CN114156911A - Primary frequency modulation performance optimization method under hydroelectric generating set opening degree mode - Google Patents
Primary frequency modulation performance optimization method under hydroelectric generating set opening degree mode Download PDFInfo
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- H—ELECTRICITY
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- H—ELECTRICITY
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Abstract
The invention discloses a method for optimizing primary frequency modulation performance of a hydroelectric generating set in an opening mode, which comprises the following steps: when the unit is in grid-connected operation, the speed regulating system obtains the current frequency value f (i) of the system through measurement and judges whether the primary frequency regulation of the unit acts; when the speed regulating system judges the primary frequency modulation action of the unit, the speed regulating system collects the characteristic parameter K of the unit at the same time1And operating head parameter K2Adjusting the primary frequency modulation action quantity of the unit according to the current unit characteristics and the running water head information, thereby achieving the aim of optimizing the primary frequency modulation performance of the unit; the problem that in the prior art, due to the nonlinear characteristic of the hydroelectric generating set, the difference of the active power variation of different sets under different operating water heads is large, and the requirement of primary frequency modulation load variation cannot be met when the set with large water head variation runs at a low water level is solved; the integral adjusting performance of the unit is seriously degraded, and the like.
Description
Technical Field
The invention belongs to the technical field of primary frequency modulation of hydroelectric generating sets, and particularly relates to a method for optimizing primary frequency modulation performance of a hydroelectric generating set in an opening mode.
Background
Along with large-scale production of large and medium-sized hydroelectric generating sets, the occupation ratio of the hydroelectric generating sets in a power grid is continuously improved, the problem that the hydroelectric generating sets influence the frequency stability of a power system is gradually reflected, and the quality of the adjustment quality and the operation reliability of the hydroelectric generating sets directly influence the safe and reliable operation and the power quality of the hydroelectric generating sets and even the whole power system. In a power grid, the demand of a user on electric energy and the electric energy generated by a power generation enterprise need to be kept in a balanced state, the power grid needs to be adjusted when unbalance occurs, and the adjustment means mainly comprises primary frequency modulation and automatic power generation control. In the running process of the hydroelectric generating set, primary frequency modulation control is a basic function of the running of the speed regulating system of the hydroelectric generating set, and when the variable quantity of the power grid frequency exceeds a frequency dead zone, the speed regulating system of the hydroelectric generating set correspondingly changes the load carried by the hydroelectric generating set according to the variable quantity of the frequency. The opening mode has the advantages of high operation reliability, strong regulation stability and the like, and is always the main operation mode of the speed regulating system of the hydroelectric generating set. For a hydroelectric generating set operated in an opening mode, under the condition of a certain permanent slip, the primary frequency modulation adjustment amount is determined by frequency deviation, and the frequency deviation of a power grid is generally smaller, so that the primary frequency modulation adjustment amount is relatively smaller. Meanwhile, due to the influence of load adjustment nonlinearity of the hydroelectric generating set, when the running water heads of the generating set are different, the difference of the primary frequency modulation performance of the generating set is larger under the same permanent state slip ratio and the same power grid frequency deviation.
Generally speaking, for a hydroelectric generating set with a large variation range of an operating head, when the hydroelectric generating set is operated in an opening mode, the difference of primary frequency modulation performance is large under the operating conditions of a high head and a low head. For a hydroelectric generating set operating in an opening mode, when the frequency of a power grid reaches or exceeds a primary frequency modulation dead zone, the opening degree (increasing or decreasing the opening degree) of a primary frequency modulation action of the hydroelectric generating set is in direct proportion to the permanent state slip ratio and the frequency deviation no matter how large the operating water head of the hydroelectric generating set is. Due to the nonlinear characteristic of the hydroelectric generating set, the difference of the active power variation of different generating sets under different operating water heads is large, and the requirement of primary frequency modulation load variation cannot be met when the generating set with large water head variation runs at a low water level. On the other hand, under the influence of various factors of water, machinery and electricity in the operating environment, although the primary frequency modulation performance of the hydroelectric generating set speed regulating system is greatly improved when the power mode is operated, the integral regulating performance of the hydroelectric generating set is seriously degraded.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the method is used for solving the problems that in the prior art, the difference of active power variation of different sets under different running water heads is large due to the nonlinear characteristic of the hydroelectric generating set, and the requirement of primary frequency modulation load variation cannot be met when the set with large water head variation runs at a low water level; although the primary frequency modulation performance of the hydroelectric generating set speed regulation system is greatly improved when the power mode is operated, the integral regulation performance of the hydroelectric generating set is seriously degraded, and the like.
