CN117728437A - Reactive current detection and control system of static reactive generator - Google Patents
Reactive current detection and control system of static reactive generator Download PDFInfo
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Abstract
The invention relates to the technical field of reactive current detection and control, and discloses a reactive current detection and control system of a static reactive generator, wherein a current detection and control module comprises: the current sensor module is used for measuring current in the power system through the current sensor and acquiring a real-time current signal; the current sampling and processing module is used for sampling and digitizing the current signal acquired by the current sensor module; a controller module for generating a control signal according to the power current reference value calculated by the control algorithm; the current driving module is used for driving the static reactive generator to generate corresponding reactive current output; the feedback loop module is used for monitoring and feeding back reactive current in real time and comparing actual output current with reference current; and the actuator module is used for controlling the execution output of the reactive power according to the input of the control signal.
Description
Technical Field
The invention relates to the technical field of reactive current detection and control, in particular to a reactive current detection and control system of a static reactive generator.
Background
The static var generator STATCOM is a reactive power compensation device used in a power system, the stability and quality of the power system are improved by adjusting reactive power, reactive power in the power system is one of important factors for maintaining voltage stability and balancing supply and demand, as renewable energy sources such as wind power, solar energy and the like are connected into the power system in a large scale, fluctuation and uncertainty of the reactive power generator STATCOM bring new challenges to reactive power control of a power grid, reactive power fluctuation generated by a new energy power generation system can influence the power grid, corresponding reactive power compensation means are needed for stabilizing operation of the power system, and power electronics technology is advanced. Along with the rapid development of power electronics technology, the implementation of STATCOM is enabled by the application of high-performance power electronics and control algorithms, the reactive power can be rapidly responded and accurately controlled by advanced power electronic switching devices and control technologies, the reactive power compensation requirement of a power system is met, the fixed compensation capacity of a traditional reactive compensation device such as a reactive compensation capacitor or a reactive compensation reactor is limited, and the requirement of the running state and load change of a power grid cannot be met, so that a reactive current detection and control system of a static reactive generator is provided.
At present, the reactive current detection and control system of the static var generator is used for detecting and controlling the current condition of the static var generator in real time, but the inside of the system is easy to be subjected to external interference to change in the running process, for example, when short-time heavy current is impacted, the reactive current output by the static var generator is unstable, so that the power factor adjustment of the system is changed to cause temperature control, the temperature of the system cannot be kept near a set value, and the service life of equipment is influenced.
Disclosure of Invention
Aiming at the defect that the inside of the system is easily interfered by the outside to generate temperature change in the prior art, the invention provides a reactive current detection and control system of a static reactive generator, which has the advantage of being capable of maintaining the temperature of the system near a set value when the outside interference occurs.
In order to achieve the above purpose, the present invention provides the following technical solutions: a reactive current detection and control system for a static var generator, the current detection and control module comprising:
the current sensor module is used for measuring current in the power system through the current sensor and acquiring a real-time current signal;
the current sampling and processing module is used for sampling and digitizing the current signal acquired by the current sensor module;
a controller module for generating a control signal according to the power current reference value calculated by the control algorithm;
the current driving module is used for driving the static reactive generator to generate corresponding reactive current output;
the feedback loop module is used for monitoring and feeding back reactive current in real time and comparing actual output current with reference current;
an actuator module for controlling the execution output of reactive power according to the input of the control signal;
the controller module is provided with a control algorithm reference module, and the control algorithm reference module is based on a calculation formula of reactive powerThe reactive power of the current is calculated, the feedback loop module comprises a PID controller module, the PID controller module controls according to the deviation accumulation and change rate adjusting system of the current temperature and the set temperature of the equipment, and the PID controller module comprises a proportional control parameter introducing module, an integral control parameter introducing module and a differential control parameter introducing module.
The current sensor module detects current by using a current transformer, the current transformer realizes the measurement of current by an electromagnetic induction principle, the current transformer consists of an iron core and a coil, when the current to be measured passes through the iron core, a generated magnetic field induces a voltage signal in the coil, the magnitude of the current is determined by measuring the magnitude of the voltage signal, and current information is transmitted to the current sampling and processing module.
The current sampling and processing module performs sampling by using a fast analog-to-digital converter ADC technology, the ADC adopts bit or bit resolution to obtain a high-precision electric signal, and the analog signal is converted into a digital signal by the analog-to-digital converter ADC, and the process is as follows: ivar=q/(v×sqrt (3)) implements reactive current calculation.
The controller module designs the injection quantity and the phase angle of reactive current based on the reactive current calculation result of the current sampling and processing module, generates a control signal, adjusts the injection of the reactive current by driving the STATCOM power electronic device, controls the injection of the reactive current to adjust the reactive power of the power grid, and maintains the voltage stable.
