth judging module;

The fourth judging module is used for judging whether the regional control deviation is greater than zero or equal to zero and judging whether the active power of the hydrothermal power unit has been reduced to the minimum value, if the regional control deviation is greater than zero and the active power of the hydrothermal power unit has not been reduced to the minimum value , then call the active power control module to reduce the active power of the water-fired power unit, and then execute the judgment process of the fourth judgment module again. The active power control module reduces the active power of the wind turbine until the control deviation in this area is equal to zero, and if the control deviation in this area is equal to zero, no action is taken;

The third judging module is used to judge whether the regional control deviation is less than zero or equal to zero and judge whether the active power of the wind turbine has increased to the maximum value. If the regional control deviation is less than zero and the active power of the wind turbine has not increased to the maximum value, then Call the active power control module to increase the active power of the wind turbine, and then execute the judgment process of the third judgment module again. If the area control deviation is less than zero and the active power of the wind turbine increases to the maximum value, call the active power control module to increase the active power of the water-fired power unit until the control deviation in this area is equal to zero. If the control deviation in this area is equal to zero, no action will be taken.

In order to ensure the absolute safety of the power grid, a warning threshold for regional control deviation, that is, the second threshold, is set. If the regional control deviation exceeds the second threshold, it means that the actual power delivered has exceeded the warning threshold. In this way It will cause great harm to the power grid, so when controlling active power, we must try our best to prevent this from happening. Therefore, in the present invention, the second judging module is used to judge whether the regional control deviation is greater than the second threshold, thereby ensuring the safety of the power grid.

Preferably, the control system is applied to the AGC software platform.

The object of the present invention is to also provide a kind of control method of the active power of power plant, it is characterized in that, it utilizes above-mentioned control system to realize, and this control method comprises the following steps:

S _1. Determine whether the regional control deviation is greater than zero or less than zero, if it is greater than zero, execute step S ₂ , if it is less than zero, execute step S ₇ ;

S ₂ . Determine whether the regional control deviation is greater than the second threshold, if yes, execute step S ₃ , if not, execute step S ₄ ;

S _3. Reduce the active power of the water-fired power unit and the wind power unit at the same time, and return to step S ₂ ;

S _4. Reduce the active power of the hydrothermal power unit;

S _5. Judging whether the control deviation in this area is greater than zero or equal to zero and judging whether the active power of the hydrothermal power unit has been reduced to the minimum value. If the control deviation in this area is greater than zero and the active power of the hydrothermal power unit has not been reduced to the minimum value, return to the step S ₄ , if the control deviation in this area is greater than zero and the active power of the water-fired power unit is reduced to the minimum value, then execute step S ₆ , if the control deviation in this area is equal to zero, then end the process;

S _6. Reduce the active power of the wind turbine until the control deviation in this area is equal to zero, and then end the process;

S _7. Increase the active power of the wind turbine;

S _8. Judging whether the control deviation in this area is less than zero or equal to zero and judging whether the active power of the wind turbine has increased to the maximum value. If the control deviation in this area is less than zero and the active power of the wind turbine has not increased to the maximum value, return to step S ₇ , if the control deviation in this area is less than zero and the active power of the wind turbine increases to the maximum value, then execute step S ₉ , if the control deviation in this area is equal to zero, then end the process;

_S9 . Increase the active power of the water-fired power unit until the control deviation in this area is equal to zero, and then end the process.

Preferably, the control method is applied to the AGC software platform.

The purpose of the present invention is to also provide a control system of active power of a power plant, which is characterized in that the control system includes a first judgment module, a second judgment module, a third judgment module, and a fourth judgment module and an active power control module;

The first judging module is used to judge whether the absolute value of the regional control deviation is greater than a first threshold, if yes, enable the second judging module, if not, take no action;

The second judging module is used to judge whether the regional control deviation is greater than zero or less than zero. If it is greater than zero, then call the active power control module to reduce the active power of the hydrothermal power unit, and then enable the third judging module. If it is less than zero , then call the active power control module to increase the active power of the wind turbine, and then enable the fourth judgment module;

The third judging module is used to judge whether the regional control deviation is greater than the first threshold and judge whether the active power of the hydrothermal power unit has been reduced to a minimum value. If the regional control deviation is greater than the first threshold and the active power of the hydrothermal power unit is not is reduced to the minimum value, then call the active power control module to reduce the active power of the hydrothermal power unit, and then execute the judgment process of the third judgment module again, if the regional control deviation is greater than the first threshold and the active power of the hydrothermal power unit Reduce to the minimum value, then call the active power control module to reduce the active power of the wind turbine until the regional control deviation is not greater than the first threshold, if the regional control deviation is not greater than the first threshold, no action is taken;

The fourth judging module is used to judge whether the absolute value of the regional control deviation is greater than the first threshold and judge whether the active power of the wind turbine has increased to the maximum value, if the absolute value of the regional control deviation is greater than the first threshold and the wind turbine If the active power of the wind turbine has not increased to the maximum value, the active power control module is called to increase the active power of the wind turbine, and then the judgment process of the fourth judgment module is executed again, if the absolute value of the regional control deviation is greater than the first threshold and When the active power of the wind turbine increases to the maximum value, the active power control module is invoked to increase the active power of the hydrothermal power unit until the absolute value of the control deviation in this area is not greater than the first threshold. If the absolute value of the control deviation in this area is not If it is greater than the first threshold, no action is taken.

