WO2012159296A1

WO2012159296A1 - Method for controlling speed of electric generating set, device and system thereof

Info

Publication number: WO2012159296A1
Application number: PCT/CN2011/076403
Authority: WO
Inventors: 徐大明; 王铮
Original assignee: 华为技术有限公司
Priority date: 2011-06-27
Filing date: 2011-06-27
Publication date: 2012-11-29
Also published as: CN103688039B; CN103688039A

Abstract

A method for controlling speed of an electric generating set and device and system thereof are provided. The method includes acquiring updated minimum fuel consumption curve of the electric generating set, detecting current output power of the electric generating set, finding the speed corresponding to output power of the electric generating set by means of the updated minimum fuel consumption curve and putting the electric generating set to work with the speed. The system can reduce impact of aging on the system performance of the electric generating set, and can put it to work on the state of maximum efficiency.

Description

Method, device and system for realizing generator group speed control

The present invention relates to the field of control technology, and in particular, to a method, device and system for realizing speed control of a generator set.

Background technique

A diesel generator set is a small-scale power generation equipment. It refers to a power machine that uses diesel as a fuel and a diesel engine as a prime mover to drive a generator to generate electricity. When the diesel generator set is running, its fuel consumption rate (fuel consumed per unit of power generation) will increase as the load decreases. For example, the fuel consumption rate of a 10% load of a naturally aspirated small diesel generator set can reach the rated fuel consumption rate. 2.5 ~ 5 times, so reducing the fuel consumption of diesel generators in low load scenarios is 4 meaningful.

As a kind of AC power source, the traditional diesel generator set has a constant frequency of output AC, so the speed of the diesel generator set needs to be kept at the rated speed; and the relationship between the speed of the diesel generator set and the fuel consumption is usually based on the characteristic curve. The form is presented as shown in Fig. 1. According to the universal characteristic curve of the diesel generator set shown in Fig. 1, under the premise that the output power is constant, the different rotational speeds of the diesel engine correspond to different fuel consumption, and the diesel power generation is found by reflecting The speed-power curve of the unit that meets the minimum fuel consumption, that is, the minimum fuel consumption curve of AA, can adjust the diesel generator set speed to the minimum fuel consumption speed in real time through feedback control, thereby achieving the purpose of reducing the fuel consumption of the diesel generator set under low load operation.

However, the current AA fuel consumption curve is usually determined when the new diesel generator set is delivered, and will not change when the diesel generator service is started. However, since the AA minimum fuel consumption curve will age with the unit. For reasons such as change, the constant AA minimum fuel consumption curve cannot meet the current fuel saving problem of diesel generators under low load operation; therefore, the existing main fuel saving schemes for diesel generators with low load operation scenarios include: Increased false load, increased Energy storage unit or speed control.

Among them, the increase of the dummy load scheme increases the load rate of the diesel generator set by increasing the dummy load, thereby lowering the fuel consumption rate. Although it can partially reduce the fuel consumption rate of the diesel generator set, the dummy load consumes energy in no way, bringing a new one. Waste, saving fuel efficiency is poor; Increasing energy storage unit program is to increase the excess energy of the diesel generator set by adding energy storage unit, and release the electric energy when the diesel generator set is not working or the load is large, but the additional equipment required by this scheme More, high cost, and when the battery is in floating charge condition, the problem of high fuel consumption rate of diesel generator set with low load can not be solved; The scheme only adjusts the fuel consumption by roughly adjusting the rotation speed, and can not achieve the good fuel economy effect of 4艮, and therefore the scheme has different speed regulation and energy saving effects on different types of diesel generator sets, and the operability and the promotionability are poor.

Summary of the invention

In view of this, embodiments of the present invention provide a method, apparatus, and system for genset speed control that reduces fuel consumption by instantaneously acquiring a minimum fuel consumption curve of a genset.

To solve the above problem, the technical solution provided by the embodiment of the present invention is as follows:

A method for controlling the speed of a generator set includes: obtaining a minimum fuel consumption curve of the genset update; detecting a current output power of the genset, and searching for the genset speed corresponding to the output power by using the updated minimum fuel consumption curve; The speed of the genset corresponding to the found output power adjusts the speed of the genset so that the current speed of the genset reaches a state that matches the standard speed corresponding to the found output power.

