CN201207581Y

CN201207581Y - Photovoltaic DC system for transforming plant

Info

Publication number: CN201207581Y
Application number: CNU2008200357502U
Authority: CN
Inventors: 张俊生; 杜贵和; 田宇; 林航; 陈晓明
Original assignee: ANHUI JIYUAN POWER SYSTEM TECHNOLOGY Co Ltd
Current assignee: ANHUI JIYUAN POWER SYSTEM TECHNOLOGY Co Ltd
Priority date: 2008-04-30
Filing date: 2008-04-30
Publication date: 2009-03-11
Anticipated expiration: 2018-04-30

Abstract

Disclosed is a transformer substation photovoltaic direct current system, which is characterized in that: a direct current load taking a storage battery set as a standby charging and discharging power supply is provided with a charger power supply loop and a photovoltaic power supply loop in parallel arrangement and alternating access; and a photovoltaic controller PVC is arranged, the power supply loop state controlled by the photovoltaic controller PVC through a relay K is: when the voltage of the storage battery set CB reaches the set value A, the charger power supply loop is disconnected, and the photovoltaic power supply loop is accessed; and when the voltage of the storage battery set CB is lower than the set value B, the charger power supply loop is accessed, and the photovoltaic power supply loop is disconnected. The utility model realizes the invention purpose of energy saving, consumption reduction, environmental protection and improving the running reliability of the transformer substation direct current system by applying solar energy to the transformer substation direct current power supply system.

Description

Photovoltaic DC system of transformer station

Technical field

The utility model relates to solar photovoltaic generation system, relates in particular to a kind of photovoltaic DC system that is applied in the transformer station.

Background technology

The energy is the important substance basis that the national economic development and living standards of the people improve, but the environmental problem that the finiteness of fossil energy and development and use bring is seriously restricting sustainable development economic and society.This just promotes people to seek available new forms of energy.Make full use of the coordinated development that solar energy helps keeping getting along amiably and peacefully of man and nature and energy and environment.

Transformer station is the flow direction of voltage of transformation in the electric power system, acceptance and distribution electric energy, control electric power and the electric power facility of adjusting voltage, and it gets up by the grid contact of its transformer with each step voltage.In transformer station, direct current system also provides reliable operating power for operation for control signal, relaying protection, automatics and emergency lighting etc. provide reliable DC power supply.Direct current system reliably whether, to the important role in safe operation of transformer station, be the assurance of substation safety operation.For a long time, the direct current system in the transformer station is to rely on the station with the power supply power supply, and this form there are the following problems:

Though 1 is equipped with batteries as stand-by power supply in transformer station, but, when using the power supply long period to have a power failure, because direct current system relies on the batteries power supply in this long period always at the station, it is dark that this makes batteries discharge, thereby cause the direct current system can't operate as normal.

2, standing and derive from power plant power supply with power supply, is being in the thermal power plant of fuel with coal, because of the power supply of station with power supply needs, has increased the fuel consumption of generating, also more brings pollutions such as dust, carbon dioxide, sulfur dioxide because of generating simultaneously.

3, electric energy is in electrical network medium and long distance transmission, and energy loss is inevitable, and is same, stands to be the electricity consumption of himself on the one hand with the energy consumption of power supply, is its long-distance transmissions on the other hand.

Summary of the invention

The utility model is for avoiding above-mentioned existing in prior technology weak point; photovoltaic DC system of a kind of transformer station is provided; by with Application of Solar Energy in the transforming plant DC electric power system; to realize saving energy and reduce the cost, protecting environment, improve the goal of the invention of transformer station direct current system reliability of operation simultaneously.

The utility model technical solution problem adopts following technical scheme:

The design feature of photovoltaic DC system of the utility model transformer station is:

With batteries is that the standby dc load that discharges and recharges power supply has charger current supply circuit and the photovoltaic power supply loop that is arranged in parallel, alternately inserts;

Photovoltaic controller PVC is set, and the current supply circuit state of being controlled by relay K by described photovoltaic controller PVC is: when the voltage of batteries CB reached set point A, the charger current supply circuit disconnected, and the photovoltaic power supply loop is inserted; When the voltage of batteries CB was lower than set point B, the charger current supply circuit inserted, and the photovoltaic power supply loop disconnects.

Design feature of the present utility model also is:

Described set point A is set greater than set point B.

Series connection is provided with counnter attack and fills diode in the output loop of charger.

In the output loop of relay, be arranged in parallel the manual bypass switch.

Compared with the prior art, the beneficial effects of the utility model are embodied in:

1, the utility model is that the version that transformer station direct current system is powered does not consume fuel with the solar power generation, does not produce pollution.