The technical scheme of the invention is as follows:
a method for optimizing primary frequency modulation performance of a hydroelectric generating set in an opening mode is characterized by comprising the following steps: it includes: when the unit is in grid-connected operation, the speed regulating system obtains the current frequency value f (i) of the system through measurement and judges whether the primary frequency regulation of the unit acts; when the speed regulating system judges the primary frequency modulation action of the unit, the speed regulating system collects the characteristic parameter K of the unit at the same time1And operating head parameter K2And the primary frequency modulation action quantity of the unit is adjusted according to the characteristics of the current unit and the running water head information, so that the aim of optimizing the primary frequency modulation performance of the unit is fulfilled.
The method for judging whether the primary frequency modulation of the unit acts or not by the speed regulating system through measuring the current frequency value f (i) of the system comprises the following steps:
when fed-f(i)|≤fsqWhen the speed regulating system judges that the primary frequency modulation of the unit does not act, the speed regulating system judges that the unit does not act
A(i)＝AG(i)'＝AG(i)
In the formula: a (i) is the current operation opening value of the unit; a. theG(i) Calculating a given value of the opening degree of the monitoring system for the speed regulating system; a. theG(i) Is one time adjustedThe frequency action value and the opening degree of the monitoring system give a superposition value;
when fed-f(i)|≥fsqAnd then, the speed regulating system judges the primary frequency regulating action of the unit. Characteristic parameter K of speed regulation system acquisition unit1And operating head parameter K2And the formula for adjusting the primary frequency modulation action quantity of the unit according to the current unit characteristics and the running water head information is as follows:
in the formula: a (i) is the opening value of the current guide vane of the unit; a. theG(i) Calculating a given value of the opening degree of a guide vane of a monitoring system for a speed regulating system; a. theG(i) The method comprises the steps of setting a primary frequency modulation action value and a guide vane opening degree given superposition value of a monitoring system; a. themaxThe maximum value of the opening degree of the guide vane of the unit; f. ofedIs the rated frequency of the system; f (i) is the current actual frequency of the power grid; bpSetting a permanent state slip ratio for the unit; k1The characteristic parameters of the current unit are obtained; k2And the unit operation water head parameters.
For impact type hydroelectric generating set, axial flow propeller type hydroelectric generating set and mixed flow type hydroelectric generating set with water head amplitude less than 15 m, K11.10-1.15; k for axial-flow fixed-paddle type hydroelectric generating set and mixed-flow type hydroelectric generating set with water head variation of more than or equal to 15 m and less than 30 m11.25-1.30; for mixed-flow hydroelectric generating sets with water head amplitude greater than or equal to 30 m, K1＝1.40～1.45。
Unit operating head parameter K2The determination method comprises the following steps:
when in use
When the temperature of the water is higher than the set temperature,
when in use
When the temperature of the water is higher than the set temperature,
K2＝1.0；
when in use
When the temperature of the water is higher than the set temperature,
when in use
When the temperature of the water is higher than the set temperature,
K2the current unit operation water head parameter is obtained; hiThe current running water head of the unit is used; hmaxThe maximum running water head of the unit; hminThe minimum running water head of the unit; hrThe rated operation water head of the unit.
The primary frequency modulation action value comprises an increase value or a decrease value.
The invention has the beneficial effects that:
the invention has the problems of poor primary frequency modulation performance and large variation amplitude of integral electric quantity under different water head operating conditions due to the influence of the nonlinear characteristics of the hydroelectric generating set on the hydroelectric generating set operating in an opening mode. On the basis of not changing the calculation method of the permanent state slip ratio and the primary frequency modulation frequency deviation of the hydroelectric generating set, the invention adjusts (increases or decreases) the primary frequency modulation integral electric quantity in a mode of dynamically calculating the primary frequency modulation action quantity by a technical means of superposing the characteristic parameters of the hydroelectric generating set and the running water head parameters, thereby achieving the purpose of optimizing the primary frequency modulation performance of the hydroelectric generating set.
