CN100369344C - Synthetized compensation device in electric power system and synthetized compensation method - Google Patents
Synthetized compensation device in electric power system and synthetized compensation method Download PDFInfo
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Abstract
The present invention relates to a synthetized compensation device and a synthetized compensation method of an electric power system. The synthetized compensation device mainly comprises a net side voltage detecting device, a net side current detecting device, a fundamental wave current extracting device of a load side, a digital signal processor (DSP), a control system, a pulse-width modulation generator, an inverter and an LC filter circuit, wherein the control system, the pulse-width modulation generator, the inverter and the LC filter circuit are based on the DSP. The present invention mainly adopts a structure and a control method which combine an unsmooth nonlinear control strategy and an extended state observer. The harmonic opposite phase compensation is changed into an ideal sine signal trace by using the observation output, the differential coefficient and the unknown inner and outer interference of the extended state observer. Meanwhile, a pressure controlled reactor type main circuit is adopted to realize the wattless dynamic compensation. The capacity of the inverter can be reduced into the minimum, and the trace of the given-phase ideal sine signal by the net side current is realized by controlling the voltage of the reactor. The filtering wave function is achieved, and the synthetized compensation device can be sufficiently ensured to reliably combine active filtering waves, passive filtering waves and wattless dynamic compensation into a whole.
Description
Technical Field
The invention belongs to the technical field of power engineering, and particularly relates to a comprehensive compensation device and a comprehensive compensation method for a power system composed of an active power system and a passive power system.
Background
With the rapid development of power technology, various power electronic devices are widely applied in the industrial fields of power systems, metallurgy, steel, chemical industry and the like, and the fields of traffic, building automation, family life and the like, so that the harmonic pollution condition in the power grid is increasingly serious. Furthermore, capacitors used in the power grid to increase power factor tend to resonate with system impedance, thereby causing harmonic amplification. This both aggravates harmonic pollution in the grid.
Harmonics in the grid do harm not only to the grid itself but also to its peripheral equipment. Harmonics in the power grid reduce on the one hand the efficiency of production, transmission and utilization of electrical energy, overheat electrical equipment, generate vibrations and noise, and age the insulation, reduce the service life, which even breaks down or burns out. Meanwhile, the harmonic wave can also cause the local parallel resonance or series resonance of the power system, so that the harmonic wave content is amplified, and the equipment such as a capacitor and the like is burnt. Harmonic waves can also cause relay protection and automatic device misoperation, so that electric energy metering is disordered. Outside the power system, harmonics can cause significant interference to communication equipment and electronic equipment.
Harmonic pollution in the power grid is becoming more serious, and thus, the demand for harmonic abatement devices is also increasing. Moreover, harmonic suppression is also an important component for building a green power grid. The existing harmonic treatment devices mainly have two categories: passive filtering means and active filtering means.
The passive filter device can be referred to a book of harmonic analysis and filtering of a high-voltage direct-current power transmission system published by water conservancy and power publishing agency in month 8 of 1994, a circuit structure diagram of the passive filter device is shown in fig. 1, and an equivalent circuit diagram under the action of harmonic waves is shown in fig. 2. The passive filter has the advantages of firmness, durability, low price and the like, but cannot solve the problem of amplifying certain harmonic wave caused by resonance. In addition to this disadvantage, passive filters have the following disadvantages:
1. the compensation performance is poor, and errors exist in the parameters of the capacitor and the inductor; the filter changes due to the change of ambient temperature, self heating and the influence of capacitor insulation aging in the operation process, so that the filtering effect of the filter is deteriorated;
2. poor dynamic performance when the load current dynamically changes, the suppression effect on the harmonic current is poor;
3. the compensation performance is influenced by the system impedance, and the filtering effect of the system impedance is influenced by the change of the system impedance;
4. even under ideal conditions, the device can only generate better suppression effect on harmonic current of specific times;
5. the volume is large and the occupied space is large.
For the active filter device, reference is made to the description of "Dongyang electric machinery Co., ltd." 1995. The schematic block diagram is shown in fig. 3. The basic principle is as follows: the active filter injects current with the same size as the load harmonic but opposite phase to the load harmonic to the power grid through control, so that the power grid current is sine wave, and the aim of eliminating the harmonic current is fulfilled.