The device for controlling the speed of the genset includes: an obtaining unit, a receiving unit, a searching unit and a speed adjusting unit; wherein the obtaining unit is configured to obtain a minimum fuel consumption curve of the genset update; the receiving unit is configured to receive the external The current output power of the genset sent by the device; the searching unit is configured to use the low fuel consumption curve of the genset update obtained by the obtaining unit to search for the genset rotation speed corresponding to the current output power of the genset received by the receiving unit; The speed regulating unit is configured to adjust the rotation speed of the genset by using the speed searched by the searching unit, so that the current rotation speed of the genset reaches a state matching the standard rotation speed corresponding to the found output power.

A system for realizing genset speed control includes: a power sensor, a speed controller, and a speed sensor; wherein the power sensor is configured to detect an output power of the genset, and send the detection result to the speed controller The speed sensor is configured to detect a current speed of the genset, and send the detection result to the speed controller; the speed controller is configured to obtain a minimum fuel consumption curve of the genset update, and according to the minimum updated The fuel consumption curve searches for the genset speed corresponding to the output power detected by the power sensor, and then uses the found rpm and the current genset speed detected by the speed sensor to adjust the genset speed to make the current speed of the genset A state is reached that matches the standard speed corresponding to the found output power.

It can be seen that the method, the device and the system of the embodiment of the invention obtain the AA minimum fuel consumption curve of the generator set, and find the most corresponding output power on the AA minimum fuel consumption curve according to the output power of the generator set. Good speed, then based on the best speed achieved for the generator set The speed is adjusted to enable the generator set to operate at a reasonably fuel-efficient speed to maximize fuel economy.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

Figure 1 is a schematic diagram of the fuel consumption characteristic curve of a diesel generator set;

2 is a schematic flow chart of a method for realizing the speed control of a generator set according to Embodiment 1 of the present invention; FIG. 3 is a schematic diagram of a power-voltage curve obtained by using a hill climbing method/disturbance & observation method in Embodiment 1 of the present invention;

Figure 4 is a schematic diagram showing the speed-fuel consumption curve of the embodiment 1 of the present invention;

FIG. 5 is a schematic structural view of an apparatus for realizing the speed control of a generator set according to Embodiment 2 of the present invention; FIG. 6 is a schematic structural diagram of a system for realizing the speed control of a generator set according to Embodiment 3 of the present invention.

detailed description

BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without the creative work are all within the scope of the present invention.

Embodiment 1 of the present invention provides a method for realizing speed control of a generator set. As shown in FIG. 2, the method includes:

Step 110: Obtain the A-A minimum fuel consumption curve of the genset update;

In practical applications, the AA minimum fuel consumption curve of the diesel generator set update can be obtained by the principle of the traditional Hill-climbing/P&O method, wherein the updated AA curve described in the embodiment of the present invention refers to The updated AA curve obtained when the crude oil generator set does not set the AA curve; or, is the updated AA curve of the actual operation of the genset obtained by statistical calculation on the basis of the AA curve of the crude oil generator set; The hill-climbing method/disturbance & observation method is a common one in the maximum power point tracking (MPPT) method in the field of photovoltaic power generation. The obtained power-voltage curve is shown in Figure 3: at the maximum power point left The voltage and power are proportional to the side, that is, the voltage increases the power correspondingly, and the voltage decreases the power accordingly; The voltage and power are inversely proportional to the right side of the high power point, that is, the voltage increase power is correspondingly reduced, and the voltage reduction power is correspondingly increased; in the process of this voltage disturbance, if the disturbance result causes the output power to increase, the next disturbance should be maintained. In the same direction, if the result of the disturbance causes the output power to decrease, the next disturbance direction is reversed; the disturbance process repeats periodically until the maximum power point is found and oscillates around the maximum power point. At the same time, the oscillation can be reduced by reducing the step size of the disturbance; however, the small step size will slow down the convergence speed of the MPPT, so the common solution is to use a varying disturbance step and gradually decrease as it approaches the maximum power point. Considering the convergence speed and accuracy; the perturbation step size of this change can be achieved by a typical implementation, namely, the fast tracking in the first stage and the fine tracking in the second stage. The specific principle will not be described in detail herein.