The current drive module measures the magnitude and phase of the current in the STATCOM using a hall effect sensor and a resistive divider while amplifying to a sufficient current level using a power amplifier control signal to drive the power electronics, the power amplifier adjusting the on-time and off-time of the switching device to control the current output based on a pulse width modulation PWM technique.
The PID controller module is based onWherein u (T) represents the output of the controller, e (T) represents the error, kp, ki, kd represent the proportional, integral and derivative control parameters, respectively, a temperature control system is set, the temperature of the system is controlled to be kept near a set value by a PID controller module, the current temperature is set as T, the set temperature is Tset, the error e (T) =Tset-T, the output of the PID controller module can be expressed as +_according to a PID control formula>The controller outputs u (t) to regulate the temperature control of the system according to the error between the current temperature and the set temperature.
The proportional control parameter introducing module regulates the output of the controller according to the current error, so that the output of the controller is in direct proportion to the error, the larger the error is, the larger the output is, and the quick response error change is realized.
The actuator module adjusts the working state of the power electronic device by using Pulse Width Modulation (PWM) based on the control quantity calculated by the PID controller module, determines the values of three parameters of the proportional control parameter introduction module, the integral control parameter introduction module and the differential control parameter introduction module based on a Ziegler-Nichols setting method, generates control signals, converts the control signals into high-frequency pulse signals by using a PWM technology, controls the switching state of the power electronic device, and simultaneously uses a communication interface to carry out data interaction and instruction transmission with other controllers so as to realize linkage and cooperative work of a STATCOM control system.
The beneficial effects are that:
1. the reactive current detection and control system of the static reactive generator can monitor the state and temperature change of the system in real time through the PID control algorithm, and calculate the adjustment control quantity according to the change condition, thereby avoiding the conditions of system temperature fluctuation and instability, and being capable of maintaining the system temperature near a set value when external interference occurs, and guaranteeing the normal operation of the system.
2. According to the reactive current detection and control system of the static reactive generator, the PID control algorithm can calculate the control quantity required by temperature adjustment according to the real-time feedback signal and the error value, and the control quantity is adjusted according to the proportional control parameter, the integral control parameter and the differential coefficient control parameter of three parameters in the ID control algorithm, so that stable control of the system is realized, and the temperature of the system is effectively maintained to be stable near a set value.
Drawings
Fig. 1 is a system block diagram of a static var generator reactive current detection and control system.
In the figure: 1. a current sensor module; 2. the current sampling and processing module is used for sampling and processing the current; 3. a controller module; 4. a current driving module; 5. a feedback loop module; 6. an actuator module; 7. a control algorithm quoting module; 8. a PID controller module; 9. a proportion control parameter introduction module; 10. an integral control parameter introduction module; 11. the differential control parameters are introduced into the module.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, a reactive current detection and control system of a static var generator, a current detection and control module includes:
a current sensor module 1 for measuring a current in the power system by a current sensor to obtain a real-time current signal;
the current sampling and processing module 2 is used for sampling and digitizing the current signals acquired by the current sensor module 1;
a controller module 3 for generating a control signal from the power current reference value calculated by the control algorithm;
a current drive module 4 for driving the static var generator to generate a corresponding reactive current output;
the feedback loop module 5 is used for monitoring and feeding back reactive current in real time and comparing actual output current with reference current;
an actuator module 6 for controlling the execution output of reactive power according to the input of the control signal;
the controller module 3 is provided with a control algorithm reference module 7, and the control algorithm reference module 7 is based on a calculation formula of reactive powerThe feedback loop module 5 for calculating the reactive power of the current comprises a PID controller module 8, the PID controller module 8 controls according to a deviation accumulation and change rate adjusting system of the current temperature and the set temperature of the equipment, and the PID controller module 8 comprises a proportional control parameter introducing module 9, an integral control parameter introducing module 10 and a differential control parameter introducing module 11.
The current sensor module 1 detects current by using a current transformer, the current transformer realizes the measurement of current by an electromagnetic induction principle, the current transformer consists of an iron core and a coil, when the current to be measured passes through the iron core, a generated magnetic field induces a voltage signal in the coil, the magnitude of the current is determined by measuring the magnitude of the voltage signal, and current information is transmitted to the current sampling and processing module 2.
The current sampling and processing module 2 uses a fast analog-to-digital converter ADC technology to sample, the ADC adopts 12-bit or 16-bit resolution to obtain a high-precision electric signal, and the analog signal is converted into a digital signal through the analog-to-digital converter ADC, and the process is as follows: ivar=q/(v×sqrt (3)) implements reactive current calculation.
