CN109828122B - Synchronous generator angular speed measuring method suitable for dual-input power system stabilizer - Google Patents
Synchronous generator angular speed measuring method suitable for dual-input power system stabilizer Download PDFInfo
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Abstract
The invention discloses a method for measuring the angular speed of a synchronous generator suitable for a dual-input power system stabilizer, which comprises the following steps of: 1) measuring the voltage of the synchronous generator, measuring the current of the synchronous generator and generating a signal of the synchronous generator Xq; 2) synthesizing the internal potential of the synchronous generator by using the voltage and the current of the synchronous generator; 3) a frequency signal of the potential within the synchronous generator is measured. The invention can be used for accurately measuring the angular velocity signals of the double-input power system stabilizers such as PSS2A/2B, PSS3B, PSS4B and the like, and through RTDS test and field verification, the invention enables the excitation system to provide enough damping when the synchronous generator generates low-frequency oscillation, ensures the stable operation of the power system and has high measurement precision.
Description
Technical Field
The invention relates to a method for measuring the angular speed of a synchronous generator suitable for a dual-input power system stabilizer, belonging to the innovative technology of the method for measuring the angular speed of the synchronous generator suitable for the dual-input power system stabilizer.
Background
With the development of power systems and the development of unit excitation control technologies, medium and large-sized generator sets generally adopt rapid excitation regulators. The quick excitation regulator improves the response speed of a system, greatly reduces the time constant of an excitation system, reduces the damping of the system, and causes weak damping and even negative damping in the system to cause low-frequency oscillation. The generation of low-frequency oscillation of the regional power grid can cause the operation of a related section beyond the limit and the tripping of related equipment, seriously affect the safety and stability of a power system, even cause malignant cascading failure to cause large-area breakdown of the power grid, and is one of the most important problems affecting the safety and stability of the regional power grid. Therefore, an active and effective suppression measure should be taken for low-frequency oscillations.
At present, the suppression strategies for low-frequency oscillation are mainly divided into two main categories, namely a primary system strategy and a secondary system strategy. The primary system strategy is mainly to enhance the inherent damping of the grid structure lifting system. The secondary System strategy comprises a flexible alternating current transmission System, high-voltage direct current transmission, a Power System Stabilizer (PSS) and an optimal excitation control strategy (comprising linear and nonlinear optimal excitation control). Among these strategies, power system stabilizers are the most simple, effective, widely used, and economically stable measure recognized, and are currently embedded in substantially all exciter systems.
The Power System Stabilizer (PSS) is an additional excitation control, and mainly has the functions of providing an additional input (active power swing with low frequency of 0.2-2.5Hz is used as input) for an excitation system, amplifying and phase compensating the input signal according to needs to generate a control signal, and superposing the control signal on an excitation reference voltage to generate positive damping with the same effect as a damping winding of a generator and counteract negative damping generated by AVR (amplitude versus voltage) of pure voltage deviation adjustment, so that the aims of inhibiting low-frequency oscillation of the power system and improving the stability of the system are fulfilled.
Currently, the most used PSS model in domestic power systems is PSS2A/2B, whose transfer function is shown in fig. 1: in the figure: v1 is the angular velocity input signal and V2 is the electrical power input signal. The electric power is easy to measure, the angular velocity is difficult to measure directly, the electric quantity such as voltage, current and the like is required to be measured indirectly, and the accurate measurement is difficult. Therefore, the accuracy of the angular velocity signal measurement is directly related to the effect of the PSS2A/2B, and when the angular velocity signal measurement is inaccurate, the PSS may cause weak damping or even negative damping. In actual operation, the actual operation damping of the PSS2A/2B which is caused by inaccurate angular velocity signal measurement does not meet the requirement, for example, 7, 6.7.7.7.7.220 kV power plants in Guizhou have the phenomenon that the low-frequency oscillation of the power set to the system is caused by the inaccurate damping of the low-frequency band near 0.6Hz due to inaccurate angular velocity measurement of a PSS2A type power system stabilizer.
