JPS59213235A - Power source - 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 (A) Industrial Application Field The present invention relates to a pulse width modulation inverter system using a solar cell as a power source and a power supply device using parallel operation for supplying power to a load by operating the entire commercial power system in parallel. This relates to a control circuit that extracts the maximum power from the Mtl power source.

(b) Prior art In general, the thickness applied to private residences, etc.
In private power generation facilities such as ponds, storage ponds are used to store electricity in order to make effective use of solar energy. Falsely, the power generated by the solar cell @' was stored in the i3i, l storage battery (2) the lightning power generated by the solar cell etc. was stored in the storage battery (C
4λ'l'
IfR is connected to the power line system, 3 out of 3 shots are made by Tai VA Raiike etc.
Chapter 11 to the power warehouse (Regenerative L-C said lightning in the power system for the pole?
Don't try to do 7'J with T1' exertion.

1. Kaji, the former storage pond? When using ii.
.

Maintenance of batteries is time consuming and there is also the problem of power loss when the storage battery is struck by lightning. Permission for implementation? There are many legal gates and αs at the time of birth and career, and Isugen is also lacking in terms of requirements.

Therefore, an inverter system consisting of an inverter that converts the DC power generated by the power generation equipment and the lightning generation equipment into direct current, electric power, and the commercial FLRL light power.

and? The inverter system is connected to the outside of the panel to form a so-called parallel power system, and both systems are operated so that the power supplied to the inverter system does not exceed the total demand gravity of the load. Electric power is supplied to the load to prevent so-called cross current, in which power from the inverter system is regenerated into the commercial power system, from occurring.

At this time, the output characteristics of the solar cells that serve as the power source for the inverter system are generally shown by the curves in Figure 1, and the inverter system can be operated efficiently by making maximum use of the power generated by the solar cells. In order to do this, it is sufficient to operate the sun-1 pond at the optimal operating point Pmax on the curve in the same figure, and at the optimal operating point ga U, extract the maximum power from = i-1 sun I. be able to.

However, the output characteristics of the solar cell vary depending on the amount of solar radiation, and λ- changes as shown by curves B, C, and D in Figure 2, and the optimal operating point also changes to point PIIP2+P3.
1st article: What is the output characteristic of the monitor solar cell when the solar radiation conditions are different in advance when a monitor solar cell is used and the Ifl operating point has to be tracked? The parameters for deriving the optimum operating point under each solar radiation condition are stored in a microcomputer or the like, and the inverter system is operated based on the 8e parameters before the desired solar radiation condition when the power supply device is operated. Although,
In reality, due to changes in ambient temperature, aging, degree of surface contamination of the solar cell, etc., there will be a discrepancy between the output characteristics determined by the monitor solar cell and the output characteristics of the solar cell of the power supply device. However, there is a drawback that it is not possible to appropriately track the optimum operating point according to the solar radiation conditions.

Its purpose is to provide a control system that allows the inverter to always operate at its optimum operating point, regardless of the output characteristics of the solar cells, etc.

B) Structure of the Invention In order to keep the reactive power supplied to the inverter system from a pulse width modulation inverter system using a solar cell or the like as a power source and a commercial power system constant, the inverter advances or advances the reactive power of the power system. In addition to supplying phase-delayed reactive power, e) controlling the inverter so that the active power supplied to the commercial power system is always maximized, and extracting maximum power from the power source. By changing the amplitude and phase of the inverter output voltage with respect to the voltage of the entire commercial power system, it is possible to control the reactive power and the effective voltage between the inverter system and the commercial power system.

Lvt9! Example of Leprosy: When two systems of power supplies are operated in parallel, the frequency, phase, and voltage of each system's power supply are adjusted, and the power is distributed appropriately to the load. Kf must be present to prevent the occurrence of a circulating flow (also called circulation flow). For this reason, automatic voltage type/inverter is generally used.
It is generally known how to control the reactive and active power delivered to a load by adjusting the amplitude and phase of its output voltage.

Figure 6 shows a system 1'')4 for controlling reactive power and active power by a self-help voltage type inverter.
Reactor for interconnection, (3) Commercial power system, 141td
It's a load. iftθ is the output frost Fl= of the inverter (1).

The output current is the same for 1st work, and the front distribution accelerator for Z work I'i (2
) is the glue actance. (Actor (2)
) will be ignored. ) The power source impedance of the commercial power system is 9. If it is controlled and is a very low value and is so small that it can be ignored, the output of the inverter (1) will cause a problem in the Z-type circuit. Therefore, iI is the voltage difference between e and θC and the impedance z of the inverter system steering wheel (2)
Decide uniquely by

Fig. 4 (A+ and (Bl are Fjti inverters (1)
The output voltage e and the voltage θ of the commercial power system (3). This is a vector diagram showing the reactive current that connects from the inverter (1) to the couplet (4) when the amplitude is made to match and the amplitude is changed. e. is used as the reference vector.

As shown in No. 41 fjl (A), inverter output power e■
The amplitude of the commercial power system voltage e. , l: When the lion ignites, the inverter (1) stops supplying delayed phase reactive power from the inverter (1) to the commercial power grid (3). On the other hand, as shown in Fig. 4 (B+), if the amplitude of the inverter output voltage e is made smaller than the commercial power system voltage θ, the phase advance from the inverter (1) to the commercial power system (3) is disabled. Electricity is supplied.