The controller module 3 designs the injection amount and the phase angle of the reactive current based on the reactive current calculation result of the current sampling and processing module 2, generates a control signal, adjusts the injection of the reactive current by driving the STATCOM power electronic device, controls the injection of the reactive current to adjust the reactive power of the power grid, and maintains the voltage stable.
Wherein: the current sensor module 1 detects and measures the output current of the STATCOM by using a special current transformer, the current sampling and processing module 2 samples by using a fast analog-to-digital converter (ADC) technology, converts a current signal into a corresponding voltage signal and outputs the corresponding voltage signal to the controller module 3, the controller module 3 receives the current measurement signal provided by the current sampling and processing module 2, performs signal sampling and processing, realizes reactive current calculation based on Ivar=Q/(V×sqrt (3)), designs the injection amount and the phase angle of the reactive current, and generates a control signal.
Example two
Referring to fig. 1, further on the basis of the embodiment, the current driving module 4 measures the magnitude and phase of the current in the STATCOM using a hall effect sensor and a resistor divider, and simultaneously amplifies the current to a sufficient current level using a power amplifier control signal to drive the power electronics, and the power amplifier adjusts the on-time and off-time of the switching device to control the current output based on a pulse width modulation PWM technique.
The PID controller module 8 is based onWherein u (T) represents the output of the controller, e (T) represents the error, kp, ki, kd represent the proportional, integral and derivative control parameters, respectively, a temperature control system is set, the temperature of the system is controlled to be kept near a set value by a PID controller module 8, the current temperature is set as T, the set temperature is Tset, the error e (T) =tset-T, the PID controller module 8 can represent the output of the controller as +_according to the PID control formula>The controller outputs u (t) to regulate the temperature control of the system according to the error between the current temperature and the set temperature.
The proportional control parameter introducing module 9 adjusts the output of the controller according to the current error, so that the output of the controller is in direct proportion to the error, the larger the error is, the larger the output is, the quick response error change is realized, the integral control parameter introducing module 10 adjusts the output of the controller according to the accumulated value of the error, when the error exists continuously, the output of the controller is gradually increased to eliminate steady-state error, the differential control parameter introducing module 11 adjusts the output of the controller according to the error change rate, the oscillation and overshoot phenomena of the system are restrained, and the response time of the system is reduced.
The executor module 6 uses pulse width modulation PWM to adjust the working state of the power electronic device based on the control quantity calculated by the PID controller module 8, determines the values of three parameters of the proportional control parameter introducing module 9, the integral control parameter introducing module 10 and the differential control parameter introducing module 11 based on a Ziegler-Nichols setting method, generates control signals, uses PWM technology to convert the control signals into high-frequency pulse signals, controls the switching state of the power electronic device, and simultaneously uses a communication interface to carry out data interaction and instruction transmission with other controllers to realize the linkage and cooperative work of a STATCOM control system.
Wherein: the PID controller module 8 is based onThe proportional control parameter introducing module 9 calculates the control quantity of a proportional term according to the difference between the target reactive current and the actual measured current, the integral control parameter introducing module 10 calculates the control quantity of the integral term through integration of an accumulated error signal, the integral control can eliminate steady-state error, the stability of the system is enhanced, the system can reach a set value more quickly, the differential control parameter introducing module 11 suppresses oscillation and quick change of the system according to feedback information of the error change rate, the response speed and stability of the system are improved, the executor module 6 converts the control quantity calculated by the PID controller into a control signal suitable for driving the STATCOM, and the control signal is converted into a high-frequency pulse signal by using a PWM technology so as to control the switching state of the power electronic switching device in the STATCOM.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A reactive current detection and control system of a static var generator is characterized in that: the current detection and control module includes:
a current sensor module (1) for measuring current in the power system by means of a current sensor, obtaining a real-time current signal;
the current sampling and processing module (2) is used for sampling and digitizing the current signals acquired by the current sensor module (1);
a controller module (3) for generating a control signal from the power current reference value calculated by the control algorithm;
a current drive module (4) for driving the stationary reactive generator to produce a corresponding reactive current output;
a feedback loop module (5) for real-time monitoring and feedback of reactive current and comparing the actual output current with a reference current;
an actuator module (6) for controlling the execution output of reactive power according to the input of the control signal;
a control algorithm reference module (7) is arranged in the controller module (3), and the control algorithm reference module (7) is based on a calculation formula of reactive powerThe reactive power of the current is calculated, the feedback loop module (5) comprises a PID controller module (8), the PID controller module (8) is controlled according to a deviation accumulation and change rate adjusting system of the current temperature and the set temperature of the equipment, and the PID controller module (8) comprises a proportional control parameter introducing module (9), an integral control parameter introducing module (10) and a differential control parameter introducing module (11).
