What is electricity?
All matter in nature is composed of atoms, and each atom is composed of a positively charged nucleus and a certain number of negatively charged electrons, and the electrons revolve around the nucleus at high speed. Under normal circumstances, the positive charge of the nucleus band is equal to the negative charge of the electron band, so the general object is not charged. When the electrons leave the nucleus by external force, they run from one object to another, so that the object is charged. Objects that lose electrons are positively charged, and objects that gain electrons are negatively charged.
What is Current?
The movement of electrons in a conductor by an external force will form a current, and the direction of the current is opposite to the direction of the movement of the electrons. The unit of current is ampere A .
If the direction of the current does not change with time, it is called direct current; if the direction and magnitude of the current change periodically, it is called alternating current.
Direct current and alternating current can be converted to each other, the process of converting alternating current to direct current is called rectification, and the process of converting direct current to alternating current is called inversion.
What is Voltage?
Voltage is what drives the directional movement of free charges to form an electric current. Electric current can flow in a wire also because there is a difference between a high potential and a low potential in the current. This difference is called potential difference, also called voltage. Voltage is also divided into DC voltage and AC voltage.
In a three-phase four-wire system, the voltage is further divided into phase voltage and line voltage. Phase voltage refers to the voltage between phases A, B, C and N, and line voltage refers to the voltage between phases A, B, and C. In our daily life, the phase voltage is 220V and the line voltage is 380V. Line voltage = phase voltage x √3. At present, the voltage level often said in the industry refers to the line voltage.
What is Power?
Power refers to the amount of work done by an object in unit time, that is, power is a physical quantity that describes the speed of work.
Power is divided into apparent power S (kVA), active power P (kW), reactive power Q (kvar), apparent power is the sum of reactive power and active power, and the relationship between them is S²=P²+Q² .
Power = Voltage x Current. Taking 30kVAr Static Var Generator as an example, in the case of 400V rated voltage, the rated current is 45A. The specific calculation method is:
Firstly calculate the single-phase capacity=30x1000/3=10000var, and then divide by the phase voltage 400/√3 to get the current 43.3A .
Active Power and reactive power
Active power is the power required to ensure the normal operation of the equipment, that is, to convert electrical energy into other forms of energy, such as mechanical energy, light energy, thermal energy, etc.
Reactive power is relatively abstract, mainly used for the exchange of electric and magnetic fields in the circuit, and does not do external work. Reactive power is divided into inductive reactive power and capacitive reactive power.
The inductive reactive voltage leads the current, because the inductor current cannot change abruptly, and the inductor voltage will lead the current;
The capacitive reactive voltage lags the current, because the capacitor voltage cannot be abruptly changed, and the current through the capacitor voltage will lag.
SVG and leading or lagging current
Load current is detected through external CTs and fed to the internal DSP and CPU where an Instantaneous Reactive Power algorithm separates the active power from the reactive power. A compensating reactive power requirement is dynamically and accurately calculated and sent to the IGBT control where a PWM signal is generated at a switching frequency of 25.6kHz. A compensating capacitive reactive power or inductive reactive power is controlled by the manipulation of the DC bus voltage in comparison to the AC line voltage. Thus a capacitive current or inductive current will flow, creating a reactive power exchange with the network.
YTPQC Static Var Generator detects the phase angle difference and generates leading or lagging current into the grid, making the phase angle of current almost the same as that of voltage on the transformer side, which means fundamental power factor is unit. SVG can continuously adjust reactive power dynamically and bi-directionally (leading or lagging). There is no chance of system resonance and even under low voltage conditions SVG will provide full reactive power compensation. The YTPQC SVG is 100% inverter based so there are no AC capacitors to fail.
YTPQC-SVG Series
YTPQC-SVG support modules and panels,and SVG modules are divided into wall-mounted SVG, rack-mounted SVG and Free landing modules, which capacity covers from 10kVAr to 100kVAr (take 400V level product for example)
And capacity of SVG panels covers from 100kVAr to 500kVAr.
SN | Item |
Rated Capacity |
Factory Model |
Dimensions (W*D*H,MM) |
N.W. (KG) |
Packing Size (W*D*H,MM) |
G.W. (KG) |
1 | SVG | 10kVAr | YTPQC-SVG/10-4-4L-RW | 360*402*125 | 20 | 740*690*445 | 25 |
2 | SVG | 15kVAr | YTPQC-SVG/15-4-4L-RW | 360*402*125 | 20 | 740*690*445 | 25 |
3 | SVG | 30kVAr | YTPQC-SVG/30-4-4L-RW | 505*550*190 | 34 | 740*690*445 | 40 |
4 | SVG | 50kVAr | YTPQC-SVG/50-4-4L-RW | 505*550*190 | 35 | 740*690*445 | 41 |
5 | SVG | 75kVAr | YTPQC-SVG/75-4-4L-RW | 505*570*280 | 53 | 740*690*445 | 63 |
6 | SVG | 85kVAr | YTPQC-SVG/85-4-4L-RW | 505*570*280 | 54 | 740*690*445 | 64 |
7 | SVG | 100kVAr | YTPQC-SVG/100-4-4L-RW | 505*570*280 | 55 | 740*690*445 | 65 |
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