CN109586310B - Parallel operation phase modulator coordination control method based on difference adjustment - Google Patents
Parallel operation phase modulator coordination control method based on difference adjustment Download PDFInfo
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- CN109586310B CN109586310B CN201811414049.6A CN201811414049A CN109586310B CN 109586310 B CN109586310 B CN 109586310B CN 201811414049 A CN201811414049 A CN 201811414049A CN 109586310 B CN109586310 B CN 109586310B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a phase modulator coordinated control method of parallel operation based on difference adjustment, which adopts a control mode of voltage closed loop superposition slow reactive power closed loop aiming at a large-capacity phase modulator, carries out the on-off of difference adjustment function according to the voltage condition of a system and the action condition of a reactive loop, and puts in difference adjustment when the voltage of the system exceeds a set steady-state range; when the system voltage is in a steady-state range, the current reactive power is adjusted when the reactive power distance reactive power target value exceeds a set value, and when the reactive power and the reactive power target value are smaller than the set value, the difference adjusting function is quitted. The invention can improve the reactive power regulation stability of the phase regulator with large capacity running in parallel while ensuring enough transient regulation margin of the phase regulator, and can play the role of supporting the phase regulator on alternating voltage to the maximum extent.
Description
Technical Field
The invention belongs to the technical field of motor excitation control, and particularly relates to a phase modulator coordinated control method for parallel operation based on difference adjustment.
Background
The excitation system is the core for realizing the functions of the phase modulator and has an important effect on improving the transient stability of the power system. The requirements of the phase modulator excitation system are different from the requirements of a conventional generator, and the phase modulator excitation system has the requirements of higher strong excitation capacity (not less than 2 times), higher voltage response sensitivity, faster reactive power regulation speed and amplitude and the like. The phase modulator operating conditions and dynamic characteristics requirements under system fault conditions are different from those of conventional generators. The excitation control of a common generator is mainly voltage control, when a power system normally operates, a load always fluctuates, the power of a synchronous generator correspondingly changes, and along with the fluctuation of the load, the excitation current needs to be adjusted to maintain the voltage of a generator end or a certain point in the system at a given level. When the synchronous phase modulator operates normally and stably, the reactive power is necessary to be controlled to be close to a certain reference value so as to improve the possible reactive power output of the phase modulator under the transient condition and play the supporting role of the phase modulator on the alternating voltage to the maximum extent.
In order to fix the output of a phase modulator under a steady state condition at a certain value, a voltage closed loop and slow reactive closed loop superposed control mode is adopted in the excitation control of the existing phase modulator, because the reactive closed loop under the steady state condition is relatively slow in regulation speed, and the existing high-capacity phase modulators are all in a high-voltage side parallel connection mode, in order to realize the operation stability of each phase modulator during the slow reactive regulation, a measure which is beneficial to the reactive distribution among all the phase modulators is necessary to be introduced, and the exertion of the transient reactive compensation effect cannot be influenced, so that a technical scheme of a phase modulator coordinated control method for parallel operation based on difference adjustment is urgently needed to be provided.
Disclosure of Invention
Aiming at the problems, the invention provides a phase modulator coordinated control method for parallel operation based on difference adjustment, which can be applied to a phase modulator excitation control system, can realize the function of on-off difference adjustment according to the real-time condition, not only ensures the stability of the operation of the parallel operation high-capacity phase modulator during reactive power adjustment, but also can meet the requirement of the sufficient reactive power adjustment capability of a camera under the condition of transient change.
The technical purpose is achieved, the technical effect is achieved, and the invention is realized through the following technical scheme:
a phase modulation machine coordination control method based on difference adjustment in parallel operation comprises the following steps:
setting a control mode of a phase modulator as a control mode of voltage closed loop superposition slow reactive power closed loop;
judging the state of the phase modulator;
and judging whether a phase difference adjusting function is put into the phase adjuster according to the state of the phase adjuster and the set phase difference adjusting input condition so as to realize the coordination control of the phase adjuster operating in parallel.