2. A static var generator reactive current detection and control system according to claim 1, characterized by: the current sensor module (1) detects current by using a current transformer, the current transformer realizes the measurement of current by an electromagnetic induction principle, the current transformer consists of an iron core and a coil, when the measured current passes through the iron core, a generated magnetic field induces a voltage signal in the coil, the magnitude of the current is determined by measuring the magnitude of the voltage signal, and current information is transmitted to the current sampling and processing module (2).
3. A static var generator reactive current detection and control system according to claim 1, characterized by: the current sampling and processing module (2) uses a fast analog-to-digital converter (ADC) technology to sample, the ADC adopts 12-bit or 16-bit resolution to acquire high-precision electric signals, and the analog signals are converted into digital signals through the ADC, and the process is as follows: ivar=q/(v×sqrt (3)) implements reactive current calculation.
4. A static var generator reactive current detection and control system according to claim 1, characterized by: the controller module (3) designs the injection amount and the phase angle of reactive current based on the reactive current calculation result of the current sampling and processing module (2), generates a control signal, adjusts the injection of the reactive current by driving the STATCOM power electronic device, controls the injection of the reactive current to adjust the reactive power of the power grid, and maintains the voltage stable.
5. A static var generator reactive current detection and control system according to claim 1, characterized by: the current drive module (4) uses a hall effect sensor and a resistor divider to measure the magnitude and phase of the current in the STATCOM while using a power amplifier control signal to amplify to a sufficient current level to drive the power electronics, the power amplifier controlling the current output by adjusting the on-time and off-time of the switching device based on a pulse width modulation PWM technique.
6. A static var generator reactive current detection and control system according to claim 1, characterized by: the PID controller module (8) is based onWherein u (T) represents the output of the controller, e (T) represents the error, kp, ki, kd represent the proportional, integral and derivative control parameters, respectively, a temperature control system is set, the temperature of the system is controlled to be kept near a set value by a PID controller module (8), the current temperature is set to be T, the set temperature is Tset, the error e (T) =Tset-T, the PID controller module (8) can represent the output of the controller as +_according to a PID control formula>The controller outputs u (t) to regulate the temperature control of the system according to the error between the current temperature and the set temperature.
7. A static var generator reactive current detection and control system according to claim 6, characterized by: the proportional control parameter introducing module (9) regulates the output of the controller according to the current error, so that the output of the controller is in direct proportion to the error, the larger the error is, the larger the output is, and the quick response error change is realized, the integral control parameter introducing module (10) regulates the output of the controller according to the accumulated value of the error, when the error exists continuously, the output of the controller is gradually increased, so that the steady-state error is eliminated, and the differential control parameter introducing module (11) regulates the output of the controller according to the error change rate, so that the oscillation and overshoot phenomena of the system are inhibited, and the response time of the system is reduced.
8. A static var generator reactive current detection and control system according to claim 1, characterized by: the actuator module (6) adjusts the working state of the power electronic device by using Pulse Width Modulation (PWM) based on the control quantity calculated by the PID controller module (8), determines the values of three parameters of the proportional control parameter introduction module (9), the integral control parameter introduction module (10) and the differential control parameter introduction module (11) based on a Ziegler-Nichols setting method, generates control signals, converts the control signals into high-frequency pulse signals by using PWM technology, controls the switching state of the power electronic device, and simultaneously uses a communication interface to carry out data interaction and instruction transmission with other controllers so as to realize linkage and cooperative work of the STATCOM control system.
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| CN102466412A (en) * | 2010-11-17 | 2012-05-23 | 中国科学院空间科学与应用研究中心 | Integrated control system and method of multi-temperature-area furnace |
| KR20130011163A (en) * | 2011-07-20 | 2013-01-30 | 한양대학교 산학협력단 | Appatatus and method for controlling static synchronous compensator |
| CN103414200A (en) * | 2013-08-16 | 2013-11-27 | 四川九成信息技术有限公司 | Method for monitoring and controlling automatic reactive power compensation system of high-low voltage power distribution network |
| CN103560528A (en) * | 2013-11-18 | 2014-02-05 | 国家电网公司 | STATCOM control system and method based on improved instantaneous reactive power |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466412A (en) * | 2010-11-17 | 2012-05-23 | 中国科学院空间科学与应用研究中心 | Integrated control system and method of multi-temperature-area furnace |
| KR20130011163A (en) * | 2011-07-20 | 2013-01-30 | 한양대학교 산학협력단 | Appatatus and method for controlling static synchronous compensator |
| CN103414200A (en) * | 2013-08-16 | 2013-11-27 | 四川九成信息技术有限公司 | Method for monitoring and controlling automatic reactive power compensation system of high-low voltage power distribution network |
| CN103560528A (en) * | 2013-11-18 | 2014-02-05 | 国家电网公司 | STATCOM control system and method based on improved instantaneous reactive power |
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