CN107769274B - AGC control method and system for thermal power units based on wind power load change speed - Google Patents

Abstract

The invention discloses a thermal power unit AGC control method and system based on wind power load change speed. The system includes a real-time load measurement device, a deviation calculation module ADD, an absolute value calculation module, an input switching module T, and a proportional coefficient adjustment module F1(x) , an integral time adjustment module F2(x), a feedforward coefficient adjustment module F3(x), an AGC command input module, a feedforward command module MUL and an AGC PID controller. The present invention comprehensively considers the technical characteristics of wind power generation and thermal power generation AGC mode operation units, and dynamically changes the regulator control parameters of the AGC control system of thermal power generation units in the power grid according to the change speed of wind power generation load in the regional power grid, so that the adjustment of thermal power generation unit AGC The capacity is closely related to the change speed of the wind power load. On the basis of the stability of the control system, the rapid adjustment ability of the power grid is improved, and technical support is provided for the stable operation of the power grid.

Description

AGC control method and system for thermal power units based on wind power load change speed

technical field

The invention relates to the technical field of thermal power unit control, in particular to an AGC control method and system for thermal power unit based on wind power load change speed.

Background technique

At present, with the maturity of wind power technology and equipment, wind power has developed rapidly. The installed capacity of wind power and the proportion of power generation load in the power grid are increasing. In some regional power grids, the development speed of wind power has exceeded that of conventional thermal power. The development speed of power generation and the composition and structure of the power grid have undergone major changes. The rapid growth of new energy power generation scale has also brought about consumption problems. Completely different from traditional energy sources, new energy has the characteristics of large randomness, fast change speed, and poor adjustment ability. Large-scale new energy grid-connected consumption, for power System is a huge challenge.

In regional power grids where wind power is relatively concentrated and lacks hydropower, gas and other power generation methods with flexible adjustment capabilities, the rapid growth of wind power loads makes the rotating reserve load in the grid less and less, reducing the flexible adjustment capabilities of the grid, which is not conducive to the security of the grid Stable operation. In addition, during the operation of the power grid, a large number of thermal power generating units with good regulation performance operate in the AGC (Automatic Generation Control, automatic generation control) mode, and dynamically participate in the frequency regulation and peak regulation of the power grid.

However, the parameters of the AGC control system of this type of unit are basically set to operate with fixed parameters, regardless of the impact of wind power load on the grid, and have their own inherent adjustment speed, and their dynamic adjustment capabilities cannot be fully utilized.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention proposes an AGC control method and system for thermal power units based on the changing speed of wind power load, which can realize the coordinated control of wind power generation and thermal power generation in the regional power grid, and ensure the consumption of new energy power generation load , and at the same time reduce the adverse impact of the inherent technical characteristics of wind power generation on the power grid, and improve the rapid adjustment capability of the power grid.

The technical scheme that the present invention solves its technical problem to take is:

On the one hand, a kind of AGC control method of thermal power unit based on wind power load change speed provided by the embodiment of the present invention, it comprises the following steps:

Obtain the real-time load data of wind power generation, and judge the quality of the real-time load. If the real-time load value is judged correctly, then perform subsequent processing, otherwise, perform subsequent processing on the previous real-time effective load value;

Keep the current real-time load effective value for a fixed time T;

Compare the difference between the current real-time load effective value and the real-time load effective value before the fixed time T, and calculate the wind power generation load change value;

Calculate the absolute value of the wind power load change value;

When the input switch is triggered, enter the next step to dynamically adjust the AGC control parameters according to the wind power load change speed, otherwise the function of dynamically adjusting the AGC control parameters will be blocked;

Generate proportional coefficient, integral time and feed-forward coefficient according to the speed of wind power load change;

Generate AGC-controlled feed-forward commands according to changes in AGC commands and feed-forward coefficients;

According to the deviation between the AGC command and the real-time load of the unit, the AGC control parameters are dynamically adjusted, and the unit load control command is generated to adjust the unit load.

As a possible implementation of this embodiment, the AGC control method of the thermal power unit further includes the following steps:

Carry out protection limitation on dynamic adjustment of AGC control parameters.

As a possible implementation of this embodiment, when the function of dynamically adjusting the AGC control parameters is shielded, the load adjustment of the operating unit with fixed parameters is used.

As a possible implementation manner of this embodiment, the fixed time T is 60 seconds.