2, the utility model solar power generation uses in the station, and electric energy transmitting is apart from weak point, and line loss is low, the utilance height.

3, the utility model is with photovoltaic power supply loop and the alternation of charger current supply circuit, and serves as preferred with the photovoltaic power supply loop, makes solar power generation obtain maximum utilization on the one hand, the reliability of the power supply of assurance system on the other hand.

4, the utility model set point A is set to greater than set point B, and charger is realized return difference control, has avoided the charger frequent start-stop.

Description of drawings

Fig. 1 constitutes schematic diagram for the utility model system.

Number in the figure: diode, KM A.C. contactor, Q2 by-pass switch, K relay, PVC photovoltaic controller, PV solar module, DCC dc load are filled in CB batteries, Q1 charge switch, AUF step-down module, CH charger, V counnter attack.

Below by embodiment, the utility model is described in further detail in conjunction with the accompanying drawings:

Embodiment

Referring to Fig. 1, by solar cell utilization " photovoltage " effect solar energy converting is become electric energy, for obtaining to meet the voltage signal of transformer station direct current system requirement, each solar cell connects and composes solar module PV by the series-parallel system of setting, the output signal of solar module PV inserts direct current system by photovoltaic controller PVC voltage stabilizing output and closes on the mother, be batteries CB charging, give dc load DCC power supply simultaneously.Control switch Q1 is used to control batteries CB charging.The setting of step-down modules A UF is in order to adjust to the needed DC 220V of dc load with closing female voltage in the direct current system.

Relative set in concrete the enforcement also comprises:

In the output loop of relay K, be arranged in parallel manual bypass switch Q2,, can manually cater to by-pass switch Q2, connect bypass, make charger CH work when photovoltaic controller PVC breaks down can not realize automaticallying switch the time.This design make system photovoltaic controller PVC and charger CH can realize automaticallying switch, possess the manual bypass function simultaneously, strengthened fail safe, the reliability of direct current system power supply.

In order to prevent the photovoltaic loop oppositely to the charger power supply, diode V is filled in the adjunction counnter attack on charger CH output loop.

System operating mode:

When accumulator battery voltage is lower than set point B, send the ac input end A.C. contactor KM that control signal is given charger CH by photovoltaic controller PVC by relay K, control A.C. contactor KM adhesive, and then control charger CH start, system switches to by charger CH and powers to direct current system;

In case detecting accumulator battery voltage, photovoltaic controller PVC is higher than set point A, then send control signal by relay K to the ac input end A.C. contactor KM of charger CH automatically, control A.C. contactor KM disconnects, and then control charger CH shutdown, system switches back to by photo-voltaic power supply again and powers.So circulation, photovoltaic controller and charger automatically switch, alternation.

System utilizes return difference control technology set point B to be set to be lower than set point A, can effectively avoid because the charger frequent start-stop phenomenon that causes of system voltage normal variation guarantees the stable operation of system, prolongs charger useful life.

For realizing the system remote communication, corresponding setting also comprises:

System configuration RS485/232 communication serial ports inserts comprehensive automation system of transformer substation by certain stipulations conversion, and transformer station's photovoltaic DC system operational parameters and state information teletransmission are arrived monitor terminal.Transformer station's photovoltaic DC running situation can realize telemonitoring, comprises the switching state of supervision photovoltaic loop output current, accumulator battery voltage, battery charging electric current, accumulative total electric weight and photovoltaic controller and charger etc.

Claims

1, transformer station's photovoltaic DC system is characterized in that:

For having, the standby dc load (DCC) that discharges and recharges power supply is arranged in parallel, replaces charger current supply circuit and the photovoltaic power supply loop inserted with batteries (CB);

Photovoltaic controller (PVC) is set, and the current supply circuit state of being controlled by relay (K) by described photovoltaic controller (PVC) is: when the voltage of batteries (CB) reached set point A, the charger current supply circuit disconnected, and the photovoltaic power supply loop is inserted; When the voltage of batteries (CB) was lower than set point B, the charger current supply circuit inserted, and the photovoltaic power supply loop disconnects.

2, photovoltaic DC system of transformer station according to claim 1 is characterized in that being provided with described set point A greater than set point B.

3, photovoltaic DC system of transformer station according to claim 1 is characterized in that in the output loop of charger (CH) series connection is provided with counnter attack and fills diode (V).

4, photovoltaic DC system of transformer station according to claim 1 is characterized in that being arranged in parallel manual bypass switch (Q2) in the output loop of described relay (K).