The specific manner of obtaining the AA minimum fuel consumption curve (hereinafter referred to as "AA curve") of the genset update in the present embodiment is exemplified below, and the specific parameters involved are only examples, and those skilled in the art can easily understand that it can also be Other parameters and values are not specifically limited in this embodiment:

S111: preset initial A-A curve;

Among them, it can be divided into two cases: First, for the new diesel generator set or the modified original diesel generator set, it does not set the AA curve. In this case, the AA curve can be input according to the statistics, which is used as the initial The AA curve; the second is that the AA curve has been set in the diesel generator set, and in the process of obtaining the new A-A curve, the existing A-A curve is taken as the initial A-A curve;

S112: Searching for the power point corresponding to the power point on the initial AA curve for each power point of the genset; specifically, may be a predetermined time interval after the preset initial AA curve, such as 2 months. When the battery is fully charged at regular full time, the AA curve acquisition operation is performed: the integer fuel sequence of the initial AA curve power point [... 3 2 1] KW is gradually searched for the corresponding minimum fuel consumption speed in descending order; Since the power of the battery full charge is changed from large to small, it can be determined that the time between each power point and the next power point during the full charge of the battery works at the current power point.

S113: using the found speed as a starting point, changing the genset speed in steps N and forward, respectively, and separately calculating the fuel consumption value after changing the genset speed, and obtaining the lowest fuel consumption value by comparison; for example, using diesel oil For example, when the output electric power of the generator set is 10 kW, according to the principle of the mountain climbing method/disturbance & observation method, the logic for finding the mountain peak is changed to the logic for finding the valley, and the rotation speed corresponding to 10KW on the preset initial AA curve is taken as the starting point. The generator speed is changed in a positive step of 50 rpm, and the fuel consumption value is recorded after the speed changes for 1 minute. The recording time is 2 minutes; when the disturbance is changed 2 times After the direction, change to the step size lO rpm. When the direction of the ί ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ The curve is shown in Figure 4;

S114: Record the rotation speed corresponding to the minimum fuel consumption value, calculate the rotation speed value corresponding to the minimum fuel consumption value after all the power points change the genset speed, and respectively record the corresponding fuel consumption point to obtain the minimum fuel consumption curve of the genset; specifically, Find the lowest fuel consumption point in the speed-fuel consumption array corresponding to the power point obtained in step 113, and record the speed corresponding to the lowest fuel consumption point of the 10KW power point scene; similarly, in turn, respectively in the speed-fuel consumption array corresponding to other power points The speed corresponding to the lowest fuel consumption point in the other power point scene is found, and the speed corresponding to the lowest fuel consumption point of the power point is recorded corresponding to the power point to obtain the Α-Α minimum fuel consumption curve of the genset update.

Step 120: Detect a current output power of the genset, and use the Α-Α minimum fuel consumption curve to find a genset rotation speed corresponding to the output power;

In the actual operation process, the current output power of the genset, that is, the load power Ρ can be detected in real time or periodically by using a device such as a power sensor, and then the output power and the rotational speed in the AA minimum fuel consumption curve are obtained. The relationship finds the corresponding rotational speed ω at the current power.

Step 130: Adjust a current speed of the genset to make a current speed of the genset reach a state matching a standard speed corresponding to the found output power;

Specifically, when adjusting the actual/current speed of the genset, firstly, the current actual speed ω of the genset can be detected, and the speed adjustment interval of the genset is set to [ω min, ω max], and Δ ω is the speed threshold: Α, If ω, greater than ω max, adjust the speed of the genset to ω max; if ω, less than ω min, adjust the speed of the genset to ω min;

B. If 杲 ω ω, - ω Ι > Δ ω , adjust the speed of the generator set to ω, so that the diesel generator set speed reaches the optimal speed of the minimum fuel consumption;

If Ι ω, - ω Ι < Δ ω , the current speed of the genset is maintained.

It can be seen that, by using the methods of the above embodiments, the Α-Α minimum fuel consumption curve of the genset update is obtained, and the output power is found on the updated Α-Α minimum fuel consumption curve according to the output power of the genset. Corresponding optimal speed, and then adjust the speed of the generator set according to the obtained optimal speed, which can effectively reduce the influence of the generator set on the energy-saving effect of the system due to uncertain factors such as product model and performance aging, so that the generator set can work. The fuel-saving effect is maximized under the condition of reasonable fuel-saving speed. Based on the above idea, the second embodiment of the present invention further provides a device for realizing the speed control of the genset. As shown in FIG. 5, the device 500 includes: an obtaining unit 510, a receiving unit 520, and a searching unit.