On the other hand, an AGC control system for thermal power units based on the speed of change of wind power load provided by an embodiment of the present invention includes:

The real-time load measurement device is used to obtain the real-time load data of wind power generation and judge the quality of the real-time load. If the real-time load value is judged correctly, it will be sent to the deviation calculation module ADD and the lag processing e- ^Ts module for subsequent processing, otherwise it will be uploaded A real-time load effective value is sent to the deviation calculation module ADD and the lag processing e- ^Ts module for subsequent processing;

The lag processing e ^-Ts module is used to keep the current real-time load effective value for a fixed time T;

The deviation calculation module ADD is used to compare the difference between the current real-time load effective value and the real-time load effective value before the fixed time T, and calculate the wind power generation load change value;

The absolute value calculation module is used to calculate the absolute value of the wind power generation load change value;

The input switching module T, when the input switch is 1, the input switching module T sends the calculation result of the absolute value calculation module to the proportional coefficient adjustment module, the integral time adjustment module and the feedforward coefficient adjustment module, so that the system input changes according to the wind power generation load The speed dynamically adjusts the AGC control parameter function; when the input switch is 0, the switching module T is not sent to the calculation result of the absolute value calculation module, and the function of dynamically adjusting the AGC control parameter is blocked;

The proportional coefficient adjustment module F1(x) is used to generate a proportional coefficient according to the speed of wind power load change;

The integral time adjustment module F2(x), is used to generate the integral time according to the change speed of the wind power load;

The feed-forward coefficient adjustment module F3(x) is used to generate the feed-forward coefficient according to the speed of wind power load change;

AGC command input module, used to input AGC command;

The real-time load measuring device is also used to send the obtained real-time load value of wind power generation to the AGC PID controller;

The feedforward command module MUL is used to generate the feedforward command for AGC control according to the change of the AGC command and the feedforward coefficient;

The AGC PID controller is used to dynamically adjust the AGC control parameters according to the deviation between the AGC command and the real-time load of the unit, and generate a unit load control command to adjust the unit load.

As a possible implementation of this embodiment, the AGC control system of the thermal power unit further includes:

The limiting speed limiting module is set between the proportional coefficient adjustment module F1(x), the integral time adjustment module F2(x) and the feedforward command module MUL and the AGC PID controller, and is used to control the dynamics of the controller sent to the AGC PID Adjust AGC control parameters for protection limitation.

As a possible implementation of this embodiment, when the function of dynamically adjusting AGC control parameters is shielded, the AGC PID controller generates a unit load control instruction according to a fixed parameter to adjust the unit load.

As a possible implementation of this embodiment, the fixed time T maintained by the e ^-Ts module for lag processing is 60 seconds.

The beneficial effects that the technical solutions of the embodiments of the present invention may have are as follows:

The technical scheme of the embodiment of the present invention comprehensively considers the technical characteristics of wind power generation and thermal power generation AGC mode operation units, and dynamically changes the proportional coefficient, integral time and front-end of the AGC control system of thermal power generation units in the power grid according to the change speed of wind power generation load in the regional power grid. Feedback coefficient and other regulator control parameters make the adjustment ability of thermal power unit AGC closely related to the change speed of wind power load. On the basis of the stability of the thermal power unit AGC control system, the faster the wind power load changes, the faster the thermal power unit AGC regulation The corresponding speed is faster, which ensures the flexible adjustment ability during the operation of the power grid, improves the power supply quality of the power grid, and at the same time enhances the ability of the power grid to absorb wind power generation, and promotes the coordinated development of the power system's source and network.

The technical solution of the embodiment of the present invention realizes the coordinated control of wind power generation and thermal power generation in the regional power grid, which ensures the consumption of new energy power generation load and reduces the inherent technical characteristics of wind power generation load randomness, change speed, and poor adjustment ability The adverse impact on the power grid improves the rapid adjustment capability of the power grid and provides technical support for the stable operation of the power grid.

Description of drawings

Fig. 1 is a flow chart of a thermal power unit AGC control method based on wind power load change speed shown according to an exemplary embodiment;

Fig. 2 is a flow chart of another AGC control method for thermal power units based on wind power load change speed shown according to an exemplary embodiment;

Fig. 3 is a schematic diagram of an AGC control system for a thermal power unit based on a wind power load change speed according to an exemplary embodiment.

Detailed ways

In order to clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific implementation modes and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. It should be noted that components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted herein to avoid unnecessarily limiting the present invention.