In order to avoid adjusting the active power of the wind farm too frequently, the first threshold is set, which is a range of allowable fluctuations in the regional control deviation. In this way, as long as the regional control deviation is within this range, it means that the power The transmission can basically meet the demand, and there is no need to adjust the active power of the wind farm at this time.

Preferably, the control system is applied to the AGC software platform.

The object of the present invention is to also provide a kind of control method of the active power of power plant, it is characterized in that, it utilizes above-mentioned control system to realize, and this control method comprises the following steps:

S _1. Determine whether the absolute value of the regional control deviation is greater than the first threshold, if yes, execute step S ₂ , if not, end the process;

S _2. Judging whether the control deviation in this area is greater than zero or less than zero, if it is greater than zero, execute step S ₃ , if it is less than zero, execute step S ₆ ;

S _3. Reduce the active power of the hydrothermal power unit;

S _4. Judging whether the regional control deviation is greater than the first threshold and judging whether the active power of the hydrothermal power unit has been reduced to the minimum value, if the regional control deviation is greater than the first threshold and the active power of the hydrothermal power unit has not been reduced to the minimum value , then return to step S ₃ , if the regional control deviation is greater than the first threshold and the active power of the hydrothermal power unit is reduced to the minimum value, then execute step S ₅ , if the regional control deviation is not greater than the first threshold, then end the process ;

S _5. Reduce the active power of the wind turbine until the control deviation in this area is not greater than the first threshold, and then end the process;

S _6. Increase the active power of the wind turbine;

S _7. Judging whether the absolute value of the regional control deviation is greater than the first threshold and judging whether the active power of the wind turbine has increased to the maximum value, if the absolute value of the regional control deviation is greater than the first threshold and the active power of the wind turbine is not increase to the maximum value, then return to step S ₆ , if the absolute value of the regional control deviation is greater than the first threshold and the active power of the wind turbine increases to the maximum value, then perform step S ₈ , if the absolute value of the regional control deviation is not greater than the first threshold, the process ends;

S ₈ . Increase the active power of the water-fired power unit until the absolute value of the control deviation in this area is not greater than the first threshold, and then end the process.

Preferably, the control method is applied to the AGC software platform.

The purpose of the present invention is to also provide a control system of active power of a power plant, which is characterized in that the control system includes a first judgment module, a second judgment module, a third judgment module, and a fourth judgment module , a fifth judging module and an active power control module;

The first judging module is used to judge whether the absolute value of the regional control deviation is greater than a first threshold, if yes, enable the second judging module, if not, take no action;

The second judging module is used to judge whether the regional control deviation is greater than zero or less than zero, if it is greater than zero, the third judging module is enabled, and if it is less than zero, the active power control module is called to increase the active power of the wind turbine, Then enable the fourth judging module;

The third judging module is used to judge whether the regional control deviation is greater than a second threshold, and if so, call the active power control module to reduce the active power of the hydrothermal power unit and the wind power unit at the same time until the regional control deviation is not greater than the second threshold Two thresholds, then enable the fifth judging module, if not, call the active power control module to reduce the active power of the water and thermal power unit, and then enable the fifth judging module;

The fifth judging module is used for judging whether the regional control deviation is greater than the first threshold and judging whether the active power of the hydrothermal power unit has been reduced to a minimum value, if the regional control deviation is greater than the first threshold and the active power of the hydrothermal power unit is not Reduced to the minimum value, then call the active power control module to reduce the active power of the hydrothermal power unit, and then execute the judgment process of the fifth judgment module again, if the regional control deviation is greater than the first threshold and the active power of the hydrothermal power unit Reduce to the minimum value, then call the active power control module to reduce the active power of the wind turbine until the regional control deviation is not greater than the first threshold, if the regional control deviation is not greater than the first threshold, no action is taken;

The fourth judging module is used to judge whether the absolute value of the regional control deviation is greater than the first threshold and judge whether the active power of the wind turbine has increased to the maximum value, if the absolute value of the regional control deviation is greater than the first threshold and the wind turbine If the active power of the wind turbine has not increased to the maximum value, the active power control module is called to increase the active power of the wind turbine, and then the judgment process of the fourth judgment module is executed again, if the absolute value of the regional control deviation is greater than the first threshold and When the active power of the wind turbine increases to the maximum value, the active power control module is invoked to increase the active power of the hydrothermal power unit until the absolute value of the control deviation in this area is not greater than the first threshold. If the absolute value of the control deviation in this area is not If it is greater than the first threshold, no action is taken.

Preferably, the control system is applied to the AGC software platform.