Preferably, the determining whether to use the difference adjustment function according to the state of the phase modulator and the set difference adjustment input condition includes:
the adjustment function is switched on or off according to the system voltage condition of the phase modifier and the action condition of the slow reactive power closed loop, and when the system voltage of the phase modifier exceeds a set steady-state range, the adjustment is switched on; when the system voltage of the phase modulator is in a steady-state range, the difference adjustment is carried out under the condition that the current reactive power distance reactive power target value exceeds a set value, and when the current reactive power distance reactive power target value is smaller than the set value, the difference adjustment function is quitted.
Preferably, when the system voltage of the phase modulator exceeds a set steady-state range, the phase difference is adjusted, specifically:
when the system voltage of the phase modulator exceeds the set steady state range, the phase modulator is judged to be in an unsteady state, and then the phase modulation function is put into use.
Preferably, when the system voltage of the phase modulator exceeds a set steady-state range, the method specifically comprises the following steps:
when the system voltage of the phase modifier meets the following formula, the system voltage of the phase modifier is judged to exceed the set steady-state range,
Us>Usmax
or Us＜Usmin
Wherein, UsFor system voltage of phase-modulators, UsminSetting a lower limit of a range for a system voltage steady state; u shapesmaxAnd setting the upper range limit for the system voltage steady state.
Preferably, when the system voltage of the phase modulator is in a steady-state range, and the current reactive power distance reactive power target value exceeds a reference value, the difference adjustment is performed, and when the current reactive power distance reactive power target value is smaller than the reference value, the difference adjustment function is exited, specifically:
when the system voltage of the phase modulator is in a steady state range, judging that the phase modulator is in a steady state;
carrying out phase modifier reactive power measurement QGWith reference value QrefIf the current phase modulator reactive power measured value Q isGDistance reference value QrefIf the difference is larger than +/-alpha% of the reference value, the difference adjusting function is put into operation; if the phase modulator reactive power measurement value QGDistance reference value QrefLess than ± α% of the reference value, the adjustment function is exited.
Preferably, when the system voltage of the phase modulator is in a steady-state range, the method specifically comprises:
when the system voltage of the phase modulator meets the following formula, the system voltage of the phase modulator is determined to be in a steady state range,
Usmin≤Us≤Usmax
wherein, UsFor system voltage of phase-modulators, UsminSetting a lower limit of a range for a system voltage steady state; u shapesmaxAnd setting the upper range limit for the system voltage steady state.
Preferably, the difference adjusting function is specifically:
terminal voltage reference value U of phase modulatorrefSuperimposing a component related to the reactive current, i.e. the per unit value I of the reactive currentQMultiplying by a coefficient k and superposing on a terminal voltage reference value U of a phase modulatorrefThe above.
Preferably, the per unit value I of the reactive currentQMultiplying by a coefficient k to obtain a difference adjustment coefficient, wherein the specific calculation formula is as follows:
k*IQ
wherein, IQK is the coefficient per unit value of the reactive current.
Preferably, the system voltage of the phase modulator refers to the phase modulator outlet transformer high side voltage.
The invention has the beneficial effects that:
the invention provides a phase modulator coordinated control method for parallel operation based on difference adjustment, which can be applied to a phase modulator excitation control system, can realize the function of on-off difference adjustment according to the real-time condition, not only ensures the stability of the operation of a large-capacity phase modulator for parallel operation during reactive power adjustment, but also can meet the requirement of the sufficient reactive power adjustment capability of a camera under the condition of transient change.
Drawings
FIG. 1 is a control model diagram according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
As shown in fig. 1, the invention provides a phase modulation machine coordination control method based on phase difference adjustment for parallel operation, which specifically comprises the following steps:
fig. 1 is a model diagram of a control method of a phase modulator excitation system controlled by voltage and reactive power double closed loops. The invention relates to a phase modulator excitation system control method based on voltage and reactive power double closed-loop control, which can be applied to a phase modulator excitation system to adjust and control the reactive power of a phase modulator and the terminal voltage.