530 and speed control unit 540; wherein

The obtaining unit 510 is configured to obtain an AA minimum fuel consumption curve of the genset update; the receiving unit 520 is configured to receive the current output power of the genset sent by the external device; and the searching unit 530 is configured to use the acquiring unit 510 Obtaining the AA minimum fuel consumption curve of the genset update, and searching for the genset rotation speed corresponding to the current output power of the genset received by the receiving unit 520;

The speed control unit 540 is configured to adjust the rotation speed of the genset by using the speed detected by the searching unit 530, so that the current rotation speed of the genset reaches a standard speed corresponding to the used output power. state.

The obtaining unit 510 may further include (not shown in the figure): a setting module, configured to set an initial AA curve; a query module, configured to set an initial AA in the setting module for each power point of the genset Finding a speed corresponding to the power point on the curve; a statistics module, configured to use the speed found by the query module as a starting point, respectively change the speed of the generator set by using the step N and the reverse direction respectively, and respectively correspondingly change the speed of the generator set to correspond to The fuel consumption value is obtained by comparing the lowest fuel consumption value; the recording module is configured to record the speed corresponding to the lowest fuel consumption value of the fuel consumption value of the statistical module corresponding to the power point, and the corresponding record array is the generator A - A minimum fuel consumption curve.

In addition, the receiving unit 520 is further configured to receive the current actual speed ω of the genset sent by the external device; correspondingly, the speed adjusting unit 540 may further include (not shown): a processing module, configured to generate power The unit speed adjustment interval is [ω min, ω max], and the speed control threshold is Δ ω; and the comparison module is configured to compare the speeds ω, ω min, ω max and Δ ω found by the searching unit 530, respectively. And sending the comparison result to the adjustment module; the adjustment module is configured to receive the comparison result sent by the comparison module, and adjust the rotation speed of the genset according to the comparison result, so as to make the rotation speed of the genset and use the found output power Corresponding standard speed matching state; specific,

Α, if ω ω ' is greater than ω max, the adjustment module adjusts the speed of the genset to ω max; if ω, less than ω min, the adjustment module adjusts the speed of the genset to ω min;

B. If Ι ω, - ω Ι > Δ ω , the adjustment module adjusts the speed of the genset to ω ', so that the diesel generator set speed reaches the optimal speed of the minimum fuel consumption; C, if Ι ω, - ω Ι < Δ ω , keep the current speed of the generator set unchanged. In addition, the embodiment 3 of the present invention further provides a system for realizing the speed control of the genset. As shown in FIG. 6, the system 600 includes: a power sensor 610, a speed controller 620, and a speed sensor 630;

The power sensor 610 is configured to detect the output power of the genset, and send the detection result to the speed controller 630;

The speed sensor 620 is used to detect the current speed of the genset, and send the detection result to the speed controller 630;

The speed controller 630 is configured to acquire a minimum fuel consumption curve of the genset update, and search for the genset rotation speed corresponding to the output power detected by the power sensor 610 according to the updated minimum fuel consumption curve, and then use the found The rotational speed and the current rotational speed of the genset detected by the rotational speed sensor 620 adjust the rotational speed of the genset so that the rotational speed of the genset reaches a state that matches the standard rotational speed corresponding to the found output power.

It should be noted that those skilled in the art can easily understand that the device for realizing the genset rotation speed control described in the above embodiments can also exist as a part of other systems, and control the rotation speed of the genset in the system and the above embodiment. The descriptions in the above are consistent, and thus other systems including the apparatus for realizing the genset rotation speed control in the above embodiments are also included in the scope of protection of the present application, and will not be described herein.

A person skilled in the art will further appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software or a combination of both, in order to clearly illustrate hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the embodiments of the present invention.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be implemented directly in hardware, a software module executed by a processor, or a combination of both. Software modules can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technical fields. Any other form known In the storage medium.

The above description of the disclosed embodiments enables those skilled in the art to make or use the embodiments of the invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the embodiments of the invention. . Therefore, the present embodiments of the invention are not to be limited to the embodiments shown herein, but are to be accorded to the broadest scope of the principles and novel features disclosed herein.

The above are only the preferred embodiments of the present invention, and are not intended to limit the embodiments of the present invention. Any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the embodiments of the present invention, are It should be included in the scope of protection of the embodiments of the present invention.

Claims

Rights request

A method for controlling the speed of a generator set, characterized in that it comprises:

Obtain the minimum fuel consumption curve for the genset update;

Detecting the current output power of the genset;

Using the updated minimum fuel consumption curve to find a standard speed corresponding to the current output power of the genset;

The rotational speed of the genset is adjusted such that the rotational speed of the genset reaches a state that matches the standard rotational speed.