The problem that in the prior art, due to the nonlinear characteristic of the hydroelectric generating set, the difference of the active power variation of different sets under different operating water heads is large, and the requirement of primary frequency modulation load variation cannot be met when the set with large water head variation runs at a low water level is solved; although the primary frequency modulation performance of the hydroelectric generating set speed regulation system is greatly improved when the power mode is operated, the integral regulation performance of the hydroelectric generating set is seriously degraded, and the like.
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FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
A method for optimizing primary frequency modulation performance of a hydroelectric generating set under an opening mode of a speed regulation system is characterized in that A (i) is a current operation opening value of the generating set in the normal operation process of grid connection of the generating set, AG(i) Active power instruction value P issued by power plant monitoring system for speed regulation systemG(i) And the corresponding guide vane opening given value is calculated; a. theG(i) Calculating an output value for a guide vane opening corresponding to the superposition of the issued active power value and a primary frequency modulation action value (an increase value or a decrease value) by a speed regulating system; f (i) is the current frequency value of the system; bpSetting a permanent state slip ratio for the unit; f. ofedIs the rated frequency of the system; f. ofsqIs a unit primary frequency modulation frequency dead zone.
When the unit is in grid-connected operation, the speed regulating system obtains the current frequency value of the system as f (i) through measurement, and judges whether the primary frequency regulation of the unit acts:
1. when fed-f(i)|≤fsqWhen the speed regulating system judges that the primary frequency regulation of the machine set does not act, A (i) is equal to AG(i)'＝AG(i)
Wherein: a (i) is the current operation opening value of the unit;
AG(i) calculating a given value of the opening degree of the monitoring system for the speed regulating system;
AG(i) the method comprises the following steps of setting a superposition value for a primary frequency modulation action value and the opening degree of a monitoring system;
2. when fed-f(i)|≥fsqThe speed regulating system judges the primary frequency regulating action of the unit and simultaneously collects the characteristic parameter K of the unit1And operating head parameter K2And according to the characteristics and operation of the current unitAdjusting the primary frequency modulation action quantity of the unit by the running water head information, then:
wherein: a (i) is the opening value of the current guide vane of the unit;
AG(i) calculating a given value of the opening degree of a guide vane of a monitoring system for a speed regulating system;
AG(i) the method comprises the steps of setting a primary frequency modulation action value and a guide vane opening degree given superposition value of a monitoring system;
Amaxthe maximum value of the opening degree of the guide vane of the unit; e-mail
fedIs the rated frequency of the system;
f (i) is the current actual frequency of the power grid;
bpsetting a permanent state slip ratio for the unit;
K1the characteristic parameters of the current unit are obtained;
K2the unit operation water head parameter;
k in the above formula1For the characteristic parameters of the currently operating units, K is the K for an impact type hydroelectric generating set, an axial flow propeller-rotating type hydroelectric generating set and a mixed flow type hydroelectric generating set with a water head amplitude of less than 15 m11.10-1.15; k for axial-flow fixed-paddle type hydroelectric generating set and mixed-flow type hydroelectric generating set with water head variation of more than or equal to 15 m and less than 30 m11.25-1.30; for mixed-flow hydroelectric generating sets with water head amplitude greater than or equal to 30 m, K1＝1.40～1.45。
K in the above formula2As determined by the following rule,
first working
When the temperature of the water is higher than the set temperature,
the medicine is used
When the temperature of the water is higher than the set temperature,
K2＝1.0；
the product is good
When the temperature of the water is higher than the set temperature,
all-round
When the temperature of the water is higher than the set temperature,
wherein: k2The current unit operation water head parameter is obtained;
Hithe current running water head of the unit is used;
Hmaxthe maximum running water head of the unit;
Hminthe minimum running water head of the unit;
Hrthe rated operation water head of the unit;
therefore, during primary frequency modulation action, the speed regulating system needs to acquire the performance characteristics and the operating water head information of the unit and then operates the unit according to the characteristic parameter K of the current operating unit1And unit operating head parameter K2And determining the primary frequency modulation action of the unit after calculation, thereby achieving the aim of optimizing the primary frequency modulation performance of the unit.