At present, there are two methods mainly used for measuring the angular speed of the generator in the PSS, and one scheme is to obtain the power angle of the generator according to a generator vector diagram, and obtain the variation of the angular speed of the generator after deriving the power angle; in another method, the change amount of the angular speed of the generator is obtained by utilizing the change rate of the internal potential Eq and the included angle of the alpha shaft in the alpha beta coordinate system of the generator.
The two schemes have the common point that the variation of the angular speed of the generator is indirectly measured. Practice proves that when the low-frequency oscillation frequency generated by the active power of the generator set is more than 1Hz, the angular speed variation measured by the two schemes is more accurate. And when the active power oscillation frequency of the generator is less than 0.7Hz, the excitation regulator has a small operation period (generally about 3.3 ms), and is insensitive to oscillation frequency below 0.7Hz, so that the measurement of angular velocity variation is inaccurate, the PSS2A/2B has poor effect, and even negative damping occurs.
Disclosure of Invention
The invention aims to provide a method for measuring the angular speed of a synchronous generator, which is suitable for a dual-input power system stabilizer. The invention can ensure that the excitation system can provide enough damping when the synchronous generator generates low-frequency oscillation, ensures the stable operation of a power system and has high measurement precision.
The technical scheme of the invention is as follows: the invention discloses a method for measuring the angular speed of a synchronous generator applicable to a dual-input power system stabilizer, which comprises the following steps of:
1) measuring the voltage of the synchronous generator, measuring the current of the synchronous generator and generating a signal of the synchronous generator Xq;
2) synthesizing the internal potential of the synchronous generator by using the voltage and the current of the synchronous generator;
3) a frequency signal of the potential within the synchronous generator is measured.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a synchronous generator angular velocity measuring method suitable for a double-input power system stabilizer, which is characterized in that generator voltage, current signals and Xq signals obtained by measurement in an excitation system are utilized, the internal potential of a synchronous generator is synthesized according to a synchronous generator vector diagram, the internal potential signals are modulated through a modulation circuit, so that the frequency of the internal potential Eq is obtained, the internal potential signals can accurately reflect the change condition of the angular velocity of the synchronous generator during low-frequency oscillation, and can be used as angular velocity input signals of power system stabilizers such as PSS2A/2B, PSS4B and the like after modulation, so that the excitation system can provide sufficient damping when the synchronous generator generates low-frequency oscillation, and the stable operation of the power system is ensured. The invention obtains the generator angular velocity signal by measuring the potential frequency in the synchronous generator, the frequency range is 50Hz +/-2 Hz when the generator generates low-frequency oscillation, and the measurement precision is high.
Drawings
FIG. 1 is a diagram of a prior art PSS2A/2B transfer function;
FIG. 2 is a schematic diagram of the present invention;
FIG. 3 is a vector diagram of the synchronous generator of the present invention;
FIG. 4 is a schematic diagram of a secondary measurement loop of the generator PT of the present invention;
FIG. 5 is a schematic diagram of a current measurement circuit of the present invention;
FIG. 6 is a schematic diagram of an internal potential synthesis loop of the present invention;
FIG. 7 is a schematic diagram of a potential frequency measurement loop within the generator of the present invention;
fig. 8 is a graph of line active fluctuation for different PSS schemes.
Detailed Description
The general implementation scheme block diagram of the invention is shown in fig. 2, and the method for measuring the angular speed of the synchronous generator applicable to the dual-input power system stabilizer comprises the following steps:
1) measuring the voltage of the synchronous generator, measuring the current of the synchronous generator and generating a signal of the synchronous generator Xq;
2) synthesizing the internal potential of the generator by using the voltage and the current of the synchronous generator;
3) a frequency signal of the potential within the synchronous generator is measured.