Thus is provided withThe control model of the excitation system of the phase modifier of the meter is shown in figure 1, where Kp、KI、KDPID parameters are respectively controlled for a voltage main loop (namely a voltage closed loop); kPQ、KIQ、KDQRespectively are reactive power control loop (namely slow reactive power closed loop) PID parameters; u shaperefThe terminal voltage reference value of the phase modulator; u is the measured value of the terminal voltage of the phase modulator; qrefIs a slow reactive loop reactive power reference value; qGIs a reactive power measurement; i isQIs a reactive current value; k is a coefficient; efTo output an excitation voltage; u shapesminSetting a lower limit of a range for a system voltage steady state; u shapesmaxAnd setting an upper limit of the range for the steady state of the system voltage, wherein En represents the adjustment input condition.
Setting a control mode of a phase modulator as a control mode of voltage closed loop superposition slow reactive power closed loop, namely taking terminal voltage of the phase modulator as a control target, performing proportional-integral-derivative control according to the deviation of an actual value and a target value of the current terminal voltage, and taking an operation result as excitation voltage of the phase modulator; superposing a proportional-integral-differential operation result of the deviation between the current reactive power actual value and the target value on the voltage target value of the machine terminal; and the time constant of the voltage closed-loop control link is smaller than that of the reactive loop control link.
Step (2) judging the state of the phase modulator, specifically:
when the system voltage of the phase modifier meets the following formula, the system voltage of the phase modifier is judged to exceed the set steady-state range,
Us>Usmax
or Us＜Usmin
When the system voltage of the phase modulator meets the following formula, the system voltage of the phase modulator is determined to be in a steady state range,
Usmin≤Us≤Usmax
wherein, UsFor system voltage of phase-modulators, UsminSetting a lower limit of a range for a system voltage steady state; u shapesmaxAnd setting the upper range limit for the system voltage steady state.
And (3) judging whether a difference adjusting function is put into according to the state of the phase modifier and the set difference adjusting input condition to realize the coordination control of the phase modifiers running in parallel, which specifically comprises the following steps:
the adjustment function is switched on or off according to the system voltage condition of the phase modifier and the action condition of the slow reactive power closed loop, and when the system voltage of the phase modifier exceeds a set steady-state range, the adjustment is switched on; when the system voltage of the phase modulator is in a steady-state range, the difference adjustment is carried out under the condition that the current reactive power distance reactive power target value exceeds a set value, and when the current reactive power distance reactive power target value is smaller than the set value, the difference adjustment function is quitted.
As shown in fig. 1, in an embodiment of the present invention, specifically, the following are performed:
when the system voltage of the phase modulator exceeds a set steady state range, judging that the phase modulator is in an unsteady state, and putting into a phase difference adjusting function;
when the system voltage of the phase modulator is in a steady state range, judging that the phase modulator is in a steady state;
carrying out phase modifier reactive power measurement QGWith reference value QrefIf the current phase modulator reactive power measured value Q isGDistance reference value QrefIf the difference is larger than +/-alpha% of the reference value, the difference adjusting function is put into operation; if the phase modulator reactive power measurement value QGDistance reference value QrefLess than ± α% of the reference value, the adjustment function is exited.
The difference adjusting function is specifically a voltage reference value U at the terminal of the phase modulatorrefSuperimposing a component related to the reactive current, i.e. the per unit value I of the reactive currentQMultiplying by a coefficient k and superposing on a terminal voltage reference value U of a phase modulatorrefPer unit value I of the reactive currentQMultiplying by a coefficient k to obtain a difference adjustment coefficient, wherein the specific calculation formula is as follows:
k*IQ
wherein, IQK is the coefficient per unit value of the reactive current.
The steady state of the adjustment coefficient and the system voltage setting in the processRange (i.e. lower limit U of steady state setting range of system voltage)sminAnd the upper limit U of the steady state setting range of the system voltagesmax) And setting according to the actual operation condition of the power grid.
