水利水电作业

Below we need to know how to do the daily power accumulation curve. First of all, let's literally understand the accumulation curve of next day's power. What is daily electricity? Remember? The amount of electricity needed per day, or the amount of electricity generated in a day. What does accumulation mean? I know. The daily power accumulation curve of IV is very important, which is the basis of the selection of installed capacity. In the later, we should use the daily power accumulation curve to determine the maximum working capacity, so we should learn to make the daily power accumulation curve. This cumulative curve is required to be done. Let's see, the coordinate box behind is the area where the daily power accumulation curve is to be made. His vertical coordinates are consistent with the vertical coordinates of the daily load graph, and the transverse coordinates have changed into accumulated electricity E. The transverse coordinates of the daily load diagram are time, and the transverse coordinates of the daily electric energy accumulation curve are the electric quantity. If there is an output force, there is a corresponding electric energy corresponding to it. We express the corresponding relationship between the output force and the electric energy by a curve, which (or this corresponding relationship) is called the daily energy accumulation curve (the daily load analysis curve). It is the change line of accumulated electric energy with output. How to draw the curve of solar energy accumulation? With the change of output, how does the accumulated electricity become? How much will the output increase by "1"? Let's take a look at the steps of drawing the daily power accumulation curve: we know that below the horizontal line of the daily minimum load is the base load area, and the output force of the base load area is uniform. So let's think about what kind of line the daily energy accumulation curve in the base load area (below the daily minimum load horizontal line) should be. = a straight line, right? Because it is the integral of the constant, the integral of the constant is a straight line. We know that a straight line can be determined by two points. Therefore, it makes no sense to pick up some more in the middle. So the origin point, the daily minimum load horizontal line one-point. In this way, the straight line can be determined by two points. The coincidence above the daily minimum load level is variable, so from here on, the shorter and more you draw, the more accurate the curve. Let's see, we divide these output segments. On this graph, I divide the vertical coordinates of the 8 load graph into four output segments: N1, N2, N3. . There is no need to divide below N1, and a few more paragraphs can be drawn up. The more segments you divide, the more ideas you have, the more accurate the curve will be made! As an example, make him simple and make less effort.

Step 1: divide the longitudinal coordinates into each output section according to the different conditions of the load, each output section has the corresponding electric energy. Think about it, there is a power station with N1 as much output at the bottom of the work, how much electricity should I send out a day of work? In order to meet the requirements of electricity users? It's so much energy from E1! There is also a power station that works as much as N2 in this pink area. How much electricity should I send out a day to meet the requirements of electricity users? It's so much energy from E2! There is also a power station, N3 so much output in this yellow area, work a day I should send out how much electricity, in order to meet the requirements of electricity users? It's so much energy from E3! Similarly, there is a power station with N4 as much output in the top part of the work, work a day I should send out how much electricity, in order to meet the requirements of electricity users? It's as much energy as E4! Step 2: all I have to do now is find out the relationship between output and accumulated electricity. Let's see, when the vertical coordinate is N1, what is the transverse coordinate? E1! So we found out a little bit. Now I take the vertical coordinates of N I +N 2, then the transverse coordinates should be E 1 +E 2, and now find out a little bit. When the longitudinal coordinate is N 1 +N 2 +N 3, the transverse coordinate should be E 1 +E 2 +E 3, another point. Similarly, when the longitudinal coordinates are the highest point of the daily load map, the transverse coordinates should be the sum of the four areas. E1 +E2 +E3 +E4. The area surrounded under the daily load curve represents the electricity required throughout the day. Step 3: look, I made four contribution segments, so there are four points. If the output section gets a little shorter and more ideas, the more accurate the line will be. Now let's connect these points into lines. This is the minimum daily load horizontal line, it is a straight line below! From here to the top is a curve, then this line is called a daily electric energy system product curve.

Features: let's take a look at the characteristics of this daily energy accumulation curve: the gabcd on this diagram is equivalent to the daily power accumulation curve we have just made. First of all, this red dot in the middle is the lowest point on the daily load map. This red line is the daily minimum load horizontal line. Under the daily minimum load N', the load does not change, so the gcK section is a straight line. Above N', the load varies with time. Therefore, the cd segment is a curve, and the more up, with the increase of load, the increase of electricity gradually decreases, so the cd segment is a concave curve, which is understandable. In terms of area, the missing block means that the area is reduced, and it is not a straight line increase, but a little smaller than a straight line, so it is a concave curve. All the way to the d point, so that the cumulative value of the d point, that is, the horizontal coordinate value of the d point, is the amount of electricity day and night. Let's look at it again, if the extension line along gc intersects the vertical line of the daily energy value with the e point, then what does the output value of the e point represent? =: is it the average daily output value? Because of what? Because the horizontal coordinate value of e point and d point is the same, it is the whole day of E, is the power generation of this day and night. The transverse coordinate value of e point is the daily power generation or daily electric energy. What is the characteristic value corresponding to the daily electricity energy we talked about earlier? Average daily output N, right? Recall the definition of average daily output. The longitudinal coordinate value of a point is the daily average output N, that is to say, the output value and the length of the line segment surrounded by the coordinate axis E is the area surrounded by the daily load curve and the longitudinal and transverse axis.

Note: A. When the daily electric energy accumulation curve is drawn, we need to accumulate from down to top. (Hydraulic system) The course design at the end of this semester will require a daily load map and a daily electric energy accumulation curve. Don't make a curve when you're making a daily load chart, and you'll make a step line so that when you're asking for area, it's a grid of rice paper. B. When you do this daily electric energy accumulation curve, it must be noted that it must be concave and cannot be scratched. And it is as steep as it is. The more we draw from the bottom, the shorter the power generation will be. C. It is possible to extend the gc section when the average load is requested. This is the practice and characteristic of the daily electric energy accumulation curve. In the book, P111, Example 5-1, went down to see it.

Example: let's take a look at this problem, it is a simplified daily load map, we take a grass paper to draw the power accumulation curve of this daily load map. I just told you how to do this. This must be done, because we will use this line later. That's all for this section. These data (30, 40, 50) are equivalent to the vertical coordinates of the line. (10 minutes) several coordinate points need to be divided into force segments, and the area below the daily load curve will be segmented from bottom to top to get E1, E2, E3, E4. The cumulative value of piecewise electric energy E is determined from which the corresponding a point and b point are determined and gradually accumulated to the highest point of the load according to this. The line gabcd of each intersection point is both the daily electric energy accumulation curve. Let's take a look at this problem, which is very simple. 6 hours is a time period; first look below 300000 kilowatts, just divide it into one period! What are the transverse coordinates of 300000 kilowatts of output? 30*24h=720kw h; what is the cumulative electricity when the longitudinal coordinates are 400000 kilowatts? 720 10 * L2 h = 840kw ·h; when the vertical coordinates are 500000 kilowatts? You need to add the top piece, 840, 10, 6, h, 900 kw. H; so the three coordinate points are (720, 30) (840, 40) (900, 50). It is very simple to connect a straight line below 300000 kilowatts with a curve above. Some students who have done wrong, some are accumulated from left to right, which is wrong! Our daily energy accumulation curve is tiring from bottom to top. Even if tired from left to right to the end is 900, but the middle is not the same.