The object of the present invention is to also provide a kind of control method of the active power of power plant, it is characterized in that, it utilizes above-mentioned control system to realize, and this control method comprises the following steps:

S ₁ . Judging whether the absolute value of the control deviation in the area is greater than a first threshold, if yes, execute step S ₂ , if not, end the process;

S _2. Judging whether the control deviation in this area is greater than zero or less than zero, if it is greater than zero, execute step S ₃ , if it is less than zero, execute step S ₈ ;

S ₃ . Determine whether the regional control deviation is greater than a second threshold, if yes, execute step S ₄ , if not, execute step S ₅ ;

S _4. Reduce the active power of the water-fired power unit and the wind power unit at the same time, and then return to step S ₃ ;

S _5. Reduce the active power of the hydrothermal power unit;

S _6. Judging whether the regional control deviation is greater than the first threshold and judging whether the active power of the hydrothermal power unit has been reduced to the minimum value, if the regional control deviation is greater than the first threshold and the active power of the hydrothermal power unit has not been reduced to the minimum value , then return to step S ₅ , if the regional control deviation is greater than the first threshold and the active power of the hydrothermal power unit is reduced to the minimum value, then execute step S ₇ , if the regional control deviation is not greater than the first threshold, then end the process ;

S _7. Reduce the active power of the wind turbine until the control deviation in this area is not greater than the first threshold, and then end the process;

S _8. Increase the active power of the wind turbine;

_S9 . Judging whether the absolute value of the regional control deviation is greater than the first threshold and judging whether the active power of the wind turbine has increased to the maximum value, if the absolute value of the regional control deviation is greater than the first threshold and the active power of the wind turbine is not increase to the maximum value, then return to step S ₈ , if the absolute value of the regional control deviation is greater than the first threshold and the active power of the wind turbine has increased to the maximum value, then perform step S ₁₀ , if the absolute value of the regional control deviation is not greater than the first threshold, the process ends;

S ₁₀ . Increase the active power of the water-fired power unit until the absolute value of the control deviation in this area is not greater than the first threshold, and then end the process.

Preferably, the control method is applied to the AGC software platform.

The positive progress effect of the present invention is that: the present invention can respectively control the increase and decrease of the active power of the wind power unit and the water-fired power unit and the priority order of processing, thereby avoiding too frequent adjustment of the active power of the wind farm, and being able to Under the premise of ensuring the safety of the power grid and meeting the fixed power demand, it can guarantee the full purchase of wind power to the greatest extent and ensure the long-term stable operation of the wind farm.

Description of drawings

Fig. 1 is a structural diagram of an active power control system of a power plant according to a first embodiment of the present invention.

Fig. 2 is a flowchart of a method for controlling active power of a power plant according to a first embodiment of the present invention.

Fig. 3 is a structural diagram of an active power control system of a power plant according to a second embodiment of the present invention.

Fig. 4 is a flowchart of a method for controlling active power of a power plant according to a second embodiment of the present invention.

Fig. 5 is a structural diagram of an active power control system of a power plant according to a third embodiment of the present invention.

Fig. 6 is a flowchart of a method for controlling active power of a power plant according to a third embodiment of the present invention.

Fig. 7 is a structural diagram of an active power control system of a power plant according to a fourth embodiment of the present invention.

Fig. 8 is a flowchart of a method for controlling active power of a power plant according to a fourth embodiment of the present invention.

detailed description

The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.

First embodiment:

As shown in Figure 1, the control system of the active power of the power plant of the present embodiment comprises a first judging module 1, a second judging module 2, a third judging module 3, a fourth judging module 4, a fifth judging module A judgment module 5 and an active power control module 6 .

The first judging module 1 first judges whether the absolute value of the regional control deviation A is greater than a first threshold B, if yes, activates the second judging module 2, and if not, does not perform any operation.

In order to avoid too frequent adjustment of the active power of the wind farm, the first threshold B is preset. As long as the absolute value of the regional control deviation A does not exceed the first threshold B, it means that the power transmission can basically meet the requirements. At this time, there is no need to adjust the active power delivered by the wind farm. Only when the absolute value of the regional control deviation A exceeds the first threshold B, the active power of the wind farm is adjusted and controlled, and finally the regional control deviation A is controlled within an allowable fluctuation range.

If the first judging module 1 judges that the absolute value of the regional control deviation A is greater than the first threshold B, it means that the active power of the wind farm needs to be controlled. At this time, the second judging module 2 will judge that the regional control Whether the deviation A is greater than zero or less than zero. If it is greater than zero, the third judging module 3 is enabled. If it is less than zero, it means that the actual power delivered is less than the power demand of the grid. At this time, the active power control module 6 can be called to Increase the active power of the wind turbine, and then activate the fourth judging module 4 .

In order to ensure the absolute safety of the power grid, a warning threshold is set for the regional control deviation A, that is, a second threshold C. If the regional control deviation A exceeds the second threshold C, it means that the actual power delivered is far away. Far beyond the power demand of the grid, this will cause great harm to the grid, and the grid at this time will be very unsafe.

Therefore, when the second judging module 2 judges that the regional control deviation A is greater than zero, it means that the actual power delivered at this time is greater than the power demand of the power grid. Therefore, in order to ensure the safety of the power grid, the third judging module 3 is first enabled. Judging whether the regional control deviation A is greater than the second threshold C, if so, it means that the actual power delivered is too large, and at this time it is necessary to quickly reduce the active power of the wind farm. The specific method is to call the active power control module 6 to simultaneously Reduce the active power of the water-fired power unit and the wind power unit until the regional control deviation A is not greater than the second threshold C, and then enable the fifth judgment module 5, if not, it means that although the actual output power is greater than the power demand of the grid, However, it will not endanger the safety of the power grid. At this time, the active power of the wind farm can be slowly and accurately reduced. In order to ensure that the wind power can be purchased in full, the active power control module 6 is called to prioritize the reduction of hydrothermal power. active power of the unit, and then enable the fifth judging module 5 .