The method for measuring the voltage of the synchronous generator, measuring the current of the synchronous generator and generating the signal of the synchronous generator Xq in the step 1) comprises the following steps: firstly, designing a generator voltage measuring circuit, designing a generator current measuring circuit and designing a synchronous generator Xq signal generating circuit, and then respectively measuring.
The method for synthesizing the internal potential of the generator by utilizing the voltage and the current of the generator in the step 2) comprises the following steps: and carrying out vector synthesis on the voltage loop and the current loop of the generator by using the internal potential synthesis circuit to obtain the internal potential of the generator. And obtaining the internal potential of the generator according to the internal potential vector diagram of the generator.
And 3) measuring the potential frequency signal in the synchronous generator by using the FPGA chip. And (3) carrying out high-speed sampling on potential frequency signals in the generator by using an FPGA chip to obtain accurate angular speed of the generator, wherein the sampling frequency is 33 MhZ.
The vector diagram of the synchronous generator is shown in fig. 3, and it is known from the vector diagram of the synchronous generator that:
In this embodiment, a generator voltage measurement circuit is shown in fig. 4, and the generator voltage measurement circuit is shown in fig. 5, and includes a voltage transformer TV3, an operational amplifier circuit composed of an operational amplifier chip U1, resistors R14 to R17, R28, R29, R31, capacitors C7, C9, and C11, where a bridge rectifier circuit composed of resistors R16, R17, R28, and R29 is connected to an input terminal of the voltage transformer TV3, a parallel circuit composed of resistors R14 and R15 is connected to an input terminal of the voltage transformer TV3, a capacitor C9 is connected in parallel with a resistor R31 and connected to an input terminal of the operational amplifier chip U1, the operational amplifier chip U1 is grounded through capacitors C7 and C11, the voltage transformer TV3 performs isolation and transmission functions, and an external strong voltage signal passes through the voltage transformer and the operational amplifier circuit to achieve an isolation and amplification function of the signal. The synchronous generator measuring loop mainly comprises a voltage transformer TV3 and an operational amplifier circuit related to an operational amplifier chip U1. The voltage transformer has the functions of isolation and transmission, and the external strong voltage signal realizes the function of isolating and amplifying the signal through the voltage transformer and the operational amplifier circuit.
In this embodiment, the generator current measurement circuit is shown in fig. 5, and includes an operational amplifier circuit composed of a current transformer CT4 and an operational amplifier chip U17, a resistor R100, capacitors C74, C77, and C78, wherein the resistor R100 is connected in parallel with the capacitor C77 and is connected to an input terminal of the operational amplifier chip U17, the operational amplifier chip U17 is grounded through the capacitors C74 and C78, and the current transformer and the operational amplifier circuit realize the isolation and amplification functions of the current signal at the generator terminal of the synchronous generator. In fig. 5, Ig + and Ig-are current signals output by the CT, and are converted into Ig signals output by the secondary side of the current transformer of the generator through isolation transformation.
In this embodiment, the generator internal potential synthesizing circuit is shown in fig. 6, and the internal potential synthesizing circuit for synthesizing the generator internal potential by using the generator voltage and current includes an auxiliary circuit composed of a chip U5, resistors R36, R42, R98, and capacitors C8 and C12, where three vectors of the synchronous generator terminal current Ig, the synchronous generator Xq, and the synchronous generator terminal voltage Ux are connected to the input end of the chip U5 through the resistors R36, R98, and R42, the chip U5 is grounded through the capacitors C8 and C12, and the chip U5 realizes the vector synthesizing function of the synchronous generator terminal current Ig, the synchronous generator terminal voltage Ux, and the synchronous generator Xq. In this embodiment, the chip U5 is an AD633 chip.
In fig. 6, the Xq signal comes from the excitation regulator AVR, is output to the AD633 chip through the regulator DA port after parameter setting, and the AD633 is an analog multiplier, which realizes vector synthesis among three vectors of Ux, Ig and Xq, and forms a generator internal potential Eq vector signal.