The shortcomings of the current active filtering technology can be seen in the research on novel integrated power filtering system in doctor paper of Qinghua university in 1997, which mainly includes:
1. since the fundamental voltage of the ac power is directly applied to the inverter and the compensating current is completely supplied from the inverter, the capacity of the inverter must be large;
2. because the cost of the existing power electronic device is high, the price of the system is very expensive;
3. the detection circuit is susceptible to the influence of device parameter dispersion and debugging errors, which can affect the compensation performance of the detection circuit and needs further improvement;
4. the active filter device adopts a brand new structure, so the active filter device is not suitable for transforming the original passive filter device.
In view of the problems of the independent passive filter device and the active filter device, chinese patent ZL00109624.9 (publication No. CN1274977 a) discloses an "integrated power filter device composed of an active power filter and a passive power filter", which has a circuit principle as shown in fig. 4 and mainly comprises an active filter, a passive filter, a transformer and a control circuit, wherein one end of the passive filter is connected with a power grid, the other end of the passive filter is connected with one end of a secondary side of the transformer, the other ends of the secondary sides of the transformer are short-circuited together, one end of a primary side of the transformer is connected with a midpoint of an inverter bridge arm in the active filter, and the other ends of the primary side are short-circuited together. The control circuit comprises a current transformer, a harmonic detection circuit, a regulator, a pulse width modulation control circuit and a drive circuit. The current transformer converts a current signal of a power grid into a voltage signal, inputs the voltage signal into a harmonic detection circuit to obtain a harmonic current signal of the power grid, sends the harmonic current signal into a regulator, regulates the harmonic current signal together with a feedback signal of capacitance voltage in an active filter to obtain an instruction signal for controlling current, sends the instruction signal into a pulse width modulation control circuit, generates a corresponding control signal according to the symbol of the instruction signal, namely generates a signal when the instruction signal of one phase is greater than zero, sends the signal into a driving circuit, and conducts a switching tube of an upper bridge arm and a switching tube of a lower bridge arm of an inverter bridge of the active filter corresponding to the phase after shaping, amplification and isolation; if the output voltage is less than zero, a signal is generated and sent to the driving circuit, after shaping, amplification and isolation, the switching tube of the upper bridge wall of the inverter bridge of the corresponding active filter is turned off, and the switching tube of the lower bridge arm is turned on, so that the output voltage of the active filter is controlled, and filtering is realized. The integrated power filter device has the advantages of low cost, certain economical practicability and good filtering performance, and can not generate series resonance or parallel resonance, but has the following defects: firstly, because the harmonic wave with high frequency content must be detected, the detection difficulty is high and the accuracy is low, and in addition, because the filtering effect of a power grid is emphasized in the design, the power factor of the system is not considered, the reactive compensation effect is poor, and the comprehensive control of filtering and reactive power cannot be completely solved.
The institute of systematic science and sciences Han Jing, the researchers of the institute of systematic science and sciences of china academy of sciences, in 1995, proposed an extended state observer ESO for observing output signals, their derivatives and disturbance variables, see the literature, "extended state observer for uncertain objects", control and decision, vol.10 (1), 1995; in the same year, the researchers at Han Jing also proposed the nonlinear state error feedback control law NLSEF to solve the system tracking and disturbance compensation problems, see the literature "nonlinear state error feedback control law-NLSEF", control and decision, vol.10 (3), 1995. ESO and NLSEF are described in detail in the detailed description.
The ESO and NLSEF proposed by Han Jingqing provide the necessary technical tools for realizing simple nonlinear control of the system.
Disclosure of Invention
The invention aims to solve the problems, and provides a comprehensive compensation device and a comprehensive compensation method for an electric power system, which adopt a strategy of combining nonlinear non-smooth feedback control and an extended state observer, integrate active filtering and passive filtering, simultaneously realize comprehensive compensation of a power factor and filtering by using the same main circuit, and have the advantages of good comprehensive compensation effect, simple structure, easy realization and low cost.
