JPS5986427A - Power system simulator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a power system simulator 4, in particular, which inputs the power system connection state, city, power supply and demand situation, and calculates the system state such as power flow flowing through power system equipment. This invention relates to an electric power system simulator that creates quantities.

C. Technical background of the invention] Generally, when simulating a power system, a power system simulator shown in block form in FIG. 1 is used. In FIG. 1, a power system simulating device 1 includes a simulating section 2 and a setting section 3. The simulation section 2 includes a power system simulation section 4, a simulation operation command input section 5, and a simulation result output section 6, and the setting section 3 includes a power system state storage device 7, a power system state setting device 8, and a simulation start/system state. It consists of a memory 9. Then, an external operation signal 10 is input to the simulated operation command input section 5, and the system response simulated by the power system simulation section 4 in response to this command is outputted to the outside as an output signal 11 via the simulation result output section 6. do.

In starting the power system simulation described above, it is necessary to install a large amount of power in the initial power system configuration.

Therefore, normally, the actual state of the power system 12 is taken into the power system state storage device 7 via the transmission device 13, and this is stored in the simulation start/system state memory 9, and this is used as the initial value of the system state. The power system simulator 4 starts simulating the power system.

Further, the contents of the system status memory 9 can be partially changed using the setting signal 14 from the power system status setting device 8.

[Problems with background technology]

For the reasons described below, conventional equipment with the above configuration almost always has an imbalance in power supply and demand between the system state quantities at the start of the simulation, that is, the total power generation amount and the vertical load consumption and power transmission loss total. A discrepancy exists. The first reason is that telemeter devices are not often installed at all terminals in an actual power system, but are currently installed only at major terminals.

Therefore, there is a limit to the amount of data that the transmission device 13 can capture.
It is impossible to capture the entire power generation ridge or full width load in the system. The second reason is that in order to increase the training effect, some parts of the power system are connected to the actual power system.

This is because a portion of the state (%) is created by the power system state construction device t, 8. When simulation of a power system is started from such a state of power supply and demand imbalance111, immediately after the start, for example, the system frequency changes greatly, which causes a sudden change in the state quantity such as a change in the power generation (a number of outputs), and fl. !j station, the simulation results in a situation that is very different from the one that was set.

On the other hand, in an actual power system, there is no large power supply and demand imbalance unless there is an off-shore accident, and since the accident simulation is made to occur in the middle of the normal simulation, it is possible to simulate as much as possible after the simulation starts. It is desirable to eliminate the power supply and demand imbalance within a short period of time. In this respect, conventional devices can eliminate power supply and demand imbalances in the process of simulation, but they have the disadvantage of requiring a relatively long period of time to resolve.

[Purpose of the invention]

The present invention has been made for the purpose of reproducing the above-mentioned drawbacks, and aims to provide a power system simulating device in which the power system state quantity does not suddenly change immediately after the simulation starts.

[Summary of the invention]

In the present invention, in order to create an initial state that can be simulated so that the frost 1 power system state quantity does not suddenly change, a flat start data creation device is provided in the construction section, and the initial state quantity is created in advance by software and stored in the initial system state storage memory. By storing this information and inputting it to the power system simulator when starting the simulation, smooth system simulation can be achieved.

[Embodiments of the invention]

Examples will be described below with reference to the drawings. FIG. 2 is a block diagram of an embodiment of the power system simulator according to the present invention. Numbers 1 to 14 in the figure correspond to those in FIG.

Reference numeral 15 denotes a flat start data creation device, which stores the data created here in an initial system state storage memory 16 and inputs it to the power system simulator 4 at the start of simulation.

FIG. 3 is a flowchart of an embodiment in which the flat data creation device is realized by software of an electronic divider.

In addition, in the following explanation, the calculation method and calculation model for the system state of the power system PA pseudo-HA1 will be used as an example of power flow calculation and frequency fluctuation calculation that takes into account the generator governor effect, and a flat calculation corresponding to that calculation will be used. Startable state M
°I will only talk about the creation, but I will explain stability calculations and other performances,
Of course, it can be created in the same manner for other systems.

In FIG. 3, 5tep 31 is the missing data complementing process, which is the amount of power system state required for simulation that could not be captured in the power system state storage device 7, and the power system state setting device 0. 15 for those not set in '8.
It is complemented according to the rules of F. For example, call 1
Possible methods include estimating the power factor from the reactive illll total effective power of a 1 ton machine. Of course, other methods may also be used. 5tep 32 initializes the transmission loss, but since the power transmission loss necessary for calculating the power supply and demand imbalance is unknown until the power flow calculation is performed, O is given as the initial value, for example. 3tep 33 is electricity supply and demand imbalance ΔP
It is calculated by Δp - (sum of power generation amount) - (sum of load consumption knowledge) - (power transmission loss).

5tep 34 is F? fl jtd 5tep 33
This is the process of determining whether ΔP has become data that allows a flat start, and in this embodiment, the target is tidal current calculation and frequency fluctuation calculation. Do the following. If 3te
If ΔP is sufficiently small at p 34, a flat start is possible and the process ends. Also, if ΔP is not sufficiently small at 3tep 34, the process moves to 5tep 35, and ΔP is not small enough.
The system frequency is calculated based on P and the characteristics of the generator and load. That is, in general, a solution to the frequency/sway equation of the system is found. In step 36, the power generated by the generator is corrected so as to eliminate the deviation (hereinafter referred to as Δf) between the system frequency and the reference frequency. For example, there are various methods such as using the integral value of Δf as the increment of the generated power, and any method may be used. 3
In step 37, the power flow in the power transmission line is analyzed to simulate power transmission loss. After that, return to 5tep 33 and 5top each below υ
This is repeated until the absolute value of ΔP becomes sufficiently small.