In the rapid development of wind power generation, how to effectively overcome the technical characteristics of poor controllability of wind power generation is a technical problem in the power system. From the perspective of joint control of wind power generation and thermal power generation, the present invention dynamically changes The load adjustment speed of the thermal power generation unit makes use of the technical characteristics of strong controllability of thermal power generation to make up for the deficiency of wind power generation.

Fig. 1 is a flow chart of an AGC control method for a thermal power unit based on a wind power load change speed according to an exemplary embodiment. As shown in Figure 1, a kind of AGC control method of thermal power unit based on wind power load change speed that the embodiment of the present invention provides, it comprises the following steps:

Step 1. Obtain the real-time load data of wind power generation, and perform quality judgment on the real-time load (parameter mutation, limit violation, etc.). If the real-time load value is judged correctly, follow-up processing is performed; otherwise, follow-up processing is performed on the previous real-time effective load value;

Step 2, keep the effective value of the current real-time load for a fixed time T;

Step 3, compare the difference between the current real-time load effective value and the real-time load effective value before the fixed time T, and calculate the wind power generation load change value;

Step 4, calculate the absolute value of the load change value of wind power generation, and provide data reference for the subsequent calculation of proportional coefficient, integral time and feedforward coefficient;

Step 5, when the input switch is triggered, enter the next step to dynamically adjust the AGC control parameters according to the wind power load change speed, otherwise the function of dynamically adjusting the AGC control parameters is blocked;

Step 6, generating a proportional coefficient, an integral time and a feed-forward coefficient according to the wind power load change speed;

Step 7, generating an AGC-controlled feed-forward command according to changes in the AGC load command and the feed-forward coefficient, which is used to increase the load regulation speed;

Step 9, according to the deviation between the AGC command and the real-time load of the unit, dynamically adjust the AGC control parameters, and generate a unit load control command to adjust the unit load.

In a possible implementation, as shown in Figure 2, another thermal power unit AGC control method of this embodiment further includes the following steps:

In step 8, the dynamic adjustment of the AGC control parameters is protected and limited to prevent sudden changes in the process of adjusting the parameters and ensure the stable operation of the system.

In a possible implementation manner, when the function of dynamically adjusting the AGC control parameters is shielded, the load adjustment of the operating unit with fixed parameters is used.

In a possible implementation manner, the fixed time T can be dynamically adjusted according to the actual operation of the power grid, and is generally set to 60 seconds.

Fig. 3 is a schematic diagram of an AGC control system for a thermal power unit based on a wind power load change speed according to an exemplary embodiment. As shown in Fig. 3, a kind of thermal power unit AGC control system based on wind power load change speed provided by the embodiment of the present invention, it comprises:

The real-time load measurement device is used to obtain real-time load data of wind power generation, and make quality judgments on the real-time load such as parameter mutation and limit violation. If the real-time load value is judged correctly, it will be sent to the deviation calculation module ADD and the lag processing e ^-Ts module for further processing. Subsequent processing, otherwise the last real-time load effective value is sent to the deviation calculation module ADD and the lag processing e- ^Ts module for subsequent processing; the lag processing e ^-Ts module is used to keep the current real-time load effective value for a fixed time T;

The deviation calculation module ADD is used to compare the difference between the current real-time load effective value and the real-time load effective value before the fixed time T, and calculate the wind power generation load change value, and send it to the absolute value calculation module;

The absolute value calculation module is used to calculate the absolute value of the load change value of wind power generation, and provide data reference for subsequent F1(x), F2(x) and F3(x) parameter calculations;

The input switching module T, when the input switch is 1, the input switching module T sends the calculation result of the absolute value calculation module to the proportional coefficient adjustment module, the integral time adjustment module and the feedforward coefficient adjustment module, so that the system input changes according to the wind power generation load The speed dynamically adjusts the AGC control parameter function; when the input switch is 0, the switching module T is not sent to the calculation result of the absolute value calculation module, and the function of dynamically adjusting the AGC control parameter is blocked;

The proportional coefficient adjustment module F1(x) is used to generate a proportional coefficient according to the speed of wind power load change;

The integral time adjustment module F2(x), is used to generate the integral time according to the change speed of the wind power load;

The feed-forward coefficient adjustment module F3(x) is used to generate the feed-forward coefficient according to the speed of wind power load change;

AGC command input module, used to input AGC command;

The real-time load measuring device is also used to send the obtained real-time load value of wind power generation to the AGC PID controller;

The feed-forward instruction module MUL is used to generate the AGC-controlled feed-forward instruction according to the change of the AGC instruction and the feed-forward coefficient, and is used to increase the load adjustment speed;

The AGC PID controller is used to dynamically adjust the AGC control parameters according to the deviation between the AGC command and the real-time load of the unit, and generate a unit load control command to adjust the unit load.