The technical scheme of the invention is realized as follows:
an integrated compensation device of an electric power system is characterized by comprising:
the network side voltage detection device is used for detecting and extracting a sinusoidal voltage phase of the network side;
a grid-side current detection device for detecting and extracting a current waveform of the grid side;
the load side fundamental wave current extraction device is used for detecting and extracting the amplitude of the load side fundamental wave current;
the DSP is a large-capacity programmable microcomputer, is internally provided with an analog-to-digital converter, can convert a sampling analog signal into a digital signal through the analog-to-digital converter, and obtains a digital signal of a control law through a control algorithm, and mainly comprises a nonlinear state error feedback controller NLSEF and an extended state observer ESO, wherein the ESO is mainly used for estimating an output signal and the differential and interference of the output signal; NLSEF carries out nonlinear combination control on the error signal and the differential of the error signal so as to realize signal tracking and interference suppression;
a pulse width modulation generator for generating a pulse driving signal for driving the inverter according to the signal wave to be modulated;
the inverter is used for controlling the voltage on the L of the LC filter circuit according to the pulse driving signal;
the LC filter circuit is used for filtering the harmonic waves at the load side and achieving the purpose of adjusting the power factor of the power system through the adjustment of the voltage of the LC filter circuit;
the input ends of the network side voltage detection device are connected in parallel to the power grid, the output of the network side voltage detection device is converted into appropriate signals through the sampling circuit and sent into the DSP, and corresponding digital signals are obtained through an analog-to-digital converter in the DSP. The network side current detection device and the load side base wave current extraction device are respectively connected in series on each transmission line of the network side and the load side, digital signals of the transmission lines are obtained through the sampling circuit and the analog-to-digital converter, and the DSP controls the digital signals to realize signal tracking and interference suppression. The specific control mode is as follows: and obtaining the phase of the network side reference current through the detection of the network side voltage phase signal, and obtaining the amplitude of the network side reference current through the detection of the load side current fundamental component, thereby obtaining the network side reference current signal and a differential signal thereof. With reference current signal at network sideGenerating three state variables, i.e. the network-side current signal z, for the output of the input extended state observer ESO 1 And its differential signal z 2 And an interference amount z 3 Comparing the network side reference current and its differential signal with the network side current signal and its differential signal to obtain an error epsilon 1 And ε 2 Constructed appropriately with respect to epsilon 1 And ε 2 To obtain a nonlinear state error feedback control NLSEF signal u 0 /b 0 (b 0 Is a gain),which is a component of the control signal for signal tracking; z output by ESO 3 Another component-z of the control signal can be generated 3 /b 0 And the method is used for inhibiting the internal and external interference of the system. Dividing the two control components u 0 /b 0 And-z 3 /b 0 The control signals u (t) are obtained by adding and combining, wherein-u (t) is the differential of the voltage on the AC side of the inverter, and-u (t) is integrated to obtain the voltage on the AC side of the inverter. And (3) utilizing a Pulse Width Modulation (PWM) technology to enable the DSP to output a proper signal to control a driving circuit so as to ensure that the output voltage on the alternating current side of the inverter is a negative value of ^ u (tau) d tau. Using the inverter output voltage signal, jing Pingbo reactor L 1 And the voltage of an inductor L on the LC filter circuit is controlled.
An integrated compensation method of a power system, comprising the steps of:
firstly, a power supply voltage phase signal and a load current fundamental frequency amplitude signal which are obtained by a sampling circuit through a network side voltage detection device and a load side fundamental wave current extraction device are subjected to digital signal acquisition through an analog-to-digital converter of a DSP, and in a control algorithm, the load current fundamental frequency amplitude signal is used as a reference current i s * I using the power supply voltage phase signal extracted by the network side voltage detection device as the reference current s * Phase of (can also let i) s * The phase of the phase-lagging voltage by a small angle, i.e. under-compensation), to obtain the reference current i s * And its differential i s * ；
Secondly, obtaining the current i of the network side current detection device through a sampling circuit s The signal is converted into a digital signal through an analog-to-digital converter of the DSP, in a control algorithm, a network side current signal is used as an input signal of an ESO, and the output of the ESO generates three state variables, namely a network side current signal z 1 、z 1 Is a differential signal z 2 And an interference amount z 3 ；
Thirdly, comparing the network side reference current and the differential signal thereof with the network side current signal and the differential signal thereof to obtain an error epsilon 1 And ε 2 ，
Fourth, construct proper relation to epsilon 1 And ε 2 To obtain the NLSEF control signal u 0 /b 0 (b 0 Is a gain), the control signal u 0 /b 0 Is a component of the control signal for implementing signal tracking;
step five, using the z output of ESO 3 Another component-z of the control signal can be generated 3 /b 0 For suppressing the internal and external interference of the system;
sixthly, the two control components u are used 0 /b 0 And-z 3 /b 0 Adding and combining to obtain a control signal u (t), wherein-u (t) is the differential of the voltage on the AC side of the inverter, and integrating-u (t) to obtain the voltage on the AC side of the inverter;
seventhly, using Pulse Width Modulation (PWM) to make DSP output proper signal to control driving circuit so as to ensure that output voltage on AC side of inverter is negative value of ^ u (tau) d tau, using inverter to output voltage signal and making it pass through smoothing reactor L 1 And controlling the voltage on the inductance L of the LC filtering branch circuit to realize the tracking of the reference current.