FIG. 5 (Δ) and (B) show the inverter output heavy pressure ei, the commercial power 'iJ'; and the power system voltage e. Let's omit the change in the phase difference θ, and let it be eC−eICosθ...■ If the inverter (1) and the power system are
The effective power flowing to 11j is obtained.

Hereinafter, by varying the width and phase of the inverter output voltage with respect to the power system pressure, the reactive power and quasi-effective power between the inverter and the commercial power system can be reduced. I can control the meeting.

The present invention will be explained more specifically based on the power supply system shown in Figure 6 below.
7<JK Explain.

A self-excited inverter (1) and a grid interconnection inverter (2).
vector, and (3) the commercial power system, and (4) f! 1
It is the same as shown in the third part of the 4 IjV'h13tl output.

(5) is a solar power source used as a power source for private power generation.
, Kaku iTQ Hinobark (1) K contact Vf: Keir1. (6) Ke^1 ■ Pulse width modulation ζf by the inverter (], )? , the first system of Uha Pressure, tji, i
This is a filter circuit consisting of a choke coil (L) and a capacitor (C2) that separates the fg wave.゛It is easy to increase the pressure. (81 is lri'
l1jl-,,', An analog switch that controls the power supply of the inverter system to the negative load 4);
is the output whistle from the front 3-hour inverter (1); the transducer α converts the effective aerodynamic force into DC voltage; uni is the transformer that converts the reactive power output from the flexible power system (31) into DC voltage; It is a deuser β.

Jul is an arithmetic processing unit, 1121 is a voltage control device, (j
31 is a phase control device, and 114t is a switching waveform generator +tJ. The arithmetic processing device (11) includes the voltage control device (12), the phase control device t131, and the switching waveform generator 04). Inverter output through I
+: Since the amplitude and phase of eT and the commercial power system voltage θ match, impark (1) is created. Inverter output voltage θ1 and curved power system voltage θ. When the amplitude and phase of
A signal is output from the drive unit @051 to the drive 9R1.
By 15+, the song a analog switch (ε3) is closed. Therefore, at this time, the inverter (1)/+.
Both the reactive power and the active power are l:'; the force difference cannot be obtained.

Next, the arithmetic processing unit (11) receives a signal from the transte user β00) and preliminarily receives the signal from the arithmetic processing unit fTtll.
I (〆・) set in the memory in l and the inverter (
1) to output σ,! 1.6 bonito effect '11j force 1 (α is the same, the above-mentioned revolving pressure 11Tl,' (ill device n fertilizer) and the switching waveform generator adjust the amplitude of the inverter output power voltage θ■ .

The arithmetic processing unit 1j1) receives the first sign of the transformer α (9), and outputs the output from the inverter (1).
131 and O switching wave 1F generator l1l)r,
Inverter output via r? 4.Adjust the phase of pressure e■ and 5 power system voltage ec.

At the same time, the arithmetic processing unit 1ull receives the signal from the invalid transducer f++11, and the reactive power output from the commercial power system (3) is transferred to the processing unit (11).
) is set in the memory of ζf.
l(4)Ik'riuu.

By carrying out such control 2, it is possible to keep the reactive power output from the power system (3) at a minimum, and suppress the voltage variation of the 15g commercial power system (3), making it possible to Since the effective tF force outputted from the inverter (1) can always be maximized, the solar gravity (5), which is easily affected by solar radiation and disease Ig-changes, can be (F: Capable of producing maximum power every month.

The above-described power supply system can also be applied to a system in which a fuel cell that uses chemical reaction energy is used as a power supply.

(F) Effects of the Invention As explained above, the present invention is connected in parallel with a pulse width modulation inverter system and a power system based on the above-mentioned electric power system. In order to minimize the reactive power generated by the inverter, the front d pin inverter supplies reactive power that is either advanced or delayed in phase with respect to the reactive power of the commercial power system, and the active power output from the front inverter is always maximized. The inverter? It is characterized by controlling and extracting the maximum harm from the source.Self-excited lightning I: The F-type inverter's reactive power and electric power adjustment functions allow it to be output from the commercial power system. Invalid gravity? By keeping the effective power 1 output from the inverter at the maximum value, it is possible to suppress voltage fluctuations in the commercial power system, and it is possible to always keep the power output from the It becomes something that can be used to extract electricity.

[Brief explanation of the drawing]

Figure 1 is an output characteristic diagram of a large battery with a high durability of 71 years. A vector diagram showing the basic system control for controlling the reactive power and reactive force of the commercial power system, non-41 fog (Al and CB+ is the reactive power system), Figure 5 (Al and (B) is a vector diagram showing the production of effective force, and Fig. 6 is a stem diagram showing the first embodiment of the present invention. (5)...Solar Thunder Pond, (1)... Inverter, (3)
...Commercial power system. Figure 1 Figure 2 Figure 3 Figure 4 "+8" Figure 5 IA+(B)

Claims (1)

[Claims] (1) A pulse width modulation inverter system using a solar cell or the like as a power source and a commercial power system are connected in parallel, and the reactive power of the commercial power system is controlled by the inverter in order to keep the reactive power output from the commercial power system constant. It is characterized by supplying reactive power that is phase advanced or delayed with respect to the inverter, and controlling the inverter so that the active power outputted from the inverter is always maximized, and extracting the maximum power from the front power source. power supply.