The fifth judging module 5 will judge whether the regional control deviation A is greater than the first threshold B and judge whether the active power of the hydrothermal power unit is reduced to the minimum value, if the regional control deviation A is greater than the first threshold B and the hydrothermal power If the active power of the unit is not reduced to the minimum value, it means that the active power of the wind farm needs to continue to decrease, and the active power of the water and thermal power unit can also continue to decrease. At this time, the active power control module 6 can be called to continue to reduce the water. Then execute the judging process of the fifth judging module 5 again. If the regional control deviation A is greater than the first threshold B and the active power of the hydrothermal power unit is reduced to the minimum value, it means that the water and thermal power unit can no longer be reduced. The active power of the thermal power unit can only call the active power control module 6 to reduce the active power of the wind turbine until the regional control deviation A is not greater than the first threshold B, if the regional control deviation A is not greater than the first threshold B A threshold value B means that the transmission of active power of the wind farm can basically meet the power demand of the grid, and no follow-up action can be taken at this time.

And when the second judging module 2 judges that the regional control deviation A is less than zero, it means that the actual power delivered is less than the power demand of the grid. At this time, it is necessary to increase the active power of the wind farm. , at this time, the active power control module 6 will be called to give priority to increasing the active power of the wind turbine, and then the fourth judging module 4 will be enabled.

The fourth judging module 4 will judge whether the absolute value of the regional control deviation A is greater than the first threshold B and judge whether the active power of the wind turbine has increased to the maximum value, if the absolute value of the regional control deviation A is greater than the first Threshold B and the active power of the wind turbine has not increased to the maximum value, it means that the active power of the wind farm needs to continue to increase, and the active power of the wind turbine can continue to increase, then the active power control module 6 will be called at this time to Continue to increase the active power of the wind turbine, and then execute the judgment process of the fourth judgment module 4 again. If the absolute value of the regional control deviation A is greater than the first threshold B and the active power of the wind turbine has increased to the maximum value, it means that The active power of the wind turbine can no longer be increased. At this time, the active power control module 6 can only be called to increase the active power of the hydrothermal power unit until the absolute value of the control deviation A in this area is not greater than the first threshold B. If the area If the absolute value of the control deviation A is not greater than the first threshold B, it means that the transmission of active power of the wind farm can basically meet the power demand of the power grid, and no subsequent action can be taken at this time.

Among them, the control system can be applied to the AGC software platform, and through the various parts of the control system to execute operations successively, it is possible to give priority to increasing the active power of the wind turbine when the active power of the wind farm needs to be increased, and to reduce the wind power when the wind power needs to be reduced. When reducing the active power of the farm, the priority is to reduce the active power of the hydrothermal power unit. In this way, on the premise of ensuring the safety of the power grid, the full acquisition of wind power can be guaranteed to the greatest extent, and the long-term stable operation of the wind farm can be guaranteed.

As shown in Figure 2, the present invention utilizes the control system of the active power of the power plant of the present embodiment to realize the control method of the active power of the power plant comprising the following steps:

Step 100 , judging whether the absolute value A of the regional control deviation is greater than a first threshold B, if yes, execute step 101 , if not, end the process.

Step 101, judging whether the regional control deviation A is greater than zero or less than zero, if greater than zero, perform step 102, and if less than zero, perform step 107.

Step 102 , judging whether the regional control deviation A is greater than a second threshold C, if yes, execute step 103 , if not, execute step 104 .

Step 103 , reduce the active power of the water-fired power unit and the wind power unit at the same time, and then return to step 102 .

Step 104, reducing the active power of the water-fired power unit.

Step 105, judging whether the regional control deviation A is greater than the first threshold B and judging whether the active power of the hydrothermal power unit has been reduced to a minimum value, if the regional control deviation A is greater than the first threshold B and the active power of the hydrothermal power unit is not Reduce to the minimum value, then return to step 104, if the regional control deviation A is greater than the first threshold B and the active power of the water-fired power unit is reduced to the minimum value, then perform step 106, if the regional control deviation A is not greater than the first threshold B threshold B, the process ends.

Step 106 , reducing the active power of the wind turbine until the regional control deviation A is not greater than the first threshold B, and then the process ends.

Step 107, increasing the active power of the wind turbine.

Step 108, judging whether the absolute value of the regional control deviation A is greater than the first threshold B and judging whether the active power of the wind turbine has increased to the maximum value, if the absolute value of the regional control deviation A is greater than the first threshold B and the wind turbine The active power of the wind turbine has not increased to the maximum value, then return to step 107, if the absolute value of the regional control deviation A is greater than the first threshold B and the active power of the wind turbine has increased to the maximum value, then perform step 109, if the regional control deviation If the absolute value of A is not greater than the first threshold B, the process ends.

Step 109: Increase the active power of the water-fired power unit until the absolute value of the regional control deviation A is not greater than the first threshold B, and then end the process.

Second embodiment:

As shown in Figure 3, the control system of the active power of the power plant of the present embodiment comprises a first judging module 10, a second judging module 20, a third judging module 30, a fourth judging module 40 and an active power The control module 60, the difference between this embodiment and the first embodiment is that in this embodiment, when the regional control deviation A is greater than zero and greater than the first threshold B, no longer continue to judge whether the regional control deviation A is greater than the second Threshold C, and directly invoke the active power control module 60 to reduce the active power of the hydrothermal power unit, and the rest of the comparison judgment, operation execution, etc. are the same as the first embodiment.