The invention adopts the structure and the control method of combining the unsmooth nonlinear control strategy and the extended state observer, utilizes the extended state observer to observe output and differential thereof as well as unknown internal and external interference, and changes the anti-phase compensation of harmonic waves into the tracking of ideal sinusoidal signals, thereby avoiding detecting the harmonic component of load current with more high frequency content and reducing the detection difficulty of the harmonic waves. Because the voltage-controlled reactor type main circuit is adopted to realize reactive dynamic compensation, the capacity of the inverter can be reduced to the minimum, and the cost is saved; and the tracking of the network side given phase to an ideal sinusoidal signal is realized by controlling the voltage of the reactor, so that the filtering effect is achieved, the active filtering and the passive filtering can be reliably integrated, and the problems of amplification of certain harmonic caused by resonance in the passive filtering and high price in the active filtering are effectively solved. Therefore, the main circuit is used for reactive dynamic compensation and has a filtering function, and the purpose of the invention is achieved.
The structural implementation and the working principle and process of the invention are described in detail in the following with the accompanying drawings:
drawings
Fig. 1 is a schematic structural diagram of a conventional passive filter device;
fig. 2 is an equivalent circuit diagram of a conventional passive filter device;
fig. 3 is a schematic block diagram of a conventional active filter device;
FIG. 4 is an electrical schematic of a conventional integrated passive and active power filter arrangement;
FIG. 5 is a schematic structural composition of the present invention;
fig. 6 is a schematic diagram of the control structure of the present invention.
Detailed Description
As shown in fig. 5 and 6, the power system comprehensive compensation device according to the present invention includes:
a network side voltage detection device for detecting and extracting a sinusoidal voltage phase of the network side;
a grid-side current detection device for detecting and extracting a current waveform of the grid side;
the load side fundamental wave current extraction device is used for detecting and extracting the amplitude of the load side fundamental wave current;
the DSP is a large-capacity programmable microcomputer, is internally provided with an analog-to-digital converter, can convert a sampling analog signal into a digital signal through the analog-to-digital converter, and obtains a digital signal of a control law through a control algorithm. The ESO is mainly used for estimating the output signal, the differential of the output signal and interference; NLSEF carries out nonlinear combination control on the error signal and the differential of the error signal so as to realize signal tracking and interference suppression; the design idea of the control of ESO and NLSEF is as follows:
for ESO:
consider the following second order system:
or
x 1 、x 2 Is the state variable, y is the output, w is the disturbance, u is the control, for the control system, when w (t) and f (t, x) 1 ，x 2 And w) the state observer can be represented as known.
The following non-linear observer can be designed to estimate the state variable (x) of the above equation 1 ，x 2 ) And f (t, x) 1 ，x 2 ，w)：
Wherein beta is 01 ，β 02 ，β 03 Is observer gain, b 0 To gain, g 1 ，g 2 ，g 3 Is a suitably non-linear function such that z 1 ，z 2 ，z 3 Satisfies the following conditions:
where epsilon is a small positive constant.
