Method and system for testing high-voltage ride-through of photovoltaic inverter

1 . A method for testing high-voltage ride-through of a photovoltaic inverter, comprising:

connecting a board-to-board (BTB) circuit to a passive circuit in series, and connecting circuit breakers to the passive circuit to form an inverter test device;

connecting one end of the inverter test device to an alternating current power supply, and connecting the other end of the inverter test device to a tested apparatus; and

performing testing by adjusting a parameter of the passive circuit and a switching mode of the circuit breakers by means of the BTB circuit.

2 . The method for testing high-voltage ride-through of a photovoltaic inverter according to claim 1 , wherein the passive circuit comprises a current limiting reactor, a short-circuit capacitor and a resistor with a fixed parameter; and

overshooting at voltage recovery is suppressed by means of the resistor with a fixed parameter.

3 . The method for testing high-voltage ride-through of a photovoltaic inverter according to claim 1 , wherein

the BTB circuit uses a topology structure of alternating current-direct current-alternating current, one side of the BTB circuit is connected to the passive circuit, and the other side of the BTB circuit is connected to the alternating current power supply; and

the side connected to the passive circuit uses a constant voltage control strategy, and the side connected to the alternating current power supply uses a constant power factor control strategy.

4 . The method for testing high-voltage ride-through of a photovoltaic inverter according to claim 2 , wherein

the circuit breakers comprise a bypass-circuit breaker S 1 and a short-circuit breaker S 2 ;

before a test, the bypass-circuit breaker S 1 remains closed, and the short-circuit breaker S 2 remains open;

at the beginning of the test, the bypass-circuit breaker S 1 is opened, the current limiting reactor that is connected to the BTB circuit in series is put into operation, and the short-circuit breaker S 2 is closed to simulate transient high voltage generated by a fault of a power grid; and

the short-circuit breaker S 2 is opened, the bypass-circuit breaker S 1 is closed after an interval of time T, and the test ends.

5 . The method for testing high-voltage ride-through of a photovoltaic inverter according to claim 4 , wherein the adjusting a parameter of the passive circuit comprises:

a high voltage amplitude K satisfies the following equation:

K

=

R

2

+

(

1

ω

⁢

C

)

2

R

2

+

(

ω

⁢

L

-

1

ω

⁢

C

)

2

wherein R is a resistance value of the resistor with a fixed parameter, C is a capacitance value of the short-circuit capacitor, L is an inductance value of the current limiting reactor, and ω is an angular velocity.

6 . The method for testing high-voltage ride-through of a photovoltaic inverter according to claim 4 , comprising:

the bypass-circuit breaker S 1 is connected to the current limiting reactor in parallel, and the short-circuit breaker S 2 is connected to the short-circuit capacitor in series.

7 . The method for testing high-voltage ride-through of a photovoltaic inverter according to claim 6 , wherein

the BTB circuit runs in two ways of a voltage source and a current source.

8 . A system for testing high-voltage ride-through of a photovoltaic inverter, comprising:

a passive circuit configured to simulate transient high voltage;

circuit breakers comprising a bypass-circuit breaker S 1 and a short-circuit breaker S 2 which are respectively configured to control whether inductance of an inverter test device is put into operation and simulate transient high voltage generated when a real fault occurs in a power grid; and

a board-to-board (BTB) circuit connected to the passive circuit in series and configured to adjust a parameter of the passive circuit and a switching mode of the circuit breakers, so as to eliminate an influence of the inverter test device on power supply voltage and implement testing.

9 . The system for testing high-voltage ride-through of a photovoltaic inverter according to claim 8 , wherein the inverter test device comprises the passive circuit, the BTB circuit and the circuit breakers;

one end of the inverter test device is connected to an alternating current power supply, and the other end of the inverter test device is connected to a tested apparatus;

the passive circuit comprises a current limiting reactor, a short-circuit capacitor and a resistor with a fixed parameter, and overshooting at voltage recovery is suppressed by means of the resistor with a fixed parameter;

the BTB circuit uses a topology structure of alternating current-direct current-alternating current, one side of the BTB circuit is connected to the passive circuit, and the other side of the BTB circuit is connected to the alternating current power supply; and

the bypass-circuit breaker S 1 is connected to the current limiting reactor in parallel, and the short-circuit breaker S 2 is connected to the short-circuit capacitor in series.

10 . The system for testing high-voltage ride-through of a photovoltaic inverters according to claim 9 , wherein

the BTB circuit runs in two ways of a voltage source and a current source.