As shown in Figure 4, the present invention utilizes the active power control system of the power plant of the present embodiment to realize the control method of the active power of the power plant comprising the following steps:

Step 200 , judging whether the absolute value of the regional control deviation A is greater than the first threshold B, if yes, execute step 201 , if not, end the process.

Step 201, judging whether the regional control deviation A is greater than zero or less than zero, if greater than zero, perform step 202, and if less than zero, perform step 205.

Step 202, reducing the active power of the water-fired power unit.

Step 203, judging whether the regional control deviation A is greater than the first threshold B and judging whether the active power of the hydrothermal power unit has been reduced to a minimum value, if the regional control deviation A is greater than the first threshold B and the active power of the hydrothermal power unit is not Reduce to the minimum value, then return to step 202, if the regional control deviation A is greater than the first threshold B and the active power of the water-fired power unit is reduced to the minimum value, then perform step 204, if the regional control deviation A is not greater than the first threshold B threshold B, the process ends.

Step 204: Reduce the active power of the wind turbine until the control deviation A of this area is not greater than the first threshold B, and then end the process.

Step 205, increase the active power of the wind turbine.

Step 206, judging whether the absolute value of the regional control deviation A is greater than the first threshold B and judging whether the active power of the wind turbine has increased to the maximum value, if the absolute value of the regional control deviation A is greater than the first threshold B and the wind turbine If the active power of the wind turbine has not increased to the maximum value, return to step 205. If the absolute value of the regional control deviation A is greater than the first threshold B and the active power of the wind turbine has increased to the maximum value, then perform step 207. If the regional control deviation If the absolute value of A is not greater than the first threshold B, the process ends.

Step 207: Increase the active power of the water-fired power unit until the absolute value of the control deviation A in this area is not greater than the first threshold B, and then end the process.

Third embodiment:

As shown in Figure 5, the control system of the active power of the power plant of the present embodiment comprises a first judging module 11, a second judging module 21, a third judging module 31, a fourth judging module 41 and an active power The control module 61, the difference between this embodiment and the first embodiment is that in this embodiment, a range of allowable fluctuations is no longer set for the regional control deviation A, that is, in the specific implementation process, the regional control deviation A does not Then compare it with the first threshold B, and directly compare it with zero, that is, only when the control deviation A of the area is equal to zero, the control and regulation of the active power of the wind farm will be stopped, instead of the first implementation In this example, as long as the absolute value of the regional control deviation A is not greater than the first threshold B, the active power of the wind farm will not be controlled.

As shown in FIG. 6, the present invention utilizes the control method of the active power of the power plant realized by the control system of the active power of the power plant of this embodiment comprising the following steps:

Step 300 , judging whether the regional control deviation A is greater than zero or less than zero, if greater than zero, perform step 301 , and if less than zero, perform step 306 .

Step 301 , judging whether the regional control deviation A is greater than the second threshold C, if yes, execute step 302 , if not, execute step 303 .

Step 302 , reduce the active power of the water-fired power unit and the wind power unit at the same time, and return to step 301 .

Step 303, reducing the active power of the water-fired power unit.

Step 304, judging whether the regional control deviation A is greater than zero or equal to zero and judging whether the active power of the hydrothermal power unit has been reduced to the minimum value, if the regional control deviation A is greater than zero and the active power of the hydrothermal power unit has not been reduced to the minimum value, then Returning to step 303, if the regional control deviation A is greater than zero and the active power of the water-fired power unit is reduced to the minimum value, then perform step 305, and if the regional control deviation A is equal to zero, then end the process.

Step 305: Reduce the active power of the wind turbine until the control deviation A in this area is equal to zero, and then end the process.

Step 306, increase the active power of the wind turbine.

Step 307, judge whether the control deviation A of the area is less than zero or equal to zero and determine whether the active power of the wind turbine has increased to the maximum value, if the control deviation A of the area is less than zero and the active power of the wind turbine has not increased to the maximum value, return to step 306. If the regional control deviation A is less than zero and the active power of the wind turbine increases to the maximum value, execute step 308. If the regional control deviation A is equal to zero, the process ends.

Step 308: Increase the active power of the water-fired power unit until the control deviation A in this area is equal to zero, and then end the process.

Fourth embodiment:

As shown in FIG. 7 , the active power control system of the power plant in this embodiment includes a first judging module 12 , a second judging module 22 , a third judging module 32 and an active power control module 62 . The difference between this embodiment and the first embodiment is that in this embodiment, the regional control deviation A is no longer compared with the first threshold B and the second threshold C, and as long as the regional control deviation A is greater than zero, the wind farm will be reduced. Active power, as long as the regional control deviation A is less than zero, the active power of the wind farm will be increased, and only when the regional control deviation A is equal to zero, the regulation and control of the active power of the wind farm will be stopped.

As shown in Figure 8, the present invention utilizes the active power control system of the power plant of this embodiment to realize the control method of the active power of the power plant comprising the following steps:

Step 400 , judging whether the regional control deviation A is greater than zero or less than zero, if greater than zero, perform step 401 , and if less than zero, perform step 404 .

Step 401, reducing the active power of the water-fired power unit.

Step 402, judge whether the regional control deviation A is greater than zero or equal to zero and determine whether the active power of the hydrothermal power unit has been reduced to the minimum value, if the regional control deviation A is greater than zero and the active power of the hydrothermal power unit has not been reduced to the minimum value, then Returning to step 401, if the regional control deviation A is greater than zero and the active power of the water-fired power unit is reduced to the minimum value, then execute step 403, and if the regional control deviation A is equal to zero, the process ends.