2. The method of claim 1 wherein said obtaining a minimum fuel consumption curve for the genset update comprises:

Obtain an initial minimum fuel consumption curve for the generator set;

Finding a speed corresponding to each of the power points on the initial minimum fuel consumption curve for each power point of the genset;

Taking the speed corresponding to each power point found as a starting point, increasing the speed of the generator set by the step length N, and decreasing the corresponding fuel consumption value after each change of the genset speed, respectively, by comparing each time Change the corresponding fuel consumption value after the genset speed to obtain the minimum fuel consumption value;

Recording the found power point, the minimum fuel consumption value obtained for each power point found, and the rotational speed corresponding to the lowest fuel consumption value obtained for each power point found, to obtain the Updated minimum fuel consumption curve.

3. The method of claim 2, wherein:

The initial minimum fuel consumption curve is a preset minimum fuel consumption curve or a minimum fuel consumption curve formed by a preset estimated value.

4. The method of claim 1 wherein adjusting the speed of the genset comprises:

Presetting the speed regulation interval of the generator set;

Detecting a current actual rotational speed of the genset;

If the actual speed of the group of the genset current power found by using the updated minimum fuel consumption curve is adjusted to a state matching the maximum speed in the speed regulation section; if the updated minimum fuel consumption curve is utilized The standard speed corresponding to the current power of the genset found is small The minimum speed in the speed regulation section of the preset genset adjusts the actual speed of the genset to a state that matches the minimum speed in the speed regulation section.

5. The method of claim 1 wherein adjusting the speed of the genset comprises the following:

Presetting the speed control threshold of the generator set;

Detecting the current actual rotational speed of the motor group;

If the absolute value of the difference between the standard speed corresponding to the current power of the genset and the current actual speed of the genset found by using the updated minimum fuel consumption curve is greater than the speed threshold, adjust the speed of the genset to The actual speed of the genset reaches a state that matches the standard speed corresponding to the current power of the genset; if the current temper corresponding to the current power of the genset is found using the updated minimum fuel consumption curve and the genset current If the absolute value of the difference between the actual rotational speeds is less than the speed control threshold, the current rotational speed of the genset is maintained.

A device for realizing the speed control of a generator set, comprising: an acquisition unit, a detection unit, a search unit, and a speed control unit; wherein

The obtaining unit is configured to obtain a minimum fuel consumption curve of the genset update;

The detecting unit is configured to detect a current output power of the genset;

The searching unit is configured to use the updated minimum fuel consumption curve to find a standard rotational speed corresponding to a current output power of the genset;

The device according to claim 6, wherein the obtaining unit comprises: a setting module, configured to set an initial minimum fuel consumption curve;

a query module, configured to find, on the initial minimum fuel consumption curve, a rotational speed corresponding to each power point for each power point of the genset;

The statistic module is configured to increase and/or decrease the rotational speed of the genset by the step N by using the speed corresponding to each power point found, and separately calculate the corresponding fuel consumption value after each change of the genset speed , by comparing the corresponding fuel consumption value after each change of the genset speed to obtain the minimum fuel consumption value;

a recording module, configured to record the found power point, the minimum fuel consumption value obtained for each power point found, and the minimum fuel consumption value obtained for each power point found The speed of rotation to get the updated minimum fuel consumption curve.

8. Apparatus according to claim 6 wherein:

The detecting unit is further configured to detect a current actual rotational speed of the genset;

The speed control unit includes:

a processing module, configured to set a speed adjustment interval or a speed control threshold of the generator set;

a comparison module, configured to respectively compare a standard rotation speed found by the search unit with a maximum value and a minimum value of the speed regulation interval or compare a difference between a standard rotation speed found by the search unit and an actual rotation speed of the genset An absolute value and a magnitude of the speed control threshold, and outputting a comparison result;

The adjustment module is configured to receive the comparison result output by the comparison module, and adjust the speed of the power generation unit according to the comparison result, so that the rotation speed of the power generation unit reaches a state matching the standard rotation speed corresponding to the found output power.

A system for controlling the speed of a generator set, comprising: a power sensor, a speed controller, and a speed sensor; wherein

The power sensor is configured to detect a current output power of the genset and send the detection result to the speed controller;

The speed sensor is configured to detect a current speed of the genset and send the detection result to the speed controller;

The speed controller is used for the method of controlling the speed of the genset according to any one of claims 1 to 6 and combining the current output power of the genset received and the current speed to achieve the rpm of the genset control.