In a possible implementation, the thermal power unit AGC control system of this embodiment also includes a proportional coefficient adjustment module F1(x), an integral time adjustment module F2(x), a feedforward command module MUL and an AGC PID controller The limiting and speed limiting module between them is used to protect and limit the dynamic adjustment of AGC control parameters sent to the controller sent to the AGC PID, to prevent sudden changes in the process of adjusting parameters, and to ensure stable operation of the system.

In a possible implementation manner, when the function of dynamically adjusting AGC control parameters is shielded, the AGC PID controller generates a unit load control instruction according to a fixed parameter to adjust the unit load.

For example, when the AGC PID regulation controller of a thermal power generation unit operates with fixed parameters, the regulation parameters are: proportional coefficient Kp0, integral time Ti0, and feedforward coefficient FF0. At this time, the comprehensive technical indicators of the AGC control system are optimal. The critical adjustment parameters of the system (that is, the fastest adjustment speed in the stable state of the system) are: proportional coefficient Kpmax, integral time Timin, feedforward coefficient FFmax, and Kp0≤Kpmax, Timin≤Ti0, FF0≤FFmax. The maximum value of wind power load change speed is Pmax.

The proportional coefficient generated by the proportional coefficient adjustment module F1(x) according to the wind power load change speed is shown in Table 1:

Table 1: Dynamically Generated Scale Factors

Wind load change speed x Scale factor of F1(x) output 0 Kp0 30% Pmax Kp0 90% Pmax Kpmax Pmax Kpmax

The integral time generated by the integral time adjustment module F2(x) according to the wind power load change speed is shown in Table 2:

Table 2: Dynamically generated integration times

Wind load change speed x Scale factor of F2(x) output 0 Ti0 30% Pmax Ti0 90% Pmax Timin Pmax Timin

The feed-forward coefficient generated by the feed-forward coefficient adjustment module F3(x) according to the wind power load change speed is shown in Table 3:

Table 3: Dynamically generated feed-forward coefficients

Wind power load change speed x Scale factor of F3(x) output 0 FF0 30% Pmax FF0 90% Pmax FFmax Pmax FFmax

In a possible implementation, according to the actual operation of the power grid, the fixed time T maintained by the lag processing e ^-Ts module can be dynamically adjusted, generally set to 60 seconds

The embodiment of the present invention comprehensively considers the technical characteristics of wind power generation and thermal power generation AGC mode operation units, and dynamically changes the proportional coefficient, integral time and feedforward of the AGC control system of thermal power generation units in the power grid according to the change speed of wind power generation load in the regional power grid Coefficient and other regulator control parameters, so that the adjustment ability of thermal power unit AGC is closely related to the change speed of wind power load. On the basis of the stability of the thermal power unit AGC control system, the faster the wind power load change speed, the faster the thermal power unit AGC adjustment speed. The response is faster.

The embodiment of the present invention realizes the coordinated control of wind power generation and thermal power generation in the regional power grid, which ensures the consumption of new energy power generation load and also reduces the inherent technical characteristics of wind power generation load randomness, change speed, and poor adjustment ability. The adverse effects brought by the power grid have improved the rapid adjustment capability of the power grid and provided technical support for the stable operation of the power grid.

The embodiments of the present invention generally ensure the flexible adjustment capability during the operation of the power grid, improve the power supply quality of the power grid, and at the same time enhance the capacity of the power grid to accommodate wind power generation, and promote the coordinated development of the source network of the power system.

The above is only a preferred embodiment of the present invention. For those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered as the present invention. protection scope of the invention.