Step 403: Reduce the active power of the wind turbine until the control deviation A in this area is equal to zero, and then end the process.

Step 404, increasing the active power of the wind turbine.

Step 405, judge whether the control deviation A of the area is less than zero or equal to zero and determine whether the active power of the wind turbine has increased to the maximum value, if the control deviation A of the area is less than zero and the active power of the wind turbine has not increased to the maximum value, return to step 404. If the regional control deviation A is less than zero and the active power of the wind turbines increases to the maximum value, execute step 406. If the regional control deviation A is equal to zero, the process ends.

Step 406: Increase the active power of the water-fired power unit until the control deviation A in this area is equal to zero, and then end the process.

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (16)

1. a control system for the active power in power plant, is characterized in that, this control system comprises one first judge module, one second judge module, one the 3rd judge module and an active power controller module;

This first judge module is used for judging area control deviation and is greater than zero or be less than zero, if be greater than zero, then call this active power controller module to reduce the active power of Hydro-Thermal Systems unit, then this second judge module is enabled, if be less than zero, then call this active power controller module to increase the active power of Wind turbines, then enable the 3rd judge module;

This second judge module is for judging that this district control deviation is greater than zero or equal zero and judge whether the active power of Hydro-Thermal Systems unit reduces to minimum value, if this district control deviation is greater than zero and the active power of Hydro-Thermal Systems unit does not reduce to minimum value, then call this active power controller module to reduce the active power of Hydro-Thermal Systems unit, and then perform the judgement flow process of this second judge module, if this district control deviation is greater than zero and the active power of Hydro-Thermal Systems unit reduces to minimum value, then call this active power controller module to reduce the active power of Wind turbines, until this district control deviation equals zero, if this district control deviation equals zero, then do not do action,

3rd judge module is for judging that this district control deviation is less than zero or equal zero and judge whether the active power of Wind turbines is increased to maximum, if this district control deviation is less than zero and the active power of Wind turbines is not increased to maximum, then call this active power controller module to increase the active power of Wind turbines, and then perform the judgement flow process of the 3rd judge module, if this district control deviation is less than zero and the active power of Wind turbines is increased to maximum, then call this active power controller module to increase the active power of Hydro-Thermal Systems unit, until this district control deviation equals zero, if this district control deviation equals zero, then do not do action.

2. control system as claimed in claim 1, it is characterized in that, this control system is in AGC software platform.

3. a control method for the active power in power plant, is characterized in that, it utilizes control system as claimed in claim 1 to realize, and this control method comprises the following steps:

S ₁, judging area control deviation is greater than zero or be less than zero, if be greater than zero, then performs step S ₂if be less than zero, then perform step S ₅;

S ₂, reduce the active power of Hydro-Thermal Systems unit;

S ₃, judge that this district control deviation is greater than zero or equal zero and judge whether the active power of Hydro-Thermal Systems unit reduces to minimum value, if this district control deviation is greater than zero and the active power of Hydro-Thermal Systems unit does not reduce to minimum value, then return step S ₂if this district control deviation is greater than zero and the active power of Hydro-Thermal Systems unit reduces to minimum value, then perform step S ₄if this district control deviation equals zero, then process ends;

S ₄, reduce the active power of Wind turbines, until this district control deviation equals zero, then process ends;

S ₅, increase the active power of Wind turbines;

S ₆, judge that this district control deviation is less than zero or equal zero and judge whether the active power of Wind turbines is increased to maximum, if this district control deviation is less than zero and the active power of Wind turbines is not increased to maximum, then return step S ₅if this district control deviation is less than zero and the active power of Wind turbines is increased to maximum, then perform step S ₇if this district control deviation equals zero, then process ends;

S ₇, increase the active power of Hydro-Thermal Systems unit, until this district control deviation equals zero, then process ends.

4. control method as claimed in claim 3, it is characterized in that, this control method is applied to AGC software platform.

5. a control system for the active power in power plant, is characterized in that, this control system comprises one first judge module, one second judge module, one the 3rd judge module, one the 4th judge module and an active power controller module;

This first judge module is used for judging area control deviation and is greater than zero or be less than zero, if be greater than zero, then enable this second judge module, if be less than zero, then call an active power controller module to increase the active power of Wind turbines, then enable one the 3rd judge module;

This second judge module is for judging whether this district control deviation is greater than a Second Threshold, if, then call the active power that this active power controller module reduces Hydro-Thermal Systems unit and Wind turbines simultaneously, until this district control deviation is not more than this Second Threshold, then the 4th judge module is enabled, if not, then call this active power controller module to reduce the active power of Hydro-Thermal Systems unit, then enable the 4th judge module;

4th judge module is for judging that this district control deviation is greater than zero or equal zero and judge whether the active power of Hydro-Thermal Systems unit reduces to minimum value, if this district control deviation is greater than zero and the active power of Hydro-Thermal Systems unit does not reduce to minimum value, then call this active power controller module to reduce the active power of Hydro-Thermal Systems unit, and then perform the judgement flow process of the 4th judge module, if this district control deviation is greater than zero and the active power of Hydro-Thermal Systems unit reduces to minimum value, then call this active power controller module to reduce the active power of Wind turbines, until this district control deviation equals zero, if this district control deviation equals zero, then do not do action,

3rd judge module is for judging that this district control deviation is less than zero or equal zero and judge whether the active power of Wind turbines is increased to maximum, if this district control deviation is less than zero and the active power of Wind turbines is not increased to maximum, then call this active power controller module to increase the active power of Wind turbines, and then perform the judgement flow process of the 3rd judge module, if this district control deviation is less than zero and the active power of Wind turbines is increased to maximum, then call this active power controller module to increase the active power of Hydro-Thermal Systems unit, until this district control deviation equals zero, if this district control deviation equals zero, then do not do action.