The invention realizes the stability of parallel operation of the large-capacity phase modulators during reactive power regulation by switching-in and switching-out adjustment functions according to actual working conditions on the basis of voltage closed loop, and plays the supporting role of the phase modulators on alternating voltage to the maximum extent.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. A phase modulation machine coordination control method for parallel operation based on difference modulation is characterized by comprising the following steps:
setting a control mode of a phase modulator as a control mode of voltage closed loop superposition slow reactive power closed loop; the method specifically comprises the following steps: setting a control mode of a phase modulator as a control mode of voltage closed loop superposition slow reactive power closed loop, namely taking terminal voltage of the phase modulator as a control target, performing proportional-integral-differential control according to the deviation of the actual value and the target value of the current terminal voltage, and taking the operation result as the excitation voltage of the phase modulator; superposing a proportional-integral-differential operation result of the deviation between the current reactive power actual value and the target value on the voltage target value of the machine terminal; wherein the time constant of the voltage closed-loop control link is smaller than that of the reactive loop control link;
judging the state of the phase modulator, specifically:
when the system voltage of the phase modifier meets the following formula, the system voltage of the phase modifier is judged to exceed the set steady-state range,
Us>Usmax
or Us<Usmin；
When the system voltage of the phase modulator meets the following formula, the system voltage of the phase modulator is determined to be in a steady state range,
Usmin≤Us≤Usmax；
wherein, UsFor system voltage of phase-modulators, UsminSetting a lower limit of a range for a system voltage steady state; u shapesmaxSetting a range upper limit for a system voltage steady state;
judging whether a phase difference adjusting function is put into according to the state of the phase modulator and a set phase difference adjusting input condition so as to realize the coordinated control of the phase modulators running in parallel, and specifically comprising the following steps:
the adjustment function is switched on or off according to the system voltage condition of the phase modifier and the action condition of the slow reactive power closed loop, and when the system voltage of the phase modifier exceeds a set steady-state range, the adjustment is switched on; when the system voltage of the phase modulator is in a steady-state range, and the current reactive power distance reactive power target value exceeds a set value, the difference adjustment is carried out, and when the current reactive power distance reactive power target value is less than the set value, the difference adjustment function is quitted, specifically:
when the system voltage of the phase modulator exceeds a set steady state range, judging that the phase modulator is in an unsteady state, and putting into a phase difference adjusting function;
when the system voltage of the phase modulator is in a steady state range, judging that the phase modulator is in a steady state;
carrying out phase modifier reactive power measurement QGWith reference value QrefIf the current phase modulator reactive power measured value Q isGDistance reference value QrefIf the difference is larger than +/-alpha% of the reference value, the difference adjusting function is put into operation; if the phase modulator reactive power measurement value QGDistance reference value QrefIf the deviation is less than +/-alpha% of the reference value, the deviation adjusting function is quitted;
the difference adjusting function is specifically a voltage reference value U at the terminal of the phase modulatorrefSuperimposing a component related to the reactive current, i.e. the per unit value I of the reactive currentQMultiplying by a coefficient k and superposing on a terminal voltage reference value U of a phase modulatorrefPer unit value I of the reactive currentQMultiplying by a coefficient k to obtain a difference adjustment coefficient, wherein the specific calculation formula is as follows:
k*IQ；
wherein, IQK is the coefficient per unit value of the reactive current.
2. The phase modulation machine coordination control method based on the phase difference adjustment in parallel operation is characterized in that: the system voltage of the phase modulator refers to the high-voltage side voltage of an outlet transformer of the phase modulator.
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| CN108092274A (en) * | 2017-12-05 | 2018-05-29 | 国电南瑞科技股份有限公司 | The phase modifier excitation system control method of voltage and reactive power double-closed-loop control |
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| CN104821757A (en) * | 2015-04-10 | 2015-08-05 | 国电南瑞科技股份有限公司 | Synchronous motor excitation system control method based on real-time state internal potential control |
| JP2018057056A (en) * | 2016-09-26 | 2018-04-05 | 三菱電機株式会社 | Voltage reactive power control device |
| CN108092274A (en) * | 2017-12-05 | 2018-05-29 | 国电南瑞科技股份有限公司 | The phase modifier excitation system control method of voltage and reactive power double-closed-loop control |
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