For NLSEF:
ε 1 ＝v 1 -z 1 ，ε 2 ＝v 2 -z 2 for the error between the reference input and the system output and its differential, a suitable non-linear function h is selected 1 ，h 2 And parameter beta 1 ，β 2 Form a controller u 0 ＝β 1 h 1 (ε 1 )+β 2 h 2 (ε 2 )。
The nonlinear combinations are typically as follows:
u 0 ＝β 1 fal(e 2 ，a 1 ，δ 1 )+β 2 fal(e 3 ，α 2 ，δ 2 )
wherein e 2 ＝v 1 -z 1 ，e 3 ＝v 2 -z 2 ，u＝u 0 /b 0 -z 3 /b 0 。
The nonlinear function is:
as can be seen from fig. 6:
i s * is a reference current u s Assumed to be sinusoidal, v c Is the DC side voltage of the inverter, u is the control signal, v c u is the inverter AC side voltage, L 1 A flat wave electric impedance device connected in series with the output end of the inverter,
i s is a state variable, makes the load current
The above equation becomes the structure of the second order system:
wherein
Comparing the second order system, f (t, x) is known 1 ，x 2s W) consists of two parts, the first part being:
the second part is:
A pulse width modulation generator for generating a pulse driving signal for driving the inverter according to a signal wave to be modulated (i.e., a voltage signal on an ac side of the inverter);
the inverter is used for controlling the voltage on the L of the LC filter circuit according to the pulse driving signal;
the LC filter circuit is used for filtering the harmonic waves at the load side and achieving the purpose of adjusting the power factor of the power system through the adjustment of the voltage of the LC filter circuit;
the input ends of the network side voltage detection device are connected in parallel to the power grid, the output of the network side voltage detection device is converted into appropriate signals through the sampling circuit and sent into the DSP, and corresponding digital signals are obtained through an analog-to-digital converter in the DSP. The network side current detection device and the load side base wave current extraction device are respectively connected in series on each transmission line of the network side and the load side, and digital signals of the transmission lines are obtained through the signal sampling circuit and the analog-to-digital converter. The program on the DSP controls these signals. The specific control mode is as follows: and obtaining a network side reference current phase through the detection of the network side voltage phase signal, and obtaining the amplitude of the network side reference current through the detection of the load side current fundamental component, thereby obtaining a network side reference current signal and a differential signal thereof. The output of the extended state observer ESO with the network-side current signal as input generates a network-side current signal z, which is three state variables 1 And its differential signal z 2 And an amount of interference z 3 Comparing the network side reference current and its differential signal with the network side current signal and its differential signal to obtain the error epsilon 1 And ε 2 Constructed appropriately with respect to epsilon 1 And ε 2 To obtain a nonlinear state error feedback controlled NLSEF signal u 0 /b 0 (b 0 Gain), which is a component of the control signal used to achieve signal tracking; another component of the control signal, z, may be generated using z3 of the ESO output 3 /b 0 And the method is used for inhibiting internal and external interference of the system. The two control components u mentioned above 0 /b 0 And-z 3 /b 0 Combine to obtain a control signal uAnd (t), wherein-u (t) is the differential of the voltage on the AC side of the inverter, and-u (t) is integrated to obtain the voltage on the AC side of the inverter. The DSP outputs proper signal control by using Pulse Width Modulation (PWM)And a drive circuit for ensuring that the output voltage on the AC side of the inverter is a negative value of ^ u (tau) d tau. Using the inverter output voltage signal, jing Pingbo reactor L 1 And the voltage of an inductor L on the LC filter circuit is controlled.
The comprehensive compensation method of the power system comprises the following steps:
firstly, a power supply voltage phase signal and a load current fundamental frequency amplitude signal which are obtained by a sampling circuit are obtained by a network side voltage detection device and a load side fundamental wave current extraction device, and digital signals of the power supply voltage phase signal and the load current fundamental frequency amplitude signal are obtained by an analog-to-digital converter of the DSP. In the control algorithm, a load wave current fundamental frequency amplitude signal is used as a reference current i s * I using the power supply voltage phase signal extracted by the network side voltage detection device as the reference current s * Phase of (can also let i) s * The phase lag voltage of (a) is at a small angle, i.e. under-compensated), to obtain the reference current i s * And its differential i s * ′；
Secondly, obtaining the current i of the network side current detection device through a sampling circuit s And then converted into digital signals through an analog-to-digital converter of the DSP. In the control algorithm, the net side current signal is used as an input signal of the ESO, and the output of the ESO generates three state variables, namely a net side current signal z 1 、z 1 Is a differential signal z 2 And an interference amount z 3 。
Thirdly, comparing the network side reference current and the differential signal thereof with the network side current signal and the differential signal thereof to obtain an error epsilon 1 And ε 2 ，
Fourth, construct the proper relation to 1 And ε 2 To obtain the NLSEF control signal u 0 /b 0 (b 0 Is a gain), the control signal u 0 /b 0 Is a component of the control signal for implementing signal tracking;
fifth step, z output by ESO 3 Another component-z of the control signal can be generated 3 /b 0 And the method is used for inhibiting internal and external interference of the system.
And a sixth step of combining the two control components to obtain a control signal u (t), wherein-u (t) is the differential of the voltage on the AC side of the inverter, and-u (t) is integrated to obtain the voltage on the AC side of the inverter.