6. control system as claimed in claim 5, it is characterized in that, this control system is in AGC software platform.

7. a control method for the active power in power plant, is characterized in that, it utilizes control system as claimed in claim 5 to realize, and this control method comprises the following steps:

S ₁, judging area control deviation is greater than zero or be less than zero, if be greater than zero, then performs step S ₂if be less than zero, then perform step S ₇;

S ₂, judge whether this district control deviation is greater than this Second Threshold, if so, then perform step S ₃, if not, then perform step S ₄;

S ₃, reduce the active power of Hydro-Thermal Systems unit and Wind turbines simultaneously, and return step S ₂;

S ₄, reduce the active power of Hydro-Thermal Systems unit;

S ₅, judge that this district control deviation is greater than zero or equal zero and judge whether the active power of Hydro-Thermal Systems unit reduces to minimum value, if this district control deviation is greater than zero and the active power of Hydro-Thermal Systems unit does not reduce to minimum value, then return step S ₄if this district control deviation is greater than zero and the active power of Hydro-Thermal Systems unit reduces to minimum value, then perform step S ₆if this district control deviation equals zero, then process ends;

S ₆, reduce the active power of Wind turbines, until this district control deviation equals zero, then process ends;

S ₇, increase the active power of Wind turbines;

S ₈, judge that this district control deviation is less than zero or equal zero and judge whether the active power of Wind turbines is increased to maximum, if this district control deviation is less than zero and the active power of Wind turbines is not increased to maximum, then return step S ₇if this district control deviation is less than zero and the active power of Wind turbines is increased to maximum, then perform step S ₉if this district control deviation equals zero, then process ends;

S ₉, increase the active power of Hydro-Thermal Systems unit, until this district control deviation equals zero, then process ends.

8. control method as claimed in claim 7, it is characterized in that, this control method is applied to AGC software platform.

9. a control system for the active power in power plant, is characterized in that, this control system comprises one first judge module, one second judge module, one the 3rd judge module, one the 4th judge module and an active power controller module;

Whether the absolute value that this first judge module is used for judging area control deviation is greater than a first threshold, if so, then enables this second judge module, if not, does not then do action;

This second judge module is for judging that this district control deviation is greater than zero or be less than zero, if be greater than zero, then call this active power controller module to reduce the active power of Hydro-Thermal Systems unit, then the 3rd judge module is enabled, if be less than zero, then call this active power controller module to increase the active power of Wind turbines, then enable the 4th judge module;

Whether the 3rd judge module is greater than this first threshold for judging this district control deviation and judges whether the active power of Hydro-Thermal Systems unit reduces to minimum value, if this district control deviation is greater than this first threshold and the active power of Hydro-Thermal Systems unit does not reduce to minimum value, then call this active power controller module to reduce the active power of Hydro-Thermal Systems unit, and then perform the judgement flow process of the 3rd judge module, if this district control deviation is greater than this first threshold and the active power of Hydro-Thermal Systems unit reduces to minimum value, then call this active power controller module to reduce the active power of Wind turbines, until this district control deviation is not more than this first threshold, if this district control deviation is not more than this first threshold, then do not do action,

Whether the 4th judge module is greater than this first threshold for judging the absolute value of this district control deviation and judges whether the active power of Wind turbines is increased to maximum, if the absolute value of this district control deviation is greater than this first threshold and the active power of Wind turbines is not increased to maximum, then call this active power controller module to increase the active power of Wind turbines, and then perform the judgement flow process of the 4th judge module, if the absolute value of this district control deviation is greater than this first threshold and the active power of Wind turbines is increased to maximum, then call this active power controller module to increase the active power of Hydro-Thermal Systems unit, until the absolute value of this district control deviation is not more than this first threshold, if the absolute value of this district control deviation is not more than this first threshold, then do not do action.

10. control system as claimed in claim 9, it is characterized in that, this control system is in AGC software platform.

The control method of the active power in 11. 1 kinds of power plants, is characterized in that, it utilizes control system as claimed in claim 9 to realize, and this control method comprises the following steps:

S ₁, judging area control deviation absolute value whether be greater than this first threshold, if so, then perform step S ₂, if not, then process ends;

S ₂, judge that this district control deviation is greater than zero or be less than zero, if be greater than zero, then perform step S ₃if be less than zero, then perform step S ₆;

S ₃, reduce the active power of Hydro-Thermal Systems unit;

S ₄, judge whether this district control deviation is greater than this first threshold and judges whether the active power of Hydro-Thermal Systems unit reduces to minimum value, if this district control deviation is greater than this first threshold and the active power of Hydro-Thermal Systems unit does not reduce to minimum value, then return step S ₃if this district control deviation is greater than this first threshold and the active power of Hydro-Thermal Systems unit reduces to minimum value, then perform step S ₅if this district control deviation is not more than this first threshold, then process ends;