Claims (8)

1. a kind of fired power generating unit AGC control system based on wind-powered electricity generation load variations speed, characterized in that include:

Real-time load measuring device carries out quality judgement for obtaining the real-time load data of wind-power electricity generation, and to real-time load, It is sent to deviation if real-time load value correct judgment and calculates modules A DD and lag processing e^-TsModule carries out subsequent processing, no Upper real-time load virtual value is then sent to deviation and calculates modules A DD and lag processing e^-TsModule carries out subsequent processing；

Lag processing e^-TsModule, for current real-time load virtual value to be kept fixed time T；

Deviation calculates modules A DD, for carrying out the real-time load virtual value before current real-time load virtual value and set time T It takes difference relatively, and calculates wind-power electricity generation load variations value；

Absolute value computing module, for carrying out absolute value calculating to wind-power electricity generation load variations value；

Switching module T is put into, when investment switch is 1, investment switching module T sends the calculated result of absolute value computing module To proportionality coefficient adjustment module, time of integration adjustment module and feed-forward coefficients adjustment module, make system investment according to wind-power electricity generation Load variations speed dynamic adjustment AGC control parameter function；When investment switch is 0, investment switching module T is not sent then absolutely It is worth the calculated result of computing module, and shields dynamic adjustment AGC control parameter function；

Proportionality coefficient adjustment module F1 (x), for generating proportionality coefficient according to wind-power electricity generation load variations velocity magnitude；

Time of integration adjustment module F2 (x), for generating the time of integration according to wind-power electricity generation load variations velocity magnitude；

Feed-forward coefficients adjustment module F3 (x), for generating feed-forward coefficients according to wind-power electricity generation load variations velocity magnitude；

AGC instruction input module, for inputting AGC instruction；

Real-time load measuring device, the wind-power electricity generation real-time load value for being also used to will acquire are sent to AGC PID controller；

Feedover instruction module MUL, and the feedforward for generating AGC control according to the variation of AGC instruction and feed-forward coefficients instructs；

AGC PID controller carries out dynamic adjustment AGC control ginseng for the deviation according to AGC instruction and unit real-time load Number, and generate unit load control instruction and carry out unit load adjusting.

2. as described in claim 1 based on the fired power generating unit AGC control system of wind-powered electricity generation load variations speed, characterized in that also Include:

Clipping speed limit module, setting is in proportionality coefficient adjustment module F1 (x), time of integration adjustment module F2 (x) and feedforward instruction Between module MUL and AGC PID controller, for being carried out to the controller dynamic adjustment AGC control parameter for being sent to AGC PID Protection limitation.

3. as claimed in claim 1 or 2 based on the fired power generating unit AGC control system of wind-powered electricity generation load variations speed, characterized in that In shielding dynamic adjustment AGC control parameter function, the AGC PID controller refers to according to parameter generation unit load control is determined It enables and carries out unit load adjusting.

4. as claimed in claim 1 or 2 based on the fired power generating unit AGC control system of wind-powered electricity generation load variations speed, characterized in that The lag handles e^-TsThe set time T that module is kept is 60 seconds.

5. a kind of fired power generating unit AGC control method based on wind-powered electricity generation load variations speed, characterized in that utilize claim 1-4 A kind of fired power generating unit AGC control system based on wind-powered electricity generation load variations speed described in any one carries out fired power generating unit AGC Control, the described method comprises the following steps:

The real-time load data of wind-power electricity generation is obtained, and quality judgement is carried out to real-time load, if the judgement of real-time load value is just It is true then carry out subsequent processing, subsequent processing otherwise is carried out to upper real-time load virtual value；

Current real-time load virtual value is kept fixed time T；

Compared with current real-time load virtual value is carried out taking difference with the real-time load virtual value before set time T, and calculate outlet air Power generation load changing value；

Absolute value calculating is carried out to wind-power electricity generation load variations value；

When triggering investment switch, dynamic adjustment AGC control ginseng is carried out according to wind-power electricity generation load variations speed into next step Number, otherwise shielding dynamic adjusts AGC control parameter function；

Proportionality coefficient, the time of integration and feed-forward coefficients are generated according to wind-power electricity generation load variations velocity magnitude；

It is instructed according to the feedforward that AGC instruction and the variation of feed-forward coefficients generate AGC control；

According to the deviation of AGC instruction and unit real-time load, dynamic adjustment AGC control parameter is carried out, and generates unit load control System instruction carries out unit load adjusting.

6. as claimed in claim 5 based on the fired power generating unit AGC control method of wind-powered electricity generation load variations speed, characterized in that also The following steps are included:

Protection limitation is carried out to dynamic adjustment AGC control parameter.

7. such as the fired power generating unit AGC control method described in claim 5 or 6 based on wind-powered electricity generation load variations speed, characterized in that In shielding dynamic adjustment AGC control parameter function, using determining parameter operating unit Load Regulation.

8. such as the fired power generating unit AGC control method described in claim 5 or 6 based on wind-powered electricity generation load variations speed, characterized in that The set time T is 60 seconds.