Claims (6)
1. A method for optimizing primary frequency modulation performance of a hydroelectric generating set in an opening mode is characterized by comprising the following steps: it includes: when the unit is in grid-connected operation, the speed regulating system obtains the current frequency value f (i) of the system through measurement and judges whether the primary frequency regulation of the unit acts; when the speed regulating system judges the primary frequency modulation action of the unit, the speed regulating system collects the characteristic parameters of the unit at the same timeK1And operating head parameter K2And the primary frequency modulation action quantity of the unit is adjusted according to the characteristics of the current unit and the running water head information, so that the aim of optimizing the primary frequency modulation performance of the unit is fulfilled.
2. The method for optimizing the primary frequency modulation performance of the hydroelectric generating set in the opening degree mode according to claim 1, wherein the method comprises the following steps: the method for judging whether the primary frequency modulation of the unit acts or not by the speed regulating system through measuring the current frequency value f (i) of the system comprises the following steps:
when fed-f(i)|≤fsqWhen the speed regulating system judges that the primary frequency modulation of the unit does not act, the speed regulating system judges that the unit does not act
A(i)＝AG(i)'＝AG(i)
In the formula: a (i) is the current operation opening value of the unit; a. theG(i) Calculating a given value of the opening degree of the monitoring system for the speed regulating system; a. theG(i) The method comprises the following steps of setting a superposition value for a primary frequency modulation action value and the opening degree of a monitoring system;
when fed-f(i)|≥fsqAnd then, the speed regulating system judges the primary frequency regulating action of the unit.
3. The method for optimizing the primary frequency modulation performance of the hydroelectric generating set in the opening degree mode according to claim 1, wherein the method comprises the following steps: characteristic parameter K of speed regulation system acquisition unit1And operating head parameter K2And the formula for adjusting the primary frequency modulation action quantity of the unit according to the current unit characteristics and the running water head information is as follows:
in the formula: a (i) is the opening value of the current guide vane of the unit; a. theG(i) Calculating a given value of the opening degree of a guide vane of a monitoring system for a speed regulating system; a. theG(i) The method comprises the steps of setting a primary frequency modulation action value and a guide vane opening degree given superposition value of a monitoring system; a. themaxThe maximum value of the opening degree of the guide vane of the unit; f. ofedIs the rated frequency of the system; f (i) is the current actual frequency of the power grid; bpPermanent set for machine setThe state slip rate; k1The characteristic parameters of the current unit are obtained; k2And the unit operation water head parameters.
4. The method for optimizing the primary frequency modulation performance of the hydroelectric generating set in the opening degree mode according to claim 3, wherein the method comprises the following steps: characteristic parameter K of unit1The value taking method comprises the following steps: for impact type hydroelectric generating set, axial flow propeller type hydroelectric generating set and mixed flow type hydroelectric generating set with water head amplitude less than 15 m, K11.10-1.15; k for axial-flow fixed-paddle type hydroelectric generating set and mixed-flow type hydroelectric generating set with water head variation of more than or equal to 15 m and less than 30 m11.25-1.30; for mixed-flow hydroelectric generating sets with water head amplitude greater than or equal to 30 m, K1＝1.40～1.45。
5. The method for optimizing the primary frequency modulation performance of the hydroelectric generating set in the opening degree mode according to claim 3, wherein the method comprises the following steps: unit operating head parameter K2The determination method comprises the following steps:
when in use
When the temperature of the water is higher than the set temperature,
when in use
When the temperature of the water is higher than the set temperature,
K2＝1.0；
when in use
When the temperature of the water is higher than the set temperature,
when in use
When the temperature of the water is higher than the set temperature,
K2the current unit operation water head parameter is obtained; hiThe current running water head of the unit is used; hmaxThe maximum running water head of the unit; hminThe minimum running water head of the unit; hrThe rated operation water head of the unit.
6. The method for optimizing the primary frequency modulation performance of the hydroelectric generating set in the opening degree mode according to claim 2, wherein the method comprises the following steps: the primary frequency modulation action value comprises an increase value or a decrease value.
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