S ₅, reduce the active power of Wind turbines, until this district control deviation is not more than this first threshold, then process ends;

S ₆, increase the active power of Wind turbines;

S ₇, judge whether the absolute value of this district control deviation is greater than this first threshold and judges whether the active power of Wind turbines is increased to maximum, if the absolute value of this district control deviation is greater than this first threshold and the active power of Wind turbines is not increased to maximum, then return step S ₆if the absolute value of this district control deviation is greater than this first threshold and the active power of Wind turbines is increased to maximum, then perform step S ₈if the absolute value of this district control deviation is not more than this first threshold, then process ends;

S ₈, increase the active power of Hydro-Thermal Systems unit, until the absolute value of this district control deviation is not more than this first threshold, then process ends.

12. control methods as claimed in claim 11, it is characterized in that, this control method is applied to AGC software platform.

The control system of the active power in 13. 1 kinds of power plants, it is characterized in that, this control system comprises one first judge module, one second judge module, one the 3rd judge module, one the 4th judge module, one the 5th judge module and an active power controller module;

Whether the absolute value that this first judge module is used for judging area control deviation is greater than a first threshold, if so, then enables this second judge module, if not, does not then do action;

This second judge module is for judging that this district control deviation is greater than zero or be less than zero, if be greater than zero, then enable the 3rd judge module, if be less than zero, then call this active power controller module to increase the active power of Wind turbines, then enable the 4th judge module;

3rd judge module is for judging whether this district control deviation is greater than a Second Threshold, if, then call the active power that this active power controller module reduces Hydro-Thermal Systems unit and Wind turbines simultaneously, until this district control deviation is not more than this Second Threshold, then the 5th judge module is enabled, if not, then call this active power controller module to reduce the active power of Hydro-Thermal Systems unit, then enable the 5th judge module;

Whether the 5th judge module is greater than this first threshold for judging this district control deviation and judges whether the active power of Hydro-Thermal Systems unit reduces to minimum value, if this district control deviation is greater than this first threshold and the active power of Hydro-Thermal Systems unit does not reduce to minimum value, then call this active power controller module to reduce the active power of Hydro-Thermal Systems unit, and then perform the judgement flow process of the 5th judge module, if this district control deviation is greater than this first threshold and the active power of Hydro-Thermal Systems unit reduces to minimum value, then call this active power controller module to reduce the active power of Wind turbines, until this district control deviation is not more than this first threshold, if this district control deviation is not more than this first threshold, then do not do action,

Whether the 4th judge module is greater than this first threshold for judging the absolute value of this district control deviation and judges whether the active power of Wind turbines is increased to maximum, if the absolute value of this district control deviation is greater than this first threshold and the active power of Wind turbines is not increased to maximum, then call this active power controller module to increase the active power of Wind turbines, and then perform the judgement flow process of the 4th judge module, if the absolute value of this district control deviation is greater than this first threshold and the active power of Wind turbines is increased to maximum, then call this active power controller module to increase the active power of Hydro-Thermal Systems unit, until the absolute value of this district control deviation is not more than this first threshold, if the absolute value of this district control deviation is not more than this first threshold, then do not do action.

14. control system as claimed in claim 13, it is characterized in that, this control system is in AGC software platform.

The control method of the active power in 15. 1 kinds of power plants, is characterized in that, it utilizes control system as claimed in claim 13 to realize, and this control method comprises the following steps:

S ₁, judge whether the absolute value of this district control deviation is greater than a first threshold, if so, then perform step S ₂, if not, then process ends;

S ₂, judge that this district control deviation is greater than zero or be less than zero, if be greater than zero, then perform step S ₃if be less than zero, then perform step S ₈;

S ₃, judge whether this district control deviation is greater than a Second Threshold, if so, then perform step S ₄, if not, then perform step S ₅;

S ₄, reduce the active power of Hydro-Thermal Systems unit and Wind turbines simultaneously, then return step S ₃;

S ₅, reduce the active power of Hydro-Thermal Systems unit;

S ₆, judge whether this district control deviation is greater than this first threshold and judges whether the active power of Hydro-Thermal Systems unit reduces to minimum value, if this district control deviation is greater than this first threshold and the active power of Hydro-Thermal Systems unit does not reduce to minimum value, then return step S ₅if this district control deviation is greater than this first threshold and the active power of Hydro-Thermal Systems unit reduces to minimum value, then perform step S ₇if this district control deviation is not more than this first threshold, then process ends;

S ₇, reduce the active power of Wind turbines, until this district control deviation is not more than this first threshold, then process ends;

S ₈, increase the active power of Wind turbines;

S ₉, judge whether the absolute value of this district control deviation is greater than this first threshold and judges whether the active power of Wind turbines is increased to maximum, if the absolute value of this district control deviation is greater than this first threshold and the active power of Wind turbines is not increased to maximum, then return step S ₈if the absolute value of this district control deviation is greater than this first threshold and the active power of Wind turbines is increased to maximum, then perform step S ₁₀if the absolute value of this district control deviation is not more than this first threshold, then process ends;

S ₁₀, increase the active power of Hydro-Thermal Systems unit, until the absolute value of this district control deviation is not more than this first threshold, then process ends.

16. control methods as claimed in claim 15, it is characterized in that, this control method is applied to AGC software platform.