In this embodiment, the loop for measuring the potential frequency signal in the synchronous generator is shown in fig. 7, and includes a chip U10C, resistors R48, R50, R56, R65, and R69 to R72, wherein the input ac signal is input
The input end of the chip U10C is connected with the negative input end of the chip U10C through a resistor R48, the positive input end of the chip U10C is grounded through a resistor R65, a resistor R56 is connected between the positive input end and the output end of the chip U10C, the output end of the chip U10C is connected with a parallel circuit consisting of resistors R70 and R71 through a resistor R69, the other end of the resistor R70 is grounded through a resistor R72, the other end of the resistor R71 is connected with a power supply, and the chip U10C is used for connecting an input alternating current signal
Setting as square wave signal capable of measuring frequency
. Adopting FPGA to obtain square wave signal
And carrying out high-speed sampling, and calculating the frequency of the measured signal according to the code values corresponding to the high and low levels obtained by sampling. The chip U10C employs a voltage comparator LM 239D.
In fig. 7, the signal of the internal electric potential Eq of the generator is shaped into a square wave signal F by a voltage comparator LM239D and directly enters an IO port of the FPGA to carry out frequency measurement. The FPGA of the invention uses M2S010 type, and the highest frequency measurement range can reach 200 MHz. The measured internal potential frequency signal is converted to be used as the angular velocity input signal of the PSS.
According to the RTDS and the field test, the angular velocity measuring method disclosed by the invention can obviously improve the low-frequency range measuring accuracy. FIG. 8 is a comparison diagram of RTDS simulation based on the PSS damping effect of two measurement methods, wherein PSS OFF is the line active power fluctuation curve of the exit of PSS, PSS1A is the input 1A single input type PSS active fluctuation curve, PSS2A Eq-f is the line active fluctuation curve of PSS based on potential angular frequency measurement, and PSS2A Vg is the line active fluctuation curve of PSS based on generator power angle derivation to obtain angular velocity.
The invention can ensure that the excitation system can provide enough damping when the synchronous generator generates low-frequency oscillation, ensures the stable operation of a power system and has high measurement precision. The invention can particularly remarkably improve the damping of the power system stabilizer to the low-frequency oscillation mode below 0.7 Hz.
Claims (7)
1. A method for measuring the angular speed of a synchronous generator of a dual-input power system stabilizer is characterized by comprising the following steps of:
1) measuring the voltage of the synchronous generator, measuring the current of the synchronous generator and generating a signal of the synchronous generator Xq;
2) synthesizing the internal potential of the synchronous generator by using the voltage and the current of the synchronous generator;
3) measuring a frequency signal of the potential in the synchronous generator;
the method for synthesizing the internal potential of the synchronous generator by utilizing the voltage and the current of the synchronous generator in the step 2) comprises the following steps: vector synthesis is carried out on a voltage loop and a current loop of the generator by using an internal potential synthesis circuit, and the internal potential of the generator is obtained from an internal potential vector diagram of the generator;
the internal potential synthesis circuit for synthesizing the internal potential of the generator by using the voltage and the current of the generator comprises an auxiliary circuit consisting of a chip U5, a resistor R36, a resistor R42, a resistor R98 and capacitors C8 and C12, wherein three vectors of the current Ig at the generator end of the synchronous generator, the synchronous generator Xq and the voltage Ux at the generator end of the synchronous generator are respectively connected to the input end of the chip U5 through the resistors R36, R98 and R42, the chip U5 is grounded through the capacitors C8 and C12, and the chip U5 realizes the vector synthesis function of the current Ig at the generator end of the synchronous generator, the voltage Ux at the generator end of the synchronous generator and the Xq of the; chip U5 is an AD633 chip.