And seventhly, outputting an appropriate signal by the DSP to control a driving circuit by using a Pulse Width Modulation (PWM) technology so as to ensure that the output voltage on the AC side of the inverter is a negative value of ^ u (tau) d tau. Using the inverter to output a voltage signal through a smoothing reactor L 1 And the voltage on the inductance L of the LC filtering branch circuit is controlled, so that the tracking of the actual current to the reference current is realized.
Claims (2)
1. An integrated compensation device for an electric power system, comprising:
the network side voltage detection device is used for detecting and extracting a sinusoidal voltage phase of the network side;
a grid-side current detection device for detecting and extracting a current waveform of the grid side;
the load side fundamental wave current extraction device is used for detecting and extracting the amplitude of the load side fundamental wave current;
the DSP is a large-capacity programmable microcomputer, is internally provided with an analog-to-digital converter, can convert a sampling analog signal into a digital signal through the analog-to-digital converter, and obtains a digital signal of a control law through a control algorithm, and mainly comprises a nonlinear state error feedback controller NLSEF and an extended state observer ESO, wherein the ESO is mainly used for estimating an output signal and the differential and interference of the output signal; NLSEF carries out nonlinear combination control on the error signal and the differential of the error signal so as to realize signal tracking and interference suppression;
a pulse width modulation generator for generating a pulse driving signal for driving the inverter according to the signal wave to be modulated;
the inverter is used for controlling the voltage on the L of the LC filter circuit according to the pulse driving signal;
the LC filter circuit is used for filtering the harmonic waves at the load side and achieving the purpose of adjusting the power factor of the power system through the adjustment of the voltage of the LC filter circuit;
the network side current detection device and the load side base wave current extraction device are respectively connected in series on each transmission line of the network side and the load side, and digital signals are obtained through the sampling circuit and the analog-to-digital converter, and the DSP controls the digital signals to realize signal tracking and interference suppression.
2. An integrated compensation method of an integrated compensation apparatus of an electric power system according to claim 1, characterized by comprising the steps of:
firstly, a power supply voltage phase signal and a load current fundamental frequency amplitude signal which are obtained by a sampling circuit through a network side voltage detection device and a load side fundamental wave current extraction device are subjected to digital signal acquisition through an analog-to-digital converter of a DSP, and in a control algorithm, the load current fundamental frequency amplitude signal is used as a reference current i s * The amplitude of (a) of (b) is,the phase signal of the power supply voltage extracted by the network side voltage detection device is used as a reference current i s * To obtain a reference current i s * And its differential signal i s * ′；
Secondly, obtaining the current i of the network side current detection device through a sampling circuit s Is converted into current i by an analog-to-digital converter of the DSP s In a control algorithm, the current i is measured s As an input signal of the ESO, and an output of the ESOInto three state variables, i.e. net side current signal z 1 、z 1 Is a differential signal z 2 And an amount of interference z 3 ；
Thirdly, comparing the reference current and the differential signal thereof with the network side current signal and the differential signal thereof to obtain an error epsilon 1 And ε 2 ，
Fourth, construct the proper relation to 1 And ε 2 To obtain the NLSEF control signal u 0 /b 0 ， b 0 For gain, the control signal u 0 /b 0 Is a component of the control signal for implementing signal tracking;
step five, using the z output of ESO 3 Another component-z of the control signal can be generated 3 /b 0 For suppressing the internal and external interference of the system;
sixthly, the two control components u are used 0 /b 0 And-z 3 /b 0 Adding and combining to obtain a control signal u (t), wherein-u (t) is the differential of the voltage on the AC side of the inverter, and integrating-u (t) to obtain the voltage on the AC side of the inverter;
seventhly, using Pulse Width Modulation (PWM) technology to make DSP output proper signal to control driving circuit so as to ensure that output voltage on AC side of inverter is negative value of ^ u (tau) d tau, and using inverter output voltage signal to make Jing Pingbo reactor L 1 And controlling the voltage on the inductance L of the LC filtering branch circuit to realize the tracking of the actual current to the reference current.
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| CN101651347B (en) * | 2009-09-18 | 2013-10-16 | 南京航空航天大学 | Parallel-connection type active power filter |
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| CN100337378C (en) * | 2005-01-25 | 2007-09-12 | 江苏方程电力科技有限公司 | Digitalized active power regulating energy-saving device |
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