FIG. 4 is a power system diagram, and the operation of the present device rt shown in FIG. 3 will be explained using a case where the system simulation result is a simple system as shown in FIG. 4 as an example. First, in Figure 4, 4
1a, 41b, 41c are generators, 42a, 4
2b, 42cti step-up transformer, 43a to 43e
Reference numerals denote power transmission lines, 448 to 44d are loads, and 45a to 45f are main wires, which are constructed as shown in the figure. For the sake of simplicity, from now on, we will focus only on the active power component and exclude the voltage and reactive power components, but even if these are considered, the flat start same song data will be created in almost the same way. It goes without saying that it can be done.

Now, when the simulation starts, the contents of the system status memory are about the generator generated power, 41a is 100MW, 41b is 100MW
, 41c is 60 MW, load power consumption is 44d
is 40MW, 44a is 100MW, 44b is 80M
Assume that W, 44c is 80 MW. That is, the emission tI
I! : It is assumed that there is a shortage of unloaded boxes due to the data failure of the machine 41e or a setting change by the power system status setting device 8.

In this case, since the initial values of transport and loss at 3tep 32 in Figure 3 are set to O, the power supply and demand imbalance at 3tep 33 is ΔP=100+100-1-60-(40+100-1
-80+80)-0=-40MW, that is, there is a power generation shortage of 40 MW.

Therefore, 5tep Since ΔP is a dog at 34, 5tep
The system frequency is calculated in p.35, but the amount of power generated is significantly insufficient for the load, resulting in a decrease in frequency, so 5t
In ep 36, lightning strikes, the power generated by the aircraft increases, and the power consumption of the load decreases depending on the load characteristics (the power consumption of the load is higher as the frequency decreases, and less as the frequency decreases). ) As a result, the power generated by the generator is 41a or 130MW.

41b is 130 MW, 41 e is 80 MW, load power consumption is 44 d is 35 MW, 44 a is 95 MW, 44
Assume that b has become 75 MW and 44c has become 75 MW.

Under the above conditions, transmission loss is calculated at 5tep 37, and if it is, for example, 5 MW, under these conditions, 5tep 37 is calculated.
At p 33, power supply and demand is unbalanced, ΔP=1
30+1.30+8O-(35+95+75+75)-
5 = 55 MW, and the power becomes Hahahata J.

As this operation is repeated, the power supply and demand state shown in FIG. 5 is reached.

In Figure 5, 41a is 120 MW, 4 l
b is 120 MW, 41 c is 70 MW, and the load power consumption is 44 d- is 40 MW, and 44 a is 100 MW.
W, 44b is 80MW, 44c is 80MW, power transmission loss I
Since OMW, ΔP=120+120+7O-(40+100+80+
80)-10=0, and the main process ends at step 34.

The thread axis and state obtained in this way are data without power supply and demand imbalance, including the loss of 1F of feed, and if a power system simulation is performed using this state as an initial value, a flat start can be achieved.

Further, since the above calculation can be performed independently of the simulation process, it can be performed in an extremely short time.

In addition, the initial power system state storage memory 16) is a memory that stores the flat possible data created in this way, and it is used to select the data from this 1b; You can start simulating.

FIG. 6 shows another embodiment of the 11 systems + 9 disguised 7Ls according to the present invention. Reference numerals 1 to 16 in the figure correspond to those in FIG. Reference numeral 17 denotes an input/output unit, which stores the data created by the flat start data creation device 15 in the external memory 18 via the input/output device 17i, and selects and inputs data of an appropriate type before starting the simulation. Various patterns 'f: are to be simulated. The rest of the configuration in M is the same as that in FIG.

〔Effect of the invention〕

As explained above, according to the present invention, the power system simulator includes a flat start data creation device and its creation data f1.
It has an initial system state storage memory that can store several cases of collars, and has data that can be used for a flat start! t'
Since the power system simulator is configured to hold the IA-L, it is possible to provide an electric power system simulator that can perform a flat start immediately after the simulation starts.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional power system simulator, FIG. 2 is a block diagram of an embodiment of the power system simulator according to the present invention, and FIG. 3 is a flowchart of a flat start data creation device realized by software. 4 and 5 are power system configuration diagrams for explaining the operation, and FIG. 6 is a block diagram of another embodiment of the frost and power system frame simulating device according to the present invention. l...' Turtle power system simulation equipment j@2... Simulation part 3...
Setting section 4...Power system simulation section 5...Simulation operation command input section 6...Polar simulation output section 7...1
b7 Power system state storage device 8...Power system state setting device 9...Simulation start/system state memory 10...Operation signal 11...Output signal 12...7b; Power system 13...Transmission Device it, 1s...
・Flat start data creation device 16... Initial system state storage memory 17... Input/output device 18... External memory Patent applicant Tokyo Shibaura Electric Co., Ltd. Agent Norio Doishi Figure 1 142 Figure 3

Claims (2)

[Claims] (1) Check the connection status of the power system and the power supply and demand situation. The electric power is configured to be input to a power system state storage device and output to a power system simulating unit that simulates a power system state width via a system state memory that is connected to the power system state storage device and the power system state setting device. In the system simulator, a flat start data creation device and a subsequent initial system state storage memory are interposed between the system state memory and the power system simulator, and the flat start data creation device records the system state at the time of starting the simulation. 1. A power system simulator characterized in that calculation processing is performed in advance so as to eliminate power supply and demand imbalance caused by insufficient data of 1, power generation power, power consumption, and power transmission loss. (2) The power system simulator according to claim 1, wherein the initial system state storage memory is connected to an external memory via an input/output device.