2. The method for measuring the angular speed of the synchronous generator of the dual-input power system stabilizer according to claim 1, wherein the step 1) of measuring the voltage of the synchronous generator, measuring the current of the synchronous generator and generating the signal of the synchronous generator Xq comprises the following steps: firstly, designing a voltage measuring circuit of the synchronous generator, designing a current measuring circuit of the synchronous generator and designing a generating circuit of Xq signals of the synchronous generator, and then respectively measuring.
3. The method for measuring the angular speed of the synchronous generator of the dual-input power system stabilizer according to claim 1, wherein the step 3) uses an FPGA chip to measure the potential frequency signal in the synchronous generator.
4. The dual input power system stabilizer synchronous generator angular velocity measurement method according to claim 2, the generator voltage measuring circuit is characterized by comprising a voltage transformer TV3, an operational amplifier circuit consisting of an operational amplifier chip U1, resistors R14-R17, R28, R29 and R31, capacitors C7, C9 and C11, the bridge rectifier circuit composed of resistors R16, R17, R28 and R29 is connected to the input end of a voltage transformer TV3, the parallel circuit composed of resistors R14 and R15 is connected to the input end of the voltage transformer TV3, a capacitor C9 is connected in parallel with a resistor R31 and is connected to the input end of an operational amplifier chip U1, the analog ground pin of the operational amplifier chip U1 is grounded through capacitors C7 and C11, the voltage transformer TV3 has the functions of isolation and transmission, and external strong voltage signals are isolated and amplified through the voltage transformer and the operational amplifier circuit.
5. The method of claim 2, wherein the generator current measurement circuit comprises a current transformer CT4, an operational amplifier circuit comprising an operational amplifier chip U17, a resistor R100, a capacitor C74, a capacitor C77, and a capacitor C78, the resistor R100 is connected in parallel with the capacitor C77 and is connected to an input terminal of the operational amplifier chip U17, the operational amplifier chip U17 is grounded via the capacitors C74 and C78, and the current transformer and the operational amplifier circuit achieve the functions of isolating and amplifying the current signal at the generator terminal.
6. The method of claim 2, wherein the Xq signal is set by the excitation regulator, and the value set inside the excitation regulator is converted into the Xq signal required by the system by the D/a conversion chip.
7. The method for measuring the angular speed of the synchronous generator with the dual-input power system stabilizer of claim 3, wherein the circuit for measuring the frequency signal of the potential in the synchronous generator comprises an operational amplifier consisting of a chip U10C, resistors R48, R50, R56, R65 and R69-R72, wherein the input AC signal E isqThe input end of the chip U10C is connected with the negative input end of the chip U10C through a resistor R48, the positive input end of the chip U10C is grounded through a resistor R65, a resistor R56 is connected between the positive input end and the output end of the chip U10C, the output end of the chip U10C is connected with a parallel circuit consisting of resistors R70 and R71 through a resistor R69, the other end of the resistor R70 is grounded through a resistor R72, the other end of the resistor R71 is connected with a power supply, and the chip U10C is used for connecting an input alternating current signal E with theqSetting a square wave signal F capable of measuring frequency, sampling the obtained square wave signal F by adopting an FPGA, and calculating the frequency of the measured signal according to code values corresponding to high and low levels obtained by sampling.
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| CN103944536A (en) * | 2013-01-21 | 2014-07-23 | 常州大学 | Synthesis method for radio frequency vector signals |
| CN104268426A (en) * | 2014-10-13 | 2015-01-07 | 国家电网公司 | Calculation method of rotating speed Omega of generator rotor in power system stabilizer (PSS4B) model |
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Patent Citations (6)
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| CN101358989A (en) * | 2008-09-12 | 2009-02-04 | 长江三峡能达电气有限责任公司 | Method for measuring rotate speed of synchronous generator based on circulation method |
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| JP2012157101A (en) * | 2011-01-24 | 2012-08-16 | Toshiba Corp | Excitation controller of synchronous machine |
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